Entries |
Document | Title | Date |
20080207365 | Hydraulic tensioner - In the check valve of a hydraulic tensioner, a bell-shaped retainer is provided with plural, branched, leg portions which resiliently grip the outer surface of a ball seat. Oil induction slots are formed between adjacent branched leg portions of the retainer to provide oil flow paths that are unimpeded by the plunger-biasing spring of the tensioner. | 08-28-2008 |
20080207366 | TENSIONER - To reduce seizing in a tensioner having a plunger slidable in a plunger-accommodating hole of a tensioner housing and biased in the projecting direction, the tensioner housing is formed of a hyper-eutectic Al—Si series alloy containing Si in the range from 14 to 16 weight % and having a particle diameter of proeutectic Si in the range from 20 to 30 μm. | 08-28-2008 |
20080220918 | Downward angle settable hydraulic tensioner - The hollow plunger of a hydraulic tensioner for an engine timing chain protrudes from a tensioner housing in an oblique downward direction. An inner sleeve fixed to the housing slidably protrudes into the interior of the plunger, and has a ball check valve at its protruding end. Oil is supplied though the sleeve and the check valve to a high pressure oil chamber formed inside the plunger, and flows outward through a two-part leakage path formed by a gap between the sleeve and the interior of the plunger and a gap between the exterior of the plunger and an interior wall of a plunger-accommodating hole in the housing. Any air that enters the tensioner accumulates in a region surrounding the upper end of the sleeve, rather than in the high oil pressure chamber inside the plunger. | 09-11-2008 |
20080248906 | Tensioning System - Hydraulic tensioning system for a flexible drive, in which a longitudinally displaceable piston guided in a housing is subjected to the force of a hydraulic fluid. For this purpose, the hydraulic fluid passes via a feed bore into a supply chamber of the housing. A portion of the hydraulic fluid is diverted via an injection nozzle of the housing for the purpose of acting on the flexible drive element. | 10-09-2008 |
20080261736 | Chain tensioner - A stepped set groove having shallow and deep portions is formed in the inner periphery of a cylinder chamber formed in a housing of a chain tensioner near its open end. A radially and elastically deformable set ring having circumferentially separated ends is received in the set groove in a radially compressed state. The set ring has at the respective ends thereof a pair of grip portions which are received in a cutout formed in housing at its front end. By engaging the set ring in an engaging groove formed in the outer periphery of the plunger near its front end and the shallow portion, it is possible to keep the plunger pushed into the cylinder chamber. In this state, the chain tensioner is mounted in position. One of the grip portions is brought into abutment with one of the circumferentially opposed end walls of the cutout to prevent the plunger from rotating about its axis in such a direction that the axial gap between an internal thread of the plunger and an external thread of a screw rod inserted in the plunger disappears. Thus, it is possible to keep the axial gap larger than the axial distance by which the plunger has to be moved to move the set ring from the shallow portion into the deep portion. This makes it possible to disengage the set ring from the engaging groove by pushing the plunger into the cylinder chamber. | 10-23-2008 |
20080261737 | Hydraulic tensioner - A check valve unit in a hydraulic tensioner comprises a check ball, a steel ball guide having an inner wall allowing a limited range of longitudinal movement of the ball but restricting its lateral movement, a steel retainer attached to the high pressure oil chamber side of the ball guide, and a steel ball seat attached to the oil supply side of the ball guide. Bulged portions formed on an outer surface of the ball guide are press-fit into the plunger-accommodating hole of the tensioner. | 10-23-2008 |
20080280711 | Chain Tensioner - A chain tensioner is provided which can prevent separation of the plunger. | 11-13-2008 |
20080280712 | Chain tensioner - A chain tensioner includes a housing defining a cylinder chamber. A plunger is mounted in the cylinder chamber so as to be slidable along an inner surface of the cylinder chamber. A return spring is mounted in the cylinder chamber to bias the plunger outwardly. The housing is formed with an oil supply passage communicating with a pressure chamber defined in the housing behind the plunger. A check valve is disposed at an oil exit of the oil supply passage and configured to close the oil supply passage when the pressure in the pressure chamber is higher than the pressure in the oil supply passage. The housing is formed with a threaded hole extending from an upper portion of an outer periphery of the housing to the pressure chamber. A screw has its external thread in threaded engagement with the internal thread of the threaded hole, whereby a gap, as an air bleed passage, is defined between the internal and external threads. The internal thread of the threaded hole has an internal diameter larger than an internal diameter of an internal thread under JIS. | 11-13-2008 |
20080287232 | Hydraulic Tensioning System - A hydraulic tensioning system ( | 11-20-2008 |
20080293526 | Hydraulic Tensioner with a Band Type Check Valve - A hydraulic tensioner is described. The hydraulic tensioner hasincludes an inlet portion which defines a pressurized fluid inlet. The hydraulic tensioner also hasincludes a housing defining a chamber which is coupled to the inlet portion. A band check valve separates the pressurized fluid inlet from the chamber, and a piston slideably engages the housing. An automobile having a driving shaft and a driven shaft may include such a hydraulic tensioner. A method of manufacturing athe hydraulic tensioner is also disclosed. | 11-27-2008 |
20080318716 | Tensioning Device Pertaining to a Traction Mechanism Drive - A tensioning device for a traction mechanism drive. The tensioning device includes a tensioning piston which is mounted in an axially movable manner and provided with an attachment shaft facing the traction mechanism. The tensioning device also includes a tensioning shoe formed of a polymer plastic and mounted on the attachment shaft via a support hole, and a disk-shaped metallic support element which is fixed to the attachment shaft via its support hole. The force transmission between the tensioning shoe ( | 12-25-2008 |
20080318717 | HYDRAULIC TENSIONER - A hydraulic tensioner comprises a plunger, and a plunger-accommodating hole in a tensioner housing, together forming a high pressure oil chamber. A plunger-biasing spring is provided in the high pressure oil chamber between the plunger and the bottom of the plunger-accommodating hole. An oil storage chamber is formed inside the plunger, and a check valve unit is press-fit in the rear end of the plunger to allow flow from the oil storage chamber to the high pressure oil chamber while blocking reverse flow of oil. | 12-25-2008 |
20080318718 | DOWNWARD ANGLE SETTABLE HYDRAULIC TENSIONER - In a hydraulic chain tensioner having a housing, a hollow plunger slidable in a plunger-accommodating hole in the housing, and a hollow sleeve extending into the plunger from a bottom of the plunger-accommodating hole, and a check valve mounted at the opposite end of the sleeve, a passage is provided on the outer surface of the sleeve to accelerate the balance of pressure between a first high pressure chamber between the check valve and the protruding end of the plunger and a second high pressure chamber between the inner end of the plunger and the bottom of the plunger-accommodating hole. In an alternative embodiment, balance is accelerated by communication between the second high pressure chamber and an oil reservoir inside the sleeve on the upstream side of the check valve. | 12-25-2008 |
20090111627 | TENSIONER WITH AN ADJUSTER - The present invention relates to a tensioner, in particular a tensioner for a driving chain of an internal combustion engine, comprising a tensioning plunger which is axially movably guided in a plunger bore of a plunger reception means and an adjuster for readjusting the shift of the operating range of the tensioning plunger caused by wear. The adjuster comprises a hydraulic adjusting element and a closable pressure chamber provided on the bottom of the plunger bore. The adjusting element delimits the pressure chamber against the plunger bore and is axially movably guided in said plunger bore. | 04-30-2009 |
20090111628 | TENSIONER FOR A CHAIN OR BELT - The chain tensioner has a housing with a first part that defines a bore which receives a second part that is tubular. The second part has a bore which receives a plunger. A check valve is disposed in the housing for controlling the delivery of a hydraulic fluid into the bore of the housing. A fluid passage is defined between the first and second part as a helical groove on the outside of the second part. The passage has an inlet for communication with a source of hydraulic fluid provided from, for example, an engine pump and an outlet that is in fluid communication with the check valve. The arrangement enables the check valve to be offset from the point where fluid is supplied to the tensioner thereby enabling the tensioner to be designed in a more compact configuration. | 04-30-2009 |
20090124441 | HOUSING OF A TENSIONING SYSTEM WITH AN INTERGRATED SPRAY NOZZLE - The invention relates to a tensioning system ( | 05-14-2009 |
20090170647 | HYDRAULIC TENSIONER - The present invention is directed to varying the oil pressure in the chamber of a hydraulic tensioner at multi-stages and to preventing an increase of the chain friction at various driving conditions. A hydraulic tensioner ( | 07-02-2009 |
20090186725 | MULTI-UTILITY CAMSHAFT CAP FOR INTERNAL COMBUSTION ENGINE - A multi-utility camshaft cap for an internal combustion engine includes a base for attaching the camshaft cap to a cylinder head of an engine, with the base including not only semicircular bearing sections for mounting one or more camshafts to the cylinder head, but also oil control valves for controlling camshaft phasing, and a camshaft chain tensioner, with each component being mounted within a single, one-piece housing. | 07-23-2009 |
20090186726 | BELTED ALTERNATOR STARTER ACCESSORY DRIVE TENSIONING SYSTEM - An accessory drive tensioning system for a belt coupled to an engine may include a first tensioner, a second tensioner, and a tensioner body. The first and second tensioners may be engaged with the belt. The tensioner body may have a first piston and a second piston that bias the first and second tensioners toward the belt. | 07-23-2009 |
20090197720 | CHAIN TENSIONER WITH COVER ELEMENT - The present invention relates to a tensioning device for an endless drive element, in particular a timing chain of an internal combustion engine, comprising a tensioning rail which is adapted to be operatively connected to the endless drive element, and a tensioning piston which is supported in a housing in an axially displaceable manner and which presses against the tensioning rail, wherein an end face of said tensioning piston is adapted to be connected to a cap element extending beyond the tensioning piston and forming a pressure face which is in engagement with the tensioning rail. | 08-06-2009 |
20090197721 | TENSIONER FOR ENDLESS TRANSMISSION BELT - A tensioner for an endless transmission belt includes a plunger body and a plunger. The plunger is movably provided in the plunger body to press the endless transmission belt. A pressure chamber provided between the plunger and the plunger body is configured to store hydraulic oil supplied from an oil pump. A check valve is provided in the plunger body, configured to be opened to supply the hydraulic oil to the pressure chamber when a pressure in the pressure chamber is lower than an oil pressure from the oil pump, and configured to be closed when the pressure is higher than the oil pressure. A relief valve is provided in the plunger body within a width of the plunger in a direction orthogonal to a longitudinal direction of the plunger and configured to discharge the hydraulic oil in the pressure chamber when the pressure exceeds a predetermined value. | 08-06-2009 |
20090197722 | TENSIONER FOR ENDLESS TRANSMISSION BELT AND INTERNAL COMBUSTION ENGINE HAVING THE TENSIONER - A tensioner for an endless transmission belt includes a plunger body. A plunger is movably provided in a hole of the plunger body to press the belt. A chamber is provided between the plunger and the plunger body to store hydraulic oil. An oil supply passage is provided in the plunger body to supply the oil from an oil pump to the chamber. A check valve is provided between the chamber and the passage and configured to allow the oil to be supplied from the pump to the chamber while the check valve is configured to be closed when a pressure in the chamber is higher than a pressure of the oil supplied by the pump. A relief valve is provided between the chamber and the passage and configured to discharge the oil in the chamber to the passage when the pressure in the chamber exceeds a first predetermined value. | 08-06-2009 |
20090197723 | TENSIONING RAIL FOR A CHAIN DRIVE WITH A BRIDGING GUIDE CHANNEL SECTION AS A PRESSING REGION - The invention relates to a tensioning rail for a chain drive with a support body which is pivotable about a centre of rotation and which has a guide channel, which can be placed in contact with a chain, and a pressing region which can be acted on with pressure by a tensioning piston, wherein the pressing region bridges the guide channel at least in regions by forming a peripherally closed guide channel section, wherein the pressing region is formed in one piece with the support body. | 08-06-2009 |
20090209376 | HYDRAULIC TENSIONER - In a hydraulic tensioner, at least a part of a bar is located within a coil spring that biases a plunger in the protruding direction. The bar reduces the volume of the high pressure oil chamber of the tensioner. | 08-20-2009 |
20090209377 | HYDRAULIC TENSIONER - In a hydraulic tensioner having a coiled plunger-biasing spring, the volume of the high pressure oil chamber is reduced by incorporating a bar inside the spring. One of both ends of the spring are formed to block passage of the bar, so that the bar and spring can be installed as a pre-assembled unit, and dropping of the bar out of the spring can be avoided. | 08-20-2009 |
20090209378 | HYDRAULIC TENSIONER - The hollow plunger of a hydraulic tensioner, slidably receives a sleeve that divides the high pressure oil chamber into two parts. The first part is formed by the plunger and a plunger-accommodating hole of the tensioner housing. The second part is formed by the plunger and the sleeve. Two springs, one being in the first part, and the other being in the second part, urge the plunger in the protruding direction. When the second part is filled with oil during ordinary engine operation, a negative pressure in the second part exerts a force opposing protruding movement of the plunger. Therefore, the springs can be made strong enough to prevent excessive chain vibration and noise during engine start-up when the parts of the high pressure oil chamber are not filled with oil, without causing the tensioner to exert excessive force on the chain during ordinary engine operation. | 08-20-2009 |
20090247335 | HYDRAULIC TENSIONER - In a hydraulic tensioner having a hollow plunger that cooperates with a housing to form a high pressure oil chamber, the movable element of the check valve that allows oil to flow into the high pressure oil chamber is a bar-like element that extends into a coiled plunger-biasing spring and is biased into engagement with a valve seat by another coiled valve-biasing spring that extends into the plunger-biasing spring. The bar-like element has a larger diameter portion the diameter of which is slightly less than the inner diameter of the plunger-biasing spring, and a smaller diameter portion the diameter of which is slightly less than the inner diameter of the valve-biasing spring. The valve-biasing spring bears against a shoulder at the location at which the smaller and larger-diameter portions of the bar-like element meet. | 10-01-2009 |
20090247336 | HYDRAULIC AUTO-TENSIONER WITH DOUBLE SEAL RING - The present invention relates to a hydraulic auto-tensioner, in particular for a chain drive of an internal combustion engine, comprising a housing, a tensioning plunger guided in a plunger bore of said housing, a free piston guided in said plunger bore, and a plunger rod formed on said tensioning plunger and extending through the free piston. The tensioning plunger, the housing and the free piston delimit a hydraulic reservoir which is sealed with respect to the housing and the plunger rod by means of a sealing unit that is arranged on the free piston. The sealing unit is implemented as a double seal ring with an outer sealing surface which is in sliding contact with the plunger bore of the housing, and an inner sealing surface which is in sliding contact with the plunger rod of the tensioning plunger. In addition, the present invention relates to the use of such a double seal ring in a hydraulic auto-tensioner. | 10-01-2009 |
20090298628 | Hydraulic Auto-Tensioner - A hydraulic auto-tensioner includes a high-pressure oil chamber and a low-pressure oil chamber, and oil (L) in the high-pressure oil chamber passes through a clearance (G) between a cylinder ( | 12-03-2009 |
20090325749 | ROTATIONAL ONE WAY CLUTCH CHAIN TENSIONER WITH FRICTIONAL DAMPING - A tensioner for a power transmission system includes two tensioning arms operatively engaged with a strand of either the chain or the belt of the power transmission system. The upper end of each tensioning arm is connected to a one way rotational clutch which is pivotally mounted between the upper ends of the tensioning arms. The one way clutch rotates in one direction in response to changing chain loads to adjust the tension substantially equally on both strands at the same time. In order to prevent over-tensioning, a damping means is included in the one-way clutch. When a pre-determined overload threshold is reached, the amount of torque required to overcome the coefficient of friction of a spring in the damper allows the one way clutch to slip in the direction opposite from its normal rotational direction, thereby relieving the overload condition on the chain. | 12-31-2009 |
20100004080 | PRESSURE RELIEF VALVE FOR A HYDRAULIC TENSIONER - The relief valve uses a slotted Belleville spring preloaded in a cage. The center area of the spring is closed and presses a hole in the bottom wall of the cage. The top wall of the cage is open and has a ledge against which the radial end of the spring presses. The relief valve is used in a hydraulic tensioner and positioned in the tensioner to have the bottom wall form a wall of the pressure chamber. When the pressure in the pressure chamber exceeds the pressure of the spring against the hole, fluid leaks out of the hole. | 01-07-2010 |
20100016105 | CHAIN TENSIONER - A chain tensioner has a plunger ( | 01-21-2010 |
20100029424 | CHECK VALVE WITH SPRING RETAINED BALL - A portion of a bore of a hydraulic tensioner is used as a check valve seat for a check ball and an end of the plunger biasing spring received in the bore of the hydraulic tensioner has a tang with a length extending in from an outer diameter of the spring, to limit and retain the travel of a check ball from the check valve seat when the pressure of an external source is not greater than the pressure in a fluid chamber formed between the bore of the housing and the plunger. | 02-04-2010 |
20100035712 | ATTACHMENT ARRANGEMENT FOR A TRACTION MECHANISM TENSIONER - An attachment arrangement ( | 02-11-2010 |
20100048334 | HYDRAULIC TENSIONING UNIT FOR FLEXIBLE DRIVES - A hydraulic tensioner intended for use in chain drives of internal combustion engines. The hydraulic tensioner has a pot-shaped housing in which a piston is elastically suspended against a traction element and guided for longitudinal displacement. A damping device forms a leak gap which serves to damp adjusting movements of the piston. The leak gap is defined by a bushing which is inserted into the housing and, at the same time, guides the piston. During an adjusting movement of the piston towards a pressure chamber filled with a hydraulic fluid, a fractional quantity of the hydraulic fluid is displaced via the leak gap. An adjusting movement of the piston in the opposite direction causes a re-flow of the hydraulic fluid via a one-way valve arranged in the housing. | 02-25-2010 |
20100062886 | OIL FEED TYPE AUTO-TENSIONER - An object is to provide an oil feed type auto-tensioner which can reliably prevent air from mixing into hydraulic oil in the pressure chamber. | 03-11-2010 |
20100075789 | PIVOT ARM TENSIONER WITH SLIDING RATCHET MECHANISM - An engine chain or belt tensioning system includes a tensioner pivot arm with a ratcheting means that includes backlash in an engine timing system. The tensioner system includes a tensioner pivot arm having a fixed pin, radially projecting ratchet teeth, a tensioner pivot arm biasing device, and a ratchet mechanism that engages the radially projecting ratchet teeth. The ratchet mechanism is oriented such that the tensioner pivot arm freely rotates in one direction, but backdrive is limited in the opposite direction. | 03-25-2010 |
20100075790 | HYDRAULIC TENSIONING ELEMENT FOR A TRACTION MECHANISM DRIVE - A hydraulic tensioning element for a traction mechanism drive, having a cylinder, an axially displaceable piston guided in the cylinder, a spring element disposed between the cylinder and piston, a pressure chamber formed in the cylinder, a supply chamber for a hydraulic fluid, the chamber being formed in the piston, and a valve enabling an exchange of the hydraulic fluid between the pressure chamber and the supply chamber as a function of an actuating motion of the piston. The cylinder has a seal disposed in the housing in a stationary manner, a guide ring is provided between the piston and cylinder, and an annular chamber defined by the guide ring, the inside of the cylinder and the outside of the piston, is connected to the supply chamber in the piston via at least one fluid duct. | 03-25-2010 |
20100087284 | AUTO-TENSIONER - An auto-tensioner includes a cylinder, and a sleeve having a bottom and fitted in the cylinder. Hydraulic oil is stored in the cylinder. A plunger is slidably inserted in the sleeve, thereby partitioning the interior of the housing into a pressure chamber and a reservoir chamber. The pressure chamber communicates with the reservoir chamber through an oil passage. A check valve is provided at the oil passage that permits only the flow of hydraulic oil from the reservoir chamber into the pressure chamber through the oil passage. The check valve includes a ceramic ball configured to move into contact with and separate from a seating surface formed on the end of the oil passage facing the pressure chamber, and a retainer for restricting the moving range of the ceramic material. The ceramic ball has a surface roughness Ra of not more than 0.01. | 04-08-2010 |
20100087285 | CHAIN TENSIONER - A chain tensioner includes a cylinder inserted in a tensioner mounting hole of an engine cover and having a flange fixed to the outer surface of the engine cover. A plunger is axially slidably mounted in the cylinder. The cylinder is formed with an oil supply passage through which hydraulic oil is introduced into a pressure chamber defined by the cylinder and the plunger. The oil supply passage includes a first hole portion extending inwardly from a mating surface of the flange facing the engine cover, and a second hole portion extending from the outer periphery of the flange to the pressure chamber and intersecting the first hole portion. An externally threaded portion of an externally threaded member is in threaded engagement with an internal thread formed on the second hole portion, thereby closing its outer open end. The externally threaded member is fixed in position with an adhesive applied to its externally threaded portion. | 04-08-2010 |
20100087286 | PNEUMATIC BASE FOR FACILITATING THE INSTALLATION AND TENSIONING OF A DRIVE BELT - A belt tensioner comprises a belt trained on a drive pulley driven by a drive unit mounted on a base supported on an air-spring bellows linearly extendable under fluid pressure from a collapsed position to an extended position to cause joint movement of the base, the drive unit and the drive pulley and thereby change the tension in the belt. A pressure regulator is operatively connected to the air-spring bellows for regulating the fluid pressure in the air-spring bellows such as to maintain the tension substantially constant in the belt during use. | 04-08-2010 |
20100093474 | CHAIN TENSIONER - A chain tensioner includes a housing and a plunger slidably mounted in the housing. A ring receiving groove is formed in the inner periphery of the housing in which a register ring is received. The register ring is engageable in any of a plurality of circumferential grooves formed in the outer periphery of the plunger at equal axial intervals. When the plunger is pushed into the housing, the register ring is trapped between a stopper surface of the ring receiving groove and an engaging surface of one of the circumferential grooves, thereby preventing further retraction of the plunger. The register ring includes a ring portion received in the ring receiving groove and having circumferentially spaced ends, and a pair of operating pieces formed by bending the opposed ends of the ring portion to extending in the same axial direction. | 04-15-2010 |
20100099528 | HYDRAULIC TENSIONING ELEMENT FOR A TRACTION MECHANISM DRIVE - A hydraulic tensioning element for a traction mechanism drive having a cylinder, having an axially movable piston which is guided in the cylinder, a spring element which is arranged between the cylinder and the piston, a pressure space which is formed in the cylinder, and a reservoir, which is formed in the piston, for hydraulic fluid. A valve permits an exchange of the hydraulic fluid between the pressure space and the reservoir as a function of an actuating movement of the piston. The cylinder ( | 04-22-2010 |
20100099529 | CHAIN TENSIONER - A chain tensioner includes a cylinder having a closed end, a plunger axially slidably inserted in the cylinder and having an internal thread on the inner periphery thereof, a return spring biasing the plunger in the protruding direction from the cylinder, and a screw rod having an external thread that is in threaded engagement with the internal thread of the plunger. The portion of the screw rod protruding from the plunger abuts a rod seat provided in the cylinder. The external thread of the screw rod is formed by rolling. The screw rod has an intermediate portion protruding from the plunger and having an outer diameter smaller than the diameter of the root of the external thread. A contact surface contact surface of the screw rod to be brought into contact with the rod seat is formed on the axial end face of the intermediate portion by forging. The internal thread may be formed by pressing, and a pressed recess may be formed on the outer circumference of the plunger, corresponding to the internal thread. | 04-22-2010 |
20100105506 | HYDRAULIC TENSIONER FOR A POWER TRANSMISSION MEMBER HAVING TWO MODES OF OPERATION - The invention provides a linear hydraulic tensioner for a power transmission member having a first mode of operation with high forces and a second mode of operation with lower forces corresponding to continuous operation, wherein the tensioner comprises:
| 04-29-2010 |
20100113198 | TENSIONING DEVICE PERTAINING TO A TRACTION MECHANISM DRIVE - A tensioning device for a traction mechanism drive. The tensioning device includes a tensioning piston which is mounted in an axially movable manner and provided with an attachment shaft facing the traction mechanism. The tensioning device also includes a tensioning shoe formed of a polymer plastic and mounted on the attachment shaft via a support hole, and a disk-shaped metallic support element which is fixed to the attachment shaft via its support hole. The force transmission between the tensioning shoe ( | 05-06-2010 |
20100120564 | HYDRAULIC BELT TENSIONER COMPRISING A SPECIAL PISTON - A hydraulic belt tensioner for a unit drive or control drive of a motor vehicle. The belt tensioner has a cylinder housing in which a damper piston with a piston rod is arranged to be axially retracted against the force of a compression spring. A damping valve is integrated into the damper piston which, when interacting with a pressure compartment in the cylinder housing, are a component of a hydraulic damping system that is effective in the direction of retraction of the piston rod. The damping piston is produced from a shaped metal sheet piece that is guided inside the cylinder housing with very little play. The interior of the damping piston forms a receptacle for the damping valve configured as a throttle-check valve. | 05-13-2010 |
20100130320 | CHAIN TENSIONER - A chain tensioner includes a cylindrical cylinder having a closed end, a plunger slidably mounted in the cylinder, and a return spring biasing the plunger. The cylinder is formed with an oil supply passage through which hydraulic oil is introduced into a pressure chamber defined by the plunger and the cylinder. The oil supply passage has an orifice at its end portion facing the pressure chamber. A leak gap is defined between sliding surfaces of the plunger and the cylinder. A damper force is produced by viscous resistance of hydraulic oil flowing from the pressure chamber through the leak gap, and by viscous resistance of hydraulic oil flowing from the pressure chamber into the oil supply passage through the orifice. | 05-27-2010 |
20100137083 | VEHICLE MACHINE CONTROLLED BELT TENSION SYSTEM AND METHOD TO CONTROL BELT TENSION - A vehicle machine with a belt system and a belt. The belt system includes a tensioner with a tensioner moving member which is movably supported on a tensioner stationary member; a tensioner pulley which is rotatably supported on the tensioner moving member and around which at least a portion of the belt is engaged. The belt system includes a bias member, the bias member biasing the tensioner moving member with the tensioner pulley pressing the belt. The belt system includes a controllable electrical current supply and an electromagnetic brake lock, the electromagnetic brake lock including a brake lock electromagnetic coil and a brake lock magnetic target, the electromagnetic brake lock disposed between the tensioner moving member and the tensioner stationary member wherein a controlled current supplied from the controllable electrical current supply to the brake lock electromagnetic coil inhibits the tensioner moving member from moving relative to the tensioner stationary member. | 06-03-2010 |
20100173735 | HYDRAULIC TENSIONER WITH OVERTRAVEL LIMITER - A hydraulic tensioner for a drive system, including a flexible, inextensible drive element, has a bi-directional travel limiter associated with a hydraulically biased tensioning cylinder. The travel limiter is bi-directional because it limits not only loading of the tensioning cylinder against a tensioner shoe in a direction tending to tighten a drive element, but also resists movement of the tensioner shoe in a direction tending to allow slack in a drive element. | 07-08-2010 |
20100197431 | CHAIN TENSIONER - A chain tensioner ( | 08-05-2010 |
20100222167 | MODULAR HYDRAULIC TENSIONER WITH RATCHET - A modular tensioner system for an engine including a modular tensioner and an application specific carrier ( | 09-02-2010 |
20100222168 | CHAIN TENSIONER - A chain tensioner is provided of which the plunger can be easily machined. | 09-02-2010 |
20100267503 | HYDRAULIC TENSIONING ELEMENT FOR A TRACTION MECHANISM DRIVE - A hydraulic tensioning element for a traction mechanism drive, which has a cylinder, an axially movable piston guided in the cylinder, a spring element disposed between the cylinder and the piston, a pressure chamber configured in the cylinder, a storage chamber configured in the piston for a hydraulic fluid, and a valve enabling an exchange of the hydraulic fluid between the pressure chamber and the storage chamber as a function of an actuating movement of the piston. The piston and the cylinder are configured such that the damping generated by the piston movement is substantially independent of the temperature. | 10-21-2010 |
20100285911 | AUTOMATIC BELT TENSIONING DEVICE - An automatic belt tensioning device for use with a belt-driven transmission system, the belt-driven transmission system being designed to transmit power from a power generating device to work performing machinery by use of one or more flexible, continuous loop belts, with the one or more belts mechanically linking two or more rotatable shafts, each shaft having one or more sheaves capable of engaging with the belts, whereby at least one shaft is integrated with the power generating device and at least one shaft is integrated with the work performing machinery, said automatic belt tensioning device having an air spring interposed between the power generating device and the work performing machinery capable of moving the power generating device away from the work performing machinery during operation, such movement dynamically increasing the distance between the power generating device and the work performing motor such that appropriate tension is maintained in the one or more belts notwithstanding any slackening of the one or more belts during operation. | 11-11-2010 |
20100292036 | TENSIONING DEVICE FOR THE TRACTION MECHANISM DRIVE IN A TIMING SYSTEM ON A MOTOR VEHICLE - A tensioning device for the endless drive in a timing system on a motor vehicle, which has a tensioning piston that can move along a path axis in a housing, within which a pressure chamber is located which houses a working medium which brings about a movement of the tensioning piston in the housing and has a valve seat, connected to the exterior of the tensioning piston by an outlet and accommodating a valve body essentially matching the shape of the valve seat. The valve body is tapered along the axial path axis to the outlet, which allows for a large chamber between the valve body and the valve seat. The path that the working medium, on bleeding gas bubbles from the same, takes from the pressure chamber to the outlet is longer, which increases the hydraulic resistance and restricts and limits emptying of working medium from the tensioning piston. | 11-18-2010 |
20100298077 | RATCHET-TYPE TENSIONER - In a ratchet-type tensioner, a rocking ratchet pawl is released from a rack of teeth on a tensioner plunger following engine start-up by a hydraulically operated pin slidable in a pin hole and caused to protrude therefrom by oil under pressure received directly from an external oil supply, or alternatively from the tensioner's high pressure oil chamber through a passage in the tensioner housing. Optionally, an orifice can be provided within the pin hole to control flow of oil when the supply is excessive and to avoid leakage when the supply is insufficient. | 11-25-2010 |
20100298078 | RATCHET-TYPE TENSIONER - In a ratchet tensioner, a linearly moving ratchet for engagement with rack teeth on a plunger is operated a piston that is spring-biased in a direction to engage the ratchet teeth with the rack, and movable by oil pressure in a direction to disengage the ratchet teeth from the rack. The piston is located within a hole in the housing and, with that hole, forms a second high pressure oil chamber that can receive oil through an oil supply path independent of the oil supply path that carries oil to a first high pressure oil chamber formed by the plunger and the tensioner housing. | 11-25-2010 |
20110003657 | CHAIN TENSIONER - A chain tensioner for use on a chain drive system is disclosed which has a housing open at both ends. Into the housing, a cartridge is inserted, the cartridge having including a body with a cylinder within and a piston. A retention system is provided to substantially prevent the body of the cartridge from moving with respect to the housing. Such a retention system, in one embodiment, includes a lip at a first end of the body and a groove on a second end of the body. The lip serves as a stop to prevent the body of the cartridge from moving axially beyond the stop in one direction. A clip is interlocked into the groove on the second end of the body of the cartridge to prevent movement in the opposite direction. | 01-06-2011 |
20110015013 | HYDRAULIC TENSIONING SYSTEM COMPRISING INTEGRATED OVERPRESSURE VALVE - A hydraulic tensioning system ( | 01-20-2011 |
20110015014 | MODULE FOR A TENSIONING ELEMENT MEANS DRIVE CONCEPT - A tensioning system ( | 01-20-2011 |
20110021298 | CHAIN TENSIONER - In a chain tensioner, an expansible ring is disposed in an internal groove formed in the inner wall of a plunger-accommodating hole near an open end thereof. The ring cooperates with grooves formed on the plunger to exert a ratchet action. The relationship between the angles of the surfaces of the internal groove and the grooves on the plunger allows the plunger to protrude, restricts retraction of the plunger on start-up of a chain transmission, but allows retraction when chain tension becomes excessive. In one embodiment, in which the ring is a C-ring, the tensioner housing can be formed with external threads for mounting in a threaded hole on a timing chain cover or other engine part. In other embodiments, the ring can have externally protruding levers for manipulation of the ring. | 01-27-2011 |
20110081997 | RATCHETING TENSIONER WITH A SLIDING AND PIVOTING PAWL - A tensioner with a piston is slidably received with a bore ( | 04-07-2011 |
20110081998 | TENSIONING DEVICE - To increase the pressing force on a chain as the chain undergoes greater elongation. Provision is made for: a tensioner arm | 04-07-2011 |
20110098145 | TENSION REGULATOR APPLIED TO A TIMING BELT - A tension regulator employs a first blocking member fixed between a plunger on a propelling member and the blocking device to permit a smooth sliding movement of the propelling member to be achieved via a stable support while the plunger driving the propelling member of the propelling device. Additionally, the reinforced limitation to the sliding movement of the plunger provided by the first blocking member could accordingly prevent the propelling member from an over-protruding incident. Thence, since hydraulic oil is properly blocked by the first blocking member, no leakage of the oil would adversely occur, and no air would unfavorably enter into the sliding space in time of the sliding. Thence, the tension regulator possesses a more stable operation, and a driving safety could be promoted. | 04-28-2011 |
20110152021 | QUICK RELEASE MECHANISM FOR TELESCOPIC CONVEYOR - Disclosed is a release mechanism suitable for releasing and disengaging a chain drive means associated with a drive mechanism for a movable extendable frame assembly. In the arrangement, the drive mechanism includes a drive, a wheel assembly and a drive chain associated with the drive to drive wheels associated with the frame assembly. The mechanism also includes a quick release for permitting the chain drive to be released and disengaged from driving the wheels. The quick release has a movable support mounting the drive, and in which the support is movable about a fixed point to raise and lower the drive from a lower chain tensioned position to an upper chain release position. | 06-23-2011 |
20110152022 | TENSIONER UNIT - A tensioner unit comprises a tensioner body, a gasket in overlapping relationship to the tensioner body whereby the gasket can be sandwiched between the tensioner body and a mounting surface to which the tensioner body is to be secured, and a threaded mounting bolt inserted through a mounting hole in the tensioner body for securing the tensioner body to the mounting surface. A bolt hole is provided in the gasket, and the mounting bolt also extends through the bolt hole. The gasket grips the bolt and holds the mounting bolt, the gasket, and the tensioner body, in fixed relationship to one another, and maintains the gasket in a predetermined aligned relationship with the tensioner body when the gasket is in overlapping relationship with the tensioner body during mounting of the tensioner body on the mounting surface. | 06-23-2011 |
20110183796 | RATCHET-TYPE TENSIONER - In a ratchet-type tensioner having a toothed ratchet piston biased toward a rack of teeth formed on a protruding plunger in a direction transverse to the direction of plunger movement, the rack teeth and the ratchet teeth are mutually engageable and inclined at angles such that the biasing force urging the teeth of the ratchet piston into engagement with the rack teeth is sufficient to block retraction of the plunger during engine start-up but can be overcome when chain tension becomes excessive during engine operation following engine start-up. | 07-28-2011 |
20110207567 | LINEARLY ACTING TENSIONING ELEMENT - A tensioning element of a traction drive, which has a cylindrical housing. In the housing a piston is guided in a linearly displaceable manner. In order to fasten the tensioning element (1), the housing and the piston correspondingly enclose a respective coupling point. Furthermore, a spring means, which at least in regions surrounds a guide sleeve, is arranged between the components made from plastic. The piston is guided in a linearly displaceable manner in the cylinder by a plain bearing bush. For the purpose of positional orientation and for limiting the stroke, a pin, which is inserted in the piston, engages in a longitudinal slot in the cylinder in a form-fitting manner. | 08-25-2011 |
20110230288 | TENSIONING UNIT FOR A TRACTION-MEANS TENSIONING DEVICE - A tensioning unit ( | 09-22-2011 |
20110237370 | TENSIONING DEVICE FOR AN ENDLESS DRIVE MEANS HAVING A COMBINATION VALVE - A tensioning device for an endless drive which has a housing, in which there is an extendable cylinder. Between the housing and the cylinder there is a pressure chamber that can be filled with a pressure fluid via a supply opening in the housing. A combination valve, which has a nonreturn valve that can be opened in the direction of the pressure chamber, a movable first shutoff element, a pressure relief valve, which can be opened counter to the aforementioned direction and a movable second shutoff element inserted in the supply opening. The first shutoff element of the nonreturn valve is arranged substantially on the pressure-chamber side of the second shutoff element. | 09-29-2011 |
20110251000 | ENDLESS TRACTION MECHANISM TENSIONER - A tensioning device for an endless traction mechanism for a motor is provided and includes a housing ( | 10-13-2011 |
20110251001 | TENSIONER - A tensioner having a simplified structure, using engaging teeth having increased strength and reduced backlash, constructed from a reduced number of parts, reduced in cost, and having increased design freedom. A tensioner comprises: a tubular member ( | 10-13-2011 |
20110256970 | CHAIN TENSIONER - In a hydraulic tensioner, a tensioner housing is provided with an oil outflow channel communicating with a high pressure oil chamber formed by a plunger and the tensioner housing. A control valve in the oil outflow channel can be adjusted manually or automatically to optimize the damping performance of the tensioner in different engines and under different operating conditions, thereby obviating individualized machining of tensioner components to achieve optimum damping. | 10-20-2011 |
20110263366 | HYDRAULIC TENSIONER - A hydraulic tensioner for a traction element drive of an internal combustion engine, is provided having a tensioner housing with a hollow piston located in the housing bore. A check valve is located in the bore along a pressurized fluid path to the hollow piston, and a spring guide located in the housing in proximity to a base of the bore. A tensioning spring extends from the spring guide inside the hollow piston toward the piston head. A pressure relief valve is located within the hollow piston adjacent to the piston head, with the pressure relief valve including a valve body having a flange with a support surface that rests against an inside of the piston head and a hollow spring guide that extends from the flange toward the base of the bore. A valve seat is formed in the hollow spring guide, and a spring is located in the hollow spring guide and biases a valve ball against the valve seat. At least one of the support surface of the flange, the valve seat or the valve ball include surface indentations or irregularities that allow gas venting through the pressure relief valve. | 10-27-2011 |
20110269585 | TENSION REGULATOR WITH A PRESSURE VESSEL APPLIED TO A TIMING BELT - A tension regulator with a pressure vessel applied to a timing belt installs a pressure vessel between a body and a propelling device. By means of a moving space being defined in the pressure vessel, the propelling device could be accommodated and moved therein. Accordingly, the hydraulic oil would not readily escape from the body, and a using safety could be assured. | 11-03-2011 |
20110312454 | TENSIONER WITH MICRO-ADJUSTMENT FEATURE - In one aspect, the invention is directed to a belt tensioner for tensioning a belt, comprising a pivot shaft that is fixedly mountable with respect to an engine block of an engine, a tensioner arm rotatably mounted to the pivot shaft for pivoting about a tensioner arm axis in a first direction and in an opposing second direction, a pulley rotatably mounted to the tensioner arm for rotation about a pulley axis, and a tensioner spring positioned to bias the tensioner arm in the first direction, wherein the tensioner spring has a first end and a second end, wherein the first end is engaged with the tensioner arm, and a micro adjustment mechanism that is operatively connected to control the position of the second end of the tensioner spring so as to control the tension in the tensioner spring. | 12-22-2011 |
20120010033 | Tensioning Device with Pivotable Joint Connection - A tensioning device for an endless drive is provided. The tensioning device comprises a tensioning lever and a tensioning piston. The tensioning lever comprises a connection socket, and the tensioning piston comprises a connection head. A pivotable joint connection is implemented between the tensioning lever and the tensioning piston by means of the connection head. The connection socket defines a reception opening, and at least certain areas of the connection head are, by means of the connection socket and at least one boundary area formed thereon, encompassed in the reception opening in such a way that the connection head is secured against separation from the connection socket in a direction opposite to the direction of operation of the tensioning piston. | 01-12-2012 |
20120040790 | Tensioning Apparatus with Locking Bracket - A tensioning apparatus or device for a flexible driving means, particularly a drive chain for an internal combustion engine, comprises a housing, a tensioning piston movably guided in said housing and an adjusting or regulating means for gradually adjusting the working stroke of the tensioning piston. The adjusting means comprises a locking bracket and an appertaining locking profile at the tensioning piston, two arch-shaped clamping sections of said locking bracket being engageable with said locking profile, and a resilient spring portion with a torsional area combining the clamping sections in spring-resilient manner. In a preferred embodiment, the locking bracket comprises a U-shaped section with a portion angled towards the housing wall and forming the torsional area. The housing is further provided with a guide projection projecting from said housing wall for axially guiding said angled portion of said U-shaped section of said locking bracket in the working stroke of said tensioning piston in torsion-proof manner. | 02-16-2012 |
20120108376 | TENSIONING DEVICE WITH A CYLINDRICAL LATCHING SYSTEM - A tensioning device for an endless traction element in an engine. The tensioning device has a housing, a plunger, which can he moved in the housing, a compression spring arranged in the plunger, a nonreturn valve arranged between the plunger and the housing, a cylinder arranged in the plunger, and an engagement element. The plunger and the cylinder are connected to one another by a latching system via engagement of the engagement element, and the cylinder is connected materially to the nonreturn valve. | 05-03-2012 |
20120122619 | RATCHET-TYPE TENSIONER - In a ratchet tensioner, rack teeth on a plunger are engaged by ratchet teeth on one end of a movable plug that slides in a hole in the tensioner housing along a direction orthogonal of the direction of movement of the plunger. The movable plug is prevented from rotating in the hole in which it slides so that the ratchet teeth engage the rack teeth on the plunger smoothly and reliably. | 05-17-2012 |
20120135831 | Tensioning Device with a Damping Means Comprising a Minimum Capacity - A tensioning device for a flexible drive means, such as a chain or a belt, includes a housing, a tensioning piston movably arranged in the housing and provided with a hollow space, a pressure chamber for hydraulic fluid arranged between the housing and the tensioning piston, a vent opening arranged in the tensioning piston, and a damping means in flow communication with the vent opening and with the pressure chamber. A packing element is arranged in the hollow space of the tensioning piston and is at least a component of the damping means, such that the damping means comprises a capacity for hydraulic fluid which corresponds to at least 30% of the volume of the pressure chamber added in a 1 mm stroke of the tensioning piston in the extension direction. The device relates to a series of tensioning devices as well as a transmission and a series of transmissions. | 05-31-2012 |
20120178563 | Drive Belt System of Hybrid Engine - A drive belt system of a hybrid engine, may include a crankshaft pulley that may be disposed to be rotated by an engine, a hybrid starter generator (HSG) pulley that may be disposed with a distance from the crankshaft pulley and may be coupled to and rotated by a HSG that selectively starts the engine and generates electricity, an idler pulley that may be rotatably disposed at a position with a distance outwards from a first tangential line passing the crankshaft pulley and the, a drive belt that the crankshaft pulley, the and the idler pulley may be wrapped by the interior circumference thereof, a mechanical auto tensioner (MAT) that pushes the drive belt between the crankshaft pulley and the inwards from a second tangential line passing the crankshaft pulley and the to sustain the tension of the drive belt, and a hydraulic auto tensioner that pushes the drive belt between the crankshaft pulley and the idler pulley inwards to sustain the tension. | 07-12-2012 |
20120196709 | RATCHET-TYPE TENSIONER - There is provided a ratchet-type tensioner whose spring stopping washer for seating a ratchet biasing spring is rigidly and readily assembled to a ratchet-receiving hole so as not to fall out of the ratchet-receiving hole and which reduces flapping noise and prevents seizure of the plunger by securely and stably operating a ratchet mechanism in operating an engine. The ratchet-type tensioner | 08-02-2012 |
20120202628 | Controllable Hydraulic Turnbuckle - The invention relates to a controllable hydraulic turnbuckle for a power transmission member having a first mode of operation with increased forces and a second mode of operation with less forces, comprising: first ( | 08-09-2012 |
20120202629 | ACTIVE CONTROL TENSIONER - A tensioner system for an engine including at least one driven sprocket, at least one driving sprocket, a chain, and a tensioner for tensioning the chain. The damping of the tensioner is actively controlled by a valve that allows fluid to exit the tensioner. | 08-09-2012 |
20120225743 | Rachet-Type Tensioner - A ratchet-type tensioner capable of restricting setback of a plunger includes a ratchet mechanism that allows setback of the plunger by sliding a ratchet element in a disengaging direction to disengage ratchet teeth from rack teeth when a reaction force acts on the plunger as a result of excessive chain tension. The ratchet element is slidable in a ratchet-receiving hole, and an inclination suppressing structure that prevents the ratchet element from becoming skewed in the ratchet receiving hole to an extent such that its forward end contacts one side of the hole while its rearward end contacts the opposite sides of the hole. | 09-06-2012 |
20120252615 | HYDRAULIC TENSIONER - A hydraulic tensioner applies appropriate tension to an endless power transmitting belt. The hydraulic tensioner includes a plunger body, an oil supply path, a check valve, a relief valve, a pressure maintaining valve interposed in a relief path and a pressure accommodating hole. The hydraulic tensioner is configured such that a path that is branched from the oil supply path for operating the pressure maintaining valve is formed independently of a supply path to the check valve. | 10-04-2012 |
20120252616 | AIR BLEEDING VALVE FOR HYDRAULIC TENSIONER OF AN ENGINE AND HYDRAULIC TENSIONER INCORPORATING SAME - An air bleeding valve includes an annular valve element for removing air from oil contained in a hydraulic circuit of a hydraulic tensioner and for suppressing the removal of the oil. An air bleeding valve body is fitted in an air bleeding valve accommodating hole formed in the hydraulic tensioner. A circumferential groove having a rectangular cross section is formed on an outer circumferential surface of the air bleeding valve body. The annular valve element having a rectangular cross section is fitted in the circumferential groove so as to be movable in an axial direction parallel to the axis of the annular valve element, and displaceable in a radial direction toward and away from the axis of the annular valve element. Such air bleeding valve removes air in a hydraulic circuit while suppressing the removal of oil in the hydraulic circuit during starting operation of an engine. | 10-04-2012 |
20120309570 | RING-TYPE TENSIONER - In a ring-type tensioner, an expansible elastic ring disposed in a groove formed in the wall of a plunger-accommodating hole cooperates with teeth formed on the plunger to restrict axial movement of the plunger. The ring and the groove in the wall of the plunger-accommodating hole have flat radial surfaces for mutual engagement. However the ring also has oblique plunger-tooth engaging surfaces. The ring has manipulable end parts that can be locked in fixed relation to each other by a tool to secure the plunger against axial movement. The tool can also be inserted into a gap between the manipulable end parts to expand the ring and thereby release the plunger. | 12-06-2012 |
20120322594 | BICYCLE CHAIN TENSIONER DEVICE - A bicycle chain tensioner device is basically provided with a base member, a pulley and an electrical storage unit. The pulley is supported by the base member. The pulley includes a dynamo that generates electrical energy in response to the pulley being rotated by a bicycle chain. The electrical storage unit is disposed on the base member and electrically coupled to the dynamo to store electrical energy generated by the dynamo. | 12-20-2012 |
20120322595 | SEGMENTED RECEIVING HOUSING HOLE, SLIDING CORE, TENSIONING DEVICE AND TRACTION MECHANISM DRIVE - A receiving housing of a hydraulic tensioning device for a traction mechanism drive in an internal combustion engine, having an opening that extends along a longitudinal axis for receiving a piston that is implemented for deflecting a tensioning rail of the traction mechanism drive. The receiving housing is a cast component, and the opening comprises an inner contour having an inner surface that comprises at least first segments and inclines for removing the workpiece from the mold in the opening. The second segments include surfaces that are directed into the inside of the opening and are aligned in parallel with the longitudinal axis. A sliding core is also provided that has an outer contour that is complementary to the inner contour of the opening of the receiving housing and fits into the opening. A traction mechanism drive and tensioning device having a receiving housing of this type are also included. | 12-20-2012 |
20120322596 | CHAIN TENSIONING DEVICE FOR USE IN A MOTOR VEHICLE - A chain tensioning device for use in a motor vehicle with a cylinder-piston unit ( | 12-20-2012 |
20120329590 | HYDRAULIC TENSIONER - In a hydraulic tensioner, the seating surface of a ball-type check valve, used to allow oil to enter the oil chamber of the tensioner while blocking reverse flow of oil, is formed with one or more grooves that allow leakage of oil from the oil chamber to an oil supply passage even when the ball is seated. The groove or grooves can have a decreasing depth or decreasing width, proceeding from the opening of the oil passage of the ball seat toward the oil chamber. Plural grooves can be provided at equal circumferential intervals, and the grooves can be circumferentially inclined. In each case, the groove or grooves improve separation of the ball from the seat, and thereby improve responsiveness of the tensioner to variations in chain tension. | 12-27-2012 |
20130017913 | PRESSURE RELIEF VALVE IN A TENSIONING SYSTEMAANM Hartmann; ChristianAACI NemsdorfAACO DEAAGP Hartmann; Christian Nemsdorf DE - A tensioning system for an internal combustion engine, including a traction mechanism, a rail on which the traction mechanism runs, and a hydraulic tensioning device, the tensioning device having a housing and a piston housing that is movable in the housing and to which pressure is applied by a spring, the housings delimiting a pressure chamber, and having a hydraulic medium supply and a check valve situated in the hydraulic medium supply, as well as a pressure relief valve situated in the piston housing for automatically opening at a pre-specified pressure in the pressure chamber, the pressure relief valve being a constructive unit that can be preassembled, having a valve housing, a valve cover, a valve body, and a valve spring, the valve housing and the valve cover being made of plastic. | 01-17-2013 |
20130109518 | HYDRAULIC TENSIONER | 05-02-2013 |
20130116072 | Electric Cylinder - An electric cylinder has a cylinder housing and a clamping assembly in the cylinder housing. An electric motor assembly is coupled with the clamping assembly to drive the clamping assembly between a first and second position. The electric motor assembly has an electric motor with a rotary output. The clamping assembly has a drive pulley assembly coupled with the rotary output. A lead screw is rotatably coupled with the drive pulley for axial movement. The lead screw moves between the first and second positions. A compliance coupling is positioned between the lead screw and the drive pulley. The compliance coupling is axially movable in the pulley assembly for absorbing shock when the piston assembly encounters a stop. | 05-09-2013 |
20130178317 | Tensioning Device with Damping Channel in the Fluid Supply System - The damping device of the tensioning device has at least one damping channel that is open in both flow directions as a component of the fluid supply in such a way that during operation at least a portion of the supply stream is fed through the at least one damping channel into the pressure reservoir, and the damping device and the venting device are coupled with each other by fluid engineering means such that a drainage flow from the pressure reservoir occurs via the damping device and the venting device in combination, and the supply flow occurs predominantly independently of the venting device. | 07-11-2013 |
20130190116 | MODULAR HYDRAULIC TENSIONER WITH RATCHET - A modular tensioner system for an engine including a modular tensioner and an application specific carrier ( | 07-25-2013 |
20130260930 | HYDRAULIC TENSIONER - In a hydraulic tensioner, a check valve comprises a check ball disposed within a seat/retainer combination in which a ball seat and retainer are formed as a unit and connected by a bend. The check valve is mounted so that it can rotate within the tensioner housing about a center line, and formed so that its center of gravity is offset from the center line. The check valve unit therefore tends to assume a position in which its center of gravity is directly below the center line. Openings that allow flow of oil from the interior of the check valve unit to a hydraulic chamber in the tensioner are positioned so that, when the center of gravity of the check valve unit is directly below the center line, the check ball cannot block or restrict flow through the openings. | 10-03-2013 |
20130260931 | HYDRAULIC AUTO-TENSIONER - A hydraulic auto-tensioner includes a cylinder containing hydraulic oil, a sleeve received in the cylinder, and a rod having its bottom end slidably inserted in the sleeve, defining a pressure chamber in the sleeve. A return spring is mounted between a spring seat provided at the top of the rod and the inner bottom surface of the cylinder to bias the cylinder and the rod such that the rod protrudes from the cylinder. A check valve is provided which closes when the pressure in the pressure chamber exceeds the pressure in the reservoir chamber. The check valve includes a valve seat slidably mounted in a valve fitting hole formed in the sleeve at its bottom end and pressed against an annular seating surface at the top of the valve fitting hole by an elastic member. | 10-03-2013 |
20130288836 | HYDRAULIC TENSIONER - Deaeration of the high pressure oil chamber of a hydraulic tensioner takes place though a helical orifice formed by opposed flanks of the threads of a threaded hole in the tensioner housing and the threads of a screw inserted into the hole. The opposed flanks are maintained in spaced relationship by a force exerted by a spring washer disposed between the head of the screw and a surface of the tensioner housing surrounding the opening of the threaded hole. The flank of the thread of the hole that forms part of the boundary of the helical orifice can have a concave curvature in order to increase the aperture of the air flow path. A groove in the surface surrounding the opening of the threaded hole prevents the washer from sealing off the flow of air. This groove is disposed with its exit end at a level above its entry end. | 10-31-2013 |
20130303318 | TRACTION-MEANS TENSIONING DEVICE HAVING A SECURING ELEMENT, AND INTERNAL COMBUSTION ENGINE HAVING SUCH A TRACTION-MEANS TENSIONING DEVICE - A traction-means tensioning device having a housing that contains aluminum as a material, into which a slide sleeve is inserted axially immovably, within which a hydraulically actuatable, axially extendable piston is supported; a pressure chamber being provided between the piston, which is made of steel, and the slide sleeve, which is made of steel, that can be filled with a hydraulic medium; a securing element engaging on the slide sleeve and the housing to fix the axial position of the slide sleeve relative to the housing, the securing element being provided with an elongate fastening portion that is configured to be fixed in position in the housing and is provided at a housing-distal end with a head that is in form-fitting contact with the slide sleeve. Also, an internal combustion engine having such a traction-means tensioning device and a traction means. | 11-14-2013 |
20130303319 | TRACTION-MECHANISM DRIVE HAVING A TENSIONER AND A CLAMPING ELEMENT - A traction mechanism drive having a hydraulic tensioner ( | 11-14-2013 |
20130310206 | RATCHET-TYPE TENSIONER - In a ratchet-type tensioner having a plunger with rack teeth formed thereon and a piston with ratchet teeth that engage the rack teeth, the ratchet teeth can be disengaged from the rack teeth by insertion of a tool through a tool insertion hole in the tensioner housing and exerting a prying action on the toothed end of the piston to move the piston away from the plunger. Alternatively if an oblique camming surface is formed on the toothed end of the piston, the ratchet teeth can be disengaged from the rack teeth by pushing the tool inward against the oblique camming surface. The piston and the hole in which it slides are shaped to prevent rotation of the piston. The ratchet teeth on the piston and the rack teeth on the plunger can be oblique to allow setback of the plunger when excessive force is exerted on the plunger. | 11-21-2013 |
20130324336 | MODULAR HYDRAULIC TENSIONER WITH RATCHET - A modular tensioner system for an engine including a modular tensioner and an application specific carrier ( | 12-05-2013 |
20130324337 | HYDRAULIC TENSIONER - In a hydraulic tensioner for maintaining tension in a traveling transmission medium in an engine, oil is delivered to an expansible chamber formed by a tensioner housing and a plunger through a reserve chamber composed of an entrance reserve chamber into which oil flows from an oil supply and a supply reserve chamber from which oil flows to the expansible chamber. A partition between the entrance and supply reserve chambers establishes a communication passage that ensures an amount of oil in the supply reserve chamber sufficient to make up the loss of oil due to leakage from the expansible chamber during a long interval while engine is inoperative, and additional leakage from the expansible chamber due to reciprocating movement of the plunger when the engine is started. | 12-05-2013 |
20130331212 | TENSIONER - In a tensioner having a housing and a plunger protruding in an advancing direction from a plunger-accommodating hole formed in the housing. The plunger has a cylindrical outer wall for sliding contact with the wall of the plunger-accommodating hole, and a tapered the rear end wall. A small clearance between the cylindrical outer wall of the plunger and the wall of the plunger-accommodating hole allows the plunger to become inclined by a small amount, which increases as the plunger advances. The angle of the taper at a boundary where the end wall meets the cylindrical outer wall is substantially equal to the maximum inclination of the plunger when the plunger is in its fully advanced condition | 12-12-2013 |
20130331213 | MOTORCYCLE CAMSHAFT DRIVE TENSIONER - A cam drive tensioner for use with an engine includes a main body mounted to a component of the engine; a shoe movably mounted to the main body, for movement in a first direction; and two or more hydraulic chambers defined between the main body and the shoe, with the two or more hydraulic chambers being laterally spaced apart from each other in a second direction generally perpendicular to the first direction. | 12-12-2013 |
20130331214 | VARIABLE FLOW CHECK VALVE FOR HYDRAULIC TENSIONER - A variable flow check valve ( | 12-12-2013 |
20130337954 | Tensioning Device with At Least Two Vent Elements - A tensioning device for a continuous drive element includes a housing, a tensioning piston movably guided in the housing, and a pressure chamber for hydraulic fluid formed between the housing and the tensioning piston, wherein the tensioning piston comprises a vent opening, and a vent channel between the pressure chamber and the vent opening, formed by assembling at least two vent elements, wherein in the one vent element, in the contact surface to the second vent element, separate partial areas of the vent channel are formed by molded groove sections which are connected to each other by transfer grooves molded in the second vent element in the contact surface to the first vent element, such that sections of a main portion of the cross-section of flow of the vent channel are arranged on one side, and sections are arranged on another side of a plane spanned by the contact surfaces. | 12-19-2013 |
20130345002 | TENSIONER FOR A TRACTION DEVICE HAVING AN OVERPRESSURE VALVE WITH A SEALING CAGE, AND TRACTION DEVICE DRIVE HAVING A SUCH TENSIONER - A hydraulic tensioner for a traction device ( | 12-26-2013 |
20140057747 | ADJUSTMENT DEVICE - The present invention provides methods and systems for an adjustment device for allowing the expeditious adjustment of drive belts that includes a frame having at least one channel, a tab extending substantially perpendicularly from the longitudinal axis of the frame, and a boss rotationally disposed on the frame. A support member is disposed adjacent the frame and includes a bore for receiving an adjustment member having a first end and a second end, and the second end of the adjustment member is disposed in close proximity to the tab of the frame. | 02-27-2014 |
20140057748 | HYDRAULIC AUTO-TENSIONER - A hydraulic auto-tensioner includes a cylinder with a sleeve fitting hole, and a sleeve press-fitted therein. A rod has its bottom end slidable in the sleeve. A return spring is mounted between a spring seat at an upper portion of the rod and a bottom surface of the cylinder. An oil passage, with a check valve, is formed between the fitting surfaces of the sleeve fitting hole and the sleeve and communicates the pressure chamber with the reservoir chamber. The rod has a valve fitting hole open to its bottom surface, and an oil passage communicating the valve fitting hole with the reservoir chamber. A relief valve, mounted in the valve fitting hole, includes a valve seat with a valve hole having an orifice for restricting the flow rate of oil released from the pressure chamber into the reservoir chamber through the oil passage when the relief valve opens. | 02-27-2014 |
20140087902 | TENSIONING DEVICE FOR A TRACTION-DEVICE DRIVE - A tensioning device ( | 03-27-2014 |
20140100068 | CHAIN TENSIONER - To provide a chain tensioner that has a simple structure, is universally usable and capable of supplying sufficient and necessary oil when restarted after a long time after the stop of oil supply, and enables reduction of its length and size. Urging unit | 04-10-2014 |
20140106913 | TENSIONER AND SHOE THEREFOR - One embodiment includes a tensioner that includes a housing, a piston, and a shoe. The piston extends from the housing. The shoe is carried by the piston and has a recess. The recess receives a portion or more of the piston. | 04-17-2014 |
20140179471 | CHAIN OR BELT TENSIONER WITH A RATCHET THAT DEACTIVATES - A tensioner comprising a piston slidably received within a piston bore of the housing having a plurality of grooves formed on an outer circumference, the piston forming a first pressure chamber with the piston bore. The tensioner uses a mechanism to remove a sliding pawl or expandable clip from engaging the grooves on the piston, such that the piston can move towards the housing and reduce chain load when fluid pressure is reduced in the first pressure chamber during engine shutdown, but not so much as to leave the chain uncontrolled during engine restart. The mechanism may for example be a fluid biased spool piston which engages the expandable clip or a pawl piston that engages a sliding pawl. | 06-26-2014 |
20140187367 | CHAIN DRIVE TENSIONER SPRING FORCE CONTROL MECHANISM - A tensioner which adjusts the mean tensioner force to keep the chain tension as low as possible without sacrificing chain control, significantly improving drive efficiency as the chain wears and is subject to low dynamic loads. | 07-03-2014 |
20140187368 | CHAIN DRIVE TENSIONER SPRING FORCE CONTROL MECHANISM - A tensioner which adjusts the mean tensioner force to keep the chain tension as low as possible without sacrificing chain control, significantly improving drive efficiency as the chain wears and is subject to low dynamic loads. | 07-03-2014 |
20140187369 | CHAIN DRIVE TENSIONER SPRING FORCE CONTROL MECHANISM - A tensioner which adjusts the mean tensioner force to keep the chain tension as low as possible without sacrificing chain control, significantly improving drive efficiency as the chain wears and is subject to low dynamic loads. | 07-03-2014 |
20140200104 | CHAIN TENSIONER - To provide a chain tensioner that has a simple structure, is universally usable, is capable of supplying sufficient and necessary oil when restarted after a long time after the stop of oil supply, enables reduction in entire length and size, and enables easy production and reduction in production cost. An urging unit | 07-17-2014 |
20140235386 | Tensioning Device - A tensioning device for producing tension in a chain, including a hydraulic tensioner, a tensioner arm, a lever arm and a pin member. The tensioner causes the tensioner arm to pivot at one end. The lever arm is positioned with a part toward the hydraulic tensioner. The pin member is fitted in a fixed wall and also has one end inserted in a hole in part of the lever arm. | 08-21-2014 |
20140256486 | TENSIONING DEVICE WITH SPRING DIAPHRAGM - A tensioning device, in particular for a highly dynamic endless drive, such as a chain drive or a belt drive for an internal combustion engine, comprises a tensioner housing, a tensioning piston displaceably arranged in the tensioner housing, a pressure chamber formed between the tensioner housing and the tensioning piston and a pressure medium inlet leading into the pressure chamber and including a non-return valve. In order to meet also new demands, in the case of which oil pumps with having a low feed pressure are used, the present device discloses that a valve body of the non-return valve is defined by a leaf spring diaphragm. The device additionally relates to a non-return valve as well as an endless drive. | 09-11-2014 |
20140349795 | INTERNAL COMBUSTION ENGINE AND MOTORCYCLE EQUIPPED WITH THE ENGINE - An internal combustion engine includes a cam chain chamber accommodating a cam chain and a chain guide guiding the cam chain. The engine also includes a chain tensioner including a case main body, a plunger sliding in the case main body, a coil spring biasing the chain guide against the cam chain via the plunger, interlocking teeth located on a surface of the plunger, and an engaging portion engaged with the interlocking teeth and configured to inhibit the plunger from moving in a direction away from the chain guide. The engine also includes oil supply passages in an inner wall of the cylinder head and an inner wall of the cylinder body and configured to supply oil to the chain tensioner. | 11-27-2014 |
20140364257 | HYDRAULICALLY RATCHETED CHAIN TENSIONER - A hydraulically ratcheted tensioner is provided. The tensioner includes a tensioner housing and a plunger including a groove is located partially in a piston chamber in the tensioner housing. The plunger is pressurizable by hydraulic fluid. A ratchet device includes a ratchet housing and a piston having an angled end. A spring biases the piston such that the angled end is forced against a ratchet pin that extends radially through a hole in the ratchet housing and the tensioner housing. The ratchet pin is biased against the piston by a ratchet spring. In a first, non-pressurized state, the ratchet pin engages the groove. In a second, pressurized state, the pressurized hydraulic fluid forces the piston against the spring such that the angled end disengages the ratchet pin and the ratchet spring moves the ratchet pin to a position disengaged from the groove, and the hydraulic fluid pressurizes the plunger. | 12-11-2014 |
20140378253 | HYDRAULIC AUTO-TENSIONER - A hydraulic auto-tensioner includes a sleeve having its bottom end press-fitted in a sleeve fitting hole in the bottom surface of a cylinder, a rod having its bottom end slidably fitted in the sleeve, and a return spring mounted between a spring support at the upper portion of the rod and the bottom surface of the cylinder. A pressure chamber communicates with a reservoir chamber through a passage formed between fitting surfaces of the sleeve fitting hole and the sleeve. The passage has a check valve. The rod has a valve fitting hole and a communication passage through which the valve fitting hole communicates with the reservoir chamber. The valve fitting hole has a relief valve. An orifice is formed between a valve hole formed in a valve seat of the relief valve and a valve body to prevent a sharp drop in pressure in the pressure chamber. | 12-25-2014 |
20150024887 | HYDRAULIC TIMING CHAIN TENSIONER AND TIMING CHAIN SYSTEM - The present invention relates to a timing chain system including a hydraulic pressure timing chain tensioner autonomously controlling a hydraulic pressure for maintaining tension of a timing chain to effectively operate. The system may include: a crankshaft sprocket; a camshaft sprocket controlling exhaust or intake timing of the engine; a timing chain operably connecting the crankshaft and camshaft sprockets; a chain guide for the timing chain; a chain tensioner pushing the chain guide inward; and an oil supply unit for the chain tensioner. The chain tensioner may include a housing, an operating unit case fixed to the housing, a reciprocating plunger inserted into the operating unit case, a high pressure chamber, a low pressure chamber, a supply hydraulic path supplying oil from the oil supply unit to the low pressure chamber, and a regulator controlling hydraulic pressure of the low pressure chamber. | 01-22-2015 |
20150024888 | DISPLACEMENT EQUALIZING HYDRAULIC TENSIONER FOR MULTI-STRAND ENDLESS CHAIN - A method and apparatus for tensioning multi-strand endless chain conveyors ensuring equal displacement and constant alignment of each strand of endless chain. Included are a hydraulically actuated cylinder assembly, a equalizing yoke assembly, and a guide frame assembly. Hydraulic lines supplying fluid to the cylinder assembly have both check valves to prevent retraction and pressure sight indicators to signal when proper hydraulic pressure is achieved during adjustment. A common yoke and guide track is included to maintain equal displacement of chain strands while applying tensioning force. Also included is a guidance apparatus that prevents seizing of components due to foreign debris and also allows for easy removal of system for maintenance or replacement. | 01-22-2015 |
20150072814 | TENSIONING MECHANISM WITH DAMPING SENSITIVE TO TEMPERATURES - A tensioning mechanism for tensioning an endless drive device such as, for example, a chain or a belt, is provided, with a tensioning device which can operatively engage with the endless drive device, a tensioning device seat in which the tensioning device is movably received, a pressure chamber being formed between the tensioning device and the tensioning device seat, a fluid inlet which opens into the pressure chamber, a fluid outlet exiting from the pressure chamber and a valve disposed in the fluid outlet. A tensioning mechanism is provided that avoids the drawbacks of known tensioning mechanisms and is, in particular, operable independently. It is provided for this that the valve is controlled automatically depending on temperature. | 03-12-2015 |
20150119175 | VARIABLE BELT TENSIONER FOR AN INTERNAL COMBUSTION ENGINE - The present disclosure describes a variable belt tensioner of an internal combustion engine for adjusting a belt tensioning. The tensioner includes in a series configuration an electric motor, a worm drive, a lever drive and a belt tensioner roller. The worm drive is driven by the electric motor and is mechanically connected to the lever drive for transmitting a rotation thereto. The lever drive is mechanically connected to the belt tensioner roller for transmitting a translation thereto, thus allowing the belt tensioner roller to adjust the belt tensioning. | 04-30-2015 |
20150292602 | CHAIN TENSIONER - Provided is a chain tensioner that can, with a simple structure, supply sufficient and necessary oil when restarted after a long time after the stop of oil supply, and control pressing force in accordance with operating conditions during the drive, thereby reducing vibration of the chain not only when restarted but also during the drive. In a chain tensioner | 10-15-2015 |
20150354673 | CHAIN TENSIONER - Provided is a chain tensioner that is capable of restricting the movement of a plunger at an engagement position, hardly causes its breakage and abrasion even if receiving a great force applied to the plunger, needs no setting for a backlash amount, and allows the engagement position of the plunger to be freely shifted forward and backward. | 12-10-2015 |
20150354674 | CHAIN OR BELT TENSIONER WITH A RATCHET THAT DEACTIVATES - A tensioner comprising a piston slidably received within a piston bore of the housing having a plurality of grooves formed on an outer circumference, the piston forming a first pressure chamber with the piston bore. The tensioner uses a mechanism to remove a sliding pawl or expandable clip from engaging the grooves on the piston, such that the piston can move towards the housing and reduce chain load when fluid pressure is reduced in the first pressure chamber during engine shutdown, but not so much as to leave the chain uncontrolled during engine restart. The mechanism may for example be a fluid biased spool piston which engages the expandable clip or a pawl piston that engages a sliding pawl. | 12-10-2015 |
20160084359 | SERIES ARRANGEMENT OF HYDRAULIC CHAIN TENSIONER AND RATCHET - A tensioner ( | 03-24-2016 |
20160107722 | Bicycle Single-Acted Gear-Shifting Device and Its Unidirectional Operator Mechanism - Bicycle single-acted gear-shifting device ( | 04-21-2016 |
20160123435 | TENSIONER - To provide a tensioner which can circulate a sufficient amount of oil even if there is a long time lag until pressurized oil starts to be supplied, and which exhibits a lower level of leak of oil stored therein, and which is structured simply without increasing the number of components therefore. The tensioner includes: a tensioner body having a plunger bore; a cylindrical plunger slidably inserted into the plunger bore; and biasing means for urging the plunger outward. When the tensioner is fixed to a wall surface, a body hole that extends from the wall surface up to a circumferential surface of the plunger bore is located lower than an oil discharge hole in the wall surface. | 05-05-2016 |
20160153530 | TENSIONER | 06-02-2016 |
20160167740 | LINEAR DERAILLEUR MECHANISM | 06-16-2016 |
20160186838 | CHAIN TENSIONER - An object of the present invention is to provide a chain tensioner that allows a necessary and sufficient amount of oil to be fed during restart following a long stoppage of oil feeding and that maintains a proper pressure, thus preventing possible noise and vibration. An oil storing chamber | 06-30-2016 |
20160186840 | TRANSMISSION SYSTEM COMPRISING AN OIL WET TOOTHED BELT - A transmission system is provided that has a drive pulley, at least one driven pulley and an oil wet toothed belt. The toothed belt includes a toothing and a back, a first portion, wherein the toothing is coupled to the drive pulley, a second portion wherein the toothing is coupled to at least one driven pulley, a first taut branch which develops towards the driving pulley and a second slack branch which develops towards the driven pulley. The transmission system also includes a fixed containment guide having at least a first wall facing the toothing and/or the back positioned at a distance from the toothed belt between a minimum distance where at rest it is not in contact with the toothed belt and a maximum distance equal to 5% of the length of one between the taut branch and the slack branch. | 06-30-2016 |