| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 123900520 | Lash adjustment | 65 |
| 20080223326 | Switchable support element for a valve train of an internal combustion engine - A switchable support element ( | 09-18-2008 |
| 20090007871 | VALVE TRAIN OF AN INTERNAL COMBUSTION ENGINE HAVING A CYLINDRICAL VALVE TAPPET - The invention proposes a push-rod valve train having an adjustable valve tappet ( | 01-08-2009 |
| 20090101097 | Valve driving device for internal combustion engine - A lost motion spring is disposed to contact at one end an oscillating member interposed between a cam and a valve for synchronizing the oscillating of the valve with the rotation of the cam. The lost motion spring impels the oscillating member toward the cam. A spring support shaft is provided for supporting a second portion of the lost motion spring. A spring position adjustment mechanism is provided for adjusting the mounting position of the lost motion spring relative to the spring support shaft. | 04-23-2009 |
| 20090114177 | ROLLER FINGER FOLLOWER FOR VALVE DEACTIVATION - The finger follower has an inner and outer body and a torsional lost motion spring positioned at its lash adjuster end of the outer body. The torsional lost motion spring has two helical parts each with a short leg that abuts the outer body and a long leg that contacts the inner body. The torsional spring is located above the pivot point of the finger follower so as to provide a low mass moment of inertia and to reduce the weight over the valve stem end of the follower. | 05-07-2009 |
| 20090250031 | Valve Lash Adjustment and Inspection Apparatus - An apparatus and method for automatically adjusting the valve lash of an internal combustion engine is provided. In another aspect of the present invention, a probe is employed for verifying and/or setting valve lash settings in an automated manner. A further aspect of the present invention does not require determination of a zero lash position or reference datum prior to adjusting the valve lash adjusting screw for desired lash. | 10-08-2009 |
| 20090314237 | SWITCHABLE BUCKET TAPPET - A switchable bucket tappet for a valve drive of an internal combustion engine, which has a bucket base body with a ring-shaped base guided by a skirt projecting from the outer edge of the base, in a bore of the engine. A lifting cam acts on the base and a hollow cylindrical extension projects from an inner edge of the base. In the bore, an inner body is axially movable relative to the bucket base body and, formed in the underside of the inner body, is a support for indirect contact with a gas exchange valve. A coupling piston, which has a flattened portion on its upper side, runs in a bore of the inner body and is engaged with a driver surface for full valve lift. A lost motion spring acts between the bucket base body and inner body. | 12-24-2009 |
| 20100242886 | SEALED LASH ADJUSTER AND SEAL STRUCTURE BETWEEN FIRST AND SECOND PARTS - A sealed lash adjuster ( | 09-30-2010 |
| 20100263614 | LASH ADJUSTER - A lash adjuster is provided in which the friction coefficient between the pressure flanks is less likely to decrease over a long time use. | 10-21-2010 |
| 20110162610 | HERMETICALLY SEALED LASH ADJUSTER - A sealed type lash adjuster ( | 07-07-2011 |
| 20110271924 | SWITCHABLE COMPONENT FOR A VALVE DRIVE OF AN INTERNAL COMBUSTION ENGINE - A switchable component, which has a housing with a bore and an inner element held in the bore with a head that projects above a rim of the housing. The housing and the inner element are loaded away from each other by a lost-motion spring. At least one coupling piston sits in an opening of the inner element. Sections of the coupling piston are moveable over a ring surface to a carrier surface of the housing. A retaining ring packet has a circular arc-shaped outer surface that lies in a ring groove of the bore of the housing. A ring face of the inner element sits against the underside of the retaining ring packet in the extended state defining relative position. The retaining ring packet, starting from at least one of the surfaces of the retaining ring packet has recesses for forming tab-like sections lying circumferentially between the recesses. | 11-10-2011 |
| 20120006293 | MECHANICAL VALVE CLEARANCE COMPENSATION ELEMENT WITH TWO-PART ADJUSTING BOLTS - Valve clearance compensation element ( | 01-12-2012 |
| 20130174799 | ACTUATOR OF AN ELECTROHYDRAULIC GAS EXCHANGE VALVE DRIVE OF AN INTERNAL COMBUSTION ENGINE - The invention relates to an actuator of an electrohydraulic gas exchange valve drive of an internal combustion engine, comprising an actuator housing ( | 07-11-2013 |
| 20130233266 | SHIM FOR VALVE DRIVE MECHANISM, AND VALVE DRIVE MECHANISM - The present invention provides a shim for a valve drive mechanism which is interposed between a pad surface of a rocker arm and a stem end surface of a valve. The shim includes a ship top surface that is contacted by the pad surface. The shim top surface is rotated about a center thereof to be cut, is provided with a center hole at the center thereof, and is shaped such that the pad surface does not contact an intersection line between an inner peripheral surface of the center hole and the shim top surface when the rocker arm is swung. | 09-12-2013 |
| 20140338622 | VALVE LIFT ADJUSTMENT ARRANGEMENT FOR A MECHANICALLY CONTROLLABLE VALVE DRIVE ARRANGEMENT, AND METHOD FOR ALIGNING AN INTERMEDIATE LEVER ARRANGEMENT - A valve lift adjustment arrangement for a mechanically-controllable valve drive arrangement includes a bearing shaft, a first roller, a second roller arranged on the bearing shaft, a camshaft arrangement, a valve lift adjustment device comprising a rotatable eccentric shaft, an intermediate lever arrangement, and a device. The intermediate lever arrangement comprises an intermediate lever with a working curve. The intermediate lever is mounted via the first roller to be movable in a slotted-guide track and to be operatively connected to the camshaft arrangement and to the valve lift adjustment device. The device is configured so that the second roller is eccentrically mounted. The device comprises a tool engagement point which aligns the second roller and thereby the intermediate lever arrangement. The camshaft arrangement acts, via the first roller, on the intermediate lever arrangement. The rotatable eccentric shaft is acts, via the second roller, on the intermediate lever arrangement. | 11-20-2014 |
| 20160177790 | LASH ADJUSTER AND METHOD OF MAKING SAME | 06-23-2016 |
| 123900530 | Self-operating | 50 |
| 20100288219 | LASH ADJUSTER - A lash adjuster is provided of which the return spring is never compressed excessively when the adjusting screw is pushed into the nut member, and of which the external thread on the outer periphery of the adjusting screw can be formed easily by rolling. | 11-18-2010 |
| 20110094467 | LASH ADJUSTER - In accordance with the present invention, a lash adjuster is provided for minimizing stress on a valve train system in the event of its failure. Specifically, the present invention lash adjuster is for use in a valve train system having a cam for actuating the opening and closing of a valve, where the cam has a select size and shape for determining the velocity or acceleration of the valve's opening and closing. The present invention lash adjuster generally comprises a housing having a base and a plunger positioned within the housing at a select axial clearance from the base. This clearance is generally sized and shaped such that, in the event of lash adjuster failure, a select maximum velocity or acceleration of valve opening and closing is maintained, thereby minimizing stress on the valve train system. | 04-28-2011 |
| 123900540 | Screw | 4 |
| 20100275865 | LASH ADJUSTER - A lash adjuster includes a nut member inserted in a receiving hole formed in the top surface of a cylinder head, an adjusting screw having an external thread on its outer periphery which is in threaded engagement with an internal thread on the inner periphery of the nut member, and a return spring biasing the adjusting screw. The adjusting screw has an end protruding from the nut member and pivotally supporting an arm of a valve gear. The adjusting screw is a solid member. A spring seat is disposed between the adjusting screw and the return spring and kept in point contact with the end of the adjusting screw inserted in the nut member. The spring seat is axially slidably fitted in the inner periphery of the nut member, thereby keeping the adjusting screw and the spring seat coaxial with each other. | 11-04-2010 |
| 20110005484 | LASH ADJUSTER - A lash adjuster is provided of which the adjusting screw can be repeatedly and easily brought into the initial set position. | 01-13-2011 |
| 20110017161 | LASH ADJUSTER - A lash adjuster is provided of which an adjusting screw can be repeatedly fixed in position. | 01-27-2011 |
| 20150075470 | MECHANICAL LASH ADJUSTER - The mechanical lash adjuster is arranged between a cam and one end of the stem of a valve urged by a valve spring. The lash adjuster comprises an unrotatable housing having a thread, a plunger subjected to the force of the cam and formed with a thread in engagement with the thread of the housing, and a plunger spring urging the plunger against the action of the valve spring. The lead and flank angles of the engaging threads are set such that the engagement threads can slidably rotate under a given shaft load applied to the plunger unless the frictional torque TB, generated by the friction between the slidable frictional surface F | 03-19-2015 |
| 123900550 | Hydraulic | 44 |
| 20080196684 | HYDRAULIC LASH ADJUSTER - A hydraulic lash adjuster includes a cylindrical body having a central cylindrical bore. A hollow plunger is reciprocable in the bore and includes a reservoir chamber therein. The plunger has a close clearance with the bore. A high pressure chamber is defined by the plunger and a closed end of the bore. An orificed wall of the plunger separates the reservoir chamber from the high pressure chamber. A check valve is disposed in the orifice for allowing one-way flow of oil from the reservoir chamber to the high pressure chamber. A plunger spring disposed in the high pressure chamber urges the plunger away from the closed end of the bore. A seat is disposed at an end of the plunger distal from the high pressure chamber. The plunger includes a circumferential groove proximate the seat for holding oil to maintain an oil seal in the clearance to limit leakage of air through the clearance. | 08-21-2008 |
| 20080271694 | Limited travel hydraulic lifter and methods of assembly and use thereof - A travel limited plunger for a hydraulic lifter for, among other purposes, use in racing and/or other high performance applications. In one variation, an existing retaining clip is replaced by a heavy duty retainer and a precisely sized spacer is inserted between the retainer and the plunger to limit travel of the plunger. In a second variation, the existing retaining clip is removed, a retaining groove is formed (e.g., by machining) within the interior of the lifter at a position located so as to allow a retainer inserted therein to limit travel of the plunger to a predetermined distance. | 11-06-2008 |
| 20080283011 | PUSHROD ENGINE WITH MULTIPLE INDEPENDENT LASH ADJUSTERS FOR EACH PUSHROD - A multiple-cylinder internal combustion engine having a camshaft-driven valvetrain with a camshaft disposed within an engine block includes at least two intake and/or exhaust valves with multiple valves operated by a common lifter and pushrod that engages a follower having multiple independent lash adjusters coupled to associated rocker arms. The lifter contacts the common camshaft lobe and a corresponding pushrod that engages a reciprocating bucket follower with a compliant coupling to corresponding rocker arms. | 11-20-2008 |
| 20090007872 | SWITCHABLE DUAL LIFTER - The switchable dual lifter has two hydraulic lash adjusters, one which is fixed within the common housing, and the other which is movable to allow for deactivation of one of the two valves acted on by the dual lifter. Using the dual lifter with a switchable hydraulic lash adjuster allows for closing of one of the adjacent valves while allowing the other of the adjacent valves to operate. | 01-08-2009 |
| 20090007873 | Compact Lash Adjuster Feed Channel Apparatus - The apparatus of the present invention provides a lash adjuster feed channel for an engine assembly. The engine assembly includes first and second sets of hydraulic lash adjusters responsive to a variation in hydraulic fluid pressure to cause a variation in lift of first and second sets of engine valves respectively operatively connected thereto. The cylinder head defines a first feed passage in fluid communication with the first set of hydraulic lash adjusters, and a second feed passage in fluid communication with the second set of hydraulic lash adjusters. The valve lift of the first set of engine valves is independently variable by controlling the transfer of hydraulic pressure in the first feed passage, and the valve lift of the second set of engine valves is independently variable by controlling the transfer of hydraulic pressure in the second feed passage. A corresponding method is also provided. | 01-08-2009 |
| 20090020088 | LASH ADJUSTER AND VALVE APPARATUS - A lash adjuster of the invention includes a body in a cylindrical shape and a plunger inserted to inside of the body. The plunger partitions a pressure chamber at inside of the body by being integrated to the body, and is moved in an axial direction at inside of the body by increasing or reducing a volume of inside of the pressure chamber by making a working fluid flow to inside of the pressure chamber or flow out from the pressure chamber. Further, between an inner peripheral face of the body and an outer peripheral face of the plunger, a spacer filling a gap between the two faces is interposed. | 01-22-2009 |
| 20090031977 | LOW PROFILE VALVE LIFTER ASSEMBLY - The low profile valve lifter assembly has flats inside the bore of the outer housing and walls are formed and extended down from the plate of the guide such that the walls align with the flats of the bore to prevent rotation of the lifter with the guide. A groove and protuberance are provided in the flats and on the side wall of the guide in order to properly orient the lifter with the guide. The flats can be connected to form a pocket and the walls of the guide can be connected to form a sleeve that mates with the pocket. | 02-05-2009 |
| 20090044775 | Hydraulic Lash Adjuster With Damping Device - A system and method for lash adjustment in the valvetrain of an internal combustion engine include a hydraulic lash adjuster having a damping device to limit rate of movement of a plunger relative to a body to control response time of the lash adjuster reducing or eliminating over-compensation or pump-up of the lash adjuster. | 02-19-2009 |
| 20090064955 | VALVE CONTROL FOR RECIPROCATING PISTON INTERNAL COMBUSTION ENGINE - Valve controller for reciprocating piston internal combustion engines with at least two intake and/or exhaust gas-exchange valves for each piston/cylinder unit, wherein the gas-exchange valves are guided by valve stems in a cylinder head ( | 03-12-2009 |
| 20090145391 | SWITCHING ELEMENT FOR A VALVE TRAIN OF AN INTERNAL COMBUSTION ENGINE - The invention proposes a switching element ( | 06-11-2009 |
| 20090159030 | SWITCHABLE HYDRAULIC LASH ADJUSTER WITH SPHERICAL LOCKING PINS - The switchable hydraulic lash adjuster uses balls that move radially in order to lock and unlock the switchable elements in the hydraulic lash adjuster. An axially movable piston acts on the ball to force it to engage and to allow it to disengage the inner housing. | 06-25-2009 |
| 20090173303 | HYDRAULIC LASH ADJUSTER EQUIPPED WITH AUXILIARY CHECK VALVE - An auxiliary check valve is provided in a hydraulic lash adjuster of the type wherein the plunger-to-body clearance is sealed. The auxiliary check valve is derived so that it remains open until the plunger has been moved to the limit of its travel by rotation of the engine camshaft during engine assembly. The auxiliary check valve permits fluid within the hydraulic lash adjuster high pressure chamber to be displaced to the reservoir chamber allowing the hydraulic lash adjuster to shorten from its free length to the proper installed length. | 07-09-2009 |
| 20090188457 | Lash Adjuster - A lash adjuster includes a cylindrical bottomed plunger mounted in a cylindrical bottomed body so as to be movable upward and downward and including a high-pressure chamber defined between an underside of the plunger and a bottom wall of the body to reserve an operating oil, a leak path defined by an inner circumference of the body and an outer circumference of the plunger so that the oil reserved in the high-pressure chamber leaks through the leak path with downward movement of the plunger, and a ring-shaped member located between the inner circumference of the body and the outer circumference of the plunger, normally projecting into the leak path and being elastically deformed radially inward or outward with increase in pressure of the oil at the high-pressure chamber side so as to be retreated from the leak path, thereby reducing flow resistance of the oil in the leak path. | 07-30-2009 |
| 20090199804 | Cam lobe profile to accommodate mechanical lash of a switchable hydraulic lash adjuster - In an engine valve train equipped with a DHLA, the radius of the base circle of a cam lobe is decreased, relative to the radius of the base circle of a cam lobe in an engine equipped with an HLA, in proportion to the internal lash in the DHLA. The actual decrease in the base-circle radius is calculated by trigonometric relationships among the base circle portion, the length of the rocker pivot arm, and the internal lash of the DHLA. The decrease in the base circle radius is compensated by extension of the valve train lash-adjustment mechanism of the DHLA. After the internal DHLA lash is taken up during valve actuation, the coordinate position of the pivot point of the DHLA rocker arm is then identical with the coordinate position of the pivot point of an HLA rocker arm of a DHLA-equipped engine. | 08-13-2009 |
| 20090199805 | Deactivating hydraulic lash adjuster for oriented mounting in an engine - A deactivating hydraulic lash adjuster comprising a pin housing slidably disposed in a body and having at least one lock pin disposed in a transverse bore for extending into a receiver feature in the body to lock the two together during periods of engine operation in valve non-deactivation mode. The present improvement consists in providing a first orienting feature for the lash adjuster body that engages a second orienting feature on an engine head to provide a preferred and fixed orientation of the body within a bore in the engine head. In a currently preferred orientation, the axis of the at least one lock pin is parallel to the axis of the engine camshaft. The orientation of the lock pin(s) to the body is made invariant by insertion of a pin through a radial bore in the body into a longitudinal groove in the pin housing. | 08-13-2009 |
| 20090320780 | CONTROL ARRANGEMENT FOR A GAS EXCHANGE VALVE IN A PISTON ENGINE AND METHOD OF CONTROLLING A GAS EXCHANGE VALVE IN A PISTON ENGINE - A control arrangement for a gas exchange valve in a piston engine adapted between the camshaft of the engine and the valve mechanism, which control arrangement comprises a body part and a chamber arranged therein, into which chamber a connection for hydraulic medium opens and in which a piston device is arranged in force transmission connection with the camshaft and the valve mechanism. The connection for hydraulic medium opens to a space in the chamber, which space increases as the piston device moves in the opening direction of the valve, whereby hydraulic medium is arranged to flow into the space, when the valve is being opened, and out of the space, when the valve is being closed. | 12-31-2009 |
| 20100031907 | VALVE DRIVE FOR AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR WITH A DECOMPRESSION BRAKE - A valve drive with a decompression brake for an internal combustion engine, which has a camshaft with a cam, a rocker arm for transmitting the cam stroke to a gas exchange valve, a pivot bearing supporting the rocker arm, and a hydraulic valve play compensating element arranged in force flow between the cam and gas exchange valve. The valve play compensating element is fixed in the engine and valve drive also has a secondary lever with a first and second lever section. The secondary lever is angularly connected, between the lever sections, to a lever support formed on the rocker arm, is supported with the first lever section on the valve play compensating element and actuates the gas exchange valve by the second lever section. The effective lever arm of the first lever section is considerably greater than the effective lever arm of the second lever section. | 02-11-2010 |
| 20100037845 | HYDRAULIC SUPPORT ELEMENT FOR A SWITCHABLE CAM FOLLOWER OF A VALVE DRIVE OF AN INTERNAL COMBUSTION ENGINE - A hydraulic support element for a switchable cam follower of a valve drive of an internal combustion engine, which has a pot-like housing with a bore, a pressure piston formed in one piece with an external casing and head projecting over an edge of the housing and a high pressure space for a hydraulic medium. The high pressure space is supplied, via a non-return valve from a first reservoir space, which is fed via first passages in the housing and pressure piston. A second reservoir space is formed in the pressure piston axially above the first reservoir space and is filled by second passages in the housing and pressure piston. From the second reservoir space a hydraulic medium is conducted to the cam follower via an opening in the head. The reservoir spaces are separated by a ball around which the internal wall of the pressure piston is wrapped | 02-18-2010 |
| 20100071649 | BALL PLUNGER FOR USE IN A HYDRAULIC LASH ADJUSTER AND METHOD OF MAKING SAME - A cold-formed ball plunger blank is provided for use in manufacturing a finished ball plunger used in a hydraulic lash adjuster that includes a check valve assembly having a check ball and a retainer. The ball plunger blank includes a cup-shaped member that extends from a first end to a second end along a longitudinal axis. The cup-shaped member includes a ball portion adjacent the first end of the member and a body portion adjacent the second end of the member. The body portion has a cavity disposed therein, a counterbore extending from the second end of the body towards the first end of the member, and a shoulder that separates the cavity from the counterbore and at least partially closes the cavity. The shoulder defines a ball seat surface configured to receive the check ball and a retainer receiving surface configured to receive the retainer, wherein the ball seat surface and the retainer receiving surface are to sized to the final dimensions of the finished ball plunger. A method of cold-forming a ball plunger blank including providing a slug having first and second ends, backward extruding the slug at its first end to form a cavity that is defined by a wall, forming a generally ball-shaped outer surface at the second end of the slug to final dimensions, and upsetting at least a portion of the wall to form a shoulder that at least partially closes the cavity and defines a ball seat surface to its final dimensions. | 03-25-2010 |
| 20100186701 | ENGINE INCLUDING CYLINDER DEACTIVATION ASSEMBLY AND METHOD OF CONTROL - A method of purging air from an oil passage in communication with a lifter assembly in an engine assembly may include isolating the oil passage from a pressurized oil source while the lifter assembly is engaged with a base region of a cam lobe to operate the first lifter assembly in the activated mode. The pressurized oil may be provided to the lifter assembly via the oil passage after the isolating when the lifter assembly is engaged with a lift region of the cam lobe. The lifter assembly may be maintained in the activated mode after the providing. Air may be purged from the oil passage based on the pressurized oil provided to the oil passage. | 07-29-2010 |
| 20100275866 | Switchable Valve Lifter Having a Mis-Assembly Indicator - An improved SHVL for an internal combustion engine comprises an improved arrangement for locking a spring tower into a pin housing. The spring tower is provided with an annular OD groove as in the prior art. The pin housing ID groove is modified to have a two-step groove comprising two adjacent regions having different depths (different diameters) and having a distinct transition lip therebetween. A spring clip of the correct size seats properly in the spring tower groove and in the lesser-diameter pin housing groove, resulting in a correct overall length of the SHVL. Any oversize clip is caught between the lower lip of the spring tower groove and the transition lip of the two-step pin housing groove, resulting in a SHVL distinctly shorter than nominal, which is easily detected by either direct length measurement or a gauge. | 11-04-2010 |
| 20100307438 | VARIABLE TAPPET - A variable tappet may include an outer tappet body, an inner tappet body that is slidably disposed within the outer tappet body and selectively connected with the outer tappet body, a lost motion elastic member that is disposed within the outer tappet body and elastically supports the outer tappet body, and a connecting unit that is slidably disposed within the inner tappet body and selectively connects the outer tappet body and the inner tappet body. | 12-09-2010 |
| 20110011361 | COUPLING DEVICE | 01-20-2011 |
| 20110067661 | LOST MOTION VARIABLE VALVE ACTUATION SYSTEM WITH VALVE CATCH PISTON - Hydraulic lost motion systems and methods for actuating an internal combustion engine valve include a master piston slidably disposed in a housing. One or more master piston fluid passages extend from a bore provided in the master piston and register with a fluid passage extending through the housing. A slave piston is slidably disposed in a lower portion of the master piston bore and a valve catch piston is slidably disposed in an upper portion of the master piston bore. The valve catch piston may have a hollow interior, a lower end orifice extending from the hollow interior through a lower end of the valve catch piston, one or more side passages extending through a side portion of the valve catch piston, and one or more seating passages extending through the valve catch piston wall. | 03-24-2011 |
| 20110277715 | COLD-FORMED FLAT TOP PLUNGER FOR USE IN A HYDRAULIC LASH ADJUSTER AND METHOD OF MAKING SAME - A cold-formed flat top plunger blank is provided for use in a hydraulic lash adjuster. An end wall at the first end of the plunger body defines a flat top surface that is cold-formed to final dimensions or net shape. The flat top surface at the first end of the plunger body is configured to engage a flat surface within the mating bore of an engine cylinder head. By configuring the plunger body to have a flat top surface that engages a flat surface disposed within the mating bore of an engine cylinder head, the force applied to the engine block by the lash adjuster is distributed more evenly, minimizing wear. The external flat top plunger is a unitary component cold-formed to near net shape, including cold-forming to final dimensions the flat top surface and a counterbore. | 11-17-2011 |
| 20120042843 | HYDRAULIC LASH ADJUSTER FOR INTERNAL COMBUSTION ENGINE | 02-23-2012 |
| 20120272932 | FLUID PRESSURE CONTROL VALVE - A valve assembly configured to provide feed-back control of pressurized fluid in a gallery includes a housing and a pressure chamber. The valve assembly also includes a first passage for providing continuous flow of fluid through the gallery and a second passage for supplying the pressurized fluid to the gallery. The valve assembly additionally includes a piston moveable within the pressure chamber between a first position that opens the second passage and a second position that closes the second passage. The piston includes a third passage that provides fluid communication between the first passage and the pressure chamber. Furthermore, the valve assembly includes a spring configured to move the piston to the first position when gallery fluid pressure is less than a threshold pressure value and permit the piston to shift to the second position when gallery fluid pressure is equal to or greater than the threshold pressure value. | 11-01-2012 |
| 20120325171 | Hydraulic Lash Adjuster Including Band Of Radial Recirculation Openings - A hydraulic lash adjuster includes a body defining an axial bore and having an open end and a closed end. A hollow piston is telescopically received within the axial bore and defines a fluid reservoir. The hollow piston has a first end disposed within the axial bore and a second end extending outwardly beyond the open end of the body. A high pressure volume is defined by the axial bore and the first end of the hollow piston. The hydraulic lash adjuster also includes a valve mechanism positioned through an opening of the hollow piston and including a valve member having an open position defining a fluid path from the fluid reservoir to the high pressure volume. The valve member also has a closed position in which the fluid reservoir is fluidly blocked from the high pressure volume at the opening. The hollow piston includes a band of radial recirculation openings defining recirculation paths from the high pressure volume to the fluid reservoir along an exterior of the hollow piston. A diameter of each of the radial recirculation openings is smaller than a width of the band. | 12-27-2012 |
| 20130104825 | HYDRAULIC VALVE LIFTER PUSHROD SEAL | 05-02-2013 |
| 20130186359 | DEACTIVATING HYDRAULIC VALVE LASH ADJUSTER/COMPENSATOR WITH TEMPORARY LASH COMPENSATION DEACTIVATION - A valve operating mechanism includes a pin housing housed in a lash adjuster and a lash adjustment chamber. A sync pin is slidably received within the housing between an activating position and a deactivating position. A ball valve assembly is provided within the housing for communication with the chamber, and is moveable between an open position and a closed position. The valve operating mechanism is operable in an active mode and a deactive mode. In the active mode, the sync pin is in the activating position, a valve is in an active state and the valve operating mechanism is configured to adjust valve lash. In the deactive mode, the sync pin is in the deactivating position and the valve is in a deactive state. The valve operating mechanism is configured to generate valve lash to allow the operating mechanism to move between the active mode and the deactive mode. | 07-25-2013 |
| 20130298859 | HYDRAULIC LASH ADJUSTER, A VALVE TRAIN COMPRISING THE SAME AND A METHOD OF ASSEMBLING THE SAME - A hydraulic lash adjuster includes a body and a plunger assembly slideably mounted with respect to the body. A first chamber is defined by the body and the plunger assembly and is configured to contain a hydraulic fluid. A second chamber is configured to supply the hydraulic fluid to the first chamber through a valve disposed between the first and second chambers in response to a movement of the plunger assembly that increases the volume of the first chamber. An aperture opens into the second chamber. A stopper is insertable into the aperture during use of the hydraulic lash adjuster such that the stopper restrains the hydraulic fluid from exiting the second chamber through the aperture and enables air to exit the second chamber through the aperture. | 11-14-2013 |
| 20130319358 | VALVE DRIVE WITH ADDITIONAL LIFT IN THE CAM BASE CIRCLE - A valve drive of an internal combustion engine, having a finger lever which acts at one end on a gas exchange valve and which is seated at the other end on a head of a housing of a support element, which housing runs in an axially movable manner in a reception bore of a cylinder head, the finger lever is acted on by a cam from the base circle from which there projects in a fixed manner an additional cam piece for generating an additional lift of the gas exchange valve, a bore extends from a bottom of the housing in the direction of the head, in the lower portion of which bore there runs a pressure piston which is axially movable relative to the housing and via the lower face of which the support element is mounted on a base of the reception bore of the cylinder head, a high-pressure chamber for hydraulic medium is formed between an upper face of the pressure piston and a ring part situated above said upper face and which is fixed with respect to the housing, and to generate the additional lift, the high-pressure chamber is flooded with hydraulic medium such that the housing is deployed relative to the pressure piston, supported on the hydraulic medium column accumulated in the high-pressure chamber, and to deactivate the additional stoke, the hydraulic medium in the high-pressure chamber is discharged such that the housing is retracted. | 12-05-2013 |
| 20140041609 | SEAL FOR SWITCH VALVES - A switch valve for a hydraulic unit, in particular a quick-acting valve for a hydraulic unit of a hydraulically variable valve gear of a reciprocating internal combustion engine, having a valve body, which is guided in an axially movable manner in a housing part and which is sealed with respect to the housing part by a seal, wherein the seal is designed as a flat seal element, which encloses the valve body in a sealing manner and which is operatively connected to an axial surface of the housing part in a sealing manner. | 02-13-2014 |
| 20160040563 | HYDRAULIC LASH ADJUSTER ANTI-ROTATION CLIP - A hydraulic lash adjuster arrangement is provided that includes a cylinder head including a bore and at least one hydraulic fluid gallery. The hydraulic lash adjuster arrangement includes a hydraulic lash adjuster assembly including a housing positioned in the bore of the cylinder head and including an annular body that includes a port on a radially outer wall of the housing. A plunger is arranged within the annular body of the housing and is axially displaceable therein. A clip including a circular body is arranged radially between the housing and the cylinder head. The clip includes at least one first tab extending radially outwardly that engages the at least one hydraulic fluid gallery and at least one second tab extending radially inwardly that engages the port. | 02-11-2016 |
| 20160084117 | SYSTEM TO DIAGNOSE VARIABLE VALVE ACTUATION MALFUNCTIONS BY MONITORING FLUID PRESSURE IN A HYDRAULIC LASH ADJUSTER GALLERY - A system for diagnosing malfunctions in a variable valve actuation device. The system has a rocker arm assembly with first and second arms attached at a first end and a hydraulically operated latch assembly to secure the first arm to the second arm when latched. The rocker arm assembly pivots upon a hydraulic lash adjuster and includes a source of pressurized fluid connected to a hydraulic valve providing high or low pressure fluid to the hydraulically-operated latch. The latch may be operated by a remote device. A pressure transducer positioned within the hydraulic lash adjuster (HLA) is adapted to create a signal indicating fluid pressure in the HLA. A control unit coupled to the hydraulic valve and the pressure transducer is adapted to sense engine operating parameters, actuate the hydraulic valve, read the signal from the pressure transducer and identify malfunctions of the rocker arm assembly based upon the signal. | 03-24-2016 |
| 20170234173 | HYDRAULIC LASH ADJUSTER | 08-17-2017 |
| 20190145289 | LASH ADJUSTMENT IN LOST MOTION ENGINE SYSTEMS | 05-16-2019 |
| 123900570 | Vent or bleed means for pressure chamber | 4 |
| 20090090324 | Sealed Lash Adjuster and Method for Adjusting Amount of Liquid Sealed in Sealed Lash Adjuster - The liquid is sealed in the lash adjuster so that the volume “V1” of the gas, in the reservoir chamber when the lash adjuster is being produced and the plunger protrudes from the body, is equal to or more than 1.24 times as great as the sum of the volume “Vo1” of the liquid discharged from the high-pressure chamber when the plunger moves downward, and the increase “Vo2” in the volume of the liquid that expands, due to heat, when the temperature of the gas in the reservoir chamber is increased from the production temperature to the maximum use temperature, and the ratio of “V1” to “Vo1+Vo2” is equal to or higher than a ratio, which is derived based on the production temperature and the maximum use temperature, when the inner pressure of the lash adjuster increases by 500 kPa at maximum. | 04-09-2009 |
| 20090205601 | OIL SYSTEM FOR ACTIVE FUEL MANAGEMENT ON FOUR VALVE ENGINES - An oil system for selectively deactivating valves for specified cylinders of an internal combustion engine includes a cylinder head having a lash adjuster oil passage and a cylinder deactivation oil passage. Plugs are coupled to the cylinder head separating the cylinder deactivation oil passage into separate portions. A clearance between a portion of each plug and the head allows a controlled flow of oil to pass from the lash adjuster oil passage to the cylinder deactivation oil passage to purge air from the cylinder deactivation oil passage. A valve is operable to selectively supply pressurized oil to the cylinder deactivation oil passage to deactivate the specified cylinders. | 08-20-2009 |
| 20090308340 | Cam-Driven Hydraulic Lost-Motion Mechanisms for Overhead Cam and Overhead Valve Valvetrains - A valve operating system includes a cam and a roller follower. An input piston is spring-biased to follow motion of the roller follower. A hydraulic chamber filled with fluid selectively transfers motion from the input piston to an output piston operatively engaged with a poppet valve. A variable-bleed valve is in fluid communication with the hydraulic chamber and an outlet channel and configured to selectively vary a bleed rate between the hydraulic chamber and outlet channel. Displacement of the input piston into the hydraulic chamber causes movement of the output piston, depending on the bleed rate. A pushrod may transfer motion from the roller follower to the input piston. A hydraulic damping shoulder may restrict the closing velocity of the output piston. The system may be further characterized by an absence of a rocker arm. An auxiliary piston may replace the variable-bleed orifice in the lost-motion hydraulic linkage. | 12-17-2009 |
| 20120024249 | HYDRAULIC BACKLASH COMPENSATING ELEMENT - A hydraulic backlash compensating element for an internal combustion engine, which has a housing in which a pressure-actuated piston is mounted The piston has a check valve via which oil can flow into the housing, and the check valve has a valve seat and a valve element arranged movably therein. The valve element is a hollow ball. | 02-02-2012 |
| 123900580 | Self-contained | 2 |
| 20100282194 | SEALED-TYPE LASH ADJUSTER - A lash adjuster | 11-11-2010 |
| 20110000452 | LASH ADJUSTER - A lash adjuster in which, when a plunger descends, a valve element moves to a valve-closed position without delay. A check valve ( | 01-06-2011 |
| 123900590 | With provision for horizontal positioning | 1 |
| 20080289597 | Switchable valve train member - A deactivation valve lifter includes a lifter body. The lifter body has a first end configured for engaging a cam of an engine and at least one annular pin chamber. A pin housing includes a pin housing bottom. The pin housing bottom defines at least one pin stop aperture and a radially directed pin bore. A deactivation pin assembly is disposed within the pin bore and includes pin members. The pin housing is concentrically disposed within the lifter body. A portion of each pin member may be disposed within the annular pin chamber to thereby selectively couple and decouple the lifter body to the pin housing. A drain aperture defined by the pin housing bottom extends from the pin bore to an outside surface of the pin housing. A stop pin is disposed in the at least one pin stop aperture for limiting the inward motion of the pin members. | 11-27-2008 |
