| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 092208000 | Open-ended hollow skirt type (e.g., trunk type) | 25 |
| 20080202330 | Rotor Recess With Scupper Slots and Free Casting - A piston for an internal combustion engine includes a piston head provided with an annular field, and a piston shaft arranged beneath the annular field. The piston shaft has shaft surfaces and a recess surface which is arranged around a bolt borehole and set back in relation to an outer diameter of the piston. At least one cavity is provided in the region of the lowest annular groove for oil flow in the direction of the recess surface during the movement of the piston and the at least one cavity is arranged outside an especially stressed region above the bolt borehole. | 08-28-2008 |
| 20080307958 | Two-part piston for an internal combustion engine - A two-part piston for an internal combustion engine consists of an upper part, a lower part and a circumferential, closed cooling channel radially on the outside and close to the piston crown. The channel is closed off, on its underside, by a cooling channel cover which is connected via a skirt connection with two skirt elements that lie opposite one another. In order to reduce the piston weight and nevertheless avoid secondary movements of the piston, circumferential recesses are provided in the region of the skirt elements, which are delimited by the cooling channel cover on the piston crown side and by the skirt connections on the skirt side. The skirt connections are connected with the radially inner region of the cooling channel cover on the piston crown side, and with the upper regions of the skirt elements on the skirt side. | 12-18-2008 |
| 20100083827 | METHOD FOR SURFACE TREATMENT OF A SKIRT PORTION OF A PISTON FOR AN INTERNAL COMBUSTION ENGINE AND A PISTON FOR AN INTERNAL COMBUSTION ENGINE - A piston allowing a lubrication layer of a resin coating with a low friction coefficient to be tightly adhered to a skirt portion of a piston for an internal combustion engine, with low friction, superior wear resistance, and superior anti-seizing properties and that can reduce wear of a cylinder inner wall even if the lubrication layer is peeled off or abraded, is provided. Metal or ceramic fine particles having an average particle diameter of 20 μm to 400 μm are injected with compressed air or compressed nitrogen as a mixture fluid onto the skirt portion of the piston, made of an aluminum alloy and produced by a method such as casting or forging, at an injection speed of 80 m/s or more or an injection pressure of 0.2 MPa or more to be collided with the skirt portion, thereby uniformly making a microstructure of a piston base material fine-grained in a depth range of 1 μm to 15 μm from a surface of the skirt portion and forming a modified layer with an activated surface. A lubrication layer is formed on the modified layer, for example, by applying a resin with a low friction coefficient, while a surface of the modified layer is being activated. | 04-08-2010 |
| 20110113956 | PISTON HAVING TWISTED SKIRT PANELS - A piston assembly is disclosed herein. The piston assembly is integrally formed and unitary and is centered on a central longitudinal axis. The piston assembly includes a head with ring belt having a plurality of ring grooves. The piston assembly also includes first and second skirts, each having a top edge and a bottom edge being radially narrower than the top edge. The skirts also include first and second side edges. The piston assembly also includes first and second pin bosses spaced radially inward from the ring belt to define a short-pin support arrangement. The pin bosses include respective first and second pin bores axially aligned on a pin bore axis perpendicular to the central longitudinal axis. The piston assembly also includes a plurality of panels, each extending between one of the pin bosses and one of the skirts. Each of the panels include a top portion spaced closest to the head and bottom portion spaced furthest the head and a middle portion disposed substantially equally spaced from the top and bottom portions. Each of the panels twists along its length such that a ratio defined by a first distance between the top portion and a first plane perpendicular to the pin bore axis over a second distance between the bottom portion and the first plane increases along at least part of the length. | 05-19-2011 |
| 20120024149 | DIE CASTING PISTON AND RING ASSEMBLY - The invention relates to a die casting ring ( | 02-02-2012 |
| 20120297973 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-29-2012 |
| 20130068095 | PISTON HEAD WITH SEALING ARRANGEMENT - A sanitary piston head with a body, said piston head having a fluid-contact end and a drive end and comprising a resilient sealing skirt arranged to provide sealing abutment against the inner wall of a cylinder when said piston head is inserted in said cylinder, wherein the resilient sealing skirt is biased in the sealing direction by a radially biasing element. | 03-21-2013 |
| 20130213219 | PISTON RING FOR AN INTERNAL COMBUSTION ENGINE - A power cylinder assembly for an internal combustion engine is provided. The power cylinder assembly includes a cylinder wall having a channel formed therein and a piston body with a skirt. A piston ring is seated within the channel of the cylinder wall and is sealed against the skirt of the piston body. Specifically, the piston ring has a ring body with an inner face that presents two radially inwardly extending ridges spaced axially from one another by a valley region, and the outer face presents a groove which receives a spring to bias the ridges into sliding engagement with the outer surface of the skirt of the piston body. The ring body also has at least one oil drainage port which extends radially between the valley region of the inner surface and the groove of the outer face for conveying oil from between the ridges into the groove. | 08-22-2013 |
| 20130213220 | PISTON RING FOR AN INTERNAL COMBUSTION ENGINE - A piston ring for sealing a cylinder wall to a piston body is provided. The piston ring includes a ring body that extends about an axis and has inner and outer faces. The inner face presents a pair of ridges that extend in a radially inward direction, and the outer face presents a groove. A spring of an elastomeric material substantially circumferentially surrounds the ring body and is seated in the groove on the inner face. The spring biases the ring body in the radially inward direction to seal the ridges against the piston body. The ring body also has at least one oil drainage port which extends at an angle relative to the radially inward direction from the inner face to a location on the outer face on one axial side of the spring for conveying oil out of a space between the ridges. | 08-22-2013 |
| 20130213221 | PISTON RING FOR AN INTERNAL COMBUSTION ENGINE - A piston assembly including a piston body and a piston ring is provided. The piston body has a skirt, a portion of which extends circumferentially continuously and has a skirt diameter. The piston ring has a ring body which extends through at least one revolution in a generally helical shape when in a relaxed condition. The ring body also has an inner face, and when in the relaxed condition, the inner face presents a ring diameter which is less than the skirt diameter. The ring body circumferentially surrounds the skirt of the piston body, thereby causing the inner face to be biased into engagement with the outer surface of the circumferentially continuous portion of the skirt of the piston body to establish a dynamic seal between the ring body and the piston body. | 08-22-2013 |
| 20130213222 | PISTON RING FOR AN INTERNAL COMBUSTION ENGINE - A piston ring for sealing a cylinder wall to a piston body is provided. The piston ring includes a ring body of an elastically deformable material which extends substantially circumferentially around an axis and has an inner face that faces the axis. The inner face includes a plurality of axially spaced and radially inwardly extending contact features. The ring body configured to bias the contact features into engagement with the piston body to establish a seal therebetween. At least one of the contact features extends substantially continuously around a circumference for establishing a substantially continuous seal around the piston body, and at least one of the contact features is non-continuous and has at least one recessed area for allowing the passage of oil and gas therethrough. | 08-22-2013 |
| 20140000453 | Piston with Cooling Gallery and Closed Collar Chamber | 01-02-2014 |
| 20140102294 | PISTON WITH COOLING GALLERY AND COOLING GALLERY FINS - A piston may include a piston crown including radially inner and outer crown mating surfaces, the crown defining at least in part a cooling gallery extending about a periphery of the crown. The piston may include a piston skirt including a pair of oppositely disposed pin bosses, the pin bosses each defining a piston pin bore. The piston skirt may have a radially inner skirt mating surface cooperating along a radially inner interface region with the radially inner crown mating surface, and a radially outer skirt mating surface cooperating along a radially outer interface region with the radially outer crown mating surface such that the cooling gallery is substantially enclosed. The piston may include at least one cooling fin extending from an interior surface of the cooling gallery. | 04-17-2014 |
| 20140208941 | STEEL PISTON WITH FOURTH LAND GUIDANCE AND IMPROVED FRICTION CHARACTERISTICS - Steel pistons used in many internal combustion engines are generally composed of a skirt and a crown. The skirt's function is to reduce the lateral and rotational movement of the piston in the cylinder while the engine is in operation. Lateral and rotational frictional forces imparted to a piston during engine operation cause the piston to scrape off the lubricating oil film present on the cylinder wall. The reduced oil film thickness increases piston and cylinder wall wear due to metal to metal contact. The subsequent metal to metal contact produces a phenomenon called scuffing. This disclosure incorporates several design modifications to the piston and results in a significant reduction of the lateral and rotational motion of the piston during engine operation. The reduction of piston motion reduces the amount of oil film removed from the cylinder wall and increases lubrication efficiency. The Increased lubrication efficiency realized reduces frictional wear power loss and scuffing. | 07-31-2014 |
| 20140216246 | PISTON - A piston has a piston crown, a piston pin support that extends from the piston crown, and a skirt wall that is connected to the piston crown. The skirt wall has two tubular pieces which are concentrically arranged relative to each other and each of which is connected to the piston crown in the circumferential region of the piston crown. A hollow space cavity is formed between the tubular pieces and a coolant is disposed in the cavity. | 08-07-2014 |
| 20140260961 | Piston Pinbore Busing With Anti-Rotation Feature - A piston assembly according to an aspect of the present disclosure includes a piston and a bushing. The piston includes a piston skirt, side panels, and a piston crown. The side panels define a pin bore for receiving a wrist pin. The pin bore has an inner surface including a cylindrical section and a flat section. The bushing is fixed within the pin bore and has a hollow cylindrical body with an outer surface including a cylindrical section and a flat section. The cylindrical section of the bushing engages the cylindrical section of the pin bore. The flat section of the bushing engages the flat section of the pin bore. | 09-18-2014 |
| 20140345455 | Thermal Barrier for a Piston - It is important to maintain the temperature in the ring pack area of the piston of an internal combustion engine below about 270° C. to maintain proper ring function and lubrication. Disclosed is a piston with a heat barrier groove between the piston top and the ring pack and a method to construct such a piston. The heat barrier groove extends inwardly toward the center of the piston a greater distance than the compression ring grooves. In one embodiment, a low thermal conductivity material is placed in the inner portion of the heat barrier groove and a split ring is place in the outer portion. In another embodiment, a gas is provided in the inner portion and the split ring is welded to the piston so that the inner portion of the heat barrier groove is sealed, i.e., welding at the upper and lower edges and at the gap. | 11-27-2014 |
| 20150114219 | DIE CASTING PISTON AND RING ASSEMBLY - The invention relates to a die casting ring ( | 04-30-2015 |
| 092216000 | Plural separable parts | 1 |
| 092220000 | Threaded fastener | 1 |
| 20130333557 | LIGHTWEIGHT ENGINE POWER CELL ASSEMBLY - Exemplary power cell assemblies and methods of making the same are disclosed. An exemplary power cell assembly may include a piston crown and connecting rod. In an exemplary illustration, a power cell assembly includes a piston crown having a ringland extending circumferentially about a combustion bowl. The boss portions may each include inwardly extending shoulders defining arcuate crown running surfaces. The power cell assembly may further include a connecting rod having a shank and an upper end received in a cavity of the crown. The upper end of the connecting rod may define arcuate connecting rod running surfaces extending away from the shank. The crown running surfaces and connecting rod running surfaces generally allow the connecting rod to pivot with respect to the piston crown about an axis of rotation that extends from one of the boss portions to the other of the boss portions. | 12-19-2013 |
| 092222000 | Specific or diverse material; or welded, brazed or soldered joint | 3 |
| 20080314241 | Piston Comprising a Circumferential Radial Recess Located Below an Annular Groove - A piston having a top part and an adjacent shaft part. The top part of the piston is provided with a field of rings encompassing at least one annular groove. A circumferential radial recess is located in the region between the upper edge of the shaft part and the annular groove. The upper diameter of the recess is smaller than the lower diameter of the recess. | 12-25-2008 |
| 092223000 | Coated | 1 |
| 20100251886 | Method Of Fitting A Piston For Use In An Internal Combustion Engine - A piston assembly including a piston body having a crown and a skirt, the skirt including at least a major thrust face and a minor thrust face, wherein the piston body defines a bore between the major thrust face and the minor thrust face, and a wear coating applied to the major thrust face and the minor thrust face, the wear coating having a cured thickness of at least about 30 microns. | 10-07-2010 |
| 092231000 | Welded, brazed or soldered (260) | 1 |
| 20130068096 | LASER WELDED PISTON ASSEMBLY - An exemplary piston may include a piston body having radially inner and outer body mating surfaces. The piston may further include a cooling gallery ring cooperating with the piston body to form a continuous upper combustion bowl surface and a cooling gallery. The cooling gallery ring may have radially inner and outer ring mating surfaces abutted along their corresponding radially inner and outer body mating surfaces, such that the cooling gallery is substantially enclosed. The piston body and cooling gallery ring may be joined together along the radially inner and radially outer interface regions to form a generally one-piece piston assembly. The radially outer interface region may be elongated in a direction parallel to the piston axis, e.g., facilitating a laser welding joining process. | 03-21-2013 |
| 092233000 | Oval-shaped skirt portion | 1 |
| 20140216247 | Piston With Improved Side Loading Resistance - A piston including a crown and at least one pin tower coupled to the crown. The pin tower has an opening therein configured to receive a pin therein along a pin axis. The piston further includes a skirt extending generally away from the crown, the skirt including a pair of opposed skirt panel portions. The skirt has a generally non-circular oval shape having a major axis extending generally parallel to the pin axis, wherein the panel portions are offset from the major axis. | 08-07-2014 |
| 092239000 | With rib or strut means on piston part | 2 |
| 20090056534 | Piston for an Internal Combustion Engine - The invention relates to a piston ( | 03-05-2009 |
| 20100139480 | PISTON - A piston with transverse-rib through holes formed easily therein for reducing the cost of manufacturing. A piston includes a pair of mutually opposed longitudinal ribs individually formed with piston pin bosses interconnecting a pair of piston skirt portions on a back side of a piston head. A pair of transverse ribs interconnect the mutually opposed longitudinal ribs with the transverse ribs. The pair of transverse ribs are formed with transverse-rib through holes at places proximal to the back side of the piston head. A skirt opening is formed by cutting away a part of the piston skirt portion that is opposed to the transverse rib and faces the transverse-rib through hole. | 06-10-2010 |
