Abstract: An oil wiper ring is provided having two circumferential shoulders, the running surfaces whereof are outwardly curved, wherein the shoulder of the combustion chamber side has an axial height greater by at least a factor of 2 than the axial height of the shoulder on the crankcase side and wherein the should on the combustion chamber side has an asymmetrical crowning.

Abstract: A hydraulic device includes a cylinder, a piston that is able to move in the cylinder, and a segment which is interposed between the cylinder and the piston and which includes at least one leakage duct that is configured to generate a hydraulic film, between the segment and the piston, reducing friction and to orient a hydraulic flow leaving the leakage duct which causes the segment to rotate about the piston.

Abstract: The present disclosure provides a sealing ring assembly having a sealing ring and a reinforcement, configured to seal a high-pressure region from a lower pressure region of a piston and cylinder device. The sealing ring may be segmented, and a metal layer, wire, or other reinforcement may be affixed to the ring. The reinforcement is placed into tension against the sealing ring, which is correspondingly placed into compression. The composite structure of a relatively brittle sealing ring and reinforcement provides for reduced tensile loads in the sealing ring, thus extending life and reducing the likelihood of failure. The brittle portion of the sealing ring assembly may include a polymer or ceramic such as graphite, which is relatively less strong in tension than compression.

Abstract: A side rail (1) is formed in a sprit ring shape with an opening (10) and to be mounted on a space expander (2) in an annular shape to constitute, together with the space expander (2), a multi-piece oil ring (3) used in an internal combustion engine. The side rail (1) includes an outer peripheral surface (14) facing radially outward, an inner peripheral surface (13) facing radially inward, a first axial surface (11) facing a crankcase, a second axial surface (12) facing a combustion chamber and parallel to the first axial surface (11), and a protrusion (20) formed on the outer peripheral surface (14) in a position offset from an intermediate position between the first axial surface (11) and the second axial surface (12) toward the first axial surface (11) and protruding radially outward from the outer peripheral surface (14).

Abstract: An internal combustion engine may include an engine block, a cylinder within the engine block, and a piston within the cylinder. The piston may have an outer peripheral wall, and a groove in the outer peripheral wall of the piston may have a first edge and a second edge spaced from the first edge. The piston may have a piston ring in the groove, and the piston ring may have a shape that meanders within the groove, such that the shape of the piston ring differs from a shape of the groove and such that the piston ring does not substantially fill the groove. The piston ring may be constructed of a material that when subjected to heat causes a shape of the meanderings to change, thereby enabling the piston ring to expand in an axial direction of the piston, between the edges of the groove.

Abstract: A power cylinder system for a reciprocating engine includes a piston with a top-most groove extending circumferentially about the piston. The top-most groove includes one or more channels spaced apart circumferentially about the top-most groove and extending inward from an outer perimeter of the piston assembly. The system also includes a ring positioned in the top-most groove, the ring including a top face, a bottom face, an inner circumferential face, and an outer circumferential face that tapers between the top face and the bottom face. A space is defined between a portion of the top-most groove and the inner circumferential face of the ring, and the space is in fluid communication with the one or more radial channels.

Abstract: A seal ring 100 is configured by the combination of a first divided body 100A on a high pressure side and a second divided body 100B on a low pressure side with respect to an axis direction. The seal ring that stabilizes sealing performance while reducing rotary torque and including a recessed section 140 provided centrally in a width direction and extending in a circumferential direction and a pair of raised sections 150 provided on both sides of the recessed section 140. A through hole 141 a is provided so as to lead to a bottom surface of the recessed section 140 from an inner peripheral surface side and allows a sealed fluid to be introduced into the recessed section 140 from the inner peripheral surface side.

Abstract: An intershaft seal system capable of communicating a balanced pressure profile onto forward and aft faces along a piston ring is presented. The seal system includes forward and aft mating rings and a piston ring. Mating rings include a plurality of divergent flow grooves adjacent to the piston ring. Each divergent flow groove includes a pair of grooves which intersect at and are substantially symmetric about an apex. The piston ring includes channels which direct a fluid from a high pressure region upward or downward and through the piston ring and onto the divergent flow grooves. The divergent flow grooves separate the fluid in a symmetrically divergent fashion prior to communication onto the piston ring. The divergent flow grooves communicate a substantially symmetric pressure force onto each side of the piston ring so as to minimize twist thereof, thus reducing wear along the piston ring and increasing seal life.

Abstract: A piston rod and cylinder seal device includes a cylinder defining a piston chamber extending between first and second cylinder heads. The second cylinder head has a spud receiving bore, a pressure passage communicating with the spud receiving bore, and a bore supply/vent passage. A piston is disposed in the piston chamber. A piston rod is connected to the piston having a piston rod spud including a shaft receiving bore. A tubular shaft connected to the second cylinder head in the spud receiving bore has a passage communicating with the bore supply/vent passage. The shaft is sealingly received in the shaft receiving bore when the piston rod spud is received in the spud receiving bore preventing pressurized air in the bore supply/vent passage from entering the spud receiving bore. The shaft is positioned outside the shaft receiving bore when the piston rod spud is outside the spud receiving bore.

Abstract: A check seal (53) for discharging working oil scraped off a piston rod (3) by an oil lip (52b) into an oil pool (A) of a hydraulic shock absorber to an oil reservoir (R) is disposed on the outside of the oil pool (A). The check seal (53) comprises an annular seat surface (4d) and an annular lip (53a) seated resiliently on the seat surface (4d). The annular seat surface (4d) comprises an annular main rib (11) and an annular inner rib (12), both of which project toward the annular lip (53a), such that an annular groove (21) is formed between the main rib (11) and the inner rib (12). By providing a pressure introducing passage (12a) to introduce a pressure inside the inner rib (12) to the annular groove (21), the check seal (53) exhibits a high working oil discharging performance and a high working oil sealing performance.

Abstract: A piston has a body with a first circumferentially disposed groove. A first ring is movably disposed within the first groove. The first ring defines an inner circumferential groove. A blocking ring is at least partially located in the groove of the first ring and the groove of the piston. One or more vent passages may connect a first volume in the piston to a second volume outside the piston.

Abstract: A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring groove also has an upper inner surface and a lower inner surface, both orthogonal to the axial direction of the piston; a radially inward-most, bottom surface connecting the upper and lower inner surfaces; and oil drain holes, each having an opening thereof located on the bottom surface. The ring groove has an axial width slightly greater than the width of the two-piece oil ring.

Abstract: Refrigerant gas at a few psi higher than suction is supplied via labyrinth or annular groove type seals located between the suction side bearings and suction and between the suction side motor bearing and the motor. The buffer gas flow divides with part going to suction and part to a drain along the oil flowing from the bearings.

Abstract: A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring groove also has an upper inner surface and a lower inner surface, both orthogonal to the axial direction of the piston; a radially inward-most, bottom surface connecting the upper and lower inner surfaces; and oil drain holes, each having an opening thereof located on the bottom surface. The ring groove has an axial width slightly greater than the width of the two-piece oil ring.

Abstract: A method and device for a fit to size assembly of components or machine parts is provided in which fixed or relatively moving machine parts are sealed against inlet and outlet of a fluid material. A sealing member used for this sealing cannot be put in a position during the assembly, which is required for a fit-to-size assembly. The assembly includes an elastic sealing member inserted into an annular groove that is made in one of the machine parts being sealed relative to another part. The groove communicates with a sealing seat and an overpressure is built up in a space in the groove which is sealed by the sealing member through a passage open to the outside. The overpressure causes the sealing member to move to the sealing seat.

Abstract: A seal assembly (22) for sealing a pressurized gaseous product includes, a pair of seals (24,26) spaced axially to provide a chamber (28) therebetween, a gas seal (24) being disposed on the inboard side of the seal assembly (22) between the sealed gaseous product and the chamber (28), an inlet (38) opening to the side of the gas seal (24) exposed to the gaseous product, the inlet (38) being connected to a supply of clean gas, the chamber (38) defined between the seals (24,26) being connected to a reservoir (50), the reservoir (50) being connected back to inlet (38) via a pressure intensifier (70) and the reservoir (50) being connected to the supply of clean gas, so that additional clean gas may be supplied thereto, when pressure in the reservoir (50) falls below a predetermined minimum value.

Abstract: A separating piston for a vibration damping system with a cylinder which is filled partly with damping fluid and partly with pressure gas and with a separating piston which is arranged in the cylinder and divides the pressure gas space from the fluid space in a sealing manner via a seal. The separating piston is guided in the cylinder by a guide, wherein the separating piston is provided with an additional guide between the seal and the end side facing the pressure gas space. A chamber which is open relative to the inner wall of the cylinder is arranged in the area between the seal and the additional guide.

Abstract: A piston ring device for use in a combustion engine of a vehicle includes a compressing ring, a zigzag-shape oil ring and an auxiliary ring which is piled up from the auxiliary ring and combined with each other, so that the piston ring device can be easily assembled and disassembled and reducing a rubbing loss so as to minimize any power loss.

Abstract: In order to prevent penetration of lubricant into the combustion chamber, a piston for an internal combustion engine has a labyrinthine pressure equalizing passage between the combustion chamber and the crankcase. For this purpose, the piston ring closest to the combustion chamber is guided with relatively large axial play in the matching annular groove. The piston rings located farther from the combustion chamber are each provided with recesses that connect the annular chamber between the adjacent piston rings with the bottom of the respective annular groove. A bore is also provided in the annular groove that is farthest from the combustion chamber, the bore connecting the bottom of the annular groove with an interior chamber defined in the piston. In this way, the pressure can equalize between the combustion chamber and the crankcase.