Abstract: A combination of piston rings assembled to a piston of an internal combustion engine includes four compression rings. An outer peripheral surface of a first compression ring includes a barrel surface, an outer peripheral surface of a second compression ring includes an outer peripheral end portion and a taper surface, an outer peripheral surface of a third compression ring includes an outer peripheral end portion and a taper surface, and an outer peripheral surface of a fourth compression ring includes an outer peripheral end portion and a taper surface.

Abstract: Systems and methods are disclosed related to determining and providing contextual information associated with a meeting based in part by parsing text from a meeting invitation or calendar entry. A voice-capturing device may receive audio data before or during a meeting that includes an invocation phrase used to invoke a voice-based functionality. A response may be generated by the voice-capturing device or an associated service provider system based on the contextual information determined from the parsed meeting invitation and/or related sources.

Abstract: A stepped piston ring (2) includes a ring outer side (5), an upper ring flank (6), and a lower ring flank (8). The ring outer side (5) on the upper edge has a notch (10, so that only a lower portion of the ring outer side (5) forms a contact surface (4).

Abstract: A piston ring includes an annular main body 2 having a side surface 2a and a side surface 2b, and an inner peripheral surface 2c and an outer peripheral surface 2d, wherein in the main body 2, a cutout section 21 is provided in a corner section 31 formed by the side surface 2b and the outer peripheral surface 2d. The cutout section 21 has a first surface 21a and a second surface 21b. An angle ?1 formed by the first surface 21a and the side surface 2b is an obtuse angle, and a corner section 32 formed by the second surface 21b and the outer peripheral surface 2d is located between the side surface 2b and the side surface 2a in a width direction of the main body 2.

Abstract: A compression ring for an engine piston includes an upper and lower face, and an inner face positioned between the upper and lower faces along an inner diameter of the ring. An outer face is positioned between the upper and lower faces along an outer diameter of the ring and is formed by a continuous curve along the axial direction of the ring. The continuous curve has first and second convex surfaces connected by a concave surface with each convex surface defined by first and second radii, respectively. A method of forming a piston compression ring includes machining an outer face of the ring to form a continuous curve along an axial direction of the ring, where the continuous curve has a first convex section and a second convex section connected by an intermediate section.

Abstract: A multi-piece oil ring includes an oil ring main member in which two rails are connected together by a columnar part and which has a roughly I-shaped cross section; and a coil expander disposed in an inner circumferential groove formed on the inner circumferential surface of the columnar. Each rail in the oil ring main member possesses a sliding section protuberance whose tip possesses a jutting portion. The axial length of the jutting portion is 0.02-0.18 mm. The change rate of the axial length of the individual jutting portion is in the range of 0 to 80% at least in a region of from its sliding surface to be faced to a cylinder, which is positioned at the tip of the jutting portion, to a position of 0.03 mm away from the aforementioned sliding surface in the radial direction of the oil ring main member.

Abstract: 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.

Abstract: A brake cylinder includes a pressure medium actuated brake piston delimiting a brake chamber and connected to a brake piston rod. The brake piston, together with the piston rod, swivels into positions tilted from a center axis of the brake cylinder during an actuation stroke. The brake piston is rigid and has a guide surface in the shape of a spherical surface of an imaginary sphere on its radially outer peripheral surface. The guide surface is guided along a radially inner cylinder wall of the brake cylinder with the center of the sphere lying on the center axis of the brake cylinder. The brake piston further has at least one elastic sealing element radially displaceable in a radially outer annular groove of the brake piston and delimiting an annular space together with a groove base of the annular groove on its side facing away from the radially inner cylinder wall.

Abstract: An oil-reserving piston ring includes an upper wedge ring (100a,200a) and a lower wedge ring (100b,200b) jointed with each other. The upper wedge ring (100a,200a) and the lower wedge ring (100b,200b) are each arranged with an opening, the upper wedge ring (100a,200a) has a first working surface (101,201) contacting with the wall of a cylinder, the lower wedge ring (100b,200b) has a second working surface (102,202) contacting with the wall of the cylinder, and at least one of the first working surface (101,201) and the second working surface (102,202) is arranged with at least one oil-reserving groove (105,106,205,206). Also provided is a piston (600) with only one piston ring slot which is used for arranging the oil-reserving piston ring. The oil-reserving piston ring has a good lubricating property and seal, and is high in reliability.

Abstract: A sealing device in which a good lubricating oil film is formed along the entire circumference of a sliding surface. The sealing device (1) is fitted in an annular groove formed in either of two elements that are a housing having a shaft hole and a shaft inserted through the shaft hole, and the sealing device (1) seals an annular gap between the two elements. The sealing device (1) has a seal ring (2) sliding against the other element by relative axial movements of the two elements. In the seal ring (2), on each of axially opposite ends of a sliding surface (20) sliding against the other element, there are formed grooves (22) extending from an end surface (21) of the seal ring (2) toward the axial center of a sliding surface (20).

Abstract: The object of the present invention is a piston for cold chamber die-casting machines comprising a body and at least one sealing band mounted around said body, wherein said body and said band are provided with coupling means suitable for concurrently obtaining both an angular locking and an axial locking of the band to the piston body.

Abstract: A dashpot piston in halves, the face of each resting against that of the other. The piston can be fastened to the end of a piston rod either directly or by way of a connector. Each half (1 & 2) is provided with a depression (7) along the circumference remote from the face of the other, creating a continuous groove (8) with a shorter diameter and accommodating a piston-assembly ring (9). Manufacture is facilitated by the inclusion of at least one resilient supporting ring (11) between the piston-assembly ring and the base of the groove.

Abstract: A number of embodiments of piston sealing arrangements for shock absorbers having a hydraulic cylinder in which a piston is slidably supported to define a pair of fluid chambers. The piston is provided with a peripheral groove in which a sealing piston ring is provided. A number of different communicating passage arrangements are formed in the piston ring that communicate the exterior surface of the piston ring which engages the cylinder bore with the interior surface of the piston ring which faces the ring groove so as to balance the pressure therebetween. In each embodiment a seal is provided between the piston ring groove and the piston ring so as to preclude fluid flow from one fluid chamber to the other through the piston ring groove and the communicating passage arrangement.