| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 277467000 | Particular piston ring expander | 16 |
| 20090243225 | Wire material for coil expander and coil expander - A wire material for a coil expander capable of manufacturing a coil expander that is unlikely to cause disadvantages such as abnormal wear and resultant reduction in strength. The wire material for a coil expander is used for a coil expander of a combination piston ring having a piston ring and the coil expander for pressing and urging the piston ring outward in the radial direction thereof, wherein a cross-sectional shape thereof is a rectangular shape, and when the coil expander is formed by using the wire material for a coil expander, the surface of the wire material for a coil expander, constituting an outer peripheral surface of the coil expander, is formed into a convex curved shape. | 10-01-2009 |
| 20100171273 | MULTI-RAIL PISTON RING - A piston ring assembly includes a ring or rail defining a seal surface configured to seal against a piston bore surface of an engine. The seal surface defines a radially outer periphery. The oil control rail assembly further includes two positioning rings. A first one of the positioning rings is disposed axially above the oil control rail and a second one of the positioning rings is disposed axially below the oil control rail. Each of the positioning rings defines an outermost periphery of the positioning ring that is disposed radially inward with respect to the seal surface of the oil control rail. The outermost peripheries of the positioning rings thus generally do not contact a bore surface that is contacted by the seal surface of the oil control rail. | 07-08-2010 |
| 20130049305 | INTERNAL COMBUSTION ENGINE OIL RING - An internal combustion engine oil ring which stably retains, for a long period, the function of scraping excess oil from a cylinder inner wall surface and letting the excess oil flow down to an underside of a piston and ensures reduction in the amount of oil consumption when an internal combustion engine is driven. An internal combustion engine oil ring is provided, whose main body includes, along an inner peripheral surface, a coil expander receiving recess having a generally semicircular shape in cross-section in an oil ring axial direction, an inner peripheral surface of the coil expander receiving recess has an oil return groove formed along an inner peripheral direction for smoothly returning scraped oil to an underside of a piston, and an outer peripheral shape of the groove is composed of a straight line and a curved line continuous therewith in cross-section in the oil ring axial direction. | 02-28-2013 |
| 20140246834 | COMBINATION OIL RING - The present invention prevents anchoring between a space expander and a side rail of a combination oil ring. A combination oil ring ( | 09-04-2014 |
| 20140265149 | COMBINED OIL CONTROL RING - To provide a combined oil control ring with a function of preventing the separate rotation of side rails for a long period of time even under fretting fatigue, seating tabs of a spacer expander are provided with substantially longitudinal projections and recesses on their side-rail-pushing surfaces in a circumferential direction, the width m of a bottom surface being larger than the circumferential length m′ of the top surface in each projection, and a surface connecting the top surface to a recess surface having a bulging shape. | 09-18-2014 |
| 277468000 | Separate and other than metal | 2 |
| 20080296848 | ANNULAR SEALING MEMBER WITH ENHANCED HOOP STRENGTH - Apparatus and method for providing a sealing member with enhanced hoop strength. In some embodiments, a valve assembly includes a piston and first means for establishing a fluid-tight seal when the piston is in a closed position and for preventing a blow out condition when the piston is transitioned to an open position. In other embodiments, a sealing member is characterized as an endless annular ring which extends about a central axis, the sealing member comprising an elongated circle cross-sectional shape while the sealing member is maintained in an uncompressed state. In other embodiments, a method comprises extruding a sealing material through an extrusion assembly to form an endless annular ring which extends about a central axis, the extrusion assembly imparting a desired amount of curvilinearity along a longitudinal length of the material to form an orthogonal seam when a leading and trailing edge of the material are adjoined. | 12-04-2008 |
| 20140265150 | PISTONS - Pistons are disclosed herein. An example apparatus includes a piston defining a chamber and a circumferential groove in communication with the chamber. At least a portion of the chamber is to be substantially filled with a fluid. The example apparatus also includes a piston ring disposed in the chamber and the groove. The fluid is to apply a first pressure to the piston ring to enable the piston ring to apply a second pressure to a cylinder wall. The second pressure is to be greater than the first pressure. | 09-18-2014 |
| 277469000 | Bias limiting feature | 1 |
| 20120306159 | MULTI-PART PISTON RING - A multi-part piston ring, containing an at least single-part spring support which is provided with a piston ring joint region and an at least single-part spring element, which is positioned in a groove provided in the region of the inner circumferential face of the spring support, wherein the wall thickness of the spring support is essentially equal in the region of the ends of the spring support facing the piston ring joint and in the rear region of the spring support, and a pocket which extends over a circumferential range of at least 60° and is created by local reduction of the wall thickness of the spring support is provided in each case between the rear region and the piston ring joint ends. | 12-06-2012 |
| 277472000 | Annular expander nested in annular groove of the piston ring | 2 |
| 277473000 | Between piston rings | 1 |
| 20110204575 | Piston ring - A piston ring with an upper part ring having an upper ring surface and with a lower part ring having a lower ring surface, and with a ring spring which is arranged between the part rings and acts with spring force upon these radially outward, characterized in that each of the two part rings has, on its circular-ring surface in each case facing the other part ring, a plurality of elevations arranged so as to be separated from one another by depression regions, with plateau surfaces which are parallel to the ring surfaces and are flat-planar or descend and which have in each case, the ring axis of the respective part ring, toward an inner-flank indentation which emanates, oriented parallel to the ring axis, from the plateau surfaces and runs out toward said spring axis, in each case parallel to the upper and the lower ring surface, and which has a quarter-circle-shaped cross section, the radius rv of said inner-flank indentation being 1 to 10% larger than the outer radius of the circle cross section of the common inner-flank indentation which is formed by the indentations of the part rings jointly forming the piston ring and which has a semicircular cross section. | 08-25-2011 |
| 277474000 | And contacting surfaces therebetween are complementary | 1 |
| 20090273142 | COMBINED OIL RING - A combined oil ring includes an oil ring having upper and lower rails formed integrally at an outer circumferential side of the oil ring to slide on a cylinder wall; a coil expander installed at an inner circumferential side of the oil ring to force the oil ring radially outwards; and a side rail installed at an upper side of the oil ring and having no torsion along an axial direction of the oil ring. | 11-05-2009 |
| 277477000 | Slotted or undulating circular band including inclined or axially facing seat for the piston ring | 4 |
| 20080265518 | PISTON RING AND A FLUID SUCKING/DISCHARGE DEVICE WITH THE PISTON RING - A piston ring is made of high polymers and fits in a circumferential groove of a piston in a cylinder of a compressor or a vacuum pump. A plurality of cuts are formed in the piston ring. When the piston ring is turned inside up or pulled out radially, it is stretched out. The piston ring can easily be fitted in the circumferential groove of the piston to prevent a fluid from leaking through between the piston and the cylinder with sufficient sealing capability. | 10-30-2008 |
| 20150145218 | COMBINED OIL CONTROL RING - A combined oil control ring for automobile engines capable of keeping an excellent oil-controlling function without suffering sticking between a spacer expander and side rails for a long period of operation comprises upper and lower two side rails, and an axially corrugated spacer expander having upper and lower portions; a leg portion connecting each upper portion and each lower portion of the spacer expander having a portion having an inclination angle θ of 15° or more from the axial direction. | 05-28-2015 |
| 277478000 | Axially spaced axially facing seats | 2 |
| 277481000 | U-shaped circular band radially directed either inwardly or outwardly throughout its circumference | 2 |
| 20080309022 | Two-Part Oil Scraper Ring for Internal Combustion Engines - In the case of a two-part oil scraper ring ( | 12-18-2008 |
| 20100164182 | MULTI-PART OIL SCRAPER RING FOR INTERNAL COMBUSTION ENGINES - In the case of a multi-part oil scraper ring ( | 07-01-2010 |
| 277487000 | Segmented | 1 |
| 20140035235 | THREE-PIECE OIL-CONTROL RING FOR AN INTERNAL COMBUSTION ENGINE - A three-piece oil control ring is provided for use in a piston groove of an internal combustion engine. The ring comprises a first annular segment and a second annular segment, associated to an expanding element. The expander has a substantially annular shape and comprises a first end facing the internal wall of the groove when the ring is mounted on the piston and a second opposite end. The ring further comprises an intermediate portion having at least one protrusion for association with the segments. Still further, the first end exhibits first thickness value (E | 02-06-2014 |
| 277488000 | For axially adjacent piston rings | 1 |
| 20090250880 | Oil-control ring for an internal combustion engine - An oil-control ring for an internal combustion engine, to be mounted between the sidewalls of a respective groove ( | 10-08-2009 |
