| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 277459000 | Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel | 9 |
| 20110266753 | SEALING SLEEVE - A sealing sleeve is disclosed for sealing between piston and cylinder wall in internal combustion engines. In at least one embodiment, it includes a height in the direction of piston movement that is at least three times as large as its width in the radial direction of the cylinder. Further, it includes a pressurized annular cut out. | 11-03-2011 |
| 20130234400 | PISTON RING - A piston ring reduces reciprocating friction between a piston and an inner wall surface of a cylinder, while maintaining reduction effect of the reciprocating friction. The piston ring is mounted in a ring groove of the piston, and slides against the inner wall surface of a cylinder liner or a cylinder. The piston ring includes: plural fine recessed portions formed in a barrel width region on an outer peripheral sliding surface of the piston ring; and a non-recessed portion area where no recessed portions are formed in the barrel width region. The non-recessed portion area is configured to have an area percentage within a range from 20-85% in the barrel width region where an area percentage of the barrel width region before the recessed portions are formed is defined to be 100%. The non-recessed portion area exists through an entire cross section in an axial direction of the barrel width. | 09-12-2013 |
| 277460000 | Circumferential groove, channel, recess, or bevel | 6 |
| 20100001475 | Piston ring seal - This invention describes a piston ring consisted of a “C” shaped spiraled wire acting as an expander for a seal ring of a softer material such as Teflon or Nylon; also acting as a split sealing device between two adjacent surfaces. | 01-07-2010 |
| 20100117305 | PISTON RING FOR THE PISTON OF AN INTERNAL COMBUSTION ENGINE - The invention relates to a piston ring ( | 05-13-2010 |
| 20100176557 | OIL WIPER RING - An oil wiper ring, comprising a body with a radially external running surface, an inner circumferential surface and an upper and lower face, and which possesses at least two slide ribs, which may be provided with a wear-resistant layer, such ribs becoming conically thinner, in the radial direction of their end faces, and which are opposite a sliding mating surface, such that they proceed from the body, at a specifiable angle, in order to form an angled side face, so that the free end of each slide rib, commencing in the region at the oil chamber side, is shaped to slope towards an area at the combustion chamber side, such that the associated transitional areas, on the one hand, from the region of the circumferential slide rib towards the angled side faces, and on the other hand, from the angled side faces to the piston ring body, are rounded, i.e. have predetermined radii. | 07-15-2010 |
| 20120112418 | OIL CONTROL RING WITH FERROUS BODY LESS THAN 2.0 MILLIMETERS HIGH FOR INTERNAL COMBUSTION ENGINES - There is described an oil control ring ( | 05-10-2012 |
| 20130147124 | OIL-RESERVING PISTON RING - An oil-reserving piston ring includes an upper wedge ring ( | 06-13-2013 |
| 20150300492 | PISTON RING WITH A PERIODICALLY VARYING GROOVE - A piston ring having an outer running face, two flanks and an inner circumferential face is provided, the running face of which has profiling with a groove. The groove is arranged between two running face sections in relation to the cross section of the piston ring. The two running face sections are spaced apart from each other and substantially convexly curved and each have an apex. The groove has a periodically varying depth and a periodically varying width, and the number of periods of the course of the depth and the number of periods of the course of the width are equal. | 10-22-2015 |
| 277465000 | Circumferentially spaced slots, pockets, grooves, channels, recesses, or bevels | 1 |
| 20120061920 | OIL RING MECHANISM OF A PISTON - An oil ring mechanism of a piston includes a circumferential ring groove formed in an outer peripheral surface of the piston, and a two-piece oil ring having a ring-shaped ring main body that is arranged in the ring groove and urged in the outer peripheral direction inside the ring groove by a coil expander arranged on the inner peripheral side of the oil ring main body. On lower side surface on a crankcase side of a side wall surface of the ring groove that is on the opposite side of the ring groove from an engine combustion chamber, first and second recessed portions that reduce the abutment area where a lower surface of the ring main body abuts against the lower side surface formed in a lower side abutment surface that serves as a surface for abutting against the lower surface of the ring main body. | 03-15-2012 |
