About 11 results
https://drivepatents.com/patents/1386287 · 15 Apr 2026
The present invention relates to a piston ring with a trapezoidal opening, used for being sleeved on a piston ring groove of a piston and comprising a piston ring main body with an opening, wherein the piston ring main body is processed with at least one t...
https://drivepatents.com/patents/1388333 · 22 Oct 2025
An outer circumferential surface of a piston ring has a cut surface forming a notched portion between an outer circumferential end surface and a lower surface, the cut surface including a first surface between the outer circumferential end surface and a bo...
https://drivepatents.com/patents/1394750 · 20 Aug 2025
A side rail forms an oil control ring together with a spacer expander, and includes: an outer peripheral surface; an inner peripheral surface having a vertically symmetrical shape in an axial cross section; a first side surface; and a second side surface. ...
https://drivepatents.com/patents/1398773 · 25 Dec 2024
A combination of piston rings assembled to a piston includes a first compression ring, a second compression ring, a third compression ring and an oil ring. When an axial width of the first compression ring is h1(1), an axial width of the second compression...
https://drivepatents.com/patents/987412 · 14 Aug 2013
An engine in which an oil consumption and a leakage of blow-by gas can be stably reduced for a long period of time has a piston including a first land 3, a first ring groove 4, a second land 5, a second ring groove 6, a third land 7, a third ring groove 8,...
https://drivepatents.com/patents/989429 · 26 Jun 2013
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 ...
https://drivepatents.com/patents/999999 · 25 Jul 2012
The oil scraper ring (1) has a retaining ring (2) and a scraper (3) with a scraper disk (3a). The scraper is arranged in the retaining ring such that the scraper disk is aligned against the center of the oil scraper ring for scraping off the oil in a pisto...
https://drivepatents.com/patents/1009505 · 14 Sep 2011
A combination oil ring prevented from freeze up of the side rails and spacer expander, that is, a combination oil ring of the present invention provided with a top and bottom pair of side rails 11 and 12 and a spacer expander 13 having large numbers of top...
https://drivepatents.com/patents/1070796 · 18 Jan 2006
An oil ring 1 comprises an annular oil ring body 10 having a pair of rail portions 12 at its axially upper and lower portions and butt ends, and a coil expander 20 assembled in the inner periphery of the oil ring body 10. The cross-sectional profile taken ...
https://drivepatents.com/patents/1072536 · 16 Nov 2005
In mounting a combined oil control ring in a ring groove formed in a piston, the combined oil control ring is mounted in a form that an opening between but ends of an oil ring body is widened. In such an operation, it is likely that a coil expander falls o...