INTERNAL COMBUSTION ENGINE OIL RING

WIPO Patent Application WO/2020/067539

A1

Provided is an internal combustion engine oil ring with which it is possible to reduce undulations generated during manufacture of the oil ring, and to improve the oil sealing performance, while maintaining an effect of reducing oil consumption. An internal combustion engine oil ring (1) is provided with an oil ring main body (2) in which the cross-sectional shape of an oil ring is substantially I-shaped, and a coil expander (3) disposed on the inner circumferential side of the oil ring main body (2), wherein: the oil ring main body (2) is configured from a first rail (5) and a second rail (6) which are in contact with a cylinder inner wall surface, and a web (4) provided with a plurality of oil return holes (7) for allowing oil that has been scraped off the inner wall surface of the cylinder by the first rail (5) and the second rail (6) to flow down toward a piston rear surface; and undulations in at least one of a part (2f) of an inner circumferential side of the oil ring main body (2) excluding an inner circumferential groove (2e) and an oil return groove (2d), and a part of an outer circumferential side of the oil ring main body (2) excluding sliding surfaces (8A) are at most equal to 6.0 μm.

JPS54133254	PISTON RING AND ITS MANUFACTURING METHOD
JPS5334047	SPACER EXPANDER FOR PISTON OIL ADJUSTING RING
WO/2011/072941	PISTON HAVING PISTON RINGS AND SUPPORT RINGS

ITO MICHIHIRO (JP)
HASUMI RYOSUKE (JP)
YAZAWA TSUTOMU (JP)
MAKITA TAKESHI (JP)

PCT/JP2019/038419

April 02, 2020

September 27, 2019

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NIPPON PISTON RING CO LTD (JP)

F16J9/20; F02F5/00; F16J9/06

WO2011132679A1	2011-10-27
WO2011152114A1	2011-12-08
WO2016038916A1	2016-03-17

JPH0478375A

1992-03-12

EIKOH PATENT FIRM, P.C. (JP)

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