Title:
内燃機関用オイルリング
Document Type and Number:
Japanese Patent JP7182097
Kind Code:
B2
Abstract:
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.
Inventors:
Tomohiro Ito
Ryosuke Hasumi
Yazawa Tsutomu
Go Makita
Ryosuke Hasumi
Yazawa Tsutomu
Go Makita
Application Number:
JP2020549495A
Publication Date:
December 02, 2022
Filing Date:
September 27, 2019
Export Citation:
Assignee:
Nippon Piston Ring Co., Ltd.
International Classes:
F16J9/20; F02F5/00; F16J9/06; F16J9/26
Foreign References:
| WO2011132679A1 | ||||
| WO2011040066A1 |
Attorney, Agent or Firm:
Patent Attorney Corporation Eiko Office
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