Title:
Oil ring
Document Type and Number:
Japanese Patent JP6222023
Kind Code:
B2
Abstract:
An oil ring to be attached to a ring groove of a piston for an engine is provided. The oil ring includes two annular ring bodies having a common axis and arranged in tandem, and an expander for biasing the ring bodies radially outward. A sliding surface is formed at an outer circumference of each ring body to bulge radially outward and slides on a cylinder inner circumferential surface. The sliding surface of one of the ring bodies has a tip portion and first and second curved surfaces. In cross sections of the first and second curved surfaces, the first and second curved surfaces are connected while tangent lines to the cross sections at the tip portion align with each other, and when positional change rates are compared between points on the first and second curved surfaces, a change rate of the first curved surface is lower.
Inventors:
Fukuma Mao
Hiroaki Muranaka
Hideki Aoki
Shuji Takuma
Hiroaki Muranaka
Hideki Aoki
Shuji Takuma
Application Number:
JP2014186424A
Publication Date:
November 01, 2017
Filing Date:
September 12, 2014
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F16J9/06; F02F5/00; F16J9/20
Domestic Patent References:
| JP2014040914A |
Foreign References:
| WO2004040174A1 |
Attorney, Agent or Firm:
Maeda patent office
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