Title:
PISTON RING
Document Type and Number:
WIPO Patent Application WO/2020/251058
Kind Code:
A1
Abstract:
According to the present invention, the outer circumferential surface (1) of a side rail (11) is provided with: a pair of lateral adjacent parts (3, 4); an outermost diameter part (6); and at least one recessed part (7, 8). The contour line (6) of the outermost diameter part is a curve having a center (O6) of curvature, the center (O6) of curvature is disposed on a radial inside of common tangential lines (L1, L2) of contour lines (L3, L4) of the lateral adjacent parts (3, 4) and a contour line (L6) of the outermost diameter part 6, contour lines (L7, L8) of recessed parts (7, 8) are curves having centers (O7, O8) of curvature, and the centers (O7, O8) of curvature are disposed on a radial outside of the common tangential lines (L1, L2).
Inventors:
SHIMIZU HIROSHI (JP)
Application Number:
PCT/JP2020/023476
Publication Date:
December 17, 2020
Filing Date:
June 15, 2020
Export Citation:
Assignee:
KK RIKEN (JP)
International Classes:
F02F5/00; F16J9/20; F16J9/26
Domestic Patent References:
| WO2016143315A1 | 2016-09-15 |
Foreign References:
| JP2006153198A | 2006-06-15 | |||
| US20150130143A1 | 2015-05-14 | |||
| JP2010530045A | 2010-09-02 | |||
| JPH0411195U | 1992-01-30 | |||
| JP2015503072A | 2015-01-29 | |||
| JP2016138629A | 2016-08-04 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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