Title:
PISTON RING COMBINATION
Document Type and Number:
WIPO Patent Application WO/2020/100564
Kind Code:
A1
Abstract:
In this piston ring combination, a second outer peripheral surface, which is the outer peripheral surface of a second ring, has a second protruding surface curved into a convex shape outward in the diametrical direction of the second ring, the peak of the convex shape being positioned farthest outward in the second outer peripheral surface along the diametrical direction of the second ring, and a pair of third outer peripheral surfaces, which are the outer peripheral surfaces of a pair of segments, each have a third outer peripheral area in which a third protruding surface is formed, the third protruding surfaces being curved into convex shapes outward in the diametrical direction of an oil ring and the peaks of the convex shapes being positioned farthest outward in the third outer peripheral surfaces along the diametrical direction of the oil ring. In at least one of the pair of third outer peripheral surfaces, the peripheral edge on a crank-chamber side is positioned farther outward in the diametrical direction than the peripheral edge on a combustion-chamber side, and the peak of the third protruding surface is positioned nearer to the crank chamber than the center of the third outer peripheral surface along the axial direction of the oil ring.
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Inventors:
NANGO TETSUYA (JP)
Application Number:
PCT/JP2019/042141
Publication Date:
May 22, 2020
Filing Date:
October 28, 2019
Export Citation:
Assignee:
TPR CO LTD (JP)
International Classes:
F16J9/20; F02F5/00; F16J9/06
Foreign References:
| JP2018009705A | 2018-01-18 | |||
| JP2009091927A | 2009-04-30 | |||
| JP2010530045A | 2010-09-02 | |||
| JP2001241357A | 2001-09-07 | |||
| JP2012215238A | 2012-11-08 |
Other References:
See also references of EP 3825584A4
Attorney, Agent or Firm:
IP FIRM SHUWA (JP)
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