Title:
COMBINED OIL RING
Document Type and Number:
WIPO Patent Application WO/2019/008780
Kind Code:
A1
Abstract:
Provided is a combined oil ring with which friction occurring during oil ring sliding, as well as the amount of oil consumed during same, can be reduced. The shape of the outer circumferential surface of an upper segment (among a pair of segments) provided on the engine combustion chamber side is constituted by a pair of symmetrical curved shapes each extending from the end point of the outer circumferential end portions of the two faces defining the width of the upper segment toward the tip-end portion of the outer circumferential surface that slides on the cylinder inner wall, and the outer circumferential tip-end portion of the upper segment has an asymmetrical shape across the apex of the outer circumferential surface in the width direction of the upper segment. The shape of the outer circumferential surface of the lower segment provided on the side away from the engine combustion chamber is constituted by a pair of symmetrical curved shapes each extending from the end point of the outer circumferential end portions of the two faces defining the width of the lower segment toward the tip-end portion of the outer circumferential surface that slides on the cylinder inner wall, and the outer circumferential tip-end portion of the lower segment has a symmetrical shape across the apex of the outer circumferential surface in the width direction of the lower segment.
More Like This:
| JPH11230344 | PISTON RING STRUCTURAL BODY |
Inventors:
KAWANO KENTARO (JP)
TAMAKI SEIJI (JP)
TAMAKI SEIJI (JP)
Application Number:
PCT/JP2017/026699
Publication Date:
January 10, 2019
Filing Date:
July 24, 2017
Export Citation:
Assignee:
TPR CO LTD (JP)
International Classes:
F16J9/06; F16J9/20; F16J9/26
Domestic Patent References:
| WO2016038916A1 | 2016-03-17 |
Foreign References:
| JP2016056935A | 2016-04-21 | |||
| JP2016169791A | 2016-09-23 | |||
| JP4800946B2 | 2011-10-26 | |||
| JP4322500B2 | 2009-09-02 |
Other References:
See also references of EP 3453927A4
Attorney, Agent or Firm:
IAT WORLD PATENT LAW FIRM (JP)
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