PISTON RING - KK RIKEN

Title:

PISTON RING

Document Type and Number:

WIPO Patent Application WO/2017/146048

Kind Code:

A1

Abstract:

Provided is a piston ring which can sufficiently exhibit the sealability of the outer circumferential surface thereof and in which increase in oil consumption due to reduction of surface pressure and increase in frictional loss due to progress of wear can be reduced. A piston ring 1 is provided with an annular body 2 that includes: an inner circumferential surface 2c and an outer circumferential surface 2d; side surfaces 2a, 2b substantially orthogonal to the inner circumferential surface 2c; and a pair of joint ends 4, 5 which are opposed to each other to form a joint section 3. The outer circumferential surface 2d includes an inclined surface 11 and an abutment surface 12 that is provided on the side surface 2b side of the inclined surface 11 and that extends in substantially parallel to the inner circumferential surface 2c. The maximum width W1, of the abutment surface 12, at the joint ends 4, 5 is 80-150% of the maximum width W2, of the abutment surface 12, at a main portion 6. In the body 2, the axial difference (d2-d1) between a diameter d1 passing through the central position of the joint section 3 in a first axis direction and a diameter d2 in a second axis direction orthogonal to the first axis direction is greater than -0.25 mm but less than +0.36 mm.

Inventors:

FUJITA MASAAKI (JP)

Application Number:

PCT/JP2017/006379

Publication Date:

August 31, 2017

Filing Date:

February 21, 2017

Export Citation:

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Assignee:

KK RIKEN (JP)

International Classes:

F02F5/00; F16J9/20; F16J9/26

Domestic Patent References:

WO2012118036A1

2012-09-07

Foreign References:

US6470792B1	2002-10-29
JPS6218775Y2	1987-05-14
JPS636270U	1988-01-16
JP2011169388A	2011-09-01
JPS5615437U	1981-02-10
JP2002054499A	2002-02-20
JPH01224569A	1989-09-07
JP2011169388A	2011-09-01
JPS5615437U	1981-02-10

Other References: