PISTON RING

WIPO Patent Application WO/2015/125832

A1

Provided is a piston ring with which abrasion resistance of the outer peripheral surface can be ensured, and the formation of cylinder scratches and scuffs can be inhibited. In this piston ring (1), a hard coating (11) is formed on the outer peripheral surface (2d) of a main body part (2), and abrasion resistance to a bore inner-peripheral surface (21a) is ensured. Furthermore, on the hard coating (11), a rough surface (12) having a greater surface roughness than other sections of the hard coating (11) is formed along the peripheral direction of the main body part (2), and is unevenly positioned towards a side surface (2b) side of the main body part (2). The rough surface (12) has an affinity with oil (23) which is higher than that of the other sections of the hard coating (11), and functions as an oil pocket (P). As a result, the oil (23) thickly accumulates in the oil pocket (P) when the piston rises, and, when the piston descends, the piston ring (1) scrapes down the bore inner-peripheral surface (21a) of a cylinder (21) while the oil (23) is in a thickly accumulated state, and thus the formation of scratches and scuffs on the bore inner-peripheral surface (21a) can be inhibited.

KATO NORIYASU (JP)
SATO DAISUKE (JP)

PCT/JP2015/054468

August 27, 2015

February 18, 2015

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RIKEN KK (JP)

F16J9/26; F02F5/00

WO2013084800A1	2013-06-13
WO2015045745A1	2015-04-02

JPS63164661U	1988-10-26
JP2010038295A	2010-02-18
JPH0466A	1992-01-06

HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)

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