COMBINED PISTON RING

Title:

COMBINED PISTON RING

Document Type and Number:

WIPO Patent Application WO/2012/105538

Kind Code:

A1

Abstract:

Provided is a combined piston ring having an excellent gas seal characteristic and comprising a special gap effective for countermeasures against blow-by, wherein a combustion chamber-side side surface is not locally deformed nor melted even when receiving combustion gas from the combustion chamber side. To this end, a combined piston ring comprises a piston ring body which is produced from a high-strength heat-resistant resin and has a gap part having a step shape when viewed from the upper and lower surfaces and the outer peripheral surface, and a spring which is mounted to the inner peripheral part of the piston ring body and presses the piston ring body radially outward, and the combustion chamber-side side surface of at least the piston ring body is coated with a heat-resistant film.

Inventors:

OKAZAKI FUMIHIRO (JP)
SHIBANO TOMOYA (JP)
SUGIHARA HIROYUKI (JP)
KOBAYASHI HIROYUKI (JP)

Application Number:

PCT/JP2012/052098

Publication Date:

August 09, 2012

Filing Date:

January 31, 2012

Export Citation:

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Assignee:

RIKEN KK (JP)
OKAZAKI FUMIHIRO (JP)
SHIBANO TOMOYA (JP)
SUGIHARA HIROYUKI (JP)
KOBAYASHI HIROYUKI (JP)

International Classes:

F16J9/26; F02F5/00; F16J9/06; F16J9/14

Domestic Patent References:

WO2007099968A1

2007-09-07

Foreign References:

JP2004353577A	2004-12-16
JPH0441153U	1992-04-08
JPH0882370A	1996-03-26
JP2008155125A	2008-07-10
JP2007192242A	2007-08-02
JPH1068464A	1998-03-10
JPS59126158U	1984-08-24
JPH0441153U	1992-04-08
JP2003001584A	2003-01-08

Other References: