Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shingo Miyake0
Shinji Masubuchi0
Kazunari Komatsu0
Tatsuya Suzuki0
Toru Okuda0
Date of Patent
November 6, 2007
0Patent Application Number
113608160
Date Filed
February 24, 2006
0Patent Primary Examiner
Patent abstract
A lip ring is attached to a piston so as to be rotatable relative to the piston in a circumferential direction, and a seal portion is provided between a ring attachment groove of the piston and an attachment portion of the lip ring. During a suction stroke, the lip ring can be rotated in a circumferential direction of the piston, thus distributing wear around the entire periphery of a lip portion of the lip ring. During a compression stroke, leakage of air from a compression chamber can be prevented by means of the seal portion provided between the ring attachment groove and the lip ring.
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