The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2007
Filed:
Feb. 24, 2006
Tatsuya Suzuki, Kanagawa, JP;
Shinji Masubuchi, Kanagawa, JP;
Toru Okuda, Yokohama, JP;
Kazunari Komatsu, Yokohama, JP;
Shingo Miyake, Yokohama, JP;
Tatsuya Suzuki, Kanagawa, JP;
Shinji Masubuchi, Kanagawa, JP;
Toru Okuda, Yokohama, JP;
Kazunari Komatsu, Yokohama, JP;
Shingo Miyake, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
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.