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:
Sep. 15, 1992
Filed:
Jan. 17, 1991
Tateo Kume, Kameoka, JP;
Kazuhiro Shiraishi, Kameoka, JP;
Masahiko Matsuda, Kyoto, JP;
Toru Okada, Kameoka, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A variable compression ratio apparatus is provided for use in an internal combustion engine. The apparatus has an eccentric sleeve rotatably arranged in one of pivot portions at opposite ends of a connecting rod so as to make a bearing hole of the connecting rod and a pin, which extends through the bearing hole, eccentric relative to each other. The apparatus also has an eccentric sleeve lock device capable of fixing rotation of the eccentric sleeve at a desired position. The lock device includes a pin member engageable with one of engagement portions formed in the eccentric sleeve and a piston-type fluid pressure drive system. The drive system is adapted to produce a pressure difference between fluid pressure chambers formed at opposite sides of a piston portion, which is connected to the pin member, in a state that the fluid pressure chambers are applied with a prescribed fluid pressure, whereby the piston portion is moved to drive the pin member.