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:
Jan. 17, 2017
Filed:
Dec. 22, 2011
Kazushi Miyamoto, Tokyo, JP;
Hirofumi Higashi, Tokyo, JP;
Jun Hoshikawa, Tokyo, JP;
Akihiro Fujimoto, Tokyo, JP;
Noritsugu Ohsawa, Tokyo, JP;
Kiminari Kato, Tokyo, JP;
Seiji Matsuda, Tokyo, JP;
Kazushi Miyamoto, Tokyo, JP;
Hirofumi Higashi, Tokyo, JP;
Jun Hoshikawa, Tokyo, JP;
Akihiro Fujimoto, Tokyo, JP;
Noritsugu Ohsawa, Tokyo, JP;
Kiminari Kato, Tokyo, JP;
Seiji Matsuda, Tokyo, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention provides a piston in which the moving piston unit can be prevented from rotating with respect the base piston unit, while suppressing the increase of the sliding resistance the piston has with respect to the cylinder. The circumferential wall of the moving piston unit has a pair of skirt parts opposing each other across a piston boss and a pair of side-wall parts coupling the skirt parts and each having an outer circumferential surface concaved toward the central axis Xof the piston. The side-wall parts have a penetration part each, which penetrates the side-wall part and extends in the directions the moving piston unit reciprocates with respect to the base piston unit. The base piston unit has rotation preventing projections that project perpendicular to the central axis of the piston and are inserted into the penetration parts.