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:
Aug. 30, 2005
Filed:
Feb. 26, 2004
Naganori Koshimizu, Yamanashi-ken, JP;
Tomonori Mouri, Yamanashi-ken, JP;
Yasuhiko Amari, Yamanashi-ken, JP;
Yoshinari Iwai, Yamanashi-ken, JP;
Naganori Koshimizu, Yamanashi-ken, JP;
Tomonori Mouri, Yamanashi-ken, JP;
Yasuhiko Amari, Yamanashi-ken, JP;
Yoshinari Iwai, Yamanashi-ken, JP;
Kabushiki Kaisha Hitachi Seisakusho, Tokyo, JP;
Abstract
A master cylinder comprises a cylinder body in a cylindrical form having one end closed and including a discharge passage and a supply passage for a brake fluid, the supply passage being communicated with a reservoir. A piston is slidably disposed in the cylinder body, so as to form a pressure chamber for supplying a fluid pressure to the discharge passage. A piston seal is provided in a circumferential groove formed in the cylinder body, which has an inner circumferential surface thereof in slidable contact with the piston and is capable of sealingly disconnecting the supply passage and the pressure chamber. The cylinder body includes a communication groove which opens into the circumferential groove and extends from the circumferential groove toward the closed end of the cylinder body to thereby connect the circumferential groove and the discharge passage. The communication groove is formed outwardly beyond a bottom surface of the circumferential groove relative to a radial direction of the cylinder body.