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:
Jul. 13, 2010
Filed:
Nov. 28, 2006
Yukio Ohtani, Kawasaki, JP;
Yasuo Karasudani, Kai, JP;
Takuya Obata, Minami-Alps, JP;
Hitachi, Ltd, Tokyo, JP;
Abstract
A disk brake with a parking brake mechanism capable of exerting a large piston thrust required for operating a parking brake, without adversely affecting operation of a service brake. A parking brake mechanism, which is driven by an electric motor provided outside a housing, is incorporated in a caliperin which a pistonis slidably disposed in a cylinder. The parking brake mechanismis slidably fitted via a seal memberinto the pistonand provided with a nut memberthat is prevented from rotating relative to the pistonby engagement of a pinand a pin hole; and a shaftthat is screwed into the nut member. During a service brake operation, the pistonalone is moved by a hydraulic pressure under a small piston thrust. During a parking brake operation, the pistonand the nut memberare moved together by applying a hydraulic pressure and operating the electric motor at the same time, to exert a large piston thrust, by using a large pressure receiving area of the pistonand the nut membercombined.