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:
Dec. 17, 2019
Filed:
Nov. 04, 2015
Hitachi Automotive Systems, Ltd., Ibaraki, JP;
Hiroshi Shigeta, Kai, JP;
Daichi Nomura, Kawasaki, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Ibaraki, JP;
Abstract
An electric motor () is controlled according to the stroke of an input rod () moved in response to an operation of a brake pedal. The rotation of the electric motor is transmitted through a belt transmission mechanism () to a ball-screw mechanism () to propel a primary piston (), thereby generating a brake hydraulic pressure in a master cylinder (). The belt transmission mechanism has pulleys (A,B), one of which is secured to an output shaft of the electric motor. The output shaft and a nut member () of the ball-screw mechanism are held by bearings (A,B andC) secured to a rear housing (B) which is a single member. Thus, before an electric motor-driven booster () is assembled, the belt transmission mechanism can be subassembled to the rear housing. Therefore, a belt () can be adjusted for tension in the state of a subassembly.