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:
Oct. 21, 2003
Filed:
Nov. 15, 2001
Hiroyuki Yamaga, Saitama-Ken, JP;
Hidefumi Inoue, Saitama-Ken, JP;
Bosch Braking Systems Co., Ltd., Tokyo, JP;
Abstract
An automatic brake booster includes a solenoid which causes a back- and forth movement of a solenoid plunger to switch a valve mechanism A second vacuum valve seat member including a second vacuum valve seat which is juxtaposed with a first vacuum valve seat on a valve body and a pressure responsive area subject to a pressure of a variable pressure chamber and a pressure of a constant pressure chamber is slidably mounted on the valve body. The effect of the pressure differential acting upon the pressure responsive area is balanced with the force resulting from the excitation of the solenoid plunger to deliver a brake output which corresponds to the force. The invention enables a high accuracy control of a brake output during an automatic brake operation.