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. 04, 2001
Filed:
Jul. 07, 1999
Masahiro Ikeda, Saitama-Ken, JP;
Bosch Braking Systems Co., Ltd., Tokyo, JP;
Abstract
A valve mechanism comprises a first valve seat formed on a valve body and facing rearward, a second valve seat formed on a sleeve which is urged rearward of a spring and facing rearward, and a valve element urged by a popped return spring to be seated upon either valve seat. An effective diameter D,of a rolling part of the valve element, an effective diameter D,of a seal member and an effective diameter D,of the second valve seat are chosen to be equal to each other. This arrangement allows a differential pressure which urges the sleeve and the valve element forward in the inoperative condition of the brake booster to be cancelled out, thereby allowing a load to which an urging spring must be charged to be reduced and thus allowing the use of a solenoid which is reduced in size, weight and heating value and hence which is inexpensive.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile