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:
Feb. 06, 2001
Filed:
Jan. 07, 1999
Hiroyuki Oka, Higashimatsuyama, JP;
Hidefumi Inoue, Higashimatsuyama, JP;
Yoshiyasu Takasaki, Higashimatsuyama, JP;
Masahiro Shimada, Higashimatsuyama, JP;
Mamoru Sawada, Kariya, JP;
Yuzo Imoto, Kariya, JP;
Bosch Braking Systems Co., Ltd., Tokyo, JP;
Abstract
In a brake boosting system the present invention, as it is decided that brake assist is necessary, a pump,is driven, and a solenoid valve,is switched to its communication position, and a solenoid shut-off valve,is opened. Then, the pump,sucks brake fluid from a reservoir,through the solenoid valve,and sends out the brake fluid to the pressure intensifying chamber,through the solenoid shut-off valve,At this point, an output shaft,has already advanced and a radial hole,is positioned ahead of a seventh cup sealing member,so that the pressure intensifying chamber,and the reaction chamber,are shut off from the reservoir,so as to be in the sealed state. Therefore, pump discharge pressure is supplied to the pressure intensifying chamber,and the reaction chamber,so that the pressure in these chambers is intensified. Since the intensified pressure acts on the primary piston,the master cylinder pressure is intensified to a value greater than that of normal braking. As mentioned above, by intensifying the master cylinder pressure when necessary, large braking force can be obtained with a simple structure.