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. 27, 2009
Filed:
Mar. 27, 2006
Kazuhiro Tagata, Nagano, JP;
Koji Sakai, Nagano, JP;
Takaomi Shirase, Nagano, JP;
Yasushi Aoki, Saitama, JP;
Kenji Suzuki, Saitama, JP;
Hiroshi Nakano, Saitama, JP;
Kazuhiro Tagata, Nagano, JP;
Koji Sakai, Nagano, JP;
Takaomi Shirase, Nagano, JP;
Yasushi Aoki, Saitama, JP;
Kenji Suzuki, Saitama, JP;
Hiroshi Nakano, Saitama, JP;
Nissin Kogyo Co., Ltd., Nagano, JP;
Abstract
A fluid pressure booster includes: a control piston in which brake operation input acts in an advancing direction, and reaction based on fluid pressure of a booster fluid pressure generation chamber that generates fluid pressure for actuating a master piston acts in a retracting direction; a pressure increasing valve provided between the booster fluid pressure generation chamber and a fluid pressure generation source so as to open at the time of advance of the control piston and close at the time of retraction of the control piston; and a pressure reducing valve provided between a release chamber and the booster fluid pressure generation chamber so as to close at the time of the advance of the control piston and open at the time of the retraction of the control piston. The pressure increasing valve includes first valve means and second valve means that sequentially open according to an increase in the brake operation input, and a seal diameter of the second valve means is larger than that of the first valve means. Thus, it is possible to enhance initial response of the pressure increasing valve, and also enhance response of the pressure increasing valve when a brake operation member is strongly operated.