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:
May. 13, 2008
Filed:
Jun. 07, 2006
Kaoru Tsubouchi, Toyota, JP;
Yoji Inoue, Toyoake, JP;
Kaoru Tsubouchi, Toyota, JP;
Yoji Inoue, Toyoake, JP;
Advics Co., Ltd., Kariya, Aichi-pref., JP;
Abstract
In a negative pressure type booster device, secondary passagescommunicating directly with the atmosphere is formed between the internal surface of a sliding cylindrical portionof a valve pistonand the external surface of a silencer, and communication meansis provided for being controlled to vary its path area in dependence on the advance amount of an input rodwhen the same is moved beyond a predetermined distance relative to the valve piston. Thus, when a brake pedalis stepped on strongly, the atmospheric air can be led from the secondary passagesthrough the communication meansto a variable pressure chamber, so that the property of the responsiveness in braking operation can be improved to a responsiveness enhancing property which varies in dependence on the manner of stepping the brake pedal