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. 20, 1994
Filed:
May. 28, 1993
Shintaro Uyama, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
A valve mechanism for a brake or clutch booster, and more particularly, an improvement of a valve element used therein is disclosed. The valve element includes a seat which is located at the front end, a connection located at the rear end and connected to the inner periphery of a valve body, and a curved portion which is axially collapsible and interconnecting between the seat and the connection. An annular groove is formed in the inner peripheral surface of the connection at its front end. With this arrangement, the provision of the annular groove is effective to prevent any reduction in the flexibility of the curved portion if the diameter of the seat of the valve element is increased in order to increase the flow rate of the atmosphere into the booster. Thus, if the diameter of the seat 10a of the valve element 10 is increased, there is no need to increase the diameter of the connection 10b of the valve element 10. This permits the pressure responsive area of the curved portion which is subject to a pressure differential when the booster is inoperative to be reduced. Accordingly, any resulting increase in the set loading upon a coiled spring which is used to return an input shaft to its inoperative position can be minimized. In this manner, the response of the booster can be improved without impairing a brake feeling experienced by a driver.