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:
Jul. 28, 1998
Filed:
Jul. 21, 1997
James B Malosh, Boroda, MI (US);
Rolf Viebach, South Bend, IN (US);
Dave C Yoder, South Bend, IN (US);
Robert Bosch Technologies Corporation, Broadview, IL (US);
Abstract
A vacuum brake booster having sound absorbing members affixed to the front and rear shells to attenuate sounds caused by air movement in the brake booster. The front shell is joined to the rear shell to define the housing for the brake booster. The housing is divided into a first chamber and a second chamber by a wall structure. The first and second chambers in a first mode of operation are designed to be in communication with a first source of fluid (vacuum) having a first fluid pressure while in a second mode of operation the second chamber is in communication with a second source of fluid (atmospheric air) at a second fluid pressure. In the second mode of operation, a pressure differential is created across the wall structure to produce an output force corresponding to an input force associated with a desired braking application. A first sound absorbing member is affixed to rear shell for attenuating sounds produced by the communication of the second source of fluid in the second mode of operation while a second sound absorbing member is affixed to the front shell for attenuating sounds produced by the evacuation of the second source of fluid from the second chamber to return to the first mode of operation.