Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1997-07-21
1998-07-28
Lopez, F. Daniel
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
181207, 921691, F15B 910
Patent
active
057849463
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.
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Brochure entitled "Foam Materials" by Stephenson & Lawyer Inc.
Mardi C. Hastings "Damping and Stiffness characteristics of Sticky Steel" May 21, 1996 disclosed by Owens--Corning Fiberglass Granville, Ohio.
Malosh James B.
Viebach Rolf
Yoder Dave C.
Comstock Warren
Lopez F. Daniel
McCormick, Jr. Lee H.
Robert Bosch Technologies Corporation
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