Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1992-05-22
1993-11-09
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, 92 98R, 92 99, F15B 910, F01B 1900
Patent
active
052592928
ABSTRACT:
A vacuum booster has a booster shell formed of a front shell half and a rear shell half interconnected at their open ends opposed to each other, and a diaphragm which divides the shell interior into a vacuum chamber on the front shell half side and a working chamber on the rear shell half side. An outer peripheral bead portion of the diaphragm is clamped between the open ends of both the shell halves with an outer surface of the outer peripheral bead portion being contacted under pressure with an inner surface of the open end of the front shell half. The outer peripheral bead portion is provided at an outer periphery thereof with a first tapered surface tapered toward the front shell half and a second tapered surface tapered toward the rear shell half such that the first and second tapered surfaces are formed into an angled shape in their cross section. Thus, the frictional resistance upon the insertion of the diaphragm during assembling of the vacuum booster can be made relatively small, thereby improving an assembling and insuring a sufficient sealing by the outer peripheral bead portion.
REFERENCES:
patent: 2448981 (1948-09-01), Ingres
patent: 3132567 (1964-05-01), Ingres
patent: 4072365 (1978-07-01), Pauwels
patent: 4296680 (1981-10-01), Ohta et al.
patent: 4522108 (1985-06-01), Takeuchi et al.
patent: 4821623 (1989-04-01), Shinohara
patent: 4936635 (1990-06-01), Sakaguchi
patent: 5025709 (1991-06-01), Miyazaki
Sunohara Hidemitsu
Suwa Toshiyuki
Look Edward K.
Nguyen Hoang
Nissin Kogyo Co. Ltd.
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