Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1983-11-23
1985-01-22
Maslousky, Paul E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, 92 49, 92169, F15B 910, F01B 1900
Patent
active
044944454
ABSTRACT:
A tandem-type brake booster including a closed shell assembly composed of front and rear chambers defined by a partition member therein and power pistons coaxially disposed in the front and rear chambers, respectively, the power pistons being operatively coupled with each other and passing through a substantially central portion of the partition member, each of the front and rear chambers being divided into a constant-pressure chamber subjected to a vacuum and a variable-pressure chamber communicable selectively with the constant-pressure chamber and atmosphere, the constant-pressure chambers in the front and rear chambers being held in communication with each other, the variable-pressure chambers in the front and rear chambers being held in communication with each other, the power pistons being axially movable in unison by pressure differences between the constant-pressure chambers and the variable-pressure chambers, respectively, one of the front and rear chambers having an outside diameter smaller than that of the other chamber and that of the power piston disposed in the other chamber, and the power piston in the other chamber having an outer peripheral portion overlapping an outer peripheral portion of the one chamber when the power pistons are moved forward.
REFERENCES:
patent: 2989035 (1961-06-01), Stelzer
patent: 3388635 (1968-06-01), Hager
patent: 3420145 (1969-01-01), Stumpe
patent: 3958497 (1976-05-01), Gardner et al.
patent: 4069742 (1978-01-01), Gephart et al.
Furuta Yohichi
Nishii Michiharu
Tsubouchi Kaoru
Aisin Seiki Kabushiki Kaisha
Maslousky Paul E.
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