Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1986-06-17
1988-07-19
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91376R, 92 84, F15B 910
Patent
active
047577487
ABSTRACT:
A vacuum booster including a push rod, a housing having a first and second compartments, a power piston located in the housing and operated by a pressure differential between the first and second compartments and including a small and large diameter opening portion, a control valve operatively associated with the push rod and located within the power piston for controlling the pressure differential between the first and second compartments in response to movement of the push rod, an output member having a rear end portion slidably disposed within the large diameter opening portion of the power piston, a valve plunger provided in the control valve and having one end slidably disposed in the small diameter opening of the power piston, a resilient reaction disc located adjacent the rear end portion of the output member and disposed within the large diameter portion of the power piston, and an elastic member disposed between the rear end portion of the output member and the power piston and defining a position of the output member for the power piston to form a predetermined gap in an axial direction between the resilient reaction disc and the output member when the vacuum booster is not operated.
REFERENCES:
patent: 3543298 (1970-11-01), Rockwell
patent: 4347779 (1982-09-01), Belart
patent: 4437390 (1984-03-01), Ohta
patent: 4494443 (1985-01-01), Tsubouchi
Kawasumi Satoshi
Nishii Michiharu
Aisin Seiki Kabushiki Kaisha
Garrett Robert E.
Williamson Mark A.
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