Motors: expansible chamber type – With alternative manual actuation of load – Alternate pedal positions
Patent
1980-07-14
1982-12-07
Walton, George L.
Motors: expansible chamber type
With alternative manual actuation of load
Alternate pedal positions
91434, 60547A, 60547B, F15B 042, F15B 1314
Patent
active
043620868
ABSTRACT:
The present invention relates to an improvement in a hydraulic brake booster, and in particular, covers a structure which provides a pressure limiter for the hydraulic brake booster. The booster comprises a housing which defines a pressure chamber and supports a control valve and a piston. During braking the control valve cooperates with an actuator to move relative to the housing so as to communicate pressurized fluid to the pressure chamber and the piston is movable in response to the pressurized fluid within the pressure chamber to effectuate braking. In order to limit the level of pressure of pressurized fluid communicated to the pressure chamber a ring is disposed within the housing in cooperation with the control valve. The ring cooperates with the control valve to define a differential area which is exposed to pressurized fluid to generate a force opposing movement of the control valve so that communication of pressurized fluid to the pressure chamber is limited. In a preferred embodiment the ring is integrally formed with a sleeve to form a differential area responsive to the pressurized fluid communicated to the pressure chamber and the sleeve cooperates with a resilient member to bias the control valve to a non-braking position.
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Decker Ken C.
Schoenle Paul David
The Bendix Corporation
Walton George L.
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