Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1988-11-30
1989-12-12
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188349, 303 68, 60591, B60T 1300, B60T 826
Patent
active
048863190
ABSTRACT:
The present invention provides an apparatus and method of utilization thereof of a vehicle brake master cylinder proportioning valve. The valve includes a valve body having a main bore fluidly connected with the master cylinder, primary and secondary circuits. A first housing fluidly seals the main bore into first and second chambers. A second housing fluidly separates the main bore second chamber from the secondary circuit. A valve piston spring biased away from the first chamber is mounted within a bore of the housing. The valve also has fluid communication between the second circuit and second chamber when the fluid pressure within the second circuit exceeds the fluid pressure within the second chamber. At an increase in master cylinder pressure past a first predetermined pressure the valve piston moves towards the first chamber, reaching a pressure balanced position metering pressurized fluid flow from the master cylinder to the second circuit. A lowering of the master cylinder pressure causes the piston to move towards the first chamber displacing fluid away from the second circuit and thereupon the valve piston is returned by the spring to a position furtherest away from the first chamber.
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Nies David L.
Shroyer Tomas L.
Butler Douglas C.
General Motors Corporation
Helms Ernest E.
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