Back-to-back proportioning valve

Details Back-to-back proportioning valve Back-to-back proportioning valve

1979-10-01

1981-08-04

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

188349, 303 84A, B60T 826

Patent

active

042818800

ABSTRACT:
A back-to-back proportioning valve assembly for a cross-split braking system is disclosed. The proportioning valve assembly comprises an assembly housing defining a substantially cylindrical bore extending therethrough. The bore defines first and second rear brake outlet openings. In the assembly housing are disposed a pair of inlet passages extending within the cylindrical bore connected with respective first and second master cylinder chambers. A pair of front brake outlet openings are also disposed in the assembly housing. First and second proportioning valves are positioned in back-to-back relationship within the cylindrical bore adjacent respective first and second rear brake outlet openings for proportioning the inlet pressure to the rear brake outlets. A pair of bypass channels, for bypassing each of the proportioning valves, are provided to be opened upon failure of one of the braking systems. A differential pressure piston, in the form of a cylindrical spool, is disposed within the cylindrical bore to overlie the bypass channel ports. Upon failure of one of the braking systems, the differential piston shifts, thus opening one of the bypass ports and providing a direct fluid communication path from the inlet passage to the rear brake outlet opening, thus bypassing the proportioning valve.

REFERENCES:
patent: 3450443 (1969-06-01), Bueler
patent: 3917355 (1975-11-01), Takeuchi
patent: 3970347 (1976-07-01), Mizusawa
patent: 3975060 (1976-08-01), Hirayama

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