B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/70
B60T 15/00 (2006.01) B60T 8/26 (2006.01) B60T 17/22 (2006.01)
Patent
CA 1153405
ABSTRACT OF THE DISCLQSURE 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 cylindri- cal 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 dis- posed 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 cylin- drical 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 out- let opening, thus bypassing the proportioning valve.
360696
Gaiser Robert F.
Stone Samuel E.
Bendix Corporation (the)
Macrae & Co.
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