Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1982-05-14
1984-10-23
Reger, Duane A.
Brakes
Wheel
Axially movable brake element or housing therefor
91 28, 188151A, 303 84A, F16D 5518, B60T 1110, B60T 1546, F15B 13042
Patent
active
044783183
ABSTRACT:
An improved brake control apparatus for a brake system having redundant brake application fluid circuits 30, 32 and a brake retraction fluid circuit 62. A valve assembly 34, including a slidable two position valve element 60 communicates one brake application fluid circuit 30 with the retraction circuit 62, during normal brake actuation. The valve element 60 is biased towards one position by the combination of pressure in the other brake application circuit 32 and a resilient biasing arrangement 68, and biased towards the second position by pressure in the one application circuit 30. In the event of failure in the other application 32 circuit, the loss of biasing fluid pressure causes the valve element to shift to the second position, interrupting fluid communication from the one application circuit to the retraction circuit and drains fluid pressure in the retraction circuit into the failed circuit. The valve assembly also includes a check valve 62a and flow restriction 62b which cooperate with an accumulator 86 to delay the depressurization of the retraction circuit whenever the brakes are deenergized in order to obtain piston retraction.
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Euclid, Inc.
Oberleitner Robert J.
Reger Duane A.
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