Steering valve assembly for steering and brake system

Details Steering valve assembly for steering and brake system Steering valve assembly for steering and brake system

1979-09-07

1981-03-03

Hershkovitz, Abraham

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91517, 91518, F15B 1116

Patent

active

042533821

ABSTRACT:
A vehicle hydraulic system is disclosed of the type including a steering control valve (29), a brake system (31), and an auxiliary load circuit (65). Fluid flow to these load circuits is controlled by a flow control valve assembly (11) including a priority spool valve (85) which controls the flow of fluid from the inlet port (13) to the priority fluid chamber (75). Fluid flows from the priority fluid chamber to the steering control valve and the brake load system, in parallel, and at equal levels of priority. A shuttle valve assembly (83) receives a steering load signal by means of a load signal line (44) and a brake load signal from the load signal chamber (111), and transmits the higher of the two load signals into the load signal chamber (93) which biases the priority spool valve toward a position to permit a greater flow of fluid into the priority fluid chamber. Therefore, the control valve assembly disclosed herein requires only a single pump to provide sufficient fluid to satisfy the simultaneous demand for fluid by both the steering system and brake system.

REFERENCES:
patent: Re25126 (1962-02-01), Charlson
patent: 3455210 (1969-07-01), Allen
patent: 3834163 (1974-09-01), Wilke
patent: 4034563 (1977-07-01), Orth
patent: 4061201 (1977-12-01), Dunn
patent: 4074528 (1978-02-01), Lourigan
patent: 4075840 (1978-02-01), Jesswein

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