Fluid pressure controller for antilock brake control device

Details Fluid pressure controller for antilock brake control device Fluid pressure controller for antilock brake control device

1989-08-03

1991-03-26

Reger, Duane A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 92, B60T 842

Patent

active

050023446

ABSTRACT:
A fluid pressure control device for antilock control includes a housing having inlet and outlet ports communicating with a master cylinder and a wheel brake, respectively, and a spool mounted in the housing so as to be slidable between two positions. When the spool is in one of the two positions, a large-flow channel is formed between the inlet and outlet ports, whereas in the other position, a small-flow channel is formed therebetween. When in an intermediate positon, both the large-flow and small-flow channels are closed. A bypass channel branches off from the small-flow channel so as to extend to the outlet port. A check valve is provided in this channel. Even if the spool should get stuck and immovable at an intermediate position between the above two positions, hydraulic oil can be fed from the inlet port to the outlet port through this bypass channel.

REFERENCES:
patent: 3851930 (1974-12-01), Grosseau
patent: 4715666 (1987-12-01), Farr

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