Spool valve for hydraulic brake booster

Details Spool valve for hydraulic brake booster Spool valve for hydraulic brake booster

1974-04-01

1976-03-23

Maslousky, Paul E.

Motors: expansible chamber type

With motive fluid valve

Self-opening exhaust valve held closed by inlet pressure

91391R, 91451, F15B 1310, F15B 1108, F15B 1304

Patent

active

039453014

ABSTRACT:
A hydraulic brake booster is disclosed for use in a vehicle hydraulic braking system. The booster provides a spool valve having spaced lands and grooves cooperating with corresponding lands and grooves on the booster housing to control communication between an inlet port, an outlet port, an exhaust port, and the booster pressure chamber. The spool valve has an internal passage which communicates the booster pressure chamber to one of the aforementioned ports depending upon the position of the spool valve. A check valve is provided in a branch passage communicating with the groove communicated with the booster inlet port so that the pressure level in the pressure chamber never exceeds the pressure level at the inlet regardless of the position of the spool valve. This feature enhances spool stability.

REFERENCES:
patent: 1029247 (1912-06-01), Wilcox
patent: 3006323 (1961-10-01), Tilney
patent: 3158068 (1964-11-01), Bokelman
patent: 3724332 (1973-04-01), Bach
patent: 3751912 (1973-08-01), Bach
patent: 3768371 (1973-10-01), Orme

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