Brake booster device providing pressure to both pressure chamber

Details Brake booster device providing pressure to both pressure chamber Brake booster device providing pressure to both pressure chamber

1986-12-29

1989-01-31

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

60563, F15B 700

Patent

active

048007242

ABSTRACT:
This brake booster is for a vehicle whose tandem type brake master cylinder has a first piston and a second piston operating in tandem, with first and second pressure chamber and a reservoir chamber for the second brake fluid supply pressure chamber being defined in it. The brake booster has a power piston, one side of which is presented to an actuating pressure chamber, and which is driven by supply of pressurized brake fluid to that actuating pressure chamber so as to push the first piston of the master cylinder so as to expel fluid from the first and second pressure chambers towards the vehicle brakes. Brake fluid is supplied by a valve to the booster actuating pressure chamber upon brake pedal depression. A conduit is provided for directly conducting fluid from the actuating pressure chamber of the brake booster to the reservoir chamber for the second pressure chamber of the master cylinder. Optionally, intermediate along this conduit, a valve may be provided for interrupting fluid flow when the level of brake fluid stored in a booster storage reservoir drops below a determinate level, or when also the pressure of fluid in an accumulator for the booster actuating pressure chamber drops below a determinate level.

REFERENCES:
patent: 4417768 (1983-11-01), Satoh
patent: 4592599 (1986-06-01), Belart
patent: 4641894 (1987-02-01), Belart
patent: 4682824 (1987-07-01), Burgdorf

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