Vehicle power brake system with master booster and slave booster

Details Vehicle power brake system with master booster and slave booster Vehicle power brake system with master booster and slave booster

1976-12-10

1978-06-27

Halvosa, George E. A.

Power plants

Pressure fluid source and motor

Pulsator

60558, 60581, 188357, 303 6R, B60T 1300

Patent

active

040966968

ABSTRACT:
The vacuum chamber of the master booster is connected to a slave booster having a chamber also normally below atmospheric pressure. The variable pressure chamber of the master booster is connected to the other chamber of the slave booster through a check valve. The master booster operates a dual master cylinder with one pressurizing chamber connected to the rear brakes and the other pressurizing chamber connected to the master cylinder associated with the slave booster and then to the front brakes. In the first stage of actuation the master booster operates its master cylinder to pressurize the front and rear brakes equally. When a preselected boost level is reached, the pressure increase in the master booster variable pressure chamber will open the check valve and the pressure increase will be delivered to the slave booster. As the slave booster power wall moves, a valve in its master cylinder (which had been permitting front brake pressure to pass through) closes and the slave booster acts together with the pressure delivered to it from the dual master cylinder to increase the pressure delivered to the front brakes at a faster rate of pressure build-up than that delivered to the rear brakes.

REFERENCES:
patent: 2526236 (1950-10-01), Ingres
patent: 2929363 (1960-03-01), Stelzer
patent: 3416314 (1968-12-01), Cripe
patent: 3799303 (1974-03-01), Stoltman

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