Servo-assisted master cylinder assemblies

Details Servo-assisted master cylinder assemblies Servo-assisted master cylinder assemblies

1987-07-21

1988-03-22

Hershkovitz, Abraham

Power plants

Pressure fluid source and motor

Pulsator

60556, 60562, B60T 1320

Patent

active

047320028

ABSTRACT:
A servo-assisted master cylinder assembly for a vehicle hydraulic braking system has a tandem master cylinder with primary and secondary pistons operative to pressurise primary and secondary pressure spaces for primary and secondary brake circuits. A servo chamber is defined behind the primary piston, and pressurisation of the servo chamber from a source of pressure fluid is controlled by a valve in response to an input force applied to the primary piston. The valve comprises a spool operated solely by pressure in the primary space and a bias force from servo pressure in a bias chamber and a spring. The secondary piston has a smaller effective area than the primary piston, so that the pistons are in abutment in their retracted positions. To reduce pedal travel, one of the brakes of the primary circuit can be supplied from the servo chamber instead of the primary pressure space.

REFERENCES:
patent: 3257811 (1966-06-01), Aiki
patent: 3332322 (1967-07-01), Beck
patent: 4123908 (1978-11-01), Bertone
patent: 4324101 (1982-04-01), Farr
patent: 4404803 (1983-09-01), Steffes
patent: 4419862 (1983-12-01), Farr
patent: 4449369 (1984-05-01), Dauvergne
patent: 4463562 (1984-08-01), Taft
patent: 4483144 (1984-11-01), Steffes
patent: 4524584 (1985-06-01), Kobayashi
patent: 4534171 (1985-08-01), Leiber
patent: 4625516 (1986-12-01), Gaiser

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