Double-piston master cylinder with central booster-driven piston

Details Double-piston master cylinder with central booster-driven piston Double-piston master cylinder with central booster-driven piston

1985-10-11

1987-11-03

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Pulsator

60584, 60589, 60591, 60593, B60T 1108, F15B 704

Patent

active

047036230

ABSTRACT:
A dual-piston hydraulic brake master cylinder includes a large hydraulic piston which supplies an initial large brake fluid volume and a small hydraulic piston which continues to supply brake fluid to the brakes when the large piston stops moving forward in its cylinder at higher brake pressures. The small, central hydraulic piston is connected to the end of a piston rod extension of a pneumatic booster piston. The large piston surrounds the small piston and opens a reservoir line tilt-valve in the piston retracted position. A passageway between the large and small hydraulic chambers is open in the retracted position to allow communication of braking fluid therebetween. During brake actuation a seal arrangement interrupts this communication. The large and small hydraulic chambers supply the brake circuits through delivery passages.

REFERENCES:
patent: 2206629 (1940-07-01), Bowen
patent: 2291056 (1942-07-01), Pallady
patent: 2373506 (1945-04-01), Schnell
patent: 3062011 (1962-11-01), Brooks
patent: 3981148 (1976-09-01), McLuckie
patent: 4099380 (1978-07-01), Cadeddu
patent: 4319457 (1982-03-01), Gross et al.
patent: 4467605 (1984-08-01), Smith

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