Springs for constant abutment push rod and master cylinder pisto

Details Springs for constant abutment push rod and master cylinder pisto Springs for constant abutment push rod and master cylinder pisto

1988-04-29

1989-03-28

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Pulsator

92 138, 92129, F16J 110, B60T 1346, B60T 1118

Patent

active

048152935

ABSTRACT:
A vacuum brake booster and hydraulic master cylinder arrangement with lost-motion-eliminating abutment between the vacuum booster push rod and the master cylinder piston. The vacuum booster has an input rod, a valve, a power piston, and an adjustable length output push rod. A first spring biases the power piston to the rest position but exerts a force less than the counter-force exerted by atmospheric pressure on the input side portion of the power piston extending from the booster housing. A second spring urges the cylinder piston into contact with the push rod. This second spring is stronger than the first spring so that when vacuum is applied in the rest position the action of the two springs exerts a net force sufficient to balance the force exerted on the power piston exterior by atmospheric pressure and also maintains the push rod in constant contact with the master cylinder piston to minimize the overall actuation lost stroke of the assembly.

REFERENCES:
patent: 2873724 (1959-02-01), Olnhausen
patent: 3100379 (1963-08-01), Price
patent: 4201057 (1980-05-01), Martin
patent: 4227371 (1980-10-01), Takeuchi
patent: 4270355 (1981-06-01), Green
patent: 4307570 (1981-12-01), Yardley
patent: 4453452 (1984-06-01), Meynier
patent: 4505114 (1985-03-01), Haar

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