Power plants – Pressure fluid source and motor – Pulsator
Patent
1982-03-31
1984-06-26
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Pulsator
60578, 60585, 60589, 60562, B60T 1108, F15B 704
Patent
active
044558317
ABSTRACT:
A differential master cylinder adapted for use as fluid pressure generating source in a brake system comprises a cylinder body having a stepped cylinder formed therein; a stepped piston arranged to be slidable within the stepped cylinder; a first chamber defined by the end of a portion of smaller diameter of the stepped piston and a portion of smaller diameter of the stepped cylinder; a second chamber defined by the stepped piston and a portion of larger diameter of the stepped cylinder; a first fluid passage provided at the stepped piston and arranged to have the first and second chambers intercommunicate; a check valve arranged in the first fluid passage to close when fluid pressure within the second chamber reaches a first setting value; and a relief valve arranged to open to return the fluid from the second chamber to a reservoir when the fluid pressure within the second chamber reaches a second setting value which is higher than the first value. The relief valve is disposed in a second fluid passage formed within the cylinder body to render the second chamber communicative with the reservoir. The master cylinder arrangement gives a sufficient force multiplying effect despite of simple construction thereof and ensures stable operation even for sudden brake application.
REFERENCES:
patent: 1958722 (1934-05-01), Sinclair et al.
patent: 2508403 (1950-05-01), Knauss
patent: 2631433 (1953-03-01), Thomas
patent: 2661598 (1953-12-01), Thomas
patent: 2976686 (1961-03-01), Stelzer
patent: 4078385 (1978-03-01), Zabadneh
patent: 4140351 (1979-02-01), Nogami
Akebono Brake Industry Co. Ltd.
Garrett Robert E.
Moritz Scott L.
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