Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1982-07-26
1984-04-24
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188349, 303 24F, 303 24C, B60T 814, B60T 826
Patent
active
044444370
ABSTRACT:
Valve assemblies for single and dual circuit braking systems are described. An assembly for a single circuit (FIG. 1) has a primary piston provided with a normally open valve seat engageable by a deceleration sensing ball housed in the primary piston. An annular secondary piston is slidably mounted on the larger diameter end of the primary piston. Primary piston has an area (A.sub.2) exposed to outlet pressure in a chamber and a smaller area (A.sub.1) exposed to inlet pressure in a housing bore portion, and is capable of rearward movement against biassing of a spring. Rearward movement of secondary piston is restricted firstly by a flange on the primary piston and secondly by a step on the housing. With increasing inlet pressure the pistons move rearwardly against the force of the spring until the seat is closed by rolling of the ball, and thereafter for increasing inlet pressure a stepped output characteristic is generated, the step in the characteristic resulting from the force required to remove the secondary piston from the housing step against outlet pressure.
REFERENCES:
patent: 3398757 (1968-08-01), Milster
patent: 3489465 (1970-01-01), Bueler
patent: 4265493 (1981-05-01), Ryuichi
Butler Douglas C.
Lucas Industries Public Limited Company
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