Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1979-03-01
1980-12-02
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188349, 303 24A, 303 24C, 303 24F, B60T 802
Patent
active
042367603
ABSTRACT:
A brake-force regulator for dual-circuit brake systems including first and second stepped pistons disposed in a multiple-step housing bore such that the end of the smaller diameter portion of both the first and second piston abut one another. An inlet chamber coupled to the master cylinder is provided adjacent the annular surface between the larger diameter portion and the smaller diameter portion of each of the first and second pistons. A first output chamber coupled to one of the brake circuits is provided adjacent the end of the larger diameter portion of the first piston and a second output chamber coupled to the other brake circuit is provided adjacent the end of the larger diameter portion of the second piston. A first valve is associated with the first piston to couple the associated one of the inlet chambers to the first outlet chamber and a second valve is associated with the second piston to couple the associated one of the inlet chambers to the second outlet chamber. A spring is provided to urge the first piston against the second piston and a stop is provided for the second piston such that when the second piston is against the stop the second valve is kept open. Two different embodiments are disclosed in which the first valve is a deceleration-responsive valve and the second valve is a pressure-responsive valve and a third embodiment is disclosed in which both the first and second valves are pressure-responsive valves.
REFERENCES:
patent: 3738709 (1973-06-01), Stokes
patent: 3969000 (1976-07-01), Ohta et al.
patent: 4071281 (1978-01-01), Tomoyuki
Haar Lucas H.
Schafer Ernst-Dieter
Butler Douglas C.
Hill Alfred C.
IT&T Industries, Inc.
O'Halloran John T.
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