Hydraulic pressure control valve

Details Hydraulic pressure control valve Hydraulic pressure control valve

1981-10-29

1984-04-24

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

188349, 303 24F, B60T 814, B60T 1134

Patent

active

044444362

ABSTRACT:
A hydraulic pressure control valve for use in a vehicle hydraulic braking system having first and second pressure circuits include a common valve housing, first and second pressure control mechanisms including respectively stepped pistons, valve mechanisms and inlet and outlet chambers, a spring force controlling pressure chamber normally connected to the inlet chamber of the first pressure control mechanism and transmitting the force of a spring to the pistons of the both mechanisms, and an inertia valve arranged in a passage connecting the inlet chamber of the first mechanism and the spring force controlling pressure chamber. The inertia valve closes when the deceleration of the braked vehicle exceeds a predetermined level as determined by the loading condition of the vehicle and the pressure in the inlet and outlet chambers in the respective pressure control mechanisms. Thereafter, the pistons move to close respective valve mechanisms and the pressure in respective outlet chambers increases at a rate smaller than the increase in the pressure in the inlet chambers.

REFERENCES:
patent: 3459000 (1969-08-01), Oberthur
patent: 4026607 (1977-05-01), Hess et al.
patent: 4116493 (1978-09-01), Hayashida
patent: 4217005 (1980-08-01), Takata
patent: 4251117 (1981-02-01), Kubota et al.

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