Hydraulic braking pressure control system

Details Hydraulic braking pressure control system Hydraulic braking pressure control system

1990-11-13

1992-03-31

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303113R, 303 963, B60T 840

Patent

active

051002116

ABSTRACT:
A hydraulic braking pressure control system which includes a sleeve slidably received in a housing with opposite ends facing an output chamber connected to a brake device, and a pilot chamber connected to a control hydraulic pressure source. A control piston is slidably received in the sleeve, with one end of the control piston facing the output chamber and the other end facing a control chamber connected to the control hydraulic pressure source through a lock valve which is adapted to be closed in response to the movement of the sleeve, in a direction to increase the volume of the output chamber. A cut-off valve located between an input chamber leading to a master cylinder and the output chamber includes a valve member having a maximum amount of movement in a seating direction which is regulated to a position of the valve member spaced apart from a valve seat when a valve seat member follows movement of the sleeve in a direction to reduce the volume of the pilot chamber to the maximum amount. This ensures that the opening of the cut-off valve and tight closing of the control chamber upon an abnormal reduction of the control hydraulic pressure from the control hydraulic pressure reduction source can be achieved with a simplified system.

REFERENCES:
patent: 4017126 (1977-04-01), Ohta
patent: 4322114 (1982-03-01), Maehara
patent: 4890891 (1990-01-01), Leiber
patent: 4929036 (1990-05-01), Iwagawa et al.

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