Booster assisted hydraulic master cylinders for vehicle braking

Details Booster assisted hydraulic master cylinders for vehicle braking Booster assisted hydraulic master cylinders for vehicle braking

1982-04-26

1984-08-07

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Pulsator

60581, 60589, 60556, B60T 706

Patent

active

044635621

ABSTRACT:
In a master cylinder assembly the pressure spaces in advance of pedal-operated pistons of two separate master cylinders are interconnected by a transfer passage, and each master cylinder incorporates a boost chamber to which hydraulic fluid from a pressure source is admitted to act on the piston and augment the force applied to the piston by the pedal when the master cylinder is operated. Each master cylinder incorporates a control valve having a valve spool which is normally urged by a spring into a retracted position to close a transfer port providing communication between the pressure space and the transfer passage and to close an inlet port to cut-off communication between the pressure source and the boost chamber. The spool has a pressure-responsive face exposed to the pressure space and, when subjected to pressure in the pressure space in response to operation of the pedal, is operative to urge the spool against the loading of the spring and into an operative position in which the pressure space is placed in communication with the transfer port and the inlet port is placed in communication with the boost chamber.

REFERENCES:
patent: 4006593 (1977-02-01), Edwards
patent: 4178757 (1979-12-01), Ketterling et al.

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