Hydraulic brake actuator comprising electrically actuable...

Details Hydraulic brake actuator comprising electrically actuable... Hydraulic brake actuator comprising electrically actuable...

2007-03-13

2007-03-13

Schwartz, Chris (Department: 3683)

Brakes

Wheel

Axially movable brake element or housing therefor

Reexamination Certificate

active

11054347

ABSTRACT:
In an automotive vehicle braking system, a hydraulic brake actuator includes a wedge for locking a hydraulic piston in a brake position for purposes of applying a park brake. To apply the park brake, hydraulic pressure is increased to advance the piston to urge the brake pads against the rotor. With the piston in the brake position, an electrical solenoid is energized to advance the wedge to engage the piston. The wedge includes an inclined surface that contacts an inclined surface connected to the piston or the housing, with sufficient frictional force to maintain the wedge in the advanced position without requiring hydraulic pressure or electrical power. Thus, the park brake remains applied even when the vehicle is turned off.

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patent: 6311808 (2001-11-01), Halasy-Wimmer et al.
patent: 6315092 (2001-11-01), Schwarz

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