Hydraulic brake actuator
AssigneeGirling Limited
InventorHelmut Heibel
Life of this patent
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Abstract
A hydraulic brake actuator having a piston slidable in a cylinder for hydraulic service brake operation also incorporates a mechanical linkage for handbrake operation. The mechanical linkage comprises a cranked shaft journalled in a closed end wall of the cylinder, a linearly displaceable peg and a strut interconnecting the cranked shaft and peg such that rotation of the cranked shaft causes linear displacement of the peg. The cranked part of the shaft of the strut and the peg are preferably contained wholly within a hydraulic working chamber defined by the piston and cylinder so that when the service brake and handbrake are applied simultaneously, movement of the mechanical components does not cause a change in the volume of the chamber and prevailing hydraulic fluid pressure will not therefore affect such movement.
Claims11
A mechanical actuator for a vehicle brake, comprising a linearly displaceable peg for displacing a friction element, a mechanical actuating member for effecting peg displacement, means mounting said mechanical actuating member for rotation between first and second peg displacement positions about an axis aligned with the direction of peg displacement, a seating in said actuating member and a seating in an adjacent end of said peg, said seatings being off-set with respect to each other, when said actuating member is in its first position, means for preventing movement of said actuating member seating in the direction of peg displacement during movement of said actuating member between its first and second peg displacing positions, and an inclined strut engaging in said seatings and interconnecting said peg and said actuating member, said seating in said actuating member being also off-set with respect to said axis and said axis being off-set with respect to the seating in said peg, whereby rotation of said actuating member about said axis from its first towards its second peg displacing position reduces the inclination of said strut with respect to the direction of said peg displacement and thereby displaces said peg away from said actuating member.
A mechanical actuator for a vehicle brake, comprising a linearly displaceable peg for displacing a friction element, a mechanical actuating member for effecting peg displacement, means mounting said mechanical actuating member for rotation between first and second peg displacing positions about an axis aligned with the direction of peg displacement, a seating in said actuating member and a seating in an adjacent end of said peg, said seatings being off-set with respect to each other, when said actuating member is in its first position, means for preventing movement of said actuating member seating in the direction of said axis during movement of said actuating member between its first and second peg displacing positions and an inclined strut engaging in said seatings and interconnecting said peg and said actuating member, said seating in said actuating member being also off-set with respect to said axis and said axis being off-set with respect to the seating in said peg, whereby rotation of said actuating member about said axis from its first towards its second peg displacing position reduces the inclination of said strut with respect to the direction of said peg displacement and thereby displaces said peg away from said actuating member.
Dependencies are inferred from the claim text.