Park brake actuating mechanism for a power transmission
AssigneeGeneral Motors Corporation
InventorsBruce Edward Crum, Michael Rust Toole, Thomas Lynn Bishop, Rayman Eton Bazilio
Life of this patent
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Abstract
Power transmissions of the automatic shifting type have a park gear secured with the transmission output shaft such that the operator can select the park position to maintain the vehicle immobile. A park pawl is pivotally mounted within the transmission housing to selectively engage the park gear. Selective engagement and disengagement of the park gear by the park pawl is controlled by the vehicle operator through manipulation of the linearly movable actuator which is connected to an operator controlled detent plate.
Claims5
A parking mechanism with a pawl and an actuator, said mechanism comprising:
- a reaction pin having a longitudinal axis and a substantially conical ramp disposed oblique to the longitudinal axis;
- a pawl pivotally mounted substantially perpendicular to said reaction pin on a pivot axis substantially parallel with and laterally displaced from said longitudinal axis of said reaction pin, a traverse ramp formed on an outer longitudinal surface in a plane oblique to the longitudinal axis of the pin;
- and
- an actuator supported for linear motion substantially parallel with the longitudinal axis of the pin comprised of a cage and a pair of rollers enclosed within said cage abutting said ramps of said pawl and said reaction pin respectively when the parking pawl is actuated, each said roller having an outer peripheral surface defined by a concave surface and a pair of spaced cylindrical surfaces intersecting the concave surface and cooperating therewith to define the contact surfaces abutting said ramps.
Dependencies are inferred from the claim text.