| 摘要 |
A parking brake for use with an automatic power transmission mechanism having a parking gear which is engaged or disengaged by a brake pawl with or from a brake pawl upon shifting movement of a rotary shaft through a mechanical linkage. A cam member is rotatably mounted around the rotary shaft and is operatively connected thereto by a torsion spring. Rotation of the rotary shaft in one direction causes rotation of the cam member in the same direction to move the brake pawl into engagement with the parking gear thereby locking it against rotation in either direction. If the tooth of the brake pawl is misaligned with respect to a space between two adjacent teeth of the parking gear, the torsion spring yields and exerts a pressure on the brake pawl that tends to urge it toward the braking or locking position. When the parking gear moves slightly, the spring force will snap the brake pawl into braking position.
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