| 摘要 |
The actuator for a door locking apparatus for a vehicle has an output shaft rotatably mounted on the body thereof, a cylindrical worm designed to be rotated by a motor, and a shaft tube having an internal toothed portion that is brought into mesh engagement with the cylindrical worm and designed to move between locked and unlocked positions along the axial direction of the worm when the worm is rotated. An elongate hole is formed in the arm fixed to the output shaft, and the pin of the shaft tube is brought into engagement with this elongate hole. A projection is provided on the shaft tube at such a position as to be closer to the output shaft than the pin is. The actuator has a torsion spring for returning the shaft tube from the locked or the unlocked position to a neutral position as an intermediate position between the two positions when the motor is switched off. The coil portion of the torsion spring is wound around the outer circumference of the output shaft, and the two legs of the torsion spring are crossed each other, and are thereafter brought into engagement with the projection and a fixed locking piece.
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