Wiper motor

摘要

A wiper motor (10) comprises: a motor body (11) comprising;a motor case (13) rotatably supporting an end of the motor shaft (17) in the axial direction thereof; a reduction mechanism (26) reducting the speed of rotation of the motor shaft (17) and transmitting the rotation having the reduced speed to a worm wheel (35); and a motion conversion mechanism (29) converting the rotational motion of the worm wheel (35) into a rocking motion and transmitting the rocking motion to an output shaft (28). The position of the output shaft (28) is set up that the axis (C1) of the output shaft (28) is closer to the motor case (13) than the axis (C2) of the worm wheel (35) and farther from the axis (C2) of the worm wheel (35) than the axis (C) of the motor shaft (17).

主权项

1. A wiper motor comprising:
a yoke rotatably supporting one axial end of a motor shaft; a speed reduction mechanism for reducing the speed of rotation of the motor shaft, the speed reduction mechanism comprising a worm rotated by the motor shaft and a worm wheel formed into a substantially disk shape and meshing with the worm, the worm adapted to continuously rotate the worm wheel in a single direction; a gear frame in which the speed reduction mechanism is housed; an output shaft rotatably supported by the gear frame, the output shaft extending parallel to an axial direction of the worm wheel, an axial center of the output shaft being located closer to the yoke than an axial center of the worm wheel in an axial direction of the motor shaft, closer to the worm wheel than an opening end face of the yoke, and away from the axial center of the worm wheel in a direction away from an axis of the motor shaft; and a motion conversion mechanism contained in the gear frame, and converting a continuous rotational motion of the worm wheel in the single direction into a swinging motion and transmitting the swinging motion to the output shaft.