Motor with reduction gear

Abstract

A wiper motor which can prevent an impact force from greatly acting on attaching parts is provided. A gear cover formed in a substantially inverted y-plate shape is fastened to an opening of a gear case of the wiper motor used in a rear wiper device so as to cover a worm reduction gear and a crank device. A gravity center of a motor part and a gear part is disposed within an area of a triangle formed by a first attaching part, a second attaching part, and a third attaching part, which are formed at three end portions of the inverted y-plate shape of the gear cover. The first attaching part is disposed on an extension line of the rotation axis, and the rotation axis is disposed at a position where a segment connecting the second attaching part and the third attaching part is divided into half. A wiper shaft is disposed on an opposite side to the third attaching part with respect to a segment connecting the first attaching part and the second attaching part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a wiper motor according to an embodiment of the present invention;

FIG. 2 is a rear view thereof;

FIG. 3 is a rear view showing a state that a gear cover is removed;

FIG. 4 is a partially broken side view showing an attaching state of the wiper motor to a tailgate; and

FIG. 5 is a perspective view showing a wiper motor according to a second embodiment of the present invention.

Claims

1. A motor with a reduction gear, the motor comprising: a motor part having an electric motor;a gear part having a reduction gear which is housed in a bottomed gear case coupled to the motor part and deaccelerates rotation of a rotation axis of the electric motor to transmit it to an output shaft; anda gear cover covering an opening of the gear case,wherein a first attaching part, a second attaching part, and a third attaching part are formed respectively at three positions located in a periphery of the gear cover, and a gravity center of the motor part and the gear part is disposed within an area of a triangle connecting the three attaching parts.

2. The motor with a reduction gear according to claim 1, wherein the first, second, and third attaching parts are formed in a same plane.

3. The motor with a reduction gear according to claim 1, wherein the first attaching part is disposed on an extension line of the rotation axis, and the rotation axis is disposed at a position where a segment connecting the second attaching part and the third attaching part is divided into half.

4. The motor with a reduction gear according to claim 1, wherein the output shaft is inserted into an insertion hole formed in an object to be attached to the motor with a reduction gear and is supported by an elastic member fitted to the insertion hole.

5. The motor with a reduction gear according to claim 1, wherein the output shaft is disposed on an opposite side to the third attaching part with respect to a segment connecting the first attaching part and the second attaching part.

6. The motor with a reduction gear according to claim 2, wherein the first attaching part is disposed on an extension line of the rotation axis, and the rotation axis is disposed at a position where a segment connecting the second attaching part and the third attaching part is divided into half.

7. The motor with a reduction gear according to claim 2, wherein the output shaft is inserted into an insertion hole formed in an object to be attached to the motor with a reduction gear and is supported by an elastic member fitted to the insertion hole.

8. The motor with a reduction gear according to claim 3, wherein the output shaft is inserted into an insertion hole formed in an object to be attached to the motor with a reduction gear and is supported by an elastic member fitted to the insertion hole.

9. The motor with a reduction gear according to claim 2, wherein the output shaft is disposed on an opposite side to the third attaching part with respect to a segment connecting the first attaching part and the second attaching part.

10. The motor with a reduction gear according to claim 3, wherein the output shaft is disposed on an opposite side to the third attaching part with respect to a segment connecting the first attaching part and the second attaching part.

11. The motor with a reduction gear according to claim 4, wherein the output shaft is disposed on an opposite side to the third attaching part with respect to a segment connecting the first attaching part and the second attaching part.