JPH0660277U - Wiper motor holder base mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a holder base mounting structure of a wiper motor, which can stabilize the mounting posture of the holder base and can prevent noise and adverse effects on the rotation speed. [Structure] A holder base 6 supporting a brush 10 is attached to a gear case 3 via cushion rubbers 7, 7, and a damper block 9 is sandwiched between the holder base 6 and the gear case 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper motor with a built-in reduction mechanism used for driving a wiper, and more specifically, a holder for mounting a holder base that supports a brush that supplies current to an armature through a commutator to a gear case. This relates to the base mounting structure.

[0002]

[Prior art]

 Conventionally, as the wiper motor as described above, a motor case accommodating an armature and a gear case accommodating a reduction mechanism that meshes with a worm provided on an armature shaft of the armature to decelerate the rotation of the armature and output the rotation. There is a structure in which the opening end side of the motor case is screw-joined.

In such a wiper motor, the commutator of the armature is located near the opening end of the motor case, and is held by a brush holder provided in a holder base mounted on the motor case side of the gear case. When the brush is brought into contact with the commutator, a current is supplied to the armature coil, and the armature is rotated.

The holder base has a floating structure that is attached to the gear case via a cushion rubber, which absorbs vibration generated when the brush comes into contact with the commutator of the rotating armature. To reduce noise and to make the armature rotate smoothly.

[0005]

[Problems to be solved by the device]

 However, in the conventional wiper motor described above, since the holder base has a floating structure made of cushion rubber, it cannot be said that the holder base sometimes does not excessively tilt. , The contact state of the brush with the commutator cannot be maintained well, and the specified number of rotations cannot be obtained, or rather the noise becomes louder. There is a problem that it does not rotate, and the solution to these problems has been a problem in this type of wiper motor.

[0006]

[The purpose of the device]

 This invention was made with attention to the above-mentioned problems in the conventional wiper motor, and can stabilize the mounting posture of the holder base of the floating structure, thereby preventing noise generation and adverse effect on rotation of the armature. It is an object of the present invention to provide a holder base mounting structure of a wiper motor that can be used.

[0007]

[Means for Solving the Problems]

 A holder base mounting structure of a wiper motor according to the present invention is a wiper motor in which a gear case accommodating a speed reduction mechanism for decelerating the rotation of the armature is fixed to a motor case accommodating the armature, and a commutator of the armature. A holder base that supports a brush that contacts the armature and supplies current to the armature is attached to the gear case via cushion rubber, and a damper block is sandwiched between the holder base and the gear case. This is the feature of the present invention, and such a structure of the holder base fixing structure of the wiper motor is used as a means for solving the above-mentioned conventional problems.

[0008]

[Function of the device]

 In the holder base mounting structure of the wiper motor according to the present invention, the holder base supporting the brush is mounted on the gear case side via the cushion rubber, and the damper block is sandwiched between the holder base and the gear case. Despite the floating structure, the attitude of the holder base is stabilized and the holder base is not tilted, so good contact between the brush and commutator is maintained, and noise is prevented. , The rotation speed will not change.

[0009]

【Example】

 The invention will be described below with reference to the drawings.

1 and 2 are for explaining an embodiment of a holder base mounting structure of a wiper motor according to the present invention, and FIG. 1 is a cross-sectional view showing a structure of a wiper motor to which the mounting structure is applied. FIG.

The wiper motor 1 shown in FIG. 1 has a structure in which a gear case 3 is fixed to an opening end 2a (left side in the drawing) of a motor case 2 having a cylindrical shape by a screw (not shown).

An armature 4 is housed in the motor case 2, and an armature shaft 4 a of the armature 4 penetrates an opening 3 a of the gear case 3 and a bearing metal 3 b provided in the opening 3 a. It is rotatably supported by a bearing metal (not shown) housed at the right end of the motor case 2 in the drawing. Further, the armature shaft 4a is provided with a commutator 4b at the center thereof, and a worm 5a is formed at the tip end protruding into the gear case 3.

A holder base 6 is attached to the end surface of the gear case 3 on the motor case side by pins 8 and 8 via cushion rubbers 7 and 7. A damper block 9 made of hard rubber is sandwiched at a position different from the cut surface of No. 1 (see FIG. 2).

As shown in FIG. 2, the holder base 6 is made of resin and has a hollow disk shape. The holder base 6 is provided with three brush holders 6 a on the upper surface side in the drawing, and has a connector on the lower surface side. The brush 10 held in the brush holder 6a is urged toward the center by an urging means (not shown) and abuts against the commutator 4b of the armature 4. ing. Each brush 10 is electrically connected via a pigtail 6f to a conductive plate 6c, 6d, 6e arranged in a state where one end side is accommodated in the connector portion 6b, and at the connector portion 6b. A current is supplied through a connected terminal plate (not shown) for external wiring connection, and the current is supplied to the coil of the armature 4 through the conductive plates 6c, 6d, 6e, the pigtail 6f, the brush 10 and the commutator 4b. By flowing, the armature 4 is rotated.

On the other hand, a worm wheel 5b fixed to the output shaft 11 is accommodated in the gear case 3, and meshes with the worm 5a formed on the armature shaft 4a to form the speed reduction mechanism 5, The rotation of the armature 4 is decelerated and the wiper device connected to the output shaft 11 is driven.

Next, the procedure for attaching the holder base 6 to the gear case 3 in the wiper motor 1 having the above structure will be described in more detail with reference to FIG.

In FIG. 2, circular cutouts 6g, 6g for fitting the cushion rubber 7 are provided on the peripheral edge of the holder base 6, and an outer peripheral edge is formed on the peripheral edge of the connector section 6b. A rectangular protrusion 6h slightly protruding to the side is formed. On the other hand, on the motor case side end surface of the gear case 3, holes 3c, 3c into which a pin 8 for attaching the holder base 6 to the gear case 3 via a cushion rubber 7 are press-fitted are formed, and the holder A recess 3d for receiving the lower end of the damper block 9 is provided at a position corresponding to the rectangular projection 6h of the base 6, and the connector 6b is provided at a position corresponding to the connector 6b of the holder base 6. A rectangular hole 3e for insertion is formed.

As shown in the figure, the cushion rubber 7 has a grommet shape made of soft rubber, and the damper block 9 has a cylindrical shape made of hard rubber as described above. The damper block 9 may be spherical.

When the holder base 6 is attached to the gear case 3, first, the damper block 9 is set in the recess 3d of the gear case 3, and then the cushion rubbers 7 and 7 are fitted into the circular notches 6g and 6g, respectively. The holder base 6 is placed on the end surface of the gear case 3 on the side of the motor case while inserting the connector portion 6b of the holder base 6 in this state into the rectangular hole 3e of the gear case 3.

Then, the holder base 6 is attached to the gear case 3 by press-fitting the pins 8, 8 which are passed through the screw insertion holes 7 a, 7 a of the cushion rubber 7, 7 into the holes 3 c, 3 c provided in the gear case 3.

The connector portion 6b of the holder base 6 penetrates the rectangular hole 3e, penetrates the rectangular hole 3e from the motor case 2 side, and projects into the gear case 3, so that the wiper motor 1 is completely assembled. In the above, the structure is connected to the terminal plate for external wiring connection provided on the gear case 3 side, and as described above, the power source for driving the motor is supplied from the external wiring through the terminal plate. A current flows through the coil of the armature 4 via the brush 10 and the commutator 4b.

In the above embodiment, the example in which only one damper block 9 is provided is shown, but in the present invention, the number of the damper block is not limited to one, but may be changed as necessary. It is also possible to install two or more.

[0023]

[Effect of device]

 As described above, in the holder base mounting structure of the wiper motor according to the present invention, since the holder base has the floating structure mounted on the gear case via the cushion rubber, the vibration of the holder base due to the rotation of the armature is prevented. It is possible to effectively absorb and reduce noise, and the damper block prevents the holder base from tilting, so that it is possible to prevent fluctuations in the number of revolutions and generation of abnormal noise. Further, since the damper block regulates the inclination of the holder base, it is possible to use a softer cushion rubber having a low rigidity, thereby further enhancing the noise prevention effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a main part showing a structure of a wiper motor to which an embodiment of a holder base mounting structure of a wiper motor according to the present invention is applied.

FIG. 2 is a perspective explanatory view showing how to attach a holder base to the gear case of the wiper motor shown in FIG.

[Explanation of symbols]

 1 Wiper Motor 2 Motor Case 3 Gear Case 4 Armature 4b Commutator 5 Reduction Mechanism 6 Holder Base 7 Cushion Rubber 9 Damper Block 10 Brush

Claims (1)

[Scope of utility model registration request] 1. A wiper motor comprising a motor case accommodating an armature and a gear case accommodating a speed reduction mechanism for decelerating and outputting the rotation of the armature, wherein the armature commutator is brought into contact with the armature and a current is applied to the armature. A holder base mounting structure for a wiper motor, characterized in that a holder base that supports a brush that supplies the brush is attached to the gear case via a cushion rubber, and a damper block is sandwiched between the holder base and the gear case.