JPH07194066A - Mechanism of positioning lead wire for brush of motor - Google Patents

Abstract

PURPOSE:To simplify the positioning work of a lead wire during assembling of a motor, and also, to secure the insulation properly. CONSTITUTION:A brush holder stage 5 is fixed to the end face on a motor casing of the bracket 4 attached to the opening end of a motor casing, and a brush 7 is supported by the brush holder 6 provided on the brush holder stay 5. The bracket is provided with a hole, and a lead wire 9b is led into the opposite side of a bracket from a brush, and it is put out to motor casing side through the brush hole 7. The middle of the cover of the lead wire 9b for a brush is positioned, being caught between the slit part 13b and the recess 5a made at the edge of the brush holder stay 5. Accordingly, since the lead wire is led in the direction of the penetration of the bracket, the contact to other members by the bending of the lead wire can be prevented properly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush lead wire positioning structure for a motor, and more particularly to a motor lead wire positioning structure for positioning a brush lead wire provided through a bracket attached to an open end of a motor casing. The present invention relates to a lead wire positioning structure for a brush.

[0002]

2. Description of the Related Art Conventionally, in some DC motors using a brush, a bracket is attached to the open end of the motor casing, and the brush is supported by a brush holder fixed to the bracket. In such a structure in which the lead wire connected to the pigtail of the motor is pulled out to the outside of the motor casing, a grommet is interposed between the motor casing and the bracket and pulled out.

In the motor device having the above structure, since the lead wire is arranged inside the motor casing of the bracket, the lead wire and other conductive material are provided in the path of the lead wire from the grommet to the brush. It is necessary to draw it in consideration of insulation with the flexible member. Further, it is necessary to hold the lead wire while ensuring the flexibility of the pigtail portion, which complicates the lead wire support structure of the bracket and the brush holder stay, and complicates the lead wire positioning operation during motor assembly. was there.

[0004]

In view of the above problems of the prior art, the main object of the present invention is to make it possible to simplify the lead wire positioning operation during motor assembly and to ensure good insulation. It is to provide a lead wire positioning structure for a brush of a motor.

[0005]

According to the present invention, such an object has a bracket attached to an open end of a motor casing and a brush holder for supporting a brush, which is integrated with the bracket. A brush holder stay fixed to the motor casing side, the bracket having a size through which the brush can be inserted and cooperating with an outer edge of the brush holder stay at the time of fixing the bracket. It has a through hole formed so as to sandwich and position the covering portion of the lead wire, and the lead wire is pulled out to the side of the bracket opposite to the brush side through the through hole. It is achieved by providing a lead wire positioning structure for a brush of a motor.

[0006]

With this configuration, the bracket can be pulled out to the brush side from the side opposite to the brush side through the through hole, and the pulled out portion can be held between the outer edge of the brush holder stay and the through hole. Since the positioning is performed, it is possible to omit a guide and a positioning portion for routing the lead wire inside the motor casing of the bracket.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a partially exploded vertical sectional view of a permanent magnet field type motor to which the present invention is applied. In FIG. 1, for example, a pair of permanent magnets 2 each having an arc shape are arranged on the inner peripheral surface of a motor casing 1 as a bottomed cylindrical yoke at symmetrical positions with respect to the motor axis. A motor output shaft 3, which is a shaft of a rotor (not shown) received therein, projects axially outward at the left open end of the motor casing 1 in the drawing.

A disk-shaped bracket 4 is attached to the opening end surface of the motor casing 1 so as to shield the opening. A brush holder stay 5 is fixedly provided on the end surface of the bracket 4 on the motor casing 1 side. In this embodiment, the brush 7 is integrally mounted on the brush holder stay 5 and is supported by a pair of brush holders 6. Are arranged in symmetrical positions. The brush holder stay 5 is made of an insulating synthetic resin material, but the bracket 4 is made of a metal member to improve heat dissipation.

Further, in the present motor device, for example, a torque sensor unit 8 as a motor accessory electric component is attached to an end surface of the bracket 4 opposite to the motor casing 1 side. A pair of terminals 8a, for example, are provided on the end surface of the torque sensor unit 8 on the bracket 4 side, and the terminal 8a is attached to the end surface of the bracket 4 on the torque sensor unit 8 side when the torque sensor unit 8 is attached.
An annular wall 10 is formed for receiving the sensor lead wire 9a and the brush lead wire 9b as the accessory lead wires connected to the terminal 8a and the terminal 8a.

In the middle part of the lead wires 9a and 9b,
As shown in FIG. 2 together, the annular wall 10 is assembled when assembled.
The grommet 11 is fitted at a position where the grommet 11 is crossed. The annular wall 10 is formed with a recessed portion 12 which cooperates with the torque sensor unit 8 to mount the grommet 11 and which has a complementary shape.

The bracket 4 is provided with an escape hole 13 for the brush holder 6 as a through hole.
The area of the hole 13 is formed to be large enough to pass the brush 7 connected to the brush lead wire 9b facing the torque sensor unit 8 side as described above.
Further, a hole 14 is formed in the bracket 4 as a through hole as an escape for insulation from the terminal 8a of the torque sensor unit 8.

In the motor device constructed as described above, the torque sensor unit 8 is attached to the motor casing 1 by being screwed through the bracket 4 as shown in FIG. There is. First, the sensor lead wire 9a is connected to the terminal 8a of the torque sensor unit 8.
Is soldered, a grommet 11 is fitted so as to bundle the sensor lead wire 9a and the brush lead wire 9a, and the brush 7 is formed into a hole 13 as shown by an arrow A in FIG.
And put it on the other side of the bracket 4.

As described above, since both the lead wires 9a and 9b are arranged on the side of the bracket 4 opposite to the side on which the brush is mounted, it is necessary to take the brush 7 to the side of the motor casing 1 of the bracket 4. The bracket 4 of the present invention is provided with the hole 13 as described above, and the brush 7 and the lead wire 9b for the brush can be led out to the motor casing 1 side of the bracket 4 through the hole 13. Also, hole 1
A part of 3 is formed so as to extend in a narrow width as shown in FIG. The slit portion 1 formed by the extension
By lightly inserting the middle portion of the coating portion of the brush lead wire 9b into 3a, the brush lead wire 9b is temporarily held and is then held.
Can be temporarily fastened by being sandwiched by the slit portions 13a (FIG. 3).

Next, as shown in FIG. 4, the brush holder stay 5 is fixed to the bracket 4 by screwing, and the brush 7 is attached to the brush holder 6. Further, a curved concave portion 5a is formed at the edge of the portion of the brush holder stay 5 corresponding to the end portion 13b of the slit portion 13a,
At the time of fixing, the end of the slit portion 13a as the through hole and the recessed portion 5a as the outer edge of the brush holder stay 5 are provided.
Of the brush lead wire 9b can be positioned and fixed by sandwiching the intermediate portion of the covering portion of the brush lead wire 9b therebetween. Then, as shown in FIG. 1, the torque sensor unit 8 is screwed to the outward flange of the opening end of the motor casing 1 so that the bracket 4 is tightened together, and the motor device is assembled. At this time, the terminal 8a of the torque sensor unit 8 is connected to the bracket 4
Of the terminal 8a.
A short circuit due to electrical contact between the bracket 4 and the bracket 4 can be completely avoided.

In this way, it is possible to easily position and fix the intermediate portion (covering portion) of the brush lead wire 9b which is extended from the opposite side of the bracket 4. Since the brush lead wire 9b extends in the direction of penetrating the bracket 4 and is sandwiched and fixed between two members, the amount of elastic deformation of the brush lead wire 9b can be suppressed, and the fixing position can be set to the brush position. The contact with the brush holder 6 due to the curved bending of the pigtail portion of the work lead wire 9b near the brush can be set appropriately in the vicinity of the brush holder 6 without much consideration. Similarly, it is possible to prevent the pigtail portion from bending and coming into contact with the bracket 4, and as described above, the metal bracket 4 can be used,
A large heat radiation effect can be obtained by the metal bracket 4.

As described above, according to the present invention, the brush lead wire can be pulled out to the brush side from the side of the bracket opposite to the brush side through the through hole, and the pulled out portion can be held by the brush holder stay. Since it is sandwiched and positioned by the outer edge and the through hole, its fixed position can be set in the vicinity of the brush, and the lead wire leading structure inside the motor casing of the bracket can be omitted, and the lead-out direction is Since it comes along the penetrating direction of the bracket, it is possible to preferably prevent contact with other members due to bending of the lead wire.

[Brief description of drawings]

FIG. 1 is a partially exploded vertical sectional view of a permanent magnet field type motor to which the present invention is applied.

FIG. 2 is a diagram showing a part of an assembling procedure of a motor device to which the present invention is applied.

FIG. 3 is a diagram showing a part of an assembling procedure of a motor device to which the present invention is applied.

FIG. 4 is a view showing an assembled state of a bracket and a brush holder stay according to the present invention.

[Explanation of symbols]

 1 Motor Casing 2 Permanent Magnet 3 Motor Output Shaft 4 Bracket 5 Brush Holder Stay 5a Recessed Part 6 Brush Holder 7 Brush 8 Torque Sensor Unit 8a Terminal 9a Sensor Lead Wire 9b Brush Lead Wire 10 Annular Wall 11 Grommet 12 Recessed Part 13 holes 13a slit part 13b terminal part 14 hole

Claims (1)

[Claims] 1. A bracket attached to an opening end of a motor casing, and a brush holder stay integrally provided with a brush holder for supporting a brush and fixed to the motor casing side of the bracket, The bracket is formed in such a size that the brush can be inserted therethrough, and cooperates with an outer edge of the brush holder stay at the time of the fixing, so that the cover portion of the lead wire of the brush can be clamped and positioned. A lead wire positioning structure for a motor, wherein the lead wire is drawn out to a side of the bracket opposite to the brush side through the through hole.