JP2003199281A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure that seals the draw-in part of a lead wire to a motor. <P>SOLUTION: The motor comprises a lead plate 8 continuing to a brush inside a bracket 2 and the lead wire 14 continuing to the lead plate 8, and also is formed with a wire draw-out part 2k that draws out the lead wire 14 to the bracket 2. In the motor, the wire draw-in part 2i that draws in a core wire 25, which is drawn out of a coating 24 of the lead wire 14 to the inside of the bracket 2, to the bracket 2 is formed, and a mold material (sealing means) 27 that surrounds and seals the circumference of the core sire 25 that is drawn in to the inside of the bracket 2 from the wire draw-in part 2i. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator motor or generator seal structure.

[0002]

2. Description of the Related Art As a conventional commutator motor, as disclosed in, for example, Japanese Patent Laid-Open No. 2001-25184, as shown in FIGS. 3 and 4, a metal bracket 52 for closing an opening end of a cylindrical yoke is provided. A magnet fixed in the yoke, a rotor shaft rotatably provided in the yoke by a bearing 58, a commutator fixed to the rotor shaft, and a brush device 60 for supplying current to the commutator.
And are placed. A grommet 56 is fitted in the notch 55 of the bracket 52, and a lead wire 57 penetrating the grommet 56 is connected to the brush device 60.

The brush device 60 includes a base 66 in which a lead plate 53 is embedded by insert molding.
A metal box-shaped brush holder 61 fixed to the base 66, a brush 63 held in the brush holder 61 and abutting against the commutator by a spring 62, and one end of each brush 63 is connected. The other end is the lead plate 53
And a copper braided wire 64 connected thereto. Base 66 is 2
It is fastened to the bracket 52 via a book screw 54.

[0004]

By the way, when it is necessary to seal the inside of the motor due to the specification environment or the like, as shown in FIG. 5, the bracket 52 is formed with a wire take-out portion 52a through which the lead wire 57 is inserted. This wire take-out section 52
The molding material 59 is filled in the space a between the lead wire 57 and the lead wire 57, and the sealing is performed.

However, even if the molding material 59 seals the gap between the lead wire 57 and the bracket 52, moisture enters the coating 67 from the end of the lead wire 57 as shown by the arrow, and the coating 67 and a number of thin wires. There is a possibility that it will flow between the core wires 68 made of copper wires due to the capillary phenomenon and enter the motor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a seal structure for sealing a lead-in portion of a lead wire with respect to a motor.

[0007]

According to a first aspect of the present invention, a rotor rotatably provided inside a bracket, a commutator electrically connected to a winding of the rotor, a brush slidably contacting the commutator, and a brush electrically connected to the brush. In a motor that includes a lead plate and a lead wire that conducts to the lead plate, and in which the bracket has a wire lead-out portion through which the lead wire is taken out, pull the core wire, which is taken out from the lead wire coating, into the bracket. The wire drawing portion is formed, and the wire drawing portion is provided with a sealing means that wraps around the core wire drawn into the inside of the bracket and seals the core wire.

According to a second aspect of the present invention, in the first aspect of the present invention, a connecting portion of the core wire to the lead plate is provided inside the bracket, and the sealing means includes a first sealing portion that wraps between the bracket and the core wire, the core wire and the lead plate. And a second sealing portion that wraps the space between them.

A third aspect of the invention is characterized in that, in the second aspect, the sealing means includes a third sealing portion that wraps between the lead plate and the bracket.

According to a fourth aspect of the invention, in the second or third aspect of the invention, the wire lead-in portion is formed offset from the lead plate, and a gap is formed between the core wire drawn from the wire lead-in portion and the lead plate. It is characterized by that.

[0011]

According to the first aspect of the present invention, the sealing means wraps and seals around the core wire which the molding material has come out of the coating of the lead wire, so that the end portion of the lead wire (not shown) on the power supply side is covered in the coating. It is prevented that the entered water flows into the motor by flowing between the coating and the core wire due to the capillary phenomenon, so that the leakage of electric current in the motor can be prevented.

In the second invention, the first sealing portion wraps between the core wires of the bracket 2 and the second sealing portion wraps between the core wire and the lead plate, so that the space between the coating and the core wire is passed into the motor. Blocks water that attempts to enter.

According to the third aspect of the present invention, the third sealing portion wraps between the lead plate and the bracket, so that the moisture that enters the motor through the gap between the lead plate and the bracket is blocked.

According to the fourth invention, a gap is provided between the lead wire extending from the lead plate to the wire drawing portion and the lead plate, and the first to third sealing portions are formed in an annular shape through the gap. Thereby, the sealing property can be improved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, FIG. 1 shows an example of a motor to which the present invention is applicable. This motor has, as a basic structure, a cylindrical metal yoke 1 having a bottom and forming a case outside the motor,
The bracket 2 for closing the opening of the yoke 1 and the yoke 1
A pair of magnets (permanent magnets) fixed inside the table 3
A rotor (armature) 4 that rotates inside the magnet 3; and a shaft 5 that rotatably supports the rotor 4 via bearings 15 and 16.

The yoke 1 and the bracket 2 are fastened to a motor mounting member (not shown) via a plurality of bolts. As shown in FIG. 2, the bracket 2 includes a base portion 2a that is substantially orthogonal to the rotation center axis of the rotor 4, and a cylindrical portion 2c that extends in the rotation center axis direction of the rotor 4 and fits on the inner peripheral surface of the yoke 1.
And a bearing bracket 2 for supporting the bearing 16
d and the like, which are integrally molded with resin.

An oil seal 19 is attached to the bracket 2 via a cap 20. This oil seal 19
Slides on the shaft 5 to seal the insertion portion of the shaft 5 with respect to the cap 20.

In the motor, electricity supplied from a power source (not shown) through the lead wire 14 flows through the winding wire 6 of the rotor 4, so that the magnetic force of the magnet 3 acts on the rotor 4 in the rotating direction to rotate the shaft 5. Driven. A commutator 7 is attached to the shaft 5 and is electrically connected to the winding 6, and a spring 10 is provided to the commutator 7 so that electricity is supplied to the winding 6 of the rotor 4.
A pair of brushes 11 pressed against each other, and a pair of brush holders 12 that slidably support each brush 11,
A pair of copper braided wires 13 extending from each brush 11, a lead wire 14 electrically connected to a power source, and a pair of lead plates 8 to which the copper braided wires 13 and the lead wires 14 are connected are provided.

The semi-annular lead plates 8 are embedded and integrated in the resin bracket 2 by insert molding. This insert molding is
Each lead plate 8 is placed in a mold, and synthetic resin is injected and molded to integrate each lead plate 8 and the bracket 2.

A wire lead-out portion 2k through which the lead wire 14 is inserted is formed in the bracket 2, and a mold material 9 is filled between the wire lead-out portion 2k and the lead wire 14 and hermetically sealed.

However, the molding material 9 is the lead wire 1
Even if the space between the bracket 4 and the bracket 2 is sealed, the water content of the lead wire 1
From the end (not shown) of 4 into the coating of the lead wire 14,
Capillary phenomenon may flow between the tubular coating and the core wire made up of many thin copper wires to enter the motor. Particularly, in the structure in which the inside of the motor is hermetically sealed via the oil seal 19 or the like, moisture is sucked into the motor through the coating of the lead wire 14 due to the suction action due to the temperature drop generated after the operation of the motor is stopped. There is a possibility that

In response to this, the present invention provides a sealing means for sealing the wrapping of the core wire that comes out of the coating of the lead wire to prevent moisture from entering the motor through the inside of the coating. That is the summary. The embodiment shown in FIG. 2 will be described below as a specific example thereof.

In the present embodiment, the wire lead-out portion 2k for inserting the coating 24 of the lead wire 14 into the bracket 2, the wire lead-in portion 2i for drawing the core wire 25 of the lead wire 14 into the bracket 2, and the lead plate 8 are provided. It has an opening 2j which is exposed and accommodates the connecting portion 25a of the core wire 25 with respect to the lead plate 8, and an opening 2m which is located behind the lead plate 8 with respect to this opening 2j.

The connecting portion 25a of the core wire 25 to the lead plate 8 is formed by spot welding. This spot welding is performed via welding electrodes inserted into the openings 2j and 2m, respectively. The joint portion 25a is not limited to welding, but may be formed by soldering or the like.

A molding material 26 is filled in the wire extraction portion 2k of the bracket 2. The molding material 26 seals between the bracket 2 and the coating 24 of the lead wire 14.

As the sealing means of the present invention, a mold material 27 is filled in the opening 2j of the bracket 2. The molding material 27 seals between the bracket 2, the core wire 25 of the lead wire 14, and the lead plate 8. That is, the molding material 27 wraps the first sealing portion 27 a that wraps between the bracket 2 and the core wire 25, the second sealing portion 27 b that wraps between the core wire 25 and the lead plate 8, and wraps between the lead plate 8 and the bracket 2. It has 3rd sealing part 27c, respectively.

The wire lead-in portion 2i of the bracket 2 is formed offset with respect to the lead plate 8, and the core wire 25 drawn from the wire lead-in portion 2i and the lead plate 8 are formed.
A gap is provided between the two, and the first to third sealed portions 27a to 27c are formed in an annular shape through the gap.

With the above construction, the operation will be described.

In the motor, the current supplied from the lead wire 14 causes the lead plate 8, the copper braided wire 13, the brush 11,
By flowing through the commutator 7 to the winding 6, the rotor 4
The magnetic force of the magnet 3 acts in the rotating direction to drive the shaft 5 to rotate.

As the sealing means of the present invention, the molding material 27 is used.
Wraps around and seals around the core wire 25 that has come out of the coating 24 of the lead wire 14, so that the water that has entered the coating 24 from the end portion of the lead wire 14 on the power supply side (not shown) will pass between the coating 24 and the core wire 25. Capillary action stops the flow and entry into the motor.

In the molding material 27, the first sealing portion 27a wraps the space between the core wires 25 of the bracket 2 and the second sealing portion 27b wraps the space between the core wire 25 and the lead plate 8. It blocks the water that tries to enter into the motor through.

In the molding material 27, the third sealing portion 27c wraps between the lead plate 8 and the bracket 2,
The moisture that tries to enter the motor through the gap between the lead plate 8 and the bracket 2 is blocked. If the lead plate 8 and the bracket 2 are hermetically sealed,
The third sealing portion 27c may not be provided.

A gap is provided between the lead plate 8 and the core wire 25 extending from the lead plate 8 to the wire lead-in portion 2i, and the first to third sealing portions 27a to 27 are provided via this gap.
Since c is formed in an annular shape, the sealing performance can be improved.

The present invention is not limited to motors, but can be applied to rotary electric machines such as generators.

It is obvious that the present invention is not limited to the above-mentioned embodiments and various modifications can be made within the scope of the technical idea thereof.

[Brief description of drawings]

FIG. 1 is a sectional view of a motor showing an example to which the present invention is applicable.

FIG. 2 is a sectional view of a sealing structure showing an embodiment of the present invention.

FIG. 3 is a front view of a conventional brush device.

FIG. 4 is a cross-sectional view taken along the line DD of FIG.

FIG. 5 is a sectional view of the same sealing structure.

[Explanation of symbols]

1 York 2 bracket 2k line take-out section 2i wire drawing part 2j, 2m opening 3 magnets 4 rotor 5 shafts 6 windings 7 commutator 8 lead plate 9 Mold material 14 lead wire 24 coating 25 core wire 25a connection part 27 Mold material 27a First sealing portion 27b Second sealing part 27c Third sealed part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoichi Ikunuma             2-4-1, Hamamatsucho, Minato-ku, Tokyo World Trade             Center Building Kayaba Industry Co., Ltd. F term (reference) 5H605 AA02 BB05 BB09 CC02 CC06                       EC01 EC08 GG02 GG18

Claims (4)

[Claims] 1. A rotor rotatably provided inside a bracket, a commutator conducting to a winding of the rotor, a brush slidingly contacting the commutator, a lead plate conducting to the brush, and a lead conducting to the lead plate. And a wire lead-out portion for taking out the lead wire to the outside in a bracket, wherein the bracket has a wire lead-in portion for drawing the core wire drawn from the coating of the lead wire into the inside of the bracket. The motor according to claim 1, further comprising: a sealing means that wraps and seals around a core wire drawn from the wire drawing portion to the inside of the bracket. 2. The bracket includes a connecting portion for connecting the core wire to the lead plate, wherein the sealing means includes a first sealing portion for wrapping between the bracket and the core wire, and wrapping between the core wire and the lead plate. The motor according to claim 1, further comprising a second sealing portion. 3. The motor according to claim 2, wherein the sealing means includes a third sealing portion that wraps between the lead plate and the bracket. 4. The wire drawing portion is formed to be offset from the lead plate, and a gap is formed between the core wire drawn from the wire drawing portion and the lead plate. The motor according to item 3.