JP2002320353A - Motor and lead wire connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the insulating properties and the satisfactory operation properties of brushes, to improve the assembly performance of a brush holder, and to easily connect lead wires. SOLUTION: A connected terminal 23 is formed on a feeding plate of a brush holder 18 so as to protrude from the brush holder 18 and a preventive wall 24 is formed near a base end of the connected terminal 23. A recess 15a and a flange 15b are formed on a housing 15, and an arrangement recess 15c is formed in the flange 15b. An arrangement unit 26 comprises the arrangement recess 15c and the preventive wall 24. When the spot welding is carried out, the brush holder 18 side is shielded by a spatter invasion preventive jig and the connected terminals 23, and ends 40a of external lead wires 40 are arranged in the arrangement unit 26 so as to overlap each other. A welding electrode is inserted into a through-hole 27 and the spot welding is carried out while the welding electrode holds the connected terminal 23 and the ends 40a. After that, the arrangement unit 26 is sealed by a grommet and the through-hole 27 is also sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor and a method for joining a lead wire to a brush holder of the motor.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5A, a brush accommodating portion 62 is provided in a resin-made brush holder 61 of a brush device 60, and a brush 63 is provided in the brush accommodating portion 62.
Is accommodated and urged toward the commutator by a spring 64. The brush holder 61 is provided with a power supply plate for supplying power to the brush 63 via the pigtail 65. Generally, the joining quality (strength and environmental resistance) between the end 70a of the external lead wire 70 and the terminal 66 to be joined of the power supply plate is determined.
It is welded with spot welding to ensure. After the spot welding between the terminal 66 to be joined and the end portion 70a, the brush device 60 is fixed to the housing 68 by a screw 67 as shown in FIG.

[0003]

However, since the spot welding is performed in the vicinity of the brush 63 and the brush accommodating portion 62, the spatter scattered at the time of the spot welding causes adhesion failure, and the brush 63 may be attached to a commutator or the like. There is a possibility that inconveniences such as poor contact may occur.

[0004] The brush holder 61 has an external lead wire 7.
After joining, the brush holder 61 is attached to the housing 68.
Therefore, there is a problem that workability when assembling the housing 68 and the brush holder 61 is poor.

The present invention has been made in view of the above-mentioned circumstances, and a first object is to provide a motor which can ensure insulation and good operability of a brush, and can improve the assemblability of a brush holder. Is to do. A second object of the present invention is to provide a method for joining lead wires, which can ensure insulation properties and favorable brush operability, improve the assemblability of a brush holder, and facilitate joining.

[0006]

In order to achieve the first object, according to the first aspect of the present invention, a brush whose tip is in contact with a commutator and a power supply plate for supplying electricity to the brush are provided. In a motor including a provided brush holder and a housing in which the brush holder is housed,
The terminal to be joined, which is a part of the power supply plate, is formed so as to protrude from the brush holder toward the housing, and the arrangement portion where the joint between the terminal to be joined and an external lead wire is arranged is the brush. It is formed outside the holder.

[0007] According to the present invention, since the arrangement portion in which the joint portion is arranged is formed outside the brush holder, when the terminal to be joined and the external lead wire are joined, the brush holder side is shielded. The use of the jig prevents spatter scattered during spot welding from adhering to a brush or the like. Further, occurrence of poor insulation and poor contact of the brush with the commutator or the like is prevented. Therefore, good insulation and good operability of the brush are ensured. In addition, since the arrangement portion is formed outside the brush holder, the terminal to be joined and the lead wire can be joined after the brush holder is housed in the housing, and a long external lead wire is joined as in the related art. There is no need to accommodate the brush holder in the housing in the folded state, and the assemblability of the brush holder is improved.

According to a second aspect of the present invention, in the first aspect of the present invention, a wall is formed between the brush holder and the arrangement portion. According to the present invention, since the wall is formed, spatter scattered during spot welding is prevented from adhering to the brush and the like, and the occurrence of poor insulation and poor contact of the brush with the commutator and the like is prevented. You. Therefore, good insulation and good operability of the brush are ensured.

According to a third aspect of the present invention, in the first or second aspect, the arrangement portion is sealed with a grommet. According to the present invention, it is possible to prevent the spatter adhered to the arrangement portion during spot welding from being released to the outside.

[0010] According to a fourth aspect of the present invention, in the first aspect of the present invention, an insertion portion through which a welding electrode can be inserted is formed in the housing. It is sealed with the grommet. According to the present invention, since the insertion portion is formed, spot welding is facilitated, and after welding, the grommet is used for sealing, so that intrusion of water or the like from the insertion portion is prevented, and waterproofness is improved. Secured.

In order to achieve the second object, in the invention according to claim 5, a brush whose tip is in contact with a commutator, and a brush holder provided with a power supply plate for supplying electricity to the brush are provided. In a method of joining a lead wire to the brush holder of a motor having a housing in which the brush holder is housed, a terminal to be joined, which is a part of the power supply plate, projects from the brush holder toward the housing. And an arrangement portion in which the joint between the terminal to be joined and the external lead wire is arranged is provided on the housing outside the brush holder, and spot welding is performed between the arrangement portion and the brush holder. When at least one of the wall and the shielding jig for preventing the spatter from being scattered toward the brush holder is disposed, the terminal to be joined and the external lead wire are spotted. Joined by welding.

According to the present invention, since the spot welding is performed outside the brush holder, the joining of the external lead wires becomes easy. In addition, the use of at least one of the wall and the shielding jig prevents spatter scattered during spot welding from adhering to a brush or the like, and causes poor insulation and poor contact of the brush with a commutator or the like. Is prevented. Further, the spot welding is performed after the brush holder is housed in the housing, so that the assemblability of the brush holder is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1A is a schematic plan view showing a state in which a lead wire is joined to the brush device,
(B) is a schematic cross-sectional view taken along line BB of (a).
FIG. 2A is a schematic plan view showing a spot welding state,
(B) is a partial enlarged view of (a). FIG. 3A shows FIG.
(A) is a schematic cross-sectional view taken along line AA, (b) is (a).
FIG.

As shown in FIG. 1B, the motor 11
Rotating shaft 12, commutator 13, armature 14
, A housing 15 and a brush device 16. The commutator 13 and the armature 1 are provided on the rotating shaft 12.
4 and are rotatably supported via bearings 17. A brush device 16 is disposed at a position adjacent to the commutator 13.

[0015] As shown in FIG.
Is provided with a bottomed cylindrical resin-made brush holder 18, a substantially quadrangular prism-shaped brush 19, and a brush accommodating portion 20. The brush holder 18 has four brush accommodating portions 20 for accommodating the brushes 19 at regular intervals. The brush 19 is configured to be urged toward the commutator 13 by a spring 21.
2 is configured to be supplied with power. The brush holder 18 is provided with a power supply plate that distributes the positive and negative poles to each brush 19 by insert molding, and the joined terminals 23 of the power supply plate are formed in a substantially square shape so as to protrude from the brush holder 18. A pair is formed. On the brush holder 18 side near the base end of the terminal 23 to be joined, a prevention wall 2 as a wall is provided.
4 is formed to extend toward the armature 14 as shown in FIG. Also, at two predetermined places where the pigtails 22 of the brush holder 18 are not arranged,
Holes 25a are formed one by one.

A recess 15a for accommodating the brush device 16 is formed in the housing 15, and the diameter of the recess 15a is
The flange portion 15b is formed so as to be equal to the outer diameter of the brush device 16 and to extend radially outward from the outer peripheral edge of the concave portion 15a. At the position corresponding to the terminal 23 to be joined of the flange portion 15b, the arrangement recess 1 which is shorter than the prevention wall 24 in the width direction and has the prevention wall 24 side, the external lead wire 40 side, and the armature 14 side opened.
5c is formed. When the brush device 16 is accommodated in the concave portion 15a, the arrangement concave portion 15c and the prevention wall 24 form a box-shaped arrangement portion 26 in which the armature 14 side and the external lead wire 40 side are open. I have. The terminal to be joined 23 and the external lead wire 40 are arranged in the arrangement portion 26, and the prevention wall 24 has a function of preventing spatter from scattering toward the brush holder during spot welding. As shown in FIGS. 2 and 3, welding electrodes 51 a and 51 are provided at positions corresponding to the pair of connected terminals 23 of the arrangement portion 26.
Through holes 27 are formed as insertion portions through which b can be inserted. The hole 25a is provided at the center of the prevention wall 24, and as shown in FIG. 1B, a screw hole 25b communicating with the hole 25a is formed in the housing 15, and the screw hole 25b penetrates the hole 25a. The brush device 16 is formed to be fixed to the housing 15 by screwing the screw 28.

The external lead wire 40 is composed of two lead wires, a positive pole and a negative pole, and has an end 40a and a terminal 2 to be joined.
3 are joined by spot welding to form a joined portion, and after joining, the arrangement portion 26 is configured to be sealed with a grommet.

Next, the motor 11 constructed as described above is used.
The operation of will be described. The brush device 16 includes the brush 1
9 and a spring 21 are housed in the brush housing 20,
The brush accommodating portion 20 is accommodated in the recess 15 a of the housing 15 in a state of being mounted on the brush holder 18. At this time, as shown in FIGS.
6 is arranged so that the hole 25a and the screw hole 25b communicate with each other. Then, the brush device 16 and the housing 15 are fixed by the screw 28, and the arrangement recess 26 is formed by the arrangement recess 15 c and the prevention wall 24.

Next, as shown in FIG. 2 and FIG.
4 is a jig for preventing intrusion of spatter as a jig for shielding on the upper part of 4
0 is placed, and the brush holder 18 side is shielded. Then, an external lead wire 40 is prepared, and
In 6, the terminal 23 to be joined and the end 40a are arranged so as to overlap. Then, the welding electrode 51a is inserted into the through hole 27 and arranged so as to contact the surface of the terminal 23 to be connected opposite to the armature 14, and the welding electrode 51b is connected to the end 40a.
The welding electrodes 51 a and 51 b are arranged so as to contact the surface of the armature 14 side of the armature 14.
In this state, the overlapped portion a is sandwiched. The electric current and the pressing force are concentrated on the overlapped portion, and are locally heated and simultaneously pressurized and spot-welded (resistance welding), so that the overlapped portion becomes a joint. After the spot welding of the terminal 23 to be joined and the end portion 40a, the arrangement portion 26 is formed.
Is sealed by the grommet, and at the same time, the through hole 27 is also sealed, resulting in the state of FIGS. 1 (a) and 1 (b). FIG.
7A omits hatching of the grommets of the through holes 27 in order to facilitate understanding of the relationship between the through holes 27 and the joints.

This embodiment has the following effects. (1) Since the arrangement portion 26 is formed outside the brush holder 18, the terminal 23 to be joined and the end portion 40a can be joined after the brush device 16 is housed in the housing 15. That is, unlike the related art, it is not necessary to house the brush device 16 in the housing 15 in a state where the long external lead wire 40 is joined to the terminal 23 to be joined, and the assemblability of the brush device 16 can be improved.

(2) The brush holder 18 side is the prevention wall 24
The spatter that is scattered at the time of spot welding by being shielded by the
The brush 19 can be prevented from adhering to, for example, the insulation failure and the contact failure of the brush 19 with the commutator 13 or the like. Therefore, good insulation and good operability of the brush 19 can be secured.

(3) After the terminal 23 to be joined and the end portion 40a are joined, the arrangement portion 26 is sealed with a grommet, so that spatter adhered to the arrangement portion 26 during spot welding is released to the outside. Can be prevented.

(4) Since the through hole 27 for inserting the welding electrode 51a is formed in the arrangement recess 15c, spot welding can be easily performed after the brush device 16 is fixed to the housing 15. The assemblability of the brush device 16 can be improved.

(5) In the step of joining the external lead wires 40, since the joining can be performed after the brush device 16 is attached to the housing 15, the manufacturing process of the motor 11 is simplified, and the productivity can be improved. Therefore, the manufacturing cost of the motor 11 can be reduced.

(6) Since the through hole 27 is sealed with the grommet, it is possible to prevent water or the like from entering the joint between the terminal 23 to be joined and the end 40a. The embodiment is not limited to the above, and may be changed as follows, for example.

As shown in FIG. 4 (a), the arrangement may be such that the arrangement portion 26 is provided outside the brush holder 18 without providing the prevention wall 24. In this case, for example, V is placed on the brush holder 18 so that the brush holder 18 is shielded.
The open side of the J-shaped spatter intrusion prevention jig 50 is arranged facing the external lead wire 40 side, and spot welding is performed. That is, even if the prevention wall 24 is not provided, the arrangement portion 26 is
8, the use of the spatter intrusion prevention jig 50 can prevent spatter scattered during spot welding from adhering to the brush 19 and the like, and can prevent insulation failure and the commutator 13 of the brush 19 from being spattered. , Etc., can be prevented from occurring. Therefore, good insulation and good operability of the brush 19 can be secured.

4B, as shown in FIG. 4B, the prevention wall 24 extends toward the armature 14 near the side surface of the brush accommodating portion 20 on the side of the external lead wire 40 so as to enter the inside of the brush holder 18. It may be formed to extend.
In this case, the prevention wall 24 can be formed irrespective of the length of the screw 28, and the height of the prevention wall 24 can be increased to such a state that the jig 50 for preventing spatter intrusion is not required. That is, spatters scattered during spot welding can be prevented from adhering to the brush 19 and the like only by the prevention wall 24, and the occurrence of poor insulation and poor contact of the brush 19 with the commutator 13 and the like can be reduced. Therefore, the insulating property and the brush 19
Good operability can be secured.

As shown in FIG. 4C, the flange 1
5b, on the side of the external lead wire 40, an arrangement recess 15c in which the anti-armature 14 side and the external lead wire 40 side are open is formed, and at a position corresponding to the prevention wall 24 of the arrangement recess 15c, slightly from the prevention wall 24. The configuration in which the small insertion holes 30 are provided may be changed. In this case, when the brush device 16 is housed in the housing 15, the terminal 23 to be joined is inserted through the insertion hole 30 so that the brush device 16 is inclined, and the screw device is housed so that the brush device 16 is fitted into the recess 15 a. 2
Fixed at 8. That is, the arrangement concave portion 15c is in a state where the brush holder 18 side is shielded by the prevention wall 24, and only the through hole 27 is open on the armature 14 side of the arrangement concave portion 15c. Therefore, even without using the spatter intrusion prevention jig 50, spatters scattered during spot welding can be prevented from adhering to the brush 19 and the like, and insulation failure and contact failure of the brush 19 to the commutator 13 and the like can be prevented. Generation can be reduced, and good insulation and good operability of the brush 19 can be secured.

The structure for inserting the welding electrodes 51a and 51b is not limited to the through hole 27, but may be used for the welding electrodes 51a and 51b.
A configuration may be adopted in which a notch as an insertion portion is provided in the disposition portion 26 so that 1b can be brought into contact with the terminal 23 to be joined and the end portion 40a. With such a configuration, the same effect as in the above embodiment can be obtained.

The present invention is not limited to the configuration in which two through holes 27 are formed.
You may change to the structure which forms one long hole long in the width direction. With such a configuration, the same effect as in the above embodiment can be obtained.

[0031]

As described in detail above, according to the first to fourth aspects of the present invention, it is possible to ensure insulation and good operability of the brush, and to improve the assemblability of the brush holder. . According to the invention as set forth in claim 5, good insulation and good operability of the brush can be secured, the assemblability of the brush holder can be improved, and joining can be facilitated.

[Brief description of the drawings]

FIG. 1A is a schematic plan view showing a state in which a lead wire is joined to a brush device, and FIG. 1B is a schematic cross-sectional view taken along a line BB in FIG.

FIG. 2A is a schematic plan view showing a spot welding state;
(B) is a partial enlarged view of (a).

3A is a schematic cross-sectional view taken along line AA in FIG. 2A, and FIG. 3B is a partially enlarged view of FIG.

4A is a schematic plan view showing another example, FIG. 4B is a schematic plan view, and FIG. 4C is a schematic cross-sectional view.

5A is a schematic plan view showing a conventional technique, and FIG. 5B is a schematic plan view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Motor, 13 ... Commutator, 15 ... Housing, 18 ... Brush holder, 19 ... Brush, 23 ... Joined terminal, 24 ... Prevention wall as a wall, 26 ... Arrangement part, 27 ...
Through-hole as insertion portion, 40 ... external lead wire, 40a ...
Ends, 50: a spatter intrusion prevention jig as a shielding jig, 51a, 51b: welding electrodes.

Continued on the front page F term (reference) 5H605 BB05 CC02 CC06 CC07 CC10 DD16 DD32 EA27 EC02 EC04 EC07 GG02 5H613 AA01 AA02 BB32 GA17 GB02 KK07 PP02

Claims (5)

[Claims] 1. A motor comprising: a brush having a tip abutting on a commutator; a brush holder provided with a power supply plate for supplying electricity to the brush; and a housing accommodating the brush holder. A terminal to be joined, which is a part of a plate, is formed so as to protrude from the brush holder toward the housing, and an arrangement portion in which a joint between the terminal to be joined and an external lead wire is arranged is a part of the brush holder. A motor formed outside. 2. The motor according to claim 1, wherein a wall is formed between the brush holder and the arrangement portion. 3. The motor according to claim 1, wherein the arrangement portion is sealed with a grommet. 4. The housing according to claim 1, wherein an insertion portion through which a welding electrode can be inserted is formed in the housing, and the insertion portion is sealed with the grommet. motor. 5. A brush holder for a motor, comprising: a brush having a leading end contacting a commutator; a brush holder provided with a power supply plate for supplying electricity to the brush; and a housing accommodating the brush holder. In the method of joining a lead wire to the terminal, a terminal to be joined, which is a part of the power supply plate, is formed so as to protrude from the brush holder toward the housing, and a joint between the terminal to be joined and an external lead wire is formed. A wall and a shielding jig provided with an arrangement portion to be arranged in the housing outside the brush holder and for preventing spatter at the time of spot welding from scattering to the brush holder side between the arrangement portion and the brush holder. Wherein the terminal to be joined and the external lead wire are joined by spot welding in a state where at least one of the terminals is arranged.