JP2002300752A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further restrict movement of lead wires from brushes. SOLUTION: Movement of the lead wires 11a can be further restricted, since the movement of each lead wire 11a can be restricted by a recessed slot 17 in a direction X orthogonal to the fixing direction Y of the lead wire 11a by a slit 14. Therefore, when the lead wires 11a are solder-connected with external lead wires, workability of the connection work is further improved since the movement of the lead wires 11a is restricted, while the lead wires 11a are prevented from unnecessarily sagging since the lead wires 11a, even if flexible, are each guided at two positions of the brush holder 12 and a brush cover 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor suitable for use in electric components mounted on a vehicle or the like.

[0002]

2. Description of the Related Art Generally, in an electric motor of this type, as shown in FIG. 6, a lead wire b called a pigtail drawn out of a brush a for supplying power to an armature (not shown) is provided. , A slit d formed in the brush holder c is inserted, and a lead wire b of the brush holder c passes through a brush cover e mounted on an outer peripheral portion of the brush holder c and is soldered to an external lead wire drawn out to the outside. Have been.

In FIG. 6, the slit d of the brush holder c is formed radially inward from the opening at the outer peripheral end of the brush holder c and parallel to each other so that the lead wire b from the brush a is inserted therethrough. Accordingly, the movement of the lead wire b can be restricted in the direction X perpendicular to the length direction, and the wiring length of the lead wire b is also reduced as much as possible.

[0004]

By the way, in the conventional electric motor shown above, the lead b from the brush a is passed through the slit d formed in the brush holder c.
Although the movement of the lead wire b is restricted in one direction X, there is a problem that the lead wire b moves along the length direction of the slit d. Therefore, at present, it is difficult to connect the lead wire b from the brush a to an external lead wire drawn out to the outside.

The present invention has been made in view of the above-mentioned problems of the prior art,
More restrict the movement of the lead wire drawn out of the brush,
It is an object of the present invention to provide an electric motor capable of easily performing a connection operation with an external lead wire.

[0006]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. Claim 1
In the described invention, a brush holder for holding a brush,
A brush cover assembled to the brush holder, wherein the brush holder is provided with a slit through which a lead wire drawn from the brush is inserted, wherein the brush cover is formed in a direction intersecting the slit of the brush holder, Further, an opposing rib having a concave groove for guiding a lead wire drawn out of the brush and inserting the lead wire into the slit is formed.

As described above, the opposing rib formed on the brush cover has a concave groove in a direction intersecting with the length direction of the slit. Therefore, when the lead wire is inserted into the concave groove, The movement that can be allowed on the slit is regulated by the opposing rib. That is, since the recessed groove can fix the lead wire in a direction intersecting with the fixing direction of the lead wire by the slit, unlike the conventional example, the movement of the lead wire is restricted only in one direction by the slit alone. Movement can be further regulated.

Further, in the present invention, the opposing rib has a protrusion protruding inward at a tip on one of the openings. Thereby, it is possible to prevent the lead wire from coming out of the opposing rib.

Further, in the present invention, the brush cover has a U-shape with a front end opened in the mounting direction with respect to the brush holder, and the opposed rib protrudes from an inner peripheral portion of the brush cover at a rear portion in the mounting direction. ing. As a result, when the brush cover is attached to the brush holder,
Leads can be inevitably inserted between the opposing ribs, and assembling workability is improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is an overall view showing an embodiment of an electric motor according to the present invention, FIG. 2 is a front view of a main part showing a state in which a yoke and an armature are removed from the electric motor, and FIG. FIG. 4 is an explanatory view showing a state where the brush cover is assembled to the brush holder, and FIG. 5 is an explanatory view of the brush holder. In FIG. 1, reference numeral 1 denotes a housing. The housing 1 has a bottomed cylindrical yoke 2 having an inner peripheral surface to which a stator 3 made of a permanent magnet is fixed, and a base for covering an open end of the yoke 2. 4.

An armature shaft (rotating shaft) 6 constituting the armature 5 is rotatably supported in the yoke 2 via bearings 7 and 8. Although not shown in detail, the armature 5 has an armature coil wound around an armature core fixed to an armature shaft 6. Of the bearings 7, 8, the bearing 7 is attached to a bearing holding portion 9 formed at the bottom on one end side of the yoke 2, and the bearing 8 is attached to a bearing holding portion 10 formed in the base 4.

On the other hand, a brush 1 for supplying power to the armature 5
1 is held by a brush holder 12. The brush holder 12 is a plate made of a resin having an insulating property, and is attached to the base 4 by bolts 13 as shown in FIG. In this brush holder 12,
As shown in FIG. 3 and FIG.
A lead wire 11a called a pigtail drawn out of the brush 11 is inserted through the slit 14 and drawn out.

When the brush 11 is formed, the lead wire 11a is
One end of the brush holder 12 is integrally connected to the brush by being set in a mold, and the other end is drawn out to the outside through the slit 14 of the brush holder 12 and then connected to an external lead wire (not shown) by soldering or the like. It has become so.

A brush cover 15 is attached to the brush holder 12. The brush cover 15 is shown in FIG.
As shown in FIGS. 2A and 2B, the peripheral portion is made of an insulating synthetic resin or an insulated metal plate so that the inner peripheral wall of the yoke 2 can be in contact with the inner peripheral wall. As shown in FIGS. 12 is mounted on the outer periphery.

That is, as shown in FIG. 5, the brush cover 15 is formed in an O-ring shape in which a part of the periphery is cut off.
As shown in FIG. 3, when the brush cover 15 is assembled to the brush holder 12, the protrusions 15b are pinched and expanded in a U-shape, and when the brush holder 12 is inserted, as shown in FIG. By returning to the original shape by the elastic restoring force, the brush holder 12 comes into contact with the bottom of the main body 15a as shown in FIG. 1 and is mounted on the outer periphery of the brush holder 12 as shown in FIG. ing.

In this embodiment, as shown in FIGS. 2 to 4, the brush cover 15 is provided with an opposing rib 16 for further restricting the movement of the lead wire 11a. As shown in FIG. 5, the opposing rib 16 is
A first rib 16a formed on the inner peripheral wall of the first rib 16a and a second rib 16b extending so as to face the first rib 16a with a space slightly larger than the thickness of the lead wire 11a.
A concave groove 17 is provided between 6a and 16b.

The recessed groove 17 is provided in the brush cover 15 in the mounting direction A of the brush cover 15 shown in FIG.
When the brush cover 15 is assembled to the brush holder 12, the lead wire 11a is guided through the opening 17a. Therefore, the concave groove 17 is disposed in the brush cover 15 in a direction orthogonal to the slit 14 of the brush holder 12 and at a position corresponding to a portion of the lead wire 11a through which the slit 14 is inserted. Note that the concave groove 17 does not necessarily need to be formed so as to extend in a direction orthogonal to the slit 14 of the brush holder 12, but it is sufficient if the concave groove 17 is formed in a direction crossing the slit 14.

The first rib 1 forming the opposing rib 16
6a and the second rib 16b, the tip of the second rib 16b has a protrusion 16 protruding toward the opening 17a side of the concave groove 17.
c is provided, and the lead wire 11
The protrusion 16a can be prevented from falling out of the recessed groove 17 by the projection 16c.

In the electric motor of this embodiment, the lead wire 11a drawn out of the brush 11 is guided through the opposing rib 16 formed on the brush cover 15, and passes through the slit 14 of the brush holder 12.

In this case, the opposing rib 16 is
Has a recessed groove 17 in a direction perpendicular to the length direction of the lead wire, so that when the lead wire 11a is inserted into the recessed groove 17, the movement of the lead wire 11a on the slit 14 is allowed by the opposing rib 16. . That is, as shown in FIG. 4, the concave groove 17 can fix the lead wire 11a in the direction X orthogonal to the fixing direction Y of the lead wire 11a by the slit 14, so that only one slit is used as in the conventional example. Unlike the movement that regulates only the direction, the movement of the lead wire 11a can be further regulated. Therefore, the lead wire 11
When soldering a to an external lead wire, the lead wire 11
a does not move, not only the workability of the connection work can be further improved, but also the flexible lead wire 11a can be guided over two places of the brush holder 12 and the brush cover 15. Lead wire 11
a is not unnecessarily bent.

In addition, since the brush cover 15 which is originally present is used and the opposing rib 16 is formed on the brush cover 15, no special parts are added.

The opposing rib 16 is provided on the brush cover 15.
When assembling to the brush holder 12, since it is formed at the rear of the assembling direction A, as shown in FIG.
When the brush cover 15 is assembled to the brush holder 12, as shown in FIG. 4, the lead wire 11a inevitably enters the concave groove 17 from the opening 17a of the concave groove 17, so that the assembling workability can be improved accordingly. it can.

The first rib 1 forming the opposing rib 16
Of the 6a and the second rib 16b, the protrusion 16c formed at the tip of the second rib 16b can prevent the lead wire 11a that has entered the recessed groove 17 from accidentally falling out.

[0024]

As described above, according to the present invention, when a lead wire is inserted into the concave groove of the opposing rib formed on the brush cover, the concave groove intersects with the fixing direction of the lead wire by the slit. Since the movement of the lead wire is regulated by the direction, unlike the conventional example where the movement of the lead wire is regulated only in one direction by the slit alone, the movement of the lead wire can be more regulated, and the lead wire can be connected to the external lead. In the case of solder connection with a wire, there is an effect that the lead wire does not move and the workability of the connection work can be further improved.

Further, according to the present invention, since the opposing rib has a protrusion protruding inward at one end on the side of the opening, it is possible to prevent the lead wire from falling out of the opposing rib. effective.

Further, according to the present invention, the brush cover has a U-shape with a front end opened in the mounting direction with respect to the brush holder, and the opposing rib projects from the inner peripheral portion at the rear portion in the mounting direction. Therefore, when the brush cover is assembled to the brush holder, the lead can be inevitably inserted between the opposing ribs, and the assembling workability is improved.

[Brief description of the drawings]

FIG. 1 is an overall view showing an embodiment of an electric motor according to the present invention.

FIG. 2 is a front view of a main part showing a state where a yoke and an armature are removed from the electric motor.

FIG. 3 is an explanatory diagram of a case where a brush cover is assembled to a brush holder.

FIG. 4 is an explanatory view showing a state where a brush cover is assembled to a brush holder.

FIG. 5A is a front view showing a brush holder, and FIG.
FIG. 4 is a cross-sectional view taken along line B.

FIG. 6 is an explanatory view showing a main part of a conventional electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 11 ... Brush 11a ... Lead wire drawn out of brush 12 ... Brush holder 14 ... Slit 15 ... Brush cover 16 ... Opposing rib 17 ... Depression groove 17a ... Opening

Claims (3)

[Claims] 1. An electric motor comprising: a brush holder for holding a brush; and a brush cover assembled to the brush holder, wherein the brush holder has a slit through which a lead wire drawn from the brush is inserted. An opposing rib formed in a direction intersecting with a slit of the brush holder and having a concave groove for guiding a lead wire drawn out of the brush and passing through the slit. 2. The electric motor according to claim 1, wherein the opposing rib has a protrusion protruding inward at a tip on one of the openings. 3. The brush cover has a U-shape having a front end opened in a mounting direction with respect to a brush holder.
2. The electric motor according to claim 1, wherein the opposing rib protrudes from a rear portion of the inner peripheral portion in a mounting direction. 3.