JP2001351759A - Brush holder assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush holder assembly enabling sure and easy fixation of a lead wire, easy and sure manufacture and assemblying, and preventing a movement of the lead wire. SOLUTION: A calking part is provided for calking and mutually connecting a pig tail and the lead wire, connected to a brush held by a holder of a holder plate arranged in dynamo-electric machine, a calking terminal fixed to the holder plate is provided, the calking terminal has a fitting part extending integrally from the calking part, and the fitting part of the calking terminal is inserted into and held by a fitting hole of the holder plate. The fitting part has an engaging part for elastically contacting with the fitting hole, and becomes to have a relation of no play and preventing slip-out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder assembly for a rotating electric machine.

[0002]

2. Description of the Related Art A brush holder assembly is used, for example, with a rotating electric machine for an electric power steering device described in Japanese Patent Application Laid-Open No. 8-258730, and is provided around a commutator that rotates with a rotating shaft. The brush is held so as to be pressed against the commutator.

FIG. 10 is a schematic plan view showing an example of a conventional brush holder assembly. In FIG. 10, a brush holder assembly includes an annular holder plate 1 having a central opening for receiving a commutator (not shown), and a brush holder 2 provided on the holder plate 1 on the opposite side in the radial direction. And The brush holder assembly further includes a brush 3 held by the brush holder 2, a pigtail 4 connected to the brush 3, and a lead wire 5 connected to the pigtail 4 to connect the brush 3 to an external circuit. A pigtail 4 extending from the brush 3 is connected to a lead wire 5 by a caulking terminal 6, and the caulking terminal 6 is a cylindrical metal member fixed to an end of the pigtail 4 and the lead wire 5 by caulking. The caulking terminal 6 is press-fitted into a substantially U-shaped groove or notch 8 formed in a rib 7 provided on the holder plate 1 and is fixed there between.

In such a conventional brush holder assembly, the swaged terminal 6 having an unfixed outer diameter at the swaged portion is sandwiched and fixed by the cut 8 of the rib 7 whose width cannot be adjusted. . For this reason, the pinching of the caulking terminal 6 into the holder plate 1 is sometimes unstable and cannot be reliably fixed, and it is necessary to sufficiently check whether or not the terminal is firmly fixed. In addition, the caulking terminal 6 moves due to unstable fixing, and the lead wire 5
Moves, the brush 3 tilts in the brush holder 2,
A change in the contact with a commutator (not shown) may cause deterioration of the operation sound.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to eliminate the above-mentioned problems of the conventional brush holder assembly, and it is possible to securely and easily fix the brush holder assembly to the holder plate, and to manufacture the brush holder assembly. Another object of the present invention is to provide a brush holder assembly that is easy and reliable in assembling, has high quality, and can eliminate deterioration of operation noise due to movement of a lead wire.

[0006]

According to the present invention, means for solving the above-mentioned problems are as follows. (1) A holder plate provided on the rotating electric machine, a brush holder provided on the holder plate, a brush held by the brush holder, a pigtail connected to the brush, and the brush connected to an external circuit. And a swaging portion for connecting the pigtail to the lead wire by swaging, and a swaging terminal fixed to the holder plate, wherein the swaging terminal is connected to the swaging portion. And the holder plate has a fitting hole for receiving and holding the fitting portion of the caulking terminal.

(2) The caulking portion electrically and mechanically connects the pigtail to the lead wire only by caulking.

(3) The fitting portion has an engaging portion that elastically contacts the fitting hole, and the fitting portion has no play with respect to the fitting hole and is prevented from coming off. .

(4) The lead wire is introduced onto the holder plate at a position substantially opposite to the brush with respect to the axis of the rotating electric machine, and the caulking terminal is provided between the introduction position and the brush. ing.

(5) There are two brushes.

(6) The rotating electric machine has an electromagnetic clutch, and a connecting portion between a lead wire for the electromagnetic clutch and a terminal of the electromagnetic clutch through which the holder plate is inserted,
The brush is provided on the holder plate at a position substantially opposite to the brush with respect to the axis of the rotating electric machine on the same side as the brush on the holder plate.

(7) The rotating electric machine is an electric motor for electric power steering.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 5 show one embodiment of the brush holder assembly of the present invention. The brush holder assembly is suitable for use in an electric power steering motor. The brush holder assembly includes an annular holder plate 1 having a central opening 1a coaxial with an axis A of a rotating electric machine (not shown) for receiving a commutator (not shown).
And a brush holder 2 provided on the holder plate 1
And The brush holder assembly further includes a brush 3 held by the brush holder 2, a pigtail 4 connected to the brush 3, and a lead wire 5 connected to the pigtail 4 to connect the brush 3 to an external circuit. The pigtail 4 extending from the brush 3 is connected to the lead wire 5 by the caulking terminal 10 of the present invention.

As shown in FIGS. 1 and 2, the caulking terminal 10 is fixed to the ends of the pigtail 4 and the lead wire 5 by caulking, and electrically and mechanically connects them to each other. A fitting portion 12 is provided, which is integrally bent and extends from the caulking portion 11 and is fixed to the holder plate 1.

As shown in FIGS. 3 and 4, the caulking portion 11 is formed by punching a metal plate material into a predetermined shape and forming a caulking portion 11 and a fitting portion 12. The portion to be formed and formed into the caulking portion 11 is curved so that the cross-sectional shape becomes substantially U-shaped as shown in FIG.

The fitting portion 12 is twisted at the U-shaped bottom portion of the caulking portion 11 and is bent 90 degrees from the original flat state, and extends substantially in the U-shaped depth direction of the caulking portion 11. Is a plate-shaped member. The tip corner 13 of the fitting portion 12 has a beveled corner to facilitate insertion into a fitting hole described later. A substantially U-shaped slit 14 is formed at the center of the fitting portion 12, and a portion surrounded by the slit 14 is slightly raised to form an elastic engaging portion 15.

As shown in FIGS. 1, 3 and 5, the holder plate 1 has a fitting hole 16 for receiving and holding the fitting portion 12 of the caulking terminal 10. In the illustrated example, the fitting hole 16 is a slit provided in the base 17 and is slightly thicker than the fitting portion 12 as shown in FIG. The portion 15 has such a width that the wall of the fitting hole 16 is pressed. Once the engaging portion 15 is inserted into the fitting hole 16, it does not easily fall off due to the action of the elastic engaging portion 15.

A lead wire 5 is introduced from outside into the holder plate 1 at a position substantially opposite to the brush 3 with respect to the axis A of the rotating electric machine.
And a caulking terminal 10 is provided between

When assembling the brush holder assembly, the tip of the pigtail 4 connected to the brush 3 and the lead wire 5 connecting the brush 3 to an external circuit are inserted into the U-shaped groove of the caulking portion 11 shown in FIG. The crimping portion 11 is wound around the pigtail 4 and the lead wire 5 with a crimping tool (not shown) and crimped. Next, the fitting portion 12 of the caulking terminal 10 in which the pigtail 4 and the lead wire 5 are electrically and mechanically connected only by caulking is pressed into the fitting hole 16 of the holder plate 1 as shown in FIG. So that the fitting portion 12
When the fitting portion 12 is to be pulled out from the fitting hole 16, the engaging portion 15 is elastically contacted with the inner wall of the fitting hole 16. It is possible to prevent the inner wall of the fitting hole 16 from being easily pulled out so as not to be caught or bitten.

According to such a brush holder assembly, the assembling work by crimping and press-fitting is extremely simple, the number of steps is small, soldering and welding work are unnecessary, and malfunctions and pressure resistance failures due to generation of foreign matter are less likely to occur. The quality of finished products is improved, the working environment is improved, and the generation of environmentally hazardous substances is reduced. In addition, since the structure is simple, the brush holder assembly can be reduced in size, and the lead wire can be securely fixed, so that deterioration of the operation noise can be suppressed.

Embodiment 2 FIG. The brush holder assembly shown in FIG. 6 is particularly suitable when the rotating electric machine to be applied is equipped with an electromagnetic clutch 18 as shown in FIG. 7, and includes a lead wire 19 for an electromagnetic clutch and a holder plate 20. A connecting portion of the electromagnetic clutch 18 to be inserted with the terminal 21 is provided on the holder plate at a position on the same side as the brush 3 on the holder plate 20 and substantially opposite to the brush with respect to the axis A of the rotary electric machine 22. ing.

Embodiment 3 FIG. Fitting portion 1 of caulking terminal 10
Various deformations are conceivable for the fitting hole 16 of the holder plate 1 and 2. In the example shown in FIG.
4 and 5 is the same as that shown in FIGS. 4 and 5, except that a stopper 26 in the insertion direction and a stopper 27 in the withdrawal direction are provided in the fitting hole 25, and the fitting portions 12 are respectively provided.
Is engaged with the leading end 28 and the engaging portion 15 so that no further movement is possible. If necessary, it can be disengaged and pulled out using a screwdriver-like tool (not shown).

Embodiment 4 The fitting portion 32 shown in FIG. 9 is provided with a bulging portion 33 which bulges on one side and is depressed on the other side, and a concave portion 35 and a convex portion 36 corresponding to the bulging portion 33 are provided in the fitting hole 34. When the fitting portion 32 of the crimping terminal provided with is inserted into the fitting hole 34, the bulging portion 33 matches with the concave portion 35 and the convex portion 36, and a retaining action is obtained.

[0024]

As described above, the effects of the brush holder assembly of the present invention are as follows. (1) A holder plate provided on the rotating electric machine, a brush holder provided on the holder plate, a brush held by the brush holder, a pigtail connected to the brush, and the brush connected to an external circuit. A lead wire to be connected to the lead wire, and a swaging portion for connecting the pigtail to the lead wire, and a swaging terminal fixed to the holder plate, wherein the swaging terminal is connected to the swaging portion. And the holder plate has a fitting hole for receiving and holding the fitting portion of the caulking terminal. Therefore, the assembling work is extremely simple, the number of processes is small, and no soldering or welding work is required. The generation of load substances is reduced. In addition, since the structure is simple, the brush holder assembly can be reduced in size, and the lead wire can be securely fixed, so that deterioration of the operation noise can be suppressed.

(2) Since the swaging portion electrically and mechanically connects the pigtail to the lead wire only by swaging, the assembling operation by swaging and press-fitting is extremely simple and the number of steps is small. Since soldering and welding work are unnecessary, operation failure and pressure resistance failure due to the generation of foreign matter are less likely to occur, and the quality of the finished product is improved, the working environment is improved, and the generation of environmentally hazardous substances is reduced.

(3) The fitting portion includes an engaging portion that elastically contacts the fitting hole, and the fitting portion has no play with the fitting hole and is prevented from coming off. Therefore, it is possible to maintain high reliability without play by simply press-fitting.

(4) The lead wire is introduced onto the holder plate at a position substantially opposite to the brush with respect to the axis of the rotating electric machine, and the caulking terminal is provided between the introduction position and the brush. As a result, the brush holder assembly can be reduced in size, and the lead wire can be securely fixed, so that deterioration of the operation noise can be suppressed.

(5) Since the number of the brushes is two and the structure is simple, the size of the brush holder assembly can be reduced, and the lead wire can be securely fixed, so that deterioration of the operation noise can be suppressed.

(6) The rotating electric machine has an electromagnetic clutch, and a connecting portion between a lead wire for the electromagnetic clutch and a terminal of the electromagnetic clutch through which the holder plate is inserted,
Since the brush is provided on the holder plate at a position substantially opposite to the brush with respect to the axis of the rotating electric machine on the same side as the brush on the holder plate, the structure is simple and the brush holder assembly can be downsized. Becomes possible.

(7) Since the rotating electric machine is an electric motor for electric power steering, operation failure and pressure resistance failure due to the generation of foreign matter are less likely to occur, and safety, which is a part of the quality of the finished product, is particularly enhanced, and the operation noise is reduced. Low is also particularly advantageous.

[Brief description of the drawings]

FIG. 1 is a front view showing a brush holder assembly according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a crimp terminal of the brush holder assembly of the present invention.

FIG. 3 is a perspective view showing an assembling operation of a swaging terminal of the brush holder assembly of the present invention.

FIG. 4 is a perspective view showing a caulking terminal of the brush holder assembly of the present invention.

FIG. 5 is a cross-sectional view illustrating a relationship between a fitting portion and a fitting hole of the brush holder assembly of the present invention.

FIG. 6 is a front view showing a brush holder assembly according to another embodiment of the present invention.

FIG. 7 is a side view of a rotating electric machine to which the brush holder assembly of FIG. 6 can be applied;

FIG. 8 is a schematic cross-sectional view showing another example of the fitting portion of the caulking terminal of the brush holder assembly of the present invention.

FIG. 9 is a schematic sectional view showing another example of a fitting portion of a caulking terminal of the brush holder assembly of the present invention.

FIG. 10 is a plan view of a conventional brush holder assembly.

[Explanation of symbols]

1 holder plate, 2 brush holders, 3 brushes, 4 pigtails, 5 lead wires, 10 caulking terminals, 11 caulking portions, 12 fitting portions, 15 engaging portions, 1
6 fitting hole, 18 electromagnetic clutch, 19 lead wire for electromagnetic clutch, 21 terminal of electromagnetic clutch, A axis of rotating electric machine.

Continuation of the front page F term (reference) 3D033 CA01 5H613 AA01 AA02 BB04 BB15 GA11 GA14 GA17 GB01 GB09 GB13 KK05

Claims (7)

[Claims] 1. A holder plate provided on a rotating electrical machine, a brush holder provided on the holder plate, a brush held by the brush holder, a pigtail connected to the brush, and an external circuit connected to the brush. A lead wire for connecting the pigtail to the lead wire by caulking, and a caulking terminal fixed to the holder plate, wherein the caulking terminal is A brush holder assembly having a fitting portion integrally extending from a caulking portion, wherein the holder plate has a fitting hole for receiving and holding the fitting portion of the caulking terminal. 2. The brush holder assembly according to claim 1, wherein said swaging portion electrically and mechanically connects said pigtail to said lead wire by swaging only. 3. The fitting portion has an engaging portion that elastically contacts the fitting hole, and the fitting portion has no play with respect to the fitting hole and is prevented from coming off. The brush holder assembly according to claim 1 or 2, wherein: 4. The lead wire is introduced on the holder plate at a position substantially opposite to the brush with respect to the axis of the rotating electric machine, and the caulking terminal is provided between the introduction position and the brush. The brush holder assembly according to any one of claims 1 to 3, wherein: 5. The brush holder assembly according to claim 1, wherein said brush comprises two brushes. 6. The rotary electric machine has an electromagnetic clutch, and a connecting portion between a lead wire for the electromagnetic clutch and a terminal of the electromagnetic clutch that passes through the holder plate is on the same side as the brush on the holder plate. The brush holder assembly according to any one of claims 1 to 5, wherein the brush holder assembly is provided on the holder plate at a position substantially opposite to the brush with respect to the axis of the rotating electric machine. 7. The brush holder assembly according to claim 1, wherein said rotating electric machine is an electric motor for electric power steering.