JPH038070Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a brush holding device for a DC machine, etc., and particularly relates to improvements in its insulation structure and wiring structure. related to things.

[Conventional technology]

Conventionally, as a brush holding device used for a DC motor, a brush holder is caulked to a stay made of an insulating substrate, and this stay is fixed to a bracket by sandwiching insulating paper between the two, and further,
Some brush holders are configured so that the lead wire is routed outside the stay and connected to the outer diameter side end surface of the brush holder.

[The problem that the idea attempts to solve]

Such a brush holding device has the following problems.

(1) Insulating paper is sandwiched between the stay and the bracket in order to avoid a short circuit between the bracket and the caulking claw of the brush holder against the stay, which reduces productivity by increasing the number of parts and man-hours. In addition to this, the insulating paper reduces heat resistance and becomes a source of dust, which adversely affects brushes, commutators, etc.

(2) Since the lead wires that are routed tend to move loosely, there is a risk that the lead wires may interfere with the armature coil.

(3) Since the lead wire is wired to the outer end of the brush holder, the lead wire will interfere with the hooking claw of the pigtail, making it difficult to remove the pigtail when assembling it to the motor body. It becomes difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a brush holding device that solves the above problems, eliminates the need for insulating paper, and prevents lead wires from interfering with each other.

[Means to solve the problem]

The brush holding device according to the present invention includes a bracket 1
a stay 13 which is formed into a plate shape using an insulating material and is superimposed on and fixed to the bracket 1; and at least a pair of stays 13 each disposed on the stay 13 and having caulking claws 23 attached thereto. In the brush holding device equipped with a brush holder 19, a recess 4 is concentrically recessed in the bracket 1, and a plurality of convex portions 7 are provided on the bottom wall 4a of the recess 4, and are arranged in parallel with each other. arranged so as to be spaced apart in the circumferential direction, in a direction opposite to the depression direction of the recess 4, and
The stays 13 are raised from the bottom wall 4a of the recess so as to be larger than the thickness of the caulking claws 23 of the brush holder 19, and furthermore, a recess 9 is provided in the bottom wall 4a of the recess 4 so that the brush holder 19 has a recess 9. The same number of holders 19 are arranged so as to face each brush holder 19, the same direction as the depression direction of the recess 4, and the size thereof is larger than the range of the caulking pawl 23 of each brush holder 19. At least one of the brush holders 19 has a lead wire holding claw 26 parallel to the longitudinal direction of the brush holder 19 and protruding outward in the radial direction of the recess 4. At least one of the lead wires wired to each of the brush holders 19 is held down by the lead wire holding claws 26 in a space formed by the bottom wall 4a, side wall 4b, and stay 13 in the recess 4. It is characterized by

[Effect]

According to the above-described means, the brush holder stay 1
3 is lifted from the bracket 1 by each convex portion 7, so that the caulking pawl 23 of the brush holder 19 caulked to the brush holder stay 13 does not come into contact with the bracket 1. Further, since the recess 9 is recessed in the bracket 1 so as to escape the caulking pawl 23, the distance between the caulking pawl 23 and the bracket 1 can be maintained even more reliably. Therefore,
The insulating paper between the bracket 1 and the brush holder stay 13 can be omitted.

On the other hand, the lead wire is held down in the recess 4 by the lead wire holding pawl 23 protruding from the brush holder, so that the lead wire is reliably prevented from moving.

〔Example〕

FIG. 1 is a perspective view showing a brush holding device which is an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is an enlarged cross-sectional view taken along the - line in FIG.

In this embodiment, the brush holding device includes a bracket, a stay fixed to the bracket, and a pair of brush holders each crimped to the stay.

The bracket 1 is formed into a substantially circular dish shape by pressing a thin iron plate or the like, and is assembled to a yoke in a motor body (not shown) so as to close the opening end surface of the bracket 1. A low side wall 2 is bent and erected in an annular shape at the same height on the outer peripheral edge of the bracket 1, and a positioning portion 3 is carved in a part of the side wall 2 to determine the position with respect to the yoke. There is. A substantially circular recess 4 having a relatively large inner diameter is concentrically recessed in the bracket 1, and a recess 5 having a small inner diameter is recessed concentrically and in the same direction in the recess 4. ing. small recess 5
A thick-walled, approximately cylindrical bearing metal 6 is fitted into the rotor, and this metal 6 is designed to rotatably support the end of the rotor shaft (not shown) on the commutator side. It is configured.

On the bottom wall 4a of the recess 4 of the bracket 1, a pair of protrusions 7 are arranged at two positions approximately 180 degrees apart in the circumferential direction and protrude in a substantially circular shape. Rivet insertion holes 8 are provided concentrically. The protrusion 7 is formed by elevating a part of the bottom wall 4a in the direction opposite to the depression direction of the recess 4, and its height is smaller than the thickness of the caulking claw of the brush holder, which will be described later. is also set to be large.

Further, in the bottom wall 4a of the recess 4, a pair of recesses 9 are disposed at two positions approximately 180 degrees apart in the circumferential direction, corresponding to each of the protrusions 7, and are sunk into a substantially rectangular shape. It is set up. The recess 9 is formed by recessing a part of the bottom wall 4a in the same direction as the recess 4, and its size is set so that a clinching claw of a brush holder, which will be described later, can escape therefrom.

Further, a small hole 10 is provided in the bottom wall 4a of the recess 4 at a position approximately equidistant from both the recesses 9, 9, and a grommet 11 made of a rubber bush or the like is provided in the small hole 10. It is fitted. A pair of lead wires 12a and 12b are attached to the grommet 11.
is inserted and pulled in for an appropriate length.

On the other hand, the stay 13 is formed into a substrate shape using an insulating material such as Bakelite. A ring-shaped portion 14 is formed in the center of the stay 13, and the inner diameter of the ring-shaped portion 14 is set to allow a commutator (not shown) of the rotor to be inserted therethrough and rotated.

The stay 13 has a pair of fixing parts 15 for fixing the stay to the bracket 1, which are arranged at positions 180 degrees apart from each other in the circumferential direction on the outer periphery of the ring-shaped part 14, forming a substantially triangular shape that tapers outward. Rivet insertion holes 16 are provided near the tops of both fixed portions 15 and are arranged in a straight line substantially orthogonal to the center of the ring-shaped portion 14 . The fixing portion 15 and the insertion hole 16 are arranged so as to face the protrusion 7 and the insertion hole 8 of the bracket 1, respectively.

On the stay 13, a pair of mounting parts 17 for mounting brush holders are arranged at positions approximately 180 degrees apart in the circumferential direction on the outer periphery of the ring-shaped part 14, and protrude in a substantially rectangular shape. A pair of elongated holes 18 into which the crimping claws of the brush holder can be crimped are provided in the mounting portion 17 and are arranged parallel to each other with the longitudinal direction facing the radial direction. These elongated holes 18 are arranged so as to face the recess 9 of the bracket 1.

The brush holder 19 is made of a conductive thin plate such as brass, and is bent and formed by press working, and the brush holder 19 has a housing part 20 that is open at the bottom and one end when placed horizontally. It is formed into a substantially hollow rectangular parallelepiped shape. Accommodation part 2
The pair of side walls 21a, 21b of 0 have a collar portion 22a,
22b is bent outward at a substantially right angle, and a pair of caulking pawls 23 are bent downward at a substantially right angle and formed at substantially the center of both the flange portions 22a, 22b.

A long hole 24 for pigtail insertion is formed in one side wall 21a of the housing part 20, aligned in the longitudinal direction so that one end is open at the open end surface of the housing part, and a collar part 22a adjacent to this side wall 21a is formed. A pigtail hook 25 is bent upward at a substantially right angle and stands upright. A lead wire holding claw 26 is formed approximately parallel to the longitudinal direction of the accommodating portion 20 at a position substantially adjacent to the hooking claw 25 of the collar portion 22a. is set to protrude outward from the extended surface of the closing wall of the housing portion 20.

A lead wire connecting piece 27 is bent upward at a substantially right angle and stands upright on the other flange 22b so as to substantially oppose the pigtail hook 25.

The brush holder 19 configured in this manner is arranged on the pair of mounting portions 17, 17 of the stay 13 according to the above configuration such that the open end surface of the housing portion 20 faces the center of the ring-shaped portion 14 of the stay 13. The caulking claws 23 are inserted into the long holes 18 of the stay 13 and then bent and caulked to be fixed to the mounting portion 17, respectively.

A brush 28 is placed in the accommodation portion 20 of the brush holder 19.
and a compression spring 29 are housed, and the brush 28
is constantly biased by a compression spring 29 so as to be pushed out from the housing portion 20 . A pigtail 30 (shown in broken lines for convenience) that is planted and connected to the brush 28 is slidably inserted through a long hole 24 formed in the side wall 21a of the housing portion 20. The other end of the pigtail 30 is soldered to the closed end surface of the housing section 20.

In this state, the intermediate portion of the pigtail 30 is hooked on the hook 25 of the brush holder 19, and the brush 28 is thereby pushed out of the accommodation portion 20 against the biasing force of the compression spring 29. has become blocked.

The stay 13 on which the pair of brush holders 19 are mounted in this way is attached to the bracket 1 according to the above structure.
The ring-shaped portion 14 is arranged so as to be concentric with the bearing metal 6 of the bracket 1, and the mounting portion 17 is arranged to face the recess 9 of the bracket 1. After the rivets 31 are inserted into the insertion holes 16 and 8, they are caulked and fixed.

In this state, the fixed portion 15 of the stay 13 comes into contact with the convex portion 7 protruding from the bottom wall 4a of the recess 4 in the bracket 1 and is caulked by the rivet 31, so that the stay 13 is attached to the recess in the bracket 1. 4 is in a floating state from the bottom wall 4a. Therefore, the caulking pawl 23 fixing the brush holder 19 to the stay 13 is separated from the bottom wall 4a of the bracket 1 to ensure an insulating gap. Moreover, since the recess 9 is recessed in the position where the caulking pawl 23 faces the bottom wall 4a, an even larger insulating gap between the caulking pawl 23 and the bracket 1 is ensured.

Each lead wire 12 is attached to each lead wire connecting piece 27, 27 in both brush holders 19, 19 fixed to the bracket 1 via the stay 13 in this way.
a and 12b are connected to each other. here,
One lead wire 12a is attached to one brush holder 19.
The lead wire connection piece 27 is routed behind the closed end face of the accommodating portion 20 . This lead wire 12a is connected to the brush holder 19.
The lead wire holding claw 26 holds the lead wire in a space defined by the bottom wall 4a, side wall 4b, and stay 13 in the recess 4 of the bracket 1.

By the way, the lead wire 12a is connected to the brush holder 19.
If the lead wire 12a is routed behind the closed end surface of the accommodating portion 20 and wired to the lead wire connection piece 27, the lead wire 12a will interfere with the pigtail 30. It becomes difficult to attach and detach.

That is, in assembling this brush holding device to the main body of the motor, it is necessary to remove the pigtail 30 from the hook 25 so that the brush 28 is constantly pressed against the commutator by the compression spring 29. Since the hooking and unhooking operation must be performed through a narrow gap when the bracket 1 is placed over the yoke, the lead wire 12a must be connected to the pigtail hook 25.
If the lead wire 12a is routed around the outside of the pigtail, the pigtail removal operation will be obstructed by the lead wire 12a.
Work becomes difficult.

However, due to the lead wire holding claw 26 protruding from the brush holder 19, the pigtail hooking claw 25
If the lead wire 12a that is routed outside is held down, interference with the lead wire 12a can be avoided, so that the pigtail 30 can be easily hooked and unhooked from the hooking claw 25. .

Furthermore, since the lead wire 12a bypasses the brush holder 19, it is likely to move loosely due to the vibrations of the motor, but if it is held down by the presser claw 26, it will be prevented from moving loosely.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, the number of protrusions for lifting the stay from the bracket is not limited to one pair, but three or more may be provided, and the bracket is not limited to being formed by raising a part of the bracket, but may be formed by being raised.

The number of recesses for escaping the caulking claws of the brush holder relative to the stay is not limited to one pair, and an appropriate number of recesses can be provided corresponding to the brush holders.

[Effect of idea]

By lifting the stay from the bracket using the protruding part on the bracket, an insulating gap can be interposed between the bracket and the caulking claw of the brush holder relative to the stay, thereby improving the insulation between the brush holder and the bracket. can be secured.

By omitting the insulating paper between the bracket and the stay, the number of parts and work hours can be reduced, increasing productivity, improving heat resistance, and eliminating the source of dust generation. Therefore, the performance of the motor can be improved.

By embedding the recess in the bracket, the insulation gap interposed between the caulking claw of the brush holder and the bracket can be further enlarged, so that the insulation between the brush holder and the bracket can be maintained even more reliably. I can do it.

In particular, if the stay is suspended by a pair of protrusions protruding from the bracket, there is a risk that the stay will swing due to the impact and the holder's caulking claw will come into contact with the bracket. By sufficiently avoiding the claws, this danger will be eliminated.

Interference with the lead wire can be avoided by protruding a lead wire holding claw on the brush holder and configuring the holding claw to hold down the lead wire that is routed outside the pigtail hook. Therefore, the pigtail can be easily attached and detached from the hooking claw, and work efficiency can be improved.

Further, by holding the lead wires with the holding claws, it is possible to prevent the lead wires from floating, thereby avoiding the risk of the lead wires interfering with the armature or the like.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a brush holding device which is an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is an enlarged cross-sectional view taken along the - line in FIG. DESCRIPTION OF SYMBOLS 1... Bracket, 2... Side wall, 3... Positioning part, 4... Recess, 4a... Bottom wall, 5... Recess,
6... Bearing metal, 7... Protrusion, 8... Rivet insertion hole, 9... Recess, 10... Small hole, 11... Grommet, 12a, 12b... Lead wire, 13...
...Stay, 14...Ring shaped part, 15...Fixing part, 16...Rivet insertion hole, 17...Mounting part,
18...Long hole, 19...Brush holder, 20...
Accommodating portion, 21a, 21b...Side wall, 22a, 22
b...Flame portion, 23...Caulking claw, 24...Elongated hole for pigtail insertion, 25...Pigtail hooking claw, 26...Lead wire holding claw, 27...Lead wire connection piece, 28... Brush, 29... compression spring, 30... pigtail, 31... rivet.

Claims (1)

[Claims for Utility Model Registration] A bracket 1, a stay 13 formed into a plate shape using an insulating material, and fixed to the bracket 1 by overlapping it, and this stay 13.
A brush holding device comprising at least a pair of brush holders 19, each of which is disposed on the other hand and has a caulking claw 23 attached thereto, wherein a recess 4 is concentrically recessed in the bracket 1; A plurality of protrusions 7 are arranged on the bottom wall 4a of the recess 4 so as to be spaced apart from each other in the circumferential direction, and are arranged in a direction opposite to the depression direction of the recess 4, and
Each of the stays 13 is raised from the bottom wall 4a of the recess 4 so as to be larger than the thickness of the caulking claw 23 of the brush holder 19. Furthermore, the bottom wall 4a of the recess 4 has a recess 9. The same number of brush holders 19 are arranged so as to face each brush holder 19, and the size is larger than the range of the caulking pawl 23 of each brush holder 19. At least one of the brush holders 19 has a lead wire holding claw 26 parallel to the longitudinal direction of the brush holder 19 and facing outward in the radial direction of the recess 4. At least one of the lead wires protruding from the brush holder 19 and wired to the brush holder 19 is held down by the lead wire holding claw 26 into the space formed by the bottom wall 4a, side wall 4b, and stay 13 in the recess 4. A brush holding device characterized by: