JPH0445421Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a brush holding device for a DC machine, etc., and particularly relates to improvements in the structure and wiring structure of the brush holder. Concerning what works.

[Conventional technology]

Conventionally, as a brush holding device used for a DC motor, a brush is housed in a brush holder formed in a substantially hollow rectangular parallelepiped shape with one end open, and a lead is attached to a connection part provided upright on one side of the brush holder. Some are configured to weld wires.

[The problem that the idea aims to solve]

In such a brush holding device, in order to wire the lead wire along the side wall of the bracket, it is necessary to bend the lead wire welded to the side surface of the brush holder at a substantially right angle in the tangential direction near the welded part. Therefore, if the lead wire is thick and hard, it will be difficult to bend the lead wire, which will not only result in improper wiring work, but also cause lateral strain force to be applied from the lead wire to the brush holder.
There is a problem that the brush holder is deformed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a brush holding device that can solve the above problems, ensure proper wiring of lead wires, and prevent deformation of the brush holder.

[Means to solve the problem]

In the brush holding device according to the present invention, the stay 10 is formed into a plate shape using an insulating material.
A recess 4 of the bracket 1 formed into a substantially dish shape
The brush holder 17 is concentrically arranged and fixed inside the stay 10 via an insulator 34, and at least one pair of brush holders 17 are fixed to each mounting part 14, respectively. The main body 18 and the bottom plate 19 are respectively formed using conductive thin plates.
In addition, the main body 18 has an accommodating portion 20 formed in a substantially hollow rectangular parallelepiped shape with the bottom surface and the radially inner end surface open and the other surfaces closed when the main body 18 is placed horizontally. , a pair of side walls 21a, 21 of the housing section 20
caulking claws 23, 23 that are respectively arranged at positions corresponding to approximately the center of b and project downward; and a pigtail insertion length that is provided along the radial direction on one side wall 21a of the housing portion 20. On the other hand, the bottom plate 19 has a width in the opening direction that is larger than the distance between the pair of side walls 21a and 21b in the main body 18, and a length in the depth direction. The main body 18 includes a closing portion 28 formed in a substantially rectangular shape having a dimension substantially equal to the depth of the housing portion 20, and a protruding portion 29 extending radially outward from the closing portion 28. On each mounting portion 14 of the stay 10, a bottom plate 19 of the brush holder 17 is arranged with its protruding portion 29 facing outward in the radial direction, and a closing portion 28 is in contact with the bottom plate 19. The main body 18 is disposed above with the radial opening of the housing portion 20 facing radially inward, and the pair of side walls 21a, 21b abutting both ends of the top surface of the bottom plate 19, respectively. Then, the caulking claws 23, 23 of the main body 18 penetrate the stay 10 and are caulked on the end surface of the stay 10 on the side of the bracket 1, so that the main body 18 and the bottom plate 19 are both attached to the stay 10.
A brush 31 and a spring 32 are fixed to the housing part 20 of each brush holder 17, and a brush 31 and a spring 32 are fixed to the housing part 20 of each brush holder 17.
One end of the pigtail 33 is connected to the brush 31, and the other end of the pigtail 33 is connected to the protrusion 29 on the bottom plate 19. At the same time, the middle part of the pigtail 33 is slidably inserted into the elongated hole 25 of the housing side wall 21a, and the end face of the protruding part 29 on the bottom plate 19 on the side opposite to the bracket 1 is welded. The brush holding device is characterized in that one end of a lead wire 9 drawn into the bracket 1 is wired from the tangential direction of the bracket 1 and welded.

[Effect]

According to the above-described means, the lead wire 9 is welded to the protrusion 29 of the bottom plate 19 of the brush holder 17 in a substantially perpendicular direction, so that the welding direction and the drawing direction match, so that the lead wire 9 is welded. There is no need to bend it at right angles near the section, making the routing work easier. Since the lead wires are not bent and deformed, the elastic force of the lead wires 9 no longer acts on the brush holder, and the risk of the brush holder 17 being deformed is eliminated.

In addition, the brush holder 17 is attached to the main body 18 with a bottom plate 19.
Since it is constructed by assembling the brush holder, the steel properties of the brush holder can be improved. Therefore, even if a tensile force is applied to the lead wire welded to the bottom plate 19, the brush holder can be prevented from being deformed by the force.

〔Example〕

Fig. 1 is an exploded perspective view showing a brush holding device which is an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a similar - FIG. 3 is an enlarged cross-sectional view taken along the line.

In this embodiment, the brush holding device includes a bracket, a stay fixed to the bracket through insulating paper and felt, and two pairs 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 (not shown) is fitted into the shaft, and this metal is rotatably attached to the end of the rotor shaft (not shown) on the commutator side. It is constructed to support.

At least a pair of rivet insertion holes 6 are provided in the bottom plate 4a of the recess 4 of the bracket 1 and are arranged at two positions approximately 180 degrees apart in the circumferential direction. A small hole 7 is opened at the position. A grommet 8 made of a rubber bush or the like is fitted into the small hole 7, and a pair of lead wires 9 are respectively inserted through the grommet 8 and drawn to an appropriate length.

On the other hand, the stay 10 is formed into a plate shape using an insulating material such as Bakelite. A window hole 11 is formed in the center of the stay 10, and the inner diameter of the window hole 11 is set to allow a rotor commutator (not shown) to be inserted therethrough and rotated.

A pair of fixing parts 12 for fixing the stay to the bracket 1 are arranged on the stay 10 at positions 180 degrees apart from each other in the circumferential direction outside the window hole 11, and are integrated with the fixing parts 12 between the mounting parts described later. Both fixed parts 1
2, each rivet insertion hole 13 is arranged and opened so as to be located on a straight line substantially perpendicular to the center of the window hole 11. These rivet insertion holes 1
3 are arranged so as to be aligned with the rivet insertion holes 6 of the bracket 1 described above.

The stay 10 has two pairs of mounting parts 14 for mounting brush holders, which are arranged in positions approximately 90 degrees apart from each other in the circumferential direction on the outside of the window hole 11 and protrude in a substantially rectangular shape. Each mounting portion 14 has a pair of elongated notches 15 and elongated holes 16 into which the crimping claws of the brush holder can be crimped.
They are arranged so that their longitudinal directions are parallel to each other and are oriented in the radial direction.

The brush holder 17 includes a main body 18 and a bottom plate 19, and the main body 18 and the bottom plate 19 are bent and formed by press working using conductive thin plates such as brass.

A housing portion 20 is formed in the main body 18 of the brush holder in the shape of a substantially hollow rectangular parallelepiped with an open bottom surface and one end surface when the brush holder is placed horizontally. A collar portion 22 is provided on the pair of side walls 21a and 21b of the accommodating portion 20.
a, 22b are bent outward at a substantially right angle, and a pair of caulking claws 23 are bent downward at a substantially right angle and protrude from substantially the center of both the flange portions 22a, 22b. At a position behind the caulking pawl 23 on both flanges 22a and 22b, there is a pawl receiving part 24 for receiving a positioning pawl on the bottom plate 19, which will be described later.
are each cut into a substantially semicircular shape.

A long hole 25 for pigtail insertion is formed in one side wall 21a of the accommodating part 20, aligned in the longitudinal direction so that one end is open at the open end surface of the accommodating part, and a collar part 22a adjacent to this side wall 21a. A pigtail hook 26 is bent upward at a substantially right angle and stands upright.

A 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 26.

The bottom plate 19 includes a closing part 28 and a protruding part 29, and the closing part 28 has a width that is approximately equal to the distance between the caulking claws 23, 23 in the main body 18, and a length that is approximately equal to the depth of the accommodating part 20 in the main body 18. It is formed into a substantially rectangular shape with a width. Obstruction part 28
A pair of positioning pawls 30 are arranged approximately at the center of each side of the main body 18, and are bent upward at a substantially right angle. It is configured to obtain.

The protruding portion 29 of the bottom plate 19 protrudes rearward from the rear end of the closing portion 28 in a substantially rectangular shape, and a wall portion 29a is bent upward at a substantially right angle and stands on the rear end side.

The brush holder 17 is mounted on each mounting portion 14 in the stay 10 as follows. That is, the bottom plate 19 is mounted on the mounting portion 14 so as to abut the closing portion 28 with its protruding portion 29 facing outward in the radial direction of the window hole 11 in the stay 10 . On this bottom plate 19 is a main body 18.
is arranged so that the opening end surface of the housing part 20 faces the center of the window hole 11, and the caulking claw 2
3 is inserted into the notch 15 and elongated hole 16 of the stay 10, and the positioning pawl 30 of the bottom plate 19 is inserted into the pawl receiving portion 24, and then set. The caulking claws 23 protruding downward from the stay 10 are caulked so as to embrace the notch 15 and the elongated hole 16, thereby fixing the main body 18 and the bottom plate 19 of the brush holder 17 to the mounting portion 14 of the stay 10.

The brush 31 is placed in the accommodation portion 20 of the brush holder 17.
and a compression spring 32 are housed, and the brush 31
is constantly biased by a compression spring 32 so as to be pushed out from the housing portion 20 . A pigtail 33 is connected to the brush 31 by planting one end thereof, and the other end of the pigtail 33 is spot-welded in advance to the bottom plate of the protrusion 29 of the bottom plate 19. The pigtail 33 is slidably inserted into an elongated hole 25 formed in the side wall 21a of the accommodating portion 20, so that the pigtail 33 can move relative to the brush holder 17.

In this state, the intermediate portion of the pigtail 33 is hooked onto the hook 26 of the brush holder 17, so that the brush 31 protrudes from the accommodation portion 20 against the biasing force of the compression spring 32. has become blocked.

The stay 10 on which a plurality of brush holders 19 are mounted in this way is mounted on the bracket 1 with an insulating paper 34 and a felt 35, and the window hole 11 is arranged concentrically with the bearing recess 5 in the bracket 1. And, the rivet insertion hole 13 is arranged so as to align with the rivet insertion hole 6 of the bracket 1, the rivet insertion hole 36 of the insulating paper 34 and the felt 35, and the rivet 37 is inserted into each rivet insertion hole 13, 6.36. It is fixed by being caulked after being attached.

In this state, the caulking pawl 23 that fixes the brush holder 17 to the stay 10 is exposed from the bottom surface of the stay 10, but it comes into contact with the insulating paper 34 interposed between the stay 10 and the bracket 1. Therefore, it is insulated from the bottom plate 4a of the bracket 1.

Of the brush holders 17 fixed to the bracket 1 via the stay 10 in this way, two brush holders 17a and 17b located on both sides of the grommet 8 have the following properties: One ends of both lead wires 9 drawn into the bracket 1 are welded to the upper surface of a protrusion 29 on the bottom plate 19 by soldering. Since this lead wire 9 is arranged and welded at a substantially right angle to the protruding portion 29, the direction in which the lead wire 9 is drawn is substantially coincident with the tangential direction of the bracket 1.

By the way, for example, when the lead wire 9 is welded to the wire connecting piece 27 of the brush holder 17a, the welding direction of the lead wire is in the radial direction of the bracket, which is approximately perpendicular to the direction in which the lead wire is routed. It becomes necessary to bend the wire at a substantially right angle near the weld. If the lead wire is thick and hard, it is difficult to bend it at right angles, making routing work difficult. And also,
Even after the lead wire is routed, a lateral strain force is applied to the brush holder by the lead wire due to its elastic force, so there is a risk that the brush holder may be deformed.

However, in this embodiment, the lead wire 9 is welded to the protrusion 29 of the bottom plate 19 of the brush holder 17a (or 17b) in a substantially perpendicular direction, so that the welding direction and the routing direction are matched. The lead wire 9 does not need to be bent at right angles near the welded portion, and the routing work is facilitated. Further, since the lead wire 9 is not bent and deformed, the elastic force of the lead wire no longer acts on the brush holder, and the risk of the brush holder being deformed is eliminated.

Since the brush holder is constructed by assembling the bottom plate 19 to the main body 18, the brush holder can have increased rigidity. Therefore, even if a tensile force is applied to the lead wire welded to the bottom plate 19, the brush holder can be prevented from being deformed by the force.

The protrusions 29 of the pair of brush holders 17a and 17b to which the lead wires 9 are connected,
A pair of transfer wires 38 are connected by welding one end of each by soldering, and the welding direction of the transfer wires 38 to the protrusion 29 also coincides with the tangential direction of the bracket 1.

The transfer wire 38 is routed approximately 180 degrees along the side wall 4b of the recess 4 in the bracket 1, and the brush holder 1 is located at a location where the wire is routed approximately 90 degrees.
By being inserted between the protrusion 29 of the bracket 7b (or 17a) and the bottom wall 4a of the bracket 1, lifting is prevented.

The connecting wire 38, which has been routed approximately 180 degrees, is welded to the brush holder 17c or 17d, which directly faces the brush holder 17a or 17b from which the routing begins, by soldering the other end to the connecting wire connecting piece 27 in the holder. connected. The welding direction of the connecting wire 38 to the connecting piece 27 is in the radial direction of the bracket 1, but since the connecting wire 38 is thinner and more flexible than the lead wire 9, it is easy to bend it at a substantially right angle. Furthermore, no strain force due to elastic force is applied to the brush holder 17c or 17d.

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 bottom plate of the brush holder is
It may be constructed as shown in FIGS. 6 and 7.

A step portion 39 is formed between the closing portion 28 and the protruding portion 29 on the bottom plate 19A shown in FIGS. It is becoming increasingly important to ensure that As a result, the positioning claw 30 can be omitted, so that the force applied from the lead wire 9 to the bottom plate 19A can be prevented from being transmitted to the main body 18.

That is, on the mounting portion 14 of the stay 10, the bottom plate 19A of the brush holder 17 is arranged with its protruding portion 29 facing outward in the radial direction, and the closing portion 28 is in contact with the bottom plate 19A. Main body 18
However, the radial opening of the housing portion 20 is oriented radially inward, and the pair of side walls 21a and 21b are arranged in contact with both ends of the upper surface of the bottom plate 19A, so that the main body 18 can be caulked. The claws 23, 23 penetrate the stay 10 and connect the bracket 1 of the stay 10.
By caulking the side end surfaces, both the main body 18 and the bottom plate 19A are attached to the stay 10.
is fixed.

A pair of notches 40 are formed in the bottom plate 19B shown in FIG.
0 is used instead of the positioning claw 30 to ensure positioning between the main body and the bottom plate.

A pair of elongated holes 41 are formed in the bottom plate 19C shown in FIG. It is designed to ensure positioning with.

The brush holders are not limited to one pair, but one
A set or three or more sets or three or more sets may be provided.

[Effect of idea]

By welding the lead wire to the protruding part of the bottom plate of the brush holder, the welding direction and the routing direction can be matched, so there is no need to bend the lead wire at right angles near the welding part, making routing work easier. In addition, since the elastic force of the lead wire does not act on the brush holder at all, the risk of the brush holder being deformed can be eliminated.

By assembling the bottom plate to the main body to form the brush holder, the rigidity of the brush holder can be increased, so even if a tensile force is applied to the lead wires welded to the bottom plate, the brush holder will not be deformed. can be prevented.

By welding the pigtail to the bottom plate in advance, parallel processing can be performed and spot welding can be easily performed, so that workability can be improved.

[Brief explanation of the drawing]

Figures 1 a, b, c, and d are exploded perspective views showing a brush holding device that is an embodiment of the present invention, Figure 2 is a plan view, and Figure 3 is a sectional view taken along the - line in Figure 2. , FIG. 4 is an enlarged sectional view taken along the - line. FIGS. 5a and 5b are a partially omitted exploded perspective view and a partially sectional view showing a modified example of the bottom plate. FIG. 6 is a partial perspective view showing another modification of the bottom plate. FIG. 7 is a partial perspective view showing another modification of the bottom plate. DESCRIPTION OF SYMBOLS 1... Bracket, 2... Side wall, 3... Positioning part, 4... Recess, 4a... Bottom wall, 5... Recess,
6... Rivet insertion hole, 7... Small hole, 8... Grommet, 9... Lead wire, 10... Stay, 11
...Window hole, 12...Fixed part, 13...Rivet insertion hole, 14...Mounting part, 15...Notch part, 16...
...Long hole, 17...Brush holder, 18...Main body,
19, 19A, 19B, 19C...bottom plate, 20...
...accommodating part, 21a, 21b...side wall, 22a, 2
2b...Flame portion, 23...Clinching claw, 24...Claw receiver, 25...Elongated hole for pigtail insertion, 26...
Pigtail hook, 27... Transfer wire connection piece, 28, 28A... Closing part, 29, 29A...
Projection part, 30... Positioning claw, 31... Brush,
32...Compression spring, 33...Pigtail, 34...
...Insulating paper, 35...Felt, 36...Rivet insertion hole, 37...Rivet, 38...Transfer wire, 3
9...Step part, 40...Notch part, 41...Long hole.

Claims (1)

[Claims for Utility Model Registration] A stay 10 made of an insulating material and formed into a plate shape is concentrically inserted into the recess 4 of the bracket 1 formed into a substantially dish shape through an insulator 34. In the brush holding device in which at least one pair of brush holders 17 are fixed to each mounting portion 14 on the stay 10, each of the brush holders 17 is formed using a conductive thin plate. Main body 18 and bottom plate 19
In addition, the main body 18 has an accommodating portion 20 formed in a substantially hollow rectangular parallelepiped shape with the bottom surface and the radially inner end surface open and the other surfaces closed when the main body 18 is placed horizontally. , a pair of side walls 21a, 21 of the housing section 20
caulking claws 23, 23 that are respectively arranged at positions corresponding to approximately the center of b and project downward; and a pigtail insertion length that is provided along the radial direction on one side wall 21a of the housing portion 20. On the other hand, the bottom plate 19 has a width in the opening direction that is larger than the distance between the pair of side walls 21a and 21b in the main body 18, and a length in the depth direction. The main body 18 includes a closing portion 28 formed in a substantially rectangular shape having a dimension substantially equal to the depth of the housing portion 20, and a protruding portion 29 extending radially outward from the closing portion 28. On each mounting portion 14 of the stay 10, a bottom plate 19 of the brush holder 17 is arranged with its protruding portion 29 facing outward in the radial direction, and a closing portion 28 is in contact with the bottom plate 19. The main body 18 is disposed above with the radial opening of the housing portion 20 facing radially inward, and the pair of side walls 21a, 21b abutting both ends of the top surface of the bottom plate 19, respectively. Then, the caulking claws 23, 23 of the main body 18 penetrate the stay 10 and are caulked on the end surface of the stay 10 on the side of the bracket 1, so that the main body 18 and the bottom plate 19 are both attached to the stay 10.
A brush 31 and a spring 32 are fixed to the housing part 20 of each brush holder 17, and a brush 31 and a spring 32 are fixed to the housing part 20 of each brush holder 17.
One end of the pigtail 33 is connected to the brush 31, and the other end of the pigtail 33 is connected to the protrusion 29 on the bottom plate 19. At the same time, the middle part of the pigtail 33 is slidably inserted into the elongated hole 25 of the housing side wall 21a, and the end face of the protruding part 29 on the bottom plate 19 on the side opposite to the bracket 1 is welded. The brush holding device is characterized in that one end of a lead wire 9 drawn into the bracket 1 is wired from the tangential direction of the bracket 1 and welded.