JP2577765Y2 - Brush holder structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an insulation for holding and fixing a brush, a brush holder for holding the brush, and a terminal plate to which a pigtail wire drawn from the brush is welded and joined in a DC motor (DC motor) having a brush. The present invention relates to a brush holding unit structure including a conductive substrate and the like.

[0002]

2. Description of the Related Art As is well known, a direct current motor (DC motor) generally has a cylindrical yoke having one end opened, a bottom portion attached to the yoke so as to cover an open end of the yoke, a yoke and a bottom surface. And a rotating shaft rotatably supported by the section. On this shaft, a wound armature and a commutator are axially mounted, and on the inner peripheral surface of the yoke, a magnet fixed around the outer periphery of the armature via a magnetic gap is arranged. Have been.

A brush is constantly slid on the outer peripheral surface of the commutator, and the brush is mechanically slid on the commutator and the brush.
The current direction of the armature winding is switched.
The brush is held by a brush holder as a retainer provided on the insulating substrate so as to be able to advance and retreat, and a predetermined pressure is applied to the commutator by an urging means such as a torsion coil spring to obtain a good rectifying action. Pressed at.

By the way, in the above-mentioned motor structure, the electrical connection between the brush and the outside has been made by the following structure. That is, brush holders for positive and negative terminals are provided on one side surface on an insulating substrate made of a synthetic resin material or the like, and the brushes for positive and negative terminals held by these are urged by springs or the like, respectively. Pressed against the commutator side. Pigtail wires, which are lead wires drawn out of the holders from these brushes, are welded to terminal plates for positive and negative terminals which are held and fixed to the substrate by appropriate means. Was to be connected externally via

Here, each of the terminal plates is generally held and fixed to the other side of the substrate, a part of which is extended to one side, and a pigtail wire from the brush is pressed against the extended part. In this state, welding and joining are generally performed by spot welding, ultrasonic welding, or the like.

[0006]

However, in the conventional structure described above, each time the pigtail wire is pressed against the welded portion of the terminal plate and welded, a dedicated jig or attachment for welding and joining is set. However, it is necessary to remove them, the number of welding steps is increased, and the use of dedicated jigs and attachments inevitably raises costs. In such a structure, the flow of the line is interrupted when the pigtail wire is welded to the terminal plate, so that there is a problem that automatic assembly is difficult.

In particular, the terminal plate has a structure in which a portion to be welded is wrapped around one side of the substrate from a hole or the like formed in a part of the insulating substrate for welding and joining with the pigtail wire. However, the structure was complicated, and the assembly of the terminal plate was troublesome, and there were many practical problems.

Further, in the above-mentioned conventional structure, there are restrictions on the location where the pigtail wire is welded to the terminal plate, the length of the pigtail wire becomes longer, and the pigtail wire comes into contact with other locations, resulting in high cost and quality. There is also a problem that the problem arises, and it is desired to take some measures that can eliminate these problems.

In the above-described structure for welding the pigtail wire to the terminal plate, the terminal plate for the positive and negative terminals of the brush carbon powder accompanying the abrasion of the brush due to the mechanical sliding contact with the commutator. There is also a problem that the insulating property is deteriorated due to adhesion to the surface, and it is necessary to consider such a problem.

The present invention has been made in view of such circumstances, and reduces man-hours at the time of welding and joining a pigtail wire drawn out of a brush and a terminal plate held and fixed to an insulating substrate, and a dedicated jig. Structure that eliminates the use of metal and attachments, improves welding quality, prevents deterioration of insulation between the terminal plates for positive and negative terminals due to the attachment of brush carbon powder, and reduces costs and enables automatic assembly. The purpose is to get.

[0011]

In order to respond to such a demand, the brush holding portion structure according to the present invention is provided on one side with a brush holder for holding a brush slidingly contacting the commutator peripheral surface so as to be able to advance and retreat. A terminal board to be welded and connected to the pigtail wire drawn out of the brush is provided with a resin insulating substrate held and fixed on the other side, a through hole is formed in a part of this substrate, and one side of the substrate is formed. A cylindrical portion is integrally formed so as to surround the peripheral portion of the through hole on the side, and slits capable of temporarily fixing a pigtail line are provided at least at two positions facing each other in the cylindrical portion peripheral wall portion, and the pigtail line is formed into a cylindrical shape. It is configured such that it can be welded and joined to a part of the terminal plate via a through hole in the shape.

[0012]

According to the present invention, a pigtail line drawn from a brush in a brush holder provided on one side of a resin-made insulating substrate is connected to a cylindrical portion provided on one side of this substrate. By hooking on the slit for temporary fixing and bringing it into contact with the terminal plate on the other side of the substrate provided facing the through hole in this cylindrical portion, in this state, these are welded and joined by welding means such as spot welding. The welding and joining of the pigtail wire and the terminal plate can be easily performed without the need for special positioning, the use of special jigs and attachments, and the attachment and detachment thereof, and without interrupting the flow of the assembly line.

[0013]

1 to 3 show one embodiment of the structure of a brush holding portion according to the present invention. In these drawings, reference numeral 1 designates a composite unit which is incorporated in a motor or the like whose whole illustration is omitted. An insulating substrate made of resin material,
On the substrate 1, a holding portion of the brush 2 slidably in contact with a peripheral surface of a commutator (commutator) fixed on a rotating shaft of a motor (not shown) is provided integrally or integrally. On the back surface of the substrate 1, terminal plates 3 and 3 (only one is shown) for positive and negative terminals, such as brass plates having positive and negative polarities, are held and fixed by appropriate means. .

Reference numeral 4 denotes a pig tail wire which is a lead wire drawn out of the brush 2, and the pig tail wire 4 is connected to one of the substrates 1 while allowing the brush 2 to move in a brush holder (not shown). The terminal plate 3 is configured to be welded and joined to a welded portion 3a of the terminal plate 3 through a through hole 5 formed in the portion. Here, the welded portion 3a of the terminal plate 3 is formed as a convex portion that rises from the other side surface of the substrate 1, as is apparent from FIG.

The means for holding and fixing the terminal plates 3 and 3 to the substrate 1 includes the substrate 1 or the terminal plates 3 and 3.
It is needless to say that an appropriate method using engagement, caulking, or other locking and holding means between the boss portion provided in the above and the corresponding hole portion can be considered. In short, the substrate 1 may have a structure capable of securely holding and fixing the terminal plates 3 on the other side opposite to the side on which the brush holder or the like is provided.

Reference numeral 10 denotes a cylindrical portion integrally protruding from one side surface of the substrate 1 so as to surround the peripheral portion of the through hole 5. The cylindrical portions 10 (10a, 10b) are At least two opposing positions of the peripheral wall are provided with slits 11 and 12 for temporarily fixing the pigtail wire 4.

In the figure, reference numeral 14 denotes a groove formed in one side surface of the substrate 1. The pigtail 4 is inserted into the groove 14 and temporarily fixed to the slits 11 and 12 of the cylindrical portion 10. The terminal plate 3 is configured so as to reliably obtain a contact state with the welded portion 3a. However, such a groove 14 is not always necessary.

According to the present invention, the pigtail wire 4 drawn out of the brush 2 is inserted into the slits 11 and 12 of the cylindrical portion 10 provided integrally with the insulating substrate 1 made of resin. As is clear from FIG. 1 and FIG. 2, it is held in a temporarily fixed state, and in this state, it is brought into contact with the welded portion 3a of the terminal plate 3 through the through hole 5 of the substrate 1, and these are clearly seen from FIG. As described above, the two can be welded and joined by the welded portion 20 by sandwiching the pair of spot welding electrodes 21 and 22 and performing spot welding.

Here, at least one of the slits 11 and 12 formed at at least two positions of the cylindrical portion 10 may have a width dimension or shape capable of temporarily fixing the pigtail wire 4 in a tightly fitted state. .

FIG. 2 shows a part of the pigtail wire 4 drawn from the brush 2 in the brush holder provided on one side surface of the insulating substrate 1 made of resin. As described above, while holding the other part of the pigtail wire 4 with the other finger or an appropriate jig or the like while pressing with the finger or an appropriate holding jig or the like, the cylindrical Temporary fixing slits 11 and 12 of part 10
Can be temporarily fixed to the tubular portion 10 easily.

In this state, the pigtail line 4
Comes into contact with the welded portion 3a of the terminal plate 3 on the other side of the substrate 1 provided facing the through hole 5 in the cylindrical portion 10. Therefore, in this temporarily fixed state,
These are welded and joined by welding means such as spot welding, so that the welding and joining of the pigtail wire 4 and the terminal plate 3 does not require the use of special positioning jigs and attachments as in the past and the attachment and detachment thereof. In addition, the flow of the assembly line can be easily and reliably performed without interruption.

In particular, in such a configuration, since the pigtail wire 4 can be temporarily fixed by the tubular portion 10 on the substrate 1, a special positioning jig for positioning the pigtail wire 4 or the like in advance as in the prior art is used. Since there is no need for an attachment or attachment, no troublesome attachment / detachment work is required, and the flow of the assembly line is not interrupted, there is an advantage that automatic assembly and automatic welding can be easily achieved.

Therefore, according to the above-described configuration, the number of steps for welding the pigtail wire 4 from the brush 2 to the terminal plate 3 is reduced, and the insulation between the terminal plates 3 and 3 for the positive and negative terminals due to the attachment of the brush carbon powder. It is possible to prevent deterioration and the like. In particular, the latter is to prevent insulation deterioration by separating the brush 2 and the terminal plates 3 and 3 by the insulating substrate 1 and the wall of the terminal plate 3 by the welded portion 3a. Since there is no transmission hole between them, the adhesion of the brush powder to the terminal plates 3 and 3 can be prevented.

Further, according to the above configuration, the brush 2
Terminal board 3 of pigtail line 4 drawn out from
3 can be set on the substrate 1 in the immediate vicinity of the brush holder, so that there is an advantage that the length of the pigtail wire 4 can be optimized.

The present invention is not limited to the structure of the embodiment described above, and it goes without saying that the shape, structure, etc. of each part can be appropriately modified or changed. For example, in the embodiment described above,
Although only one of the brush 2 and the terminal plate 3 for the positive and negative terminals has been illustrated and described, the effect can be exerted by applying to both the positive and negative terminals.

In short, according to the present invention, the welding connection between the pig tail wire 4 drawn out of the brush 2 and the terminal plate 3 held and fixed on the other side of the insulating substrate 1 is provided integrally with the above-mentioned substrate. What is necessary is just to employ | adopt the cylindrical part 10 with the slits 11 and 12 skillfully, and to make it easy to carry out, and a motor with a brush, a similar apparatus, and an apparatus are considered as the applicable equipment.

[0027]

As described above, according to the brush holding structure of the present invention, a brush holder for holding a brush slidingly contacting the commutator peripheral surface is provided on one side and pulled out from the brush. A terminal board to be welded and connected to the pigtail wire is provided with a resin insulating substrate held and fixed on the other side, a through hole is formed in a part of the substrate, and the through hole is formed on one side of the substrate. A cylindrical portion is integrally formed so as to surround the peripheral portion of the cylindrical portion, and a slit capable of temporarily fixing a pigtail line is provided at at least two positions facing each other in the cylindrical portion peripheral wall portion, and the pigtail line is formed in a through hole in the cylindrical portion. , So that it can be welded and joined to a part of the terminal plate, so that despite the simple structure, various excellent effects listed below can be obtained.

No special jig or attachment for welding and joining of the pigtail wire from the brush to the terminal plate and the attachment and detachment man-hours are required. In addition, since welding can be easily performed without interrupting the flow of the assembly line as in the related art, automatic assembly and automatic welding can be achieved.

The brush and the terminal plate are separated from each other by a wall formed by a welding portion of the insulating substrate or the terminal plate,
Since there is no transmission hole, it is possible to prevent brush powder from adhering to the terminal plate, maintain insulation between the terminal plates for the positive and negative terminals, and prevent deterioration of the insulation.

Since the welding point of the pigtail wire drawn from the brush to the terminal plate can be set on the substrate in the immediate vicinity of the brush holder, the length of the pigtail wire can be optimized.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an essential configuration of an embodiment of a brush holding unit structure according to the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a welding operation of a pig tail wire drawn out of a brush and a terminal plate in the brush holding structure according to the present invention;

FIG. 3 is a schematic cross-sectional view for explaining a welding connection state by spot welding between a lead wire drawn out of a brush and a terminal plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulating substrate made of resin 2 Brush 3 Terminal plate 3a Welded part 4 Pigtail wire 5 Through hole 10 Tubular part 11 Temporary fixing slit 12 Temporary fixing slit 20 Welding joint 21 Spot electrode 22 Spot electrode

Claims (1)

(57) [Scope of request for utility model registration] 1. A brush holder for holding a brush slidably in contact with a circumferential surface of a commutator of a rotary shaft is provided on one side surface, and a terminal plate welded and connected to a pigtail wire drawn from the brush is provided. In a brush holding portion structure including a resin insulating substrate held and fixed to a side surface side, a through hole is formed in a part of the insulating substrate, and a periphery of the through hole on one side surface of the insulating substrate. A cylindrical portion is integrally formed with the portion, and slits capable of temporarily fixing the pigtail line are provided at least at two positions facing each other in the peripheral wall portion of the cylindrical portion, and the pigtail line is formed with a through hole in the cylindrical portion. A brush holding portion configured to be capable of being welded and joined to a part of the terminal plate via a wire.