JPS603664Y2 - Brush device for rotating electrical machines - Google Patents

Description

[Detailed description of the invention] The present invention is a brush device for rotating electric machines such as electric motors and generators, in particular, a brush holder (hereinafter abbreviated as holder) made of a conductive and elastic spring plate, in which a brush is directly attached to the holder. This relates to a brush device that uses the brush as a part of the electrical circuit for the brush.It facilitates the assembly of the brush to the holder, prevents the brush from being damaged in some cases, and solidifies the integration of the two after assembly. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 is a developed view of the brush holder 1, for example 0.12m.
This is a battledore-shaped spring plate cut and punched from a beryllium copper plate of /m.

Both sides of the wide part 2 of this spring plate 1 are bent to face each other from the chain line position 3 to form brush clamping pieces 4, 4, and the clamping pieces 4,
A brush head insertion hole 5 is made on the board surface between 4.

Second. In Figure 3.4, the brush clamping pieces 4, 4 are bent into a U-shape parallel to the plate surface of the spring plate 1, and the distance l between the opposing inward ends of the clamping pieces 4, 4 is determined by the width of the brush 6. It is configured to be smaller than T.

Further, a head 7 having a width t smaller than the width T of the brush 6 and higher than the height between the lower surface of the holding piece 4 and the upper surface of the brush holder is provided on the upper surface of the brush 6.

The brush head 7 has the same shape and size as the insertion hole 5, or is slightly thicker. An example is shown in which the front and rear edges are slopes 10.

The upper surface of the brush head may have sloped sides on both sides and arcuate surfaces on the front and rear edges.

To assemble the brush 6 to the holder, the brush head 7 is inserted into the hole 5 from below the holder, guided along the arcuate surface 9 and the slope 10, until the brush upper surface 6a contacts the lower surface of the holder.

With this insertion, the brush 6 and holder are positioned and connected.

When inserting the brush, the height of the brush head 6a is greater than the height position of the clamping piece 4, and the brush width T is larger than the interval l between the clamping pieces, so the inner edge of the clamping piece 4 is placed on the side of the brush. The circular arc surface 8 is used as a guide, and the side surface is fitted into the scraping tendency to elastically firmly clamp the side surface of the brush.

In FIG. 5, the brush clamping pieces 4, 4 are bent into a substantially ■-shape against the plate surface of the spring plate 1, and the tips 11 are folded back outward, and the brush holding pieces 4, 4 are bent upward to the two opposite sides of the brush head insertion hole 5. engaging piece 12
This is an example of cutting and shaping.

In this example, when the brush 6 is press-fitted into the holder 1 and assembled, the engaging pieces 12, 12 and the clamping pieces 4, 4 are pushed outward, and after assembly, the brush 6 is held by its elastic restoring force. Hold firmly.

The place for this example. In this case, since the outward folds 11 act as press-fitting guides for the brush 6, both side edges of the upper surface of the brush do not need to be rounded into an arc shape.

FIG. 6 shows an example in which the brush head 7 and its insertion hole 5 are shaped circularly.

On each of the above sides, the width of the holder 1 is determined in proportion to the width T of the brush 6, so if the brush 6 has a wide width T, the width of the holder will also be wide and the size will be increased.

Therefore, when using the brush 6 with a wide width T, the width is changed to three levels T9 T'? as shown in FIG. t, the part with the minimum width t is used as the insertion head 7, and the middle width part 6a is press-fitted between the brush holding pieces, which has the advantage that the width of the holder can be kept to a certain width. be.

In this invention, by inserting the head of the brush into the hole of the holder as described above, it is positioned when press-fitting the brush between the clamping pieces, and the press-fitting is performed smoothly, and the brush is sometimes damaged during assembly. Never.

In addition, after the brush is assembled to the holder, the holder and brush are firmly integrated by fitting the brush head and hole and holding both sides of the brush by the clamping pieces, and the electrical connection between the two is ensured. There are effects such as good conduction.

The present applicant has submitted Utility Model Application No. 51-4905 (Utility Model Application Publication No. 53-1)
8485) was first proposed.

The idea is to provide opposing inward U-shaped clamping pieces on both sides of the spring plate holder, to accommodate the enlarged head of the brush in the U-shaped space, and to place the protruding top surface of the head on the bottom surface of the holder. The lower surface of the head protruding from the side surface of the brush is received by the inward bottom of the U-shaped holding piece, and the enlarged head is elastically held between the U-shaped portion and the top surface of the brush. Because it is
The elasticity was a little unreasonable.

Therefore, in the present invention, the head 7 of the brush is tightly fitted into the hole 5 of the holder 1, and the sides of the brush are clamped by the inward clamping pieces provided on the holder, making it easy to assemble. This provides a mechanism that allows for elastic holding.

[Brief explanation of drawings]

Fig. 1 is a developed view of the holder of the present invention, Fig. 2 is a perspective view of the device of the present invention, Fig. 3 is a vertical sectional view taken along line ■-■ in Fig. 2, and Fig. 4 is a line taken along line IV-IV in Fig. 2. The cross-sectional views of FIGS. 5 to 7 show other embodiments. 1 is a holder, 4, 4 are brush holding pieces, 5 is a brush head insertion hole, 6 is a brush, and 7 is a brush head.

Claims (1)

[Scope of utility model registration request] A pair of brush clamping pieces 4, 4 are formed by bending parts of both sides of the brush holder 1, which is made of a conductive spring plate, inwardly facing each other, and the inwardly directed ends of the opposing clamping pieces A head 7 having a width t smaller than the interval and higher than the height between the lower surface of the clamping piece and the upper surface of the brush holder is provided on the upper surface 6a of the brush 6, and the head 7 is provided between the clamping pieces 4, 4. An insertion hole 5 for the brush head 7 is provided in the plate surface of the plate, and the brush head 7 is press-fitted into the hole 5 until the brush upper surface 6a abuts the brush holder lower surface to position and connect the brush and the holder. This is a brush device for a rotating electric machine in which a brush 6 having a width T that is thicker than the interval between the two holding pieces 4, 4 is held from both sides by holding pieces 4, 4.