JPH0223097Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a brush mounting device for a small motor, and in particular, the structure is extremely simple, the spring brush sits well, the contact position with respect to the commutator is stable, and the device is extremely simple. The present invention relates to a mounting device applicable to small motors.

Prior art The conventional example will be explained with reference to Figs. 1 and 2. The one shown in Fig. 1 is a device described in Japanese Utility Model Publication No. 45-27465. Motor case 1
A pair of downwardly recessed rectangular notches 2 are provided in the plate to form a flat protruding piece 3, and the spring part 4a of the spring brush 4 is fitted and held in the protruding piece 3, so that at least one of the brushes is Since one end 5 was brought into contact with the commutator 7, the inner diameter part 4b of the spring part 4a was supported by the corner part 3a of the protruding piece, but the outer diameter part 4c was not supported at all. For this reason, the spring brush 4 is not seated properly.
The disadvantage is that the contact position and angle with respect to the commutator 7 are not stable, and the output of the motor tends to vary. Furthermore, since a fairly large space is created between the spring portion 4a and the notch 2, there is a possibility that foreign matter such as dust may enter through this space.

The device shown in FIG. 2 is a device described in Japanese Utility Model Publication No. 45-11697, in which the edge 8 of the motor case 8 is insulatively divided.
2 with the base 9a facing inward with an appropriate distance from a.
A cylindrical body 10 is integrally formed by providing two L-shaped notches 9, and the portion sandwiched by these notches is bent to form an integral cylindrical body 10, and the spring part of the spring brush is fitted into this cylindrical body 10. It is something that can be maintained. According to this invention, the inner diameter part of the spring part of the spring brush is supported by the outer circumferential surface 10a of the cylindrical part 10, and a considerably long fitting length can be obtained, so that the spring brush can sit well and its position relative to the commutator can be adjusted. Although it is stable, it requires molding of the cylindrical portion 10, so it cannot be applied to motors that are not larger than a certain extent, and it has the disadvantage that it cannot be put to practical use in ultra-small motors.

Purpose The present invention was made to eliminate the drawbacks of the prior art described above, and its purpose is to provide a downwardly recessed notch in a motor case that is insulated from each other and divided into parts. At the same time, a protruding piece consisting of a horizontal portion continuously bent on the motor case and a vertical portion formed continuously bent on the horizontal portion is formed to protrude toward the inside of the motor case, and the spring portion of the spring brush is By supporting the inner diameter part of the spring part at two points on the corner part of the protruding piece and supporting the outer diameter part of the spring part at two points on the corner part of the notch, the spring part is supported at a total of four points, and the spring part is supported at four points in total. The purpose is to improve the sitting position of the brush, thereby stabilizing the contact state of the spring brush with the commutator, so that the brush always contacts the commutator at right angles. Another purpose is to facilitate machining by making the width of the notch provided in the motor case equal to the width of the protruding piece. It is an object of the present invention to provide a brush mounting device that can be easily implemented even for an ultra-small motor having a motor case with a height of 9 mm or less. Still another objective is to narrow the width of the notch provided in the motor case to reduce the gap created by the notch so that the gap is not blocked by the spring portion of the brush. To prevent foreign matter such as dust from entering the motor case from the outside.

Summary In summary, the present invention provides a motor case which is insulated and divided into parts, and is provided with a downwardly recessed notch to form a protruding piece, and a spring portion of a spring brush is attached to the protruding piece, so that at least one end of the brush is attached. in contact with a commutator,
The protruding piece includes a horizontal portion that is bent and formed continuously on the motor case, and a vertical portion that is bent and formed continuously on the horizontal portion. The inner diameter portion of the spring portion is supported at two corner points of the protruding piece, and the outer diameter portion of the spring portion is supported at two corner points of the notch.

Configuration The present invention will be described below based on embodiments shown in the drawings. What is shown in FIGS. 3 to 7 is a first embodiment of the present invention, and as described above, the ultra-small motor 11 is a motor with dimensions of, for example, about 14 mm in length, 10 mm in width, and 9 mm in height. The motor case has a case 12, which is made of a conductive material (for example, a mild steel plate), and is divided into two parts insulated from each other, with each motor case 12A and 12B serving as a positive electrode and a negative electrode. and the edge 1 of the motor case 12
The motor case 12 is attached to 2a by press processing.
A horizontal portion 13 is formed to be bent in the horizontal direction continuously.
A protruding piece 13 is formed to protrude inside the motor case 12. The protruding piece 13 consists of a vertical part 13f that is bent in the vertical direction and continuous with the horizontal part. A rectangular recessed notch 14 is formed toward the bottom of the motor case 12. The width of the protruding piece 13 may be the same as the width of the notch 14, and therefore it can be easily formed by punching using a simple press. The dimensions that should be carefully controlled here are:
The amount of protrusion of the protrusion piece 13, that is, the distance e between the inner surface 12b of the motor case 12 and the one surface 13b of the protrusion piece 13, is the distance e when the spring portion 4a of the spring brush 4 is fitted into the protrusion piece 13 and attached. The inner diameter portion 4b of the spring portion 4a is the protruding piece 1.
3, and the outer diameter portion 14c touches the two corners 14c, 14d of the notch 14.
It is managed so that the points touch each other. This dimension e is the spring part 4a of the spring brush 4.
The distance e will vary depending on the diameter and wire diameter of the spring, but once these dimensions are determined, the distance e will be determined by itself, and when the spring brush 4 is fitted into the protruding piece 13, as shown in FIG. Inner diameter part 4 of part 4a
b is formed by the two corners 13c and 13d of the protruding piece 13, and the outer diameter portion 4c is formed by the corner 14c of the notch 14,
Each is supported by 2 points of 14d, with a total of 4 points =
It will definitely be supported soon. Therefore, when assembling the spring brush 4, it is sufficient to simply fit the brush into the protruding piece 13 from above. One end 4d of the spring brush 4 is in contact with the commutator 15, and the other end 4e is in contact with the inner surface 12b of the motor case 12, and a clockwise pressing force is applied to the one end 4d of the spring brush 4 in FIG. I will do it. Note that the protruding piece 13 may have a flat plate shape as shown in the figure, and no deformation processing is required. Also, this brush mounting device 16 is attached to the motor case 12.
A pair of identical configurations are provided for both A and 12B.

In the figure, 17 is the rotor, 18 is the winding, 19 is the insulator of the commutator 15, 20 is the rotating shaft of the motor 11,
21 is a magnet, 22 and 23 are side walls of the motor case 12, and 25 is a bearing.

What is shown in FIGS. 8 and 9 is the second embodiment of the present invention.
This is an example, and in this case, the motor case 12
2 on the protruding piece 13 formed protruding from the edge 12a of the
The spring brushes 4 and 24 of the book are attached, and one end 24d of the spring brush 24 is in contact with the commutator piece 15a of the commutator 15, which is in contact with the one end 4d of the spring brush 4.
The commutator bar 15b is placed in contact with the commutator bar 15b adjacent to the commutator bar 15b, thereby preventing the generation of sparks when the electrical position passes. Since the other configurations are the same as those in the first embodiment, the same parts are given the same reference numerals in the drawings and the description thereof will be omitted.

Function The present invention is constructed as described above, and its function will be explained below. 3 to 7, when assembling the spring brush 4,
The spring portion 4a of the spring brush is attached to the protruding piece 1.
3 and the notch 14 from above, and thereby the inner diameter part 4b of the spring part 4a
is supported at two points, corners 13c and 13d of the protruding piece 13, and its outer diameter portion 4c is supported at the corner 14 of the notch 14.
Since it is supported at two points c and 14d, it has extremely good stability, and one end 4d always contacts the commutator 15 at right angles. Therefore, there is no variation in the output of the motor 11. Further, since the protruding piece 13 may be in the shape of a flat plate, press working is easy, and it can be sufficiently applied to the ultra-small motor 11. Furthermore, the motor case 12
When the spring brush 4 is attached to the spring part 4a, as shown in FIG.
Since the gap created by 4 is closed, foreign matter such as dust is prevented from entering the motor 11.

Next, referring to FIGS. 8 and 9, the case of attaching two spring brushes 4, 24 will be explained. First, the spring brush 24 is inserted into the protruding piece 13 from above and placed on the bottom surface 14a of the notch 14. Then, the spring brush 4 is inserted and placed on the spring brush 24. As a result, both brushes are supported at four points by the protruding pieces 13 and the notches 14, resulting in good seating. Also, both brushes 4, 24
When the spring brush 4 passes through a position where it receives rectification (commutation) (hereinafter referred to as the rectification position), one end 4d of the spring brush 4 is connected to the commutator piece 15a of the commutator 15, and one end 24d of the spring brush 24 is in a dogleg shape. Since it is bent, it comes into contact with the adjacent commutator piece 15b. Therefore, no sparks are generated when passing through the rectification position, and no radio wave interference occurs.

Further, in the above embodiment, the spring brush 4,
The other ends 4e, 24e of 24 are pressed against the inner surface of the motor case 12, and the other ends 4d, 24d
is pressed against the commutator 15 with an appropriate pressing force.

In the embodiment shown above, the motor case 12 is described as having a rectangular shape, but it is clear that the motor case 12 is not limited to the rectangular shape and may be round.

Effects Since the present invention is constructed and operates as described above, a downwardly recessed notch is provided in the motor case which is insulated and divided from each other, and the motor case is continuously bent. A protruding piece consisting of a horizontal part and a vertical part continuous with the horizontal part is formed to protrude toward the inside of the motor case, and the inner diameter part of the spring part of the spring brush is connected to the corner of the protruding piece. By supporting the spring part at two points, and supporting the outer diameter part of the spring part at two points at the corner of the notch, the spring part can be
Since it can be supported at a point, it has the effect of making the spring brush sit better, and as a result, the contact state of the spring brush with the commutator can be stabilized, and the brush always contacts the commutator at right angles. As a result, it is possible to obtain the effect that there is no variation in the output of the motor. Furthermore, since the width of the notch provided in the motor case and the width of the protruding piece may be made equal, processing is easy. This has the effect of providing a brush mounting device that can be easily implemented even for small motors. Furthermore, since the width of the notch provided in the motor case can be narrowed, the gap created by the notch can be reduced, and the gap will not be blocked by the spring portion of the brush. ,
It is also possible to prevent foreign matter such as dust from entering the motor case from outside.

[Brief explanation of drawings]

Figures 1 and 2 relate to a conventional example; Figure 1 is a perspective view of a brush mounting device in which a narrow protruding piece is formed in the same plane as the motor case, and Figure 2 is a cylindrical protruding piece. 3 to 7 are perspective views of a molded brush mounting device, and FIG. 3 is a perspective view of a brush mounting device showing the relationship between a single brush, protruding pieces, and notches, and FIG. 3 is a perspective view of a molded brush mounting device. FIG. 4 is a plan view of the brush mounting device; FIG. 5 is a perspective view of a small motor equipped with the mounting device of the present invention; FIG. The figure is a perspective view of the brush mounting device.
8 and 9 relate to the second embodiment of the present invention,
Fig. 8 is a perspective view of the brush mounting device, and Fig. 9 is a perspective view of the brush mounting device.
2 is a plan view of what is shown in the figure; FIG. 4, 24 are spring brushes, 4a, 24a are spring parts, 4b, 24b are inner diameter parts, 4c, 24
c is the outer diameter part, 4d, 24d are one end, 12, 12
A, 12B are motor cases, 13 is a protruding piece, 13
c, 13d are corner portions, 13e are horizontal portions, 13f are vertical portions, 14 are notches, 14c, 14d are corner portions, 1
5 is a commutator, and 16 is a brush mounting device.

Claims (1)

[Scope of utility model registration request] A protruding piece is formed by providing a downwardly recessed notch in a motor case that is insulated and divided from each other, and a spring portion of a spring brush is attached to the protruding piece so that at least one end of the brush contacts a commutator. In the motor case, the protruding piece is formed to protrude toward the inside of the motor case, and includes a horizontal portion that is bent and formed continuously on the motor case, and a vertical portion that is bent and formed continuously on the horizontal portion. , wherein the inner diameter part of the spring part is supported at two points at the corners of the protruding piece, and the outer diameter part of the spring part is supported at two points at the corners of the notch. Brush attachment device in motor.