JPH0140302Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brush holding device for holding brushes of a rotating electrical machine such as an electric motor.

[Prior Art] As shown in FIG. 4, a brush holding device used in a conventional DC machine, etc. has a hole 1 into which a rotating shaft of a rotating electrical machine is inserted, and is used to hold a stator of a rotating electrical machine. The brush holding plate 2 fixed to the brush holding plate 2 and the brush holder 3 holding the brush are integrally molded from synthetic resin, and a brush (not shown) is held in the brush holding portion 3a of the holder 3. ing.

[Problems to be solved by the invention] However, in this type of conventional brush holding device, when the brush generates heat, the synthetic resin brush holder 3 is deformed by the heat, and the brush holding portion 3a of the holder contracts. As a result, the brush could no longer move within the brush holding portion 3a, resulting in poor energization.

The purpose of this invention is to provide a rotating electric machine that can hold brushes in a state where they can always move smoothly, cool the brush holder efficiently, and easily fix the brush holder. An object of the present invention is to provide a brush holding device.

[Means for Solving the Problems] The present invention includes a synthetic resin brush holding plate having a hole into which a rotating shaft of a rotating electric machine is inserted, and a mounting portion having a gap into which the brush holding plate can be inserted. a metal brush holder that integrally includes a brush holding part for holding a brush and a heat sink part and is attached to the brush holding plate with the brush holding plate engaged in the mounting part; The mounting portion of the holder is provided with a claw engaging hole that opens into the gap, and the brush holding plate is provided with a claw engaging hole that opens into the gap when the brush holding plate is inserted into the gap of the mounting portion. A resiliently engaging pawl is provided.

[Function] With the above configuration, since the brush holder is made of metal, the brush holder does not deform as in the conventional case even if the brush generates heat. Therefore, the brush can always be held in a state where it can move smoothly relative to the brush holder, and poor contact of the brush will not occur. Further, since the heat sink portion is provided at the mounting portion of the brush holder, it is possible to prevent the temperature of the brush holding plate that holds the brush holder from rising, and the brush holder can be efficiently cooled. Furthermore, the attachment part of the brush holder is provided with a pawl engaging hole, and the brush holding plate is provided with a pawl that engages with the pawl engaging hole elastically, so that the brush holding plate can be engaged with the attachment part of the holder. Therefore, the brush holder can be reliably positioned and fixed to the brush holding plate, and the work of installing the brush holder can be facilitated.

[Example] In Fig. 1 a, b to Fig. 3 a, b, 11
This is a synthetic resin brush holding plate which is attached to the stator of a rotating electrical machine such as an electric motor and has a hole 12 in the center into which the rotating shaft of the rotating electrical machine is inserted.
This brush holding plate 11 is arranged around the hole 12 and has a pair of positioning recesses 13, 13 at diagonal positions.
are formed, and these positioning recesses 13 are used to position a brush holder, which will be described later. Protruding claws 14, 14, . . . having a triangular cross section are formed at predetermined positions between the pair of positioning recesses 13, 13 and the central hole 12 on the back surface of the brush holding plate 11. A metal brush holder 15 is positioned in each positioning recess 13 of the brush holding plate 11 and attached to the brush holding plate 11. This brush holder 15 includes a brush holding part 16 for holding a brush (not shown) and the brush holding plate. Attachment portion 17 having a gap into which 11 can be inserted
It is made up of. One end of the brush holding portion 16 facing the hole 12 of the brush holding plate 11 is curved to match the shape of a brush (not shown), and the other end is open for drawing out lead wires and the like. The mounting portion 17 is composed of a U-shaped portion 18 extending from the brush holding portion 16 and a heat sink portion 19 that is formed continuously with the U-shaped portion 18 and extends parallel to the bottom portion 16a of the brush holding portion 16. Part 1
Both ends of the brush holder 9 are formed in a shape that extends long in a direction perpendicular to the direction in which the brush holding parts 16, 16 face each other. The heat dissipation plate portion 19 has claw engaging holes 2 that fit into the protruding claws 14 of the brush holding plate 11.
0,20 are formed.

In the brush holding device of the present invention configured as described above, the mounting portion 1 of the brush holder 15 is located in the positioning recesses 13, 13 of the brush holding plate 11.
7 and attach the brush holder 15. At this time, the claw engaging holes 20, 20, . . . of the brush holder 15
are the protruding claws 14, 14 of the brush holding plate 11,
..., so that the brush holder 15 can be positioned and attached to the brush holding plate 11 easily and reliably.

[Effects of the Invention] As described above, according to the present invention, since the brush holder is made of metal, the brush holder does not deform as in the conventional case even if the brush generates heat. Therefore, the brush can always be held in a state where it can move smoothly relative to the brush holder, and there is an advantage that poor contact of the brush does not occur. In addition, since a heat dissipation plate section is provided at the mounting section of the brush holder, it is possible to prevent the temperature of the brush holding plate that holds the brush holder from rising, and there is an advantage that the brush holder can be efficiently cooled. . Furthermore, since the brush holder can be elastically attached to the brush holding plate, there is an advantage that positioning and fixing of the brush holder can be done easily and reliably.

[Brief explanation of the drawing]

Figures 1 a and b are a plan view and a longitudinal cross-sectional view of essential parts showing an embodiment of the present invention, Figures 2 a and b are front and back plane views of a brush holding plate according to the present invention, and Figure 3 a and b are a plan view and a side view of a brush holder according to the present invention, and FIG. 4 is a perspective view of a brush holder of a conventional brush holding device. 11... Brush holding plate, 12... Hole, 1
3...Positioning recess, 14...Protrusion claw, 15...
Brush holder, 17... Attachment part, 19... Heat sink part, 20... Claw engagement hole.

Claims (1)

[Scope of utility model registration request] A synthetic resin brush holding plate having a hole into which a rotating shaft of a rotating electric machine is inserted, a mounting part having a gap into which the brush holding plate can be inserted, a brush holding part for holding the brush, and a heat sink part are integrated. and a metal brush holder that is attached to the brush holding plate with the brush holding plate engaged in the mounting part, and the mounting part of the brush holder has a pawl that opens in the gap. A mating hole is provided, and the brush holding plate is provided with a claw that elastically engages with the claw engaging hole when the brush holding plate is inserted into the gap of the mounting portion. Brush holding device for rotating electric machines featuring