JPS58144552A - Miniature motor - Google Patents

Abstract

PURPOSE:To alleviate the vibration and noise due to slide between a brush and a commutator in a miniature motor for a vehicle or the like by bonding sheet- shaped elastic materials on the front and back surfaces of an outer edge of a support of an insulating plate which mounts and holds the brush. CONSTITUTION:Sheet-shaped elastic materials 9 are bonded on the front and back surfaces of a support of an insulating plate 6 which mounts and holds a brush 4 in contact with a rotor. For example, four projections are formed on the outer edge of the plate 6, and sheet-shaped elastic materials 9 cut in the length twice the thickness of the plate 6 as compared with the peripheral length of the projections are bonded to the front and back surfaces of the projections. The projections of the plate 6 are buried in the notches of a motor housing 3 through the materials 9 to be retained by an end bracket 3 in assembling a motor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved structure of a small electric motor installed in an automobile or the like, and an object of the present invention is to alleviate vibration and noise caused by sliding between a brush and a commutator.

In a conventional small electric motor, as shown in FIG. The protruding portion 105 is tightened and fixed with a bolt 106 or the like.

However, with the above structure, the brush 107 and commutator 1
Noise and vibration caused by sliding with the brush holding insulating plate 10
1, and further from the insulating plate 101 to the end bracket 192 and the motor housing 104, there is a drawback that the noise is large.

Further, in the conventional examples shown in FIGS. 2 and 3, the protrusion provided at the outer edge of the brush holding insulating plate 110 is directly buried in the notch 113 provided at the outer circumferential edge of the motor housing 112. There was a drawback.

The present invention solves the above-mentioned conventional drawbacks, and embodiments thereof will be described below with reference to FIGS. 4 to 6.

In FIGS. 4 and 5, 1 is an end bracket that holds a bearing 2, etc., and closes the opening of a motor housing 3 equipped with a stator (not shown), and a brush 4 and a brush holder 5 are fixed. The brush holding insulating plate 6 is fixed so as not to fall off. 7 is a commutator, the surface of which is in sliding contact with the brush 4. 8 is the armature shaft. Figures 6 and 7 are component diagrams of the brush holding insulating plate 6.
A sheet-like elastic body 9 cut to a length approximately twice the outside thickness of the insulating plate than the circumference of each protrusion is adhesively fixed to the front and back surfaces of the four protrusion ends provided on the outer edge. It is.

8 to 9 are parts diagrams of the motor housing 3.
0 is a notch for embedding and fixing a protrusion on the outer edge of the brush holding insulating plate 6, and 11 is a protrusion for tightening and fixing with a bolt 13 of the end bracket 1, in which a tapped hole 12 for the bolt is provided.

In the above structure, when the sheet-like elastic body 9 bonded to the brush holding insulating plate 6 is buried in the notch 1o of the motor housing 3, it wraps around the outer edge protrusion of the insulating plate from all sides, as is clear from FIG. The structure is such that it is attached to the motor housing 3 and end bracket 1 completely through elastic bodies. In this case, the sum of the thickness of the insulating plate 6 and the thickness of the two sheet-like elastic bodies 9 in the free state is the axis of the motor housing notch 1o when the end surfaces of the motor housing 3 and the end bracket 1 are in contact with each other. Of course, it should be set larger than the directional dimension. In addition, the notch dimensions in the direction perpendicular to the axis are also set in the same manner.

Therefore, the noise and vibration generated by the sliding movement of the commutator 8 and the brush 4 are damped by the elastic body that wraps around the outer edge of the brush holding insulating plate 6 from all sides, producing the effect of being greatly alleviated.

As described above, according to the present invention, by simply adhering the sheet-like elastic body to the front and back surfaces of the outer edge protrusions of the brush holding insulating plate, and incorporating the insulating plate into the motor housing, the elastic body can be , a mounting structure that wraps around both sides of the insulation board,
This has the effect of greatly alleviating the noise and vibration of the electric motor.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a conventional electric motor, Fig. 2 is a top view showing how the insulating plate for holding the brush is assembled into the motor housing, Fig. 3 is a side view of the same, and Fig. 4 is the invention according to the present invention. A partial sectional view of the electric motor in one embodiment, FIG. 5 is a side view, FIG. 6 is a front view of the brush holding insulating plate, FIG. 7 is a side view, and FIG. 8 is a top view of the motor housing. , FIG. 9 is a side view of the same part. 1...End bracket, 3...
Motor housing 6...Brush holding insulating plate, 9. 0. Sheet-like elastic body. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 (f0 Figure 4 Figure 6 Figure 7 Figure 8 @Figure 9

Claims (1)

[Claims] It has a rotor, a stator, and a housing, and includes an insulating plate on which a brush is attached and held so as to be in contact with the rotor, and a sheet-like elastic body is bonded to the front and back surfaces of at least the outer edge of the support part of the insulating plate. small electric motor.