JPH022060Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brush mounting structure for a small motor, and particularly to a brush mounting structure that allows the motor body to be made thinner.

Conventionally, in the brush mounting structure of this type of small motor, a brush terminal is generally fixed to a bracket using eyelets, screws, or the like. Such a mounting structure requires extra space for the eyelet and the head of the screw, which increases the thickness of the motor body, making it difficult to satisfy the desire for a thinner motor.

Further, when fixing the brush terminal, caulking work or screw tightening work is required to attach the eyelet, which tends to increase the number of man-hours for the installation work.

SUMMARY OF THE INVENTION An object of the present invention is to provide a brush mounting structure for a small motor, which eliminates the drawbacks of the prior art and allows a brush terminal to be fixed without the need for eyelets or screws.

In order to achieve this purpose, the present invention includes a rotor in which a coil, a commutator, and a rotating shaft are integrated, a magnet mounting plate to which a disk-shaped permanent magnet is fixed,
In a small motor consisting of a brush terminal with a brush fixed to one end, a cup-shaped bracket that houses the rotor, magnet mounting plate, and brush terminal, and a lid that closes the opening side of the cup-shaped bracket, the motor is guided to the magnet mounting plate. Fit and install the parts,
The brush terminal is placed and positioned on this guide member, and the guide member and brush terminal are sandwiched and fixed between the magnet mounting plate and the lid.

Hereinafter, the brush mounting structure of the small motor of the present invention will be explained in detail with reference to the drawings.

Fig. 1 is an exploded perspective view showing one embodiment of the brush mounting structure of a small motor of the present invention, Fig. 2 is a front view of the main parts of the motor in cross section, and Fig. 3 is a bottom view of the motor shown in Fig. 2. It is a diagram.

In FIG. 1, reference numeral 1 denotes a cup-shaped bracket made of magnetic material, and an oil-less bearing 2 is mounted in a hole 1a formed in the center of the bottom surface, as shown in FIG. Also, on the inner circumference of this bracket 1,
A stepped portion 1b having a larger diameter on the opening side is formed, and a cutout portion 1c is provided at the opening end.

3 is a rotor which is housed in the bracket 1 and has a coil 4 molded into a disc shape from synthetic resin, and a commutator 5, a spark quenching element 6, and a rotating shaft 7 are integrally provided in the center of the molded body.

Reference numeral 8 denotes a disk-shaped magnet mounting plate provided above the rotor 3. The outer diameter of this magnet mounting plate is approximately equal to the inner diameter on the larger diameter opening side of the bracket 1. A circular hole 8a passing through the mounting plate 8 and a cutout hole 8b continuous with the circular hole 8a are bored in the center of the mounting plate 8. Further, a disk-shaped permanent magnet 9 having a circular hole in the center is fixed to the lower surface of the magnet mounting plate 8 by appropriate means such as adhesive, and the upper surface has a plurality of projections 8c formed at predetermined positions.
C-shaped middle plate 10 with a hole 10a into which the
is fixed by welding etc.

Incidentally, the magnet mounting plate 8 to which the permanent magnet 9 and the intermediate plate 10 are fixed is adapted to be stopped by the stepped portion 1b of the bracket 1.

Further, in the exposed portion of the magnet mounting plate 8 formed when the middle plate 10 is attached, the guide member 11 is connected to the mounting hole 8d provided in the magnet mounting plate 8 and the guide member 1
A brush 13 is attached to one end of the guide member 11 via a first insulating sheet 12 in the form of a film.
A brush terminal 14, which is fixed by welding or the like, is mounted. When the brush terminal 14 is placed on such a guide member 11, the brush 1
3 is located in the notch hole 8b, and the other end of the brush terminal 14 opposite to the fixed end of the brush 13 is located in the bracket 1.
It begins to protrude to the outside of the body.

Further, a second insulating sheet 15 in the form of a film is placed on the upper surface of the brush terminal 14, and on the surface of the insulating sheet 15, the rotating shaft 7 of the rotor 3 is placed at the center.
A lid body 17 made of a disc-shaped magnetic material is mounted on which a thrust bearing 16 for receiving the upper end of the lid body 17 is attached.

This lid 17 closes the opening side of the bracket 1 and also presses and clamps the guide member 11 between it and the magnet mounting plate 8.

The joint portion of the lid 17 and the bracket 1 are integrated by welding, for example, to obtain a motor as shown in FIG. 2.

In one embodiment configured in this manner, since the brush terminal 14 is clamped between the magnet mounting plate 8 and the lid body 17 via the two insulating sheets 12 and 15, there is no problem. The brush terminal 14 can be firmly fixed without using eyelets or screws.

Since the brush mounting structure of the small motor of the present invention is constructed as described above, the brush terminal can be fixed without using eyelets or screws. The thickness dimension of the motor body can be reduced by the dimension of 1, which has the effect of making the motor body thinner. In addition, the brush terminal can be fixed simply by stacking and assembling each component without requiring the conventional caulking or screw-fastening work, which has the effect of reducing the number of installation work compared to the conventional method.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the brush mounting structure of a small motor according to the present invention, Fig. 2 is a front view showing a main part of the motor in cross section, and Fig. 3 is an illustration of the motor shown in Fig. 2. It is a bottom view. 1... Bracket, 3... Rotor, 8... Magnet mounting plate, 9... Permanent magnet, 13... Brush, 14
... Brush terminal, 17 ... Lid body.

Claims (1)

[Scope of utility model registration request] A rotor in which a coil, a commutator, and a rotating shaft are integrated, a magnet mounting plate to which a disc-shaped permanent magnet is fixed, a brush terminal to which a brush is fixed to one end, and the rotor, magnet mounting plate, and brush terminal are housed. In a small motor consisting of a cup-shaped bracket and a lid that closes the opening side of the cup-shaped bracket, a guide member is fitted and attached to the magnet mounting plate, and the brush terminal is placed on the guide member for positioning. A brush mounting structure for a small motor, characterized in that the guide member and the brush terminal are sandwiched and fixed between the magnet mounting plate and the lid.