JPS6223240Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat motor, and particularly to improvements in brush holders.

In a conventional flat motor 1, as shown in FIG. 1, a magnet 3 is mounted inside a casing 2, and an armature 4, a hub 5 supporting the armature 4, a rotor shaft 6, and a bearing 7 are housed opposite the magnet 3. A brush 8 comes into contact with this armature 4 with elasticity, and power is supplied to this brush 8 from a power supply line 9.

In addition, in the figure, 10 is a brush holder, and 12 is a spring.

By the way, the brush holder 10 that supports the brush 8 in this flat motor is composed of a brush rocker 10a in which the brush 8 is stored and a rocker support 10b made of a sound absorbing material such as rubber. Since the rocker support 10b protrudes from the casing 2, not only the vibration sound of the brush 8 leaks outside and causes noise, but also the rocker support 10b
The flatness of the casing 2 is impaired by the length of the outward protrusion, and furthermore, the brush 8 and the brush rocker 10a are tilted due to thermal changes and changes over time in the rubber of the rocker support 10b, which may become a source of noise. There are also. Moreover, Lotscar Support 10
When attaching the rocker support 10b to the casing 2, it is necessary to fix the rocker support 10b to the casing 2 by baking or the like, and the assembly work is complicated.

The present invention eliminates the drawbacks of the conventional ones mentioned above, prevents the vibration noise of the brushes from leaking to the outside, makes the motor shape flatter, and supports the brushes etc. stably. It is characterized by an outer cylinder fixed to the casing by mechanical continuity means, an inner cylinder arranged at a distance from the outer cylinder, and an inner cylinder interposed between the outer cylinder and the inner cylinder,
and a buffer tube made of an insulating elastic material and having a bottom wall in contact with the casing.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 2 shows a brush holder 20 for a flat motor according to the present invention, and this brush holder 20 has an outer cylinder 21. As shown in FIG. This outer cylinder 21
has a rectangular tube shape, and has a pair of brackets 22, 22 protruding from its base, and a longitudinal slit 24 formed on one side. Note that the bracket 22 has a screw hole 23 formed therein.

An inner cylinder 25 is loosely fitted into the outer cylinder 21, and the inner cylinder 25 is connected to the outer cylinder 21 and a buffer cylinder 2, which will be described later.
They are arranged at intervals equal to the wall thickness of 6.
Further, the length of the inner cylinder 25 is shorter than the outer cylinder 21 by the thickness of the buffer cylinder 26. On one side of this inner cylinder 25, there is a slit 2 of the outer cylinder 21.
A slit 27 having the same width as 5 is formed at a position matching the slit 24 from the tip to the center in the longitudinal direction.

The inner peripheral surface of the outer cylinder 21 and the inner cylinder 25
The buffer cylinder 26 made of an insulating elastic material such as rubber is interposed in the gap between the outer peripheral surfaces of the cylinder. This buffer cylinder 26 has the same length as the outer cylinder 21 and has a bottom wall 28.
The inner cylinder 25 is seated on the cylinder 8. A longitudinal slit 29 having the same width as the slit 24 of the outer cylinder 21 is formed on one side of the buffer cylinder 26 at a position that matches the slit 24.

As shown in FIG. 3, a brush 8 pressed by a spring 12 is slidably disposed in the inner cylinder 25 of the brush holder 20 described above. Further, the brush holder 20 is screwed into the casing 2 through the screw hole 23 of the bracket 22 by a screw 30 serving as a mechanical connection means.

According to the above-mentioned configuration, the vibration noise of the brush 4 is absorbed by the buffer tube 26, so it does not leak to the outside, and even if the rubber of the buffer tube 26 deteriorates due to thermal changes and changes over time, the vibration noise of the brush 4 is absorbed by the outer tube 21. is tightly screwed onto casing 2, so
There is no risk that the brush holder 20 will tilt. Furthermore, since the member supporting the brush holder 20 does not protrude from the outer surface of the casing 2, the flat motor becomes flat, and there is no possibility that the brush holder 20 will tilt due to external force. Furthermore, since the buffer tube 26 also has insulation properties, the brush 4 can also be insulated. Furthermore, tighten the outer cylinder 21 with the screw 30.
Alternatively, since it is fixed to the casing 2 by mechanical coupling means such as caulking, the assembly work is much easier than the conventional fixation by baking.

As explained above, the flat motor according to the present invention includes an outer cylinder fixed to the casing by a mechanical connection means, an inner cylinder arranged with a distance from the outer cylinder, and a structure between the outer cylinder and the inner cylinder. The structure is made up of a buffer tube made of an insulating elastic material with a bottom wall in contact with the casing, which prevents the vibration noise of the brushes from leaking outside, and allows the casing to be made flat. The brush can be stably supported, the insulating effect of the brush is improved, and the assembly work is also improved.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view showing a conventional flat motor, Fig. 2 is a perspective view showing an embodiment of the brush holder of the flat motor of the present invention, and Fig. 3 is a state in which the brush holder shown in Fig. 2 is attached to a casing. FIG. 2...Casing, 3...Magnet, 4...
amateur, 8...brush, 12...spring, 6...rotating shaft, 20...brush holder, 21
...Outer cylinder, 25...Inner cylinder, 26...Buffer cylinder.

Claims (1)

[Scope of utility model registration request] A flat motor in which a brush holder attached to the casing supports a brush that cuts off the magnetic flux of a magnet provided in a flat casing and supplies current to a rotating armature, the brush holder being mechanically connected to the casing. an outer cylinder fixed to the casing, an inner cylinder spaced apart from the outer cylinder, and an insulating elastic body interposed between the outer cylinder and the inner cylinder and having a bottom wall in contact with the casing. 1. A flat motor characterized by comprising a buffer tube made of a material.