JP2583275Y2 - Flat motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor with a DC brush, and more particularly to a flat motor used for a vehicle interior air purifier, a room air blower motor, and the like.

[0002]

2. Description of the Related Art In recent years, flat motors have been used in automobile interior fan motors, taking advantage of their thinness and light weight. For this reason, low noise and low cost are required.

A conventional flat motor will be described below. FIG. 2 shows a half sectional view of a conventional flat motor. In FIG. 2, 1 is a commutator, 2 is a rotor formed by resin molding a polygonal single coil, 3 is a bracket A,
4 is a substantially annular magnet 5, a brush 6 sliding on the commutator 1,
This is a bracket B having a brush holder 7 for holding and fixing the brush 6. Reference numeral 8 denotes a rivet, and the brush holder 7 is caulked and fixed to the bracket B4 by the rivet 8.

The operation of the flat motor configured as described above will be described below. By energizing the polygonal single coil of the rotor 2 through the brush 6 and the commutator 1 held by the brush holder 7, magnetic attraction and repulsion occur with the substantially annular magnet 5, and the rotor 2 rotates. Will be done.

[0005]

However, in the above-described conventional configuration, the brush 6 slides on the surface of the commutator 1 with the rotation of the motor. , An uneven carbon coating is formed, and the uneven carbon coating causes a change in the friction coefficient of the sliding portion between the commutator 1 and the brush 6. Since the brush holder 7 is directly caulked and fixed to the bracket B4 with the rivet 8, the commutator 1 and the brush 6
The brush 6 causes self-excited vibration inside the brush holder 7 due to the fluctuation of the friction coefficient of the sliding portion, and an abnormal sound is generated due to resonance between the brush 6 and the brush holder 7. .

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a highly reliable flat motor that can reduce noise and reduce the number of assembly steps.

[0007]

In order to achieve this object, a flat motor according to the present invention is provided with a projection on a bottom plate of a brush holder and an elastic body integrally formed with the brush holder.
The brush holder is sandwiched and fixed between the bracket B and the substantially annular magnet.

[0008]

With this configuration, the brush holder is completely lifted from the bracket B and is fixed to the bracket B via the elastic body, so that the degree of freedom of movement of the brush holder is increased. And even if the brush vibrates inside the brush holder, the brush holder itself can move within the range of the flexure of the elastic body, so the abnormal sound generated by the self-excited vibration of the brush and the resonance of the brush holder Can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a commutator, 2 is a rotor formed by resin molding a polygonal single coil, 3 is a bracket A as a first bracket facing one surface of the rotor 2, and 5 is a rotor. 2 is a substantially annular magnet provided so as to face the other surface, 14 is a bracket B as a second bracket on which the substantially annular magnet is mounted, 18 is a brush that holds and fixes the brush 6, and a projection is provided on the bottom plate. Brush holder 1
7 is an elastic body integrally formed. The brush holder 17 is connected to the bracket B14 and the substantially annular magnet 5 via an elastic body 18.
And has a configuration in which it is fixed.

[0011] The flat motor constructed as described above also has a speed of 1000 rpm similarly to the conventional flat motor.
The low-speed rotation of about m causes self-excited vibration of the brush 6 inside the brush holder 17 and resonance between the brush 6 and the brush holder 17.

However, the brush retainer 17 is connected to the elastic body 1.
The brush holder 17 is completely floated from the bracket B14 by being sandwiched and fixed between the bracket B14 and the substantially annular magnet 5 through the brush 8, and the brush 6 vibrates inside the brush holder 17 by stick-slip. However, since the brush holder 17 has a degree of freedom to move within the range of the amount of deflection of the elastic body 18, the self-excited vibration of the brush 6 and resonance with the brush holder 17 can be suppressed. As a result, it is possible to prevent abnormal sounds that occur.

Further, the projections provided on the bottom plate of the brush holder 17 can position the brush holder 17 with respect to the elastic body 18 and prevent the brush holder 17 from falling off. Further, at the same time as attaching the substantially annular magnet 5 to the bracket B14. Since the brush holder 17 can be fixed via the elastic body 18, the step of caulking the brush holder 17 with rivets, which has been required conventionally, can be omitted.

[0014]

As described above, according to the present invention, a projection is provided on the bottom plate of the brush holder, and the brush holder is held and fixed to the bracket B via an elastic body integrally formed with the brush holder. Motors, because the protrusions on the bottom plate of the brush holder can reduce the abnormal sound of the brush, as well as position the brush holder and prevent it from falling off. There is no need to fix the brush holder to the bracket B with rivets. The number of assembling steps can be reduced and the productivity can be improved, and an excellent flat motor with low noise and high reliability can be realized.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a flat motor according to an embodiment of the present invention;

FIG. 2 is a half sectional view of a conventional flat motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commutator 2 Rotor 3 Bracket A 4,14 Bracket B 5 Substantially annular magnet 6 Brush 7,17 Brush holder 8 Rivet 18 Elastic body

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 5/14 H02K 5/24 H02K 13/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A flat rotor formed by disposing a polygonal single coil in a disk shape on a commutator and resin-molding the first commutator, a first bracket opposed to the rotor, and a substantially annular shape on the other. In a flat motor provided with a magnet, a brush that slides on the commutator surface, and a second bracket having a brush holder that holds and fixes the brush, a protrusion is provided on a bottom plate of the brush holder, A flat motor, wherein the brush holder is sandwiched and fixed to the second bracket by the substantially annular magnet via an elastic body integrally formed with the container.