JPH0548563U - Flat motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a highly reliable flat motor that reduces brush noise, realizes high output and low cost, in a small DC motor used for an air purifier, blower, etc. in a vehicle interior. With the goal. [Structure] A brush holder 6 is attached to a bracket B2 via an elastic body 10, and a brush box 7 installed on the surface of the brush holder on the rotor 3 side is covered with a molded product integrated with the elastic body to reduce noise. It is possible to obtain an excellent flat motor with high output and low cost.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small DC motor, for example, a flat motor used for an air purifier for a vehicle interior or a blower for indoor air blowing.

[0002]

[Prior Art]

 In recent years, flat motors have been used in fan motors for vehicle interiors by taking advantage of their thinness and light weight, and for that reason, low noise and cost reduction are required.

A conventional flat motor will be described below. FIG. 2 is a sectional view of the flat motor. In FIG. 2, 1 is a bracket A, 2 is a bracket B having a magnet 4, 3 is a rotor, 5 is a commutator, 6 is a brush holder, 7 is a brush box, 8 is a brush, and 9 is a brush holder with a rivet. 6 is fixed to the bracket B2 by rivets 9 by crimping.

The operation of the flat motor configured as described above will be described below. First, the brush 8 slides on the surface of the commutator as the motor rotates, but since there is a groove between adjacent commutator pieces, if the end of the brush 8 falls into the groove, the brush 8 in the brush box 7 will fall. Cause chattering. As a result, vibration and noise are generated between the brush 8 and the brush box 7 and between the brush holder 6 to which the brush box 7 is caulked and fixed.

[0005]

[Problems to be solved by the device]

 However, in the above-described conventional configuration, since the brush holder 6 is directly fixed to the bracket B2 by the rivet 9, chattering of the brush 8 and the vibration of the brush holder 6 due to the chattering are directly transmitted to the bracket B2 and the brush sound is transmitted. Had to be heard.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a highly reliable flat motor which realizes reduction of noise, high output, and cost reduction.

[0007]

[Means for Solving the Problems]

 In order to achieve this object, the flat motor of the present invention mounts a brush retainer on the bracket B via an elastic body, and mounts it on the rotor side surface of the brush retainer as a molded product integral with the elastic body. It has a configuration for covering the installed brush box.

[0008]

[Action]

 With this configuration, the brush retainer is completely floated from the bracket B, so that the vibration of the brush retainer is less likely to be transmitted to the bracket B and also covers the brush box, so that the vibration of the rotor side surface of the brush retainer is suppressed. Is also absorbed and the brush noise heard outside the motor is reduced.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a bracket A, 2 is a bracket B having a magnet 4, 3 is a rotor, 5 is a commutator, 6 is a brush holder, 7 is a brush box, 8 is a brush, and 10 is elastic. It is the body.

The operation of the flat motor configured as above will be described. First, as a sound source of the noise heard outside the motor, the brush 8 drops into the groove of the commutator 5 as the motor rotates and causes chattering in the brush box 7, and the brushing by the chattering of the brush 8 holds the brush. There is a sound that vibrates the container 6 and the vibration is transmitted to the bracket A 1 or the bracket B 2 and heard as a brush sound.

Therefore, by attaching the brush holder 6 to the bracket B2 via the elastic body 10, the vibration of the brush holder is not directly transmitted to the bracket, and the brush holder 6 is arranged on the rotor side surface of the brush holder. By covering the brush box 7, it becomes possible to absorb the vibration of the brush box 7 due to chattering of the brush 8 in the brush box 7. Since the elastic body 10 covering the brush box 7 also serves as insulation between the brush box 7 and the magnet 4, the surface area of the magnet can be designed to be larger than in the conventional case, and the effective magnetic flux amount is also increased. Further, the brush holder 6 can be fixed to the bracket B2 via the elastic body 10 at the same time as the step of attaching the magnet 4 to the bracket B2.

As described above, according to this embodiment, the brush holder is held and fixed to the bracket B via the elastic body, and the brush box is covered with the molded body integrated with the elastic body to reduce the brush noise. At the same time, high output and low cost can be realized.

[0014]

[Effect of the device]

 As described above, according to the present invention, the brush sound can be reduced by mounting the brush retainer on the bracket B via the elastic body and covering the brush box with the molded product integrated with the elastic body. Since it also serves as insulation between the magnet and the brush box, it is possible to increase the effective magnetic flux of the magnet, and it is not necessary to fix the brush holder to the bracket B with rivets, which reduces the man-hours and results in low noise and high noise. It is possible to realize an excellent flat motor with low output and low cost.

[Brief description of 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]

 1 bracket A 2 bracket B 3 rotor 4 magnet 5 commutator 6 brush retainer 7 brush box 8 brush 9 rivet 10 elastic body

Claims (1)

[Scope of utility model registration request] 1. A flat rotor comprising a polygonal single coil disposed on a disc and molded with a resin. A first bracket is provided on one side facing the rotor and an annular magnet is provided on the other side. In a flat motor provided with a second bracket having a brush retainer, the brush retainer is attached to the second bracket via an elastic body, and the brush retainer of the brush retainer is formed as an integral body with the elastic body. A flat motor, characterized in that it covers a brush box arranged on the surface on the rotor side.