JPH059174U - motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the abrasion powder of the brush from entering the inside of the bearing that supports the shaft of the motor and causing the sliding failure. [Structure] The shaft 8 of the motor is rotatably supported at both ends by bearings 6 arranged in the body 4. The commutator 10 is attached near one bearing of the shaft, and is in sliding contact with the brush 14 fixed to the body side. The shield plate 20 is fixed to a portion of the shaft between the bearing and the commutator to prevent brush abrasion powder from entering the inside of the bearing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor.

[0002]

[Prior Art]

 FIG. 3 is a vertical cross-sectional view of a conventional motor, in which a shaft 110 is rotatably supported by bearings 106 and 108 held in two bodies 102 and 104 that hold an intermediate body 100 from both sides. A rotor 112 is attached to the center of the shaft 110 and faces a permanent magnet 114 on the intermediate body 100 side. Further, a commutator 116 is attached to one end of the shaft 110 close to the bearing 108, and is in sliding contact with a brush 118 fixed to the body 104.

[0003]

[Problems to be solved by the device]

 In the above conventional configuration, since one bearing 108 and the commutator 116 are close to each other, the abrasion powder of the brush 118 easily enters the inside of the bearing 108, which causes a problem such as a sliding failure of the bearing 108. It was

The present invention has been made to eliminate the above problems, and provides a motor in which abrasion powder of a brush does not enter the bearing.

[0005]

[Means for Solving the Problems]

 The motor according to the present invention comprises a shaft rotatably supported by bearings, a commutator attached to the shaft, and a brush arranged to face the commutator. Further, the motor is provided between the bearing and the commutator. A shield plate is provided to prevent brush abrasion powder from entering the bearing.

[0006]

With the motor according to the present invention, since the brush abrasion powder does not enter the bearing side due to the shield plate, there is no risk of sliding failure or the like.

[0007]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a sectional view of an essential part of a motor according to an embodiment of the present invention. Bearings 6 are respectively held in two bodies 4 (one of which is not shown) that holds the intermediate body 2, and a shaft 8 is rotatably supported between the two bearings 6.

A commutator 10 is attached near the end of the shaft 8 and rotates integrally. On the other hand, a brush 14 is fixed to the body 4 side via a brush retainer 12, and the commutator 10 is in sliding contact with the brush 14. Further, 16 is a plus side terminal and 18 is a minus side terminal.

A shield plate 20 is interposed between the bearing 6 and the commutator 10. The shield plate 20 is press-fitted and fixed to the shaft 8 and integrally rotates. A cylindrical flange 20a is formed on the shield plate 20 on the commutator 10 side, and faces the space between the brush 14 and the commutator 10. Further, an annular recess 20b is provided on the end face on the bearing 6 side, and a cylindrical projection 4a formed in a portion of the body 4 holding the bearing 6 forms a gap in the recess 20b. It fits in separately.

In the motor having the above structure, the shield plate 20 is disposed between the bearing 6 and the commutator 10, and the shield plate 20 is provided with the flange 20 a, and the body 6 is provided in the recess 20 b of the shield plate 20. Since the bearing 6 side and the commutator 10 side are shielded by fitting the cylindrical protrusion 4a, the abrasion powder of the brush 14 does not enter the bearing 6, and the sliding failure of the bearing 6 occurs. It is possible to prevent the occurrence of

FIG. 2 is a diagram showing a second embodiment. The same parts as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described. In this embodiment, an air hole 20c penetrating from the outer surface of the shield plate 20 to the commutator 10 side is formed, and further, a blade 20d is provided on the inner surface of the tubular flange 20a of the shield plate 20.

In this motor, when the shield plate 20 rotates along with the rotation of the shaft 8, air is passed from the outside of the air hole 20c to the inside by the action of the blade 20d, and the contact portion between the commutator 10 and the brush 14 is cooled. It is possible to remove the abrasion powder of the brush 14 while performing the above. In conventional motors, there was a problem that the bearing grease melts due to the heat generated by the commutator, causing bearing failure, and the melted grease adheres to the commutator and the surface of the commutator tends to become rough. In the embodiment, such a problem can be eliminated.

[0013]

[Effect of the device]

 As described above, according to the present invention, by providing the shield plate between the bearing supporting the shaft and the commutator, it is possible to prevent brush abrasion powder from entering the bearing and causing sliding failure. be able to.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a main part of a motor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of the second embodiment.

FIG. 3 is a vertical sectional view of a conventional motor.

[Explanation of symbols]

 6 bearing 8 shaft 10 commutator 14 brush 20 shield plate

Claims (1)

Claims for utility model registration: 1. A motor comprising a shaft rotatably supported by a bearing, a commutator attached to the shaft, and a brush arranged to face the commutator. A motor provided with a shield plate for preventing brush abrasion powder from entering the bearing between the commutator and the commutator.