Axially sliding connection brush appliance, its mfg. method and dynamo set with same brush

Abstract

The object of this invention is to prevent damage to the vibration damping property of a brush even for a violent vibration, and to enable frequently a stale contact between the brush and a commutator. The brush (5) is disposed at an elevation angle less than 45 degrees relative to a brush base (4) fixed to a bracket (3) such that the free end thereof is connected slidably to a flat commutator. The flat portion (5a) of the base portion of the brush is fixed to the exposed portion (4b) of the pattern (4a) of the brush base 4 by soldering. The base portion of the brush is coated with ultraviolet curable acrylic-based resin (6) to cover, at a maximum, about 1 / 3 of the projection length of the side face from the base portion to the brush arm portion of the brush.

Description

technical field [0001] The present invention relates to an improvement of an axial sliding connection type brush device of a flat motor used in a calling mechanism of a mobile communication device and the like; more particularly, the present invention relates to enabling the above-mentioned The vibration-damping properties of the flat vibration motor brushes are improved, and the contact between them and the commutator can be stabilized. Background technique [0002] In recent years, mobile communication technology has been increasingly developed, and efforts to reduce the weight and thickness of mobile communication devices are being accelerated. Correspondingly, as the vibration motor of the calling mechanism, a small flat type vibration motor is mostly used. [0003] Generally, the structure of the above-mentioned small flat vibration motor is centered on the rotating shaft, and a flat rotor fastened to a flat commutator, a flat stator magnet, an axial sliding connection...

AI Technical Summary

Problems solved by technology

[0004] However, in the flat vibration motor with the above structure, the vibration generated by the rotation of the rotor is transmitted to the brush at the same time, making the contact state between it and the commutator unstable, and sparks are generated at the contact point, thereby The generation of harmful substances that cause electrical disturbances on the contact portion, or the reduction of the contact pressure that deteriorates the brush elastic body itself, significantly reduces the performance of the motor, and in the worst case does not cause starting.

[0005] Hitherto, the absorbing of the vibration transmitted to the brush is to use the method of pasting the damper member on the brush arm portion of the brush, but in the small flat type vibration motor having the above-mentioned structure, Due to the extremely small shape, there is no space to paste the damper components, making the work too complicated

In particular, the size of the brush damper component corresponding to the violent vibration of the vibration motor is large, so there is a problem that it must be manufactured with high precision, and the damper cannot be easily attached to the brush.

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