Small brushless motor

Abstract

A brushless motor includes a highly reliable thrust-receiving member that simplifies the machining and assembling of parts and prevents deformation of the bearing and leakage of lubricating oil. A stator base has a cylindrical portion serving as a base portion of a bearing housing of the motor. The cylindrical portion is integral with the stator base. A sleeve bearing is pressed in and mounted in a fixed condition on the inner side of the cylindrical portion. A stator core consisting of a conductive wire is mounted in a fixed condition on the outer side of the cylindrical portion, thereby forming a stator. A thrust-receiving portion for the rotary shaft is molded integrally with the stator base at the opening of the cylindrical portion by outsert and resin integral molding, this thrust-receiving portion serving to receive the end of the rotary shaft opposite to the output end thereof.

Description

technical field [0001] The present invention relates to a small brushless motor for a recording and reproducing device using, for example, a disk medium. Background technique [0002] In the prior art, in a bearing bracket structure supporting a bearing component of a small brushless motor, at the approximate center of a stator base made of a thin plate of an iron-based metal material such as an iron plate or a non-ferrous metal material such as aluminum, The inner edge burring is performed, and the bearing bracket part is integrally formed with the stator base using the same material as the stator base. [0003] In the structure of such a bearing bracket, it is necessary to use a thrust receiving part made of a material different from that of the stator base to close the inner flange base into a bottomed shape, and the thrust receiving part supports the stator base. The motor rotates the opposite end of the shaft to the load side, and is kept so that the lubricating oil of...

AI Technical Summary

Problems solved by technology

In addition, the processing of the threaded part and the workability of screw fastening are poor, and there is a risk of lubricant leakage from the joints.

[0017] In 2), there is a risk that the metal ring part will fall off or be misplaced (external れ). In addition, there is a risk of dimensional deviation in the thrust direction, and there is a risk that the rotor will come into contact with the bearing part and cannot rotate.

[0018] In 3), since it is directly riveted to the end of the bearing, there is a risk of deformation such as the inner diameter of the bearing, a risk of loosening or misalignment of the riveted part, and a risk of lubricant leakage.

[0019] In 4), the workability of welding and bonding is poor, and there is a risk of lubricant leakage due to peeling or air bubbles at the welded part and bonded part

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