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Motor

A motor and bearing technology, applied in the field of motors, can solve the problems of increased motor rotational noise and vibration, torque loss, and impact on bearing cylindricity. effect of loss

Active Publication Date: 2012-05-23
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as mentioned above, the bearing is formed by injection molding of resin, so in the molding process, when the molding material is cooled and solidified, deformation (shrinkage (Japanese: ヒケ)) caused by shrinkage of the molding material may sometimes occur. Wait
In particular, if it is an inexpensive resin material, the resulting shrinkage becomes large, which seriously affects the cylindricity of the bearing
As a result, when such a contracted bearing is mounted on a bearing holder, the gap between the bearing and the through hole of the bearing holder increases, resulting in torque loss, noise during motor rotation, and The problem of increased vibration

Method used

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Embodiment Construction

[0035] Embodiments of the motor of the present invention will be described in detail below with reference to the drawings.

[0036] First, use figure 1 and figure 2 The overall structure of the motor 10 of this embodiment will be described. figure 1 (a) is a side view (partial sectional view) in the longitudinal direction of the motor 10 of this embodiment, figure 1 (b) is a side view of the motor 10 in the width direction. figure 2 It is an enlarged view for explaining the main part of this embodiment figure 1 Sectional view of the part enclosed by the dashed line in (a).

[0037] The motor 10 of the present embodiment includes: a stator 20; a rotor 24 having a rotor magnet fixed on the rotating shaft 23; a bracket 41 fixed on the stator 20; a first bearing 25 for rotatably supporting the rotating shaft 23, a second a second bearing 31; and a bearing holder 32 holding the second bearing 31.

[0038] The stator 20 includes a pair of stator core sets 29, 30. The stator ...

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Abstract

The invention provides a motor which can improve proper alignment of a rotating shaft and a bearing of the motor via improving cylinder degree of the bearing, and can greatly reduce torque losses, noise and vibration in motor driving. The motor (10) comprises: a rotator (24) provided with the rotor shaft (23), a stator (20) arranged on periphery of the rotator (24), a second bearing (31) which isformed by resin material and is provided with a supporting rabbet (33b) for rotatablely supporting a shaft of the rotor shaft (23), and a bearing holder (32) provided with a bearing hole (32a) which is supplied for a second bearing (31) to insert to. The second bearing (31) is kept in the bearing hole (32a) and forms a groove (33c) in a shape of surrounding the supporting rabbet (33b).

Description

technical field [0001] The present invention relates to a motor, and more particularly to a motor having a bearing formed by injection molding that supports the shaft end of a rotating shaft. Background technique [0002] Conventionally, there is known a motor used in digital cameras and the like, in which a screw is formed on the rotation shaft (for example, refer to Patent Document 1). [0003] As shown in Patent Document 1, in this type of motor, both ends of the rotating shaft are supported on bearings via balls. Among them, the bearing that supports the shaft end of the rotating shaft on the rotor side is a cylindrical member made of resin. The force applying part) exerts force in the direction of the rotor. In addition, a concave portion (bearing portion) is formed on an end surface of the bearing on the rotating shaft side, and the ball is fitted into the concave portion. [0004] Here, the bearing is designed to be held in the through hole of the bearing holder wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K5/167
CPCH02K7/081H02K7/06F16C17/08H02K5/1732F16C2380/27
Inventor 岩岛伸悟宫下武芳
Owner SANKYO SEIKI MFG CO LTD