Bearing assembly, motor and fan having the same

Abstract

A bearing assembly is disclosed to address the problem of oil leakage in conventional bearing assemblies. The assembly comprises: a shaft tube having a closed end and an open end opposite to each other; the shaft tube having a connected straight segment and a reduced-diameter segment from the closed end to the open end; a bearing having a shaft bore penetrating two end faces of the bearing; a side circumferential surface between the two end faces; the side circumferential surface being radially opposite to the straight segment; and an inner surface of the reduced-diameter segment abutting between the end face of the bearing and the side circumferential surface; and a rotating shaft rotatably passing through the shaft bore of the bearing. The invention also relates to a motor and fan incorporating this bearing assembly. This achieves the effect of preventing oil leakage.

Claims

1. A bearing assembly comprising: a shaft tube having a closed end and an open end opposite to each other, the shaft tube having a straight line segment and a reduced diameter segment connected from the closed end to the open end, the reduced diameter segment connecting to the open end; a bearing having a shaft hole penetrating two end faces of the bearing, a side circumferential surface between the two end faces, the side circumferential surface being radially opposite to the straight line segment, the reduced diameter segment being thermoformed and inclined toward the axis of the shaft tube, such that an inner surface of the reduced diameter segment abuts against the end face of the bearing and the side circumferential surface; and a rotating shaft rotatably disposed in the shaft hole of the bearing.

2. The bearing assembly as requested in item 1, wherein, The tube has a first wall thickness in the reduced diameter section and a second wall thickness in the straight section, the first wall thickness being less than the second wall thickness.

3. The bearing assembly as described in claim 2, wherein, The wall thickness of the tube gradually decreases as the diameter reduction section forms.

4. The bearing assembly as described in claim 2, wherein, The wall thickness of the shaft tube is formed by the step difference between the straight section and the reduced diameter section.

5. The bearing assembly as requested in item 1, wherein, The wall thickness of the narrowed section is equal to the wall thickness of the straight section.

6. A bearing assembly comprising: a shaft tube having a closed end and an open end opposite to each other, the shaft tube having a straight line segment connected to the closed end and a reduced diameter segment from the open end to the closed end, the reduced diameter segment being connected to the open end; a bearing having a shaft hole penetrating two end faces of the bearing, a side circumferential surface between the two end faces, the side circumferential surface being radially opposite to the straight line segment, each end face being connected to the side circumferential surface of the bearing and the shaft hole respectively by two guide inclined surfaces, an inner surface of the reduced diameter segment abutting between the end face and the guide inclined surface, the inner surface of the reduced diameter segment forming an acute angle with the guide inclined surface connecting the side circumferential surface, the guide inclined surface of the bearing connected to the shaft hole forming an acute angle with the rotating shaft; and a rotating shaft rotatably passing through the shaft hole of the bearing.

7. The bearing assembly as requested in item 1, wherein, The inner surface and the end face have an included angle, which is 10° to 40°.

8. The bearing assembly as requested in item 1, wherein, The portion of the inner surface facing the end face is covered with an oil-repellent agent.

9. A bearing assembly comprising: a shaft tube having a closed end and an open end opposite to each other, the shaft tube having a straight line segment connected to the closed end and a reduced diameter segment from the open end to the closed end, the reduced diameter segment connecting to the open end; a bearing having a shaft hole penetrating two end faces of the bearing, a side circumferential surface between the two end faces, the side circumferential surface being radially opposite to the straight line segment, an inner surface of the reduced diameter segment abutting between the end face of the bearing and the side circumferential surface; and a rotating shaft rotatably disposed in the shaft hole of the bearing, the rotating shaft having an annular recess radially opposite to the reduced diameter segment.

10. The bearing assembly as requested in item 9, wherein, The annular depression is covered with an oil-removing agent.

11. The bearing assembly as requested in item 9, wherein, The annular recess is not lower than the end face of the bearing in the axial direction.

12. The bearing assembly as requested in item 9, wherein, One axial dimension of the annular recess is greater than the wall thickness of the narrowed section.

13. The bearing assembly as requested in item 9, wherein, The radial depth of the annular recess is 1 / 8 to 1 / 4 of the outer diameter of the shaft.

14. A motor comprising: a bearing assembly as claimed in any one of claims 1 to 13, the shaft being coupled to a hub; and a stator located on the outer periphery of the shaft tube, the stator driving the hub to rotate.

15. A fan comprising: a fan frame having a motor as claimed in claim 14; and a fan wheel having a hub and a plurality of fan blades disposed around the hub.

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