Spindle-drive motor with bushing

• US 5,977,675 A
• Filed: 08/03/1998
• Issued: 11/02/1999
• Est. Priority Date: 08/02/1997
• Status: Expired due to Fees

• Current Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Original Assignee: Precision Motors Deutsche Minebea GmbH
• Inventors: Oelsch, Juergen
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Ghahramani, Saeed
• Application Number:
  US09/128,365
• Time in Patent Office: 456 Days
• Field of Search: 310/67 R, 310/90, 310/91, 310/88, 348/276, 360/98.07, 360/99.04, 360/99.08, 384/477, 384/480
• US Class Current: 310/90
• CPC Class Codes: F16C 2370/12 Hard disk drives or the like
• CPC Class Codes: F16C 35/077 between housing and outer race ring
• CPC Class Codes: G11B 19/2009 Turntables, hubs and motors for disk drives; Mounting of motors in the drive means for clamping of disk to turntable G11B17/022 and subgroups
• CPC Class Codes: H02K 5/1737 radially supporting the rotor around a fixed spindle; radially supporting the rotor directly

Abstract

A spindle-drive motor, especially for driving a hard drive, with a stator, a rotor, an axle between them having at least one bearing, and a drive, where the rotor or stator is provided with a bushing which accommodates at least one bearing. The bushing and bearing together form a sealing gap which seals the rotor and the stator with respect to each other.

Claims

1. A spindle-drive motor, especially for driving a hard drive, with a stator, a rotor, a stationary axle in between, and a drive, said motor comprising:

a bearing; and

a bushing which accommodates said bearing, said bushing being selectively mounted in the rotor or the stator;

said bushing together with said bearing forms a sealing gap which seals the rotor and the stator with respect to one another.

2. The spindle-drive motor according to claim 1, wherein said bearing comprises two bearing elements spaced a distance apart by means of a spacer ring.

3. The spindle-drive motor according to claim 1 or 2, wherein said bushing is designed essentially in a cup shape.

4. The spindle-drive motor according to claim 3, wherein said bushing is provided with a flange which extends in the longitudinal direction of said bushing.

5. The spindle-drive motor according to claim 3, wherein said bushing is formed as a labyrinth gland with respect to the axle.

6. The spindle-drive motor according to claim 3, wherein said bushing is made of a plastic material.

7. The spindle-drive motor according to claim 3, wherein said bushing is shaped and configured to have a vibration damping effect.

8. The spindle-drive motor according to claim 1 or 2, wherein said the bushing is provided with a flange which extends in the longitudinal direction of said bushing.

9. The spindle-drive motor according to claim 8, wherein said bushing is formed as a labyrinth gland with respect to the axle.

10. The spindle-drive motor according to claim 8, wherein said bushing is made of a plastic material.

11. The spindle-drive motor according to claim 8, wherein said bushing is shaped and configured to have a vibration damping effect.

12. The spindle-drive motor according to claim 1 or 2, wherein said bushing is formed as a labyrinth gland with respect to the axle.

13. The spindle-drive motor according to claim 12, wherein said busing is made of a plastic material.

14. The spindle-drive motor according to claim 12, wherein said bushing is shaped and configured to have a vibration damping effect.

15. The spindle-drive motor according to claim 1 or 2, wherein said bushing is made of a plastic material.

16. The spindle-drive motor according to claim 15, wherein said bushing is shaped and configured to have a vibration damping effect.

17. The spindle-drive motor according to claim 1 or 2, wherein said bushing is shaped and configured to have a vibration damping effect.