Spindle motor with disk clamp centered on cover cap

Patent metadata

Field	Value
Publication number	US-9646645-B2
Application number	US-201514959098-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Dec 5, 2014
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

The invention relates to the spindle motor for driving a hard disk drive, comprising: a stationary motor component ( 10, 12, 16, 18 ), a rotary motor component ( 14 ) rotatably mounted relative to the stationary motor component using a fluid dynamic bearing system, a bearing gap ( 20 ) disposed between the stationary motor component and the rotary motor component and filled with a bearing fluid, having at least one open end, at least one sealing gap ( 34 ) for sealing the open end, at least one cover cap ( 30 ) for covering the sealing gap, which is secured to the rotatable motor component, a disk clamp ( 44 ) for attachment of at least one magnetic storage disk ( 48 ) on the rotatable motor member and an electromagnetic drive system ( 40, 42 ) to drive the rotatable motor member. The disk clamp ( 44, 156 ) is centered on a peripheral surface of the cover cap ( 30, 118 ).

First claim

The invention claimed is:

1. A spindle motor for driving a hard disk drive, comprising: a stationary motor component ( 10 , 12 , 16 , 18 , 110 , 112 , 114 , 126 ), a rotatable motor component ( 14 , 116 , 128 , 140 ) which is rotatably supported relative to the stationary motor component by means of a fluid dynamic bearing system, a bearing gap ( 20 , 120 , 132 ) between the fixed motor component ( 10 , 12 , 16 , 18 , 110 , 112 , 114 , 126 ) and the rotatable motor component ( 14 , 116 , 128 , 140 ) is disposed and filled with a bearing fluid, having at least one open end, at least one sealing gap ( 34 , 122 , 134 ) for sealing the open end of the bearing gap ( 20 , 120 , 132 ), at least one cap ( 30 , 118 ) to cover the sealing gap ( 34 , 122 , 134 ), the cap being fixed on the rotatable motor component ( 14 , 116 , 128 ) is fixed, a disk clamp ( 44 , 156 ) for fixing at least one magnetic storage disk ( 48 , 148 ) on the rotatable motor component ( 14 , 140 ), an electromagnetic drive system ( 40 , 42 , 142 , 144 ) to drive the rotatable motor component ( 14 , 116 , 128 , 140 ), characterized in, that the disk clamp ( 44 , 156 ) abuts on and is centered on a radially facing peripheral surface of the cover cap ( 30 , 118 ).

2. A spindle motor according to claim 1 , characterized in that the disk clamp ( 44 , 156 ), having an inner peripheral surface ( 44 a , 156 a ), is centered on an outer peripheral surface ( 30 a , 118 a ) of the cover cap ( 30 , 118 ).

3. A spindle motor according to claim 1 , characterized in that the disk clamp ( 44 , 156 ) is fixed with the rotatable motor component ( 14 , 140 ) by means of screw connections.

4. A spindle motor according to claim 1 , characterized in that the cover cap ( 30 ) is designed as a machined turned part.

5. A spindle motor according to claim 1 , characterized in that the bearing gap ( 120 , 132 ) has at least two open ends with sealing arrangements ( 122 , 134 ) which are covered by a first and second cover cap ( 118 , 130 ) respectively, where the disk clamp ( 156 ) is centered on the first cap ( 118 ) and the second cap ( 130 ) differs in shape from the first cap.

6. A spindle motor according to claim 5 , characterized in that the first cap ( 118 ) is designed as a machined turned part.

7. A spindle motor according to claim 5 , characterized in that the second cap ( 130 ) is designed as a stamping or pressing part.

8. A spindle motor according to claim 1 , characterized in that the fluid dynamic bearing comprises at least two fluid dynamic radial bearings ( 22 a , 22 b ) and at least one fluid dynamic thrust bearing ( 26 , 54 ).

9. A spindle motor according to claim 1 , characterized in that the fluid dynamic bearing comprises two oppositely acting fluid dynamic bearings with conical bearing surfaces.

10. A hard disk drive with a spindle motor according to claim 1 .

Assignees

• Minebea Co Ltd

Inventors

• Kirchmeier Tobias

Classifications

• G11B19/2036 Primary

  Motors characterized by fluid-dynamic bearings · CPC title

• H02K7/086

  radially supporting the rotor around a fixed spindle; radially supporting the rotor directly (H02K7/09 takes precedence) · CPC title

• G11B17/038

  Centering or locking of a plurality of discs in a single cartridge · CPC title

• G11B19/209

  in multiple disk arrays, e.g. spindle synchronisation in RAID systems · CPC title

• G11B17/0287

  by permanent connections, e.g. screws, rivets · CPC title