Spindle motor with disk clamp centered on cover cap
View Patent ↗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 ).
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 .