Spindle motor having a fluid dynamic bearing system and a stationary shaft
First Claim
Patent Images
1. A spindle motor having a fluid dynamic bearing system comprising:
- a stationary shaft (12;
212;
312) that is held directly or indirectly in a baseplate (10, 210;
310),a rotor component (14, 114a;
214;
314a-c) rotatably supported with respect to the shaft about a rotational axis (46;
246;
346),a bearing gap (20, 220;
320) open at both ends filled with a bearing fluid that separates the adjoining surfaces of the shaft (12;
212;
312), the rotor component (14, 114a;
214;
214a-c) and at least one first bearing part (16, 216;
316) from one another, a first radial bearing (22a, 222a;
322a) and a second radial bearing (22b, 222b;
322b) formed between the opposing axially extending bearing surfaces of the shaft (12;
212;
312) and the rotor component (14, 114a;
214;
314a-c),an axial bearing (26, 226;
326) formed between the opposing radially extending bearing surfaces of the rotor component (14, 114a;
214;
314a-c) and the first bearing part (16, 216;
316) connected to the baseplate,a recirculation channel (28;
128;
228;
328) filled with bearing fluid that connects the remote regions of the bearing to each other, andan electromagnetic drive system (42, 44;
342, 244) for driving the rotor component, andcharacterized in that the recirculation channel (28, 128;
228) ends in a gap (21) radially outside of the bearing gap (20) of the axial bearing (26), the width of the gap (21) being greater than the width of the bearing gap (20).
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Accused Products
Abstract
The invention relates to a spindle motor having a fluid dynamic bearing system comprising axial and radial bearings that contains a rotor component (14) which encloses a stationary shaft (12), which in turn is connected at both its ends to axially aligned bearing parts (16; 18) that are fashioned such that they form capillary sealing gaps (32; 34), a recirculation channel (28) filled with bearing fluid that connects the remote regions of the bearing to each other, and an electromagnetic drive system (42, 44) for driving the rotor component.
45 Citations
31 Claims
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1. A spindle motor having a fluid dynamic bearing system comprising:
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a stationary shaft (12;
212;
312) that is held directly or indirectly in a baseplate (10, 210;
310),a rotor component (14, 114a;
214;
314a-c) rotatably supported with respect to the shaft about a rotational axis (46;
246;
346),a bearing gap (20, 220;
320) open at both ends filled with a bearing fluid that separates the adjoining surfaces of the shaft (12;
212;
312), the rotor component (14, 114a;
214;
214a-c) and at least one first bearing part (16, 216;
316) from one another, a first radial bearing (22a, 222a;
322a) and a second radial bearing (22b, 222b;
322b) formed between the opposing axially extending bearing surfaces of the shaft (12;
212;
312) and the rotor component (14, 114a;
214;
314a-c),an axial bearing (26, 226;
326) formed between the opposing radially extending bearing surfaces of the rotor component (14, 114a;
214;
314a-c) and the first bearing part (16, 216;
316) connected to the baseplate,a recirculation channel (28;
128;
228;
328) filled with bearing fluid that connects the remote regions of the bearing to each other, andan electromagnetic drive system (42, 44;
342, 244) for driving the rotor component, andcharacterized in that the recirculation channel (28, 128;
228) ends in a gap (21) radially outside of the bearing gap (20) of the axial bearing (26), the width of the gap (21) being greater than the width of the bearing gap (20). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A spindle motor having a fluid dynamic bearing system comprising:
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a stationary shaft (12;
212;
312) that is held directly or indirectly in a baseplate (10, 210;
310),a rotor component (14, 114a;
214;
314a-c) rotatably supported with respect to the shaft about a rotational axis (46;
246;
346),a bearing gap (20, 220;
320) open at both ends filled with a bearing fluid that separates the adjoining surfaces of the shaft (12;
212;
312), the rotor component (14, 114a;
214;
214a-c) and at least one first bearing part (16, 216;
316) from one another, a first radial bearing (22a, 222a;
322a) and a second radial bearing (22b, 222b;
322b) formed between the opposing axially extending bearing surfaces of the shaft (12;
212;
312) and the rotor component (14, 114a;
214;
314a-c),an axial bearing (26, 226;
326) formed between the opposing radially extending bearing surfaces of the rotor component (14, 114a;
214;
314a-c) and the first bearing part (16, 216;
316) connected to the baseplate,a recirculation channel (28;
128;
228;
328) filled with bearing fluid that connects the remote regions of the bearing to each other, andan electromagnetic drive system (42, 44;
342, 244) for driving the rotor component,characterized in that the recirculation channel (28, 128;
228) ends in a gap (21) radially outside of the bearing gap (20) of the axial bearing (26), andfurther characterized in that the width of the gap (21) is greater than or equal to the width of the bearing gap (20) of the axial bearing (26) plus the depth of the bearing patterns of the axial bearing (26).
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23. A spindle motor having a fluid dynamic bearing system comprising:
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a stationary shaft (12;
212;
312) that is held directly or indirectly in a baseplate (10, 210;
310),a rotor component (14, 114a;
214;
314a-c) rotatably supported with respect to the shaft about a rotational axis (46;
246;
346),a bearing gap (20, 220;
320) open at both ends filled with a bearing fluid that separates the adjoining surfaces of the shaft (12;
212;
312), the rotor component (14, 114a;
214;
214a-c) and at least one first bearing part (16, 216;
316) from one another, a first radial bearing (22a, 222a;
322a) and a second radial bearing (22b, 222b;
322b) formed between the opposing axially extending bearing surfaces of the shaft (12;
212;
312) and the rotor component (14, 114a;
214;
314a-c),an axial bearing (26, 226;
326) formed between the opposing radially extending bearing surfaces of the rotor component (14, 114a;
214;
314a-c) and the first bearing part (16, 216;
316) connected to the baseplate,a recirculation channel (28;
128;
228;
328) filled with bearing fluid that connects the remote regions of the bearing to each other, andan electromagnetic drive system (42, 44;
342, 244) for driving the rotor component, anda sealing gap (32;
332) for sealing the bearing gap (20, 220;
320) which is covered by an annular cover (30, 130;
330) connected to the rotor component (14;
114a;
314c) that, together with the second bearing part (18;
318), forms a labyrinth seal (48;
348). - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A hard disk drive comprising a spindle motor for rotatably driving at least a storage disk, and means for writing on and reading data from the storage disk, the spindle motor having a fluid dynamic bearing system and comprising:
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a stationary shaft (12;
212;
312) that is held directly or indirectly in a baseplate (10, 210;
310),a rotor component (14, 114a;
214;
314a-c) rotatably supported with respect to the shaft about a rotational axis (46;
246;
346),bearing gap (20, 220;
320) open at both ends filled with a bearing fluid that separates the adjoining surfaces of the shaft (12;
212;
312), the rotor component (14, 114a;
214;
214a-c) and at least one first bearing part (16, 216;
316) from one another, a first radial bearing (22a, 222a;
322a) and a second radial bearing (22b, 222b;
322b) formed between the opposing axially extending bearing surfaces of the shaft (12;
212;
312) and the rotor component (14, 114a;
214;
314a-c),an axial bearing (26, 226;
326) formed between the opposing radially extending bearing surfaces of the rotor component (14, 114a;
214;
314a-c) and the first bearing part (16, 216;
316) connected to the baseplate,a recirculation channel (28;
128;
228;
328) filled with bearing fluid that connects the remote regions of the bearing to each other, andan electromagnetic drive system (42, 44;
342, 244) for driving the rotor component,characterized in that the recirculation channel (28, 128;
228) ends in a gap (21) radially outside of the bearing gap (20) of the axial bearing (26), andfurther characterized in that the width of the gap (21) is greater than or equal to the width of the bearing gap (20) of the axial bearing (26) plus the depth of the bearing patterns of the axial bearing (26).
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31. A spindle motor having a fluid dynamic bearing system comprising:
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a stationary shaft (12;
212;
312) that is held directly or indirectly in a baseplate (10, 210;
310),a rotor component (14, 114a;
214;
314a-c) rotatably supported with respect to the shaft about a rotational axis (46;
246;
346),a bearing gap (20, 220;
320) open at both ends filled with a bearing fluid that separates the adjoining surfaces of the shaft (12;
212;
312), the rotor component (14, 114a;
214;
214a-c) and at least one first bearing part (16, 216;
316) from one another, a first radial bearing (22a, 222a;
322a) and a second radial bearing (22b, 222b;
322b) formed between the opposing axially extending bearing surfaces of the shaft (12;
212;
312) and the rotor component (14, 114a;
214;
314a-c),an axial bearing (26, 226;
326) formed between the opposing radially extending bearing surfaces of the rotor component (14, 114a;
214;
314a-c) and the first bearing part (16, 216;
316) connected to the baseplate,a recirculation channel (28;
128;
228;
328) filled with bearing fluid that connects the remote regions of the bearing to each other, andan electromagnetic drive system (42, 44;
342, 244) for driving the rotor component,characterized in that the recirculation channel (28, 128;
228) is disposed in the rotor component (14;
114a;
214) and connects a sealing gap (34) radially outside the axial bearing (26) to a section of the bearing gap (20) adjacent to a dynamic pumping seal (136).
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Specification