| US 7,524,113 B2 | ||
| Hydrodynamic bearing device | ||
| Tomohiro Haga, Ehime (Japan); and Junichi Nakamura, Ehime (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Aug. 09, 2006, as Appl. No. 11/501,105. | ||
| Claims priority of application No. 2005-280315 (JP), filed on Sep. 27, 2005. | ||
| Prior Publication US 2007/0071378 A1, Mar. 29, 2007 | ||
| Int. Cl. F16C 32/06 (2006.01) | ||
| U.S. Cl. 384—123 | 8 Claims |
| 1. A hydrodynamic bearing device, comprising:
a shaft which serves as a rotational axis;
a sleeve having a radial bearing portion formed on an inner peripheral surface which opposes an outer peripheral surface of
the shaft;
a flange integrated near one end of the shaft;
a thrust bearing portion which is formed between a surface of the flange, which is cross to a rotational axis direction, and
a surface which opposes the surface of the flange which is cross to the rotational axis direction; and
a plurality of thrust dynamic pressure generating grooves formed on either the surface of the flange which is cross to a rotational
axis direction or a surface opposing thereto, which forms the thrust bearing portion, the grooves being connected to each
other across the entire surface, and having a groove depth which becomes greater from the inner periphery toward the outer
periphery with the rotational axis being a center.
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