| 摘要 |
PROBLEM TO BE SOLVED: To provide a sintered metal bearing capable of exhibiting necessary bearing rigidity by preventing occurrence of negative pressure in a bearing internal space, while downsizing a fluid dynamic pressure bearing device.SOLUTION: In a sintered metal bearing 8 that is a porous material formed by sintering raw material powder having been subjected to compression molding, and is provided with a dynamic pressure generation part on an inner peripheral surface 8a, dynamic pressure groove array areas A1, A2 in which plural dynamic grooves 8a1 inclined to a circumferential direction are arranged are consecutively formed in an axial direction, as the dynamic pressure generation part; an axial dimension L is 6 mm or less; and a density ratio is 80% or more and 95% or less. |
