| 摘要 |
PROBLEM TO BE SOLVED: To suppress the wear of a thrust bearing portion of this kind of dynamic pressure bearing device. SOLUTION: Pressure is generated in a thrust bearing gap C between a thrust bearing face 8b1 having a dynamic pressure groove and a thrust receiving face 2c opposed thereto by the dynamic pressure operation of lubricating oil, to support a shaft member 2 in no contact in the thrusting direction. The thrust receiving face 2c is a flat face, while the thrust bearing face 8b1 has an inclined face 11 and a reduced portion 10 whose axial width is gradually getting smaller as going to the outer diameter side, in the thrust bearing gap C. COPYRIGHT: (C)2006,JPO&NCIPI
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