| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a dynamic pressure generating groove for providing a dynamic pressure bearing to set a gap between a shaft member as an integrated body of a shaft with a flange part and an inner circumferential surface of a sleeve in a desired state after formation of the dynamic pressure generating groove even when there is residual internal stress in a case where drawn material is used. SOLUTION: The dynamic generating groove is formed by plastic work in the surface of a flange part of the dynamic pressure bearing composed of the shaft member 1 comprising a shaft part 2 and a flange part 3, and a sleeve having a gap to the shaft part 2 and the flange part 3 for the shaft member 1 to be engaged. The shaft member 1 is formed by lathing of drawn material of which drawn direction is known. The shaft member is taken correctly as sized, the dynamic pressure generating groove is formed in the surface of the flange part, perpendicular distance from an outer circumferential end part of the flange part to the shaft part is measured, an obtained value is fed back to take the shaft member from the drawn material, and plastic work is performed to the flange part. COPYRIGHT: (C)2005,JPO&NCIPI
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