HUB-INTEGRATED SHAFT, FLUID DYNAMIC PRESSURE BEARING DEVICE INCLUDING SAME, AND SPINDLE MOTOR

摘要

PROBLEM TO BE SOLVED: To improve yield and productivity of a material of a rotor hub assembled in a fluid dynamic pressure bearing device.

SOLUTION: The hub part 3 of a hub-integrated shaft 9 is made of sintered metal. As a result, large quantity of chips is not generated unlike the case of forming the hub part 3 by machining, Thus, yield and productivity of a material of the hub part 3 are improved. The formation of the hub part 3 by the sintered metal achieves finishing with higher size accuracy than forging. Thus, the amount of working by post-working is reduced to improve productivity.

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