| 摘要 |
PROBLEM TO BE SOLVED: To use free cutting stainless steel which is easy of cutting work as bearing material of a dynamic pressure bearing, form trenches in the bearing material by electromechanical machining, and obtain a superior bearing surface free from protrusions of cutting component. SOLUTION: Dynamic pressure trenches are formed on one out of a fixed bearing surface formed on a fixed member side and a rotary bearing surface formed on a rotating member side or on both of them, and the dynamic pressure bearing is constituted. The rotating member is supported rotatably to the fixed member by the dynamic pressure bearing. One or both of the fixed bearing surface and the rotary bearing surface are constituted of the free cutting stainless steal. The dynamic pressure trenches are formed by performing electromechanicai machining to the stainless steel, and acid treatment is performed to the forming surface of the trenches.
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