| 摘要 |
PURPOSE:To enable a dynamic pressure bearing to make reciprocal rotation by providing wedged grooves on a shaft part in its peripheral surface direction, and alternately changing their directions along an axial direction. CONSTITUTION:Grooves 3 are provided along the peripheral surface of a shaft part 1. The grooves have the shape of a right-angled triangle, whose vertical side is set in the radial direction of the shaft part, and whose base is set approximately perpendicular thereto and opposing each other between adjacent peripheral bands. In the case of normal rotation, the groove parts (a) engraved in the direction indicated in (A) is actuated to push working fluid. In the case of inverse rotation, the groove parts (b) is actuated inversely to push the working fluid in the direction shown by the arrow. Thus, the bearing can rotate reciprocally.
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