| 摘要 |
A ball screw has a screw shaft including a ball thread groove formed on an outer peripheral surface thereof, a nut including a ball thread groove formed on an inner peripheral surface thereof, the inner peripheral surface being opposed to the outer peripheral surface of the screw shaft, and a side cap mount surface being formed in the outer peripheral surface of the nut, a plurality of balls disposed between the thread groove of the nut and the thread groove of the screw shaft; and, a side cap fastened to the side cap mount surface and including a ball scooping part and a ball return path for scooping up the balls from one side and returning the balls to another side.
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