| 摘要 |
<p>The ball screw 1 includes: a screw shaft 2, on the outer circumferential surface of which a spiral screw groove 2a is formed; a nut, on the inner circumferential surface of which a screw groove 3a opposed to the screw shaft 2 is formed; and a plurality of balls 4 arranged in a rolling element rolling passage 6, which is formed between both the screw grooves 2a, 3a, under the condition that the plurality of balls 4 can be freely rolled. The nut 3 is fixed to a side cap 7 for scooping up the rolling balls 4 at one end of the rolling element rolling passage 6 so that the rolling balls 4 can be sent to the other end.
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