| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball screw of a shaft circulating type and a ball incorporating method of the ball screw, capable of easily assembling a ball, without requiring manhours. Ž<P>SOLUTION: This ball screw of the shaft circulating type is provided for constituting a plurality of ball circulating rows 21 and 22 for returning to the upstream side, by getting over a land part 17 of a nut 11, by sinking a downstream ball 12 of a screw groove in the inner diameter side by ball circulating grooves 15 and 16, by arranging a plurality of ball circulating grooves 15 and 16 of individually setting a plurality of screw grooves 13a and 13b as a closed loop, in the land part existing between the screw grooves 13a and 13b adjacent in the axial direction of a screw shaft 13, and is characterized in that the screw shaft 13 is a hollow structure, and bypass holes 18 and 19 for incorporating the ball 12 of the ball circulating rows 21 and 22 from the inner diameter side of the screw shaft 13, are arranged in a ball circulating groove part of the screw shaft 13. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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