| 摘要 |
PROBLEM TO BE SOLVED: To attain miniaturization with a small number of parts. SOLUTION: A tunnel-like circulating hole 29 is formed within the wall thickness of a nut 25 to circulate balls 27 between one end 24a and the other end 24b of a ball rolling groove 24 of the nut 25. A plurality of balls 27 rolling in a raceway track 26 formed by the ball rolling grooves 23, 24 of a screw shaft 22 and the nut 25 in a facing manner are guided by a guide part 40 provided at the end of the ball rolling groove 24 of the nut 25 and fed into the circulating hole 29. COPYRIGHT: (C)2007,JPO&INPIT
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