| 摘要 |
A rotating tool includes a drive source, a work piece, and a traction drive unit intercoupled between the drive source and work piece. The traction drive unit includes a unit case having a through-hole, a drive shaft and a follower shaft inserted into the through-hole and supported via a rolling bearing, and a plurality of planet rollers installed between the rolling bearing and the drive shaft in a frictionally rotatable condition and supported at the side of the follower shaft.
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