| 摘要 |
A speed changing-apparatus has a first outer roller (10) having a first groove (12A), with a first repeated number, in the circumferential direction in the outer periphery of a first shaft body with a circular cross section; a second outer roller (20) having a second groove (22A), with a second repeated number that is different from the first repeated number, in the circumferential direction in the outer periphery of a second shaft body with a circular cross section; and a hollow cylinder-like inner roller (30) having, in an inner diameter face, grooves (30A) extending in the axial direction with circumferential spacing. The first outer roller (10) and the second outer roller (20) are both opposite an inner roller (30), with balls (32) positioned in the first groove (12A) and balls (32) positioned in the second groove (22A) in between.
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