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特許 権利維持 PROBLEM TO BE SOLVED: To provide a traction drive with an elastic ring having improved fatigue strength, and to provide its surface treatment method. ; SOLUTION: The traction drive 1 comprises a plurality of planetary rollers 7 arranged neighboring one anther around the outer peripheral face of a sun roller 5, and the elastic ring 9 neighboring the planetary rollers 7 for embracing the planetary rollers 7 while thrusting them.
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