Abstract
This paper describes about a planetary roller type traction drive for high speed motor, which features a new self-loading mechanism to achieve bi-directional drive and high partial load efficiency. The ring roller is elastically and polygonally deformed along contact points, and the circumferential length thereof changes with the arrangement of pinion rollers. In case of four pinions type, the ring roller deforms from square to rectangular when two opposite pinion rollers rotate in the circumferential direction. Since the circumferential length of the rectangular is shorter than that of the square, the contact force can be decreased. When two opposite pinion rollers rotate 20 degrees, the contact force can be changed 45%. The test results prove that the partial load efficiency can be improved comparing with the constant loading mechanism.
