| 摘要 |
PURPOSE:To lengthen the service life of an outer ring raceway track N while suppressing an increase in rotational torque. CONSTITUTION:An inner ring raceway track 18 is provided on the axial single face of a power roller 8 equivalent to an inner ring, and an outer ring raceway track 19a is provided on the axial single face of an outer ring 17a. Plural balls 16, 16 are provided in the rollable state between the inner ring raceway track 18 and the outer ring raceway track 19a. The radius-of-curvature r19a of the cross section of the outer ring raceway track 19a is made smaller than the radius-of-curvature r18 of the inner ring raceway track 18. |
