| 摘要 |
PROBLEM TO BE SOLVED: To uniform contact stress of inner and outer rings of an intermediate member in the axial direction by forming an inner ring outer peripheral surface in a cross-sectional shape dimensions in the diametrical direction of which become gradually smaller toward both sides in the axial direction and an outer ring inner peripheral surface in a cross-sectional shape dimensions of which become gradually larger. SOLUTION: As steel balls of a single row bearing are arranged on a single flat surface orthogonal with a rotation axis of inner and outer rings 1, 2, the outer ring 2 is easy to incline against a central line of the inner ring 1, and contact stress with the inner and outer rings 1, 2 generated on a sprag 5 extremely becomes large on both end parts in the axial direction. Consequently, a large load is applied on an edge of the sprag 5, peeling, abrasion, or the like easily occurs, and proper oscillation of the sprag 5 can be spoiled. An outer peripheral surface 1a of the inner ring 1 is formed in a cross-section circular arc shape dimensions in the radial direction of which gradually become smaller toward both sides in the axial direction, and an inner peripheral surface 2a of the outer ring 2 is formed in a cross-section circular arc shape dimensions in the radial direction of which gradually become larger toward the both sides in the axial direction. Consequently, contact stress of the inner and outer rings 1, 2 of each of the sprags 5 is uniformed in the axial direction as typically shown.
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