| 摘要 |
Both an end surface of a first rib, over which a first cylindrical rollers slide, and an end surface of a second rib, over which the first cylindrical rollers slide, slope to approach the perpendicular bisector plane of a first cylindrical raceway surface of an outer ring or slope to be spaced away from the perpendicular bisector plane as it goes outward in a radial direction in a cross section of the outer ring taken in an axial direction. A first sliding contact portion of each first cylindrical roller, which is in sliding contact with the end surface of the first rib, and a second sliding contact portion of each first cylindrical roller, which is in sliding contact with the end surface of the second rib, both are located inward in the radial direction with respect to an orbital cylindrical plane of the first cylindrical rollers.
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