To provide a structure securing sufficient durability, even if a reinforcing member 4A is thinned, by reducing amplitude of stress applied to the reinforcing member 4a, and easily reducing weight of an outer ring member 2A including the reinforcing member 4A.
A small diameter side end edge part of the reinforcing member 4A is locked in a locking groove 11 formed in a portion closer to an axially inward of an outer peripheral surface of the outer ring member 2A. Even if a rotating side flange 7A has a tendency to be inclined by moment applied during turning traveling, force is only applied in a compressing direction in the reinforcing member 4A, and force is not applied in a pulling direction. The amplitude of the stress therefore can be reduced.
YUGAWA KINJI
TAKEHARA TORU
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