| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a needle roller is inclined along an inclined face and thereby a retaining state of the needle roller is unstable when an annular press portion is pressed out of a through-hole, because of a large difference between the rigidity of one side and that of the other side of the annular press portion. SOLUTION: A press face 6a of the annular press portion 6 has arcs formed so that they are projected to the outside in a diameter direction and they are symmetrical to each other at a center of symmetry C in an axial direction of the annular press portion 6. Therefore, one side and the other side of the center of symmetry C in the axial direction of the annular press portion 6 are equal in rigidity to each other. The needle roller 14 is held with equal retaining force at both sides thereof, and is stably held in parallel to a roller 3 without inclination of the needle roller 14.
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