| 摘要 |
PROBLEM TO BE SOLVED: To hold slide rotation with low rotation torque as a yield strength against the high axial load of a supporting shaft part is provided, in a roller bearing used in a universal joint. SOLUTION: A roller bearing is provided with a bearing cup 5 formed in the shape of a cylinder with a bottom, and a plurality of roller disposed on the inner surface of a cylinder. A shaft part 3 inserted through a release end face has a peripheral surface brought into contact with the roller, and a tip surface is brought into contact with a support protrusion part 12 formed in a protruding state on the inner surface side of the bottom plate part 8 of the bearing cup 5. An auxiliary protrusion part 13 usually maintains a state to make non-contact state with the tip surface of the shaft part 3 but supports the tip surface of the shaft part 3 when an excessive axial force is exerted on the bottom side of the shaft part 3, the auxiliary protrusion being formed around the support protrusion 12. In this case, the auxiliary protrusion part 13 is formed in an annular shape or in a state that a plurality of protrusions are formed or in a plurality of spots. |
