| 摘要 |
PROBLEM TO BE SOLVED: To stabilize the pre-load torque while reducing the dispersion of a contact point by forming a large end face of a tapered roller into a conical surface, and forming a generating line of a large flange face of an inner ring into a projecting arc. SOLUTION: A flange face of a large flange 24, namely a large flange face 24a, of an inner ring 20 is provided so as to come into contact with a large end surface of a tapered roller 40 for guide, and formed into a curved surface formed with a projecting arc, of which center of curvature exists on the center line passing through a point (e), as a generating line. A large end face of the tapered roller 40 is formed of a tapered face 44a opposite to a tapered face of a rolling face 42, and smoothly continued to the rolling face 42. The large end face of the tapered roller 40 and the large flange part 24 of the inner ring 20 contact with each other at the point (e), but since the large end face of the tapered roller 40 is formed into the conical face 44a, accurate finish is obtained in comparison with the conventional one partially formed with a spherical surface. Consequently, dispersion of the contact (e) with the large flange face 24 of the inner ring 20 is reduced, and the tapered roller 40 can be set at a fixed point on design. |
