To prevent deflection of stress generated in a cage when an inner ring 12 is inserted into the cage 14 with conical rollers, in a conical roller bearing A using the synthetic resin cage 14.
In this conical roller bearing A, the plurality of conical rollers 13 are disposed between an outer ring 11 and the inner ring 12 at desired intervals in the circumferential direction, the synthetic resin cage 14 is disposed to retain the conical rollers 13 at the desired intervals, and a conical roller raceway surface 12a of the inner ring 12 has a small flange portion 12b at its small-diameter side and a large flange portion 12c at its large-diameter side. As an angle γ of an outer peripheral inclined surface 16 of the small flange portion 12b is determined to be same as a central angle α2 of the inner ring or more (γ≥α2), an inclination angle α2 of the raceway surface 12a is smaller than an inclination angle γ of an outer peripheral face 16 of the small flange portion, when the conical roller 13 is put on an outer peripheral face 16 of the small flange portion 12b, and then fitted to the raceway surface 12a of the inner ring 12, thus diameter expansion force is not generated, the deflection of the diameter expansion force is not generated, and deterioration of durability of the cage is not found.
NISHIWAKI EIJI
Torii Kazuhisa
Takayoshi Tagawa
Higashio Masahiro