| 主权项 |
1. A tapered roller bearing comprising:
an inner ring having a small rib in a small-diameter side, the inner ring whose outer peripheral surface is formed with a conical inner ring raceway surface, an outer ring whose inner peripheral surface is formed with a conical outer ring raceway surface, plural tapered rollers rollably circumferentially arranged between the inner ring raceway surface and the outer ring raceway surface, and a cage for holding the tapered rollers by plural pockets formed between a large-diameter side annular part and a small-diameter side annular part arranged in an axial direction, and plural bar parts which axially join the large-diameter side annular part and the small-diameter side annular part and are circumferentially formed at substantially an equal distance, wherein a value of a ratio of a cross section modulus of the small-diameter side annular part of the cage to a cross section modulus of the large-diameter side annular part of the cage is within range from 0.5 to 1.5 (both inclusive). |
