To provide a tapered roller bearing capable of reducing slide resistance when difference between rotation speed of a roller on a small diameter side and rotation speed of a roller on a large diameter side occurs, reducing rolling viscosity resistance of the rollers, and suppressing increase of torque by utilizing skew prevention characteristic of the tapered roller bearing having a roller divided shape and being applicable to a pilot part of a transmission.
This tapered roller bearing has a plurality of rollers 3A, 3B arranged in parallel in the axial direction in each pocket 4a provided in a plurality of sections in the circumferential direction of a cage 4. A plurality of these rollers 3A, 3B arranged in parallel in the axial direction have circular cone faces having difference in diameter for each other so as to constitute substantially virtual circular cone faces whose outer peripheral faces are common for each other. A small end face 3Ab of the roller 3A on the large diameter side or a large end face 3Ba of the roller 3B on the small diameter side has a spherical face shape and comes into point-contact with the large end face 3Ba of the roller 3B on the small diameter side or the small end face 3Ab of the roller 3A on the large diameter side on the center of a rotary shaft. A chevron-shaped crowning is applied to rolling faces 3Ac, 3Bc of the rollers 3A, 3B or a raceway surface 1a of an inner ring 1.
Shuji Sugimoto
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