Patent ID: 7841773

Claim:
A tapered roller bearing comprising an inner ring having a conical surface-like raceway surface in an outer periphery and formed with a cone back face rib and a cone front face rib on the opposite sides of the raceway, an outer ring having a conical surface-like raceway in an inner periphery, a plurality of tapered rollers interposed between the raceways of the inner and outer rings, and a cage for holding the tapered rollers in predetermined circumferential intervals, wherein a ratio R/R BASE of a radius of curvature R of a large end face of the tapered roller to a distance R BASE from an apex of cone of the tapered roller to a cone back face rib surface of the inner ring is set at 0.75 to 0.87, and wherein an end face deflection of the large end face of the tapered roller is 3 μm or less.