| abstract |
This tapered roller bearing (1A) is provided with an outer race (11), an inner race (12), a plurality of tapered rollers (13), and a holder (20). The outer race (11), inner race (12), and tapered rollers (13) comprise a steel containing 0.6-1.50 mass% inclusive of carbon, 0.15-2.50 mass% inclusive of silicon, 0.30-1.50 mass% inclusive of manganese, and 0.20-2.00 mass% inclusive of chromium, and containing residual impurities. The nitrogen concentration at the surface layer is at least 0.3 mass%. The holder (20) includes a small ring-shaped section, a large ring-shaped section, and a plurality of columns. A pocket has a trapezoidal shape such that the portion housing the small-diameter side of the tapered rollers (13) is the narrow-width side and the portion housing the large-diameter side of the tapered rollers (13) is the wide-width side. A notch is provided to the pillar section at the narrow-width side of the pocket. |