| 摘要 |
A tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers, and a holder. A nitrogen concentration in a surface layer portion under a contact surface is 0.3 mass % or more. The holder includes a small annular portion, a large annular portion, and a plurality of column portions. A pocket has a trapezoidal shape in which a portion housing a small diameter side of the tapered roller is located on a reduced width side while a portion housing a large diameter side of the tapered roller is located on an increased width side. Each of the column portions on the reduced width side of the pocket is provided with a cutout. |
| 主权项 |
1. A tapered roller bearing comprising:
an outer ring having an outer ring rolling contact surface on an inner circumferential surface; an inner ring having an inner ring rolling contact surface on an outer circumferential surface, having a small collar and a large collar formed on both sides of said inner ring rolling contact surface, and arranged on an inner side of said outer ring; a plurality of tapered rollers arranged between said outer ring rolling contact surface and said inner ring rolling contact surface; and a holder having a pocket housing each of said tapered rollers, at least one of bearing components including said outer ring, said inner ring and said tapered roller being made of steel containing 0.6 mass % or more and 1.50 mass % or less of carbon, 0.15 mass % or more and 2.50 mass % or less of silicon, 0.30 mass % or more and 1.50 mass % or less of manganese, and 0.20 mass % or more and 2.00 mass % or less of chromium, with the rest made up of impurities, a nitrogen concentration in a surface layer portion under a contact surface in contact with another component being 0.3 mass % or more, said holder including a small annular portion continuously extending on a side of a small diameter end face of said tapered roller, a large annular portion continuously extending on a side of a large diameter end face of said tapered roller, and a plurality of column portions coupling said small annular portion and said large annular portion, said pocket having a trapezoidal shape in which a portion housing a small diameter side of said tapered roller is located on a reduced width side while a portion housing a large diameter side of said tapered roller is located on an increased width side, and each of said column portions on said reduced width side of said pocket being provided with a cutout. |
