Patent ID: 8636420

Claim:
A double row tapered roller bearing comprising: an inner ring comprising two abutted inner ring members having a flange part at one end of each inner ring member or a flange part at each end of each inner ring member; an outer ring; and tapered rollers arranged between said inner ring and said outer ring in double rows, wherein the flange part at the one end or both ends of each said inner ring member has a thin-wall part having a diameter direction thickness on an end face side thereof, and a thick-wall part having a diameter direction thickness on a center side of the inner ring, the diameter direction thickness of the thin-wall part being less than the diameter direction thickness of the thick-wall part, wherein the diameter direction difference between the thin wall part and the thick wall part is located on an outer radial side of the inner ring member, the inner diameter surface of said inner ring member has a contact part fitted to a shaft at a center part thereof, a non-contact part apart from the shaft in the diameter direction at an outer edge of the inner ring, and a ridge line part positioned on a boundary between said contact part and said non-contact part, and the axial direction width L 1 of said thin-wall part measured from the end face of said inner ring member and the axial direction distance L 2 between the end face and said ridge line part of said inner ring member have a relation of L 1 >L 2 , and further wherein the flange part includes an outer surface that extends from the end face of the inner ring, the outer surface extending linearly from the end face of the inner ring to a recess sized to receive the roller.