Tapered roller bearing

Abstract

An object of the present invention to provide a tapered roller bearing in which a flange portion is formed at a large-diameter end of an outer ring track surface of an outer ring, capable of providing high moment stiffness and long life without extremely decreasing its pure axial load capacity. The tapered roller bearing comprising: an outer ringhaving an outer ring track surfaceon its inner circumferential surface; an inner ringhaving an inner ring track surfaceon its outer circumferential surface; a plurality of tapered rollersrotatably disposed between the outer ring track surfaceand the inner ring track surface; and a retainerhaving a plurality of pockets for retaining the plurality of tapered rollersat a predetermined interval; the outer ring track surfaceof the outer ringhaving a small-diameter end and a large-diameter end, the inner ring track surfaceof the inner ringhaving a small-diameter end and a large-diameter end, and, of these four ends, a flange portionthat protrudes radially inwardly is formed at the large-diameter end of the outer ring track surfaceof the outer ring; wherein the tapered roller bearing has a contact angle greater than 35° and a roller angle not greater than 3.5°.