Patent ID: 9051964
Filing Date: 2015-06-09
Classification: B60B,F16C

Abstract:
1. A tapered roller bearing apparatus comprising: an outer ring that includes an outer-ring raceway formed in an inner circumferential surface thereof; an inner ring which includes a large-diameter portion including a cylindrical portion with a substantially uniform outer diameter, a large rib portion including an outer circumferential surface and a guide surface continued to the outer circumferential surface, an inner-ring raceway, and a small-diameter cylindrical portion which are sequentially formed from one end to the other end, and are subjected to a heat treatment to have a surface-hardened layer; a plurality of tapered rollers which are rollably disposed between the inner-ring raceway and the outer-ring raceway, a large-diameter end surface of the tapered roller being guided by the guide surface, wherein an angle formed between the guide surface and the outer circumferential surface is obtuse, and wherein an angle a formed between a line parallel to an, axis and the outer circumferential surface of the large rib portion is in a range of 45°<α<90°.