| 主权项 |
1. A taper roller bearing comprising:
an inner ring comprising an inner ring raceway surface; an outer ring which is disposed on an outer circumferential side of the inner ring and coaxially with the inner ring and which comprises an outer ring raceway surface opposing the inner ring raceway surface; a plurality of taper rollers rotatably arranged between the inner ring raceway surface and the outer ring raceway surface; and a cage which comprises a small diameter annular portion, a large diameter annular portion opposing the small diameter annular portion at a predetermined distance therefrom, and a plurality of pillar portions which connect the annular portions such that spaces each surrounded by adjacent ones of the pillar portions and the annular portions are formed as pockets receiving the taper rollers, respectively, wherein a first sliding surface is provided in at least one of the annular portions to slide-contact end surfaces of the taper rollers so as to axially position the cage by the end surfaces of the taper rollers, and wherein second sliding surfaces are provided in the pillar portions to slide-contact the outer ring raceway surface so as to radially position the cage by the outer ring raceway surface. |
