Patent ID: 9664230
Date: 2017-05-30
CPC Classifications: F16C

Claim:
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 first diameter annular portion, a second diameter annular portion opposing the first diameter annular portion at a predetermined distance therefrom, the second diameter annular portion being larger in diameter than the first diameter annular portion, and a plurality of pillar portions which connect the first diameter and the second diameter annular portions such that spaces each surrounded by adjacent ones of the pillar portions and by the first diameter and the second diameter annular portions are formed as pockets receiving the taper rollers, respectively, wherein as viewed in a radial direction, a clearance is provided circumferentially in the pocket with respect to a rolling surface of each of the taper rollers, 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, 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, and wherein an axial end of the pillar portions approximate the second diameter annular portion includes a step portion that forms a cut portion, wherein in the step portion the pillar portions do not slide-contact the outer ring raceway surface by way of the step portion extending radially inward from an outer circumferential surface of the pillar portions that is in slide-contact with the outer ring raceway surface, the cut portion extending axially from the step portion of the pillar portions into an outer circumferential side of the second diameter annular portion, such that lubricating oil for lubricating between the inner and outer rings is allowed to be discharged from an inside of the bearing via the cut portion.