Patent ID: 8297849

Claim:
A roller bearing, comprising: an inner ring, comprising an outer peripheral face provided with an inner ring raceway surface and an inner peripheral face adapted to be clearance-fitted with a rotary shaft; an outer ring, disposed coaxially with the inner ring at an outside in a radial direction of the inner ring, the outer ring comprising an inner peripheral face provided with an outer ring raceway surface; and a plurality of rollers, the plurality of rollers being rollably disposed between the inner ring raceway surface and the outer ring raceway surface, wherein the roller bearing is configured to supply grease to an area between the inner ring raceway surface and the outer ring raceway surface, wherein the inner ring is formed with an oil hole defined therein extending through a part between the inner ring raceway surface and the inner peripheral face of the inner ring, and configured to feed the grease, which has been supplied to the area between the inner ring raceway surface and the outer ring raceway surface, to the inner peripheral face of the inner ring in accordance with a rolling of the rollers, wherein the inner peripheral face of the inner ring is formed with a plurality of lubrication grooves defined therein, the plurality of lubrication grooves being configured to guide the grease, which has been fed to the inner peripheral face of the inner ring through the oil hole, to opposite end portions of the inner peripheral face in an axial direction of the inner ring, wherein the lubrication grooves comprise inclined grooves each comprising two portions extending toward the opposite end portions of the inner peripheral face in the axial direction of the inner ring, and wherein the plurality of inclined grooves extend in a forward direction with respect to a rotational direction of the roller bearing.