Tapered roller bearing and power transmission device

摘要

A curvature radius of a large rib end face of an inner ring is set to a value larger than a distance R, and a curvature radius of a large end face of a tapered roller is set to a range of 80 to 100% relative to the distance R, where R represents a distance from a cone center of the tapered roller to a predetermined reference point that is separated from the cone center along an inner ring raceway surface. A center of a contact ellipse that is formed by contact between the large end face of the tapered roller and the large rib end face of the inner ring is located on an imaginary straight line passing through a center of curvature of the large end face of the tapered roller and a center of curvature of the large rib end face of the inner ring.

主权项

1. A tapered roller bearing comprising:
an inner ring having an inner ring raceway surface and a large rib that adjoins one side of the inner ring raceway surface in an axial direction; an outer ring that is disposed concentrically with the inner ring radially outward of the inner ring and has an outer ring raceway surface facing the inner ring raceway surface; a plurality of tapered rollers that are interposed between the inner ring raceway surface and the outer ring raceway surface in a rollable manner; and a cage that holds the tapered rollers at predetermined intervals in a circumferential direction, wherein a large end face of each of the tapered rollers is formed as a convex surface, and a large rib end face of the inner ring which is slide-contacted by the large end face of the tapered roller is formed as a concave surface, a curvature radius Ri of the large rib end face is set to a value larger than a distance R, and a curvature radius Rr of the large end face of the tapered roller is set to a range of 80 to 100% relative to the distance R, where R represents a distance from a cone center of the tapered roller to a predetermined reference point that is separated from the cone center along the inner ring raceway surface, and a center of a contact ellipse that is formed by contact between the large end face of the tapered roller and the large rib end face is located on an imaginary straight line passing through a center of curvature of the large end face of the tapered roller and a center of curvature of the large rib end face.