Patent ID: 7093981
Filing Date: 2006-08-22
Classification: F16C

Abstract:
1. A self-aligning bearing positioning and supporting one end of an expanding/contracting rotation shaft in an axial direction and allowing the rotation shaft to bend, comprising: a self-aligning ring having an inner peripheral surface formed in a spherical shape; a single outer ring having an outer peripheral surface formed in a spherical shape and fitted to the inner peripheral surface of the self-aligning ring; two inner rings inserted to the inner periphery of the enter ring via a predetermined interval; a plurality of cylindrical rollers interposed in an annular space between the inner peripheral surface of the outer ring and the outer peripheral surfaces of the two inner rings in adjacent two rows in the axial direction, wherein a radially inward rib is provided between two rows of cylindrical rollers in the axial direction on the inner peripheral surface of the outer ring, and a radially outward rib is provided in an outer end in the axial direction of each of the two inner rings, respectively; and the radially inner periphery of each outer ring, at distal axially outer ends, having no radially inwardly projecting rib; and the radially outer periphery of the inner ring having no radially outwardly projecting rib disposed between the two rows of cylindrical rollers.