Self-aligning bearing

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;
• a single inner ring inserted to the inner periphery of the outer ring via a predetermined interval;
• a plurality of cylindrical rollers interposed in an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring 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 the single inner ring, respectively, and a loose rib is attached to an another outer end of the inner ring in the axial direction;
• 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.

A roll shaft supporting device in a carrying system of a continuous casting equipment, in which two roll shafts are arranged side by side in an axial direction, both ends of each of the roll shafts being supported to an axle box corresponding to each of both the ends by using a self-aligning bearing, the self-aligning bearing comprising:

• a fixed side self-aligning bearing supporting an inner end of each of the roll shafts so as to be immobile in an axial direction;
• and
• a free side self-aligning bearing supporting an outer end of each of the roll shafts in a free state in the axial direction, wherein the fixed side self-aligning bearing comprises:
• 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 outer ring via a predetermined interval;
• and
• a plurality of cylindrical rollers interposed in an annular space between the outer ring and the two inner rings in adjacent two rows in the axial direction, and 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 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 axial 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.

A roll shaft supporting device in a carrying system of a continuous casting equipment, in which two bending and expanding/contracting roll shafts are arranged side by side in an axial direction, both ends of each of the roll shafts being supported to an axle box corresponding to each of both the ends by using a self-aligning bearing, the self-aligning bearing comprising:

• a fixed side self-aligning bearing supporting an inner end of each of the roll shafts so as to be immobile in an axial direction;
• and
• a free side self-aligning bearing supporting an outer end of each of the roll shafts in a free state in the axial direction, wherein the fixed side self-aligning bearing comprises:
• 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 fined to the inner peripheral surface of the self-aligning ring;
• a single inner ring inserted to the inner periphery of the outer ring via a predetermined interval;
• a plurality of cylindrical rollers interposed in an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring 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 the single inner ring, respectively, and a loose rib is attached to an another outer end of the inner ring in the axial direction;
• 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.