Double-row self-aligning roller bearing and protrusion prevention jig

A protrusion prevention device to be used for a double-row self-aligning roller bearing comprising:

• an inner ring;
• an outer ring having a spherical raceway surface;
• and
• rollers in two rows juxtaposed to each other in a bearing width direction and interposed between the inner ring and the outer ring, each of the rollers in the two rows having an outer circumferential surface having a cross-sectional shape that matches the raceway surface of the outer ring,
• wherein either or both of shapes and contact angles of the rollers in the two rows are different from each other,
• an end surface of either or each of the inner ring and the outer ring is formed with a plurality of attachment holes, each attachment hole of the plurality of attachment hole-holes is attached with only one protrusion prevention jig of a plurality of protrusion prevention jigs for preventing protrusion of the end surface of the inner ring in the bearing width direction with respect to the end surface of the outer ring due to the inner ring and the outer ring being inclined relative to each other with respect to a state where the inner ring and the outer ring confront each other, the protrusion prevention device comprising the plurality of protrusion prevention jigs, each comprising:
• a contact member configured to be placed on each of end surfaces at the same side in the bearing width direction of the inner ring and the outer ring;
• and
• a fixing member configured to be inserted into the attachment hole and fix the contact member to one race ring out of the inner ring and the outer ring that is provided with the attachment hole.