ROTATION BEARING, ROTATION TABLE DEVICE, AND METHOD OF DERMINING TABLE DIAMETER

摘要

A rotation table device (5) has a hollow motor (10) as a drive source, a table (20) capable of being rotated by the hollow motor (10), and a rotation bearing (30) for supporting rotational motion of the table (20). The rotation bearing (30) of the rotation table device (5) includes an outer ring (31) having a rolling surface provided on its inner peripheral surface, an inner ring (32) having a rolling surface provided on its outer surface and facing the rolling surface of the outer ring (31), and rolling bodies (33) placed in a rolling path formed by the rolling surface of the outer ring (31) and the rolling surface of the inner ring (32).Cooling medium routes (a, ß) are arranged adjacent to either of the inner and outer ring (32, 31) which is on the rotation drive side. The construction provides the rotation bearing and the rotation table device with an appropriate cooling effect.