Rotary table device with cooling structure, rotary bearing with cooling structure

摘要

A rotary table device including a cooling structure capable of exhibiting an appropriate cooling effect and a rotary bearing including a cooling structure are obtained. The rotary table device 5 having a cooling structure includes a hollow motor 10 that is a drive source, a table 20 that can be rotated by the hollow motor 10, and a rotary bearing 30 that supports the rotational motion of the table 20. The rotary bearing 30 includes an outer ring 31 provided with a rolling surface on the inner circumferential surface, an inner ring 32 provided with a rolling surface opposite to the rolling surface on the outer circumferential surface, and the rolling surface of the outer ring 31 and the inner ring 32. A plurality of rolling elements 33 loaded in a rolling path formed by the rolling surface, and a heat sink 36 is installed on either the inner ring 32 or the outer ring 31.