Patent ID: 8316776
Filing Date: 2012-11-27
Classification: B23Q,F16C

Abstract:
1. A rotary table device comprising: a hollow motor constituting a drive source; a table rotated by the hollow motor; and a rotary bearing supporting rotational motion of the table, the rotary bearing comprising: an outer race having an inner surface to which a rolling surface is formed; an inner race having an outer peripheral surface to which a rolling surface opposing to the rolling surface of the outer race is formed; and a plurality of rolling members disposed in a rolling passage formed by the rolling surface of the outer race and the rolling surface of the inner race, wherein a cooling medium passage is formed between the table and at least one of the inner race and outer race constituting a rotational driving side, wherein the at least one of the inner race and outer race constituting a rotational driving side provide a plate member which is rotatable together with at least one of the inner race and outer race constituting a rotational driving side, and the plate member provided with a cooling fin on the outer peripheral surface.