Abstract
Continued to the first report, this paper deals with the behavior of cooling generated by vortex tube leading to a set of angular contact ball bearings operated which are high speed in machine tool spindle. The main purpose is to make clear the bearing cooling mechanism by measuring the temperature and flow situation of cooling air, which are exerted by the air flow layer produced from the rotation of bearing retainer, and the bearing circumference temperature distribution. As a result of the experiment, the followings are clarified. (1) If the distance between bearing and cooling air nozzle is 25 mm or less, cooling effect is obtained almost the same. (2) The temperature of cooling air has a little change by arrangement angle between rotating directions of bearing and the cooling air nozzle. (3) As for the cooling air, the temperature can rise immediately after jetted from a nozzle and keep 0 degree or less to the location where is around 15 mm apart from the nozzle. (4) The cooling air supplied to bearing does not reach at the inside of bearing, and revolves around perimeter of bearing.
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