HIGH SPEED ROTATION TABLE HAVING SHAFT PENETRATION COOLING STRUCTURE

摘要

PURPOSE: A rotation table of a machine tool is provided with an air passage to cool a rotating member and a fixing member of a motor, thereby limiting heating of the motor. CONSTITUTION: A rotation shaft(150) is installed in lower part of a rotation table(100) supporting a table housing with a roller bearing(160). A rotating member(450) is inserted to an outer circumference of the rotation shaft. A fixing member(400) is fixed to the table housing. A sleeve(500) of a ring shape is inserted between the rotation shaft and the rotating member. A plurality of through holes is formed on the sleeve. An injection port(230) is formed in upper ends of the rotating member and the fixing member to inject air. An air passage(200) is formed in the table housing to introduce air.