Patent ID: 8039999

Claim:
A heat dissipation structure for sealed machine tools, comprising: a machine tool housing having a chamber and a wall which has a heat dissipation vent communicating with the chamber and the exterior; a stator located in the chamber; and a rotor located in the chamber between the stator and the housing; wherein the rotor and the wall of the housing form a swirling flow space therebetween, the rotor and the stator forming an axial flow space therebetween, the swirling flow space and the axial flow space being interposed by a radial airflow passage for communicating therewith, the rotor having an axial flow aperture communicating with the swirling flow space and the axial flow space, the rotor having at least one flow directing portion, the rotor rotating relative to the stator, the stator generating thermal airflow flowing radially from the axial flow space through the radial airflow passage to the swirling flow space, the flow directing portion discharging the thermal airflow through the heat dissipation vent to the exterior and directing external cooling airflow through the axial flow aperture into the axial flow space to form a circulating heat dissipation airflow.