PURPOSE: To cool a main spindle device effectively and evenly, by a method wherein a working liquid is streamed to a vapor tube and a liquid tube, a calorific value of a bearing rest is transmitted to a radiator from a hollow chamber.
CONSTITUTION: Calorific values of bearings 3-31, which received heat by bearing rests 4-41, are taken away as evaporation latent heat when a working liquid such as Flon in hollow chambers 7-71 is made to evaporate by heating the working liquid. Vapor such as the evaporated Flon is moved to a radiator 8 through a branch pipe and a confluent pipe of a vapor tube 10 by making use of its own vapor pressure and cooled by a cooling fan 9. The condensed working liquid is returned to the hollow chambers 7-71 of the bearing rests 4-41 through liquid tubes 12-121 by making use of gravity.
KATAOKA KENJI
YAMAKAGE HISAAKI
