| 摘要 |
PURPOSE:To maintain high cooling performance even at high speed rotation time by forming the bore of a heat receiver of a heat pipe larger than that of a heat sink. CONSTITUTION:A heat pipe 6 is formed so that the bores Da, Db of heat pipes 6a, 6b of the part to a rotor 2 as a heat receiver and a bearing 12 are larger than the bore Dc of a heat pipe 5c of the part opposed to a heat sink fin 7 of a heat sink. When a rotational shaft 1 is rotated at a high speed, the work liquid condensed at the heat sink 6c of the heat pipe 6 is transferred to the heat receivers 6a, 6b side due to the difference of centrifugal force at the heat sink 6c and the heat receivers 6a, 6b, and the rotor 2 and the bearing 12 opposite to the heat receivers 6a, 6b are effectively cooled. |
