| 摘要 |
A drive device, comprising an electric motor (1), a drive device case (2) for storing the electric motor, an inverter (3) for controlling the electric motor, and a flow passage for a medium cooling the inverter, wherein the inverter is installed on a heat sink (53), the heat sink (53) is installed on the drive device case with spaces (R) formed therebetween, and the spaces (R) are allowed to communicate with the flow passage for the medium, and the heat sink having fins (56) and the drive device case having fins (22) are positioned so that these fins are separated from each other, whereby both the drive device case and the heat sink can be effectively cooled by a heat exchange with the cooling medium in large areas, a direct heat exchange can be avoided since the fins are separated from each other, and an efficient cooling keeping a temperature gradient according to the heat- proof temperatures of the inverter and the electric motor can be performed.
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