Drive device

Abstract

A drive unit including an electric motor, a drive unit casing accommodating therein the electric motor, an inverter that controls the electric motor and a flow passage in which a refrigerant passes therein in order to cool the inverter, wherein the inverter is mounted on the drive unit casing such that a heat sink, united with a substrate of the inverter, defines a space that is in communication with the flow passage on a portion thereof opposed to the drive unit casing, the space is compartmented by a separator into a first chamber facing the heat sink and a second chamber facing the drive unit casing and the heat sink comprises heat-sink side fins extending into the first chamber and apart from the separator.

Dependencies are inferred from the claim text.