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Drive device

  • US 20050253465A1
  • Filed: 05/08/2003
  • Published: 11/17/2005
  • Est. Priority Date: 09/13/2002
  • Status: Active Grant
First Claim
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1. A drive unit including an electric motor (1), a drive unit casing (2) accommodating therein the electric motor, an inverter (3) that controls the electric motor, and a flow passage (4) of a refrigerant that cools the inverter, the drive unit characterized in that the inverter is mounted on the drive unit casing such that a heat sink (53) united with a substrate of the inverter defines a space (R) on a portion thereof opposed to the drive unit casing, the space is communicated to the flow passage of the refrigerant, the heat sink comprises heat-sink side fins (56) extending into the space toward the drive unit casing, and the heat-sink side fins and the drive unit casing contact with each other in a state of low thermal conduction.

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