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Drive unit with two coolant circuits for electric motor

  • US 6,323,613 B1
  • Filed: 04/26/2000
  • Issued: 11/27/2001
  • Est. Priority Date: 04/27/1999
  • Status: Expired due to Term
First Claim
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1. A drive unit for a vehicle comprising:

  • a drive unit case;

    an electric motor mounted within said drive unit case;

    a first circulation passage for a first coolant, for cooling said electric motor, within the drive unit case;

    an inverter for controlling said electric motor; and

    a second circulation passage for a second coolant separate from said first circulation passage and including a heat exchange portion within a drive unit case, for heat exchange between the first and second coolants, and a cooling section for cooling the inverter, whereby the first coolant for cooling the electric motor is cooled by the second coolant.

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