초록 ▼

A drive unit includes an electric motor as a power source, and a simplified coolant circuit for cooling the electric motor. The drive unit further includes, in the drive unit case, a circulation passage L for coolant for cooling the motor M. A circulation passage F for a second coolant is provided s

A drive unit includes an electric motor as a power source, and a simplified coolant circuit for cooling the electric motor. The drive unit further includes, in the drive unit case, a circulation passage L for coolant for cooling the motor M. A circulation passage F for a second coolant is provided separate from the circulation passage L for coolant. A heat exchange portion C within the circulation passage L for the first coolant is provided in the drive unit case for heat exchange with the second coolant in the circulation passage F, and the first coolant for cooling the electric motor is cooled by heat transfer to the second coolant in that heat exchange portion C. Accordingly, the coolant circuit in the drive unit case is simplified.

대표청구항 ▼

[ What is claimed is:] [1.]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; an

[ What is claimed is:] [1.]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; anda 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.