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 t
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.
대표청구항▼
The invention claimed is: 1. A drive unit, comprising: 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 moun
The invention claimed is: 1. A drive unit, comprising: 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. 2. The drive unit according to claim 1, wherein the drive unit casing comprises drive-unit-side fins extending into the second chamber. 3. The drive unit according to claim 2, wherein the drive-unit-side fins are apart from the separator. 4. The drive unit according to claim 3, wherein the separator comprises a low thermal conductive member made of a material of low thermal conductivity. 5. The drive unit according to claim 3, wherein the separator comprises a separation member and a low thermal conductive member provided along the separation member and made of a material of low thermal conductivity. 6. The drive unit according to claim 3, wherein the separator comprises separation members with a low thermal conductive portion therebetween. 7. The drive unit according to claim 2, wherein the separator comprises a low thermal conductive member made of a material of low thermal conductivity. 8. The drive unit according to claim 2, wherein the separator comprises a separation member and a low thermal conductive member provided along the separation member and made of a material of low thermal conductivity. 9. The drive unit according to claim 2, wherein the separator comprises separation members with a low thermal conductive portion therebetween. 10. The drive unit according to claim 1, wherein the separator comprises a low thermal conductive member made of a material of low thermal conductivity. 11. The drive unit according to claim 1, wherein the separator comprises a separation member and a low thermal conductive member provided along the separation member and made of a material of low thermal conductivity. 12. The drive unit according to claim 1, wherein the separator comprises separation members with a low thermal conductive portion there between. 13. The drive unit according to claim 1, wherein the heat-sink side fins have a column shape and are arranged lengthwise and crosswise at a predetermined pitch. 14. The drive unit according to claim 1, wherein the heat-sink side fins are rib shaped fins which are arranged parallel with the flow passage in which the refrigerant passes. 15. The drive unit according to claim 2, wherein the heat-sink side fins have a column shape and are arranged lengthwise and crosswise at a predetermined pitch and the drive-unit-side fins are rib shaped fins which are arranged parallel with the flow passage in which the refrigerant passes. 16. The drive unit according to claim 15, wherein the first chamber and the second chamber are in parallel communication with the flow passage. 17. The drive unit according to claim 1, wherein the first chamber and the second chamber are in parallel communication with the flow passage. 18. The drive unit according to claim 1, wherein the first chamber and the second chamber are in serial communication with the flow passage. 19. The drive unit according to claim 2, wherein the heat-sink side fins and the drive-unit-side fins are rib shaped fins which are arranged parallel with the flow passage in which the refrigerant passes with the heat-sink side fins arranged at smaller intervals. 20. The drive unit according to claim 2, wherein the drive-unit-side fins contact the separator.
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