To effectively cool a plurality of cooling media while preventing deterioration of sound vibration performance.
A heat exchange part 17 is provided with an upper tank part 19 and a lower tank part 21. The heat exchange part 17 includes a first cooling water passage 17a for first cooling water and a second cooling water passage 17b for second cooling water, wherein a temperature control passage 23 is provided between the cooling water passages 17a, 17b. The upper tank part 19 is provided with a first inlet side opening and closing valve 25 and a second inlet side opening and closing valve 29, and the lower tank part 21 is provided with a first outlet side opening and closing valve 27 and a second outlet side opening and closing valve 31. When the first and second cooling water has normal temperature, the first inlet side opening and closing valve 25 and the first outlet side opening and closing valve 27 are closed, and the second inlet side opening and closing valve 29 and the second outlet side opening and closing valve 31 are opened, so that the second cooling water flows through the temperature control passage 23. When the first cooling water is above a preset temperature, the first inlet side opening and closing valve 25 and the first outlet side opening and closing valve 27 are opened, and the second inlet side opening and closing valve 29 and the first outlet side opening and closing valve 31 are closed so that the first cooling water flows through the temperature control passage 23.
SHIMONOSONO HITOSHI
Iwa Saki Kokuni
Akira Kurihara
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
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