| 摘要 |
PROBLEM TO BE SOLVED: To efficiently cool an EGR valve and to connect cooling water passages from an air compressor and the EGR valve with one another through relatively simple pipe lines. SOLUTION: An output port 16b of a radiator 16 is connected thereto with an inlet port 12b of a block cooling water passage 12a through the intermediary of a thermostat 15 and a coolant pump 14. An outlet port 12c of the block cooling passage 12a is connected thereto with an inlet port 13b of a head cooling passage 13a, and an outlet port 13c of the head cooling passage is connected to an inlet port 16a of the radiator 16, and is connected to an intake port 14b of the coolant pump 14 through the intermediary of the thermostat. A branch outlet port 12e of the block cooling passage is connected thereto with an inlet port 17b of a compressor cooling passage of an air compressor 17, and an inlet port 18b of a valve cooling water passage in an EGR valve 18 is connected to an outlet port 17c of the valve cooling passage. Further, an outlet port 18c of the valve cooling passage is connected to the intake port of the coolant pump.
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