| 主权项 |
1. A cooling structure of a urea aqueous solution pipe laid to a selective catalytic reduction device in an exhaust gas aftertreatment device, the exhaust gas aftertreatment device being provided in an engine compartment that is adjacent to a cooling fan through which cooling air is supplied to a heat exchanger, the heat exchanger being disposed in a heat exchanger compartment, an air in the heat exchanger compartment and the engine compartment being discharged by the cooling fan, the selective catalytic reduction device using ammonia obtained from a urea aqueous solution as a reduction-causing agent, the urea aqueous solution pipe supplying the urea aqueous solution to the selective catalytic reduction device through the engine compartment, the selective catalytic reduction device being disposed above an engine, and the cooling structure comprising:
a pipeline-forming member provided in the engine compartment and comprising a pipeline in which the urea aqueous solution pipe is arranged, the pipeline-forming member being provided at a position proximate to or in contact with an inside of a hood defining a ceiling of the engine compartment; and an air intake hole that is provided to the hood to intercommunicate the pipeline with an outside of the engine compartment, wherein: an end of the pipeline intercommunicates with the heat exchanger compartment, the urea aqueous solution pipe is disposed in the pipeline from a urea aqueous solution tank set under the heat exchanger compartment through the heat exchanger compartment and an end of the pipeline-forming member, and the cooling air in a form of an outside air sucked by the cooling fan flows through the air intake hole into the pipeline to be delivered to the heat exchanger compartment to cool the urea aqueous solution pipe. |
