| 摘要 |
PROBLEM TO BE SOLVED: To easily perform cleaning work of these coolers, while securing cooling performance of a plurality of coolers mutually superposably arranged on a cooling air flow passage, in a work machine such as a hydraulic excavator. SOLUTION: This multiple structure cooling system has the plurality of coolers 11a and 11b mutually superposably arranged on the cooling air flow passage. The multiple structure cooling system with a duct comprises a cover member for covering the outer periphery of a space S between mutually opposing one surface 11a<SB>1</SB>and one surface 11b<SB>1</SB>of at least adjacent two coolers 11a and 11b among the plurality of coolers 11a and 11b, an opening part 19 formed in the cover member, and the duct 30 formed over the other surface 11b<SB>2</SB>side of the cooler 11b positioned on the downstream side of the cooling air flow passage among the two coolers 11a and 11b from the opening part 19. COPYRIGHT: (C)2007,JPO&INPIT
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