| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-cooled oil cooler capable of realizing substantial improvement of cooling performance without causing enlargement of a core size. SOLUTION: The air-cooled oil cooler 1 is comprised by plurally laminating tubes 4 with inner fins 8 arranged between a pair of plate members in a state with communication holes 10 and 11 formed on both sides. An outer fin 5 provided with one return louver between a ridge part and a trough part of a waveform is arranged between the tubes. The inner fin 8 is offset, and it is shaped such that flatness of the tube 4 is A1/A2×100=4.8 to 7.4% when a height is A1, and a width is A2 in the tube 4. COPYRIGHT: (C)2006,JPO&NCIPI
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