| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tube internal structure of an oil cooler for a construction machine, which reduces oil passing resistance while keeping radiating performance in a state of keeping a dimension of the oil cooler as it is. <P>SOLUTION: In the oil cooler for the construction machine constituted by vertically disposing a number of tubes between an upper tank and a lower tank, disposing outer fins among the tubes at a central portion excluding upper and lower end portions positioned near the upper and lower tanks of the tubes, and inserting inner fins into the tubes, two kinds of inner fins, that is, central inner fins inserted into the tube central portions and having high passage segmentation density, and end inner fins inserted to end portions free from the outer fins, and having thin passage segmentation density. <P>COPYRIGHT: (C)2009,JPO&INPIT |
