| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a track frame for construction machinery, which can be easily manufactured even when the horizontal width of a center frame is small relative to the cylindrical portion of the center frame, and which can reduce the number of components constituting a connecting portion. Ž<P>SOLUTION: First connecting plates 7 for connecting a side frame 2 are provided in front and rear positions on both the right and left sides of the center frame 1, respectively. The first connecting plate 7 is elongated to a position in which its inner end is located on the inside with respect to the right and left outer ends of a cylindrical portion 4. Second connecting plates 10 are provided protrusively inward inside the side frame 2 in such a manner that the two second connecting plates constitute one set in the sate of sandwiching the first connecting plate 7. The second connecting plate 10, connecting pins 13 and 14, which are detachably inserted into each pin hole of the first connecting plate 7 sandwiched between the second connecting plates 10, and a hydraulic cylinder 15 for inserting/extracting the connecting pin are provided between each of the sets of second connecting plates 10 in the front and rear positions of each of the side frames 2. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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