| 摘要 |
PROBLEM TO BE SOLVED: To disperse excavation reaction and weight load to the whole of a revolving frame by extending a pair of the right and left vertical ribs from a front boom bracket section to a rear weight fitting section, and widening the lateral width toward the rear side. SOLUTION: A pair of the right and left vertical ribs 24, 25 extended in the longitudinal direction from a front room bracket section 12 to a rear weight fitting section 29 and widened in the lateral width toward the fitting section 29 side are fixed on a frame base plate 23 by welding. A vertical plate 32 is extended in the lateral direction on the parallel portions of the vertical ribs 24, 25 to cross the extending direction on the front side of an engine room 6. A pair of the right and left vertical ribs 24, 25 are extended from the front bracket section 12 to the rear fitting section 29, excavation reaction and the load of a weight 11 can be dispersed to the whole of a revolving frame 4, and an engine 5 can be stably mounted at a wide-lateral width portion.
|
