| 摘要 |
Disclosed is a structure of an upper frame for supporting a cabin of construction machinery, whereby, in the event of a rollover accident, an excessive vertical load or rearward load applied to a cabin structure is primarily dispersed by a reinforcing member of the cabin structure, and the dispersed load is supported by a separate cabin supporting structure, so that the plastic deformation of the cabin structure can be minimized. The upper frame includes a center frame having a lower plate fitted with a swing ring gear, and a lateral plate vertically mounted on the lower plate and fitted with operation devices, such as a boom, an arm, or a bucket; and a left frame mounted on a left side of the center frame, and having a side channel extended in a longitudinal direction of the center frame, and a plurality of side frames for connecting the center frame with the side channel. The upper frame structure includes a first cabin supporting structure, mounted on the lower plate of the center frame, for supporting a vertical load and a rearward load applied to the cabin, and a second cabin supporting structure, mounted on one side of the side channel, for supporting an upper surface of the side channel when a vertical load and a rearward load are applied to the cabin.
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