| 摘要 |
A lower frame and an upper frame, which configure a main frame, are connected to each other by a first reinforcing frame, a second reinforcing frame, a third reinforcing frame, a fourth reinforcing frame, a fifth reinforcing frame, and a sixth reinforcing frame. A first engine hanger is welded to a lower end of the lower frame such that an atmospheric air communicating hole formed in a side face of the first engine hanger communicates with the inside of the lower frame. A first air vent port and a second air vent port for the lower frame and the upper frame and third air vent port formed in a third reinforcing frame and a fourth reinforcing frame are formed in side faces of the abutting portions so that they are not observed from the outside. |
