| 摘要 |
PROBLEM TO BE SOLVED: To reduce atmosphere communication holes for releasing air expanded by welding to thereby improve appearance, while preventing entry of rainwater or paint during painting, concerning a main frame assembled by welding many pipe members.SOLUTION: A lower frame 17 and an upper frame 18 constituting a main frame 7 are connected by first, second, third, fourth, fifth and sixth reinforcing frames 21, 22, 23, 24, 25, 26. At a lower end of the lower frame 17, a first engine hanger 11 is welded. An atmosphere communication hole 30 formed on the side surface of the first engine hanger 11 communicates with the inside of the lower frame 17. First and second air vent holes 31, 32 corresponding to the lower and upper frames 17, 18 and a third air vent hole 33 formed in the third and fourth reinforcing frames 23, 24 are formed on the side surface of a contact part, so as not to impair the appearance. |
