| 摘要 |
PROBLEM TO BE SOLVED: To suppress mud soil or the like from being deposited on an upper surface of a leg part and to enhance joint strength of a leg part and a central frame. SOLUTION: A left front leg part lower plate 13B is integrally formed with a bottom plate 13, a left front inclination plate part 19B is provided on an upper plate 19, and a left front leg part upper plate 21 is fixed to the left front inclination plate part 19B and a pair of left front leg part side plates 15 erected on the left front leg part lower plate 13B. Thereby, a left front leg part 25 with a strong box structure surrounded by the left front leg part lower plate 13B, the left front leg part side plates 15, the left front leg part upper plate 21, etc. can be formed, and the joint strength of the left front leg part 25 to the central frame 12 can be enhanced. Further, since the left front leg part upper plate 21 has a crest-like inclination surface 21A inclined in front/rear direction making a ridge line part 21B as an apex part, the mud soil or the like can be suppressed from being deposited on the left front leg part 25 and a left side frame 29 by dropping off the mud soil or the like along the inclination surface 21A in the front/rear direction. COPYRIGHT: (C)2008,JPO&INPIT
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