LOWER STRUCTURE OF MOBILE CRANE

摘要

PROBLEM TO BE SOLVED: To provide a lower structure of an improved mobile crane capable of overcoming a defect in current technology and further advantageously improving the current technology. SOLUTION: This lower structure of the mobile crane has a crawler type travelling device furnished with a chassis frame 4 and four independent crawler type travelling parts 5 held by a bearing arranged on the chassis frame 4. The lower part structural body 1 of the mobile crane has a characteristic feature that the chassis frame 4 is furnished with two lateral direction girders 7, one of the crawler type travelling parts 5 is respectively mounted on each of end parts of the both lateral direction girders 7 and the chassis frame 4 is further furnished with a frame central part 6 to connect the both lateral direction girders 7 to each other. COPYRIGHT: (C)2004,JPO&NCIPI