| 摘要 |
PROBLEM TO BE SOLVED: To provide an upper body of a mobile crane which reduces a maximum value of a bearing bolt axial force without needing to increase a plate thickness of a bearing seating surface.SOLUTION: An upper body 30 includes: a revolving frame 40; a bearing seating surface 50 which is fixed to an upper surface (a surface at the upper side Z1) of a revolving bearing and the revolving frame 40; and force dispersion means 60. The force dispersion means 60 is disposed between a side plate 42 of the revolving frame 40 and the bearing seating surface 50 and is formed to disperse a force transmitted from the side plate 42 to the bearing seating surface 50 in multiple paths. The force dispersion means 60 includes a vertical plate 63 extending in a vertical direction. The vertical plate 63 is fixed to the bearing seating surface 50 so as to avoid a force dispersion object area 55. |
