| 摘要 |
PROBLEM TO BE SOLVED: To enable a boom cylinder to be easily equipped with an accumulator, and to enable the accumulator to be protected by a cylinder fitting part.SOLUTION: A base part 4 of a boom 3 is pivoted to a boom support 2; a middle part 5 of the boom 3 is bent in a ridge shape in side view, and a cylinder fitting part 7 having left and right side wall parts 7a in the state of being projected downward are provided in a bent part 6; the side of a bottom part 9a of a cylinder tube 9 of a boom cylinder 8 is connected to the cylinder fitting part 7; and a piston rod 10 of the boom cylinder 8 is connected to the boom support 2. In the inside sandwiched between the left and right side wall parts 7a of the cylinder fitting part 7, an accumulator 11 communicating with an oil chamber in the cylinder tube 9 is provided at the bottom part 9a of the cylinder tube 9 in a concentric manner. |
