| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure for supporting a cylinder for turning of an arm, which can prevent a selvage part of a cylinder stay from spreading for deformation with grease supply without fixing a reinforcing material to an upper part of the selvage part. SOLUTION: This structure is provided in an ultra compact swing hydraulic excavator having the cylinder stay 9 which is coupled to an upper boom 5 so as to be swingable in a horizontal direction, an arm 10 which is coupled to the cylinder stay 9 so as to be turnable in a vertical direction, and the cylinder 8 for the turning of the arm 10, which drives the arm 10. The structure has a boss 32, which is provided in a cylinder tube 28 of the cylinder 8, and a trunnion pin 20 which is inserted into a closed-end hole 31 formed in the boss 32 and a hole formed in the selvage part 32 of the cylinder stay 9. The cylinder 8 is provided with the reinforcing material 35 for inhibiting extension of the selvage part 32. For example, the reinforcing material 35 is composed of a plate material having bent parts 36 disposed at both ends in such a manner as to face an external wall surface of the selvage part 32.
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