| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce the pressure loss of hydraulic oil supplied to a boom cylinder without greatly changing a position connected to a hydraulic hose connected to the boom cylinder. SOLUTION: First branch pipes 53A and 53B and second branch pipes 54A and 54B which branch off from common pipes 52A and 52B of pieces 50A and 50B of hydraulic piping for a boom are connected to the right and left boom cylinders via the hydraulic hoses 73A, 73B, 74A and 74B. The branch pipes 53A and 53B are formed in such shapes as to be directed forward from branches 56A and 56B, and front ends of the branch pipes 53A and 53B are provided with hose connecting parts 58. The branch pipes 54A and 54B are formed in such shapes as to be elongated to other sides of the common pipes 52A and 52B from the branches 56A and 56B, and ends of the branch pipes 54A and 54B are provided with the hose connecting parts 58 directed forward. The common pipes 52A and 52B are made obliquely incident inward from the horizontal outside with respect to the branches 56A and 56B, so that both an angle between the branch pipes 53A and 53B and an angle between the branch pipes 54A and 54B can exceed 90°. COPYRIGHT: (C)2007,JPO&INPIT
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