| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pipe layer equipped with a turning speed control system which controls a maximum turning speed depending on the intended use. <P>SOLUTION: The pipe layer comprises variable displacement type first and second hydraulic pumps 2, 3 to be connected to an engine 1, a left side travel motor 4 and a boom cylinder 5 to be driven by the first hydraulic pump, control valves 7, 8 for controlling the flowing direction and amount of operating oil to the left side travel motor 4 and the boom cylinder 5, a right side travel motor 9, a turning motor 10 and a winch motor 11 to be driven by the second hydraulic pump, control valves 13, 14, 15 for controlling the flowing direction and amount of operating oil to the right side travel motor 9, the turning motor 10 and the winch motor 11, a travel straight valve 16 for supplying the operating oil from the first hydraulic pump to the boom cylinder, the turning motor and the winch motor and supplying the operating oil from the second hydraulic pump to the left side and right side travel motors, and a variable type load holding check valve 23 provided in an inlet side flow path 19 of the turning motor control valve 14 for controlling the amount of the operating oil to the turning motor. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
