In the run vibrating suppression hydraulic circuit null wheel type

摘要

PROBLEM TO BE SOLVED: To provide a hydraulic circuit for suppressing traveling vibrations of wheel type construction machines, which can obtain a stable vibration suppressing function in switching from a nonoperating state to an operating state.;SOLUTION: A one-way valve is provided in a first circuit for connecting an ejection circuit of a hydraulic pump and an accumulator together. Switching valves are provided on the first circuit, and among a second circuit which is connected to the bottom side of a boom hydraulic cylinder, a third circuit which is connected to the head side of the boom hydraulic cylinder, and a drain circuit which is connected to an oil storage tank. The switching valve, which has three positions, that is, a traveling position A, an accumulator decompression position B and a working position C, can move among the positions. A controller inputs detection values of first and second pressure sensors, operates the switching valve (32), and performs control so that hydraulic pressure of the accumulator and bottom pressure of the boom hydraulic cylinder can be constantly equal to each other.;COPYRIGHT: (C)2005,JPO&NCIPI