PROBLEM TO BE SOLVED: To provide a hydraulic circuit of a work machine, the hydraulic circuit providing excellent feeling of slewing operation.SOLUTION: The hydraulic circuit of a work machine according to the present invention comprises: a prime mover whose number of revolutions is determined based upon an operation command; a variable displacement hydraulic pump driven by the prime mover; a slewing motor driven with discharged oil from the variable displacement hydraulic pump; and a control valve controlling pressure oil supplied from the variable displacement hydraulic pump to the slewing motor. Further, the hydraulic circuit comprises: a number of revolutions signal generation part which generates the number of revolutions signal indicative of the number of revolutions of the prime mover; and a flow rate control valve controlling the flow rate of the pressure oil guided from the variable displacement hydraulic pump to the control valve, the flow rate control valve being configured to control the differential pressure across the control valve to a value corresponding to the number of revolutions of the prime mover according to the number of revolutions signal that the number of revolutions signal generation part outputs.SELECTED DRAWING: Figure 2
【課題】良好な旋回操作感を得る作業機械の油圧回路を提供する。【解決手段】本発明にかかる作業機械の油圧回路は、操作指令に基づき回転数が決定される原動機と、原動機により駆動される可変容量油圧ポンプと、可変容量油圧ポンプからの吐出油で駆動される旋回モータと、可変容量油圧ポンプから旋回モータへ供給される圧油を制御する制御弁とを備えた作業機械の油圧回路であって、原動機の回転数を表す回転数信号を生成する回転数信号生成部と、可変容量油圧ポンプから制御弁に導かれる圧油の流量を調節する流量調節弁と、を備え、流量調節弁は、回転数信号生成部が出力する回転数信号に基づき、制御弁の前後差圧を原動機の回転数に応じた値とすることを特徴とする。【選択図】図2
HYDRAULIC CIRCUIT OF WORK MACHINE
作業機械の油圧回路
2017-08-31
Patent
Elektronische Ressource
Japanisch
Europäisches Patentamt | 2020
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