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A platform for research: civil engineering, architecture and urbanism
HYDRAULIC DRIVING DEVICE FOR WORK MACHINE
PROBLEM TO BE SOLVED: To provide a hydraulic driving device for a work machine having operability corresponding to a load change of a front work machine caused by load or the like when performing an operation for moving the front work machine downwards in the work machine configured to recover/regenerate energy by accumulating the energy in an accumulator.SOLUTION: A hydraulic driving device 5 comprises a main pump 101, a boom cylinder 3, a tank 20, a flow control valve 6 and an accumulator 300. The hydraulic driving device also comprises: a first differential pressure control valve 201 which is disposed between the boom cylinder and the accumulator and controls a discharge oil from the boom cylinder in such a manner that a differential pressure before and behind the flow control valve becomes a target differential pressure; and a second differential pressure control valve 202 which is disposed between the accumulator and the tank and controls the discharge oil in such a manner that a differential pressure between an upstream pressure and a downstream pressure including the flow control valve and the first differential pressure control valve becomes a target differential pressure. The first and second differential pressure control valves are configured to increase the target differential pressure in response to increase in the pressure of the discharge oil.SELECTED DRAWING: Figure 2
【課題】蓄圧器にエネルギを蓄圧してエネルギを回収・回生する作業機械において、フロント作業機を下げる動作を行う際に、積荷等によるフロント作業機の荷重変化に対応した操作性を持った作業機械の油圧駆動装置を提供する。【解決手段】メインポンプ１０１と、ブームシリンダ３と、タンク２０と、流量制御弁６と、アキュムレータ３００と、を備えた油圧駆動装置５において、ブームシリンダとアキュムレータとの間に配置され、ブームシリンダからの排出油に対して、流量制御弁の前後差圧が目標差圧になるように制御する第１差圧制御弁２０１と、アキュムレータとタンクとの間に配置され、排出油に対して、流量制御弁及び第１差圧制御弁を含めた上流圧と下流圧との差圧が目標差圧になるように制御する第２差圧制御弁２０２と、を有し、第１及び第２差圧制御弁は、排出油の圧力の増加に応じて目標差圧が大きくなるように構成されている。【選択図】図２
HYDRAULIC DRIVING DEVICE FOR WORK MACHINE
PROBLEM TO BE SOLVED: To provide a hydraulic driving device for a work machine having operability corresponding to a load change of a front work machine caused by load or the like when performing an operation for moving the front work machine downwards in the work machine configured to recover/regenerate energy by accumulating the energy in an accumulator.SOLUTION: A hydraulic driving device 5 comprises a main pump 101, a boom cylinder 3, a tank 20, a flow control valve 6 and an accumulator 300. The hydraulic driving device also comprises: a first differential pressure control valve 201 which is disposed between the boom cylinder and the accumulator and controls a discharge oil from the boom cylinder in such a manner that a differential pressure before and behind the flow control valve becomes a target differential pressure; and a second differential pressure control valve 202 which is disposed between the accumulator and the tank and controls the discharge oil in such a manner that a differential pressure between an upstream pressure and a downstream pressure including the flow control valve and the first differential pressure control valve becomes a target differential pressure. The first and second differential pressure control valves are configured to increase the target differential pressure in response to increase in the pressure of the discharge oil.SELECTED DRAWING: Figure 2
【課題】蓄圧器にエネルギを蓄圧してエネルギを回収・回生する作業機械において、フロント作業機を下げる動作を行う際に、積荷等によるフロント作業機の荷重変化に対応した操作性を持った作業機械の油圧駆動装置を提供する。【解決手段】メインポンプ１０１と、ブームシリンダ３と、タンク２０と、流量制御弁６と、アキュムレータ３００と、を備えた油圧駆動装置５において、ブームシリンダとアキュムレータとの間に配置され、ブームシリンダからの排出油に対して、流量制御弁の前後差圧が目標差圧になるように制御する第１差圧制御弁２０１と、アキュムレータとタンクとの間に配置され、排出油に対して、流量制御弁及び第１差圧制御弁を含めた上流圧と下流圧との差圧が目標差圧になるように制御する第２差圧制御弁２０２と、を有し、第１及び第２差圧制御弁は、排出油の圧力の増加に応じて目標差圧が大きくなるように構成されている。【選択図】図２
HYDRAULIC DRIVING DEVICE FOR WORK MACHINE
作業機械の油圧駆動装置
ITO MASAMICHI (author) / OKI TAKATOSHI (author)
2018-09-27
Patent
Electronic Resource
Japanese