A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HYDRAULIC DRIVE UNIT OF CONSTRUCTION MACHINE
PROBLEM TO BE SOLVED: To reduce a shock at the activation of a hydraulic actuator, to suppress the vibration of a vehicle body at a stop of the hydraulic actuator, to obtain an effect of the improvement of fuel economy at the activation of a traveling hydraulic motor, and to suppress a response delay before the hydraulic actuator starts to be activated at the activation of the hydraulic actuator, in a construction machine of a special specification in which the moment of a front working device is larger than that of a standard machine.SOLUTION: Throttles are arranged at an original pressure line and an output line of a first variable pressure reduction valve of a shuttle block SB, slow return valves 46 to 49 are arranged at front control pilot pressure lines PL1 to PL4, and first and second correction pump control pressure SAm, SBm are generated by selecting high-pressure sides of first and second pump control pressure SA, SB which are created by the shuttle block SB, and turning brake release pressure, and introduced to regulators R1, R2 of the first and second hydraulic pumps P1, P2.SELECTED DRAWING: Figure 1
【課題】フロント作業装置のモーメントが標準機よりも大きい特殊仕様の建設機械において、油圧アクチュエータ起動時のショックを低減し、油圧アクチュエータ停止時の車体振動を抑制し、走行用の油圧モータの起動時に燃費改善の効果が得られ、しかも油圧アクチュエータ起動時に油圧アクチュエータが動き出すまでの間の応答遅れを抑制する。【解決手段】シャトルブロックＳＢの第１可変減圧弁の元圧ラインと出力ラインに絞りを設け、フロント用の制御パイロット圧ラインＰＬ１〜ＰＬ４にスローリターンバルブ４６〜４９を設け、シャトルブロックＳＢで生成した第１及び第２ポンプコントロール圧ＳＡ，ＳＢと旋回ブレーキ解除圧の高圧側を選択して第１及び第２補正ポンプコントロール圧ＳＡｍ、ＳＢｍを生成し、第１及び第２油圧ポンプＰ１，Ｐ２のそれぞれのレギュレータＲ１，Ｒ２に導く。【選択図】図１
HYDRAULIC DRIVE UNIT OF CONSTRUCTION MACHINE
PROBLEM TO BE SOLVED: To reduce a shock at the activation of a hydraulic actuator, to suppress the vibration of a vehicle body at a stop of the hydraulic actuator, to obtain an effect of the improvement of fuel economy at the activation of a traveling hydraulic motor, and to suppress a response delay before the hydraulic actuator starts to be activated at the activation of the hydraulic actuator, in a construction machine of a special specification in which the moment of a front working device is larger than that of a standard machine.SOLUTION: Throttles are arranged at an original pressure line and an output line of a first variable pressure reduction valve of a shuttle block SB, slow return valves 46 to 49 are arranged at front control pilot pressure lines PL1 to PL4, and first and second correction pump control pressure SAm, SBm are generated by selecting high-pressure sides of first and second pump control pressure SA, SB which are created by the shuttle block SB, and turning brake release pressure, and introduced to regulators R1, R2 of the first and second hydraulic pumps P1, P2.SELECTED DRAWING: Figure 1
【課題】フロント作業装置のモーメントが標準機よりも大きい特殊仕様の建設機械において、油圧アクチュエータ起動時のショックを低減し、油圧アクチュエータ停止時の車体振動を抑制し、走行用の油圧モータの起動時に燃費改善の効果が得られ、しかも油圧アクチュエータ起動時に油圧アクチュエータが動き出すまでの間の応答遅れを抑制する。【解決手段】シャトルブロックＳＢの第１可変減圧弁の元圧ラインと出力ラインに絞りを設け、フロント用の制御パイロット圧ラインＰＬ１〜ＰＬ４にスローリターンバルブ４６〜４９を設け、シャトルブロックＳＢで生成した第１及び第２ポンプコントロール圧ＳＡ，ＳＢと旋回ブレーキ解除圧の高圧側を選択して第１及び第２補正ポンプコントロール圧ＳＡｍ、ＳＢｍを生成し、第１及び第２油圧ポンプＰ１，Ｐ２のそれぞれのレギュレータＲ１，Ｒ２に導く。【選択図】図１
HYDRAULIC DRIVE UNIT OF CONSTRUCTION MACHINE
建設機械の油圧駆動装置
OKUYA SO (author) / KUDO TAKEMASA (author)
2017-11-30
Patent
Electronic Resource
Japanese