PROBLEM TO BE SOLVED: To provide a hydraulic drive unit of a cargo handling vehicle which can operate the other actuator at a desired speed, and can descend a lifting-material lift at a desired descending speed when a descending operation of a lift hydraulic cylinder and an operation of the other hydraulic cylinder are simultaneously performed.SOLUTION: A bypass flow rate control valve 50 for controlling a flow rate of a working fluid which returns to a tank 19 from a lift operation lever 11 is arranged on hydraulic piping 49. In hydraulic piping 47, a regeneration flow rate control valve 80 for controlling a flow rate of the working fluid flowing to a hydraulic pump motor 17 from the lift operation lever 11 is arranged between a suction port 17a of the hydraulic pump motor 17 and a branch point 91. Since the descending operation and the operation of a hydraulic cylinder are simultaneously performed when a motor rotation number is raised more than that at single descending, the regeneration flow rate control valve 80 controls the flow rate of the working fluid, and an abrupt increase of a fork descending speed can be thereby suppressed.SELECTED DRAWING: Figure 2

    【課題】昇降用の油圧シリンダの下降操作と他の油圧シリンダの操作が同時に行われる場合に、他のアクチュエータを所望の速度で動作させるとともに昇降物リフトを所望の下降速度で下降させることができる荷役車両の油圧駆動装置を提供する。【解決手段】油圧配管49上には、リフト操作レバー11からタンク19に戻る作動油の流量を制御するバイパス用流量制御弁50が配設されている。また、油圧配管47において、油圧ポンプモータ17の吸込口17aと分岐点91との間には、リフト操作レバー11から油圧ポンプモータ17へ流れる作動油の流量を制御する回生用流量制御弁80が配設されている。下降操作と他の油圧シリンダの操作が同時に行われることで、単独下降時よりもモータ回転数が上がる場合、回生用流量制御弁80が作動油の流量を制御することにより、フォーク下降速度が急激に増加することを抑制できる。【選択図】図2


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    Title :

    HYDRAULIC DRIVE UNIT OF CARGO HANDLING VEHICLE


    Additional title:

    荷役車両の油圧駆動装置


    Contributors:

    Publication date :

    2017-06-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last



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