To provide a hydraulic drive unit for a cargo handling vehicle capable of suppressing pressure rise in a bottom chamber of a tilt cylinder at the forward tilting time of a mast with a low loaded state while preventing the bottom chamber of the tilt cylinder from being negative pressure at the forward tilting time with a high loaded state.SOLUTION: A hydraulic drive unit 1 comprises: a motor 9 to rotate a hydraulic pump 8; a directional control valve 10 arranged between the hydraulic pump 8 and a tilt cylinder 6; a throttle portion 17 to generate pressure loss in a channel between a rod chamber 6b of the tilt cylinder 6 and a tank 7; a holding pressure acquisition unit 21 to acquire the tilt cylinder holding pressure corresponding to pressure acting on the tilt cylinder 6 by the load of a load L; a command rotation speed setting unit 22 to set the command rotation speed of the motor 9 according to the tilt cylinder holding pressure; and a motor control unit 23 to control the motor 9 according to the command rotation speed. The command rotation speed setting unit 22 sets the command rotation speed higher as the tilt cylinder holding pressure becomes higher.SELECTED DRAWING: Figure 1

    【課題】高負荷状態でのマストの前傾時にティルトシリンダのボトム室圧力が負圧になることを防止しつつ、低負荷状態でのマストの前傾時におけるティルトシリンダのボトム室の圧力上昇を抑えることができる荷役車両油圧駆動装置を提供する。【解決手段】油圧駆動装置1は、油圧ポンプ8を回転させるモータ9と、油圧ポンプ8とティルトシリンダ6との間に配設された方向切換弁10と、ティルトシリンダ6のロッド室6bとタンク7との間の流路に圧力損失を発生させる絞り部17と、荷物Lの荷重によりティルトシリンダ6に作用する圧力であるティルトシリンダ保持圧を取得する保持圧取得部21と、ティルトシリンダ保持圧に応じたモータ9の指令回転数を設定する指令回転数設定部22と、指令回転数に応じてモータ9を制御するモータ制御部23とを備え、指令回転数設定部22は、ティルトシリンダ保持圧が高くなるほど指令回転数を高く設定する。【選択図】図1


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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 :

    2019-02-28


    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 / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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