To provide a hydraulic system of an industrial vehicle which can control a capacity of a cargo handling pump by positive control and properly control a capacity of a steering pump.SOLUTION: A hydraulic system 1 includes: a variable capacity type steering pump 21 which supplies hydraulic fluid to a steering actuator 11; a variable capacity type cargo handling pump 31 which supplies hydraulic fluid to at least one cargo handling actuator 12; a confluence line 71 which is branched from a steering supply line 22 and is connected to a cargo handling supply line 32; and a priority valve 72 which is provided in the confluence line 71. Furthermore, the hydraulic system 1 includes: a cargo handling regulator 5 to which cargo handling request command pressure is input and which increases a capacity of the cargo handling pump 31 as the cargo handling request command pressure is increased; and a steering regulator 4 to which higher one of steering request command pressure and the cargo handling request command pressure is input as signal pressure and which increases a capacity of the steering pump 21 as the signal pressure is increased.SELECTED DRAWING: Figure 1

    【課題】荷役ポンプの容量をポジティブ制御で制御するとともにステアリングポンプの容量を適切に制御することができる産業車両の油圧システムを提供する。【解決手段】油圧システム1は、ステアリングアクチュエータ11へ作動油を供給する可変容量型のステアリングポンプ21と、少なくとも1つの荷役アクチュエータ12へ作動油を供給する可変容量型の荷役ポンプ31と、ステアリング供給ライン22から分岐して荷役供給ライン32につながる合流ライン71と、合流ライン71に設けられた優先弁72を含む。さらに、油圧システム1は、荷役要求指令圧が入力され、荷役要求指令圧が大きくなるほど荷役ポンプ31の容量を増加する荷役レギュレータ5と、ステアリング要求指令圧と荷役要求指令圧のうちの高い方が信号圧として入力され、前記信号圧が大きくなるほどステアリングポンプ21の容量を増加するステアリングレギュレータ4を含む。【選択図】図1


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    Title :

    HYDRAULIC SYSTEM OF INDUSTRIAL VEHICLE


    Additional title:

    産業車両の油圧システム


    Contributors:

    Publication date :

    2023-05-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge / 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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