To provide a hydraulic system of an industrial vehicle capable of controlling the capacity of a cargo handling pump through positive control and properly controlling the capacity of a steering pump.SOLUTION: A hydraulic system 1 includes: a variable capacity type steering pump 21 that supplies a working fluid to a steering actuator 11; a variable capacity type cargo handling pump 31 that supplies the working fluid to at least one cargo handling actuator 12; and a confluence line 71 that branches out from a steering supply line 22 and leads to a cargo handling supply line 32. Further, the hydraulic system 1 includes: a cargo handling regulator 5 that is inputted with a cargo handling request command pressure and augments a capacity of the cargo handling pump 31 as the cargo handling request command pressure increases; and a steering regulator 4 that is inputted with a higher one of a steering negative pressure and a cargo handling negative pressure as a load sensing pressure, and controls the capacity of the steering pump 21 so that a difference pressure between the load sensing pressure and a discharge pressure of the steering pump 21 is maintained to be constant.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、ステアリング負荷圧と荷役負荷圧のうちの高い方がロードセンシング圧として入力され、前記ロードセンシング圧とステアリングポンプ21の吐出圧との差圧が一定となるようにステアリングポンプ21の容量を制御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 :

    2023-06-05


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



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