This hydraulic control device for a forklift is equipped with: a plurality of hydraulic mechanisms including a raising/lowering hydraulic cylinder (14) and a tilting hydraulic cylinder (19); a hydraulic pump (30); an electric motor (31); a discharge control mechanism (32); a proportional valve (36); a flow control valve (35); and a control unit (S). When simultaneously performing a fork-lowering operation using the raising/lowering hydraulic cylinder (14) and another operation using a hydraulic mechanism other than the raising/lowering hydraulic cylinder (14), the control unit (S) controls the aperture of the proportional valve (36) according to the difference in rotations between the: number of required lowering-operation rotations of the hydraulic pump (30) which are required in order to perform the lowering operation at an indicated speed according to the operation amount of a raising/lowering indication member, and the number of required other-operation rotations of the hydraulic pump (30) which are required in order to perform the other operation.


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    Title :

    Hydraulic control device for forklift


    Contributors:

    Publication date :

    2015-10-28


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    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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