To provide a hydraulic drive device of an industrial vehicle which can prevent an operator from feeling that a steering wheel is stuck for a moment when conducting steering operation.SOLUTION: A hydraulic drive device 1 includes: a PS valve 6 disposed between a variable capacity pump 3 and a PS cylinder 5; a tilt valve 36 disposed between the variable capacity pump 3 and a tilt cylinder 8; a capacity control valve 4 which has an LS spool 47 for switching a direction, in which hydraulic oil flows, according to a differential pressure between a discharge pressure of the variable capacity pump 3 and a load pressure of the PS cylinder 5 or a handling cylinder 26 and controls the variable capacity pump 3; and a communication passage 81 which allows communication between a discharge port 49, to which the discharge pressure of the variable capacity pump 3 in the capacity control valve 4 is applied, and an LS port 50, to which the load pressure of the PS cylinder 5 or the handling cylinder 26 in the capacity control valve 4 is applied, when the discharge pressure of the variable capacity pump 3 becomes a predetermined pressure or higher.SELECTED DRAWING: Figure 1

    【課題】運転者がステアリング操作を行う際に感じる引っ掛かりを防止することができる産業車両の油圧駆動装置を提供する。【解決手段】油圧駆動装置1は、可変容量ポンプ3とPSシリンダ5との間に配置されたPSバルブ6と、可変容量ポンプ3とティルトシリンダ8との間に配置されたティルトバルブ36と、可変容量ポンプ3の吐出圧とPSシリンダ5または荷役シリンダ26の負荷圧との差圧に応じて作動油が流れる方向を切り換えるLSスプール47を有し、可変容量ポンプ3を制御する容量制御弁4と、可変容量ポンプ3の吐出圧が所定圧以上になったときに、容量制御弁4における可変容量ポンプ3の吐出圧が与えられる吐出ポート49と容量制御弁4におけるPSシリンダ5または荷役シリンダ26の負荷圧が与えられるLSポート50とを連通させる連通路81とを備える。【選択図】図1


    Access

    Download


    Export, share and cite



    Title :

    HYDRAULIC DRIVE DEVICE OF INDUSTRIAL VEHICLE


    Additional title:

    産業車両の油圧駆動装置


    Contributors:

    Publication date :

    2019-05-30


    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



    Hydraulic drive device for industrial vehicle

    UNO TAKASHI / YOKOMACHI NAOYA / UEDA YUKI et al. | European Patent Office | 2022

    Free access

    HYDRAULIC DRIVE DEVICE OF INDUSTRIAL VEHICLE

    KINOSHITA KOICHI | European Patent Office | 2020

    Free access

    HYDRAULIC DRIVE DEVICE FOR INDUSTRIAL VEHICLE

    UNO TAKASHI / YOKOMACHI NAOYA / UEDA YUKI et al. | European Patent Office | 2020

    Free access

    HYDRAULIC DRIVE DEVICE FOR INDUSTRIAL VEHICLE

    UNO TAKASHI / YOKOMACHI NAOYA / UEDA YUKI et al. | European Patent Office | 2019

    Free access

    HYDRAULIC DRIVE DEVICE OF INDUSTRIAL VEHICLE

    UNO MINESHI / YOKOMACHI NAOYA / UEDA SUKENORI et al. | European Patent Office | 2019

    Free access