PROBLEM TO BE SOLVED: To provide a hydraulic control device of a fork lift capable of improving responsiveness of a flow control valve.SOLUTION: A hydraulic control device is configured so that, a flow control valve 37 comprises a first pilot channel 51 and a second pilot channel 52. The first pilot channel 51 introduces pressure of an oil passage between a lift cylinder 14 and a lift drop proportional valve 32 on a first oil passage K1 to a first storage chamber 43 as pressure on an upstream side of the lift drop proportional valve 32. The second pilot channel 52 introduces pressure on an oil passage for flowing a hydraulic oil to a hydraulic pump through a branch point Q from the lift drop proportional valve 32 on the first oil passage K1, to a second storage chamber 46 as pressure on a downstream side of the lift drop proportional valve 32.SELECTED DRAWING: Figure 4

    【課題】流量制御弁の応答性を向上させることができるフォークリフトの油圧制御装置を提供すること。【解決手段】油圧制御装置において、流量制御弁37は、第1パイロット流路51と第2パイロット流路52を備える。第1パイロット流路51は、第1油路K1におけるリフトシリンダ14とリフト下降用比例弁32との間の油路の圧力を、リフト下降用比例弁32の上流側の圧力として第1収容室43に導入する。第2パイロット流路52は、第1油路K1におけるリフト下降用比例弁32から分岐点Qを通過して油圧ポンプに作動油を流す油路の圧力を、リフト下降用比例弁32の下流側の圧力として第2収容室46に導入する。【選択図】図4


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    Title :

    HYDRAULIC CONTROL DEVICE OF FORK LIFT


    Additional title:

    フォークリフトの油圧制御装置


    Contributors:

    Publication date :

    2016-12-01


    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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