To provide a hydraulic driving device of a forklift capable of switching a switching valve at a position to displace a cargo handling device without operating a hydraulic pump and capable of suppressing energy consumption.SOLUTION: A hydraulic driving device of a forklift comprises: a pump side pilot flow passage 52 branching between a switching valve and a hydraulic cylinder in a first hydraulic oil flow passage, and connected to a pilot chamber; and an electromagnetic on-off valve installed in the pump side pilot flow passage 52 and opened/closed according to the operation of a displacement operation part. The hydraulic driving device actuates the hydraulic cylinder by the self-weight of a cargo handling device when the electromagnetic on-off valve is opened, and switches the switching valve by passing the hydraulic oil discharged from the hydraulic cylinder through the pilot chamber.SELECTED DRAWING: Figure 2
【課題】油圧ポンプを作動させることなく荷役装置を変位させる位置に切換弁を切り換えでき、エネルギー消費を抑制することが可能なフォークリフトの油圧駆動装置の提供にある。【解決手段】第1作動油流路における油圧シリンダと切換弁との間から分岐され、パイロット室に接続されるポンプ側パイロット流路52と、ポンプ側パイロット流路52に設けられ、変位操作部の操作に応じて開閉される電磁開閉弁と、を備え、電磁開閉弁が開くとき、荷役装置の自重により油圧シリンダを作動させ、油圧シリンダから排出される作動油をパイロット室へ通すことにより切換弁を切り換える。【選択図】 図2
HYDRAULIC DRIVING DEVICE OF FORKLIFT
フォークリフトの油圧駆動装置
2020-06-18
Patent
Electronic Resource
Japanese
IPC: | F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / 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 |