PROBLEM TO BE SOLVED: To provide a hydraulic circuit structure capable of suppressing the increase of hydraulic pressure in a closed circuit.SOLUTION: The hydraulic circuit structure includes: a steering mode valve 47 changeable to the first state of permitting the flowing-in/out of hydraulic oil to oil supply/discharge paths 61 to 64 and the second state of regulating the flowing-in/out of hydraulic oil to the oil supply/discharge paths 63 and 64; a double pilot check valve 73 for blocking the flowing-out of hydraulic oil from the oil supply/discharge paths 63 and 64 when the steering mode valve 47 is in the second state; an accumulator 51 for pressure-accumulating the hydraulic oil by the increase of hydraulic pressure in the oil supply/discharge path 64 and discharging the hydraulic oil by the reduction of hydraulic pressure in the oil supply/discharge path 64; a relief valve 52 for distributing the hydraulic oil from the oil supply/discharge path 64 side to the accumulator 51 side when the hydraulic pressure of the oil supply/discharge path 64 side is higher by predetermined pressure than the hydraulic pressure of the accumulator 51; and a check valve 53 for permitting the distribution of the hydraulic oil from the accumulator 51 side to the oil supply/discharge path 64 and blocking reverse-flowing.SELECTED DRAWING: Figure 2
【課題】閉塞回路内の油圧の上昇を抑制した油圧回路構造を提供する。【解決手段】油圧回路構造は、給排油路61〜64に対する作動油の流出入を許容する第1状態、及び給排油路63、64に対する作動油の流出入を規制する第2状態に状態変化が可能なステアモードバルブ47と、ステアモードバルブ47が第2状態のときに給排油路63、64からの作動油の流出を阻止するダブルパイロットチェックバルブ73と、給排油路64内の油圧の上昇によって作動油を蓄圧し、給排油路64内の油圧の低下によって作動油を排出するアキュームレータ51と、給排油路64側の油圧がアキュームレータ51の油圧より所定圧以上高いときに、給排油路64側からアキュームレータ51側へ作動油を流通させるリリーフバルブ52と、アキュームレータ51側から給排油路64側への作動油の流通を許容し且つ逆流を阻止するチェックバルブ53とを備える。【選択図】図2
HYDRAULIC CIRCUIT STRUCTURE AND WORK VEHICLE
油圧回路構造及び作業車両
2016-08-08
Patent
Elektronische Ressource
Japanisch
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 |
Europäisches Patentamt | 2020
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