A hydraulic drive device includes a resistance element disposed closer to the lift cylinder than the operation valve in the lowering oil path and increasing the fluid resistance. In addition, a pilot flow path of a bypass flow rate control valve is connected between the lift cylinder and the resistance element in the lowering oil path. With such a configuration, it is possible to add the pressure loss generated in the resistance element to the pilot pressure of the bypass flow rate control valve. Therefore, the pilot pressure can be increased by the addition of the pressure loss of the resistance element. By increasing the pilot pressure in this manner, it is possible to reduce the influence of the disturbance which makes the operation of the bypass flow rate control valve unstable.
HYDRAULIC DRIVE DEVICE FOR CARGO VEHICLE
HYDRAULISCHE ANTRIEBSVORRICHTUNG FÜR EIN FRACHTFAHRZEUG
DISPOSITIF D'ENTRAÎNEMENT HYDRAULIQUE POUR VÉHICULE DE CHARGEMENT
2022-04-06
Patent
Elektronische Ressource
Englisch
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 |