Apparatus for controlling pressure oil supply amount of vehicle-mounted crane and vehicle mounted type crane equipped with the same

摘要

PROBLEM TO BE SOLVED: To provide a pressure oil supply amount control device for a vehicle mounted type crane, capable of providing a more energy-saving effect.SOLUTION: The pressure oil supply amount control device is used for a vehicle mounted type crane including a main hydraulic pump 7 and a sub-hydraulic pump 8 simultaneously driven by the engine 6 of a vehicle. A controller 2 determines the size of a load based on the load information of a suspended load obtained from a load detector 19, increases, when the load is determined to be large, the rotational speed of the engine 6 from the stage of a crane operation amount smaller than that when the load is determined to be small, then merges pressure oil adjusted by a flow control valve 5 with pressure oil discharged from the main hydraulic pump 7, merges, when the load is determined to be small, the pressure oil adjusted by the flow control valve 5 with the pressure oil discharged from the main hydraulic pump 7 from the stage of a crane operation amount smaller than that when the load is determined to be large, and then increases the rotational speed of the engine 6.SELECTED DRAWING: Figure 2