HYDRAULIC CONTROL DEVICE FOR FORKLIFT

摘要

This hydraulic control device for a forklift includes a hydraulic pump, a single electric motor for driving the hydraulic pump, an outflow control mechanism provided between a lift cylinder and the hydraulic pump, a flow rate control valve provided between the outflow control mechanism and a drain unit, and a control unit. When a lowering operation for a fork and either a forward or a rearward tilting operation for a mast are performed at the same time, the control unit controls the electric motor on the basis of a target speed of the hydraulic pump that is necessary for causing operation at an instructed speed that is in accordance with the operation amount of a raising/lowering instruction member or the operation amount of a tilting instruction member. The flow rate control valve controls the flow rate of hydraulic oil from the lift cylinder to the hydraulic pump and the flow rate from the lift cylinder to the drain unit in accordance with the difference between the actual speed of the hydraulic pump and the target speed of the hydraulic pump that is necessary for lowering at the instructed speed for the operation amount of the raising/lowering instruction member.