| 摘要 |
The present invention relates to an electromotive forklift truck, comprising: an electronic device which operates by means of a motor when a working machine is moving upward and which operates by means of a generator when the working machine is moving downward; a hydraulic pump motor which performs the two functions of a hydraulic pump and a hydraulic motor; a main control valve device including a lift-cylinder-operating unit for operating a lift cylinder, and a secondary-consumer-operating unit for operating a secondary consumer; and a control lever including a control valve for controlling the lift cylinder or the secondary consumer via the lift-cylinder-operating unit or the secondary-consumer-operating unit of the main control valve device, respectively. The electromotive forklift truck further comprises a working-oil return line having a flow-limiting valve for controlling the flow of the oil returning from the lift cylinder when the working machine is moving downward. The working-oil return line includes an energy recovery unit which, if the volume of the oil returning from the lift cylinder when the working machine is moving downward is less than the volume of oil consumed by the secondary consumer, recovers the oil to the oil tank, and which, if the volume of the oil returning from the lift cylinder when the working machine is moving downward is more than the volume of oil consumed by the secondary consumer, guides the oil to the hydraulic pump motor. |
