Study On Mechanical Hydraulic Compound Drive System Of 5 Tons Off-road Forklift Truck

Due to the harsh operating environment of the majority of construction machinery,complicated working conditions,drastic changes in load,leading to low efficiency of transmission machinery and poor overall performance.Therefore,It will be more important that improving fuel efficiency and overall performance of the machine,so that the machine is an efficient,durable and comfortable overall performance.In this paper,off-road forklift of 5 tons for the object,to study its mechanical and hydraulic hybrid drive system performance parameters,the purpose is to reduce energy consumption of off-road forklift of 5 tons,and improve its overall performance.Mechanical hydraulic composite transmission system is a combination of the mechanical transmission system and hydraulic transmission system.In this paper,a mechanical hydraulic compound transmission device is designed,and the speed change mechanism,speed characteristic,equivalent ratio,smooth shift condition,torque characteristic,hydraulic power split ratio and efficiency of the device are analyzed and the key components and system mathematical model are made.In this paper,the key parameters of the mechanical hydraulic compound transmission system are matched,including the selection of the engine,the transmission ratio of the gearbox,the system pressure matching,the reasonable matching speed of the hydraulic components,the maximum traction calculation,the selection of the pump and the motor calculation,matching control of the pump and the engine and the matching of the pump and the motor.The calculation results show that the parameters are matched reasonably and the purpose of improving the comprehensive performance of the off-road forklift of 5 tons is achieved.Making the dynamic simulation of mechanical hydraulic hybrid drive system of off-road forklift of 5 tons by simulation software AMESim,which shows that the performance of the mechanical hydraulic compound transmission system has reached the theoretical requirement and improved the performance of the whole machine,which also reaches the expected effect.