Study On The Front-wheel Driving System Based On Load-sensing Techniques For 215 Hp Motor Graders

Front-wheel driving technology is one of the important means of improving the traction capacity of motor graders.By taking full advantage of the front-wheel quality,it can provide auxiliary traction for the whole machine,thus expanding the scope of work of the motor graders,especially the mining area.At present,the research on the front-wheel driving technology of the graders is not enough.Therefore,it is important to study the key issues such as system design,parameter matching,synchronization and efficiency improvement.The study on the front-wheel driving technology is of great practical significance to design and develop the new motor graders.In this paper,the front-wheel driving system is studied and designed based on the 215 Hp motor graders.Based on the comparative analysis of three different front-wheel driving schemes and the efficiency analysis of the load-sensing system,a scheme of front-wheel hydraulic driving system based on load-sensing variable pump is proposed.The key technologies of load-sensing variable pump,multi-way valve and free wheels valve are applied to solve the issues of front and rear wheels synchronization,the front wheels synchronization and free wheels.According to the parameters of 215 Hp motor graders,the key parameters of kinematics and dynamics are determined.The parameters of hydraulic system are matched and calculated.The selection and checking of key components such as hydraulic pump and motor are completed,and the traction characteristics are studied and calculated.Based on AMESim software,the model and simulation of the front-wheel load-sensing driving system for motor graders are established.The dynamic response of the system under different working conditions is analyzed.The synchronization performance of the left and right wheels under the partial load conditions is discussed.The energy consumption and efficiency of the system under different working conditions are evaluated.The working efficiency of the two load-sensing systems is compared.The simulation results further validate the feasibility of the front-wheel driving system.