Research On Driving System Of High Power Full Hydraulic Bulldozer

High-power bulldozers generally refer to bulldozers with more than 500 hp.They are mainly used in large-scale infrastructure projects,water conservancy construction,mining and other fields for rock stripping operations.They have complex structures,harsh working environments,large operating loads,large machine weights,and machine power requirements.Great features.At present,there is no high-power full-hydraulic bulldozer developed in China.In this paper,the following research is conducted with 565 k W(768hp)full-hydraulic bulldozer:(1)The power transmission scheme of the four-pump four-motor hydraulic driving system is proposed,the control principle of the hydraulic driving system is analyzed,and the electro-hydraulic proportional control is determined as the control method of the hydraulic component through comparison.(2)According to the load characteristics and the performance requirements of the whole machine,the parameters of the system components are matched,the maximum pressure of the hydraulic driving system is determined to be 45 Mpa,the rated pressure is 32.5Mpa,and the displacement of the Linde HMV-02 series is selected as 280ml/r hydraulic motor and HPV-02 series displacement 165ml/r hydraulic pump are the main components of the system.(3)The kinematics and dynamics analysis of the full hydraulic bulldozer is carried out,and the efficiency of the hydraulic pump and hydraulic motor is analyzed according to the test data,and it is concluded that the system pressure and the displacement ratio of the hydraulic components are the main factors that affect the efficiency.(4)According to the schematic diagram of the hydraulic driving system,the simulation model of the hydraulic driving system was established using AMEsim software.By applying different loads,the dynamic response analysis of the special operating conditions and main driving conditions of the bulldozer was carried out.The simulation results show that: when the bulldozer encounters special working conditions,the system runs smoothly;the bulldozer can stabilize at 2.6km/h in 2s during the starting phase and start smoothly;during the braking phase,the vehicle can move from 2.6km in 1.5s drops to zero,the system remains stable,so the design of the system is theoretically feasible.