Study On The Front-wheel Driving System Of190hp Hydrostatic Motor Graders

As an form of auxiliary driving for grader, the front-wheel driving has the functions ofimproving traction force, expanding the using range, high-precision flat soil, etc. The study ofthe front-wheel driving technology is one of the important means to develop the modernmotor graders to multi-purpose and high-performance.In this paper, by analyzing and comparing three different front-wheel driving systemstructural models, the front-wheel hydraulic driving system of the190hp hydrostatic grader isstudied, and the hydraulic driving system scheme of using a load-sensing variable pump isproposed. The system’s static parameters are matched and calculated, and the majorcomponents are selected and checked. The impacts and causes of synchronized travelingperformance to the loss of traction force and operating efficiency in constant speed areanalyzed. The boundary condition of the loss of traction force without synchronizationfunction comparing to which with it is given. The relationship function between the loss oftraction force and the parameters of the value, the acting angle and the acting point of thebiased load and the steering angle of the front wheel are derived. Based on AMESim software,the model of the front-wheel hydraulic driving system is established and simulated, and thesynchronization performance under the sinusoidal loads, the system response to the biasedload under the step loads and ramp loads are simulated. The simulation result shows that thesystem pressure is stable, the left and right motors have ideal synchronous performance andthe scheme is feasible. The research of the front-wheel hydraulic driving system can be takenas reference for the design of other similar systems.