Research On The Performance And Tests Of Vehicle Multi-plate Limited Slip Differential For The Firction-type

In recent years, with the development of automobile industry in China, more andmore attention has been paid to the car’s active safety, controllability and stability,power performance, passing ability, etc. As an important component to improve theperformance of a car, the limited slip differential has been widely used all over theworld. The limited slip differential can improve “ordinary differential torque evenlydistributed features”, so that it can improve the adoption of the car on thedouble-adhesion coefficient road. It is also helpful to vehicle controllability andstability when they are turning around. At present, in China, research on limited-slipdifferential is still far behind that in those developed countries, no self-developedlimited slip differential products are used. Therefore, to design and develop a type oflimited slip differential with our own authority is significant for the furtherdevelopment of China’s automobile industry.In this paper, according to the research project “vehicle performance testing forvehicle with multi-plate limited slip differential for friction-type,” the author did deepstudy on the performances of the limited slip differential and the influence it has onvehicle controllability and stability. In this paper, the following items are included:1. Research on the principle of limited slip differential. Speed characteristics andtorque characteristics of ordinary differential and limited slip differential are analyzedin this paper. There are classifications of limited slip differential according to thestructure and working principle; Give a brief introduction to the advantages anddisadvantages of different types of limited slip differential, predict the futuredevelopment trend of the limited slip differential.2. Analyze the structure of the limited slip differential. Compared with ordinarydifferential, we know the particular structure in Limited slip differential. Focus on the parts that impact limited-slip differential performance for analysis. Stress analysis forcritical force components in torque transmission process was done. During theanalysis, this paper has analyzed the structure and performance parameters of the partsin limited slip differential. There will be some guidance on the performanceoptimization for limited slip differential. In addition, analyze the impact of the limitedslip differential on vehicle performance, including: vehicle drive performance,cornering, high-speed stability. Finally, some performance evaluation rules for thelimited slip differential are presented in this paper.3. First, make force analysis for vehicle with limited slip differential when they areturning around. Establish vehicle controllability and stability model including limitedslip differential. Then, use the Matlab/Simulink software for simulation analysis onthe model. By comparing the simulation results of car with ordinary differential andlimited slip differential, vehicle controllability and stability can be stated.4. Test the performance of limited slip differential. The RIICH G52011wasselected as a test vehicle for these tests. Kinds of roads are selected for testing theperformance of a limited slip differential, including: bench test, snow and ice road test,muddy road test. To further illustrate the performance of limited slip differential, testsunder the same condition are executed for vehicle with ordinary differential ascontrast. It is obviously that when the vehicle with limited slip differential travelingon the roads above, the left and right driving wheel’s speed are different. And highspeed side of the axle’s torque is lower than the side speed is low. This is consistentwith the limited slip differential torque distribution characteristics. The passing abilityperformance of the car has not been significantly affected. And when the vehicle withordinary differential driving on the roads above, the car’s left and right drivingwheel’s speed are different, however, the left and right axle’s torque are basically thesame and with small numerical value. It can be proved that the ordinary differentialhas a torque average distribution characteristic. For this reason, the passing throughability of vehicle with this kind of differential get worse obviously. In the paper and tests, the help that the limited slip differential has to improvevehicle power and passing through ability is proved. At the same time, the influence ithas on vehicle controllability and stability is also stated. In addition, there is alsocertain significance for the structure and performance optimization of the limited slipdifferential.