| Excessive temperature rise during travel of road wheel with rubber on high-speed tracked vehicles can affect rubber life.With the application of the large-stroke suspension and the small-size road wheels,the frequency of the cyclic load applied by the same speed is increased,the heat generation of the flange material is more serious,and at the same time,due to the increase of the stress level,mechanical damage is more likely to occur.In response to these problems,this paper proposed the idea of applying polyurethane materials with excellent mechanical properties and good heat-dissipating rubber to the flange of road wheels.First,the thickness of the rubber material was determined based on the allowable strength and temperature of the rubber material.With the objective of evaluating the heat generation performance and heat resistance,the parameters of different types of rubber and polyurethane materials were compared and material selection was performed.Secondly,different polyurethane-rubber combined flange schemes were designed,and a finite element analysis was performed on the new schemes and the traditional rubber road wheels.The stress situation near the adhesive surface and the static stiffness of the road wheel were compared,and the static stiffness of each road wheel was estimated.The fatigue life of the rubber and the combined flange road wheels scheme was estimated by the fracture mechanics theory.Through the multi-body dynamics simulation of the tracked vehicle and the simulation of the two-degree-of-freedom linear vibration model,the dynamic load of the road wheel was obtained.The correctness of the data was verified by comparing the results of the two models.Using the obtained vibration load and tangential load,and taking into account the influence of the vehicle speed on the heat transfer coefficient,the temperature field of the road wheels was analyzed.The simulation and analysis results of steady temperature field of different polyurethane-rubber combined flange schemes were compared,and the best combination scheme was obtained by taking the maximum temperature rise of the loading wheel as an index.According to the optimized combination scheme,a variety of heat dissipating holes were designed.The heat dissipation structure which can further reduce the maximum temperature rise of the polyurethane and rubber materials was obtained,and the influence of the number and size of the heat dissipation hole on the maximum temperature was explored. |
