Research On The Design Of Composite Roller Movable Teeth And Its Influence On The Dynamic Characteristics Of Transmission System

As the second reduction mechanism of large-scale transportation equipment such as loaders and dump trucks,wheel reducers are often designed for large load,light weight,low noise and long life.Roller movable teeth transmission has the advantages of compact structure,high bearing capacity and high transmission efficiency,which is highly suitable for wheel reducer.However,under the heavy load and impact load,the roller movable teeth is easy to produce defects such as large contact stress,edge stress concentration and vibration noise,which affect the dynamic performance and service life of the equipment.Therefore,it is necessary to design the structure of roller movable teeth and study the dynamic characteristics of the system.Taking the roller movable teeth as the research object,a composite roller movable teeth structure was proposed.Based on the comparison and analysis of the structural differences between the composite roller movable teeth and the hollow roller movable teeth,and considering the influence of the logarithmic modification,two correction coefficients,?_c and?_e,were introduced to obtain the calculation formula of the meshing deformation of the composite roller movable teeth.In the effective meshing force range,the meshing deformation was verified by the finite element method.And the distribution law of the equivalent stress at the meshing line of the roller movable teeth was analyzed.The results show that the composite roller movable teeth can effectively improve the edge stress concentration and reduce the maximum equivalent stress significantly.The dynamic model of the composite roller movable teeth system was established through the lumped-parameter method.According to the Lagrange equation,the dynamic equation of the movable teeth system was established.The damping ratio of system was calculated by the method of half power bandwidth and modal strain energy,and the vibration response curve of the composite roller movable teeth system was solved through Duhamel integral formula.Because the damping component between the guide frame and the composite roller movable teeth is the largest in the torsional direction,the torsional vibration response of the guide frame is the fastest to reach stability.In SolidWorks software,three-dimensional models of composite roller movable teeth with filling degree of 0%(solid roller movable teeth),30%and 40%were established,and the quality of roller movable teeth were evaluated.The vibration response curves of the transmission system with different filling degrees were obtained by MATLAB software.The amplitude frequency characteristics of the torsional acceleration response of the wave generator and the guide frame were analyzed.The results show that with the increases of the filling degree,the damping ratio increases,and the time for the vibration response of the wave generator and the guide frame to reach steady state is shortened.By using the dynamic simulation software ADAMS,the transient meshing force simulation,transient input torque simulation and variable load simulation of the composite roller movable teeth transmission system with different filling degrees were carried out respectively,and the dynamic characteristics of composite roller movable teeth transmission system were further revealed.The results show that the composite roller movable teeth drive is more suitable for the impact load.