Finite Element Analysis And Optimization Of Spiral Bevel Gear In Tractor’s Central Transmission

The Spiral Bevel Gear, because of its Advantages-large load capacity, Hightransmission efficiency, Stable transmission, Low noise. are widely utilized in Aviation,navigation, automobile, tractors, machinery industry. In the gearbox of tractor, the Spiralbevel gear not only works as Transmission torque but also changes the direction of themotion.it is the important power transmission parts. The parts are very high in strength,dynamic performance and reliability requirements. However, its working condition in thetransmission system is very complicated. There may be external excitation induced by theoriginal motivation and load, but also mesh out of shock, backlash and tooth shape errorcaused by internal motivation. Along with the progress of modern science and technology,Spiral bevel gear develops with high speed, heavy load and light quality. So it is verynecessary to research spiral bevel gear strength, dynamic characteristic and reliability.（1）According to spiral bevel gear meshing principle and Tooth surface differentialneighborhood characteristics.Specific analysis of spiral bevel gear real tooth surfacemeshing.Combined with arc tooth bevel gear principle and Cutter equations. Derivation ofspiral bevel gear tooth surface equation.（2）Take advantage of Pro/E parametric design program, Establish the spiral bevelgear3D solid model And virtual assembly, In order to satisfy the contact finite elementanalysis, kinematic simulation and dynamic analysis.(3) Study finite element method and the basic principles of the analysis process. In viewof the main research solving methods of finite element contact problem analyzed andcompared.Ultimately determine the spiral bevel gear contact model and Contact algorithm.for nonlinear analysis In ANSYS, Ultimately get von mises stress and von mises total strainof the meshing gear and their Distribution situation. Apply Hertz contact theory Calculationskidding–80tractor front axle and rear axle spiral bevel gear theoretical value. The finite element analysis and theoretical values are compared and analyzed. Verify the finite elementreliability.(4) Analysis the spiral bevel gear of high speed rotating mode analysis, Self vibrationfrequency of the Spiral bevel gear is much larger than the rotation frequency and the meshingfrequency at high speed rotate. Under normal circumstances, they may not produce Selfresonance as a result of gear meshing. For gear design and further research provide a reliabletheoretical basis, through the mode of vibration Can be visually identified the weak link ofthe gear vibration. For gear design and maintenance provide reliable basis.(5) Fully considering the minimum volume, Bending strength design of the maximumallowable transmission power and Contact strength design of maximum allowabletransmission power, Establish a general objective function. Make use of the complex method;give spiral bevel gear transmission for multi objective optimization. To make the design morepractical, more rational, more scientific, for determining the spiral bevel gear of the mainparameters provide a new method.