Transmission Error Analysis And Structural Efficiency Evaluation Of Spur Gear Reducer Based On LS-DYNA

Straight-tooth cylindrical gear reducers are widely used in various fields of the machinery industry,and the meshing performance of the gears directly affects the entire system.High speed and heavy load are the development direction of gear transmission.Ensure the accuracy and stability of the transmission has become an urgent problem to be solved.In this paper,a finite element analysis model is established to study the influence of different working conditions on the dynamic transmission error and contact performance of the spur gear reducer.These data can also be used to assess structural efficiency.The main content of this article has the following parts:(1)The contact stress formula of Hertz contact theory is deduced,the dynamic model of gear transmission is established to verify the transmission error expression,and the finite element contact algorithm is discussed.It lays a theoretical foundation for meshing contact analysis of gears.(2)The 3D model of spur gear reducer is built by SolidWorks.Based on HyperWorks,the finite element mesh model including shafting,elastic support parts,box and gear is built.The mesh of important contact parts is refined and boundary conditions are set.By checking the finite element model of dynamic transmission error under low speed and low load conditions,comparing the theoretical calculation with the experimental measurement data,modifying the boundary conditions,and improving the matching degree between the finite element calculation and the experimental measurement.The dynamic transmission error of the gear and the change rule of the contact stress of the tooth surface are studied.(3)Considering the variety of working conditions of the reducer,the finite element analysis models of coupling tooth profile error,pitch error and different gear materials are established.The effects of various factors on the dynamic transmission error,meshing stiffness and contact stress of gears are studied.(4)Using the basic theory of SPH algorithm and LS-DYNA software,the fluid-solid coupling numerical simulation of injection lubrication is performed.The effect of gas-liquid two-phase flow composed of lubricating oil and air sprayed from the oil injection lubrication system on the closed gear transmission was studied.(5)According to the structure and mechanical characteristics of the reducer system,combined with the structural functions and design requirements,the bearing capacity,anti-deformation ability,and mechanical environment adaptability of gear reducer systemsof different materials are evaluated and compared through parameters such as stress distribution coefficient and equivalent specific stiffness.Based on the evaluation parameters,the structural efficiency evaluation of the reducer system is completed.Evaluated the advancement and optimality of the structural design of the reducer system.