Reliability Analysis Of The Truck Rear Axle And Finite Element Analysis Of The Gear Under The EHL

Driving axle is the last part of the drive train，which include final drive, differentialmechanism, differential axle and Drive Axle Housing. In this paper, firstly the typicalfailure forms and reasons were introduced, secondly the fault tree of the driving axle isestablished. It was found that bevel gear failure, bearing damage and helical gear failure arethe three main influencing factors. Multigrid method is used to solve theelastohydrodynamic lubrication problems on heliacal gear. The gear teeth stress wasanalyzed by numerical simulation. Finally finite element analysis of bevel gears and fuzzyoptimization design of bevel gear are discussed.1) Through analyzing the structural design and load of gears, the elastohydrodynamiclubrication (EHL) problem is studied under actual working conditions of helical gear. Thenumerical solution is calculated and analyzed at the meshing points for the steady-state EHLproblem by utilizing the multigrid method. And the impacts of the oil film pressure andthickness on gear transmission are analyzed.2) The3-D model of heliacl gear is created by Slidworks software. Then the finiteelement model with considering the oil pressure between gear teeth as load is established byputting the model into the ANSYS software via the data interface. Considering the influenceof different loads at different meshing points from approach to recess, the finite elementanalysis is studied on the whole process of gear tooth. The results show that the teeth stressobtained from numerical simulation is good agreement with actual teeth stress values.3) At present the EHL of bevel gears research is not mature. But it was found that the oilfilm pressure of bevel gear is very close to that of involute spur gear by EHL numericalsimulation. In this paper.the bevel gear model is established in the Solidworks software. Thefinite element analysis of the bevel gear under elastohydrodynamic lubrication conditions wasconducted using the oil pressure as load. There are many uncertain design parameters in thebevel gear design because of the fuzziness and randomness of the design parameters. In thedesign process of bevel gear, the various random and fuzzy design parameters are often ignore in the traditional design method. The traditional design scheme is hardly consistent with thepractical results. Taking the bevel gear design for example, considering the fuzziness ofconstraint condition, the fuzzy optimization mathematical model is established and solved byusing Optimization Toolbox of MATLAB in the paper.