Aiming at the performance characteristic of a special transfer case

a finite element model is built by using finite element method.Based on the static strength and modal analysis of the gearbox

the structure topology optimization is carried by using of the variable density method and taking minimum weighted strain energy as optimal object

displacement

volume fraction and stress as constraints. On this basis

the optimal design is carried out according to the topology density cloud

the weight of optimized gearbox is reduced by 8%.Analysis results show that

the overall performance of the optimized transfer case is improved

the lightweight design is realized.