关键词: 变速器；非对称型换挡拨叉；拓扑优化；鲁棒性

Abstract: The load distribution of the fork arms on both sides of the shift fork has a crucial impact on the shift performance and comfort of the gearbox. In this paper, according to the design requirements of the shift mechanism, the initial structure model of the shift mechanism is established and the finite element analysis is carried out. The finite element calculation results are used as the topology pre-input conditions. The topology optimization analysis of the initial structure of the shift fork is carried out by using the variable density isotropic material penalty model algorithm, and the optimal design structure of the shift fork is obtained. The part of the optimized design structure of the shift fork that does not meet the actual processing and manufacturing requirements is adjusted to obtain the final design structure of the shift fork. The numerical simulation analysis of the final design structure of the shift mechanism is carried out. Under the condition of limited design space of shifting mechanism, the load distribution of shifting fork arm is greatly optimized and the strength and durability life of shifting fork are improved. A design method for improving the robustness of asymmetric shifting fork of transmission is proposed.

Key words: Transmission; Asymmetric shift fork; Topology optimization; Robustness