Abstract
Special fork is an important load-bearing component in the transmission structure, requiring relatively high abrasion resistance and impact toughness. The fork usually works under the conditions of impact and abrasion and the effect of alternating load, therefore it is prone to fatigue damage. The reliability of the fork could exert direct influence on the stability and safety of the vehicles. By highlighting the fact that the shifting special fork in the transmission of some type of light vehicle is suddenly broken and become invalid during the vehicle driving process, this article had made static strength analysis and fatigue lifetime expectation research from the perspectives of Finite Element Method and accumulated damage. The findings of the analysis will provide reference for the improvement of components structure, finding of the root cause of the accidents as well as the selection of the general design mechanism.
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