With the rapid development of China's transportation, research on automobile and vehicle technology has also accelerated.Cars are required to run under more severe working conditions, which puts forward higher requirements on the performance of the vehicles.One of the focuses of automobile transmission system research is the automobile bogie. Among them, the KTR coupling is an important part of the transmission system. During the work process, the KTR coupling is required to complete large torque transmission and high-speed operation. The connection space is limited, so it is a technical difficulty in actual design.

　　According to the data of the automobile transmission system provided by the automobile factory, understand the overall working principle of the automobile transmission system.Reverse the data of the KTR coupling with straight-tooth end gear currently used in the car provided, derive the parameter calculation formula, and calculate and check the contact fatigue strength and bending fatigue strength of the straight-tooth end gear disc.

　　First, use Pro/E software to complete the modeling of the three-dimensional solid of the straight tooth end gear plate, and perform virtual assembly and interference inspection.In order to facilitate the calculation, the pre-processing of the finite element model is completed in the Hypermesh software, including the division and inspection of the finite element mesh, the setting of element attributes and real constants, the creation and loading of contact pairs, and the setting of the solver.

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