In order to solve the problem of abnormal noise when the car is shifted

the dynamic model of transmission system with 7 degrees of freedom is established. The model contains flywheel

clutch

gearbox

transmission shaft

drive shaft and tire. Using the established mathematical model

natural frequency and main vibration shape of the transmission system can be obtained. With the help of Adams software to build a multi-body dynamics model of the transmission system

and then perform modal analysis calculations on the model

the main kinetic energy that affects the shift shock is concentrated in the flywheel

and the main potential energy is concentrated in the drive half shaft. Starting from the excitation

constructing the clutch vibrationdamping characteristic model

and analyzing the sensitivity of the clutch clearance angle

it can be concluded that the larger the clearance angle

the more obvious the shift shock. Therefore

the optimized design is carried out for the flywheel inertia

drive axle stiffness

and clutch clearance angle

and is installed on the real vehicle for verification. The results show that the shift shock of the vehicle is effectively improved by installing the optimized components. The established model and analysis method have guiding significance for improving the shift shock.