As a core component of the vehicle transmission system, the wet clutch is widely used in cars, heavy vehicles and tracked vehicles, whose dynamic engagement characteristics affect directly the safety, comfort and durability of the vehicle. In this paper, the meshing process is simulated by finite element method. In the fluid friction, the average Reynolds equation proposed by Patir and Cheng is improved, and dimensionless parameters are adopted, which is applied to calculate the viscous torque. In the boundary friction, a surface elastic contact model is established to calculate rough contact torque. In the mixed friction, total torque consists of viscus torque and rough contact torque. The simulation and bench test are completed to verify the validity of model proposed. Model proposed can be used to guide wet clutch design in early stages of product development.
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