Thermal-structural Coupling Simulation Study On Heterogeneous Friction Plate Of Wet Clutch

Wet clutch is an important component directly linking the engine in vehicle drive system. When the wet clutch is transmitting dynamic torque, serious results like sintering of friction pair and failure of the wet clutch are due to instantaneous high temperature over the limit temperature of friction material. The thermal-structural coupling simulation study on heterogeneous friction plate of wet clutch is of great guiding significance in increase of the clutch life and safe operation of vehicle.A heterogeneous friction plate thermal physical model of the clutch uniting process is established based on the differential equation of heat conduction and thermo-elastic dynamics equations. The boundary conditions are determined on the grounds of the law of friction heat distribution, empirical formula of heat transfer coefficient and structural constraint. Temperature field and stress field of the friction plate with grooves are simulated by the ANSYS using thermal-structural coupling method. The distribution of temperature and stress at friction plate main area are analyzed in detail. And how pressure, friction coefficient, thermal conductivity and coefficient of thermal expansion affect the distribution of friction plate temperature and stress is studied in this thesis. The results can offer theoretical basis to optimization design and operation of different materials clutch.Main conclusions are as follows:(1) The distribution regularity of heterogeneous friction plate temperature and stress when wet clutch is uniting are as listed below:①The highest temperature, biggest stress and biggest displacement are first increase then decrease with the increase of uniting time, and the maximum values of the highest temperature148.1℃, the highest stress146MPa, the biggest displacement0.0427mm respectively appear at0.1s,0.1Is,0.19s.②Ellipse hot spot forms on every small friction surface, and along the radius direction, the larger the radius is, the higher the temperature is. The temperature distribution along11.25°is a convex parabolic profile on small friction surface and a concave parabolic profile on small groove surface at0.1s. The temperature along outside surface11.25°reduces with decrease of z..③The highest stress of the friction plate appears in the groove, and along outside surface11.25°the stress on the friction plate and basic plate surface respectively first decreases then increases with decrease of z. The biggest displacement on the friction surface increases with increase of radius.(2) The rules how single parameter influence the temperature and stress field of friction plate are listed as below:①The bigger pressure or friction coefficient results in the highest temperature, biggest stress and biggest displacement increasing.②The bigger thermal conductivity of friction plate results in the highest temperature, the biggest stress declining and the biggest displacement increasing.③When the coefficient of thermal expansion increases,the biggest stress and biggest displacement increase.52pictures,21graphs,58references.