Prediction Method Of Adhesion Wear For Involute Spur Gear Considering Tooth Temperature Rise

Involute gear is the most widely used in transmission,and adhesion wear of tooth surface is the main form of transmission failure.The local high temperature caused by the friction of the tooth surface can easily lead to gluing,a kind of violent adhesive wear,resulting in failure of transmission,especially when the lubrication is poor.Taking the standard involute spur gear as the object,the numerical calculation method of adhesive wear considering the flash temperature of tooth surface is studied in this paper.The main research contents are as follows:(1)The flash temperature model of the tooth surface is established and analyzed.Based on the analysis of-the thermal deformation calculation method and the material thermal expansion coefficient,the equation for calculating the thermal deformation of involute tooth surface is derived.On the basis of the Blok flash temperature theory,the tooth surface flash temperature model is established,and the change law of the meshing stiffness caused by the flash temperature is studied,and the influence of the tooth shape parameters and working parameters on the tooth surface flash temperature is analyzed.(2)The spur gear dynamics model in consideration of the tooth flash temperature is built.The modeling method of gear dynamics and the type of excitation are analyzed.Based on the centralized mass method,the dynamic model of the gear drive system with tooth side gap,error excitation and time-varying meshing stiffness is established.On this basis,a dynamic model of gear system considering the flash temperature of tooth surface is derived and dimensionless treatment is carried out.(3)The gear dynamic equation considering the flash temperature of tooth surface is solved.On the basis of analyzing the common solving method of gear dynamics equation,the 4-5 order adaptive variable step length Runge-Kutta method is used to solve the nonlinear and strong coupling dynamics model of the gear system.At the same time taking into account the inconsistency of the period of the tooth surface flash temperature calculation model and the gear dynamics model,it is pointed out that special attention must be paid to solving the gear system and the dynamic meshing force should be solved.(4)The adhesive wear of involute gear considering the flash temperature of the tooth surface is calculated.Based on the Hertz contact theory,the average contact stress of the tooth surface is calculated,and the single point observation method is used to calculate the relative slip distance between the contact points.According to theArchard wear model,tooth surface wear without consideration of flash temperature under quasi-static loading and tooth surface wear under dynamic load with consideration of flash temperature were calculated.The effects of tooth profile parameters and working parameters on tooth surface wear were analyzed.The results show that increasing the modulus,pressure angle,transmission ratio,tooth width or reducing the input torque can reduce the amount of tooth wear.