Abstract:In order to explore the influence of multi factor interaction on the reliability of oil seal,the oil seal between input shaft and bearing end cap in a reducer was taken as the research object.Based on the finite element software,the static pressure distribution curve and influence coefficient matrix of the oil seal with different structural parameters were obtained.The analysis results were integrated into the mixed numerical calculation model of the oil seal,and the effects of seven structural parameters on the pumping rate and friction torque of the oil seal were analyzed and calculated,including the oil side lip angle,the air side lip angle,the theoretical contact width,the interference amount,the spring stiffness coefficient,the waist thickness and the waist length.Taking the seven structural parameters of the oil seal as variable factors,the orthogonal test was designed with the pumping rate and friction torque of the oil seal as the response objectives to study the sensitivity of each structural parameter to the reliability of the oil seal.The results show that the influence degree of each factor on the sensitivity of oil seal pumping rate is in the order of oil side lip angle,theoretical contact width,air side lip angle,waist thickness,interference quantity,waist length,spring stiffness coefficient.The influence degree of each factor on the sensitivity of oil seal friction torque is in the order of oil side lip angle,theoretical contact width,waist thickness,spring stiffness coefficient,interference,air side lip angle,waist length.It shows that the oil side lip angle and theoretical contact width are the main factors affecting the reliability of oil seal.The optimal combination of oil seal parameters was determined.The friction torque of the oil seal after optimization is lower than that before optimization,so it can reduce the friction heat generated during oil seal operation,so as to prolong the service life of oil seal.When the oil seal works,the heat generated by friction can be reduced,so as to prolong the service life of the oil seal.