Optimization Design Study On The Structure Parameters Of Oil Seal Based On Response Surface Method

Oil seal has become one of the most common dynamic shaft due to its advantages of good sealing,long service life,and low cost.The sealing performance of oil seal is affected by many factors,such as its structural shape,the rubber material,the lubrication state and the working condition parameters.The traditional oil seal structure design to a large extent depends on the designer’s experience and skills,However,in recent years,with the wide use of finite element software,the simulation of seal performance of oil seal under the complex working conditions has become possible,which provides a fast and efficient analysis method for the optimization design of oil seal.The two-dimensional axisymmetric model of oil seal was established by using finite element analysis software ABAQUS,and the effect of the structural parameters such as contact width,low-angle and high-angle,interference and waist depth on the sealing performance of oil seal was analyzed.The results show that the maximum contact pressure of the lip is reduced with the increasing of the contact width,the low-angle and the interference,but increased with raising of the high-angle and the waist thickness.With the maximum contact pressure of sealing surface as the optimization target,the structural parameters of the oil seal were optimized based on the response surface methodology,and the optimal structural parameters combination scheme was obtained.The three-dimensional finite element model of oil seal was built.The unsteady temperature field of oil seal before and after optimization was simulated and the relationship curves between pressure,speed and oil temperature were obtained.The simulation results show that the temperature of the seal ring is decreased with the increasing of the pressure,and increased with the increasing of the rotational speed.The temperature on the friction surface is increased gradually from the two sides to the middle,and the maximum temperature appears at the center close to the air side.The change of temperature of the optimized oil seal tends to be smooth with the increasing of the rotational speed and the pressure,which proves that the optimized oil seal has better sealing performance and heat dissipation performance.Based on the results of finite element analysis,integrating the theoretical methods of numerical calculation,the influence of parameters such as contact width,low-angle and high-angle,axial force and rotational speed on pumping rate were analyzed,the influence of the rotational speed on the friction torque was also analyzed.The results show that the pumping rates of the two oil seals increase with the increase of low-angle and rotation speed,decrease with the increase of high-angle and axial force.The optimized oil seal has better pumping effect than the pre-optimized oil seal,and with the increase of the rotational speed,the friction torque is obviously lower than that before optimization.