Fluid-solid Coupling Analysis Of Rotary Seal In Vehicle Transmission And Performance Optimization

Rotary sealing ring,as a kind of dynamic seal in the vehicle transmission system,is an important component of the vehicle transmission system,which is widely used in hydraulically controlled rotary actuators such as wet clutches and torque converts.If the rotary sealing ring in vehicle transmission system fails,the vehicle will not run normally.During the work process of the rotary sealing ring,the oil in the sealing gap interacts with the stress state of the rotary sealing ring.This would cause distortion of the results if only considered the oil flow in the rotary sealing gap field or the structure of the rotary sealing ring.Thus,considered the fluid-solid interaction of the rotary sealing ring,the effects of working conditions on the seal behaviors were investigated,which provided the advices for the design and optimization of rotary seal system.Firstly,the numerical model for the flow field of the sealing gap and the finite element model for the sealing structural field were established based on the flow of oil,the stress state,and the deformation of the rotary sealing ring.Moreover,considered the relationship among the flow state,the stress state and the deformation of the rotary sealing ring,a fluid-solid coupling numerical model was proposed.Through numerical simulation,the flow characteristics and the leakage of the oil in the rotary sealing gap field,the deformation of the rotary sealing ring,the friction torque between the rotary sealing ring and rotary shaft were obtained.In addition,the influence mechanism of working condition parameters on the main performance parameters of the rotary sealing system was investigated as well.Based on the fluid-solid coupling numerical model and the numerical model for the flow field of the sealing gap,the influence of the deformation of the rotary sealing ring on the oil flow in the flow field was discussed.Secondly,the test ring for the sealing performances was built to obtain the test data of leakage and friction torque with different working conditions of the rotary sealing ring.Moreover,based on the test data,the curves of leakage and friction torque with different rotary shaft speed,oil pressure and oil temperature were obtained.By comparing the experimental results with the simulation results,the reliability of the fluid-solid coupling numerical model of rotary sealing was verified.Finally,based on the established fluid-solid coupling numerical model,orthogonal experiment was carried out with the structural parameters such as the installation size of shaft groove and the size of rotary sealing ring.Through the experiment,the influence of the main structural parameters on the main performance parameters of rotary sealing was studied.In addition,the optimal design scheme was proposed by taking leakage of rotary sealing system and friction torque as optimization objectives.And the comprehensive evaluation method was introduced to optimize the system by considering the leakage and friction torque synthetically,which improved the service performance of rotary sealing ring.