Clearance Sensitive Characteristics Analysis And Suppression Of Automatic Transmission Electro-hydraulic Control Module

With the development of design capability and manufacturing technology,automatic transmission has been more and more widely used.In order to reduce the production cost,the electro-hydraulic control module of the core components of automatic transmission is gradually used to obtain the body blank by aluminum alloy pressure casting,and then reaming the valve hole on the valve body.Because aluminum alloy material directly acts as the mating surface,the mating clearance of the valve core body is easily affected by the environmental factors such as bolt preload,temperature and pressure,to reduce the control quality of transmission and even cause control failure.How to reduce the influence of the above factors on the clearance of the spool valve body and improve the stability of the electro-hydraulic control module has become an urgent problem to be solved.Aiming at this problem,this paper takes the electro-hydraulic control module of a type of automatic transmission in a cooperative enterprise as the research object,and carries out the performance change of the electro-hydraulic control module under the condition of multi-factor change by means of finite element analysis and numerical calculation.The work of regularization and related research are expected to provide a reference for the design of the hydraulic control module.Specific research contents are as follows:(1)Introduced the development status of electro-hydraulic control module and environmental adaptability at home and abroad.Then according to the physical model of the cooperative enterprise,the three-dimensional model of the electro-hydraulic control module of automatic transmission was established by UG software.According to the principle of finite element analysis and the shape and structure of the working chamber,the method of studying the valve hole and spool is determined.(2)Based on the finite element analysis software ABAQUS and the model design software UG,the simulation analysis of the hydraulic control module is carried out under the condition of multi-factor changes.Based on the discrete data obtained from simulation and the theory of evaluating roundness,the more accurate radial deformation of valve holes and spools is counted and extracted.(3)The influence of each factor on the working cavity clearance of the electro-hydraulic module of automatic transmission is analyzed by orthogonal test.Relevant parameters of the electro-hydraulic module are improved.The results show that the working cavity clearance of the improved electro-hydraulic module of automatic transmission is reduced by 1.247μm,that is,the deformation is reduced by9.41%,compared with that before the improvement.(4)The environmental adaptability test bench of the electro-hydraulic module of automatic transmission is built,and the performance comparison test of the electro-hydraulic control module before and after the improvement is completed.The experimental results show that the performance of the improved electro-hydraulic control module has been greatly improved.