| The lubrication system,the important component of the vehicle transmission,carries a vital role in the power and reliability of the entire transmission,and the function of which is to provide suitable lubricating oil for important parts such as planetary gear mechanisms,clutches and transmission shafts,thus guaranteeing a good performance and long service life of each part.The rotating gap oil passage,the main lubrication form of the vehicle transmission lubrication system,suffers from the risk of insufficient lubricating oil supply caused by the external force of the lubricating oil when the transmission system rotates at a high speed,which will result in serious consequences such as mechanical failures due to lubrication failure.To realize the precise oil supply of various parts in the transmission device,it is necessary to grasp the flow of lubricating oil in the rotation gap oil passage of the transmission device lubrication system and the influence of various influencing parameters on the flow characteristics of the rotation gap oil passage.According to the requirement of precise oil supply for the lubrication system of vehicle transmission,a theoretical model of the flow rate of the rotating slot oil passage is proposed,and the lubrication mechanism and flow characteristics of the rotating slot oil passage are discussed.The flow characteristics of the lubricating oil in the rotating slot passage and the influence of the parameters on the flow field are studied,and the influence of parameters such as oil temperature,inlet pressure and rotating speed of the rotating oil passage on the lubricating flow field is analyzed based on computational fluid dynamics(CFD)method.The correctness of the theoretical model and the simulation calculation is verified by the test analysis of the transmission device rotating slot lubricating oil passage test bench,and the software of "lubricating flow prediction of rotating oil passage" is designed and developed based on it,which provides technical support for the design and development of rotating oil passage and performance prediction of lubrication system.(1)Firstly,the fluid domain model of the lubrication system’s rotating gap oil passage is established,and the lubrication flow field is divided into two parts according to the structural characteristics of the fluid domain model,namely the distribution passage flow field and the main oil passage flow field.According to the structural characteristics of the fluid domain model,the mathematical model of lubricating oil flow in the flow field of the main oil passage is established,and the numerical value of the lubricating oil output at different outlets of the rotating slit oil passage is calculated with the flow of the rotating slit oil passage analyzed.(2)To verify the feasibility of the mathematical model of the rotating gap oil passage flow field,and to further explore the influence of different parameters on the flow characteristics of the rotating gap oil passage,the method of computational fluid dynamics was utilized to establish the rotating gap oil passage.Subsequently,the flow state of the fluid in the flow field in the rotating gap oil passage is analyzed and the influence of factors such as oil temperature,inlet pressure and speed on the oil output of different oil outlets is explored through numerical simulation.(3)The rotating slot oil passage test piece of the lubrication system is designed independently,and experimental research and result verification are carried out through the transmission system lubricating oil passage test bench.Moreover,the oil output performance tests of different outlet positions of the rotating slot oil passage under different working conditions are carried out,and the flow field characteristics of the lubrication system under different profiles are analyzed.Besides,the accuracy of the flow field flow mathematical model and the simulation calculation model of the rotating gap oil passage are verified by comparing the experimental data.(4)The inlet layout of the rotating slit oil passage is redesigned,while the mathematical model and simulation calculation model of the axial inlet rotating slit oil passage flow rate are established to explore the significance of the rotating shaft speed on the flow characteristics of the rotating slit oil passage based on the above research methods.Furthermore,two kinds of lubrication flow prediction software of rotating slot oil passage with different inlet layout are designed and developed,which provides basis and reference for the design and development of vehicle transmission lubrication rotating oil passage based on MATLAB/GUI software. |
