Mechanism and Optimal Design of High-Speed Stage Gear Whine of Electric Drive Transmission

Abstract:

To solve the gear whine problem of the high-speed electric drive transmission system， the vibration response analysis and structural optimization design method of high-speed stage gear system of electric drive transmission were discussed based on the traditional method of the gear modification and the dynamic meshing stiffness calculation of transmission system. First， the high-speed stage gear system was divided into the gear pair unit and the discrete shaft unit， and the bearing-housing unit was coupled. The modularized equations of motion for the corresponding units were built and the system dynamic model was established. Then， the mathematical model of dynamic meshing stiffness was deduced and vibration response was calculated under the exciting force which was the product of transmission error and dynamic meshing stiffness. Afterwards， based on an electric drive transmission system， a comparative analysis of vibration response simulation result and test result was conducted， and the validity of system dynamic model and the vibration response analysis through dynamic meshing stiffness were verified. Finally， with the change of different layout forms and component structure， the influence of different gear pair layouts and component structures on the dynamic meshing stiffness and transmission error were studied. The structural optimization scheme was made and test result of before and after optimization were compared. The results show that the optimized scheme vibration response of high-speed stage gear system drops significantly and the problem of gear whine is effectively improved. The research can provide new idea for the design of electric transmission gear systems.

Key words:electric drive transmission system;high-speed stage gear;dynamic model;dynamic meshing stiffness;transmission error;torsional vibration;structural optimization