Research On The Omni Directional Steering Design And Chassis Optimization Based On In-wheel Motor Vehicle

With the increase of car ownership,urban traffic jams and the shortage of parking spaces in cities are becoming more and more serious.For the majority of drivers,finding parking locations and driving in crowded and in small spaces are challenging,even if you have find a parking space or have enough space for driving,its still a great problem to controlling vehicles entering a parking space in safe,and driving in complex road conditions.Due to the limitations of the conventional automobile steering system and the chassis,the steering operability of the vehicle is greatly limited,and a large safety space is required during driving and parking to ensure the safety of the vehicle.The driver can achieve lateral movement/zero-radius steering and the wheelbase/tread change by controlling different mechanical structure.The operability of the vehicle is greatly improved.In crowded road sections,complex road conditions,and difficult parking conditions.The driver will have a better driving experience.In this paper,the vehicle's omni-directional steering design and chassis optimization research based on in-wheel motor are developed in terms of improving the steering operability and chassis flexibility of the vehicle.The main work of this paper is as follows:First,the author proposes a new type of omini-directional steering mechanism that improves the directional maneuverability of the vehicle.After summarizing the advantages and disadvantages of the vehicle steering mechanism at the present stage and the methods adopted at present to improve steering maneuverability at domestic and abroad,a new type of steering mechanism was designed based on this,and a zero-radius steering and lateral parking was determined.The program.SolidWorks was used to model and improve the design of the mechanism,and the omni-directional kinematics model of the vehicle was established based on the Akerman steering principle.Secondly,the author proposes a new variable wheelbase and variable tread mechanism scheme to improve the flexibility of the vehicle chassis.The author summarizes the mechanical transmission mechanism of the traditional vehicle chassis and relevant researches of improving the flexibility of the vehicle chassis at the current stage.Based on this,a new type of variable wheelbase and tread mechanism is designed.Which can change wheelbase or tread at one time.Using SolidWorks to model and optimize the mechanical design.Finally,simulation experiments were conducted on the operability of the omni-directional steering system and the chassis frame.In this paper,the simulation experiments are carried out using three typical working conditions of vehicles,including angle step input,steering return,and single shift,and the operability of the omni-directional steering system is evaluated by simulation results..Through the simulation results,the operability of the omni-directional steering system designed in this paper is evaluated.Furthermore,the finite element analysis of the chassis frame is carried out using ANSYS,and the stiffness and strength of the chassis frame are simulated and checked by two typical driving conditions: full load bending conditions and full load torsional conditions.Through simulation experiments,the results show that the omni-directional steering system designed in this paper has good operational stability and can achieve normal steering operation.The wheelbase and track variable mechanism designed in this paper should be carried out in the corresponding part of its strength and stiffness.The parameters are optimized to meet the driving requirements.