Design And Experimental Study On The Dimensions Of Multiphase Six Link Steering System

With the increasing improvement of social production efficiency,the use of multi axle heavy-duty vehicles is becoming increasingly widesprend.In order to achieve the optimal steering of the multi-axle heavy-duty vehicle steering system and ensure that all steering wheels arc in a pure rolling state during steering,it is necessary to meet the condition that the steering centers of all steering axle wheels coincide at one point,that is,to meet the Ackerman steering principle.This article takes multi axle steering heavy-duty vehicles as the research and application background,and conducts research on their multiphase six link steering system.The Watt-Ⅱ central arm six link steering mechanism is used as the phase mechanism for theoretical research,simulation analysis,and experimental research.In this steering system,each phase mechanism is a six link mechanism and is connected to two wheels of a steering shaft.Due to the different dimensions of each phase mechanism,it is composed of multiple six link mechanisms of different sizes that are coupled and connected through a coupling mechanism,so it is called a multiphase six link steering system.Firstly,research was conducted on the various phase mechanisms of the multiphase Watt-Ⅱ central arm six link steering system,with a focus on the three-phase and four-phase steering systems.A mathematical model of Watt-II type central arm six link steering mechanism and phase coupling mechanism was established,and the input steering angle interval was refined.Firstly,based on the given calculation[0°,45°]steering angle range,multiple sets of data were calculated,and the rod length data was analyzed to reasonably divide the data.A multi-phase six link steering system opitimzation model has been established,and the model has been simplified according to the actual situation for the selection of reasuonable initial values and optimization design analysis of subsequent phase mechanism.Secondly,based on the calculatioon data within the given calculation steering angle range,a simulation model was established in the simulation software,and reasonable initial data of the three-phase steering system(including the coupling mechanism)was selected based on the simulation results.Then,the optimization design was carried out using the optimization module of the simulation software,and the rod length data of the three-phase steering system with good final results were optimized,that is,a set of data with small steering angle error,to achieve the goal of reducing the steering center error.The results show that the steering accuracy of the three-phase steering system has been improved after optimization.A simple chassis structure was designed using 3D software,and experiments were conducted using optimized data.A test bench was built based on the required testing content.The simulation and experimental results were compared,and the results showed that there was a small difference between the simulation results and the experimental results.This further verified the rationality of the rod length data of the three-phase steering system designed in this paper and the feasibility of the design method.Finally,by increasing the given calculation steering angle range to 60°,the rod length data of the four phase six link steering system mechanism was calculated.The rod length was selected and optimized using the same steps as the design process of the three-phase six link steering system,and the optimized rod length data was obtained for simulation analysis.A four phase six link steering system test was designed,and the test results were compared with the simulation results.The results indicate that the overall steering angle error of the designed four phase steering system is small,and the steering angle error is also small near larger angles(60°).The simulation results and experimental results have a small difference,further verifying the feasibility of the design method.This article obtained a design method for the size of a multiphase six link steering system through research,and conducted simulation analysis and experimental research.The research results showed that the design method is feasible and can effectively reduce the center error of the system’s steering,while increasing the maximum steering angle range.When the steering angle is near a large angle,the steering angle error is also small,which can provide a theoretical basis for further product design.