The Analysis And Optimization Design Of Shuttle Car Steering Four_Bar Linkage

Trackless shuttle car underground coal vehicle is one of the most important transport vehicles. Trackless shuttle driven by motor, deviced by a scraper, is a auxiliary rubber tire vehicle for short-range and quick carrying coals.Because the underground work environment is special and the shuttle car in the underground needs to steer in the roadway,the analysis of steering characteristic is necessary. As a part of the steering system, steering four-bar linkage plays a vital part in vehicle steering. In terms of the influence of steering system produced by four-bar linkage, this paper analyze the steering arm length and trapezoid bottom corner two parameters institutions and finally concludeded the tire steering resistance torque and the force varition of steering tie rod four-bar linkage hinge point.In this paper, the analyzing object is TY9FB trackless shuttle car.The main study and analysis are as follows:First, the parametric models of steering four-bar linkage has been established in admas software, optimized and calculated.This paper has analysized the working principle of four bar linkage, made the error minimum of the outside wheel’s actual deflection angle and theoretical deflection angle as optimal objective function and the purpose of optimization is to reduce sliding sideways of tyre.This paper has finished optimization design and theoretic calculation on steering characteristics. Second,thtee-dimensional models and a virtual prototype model of the shuttle car have been created according to the size of two-dimensional maps of the various components. First, according to the original CAXA2D drawings,3D original model is created in UG, and then establish three-dimensional model based oparameter values after the optimization design.Import3D model into the admas software of kinematics to simplify,add tires, ground and constraints, and series of operations. ultimately establish a virtual prototype before and after optimization of the shuttle car.Third, motion simulation is carried out in a90°curve and5m wide roadway and compare the steering capabilities of the shuttle car before and after optimization by the simulation.A series of simulation curves and data can be got by simulation experiments, Some conclusions can be obtained by collations and analysis.and analyzed steering characteristics before and after optimization especially compared the force on the the tie rod before and after the optimization of four-bar linkage steering.the turning moment of resistance of the tires considerably dectreased after the optimization of the shuttle car, the force on the tie rod also decrease substantially. The optimization prolong the life of the steering four-bar linkage, eliminate the shuttle car’s slippage in the steering and improve the security and flexibility of the vehicle.Fourth, finite element analysis for the tie rod of the the steering four-bar linkage has been carried out.Collecting the parameter values from the motion simulation.according to these values,conduct the finite element analysis upon the tie rod. Then compare the stress and strain of the tie rodbefore and after optimization and check out the tie rod’s driving requirements that meet the vehicle steering.The research above provide a theoretical basis for the optimization design of vehicle steering four-bar linkage.and the effect of four-bar linkage steering characteristics and can also provide some ideas for the research of vehicles, four-bar linkage.