Articulated Steering Tractor Steering Hydraulic Cylinder Arrangement Position Optimization

Articulated steering tractor is a new type of agriculture transportation equipment in Guangxi area according to the actual situation of the local derivative. It played a prominent role in solving the mountain transport and cargo transshipment. The hydraulic cylinder is an important part of vehicle steering system, the arrangement position of the hydraulic cylinder is not only related the safety of the vehicle, but also related the overall performance of the hydraulic cylinder and the vehicle body motion state, at the same time, it also affects the stress condition of the connecting pin. But in the product design process, because of the production department’s capacity constraints, they don’t have an in-depth study on the hydraulic cylinder arrangement.This dissertation use articulated steering tractor as the research object, choice and check the hydraulic cylinder parameters, focus on the analysis of single hydraulic cylinder arrangement position in the steering geometry relationship. with the principle of steering hydraulic cylinder to provide minimum steering force, make the hydraulic cylinder arrangement parameters as design variables to establish the objective function with nonlinear multi constraint conditions, and use the interior point penalty function method to solve the optimal layout of the best point position parameters of hydraulic cylinder. The results show that, with the same steering resistance torque, the steering force decreased by 30.43%.In order to check the effect before and after optimization schemes on steering stability and the pin shaft force, we use UG software to establish the vehicle entity optimization model, use ADAMS software to establish the vehicle movement simulation model. In the process of simulation, firstly analyze the effect before and after optimization scheme for front vehicle steering angular velocity which is directly affected the stability of steering. The simulation results show that the optimization scheme has an obvious improvement when turning right. Secondly, the force condition of the pin is analyzed when the vehicle turn left and right with the speed of 20km/h. According to the simulation, we can know the pin force condition of the optimization scheme is obviously better than the original scheme, in the two kinds of circumstance, pin squeeze and shear condition are analyzed by finite element analysis. The stress of the pin which is optimized is decreased by 31.34%, and the stress changes of the pin also is satisfied the requirement of the yield strength of the material, the pin shaft can be used safely.