关键词: 高地隙自走式喷雾机, 转向传动机构, 转向定位参数, 转向试验

Abstract: As an important part of high clearance selfpropelled sprayer, the steering system directly affects the handling stability, driving smoothness and spraying efficiency of the sprayer. A reasonable steering transmission mechanism can effectively reduce the side slip and tire wear during the steering process of the sprayer. According to the structural characteristics and operating environment of the high clearance selfpropelled sprayer, combined with the design requirements of the steering system, on the basis of the design and calculation of the steering positioning parameters, a steering transmission mechanism suitable for high clearance selfpropelled sprayer was designed, meanwhile, the threedimensional model was established, the parallel wheel jump test was conducted by ADAMS/Car, and the steering positioning parameters were optimized using ADAMS/Insight. The simulation results revealed that in the simulation test of the optimized steering system with a wheel jump amplitude of ±50 mm, the change range of the front wheel toein was reduced by 72%, the change range of the front wheel camber angle was reduced by 58.4%, and the change range of the vertical axis inclination angle was reduced by 16.9%, the change was significantly smaller and more gradual, which improved the handling stability of the whole vehicle and reduced the tire wear during the steering process. Based on the selfdeveloped 3WPG-3000 high clearance selfpropelled spray, a real vehicle test platform for the steering system was built, and the concentric steering trajectory of the spray under different steering modes was measured by the GPS equipment. The test results revealed that the steering radius was 6.85 m under twowheel steering mode and 5.12 m under fourwheel steering mode. At the same time, the designed steering system could complete the concentric circle rotation well in different modes, which could meet the steering requirements of the sprayer under different working conditions.

Key words: clearance selfpropelled sprayer, steering transmission mechanism, steering positioning parameters, steering test