关键词: SUV；转弯直径；转向系统优化；车架结构改进；参数对标；CAE 仿真

Abstract: To address the issue of excessive turning circle in a specific sport utility vehicle (SUV) model, this paper conducts optimization by integrating parameter benchmarking, structural disassembly, computer aided engineering (CAE) simulation, and bench testing. A comparison of parameters between the target vehicle, the base vehicle, and benchmark models of the same class reveals significant gaps in the target vehicle's steering wheel angle and frame dimensions. Further analysis indicates that these gaps stemmed from three factors: first, the steering gear is moved downward to accommodate the layout requirements of the new engine; second, the widened frame restricts the reasonable arrangement of the anti-roll bar; and third, the steering gear's own travel fails to meet the design requirements. Based on this, three collaborative optimization schemes centered on the "steering system-frame structure-suspension components" are proposed. Comparative verification shows that the scheme–featuring a newly developed anti-roll bar, adjustment of the second crossbeam of the frame, increased steering gear travel, and lower control arm avoidance–achieves the best effect: the turning circle is optimized 1 m, reaching the mainstream level of the same class. Meanwhile, the stiffness of the anti-roll bar is improved, the natural frequency of the steering gear is enhanced, the tire clearance meets the design requirements, resulting in high engineering feasibility. This study holds practical significance for improving vehicle handling performance and market competitiveness.

Key words: SUV; turning circle; steering system optimization; frame structure improvement; parameter benchmarking; CAE simulation