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

摘要： 针对某运动型多用途汽车（SUV）转弯直径偏大的问题，文章通过结合参数对标、结 构拆解、计算机辅助工程（CAE）仿真及台架试验开展优化。对比基础车型及同级别标杆车 型参数发现，目标车型在转向轮转角、车架尺寸上存在明显差距，进一步分析发现该差异由 三方面因素共同导致：一是为适配新发动机的布置要求，导致转向器下移，二是车架加宽限 制了横向稳定杆的合理布置，三是转向器自身行程无法满足设计需求。据此，文章提出 3 种 基于“转向系统-车架结构-悬架部件”的协同优化方案，对比验证显示，新开发横向稳定杆+ 调整车架第二横梁+增加转向器行程+下摆臂避让方案效果最佳，转弯直径优化 1 m，达到同 级别主流水平。同时，稳定杆刚度提升，转向器固有频率改善，轮胎间隙符合设计，工程可 行性高，对提升车辆操控性与市场竞争力具有实际意义。

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