Abstract: Based on the phenomenon that the temperature of coat and cap rack is too high in a vehicle during the vehicle exposure test, the influence of different assembly angles of the rear windshield, different materials of the rear windshield and different fabric materials of the coat and cap rack on the surface temperature of coat and cap rack is compared through the test data, and the related factors that lead to the excessive temperature of coat and cap rack in the test process are determined, and the corresponding solutions are proposed. It provides data reference for the improvement of vehicle design. The results show that during the test, the sun position shifted to the north and the sunlight directly hit the rear windshield, and the sun height angle at noon in low latitude areas is approxi-mately vertical, while the strong sunlight at noon had more severe effects on the rear windshield, coat and cap rack and other components tending to the horizontal angle. The poor light penetration performance of the rear windshield and the rapid heat accumulation and slow heat dissipation of the flannel fabric are the fundamental reasons for the excessively high temperature of the coat and cap rack. In serious cases, the coat and cap rack will have defects such as deformation, bulging, whitening, degumming and delamination, and the abnormal failure of the coat and cap rack may also be caused under the high temperature for a long time. The surface temperature of the coat and cap rack can be effectively reduced by improving the assembly angle of the rear windshield, selecting the rear windshield with high temperature resistance and sunscreen, and changing the fabric material of the coat and cap rack.

Key words: Exposure test; Coat and cap rack; High temperature; Solar altitude angle

摘要： 基于整车暴晒试验过程中某车型出现的衣帽架温度过高现象展开研究，通过试验数据 对比后挡风玻璃不同的装配角度、材质及衣帽架的不同材质对衣帽架表面温度产生的影响， 确定出在试验过程中导致衣帽架温度过高的相关因素，并提出相应的解决措施，为整车设计 改进提供数据参考。结果表明，试验过程中太阳位置北移，光照直射后挡风玻璃，且低纬度 地区中午太阳高度角近似垂直，强光照对趋于水平角度的后挡风玻璃、衣帽架等部件作用更 加严酷。后挡风玻璃耐光穿透性能差及绒布面料聚热性快、散热性慢等因素是造成衣帽架温 度过高的根本原因，严重时会导致衣帽架产生变形、鼓包、发白、脱胶、分层等缺陷，长时 间的高温状态下也可能导致衣帽架产生非正常失效现象。通过适当提高后挡风玻璃装配角度、 选用耐高温防晒型后挡风玻璃、改变衣帽架面料材质等措施都能够有效降低衣帽架表面温度。

关键词: 暴晒试验；衣帽架；温度过高；太阳高度角