Abstract: Against the backdrop of the growing demand for lightweight development in new energy vehicles, a diverse array of composite material components has emerged. However, existing composite connecting rods face the dual challenges of "poor reliability at connection interfaces" and "difficulties in efficient batch manufacturing." In this paper, a novel composite connecting rod is designed based on the mortise-and-tenon-inspired mechanical self-locking principle, and an efficient preparation method is proposed. The method employs reaction injection pultrusion to prefabricate continuous

Key words: composite materials; connecting rod; self-locking connection; reaction injection pultrusion

摘要： 在新能源汽车轻量化发展的需求下，各式复合材料零部件层出不穷。然而，现有复合 材料连杆面临“连接界面可靠性差”与“高效批量制造难”的双重挑战。文章设计了基于榫 卯式机械自锁原理的复合材料连杆及其高效制备方法。该方法采用反应注射拉挤工艺预制连 续纤维增强件与带三角形倒扣的齿状卡扣件，通过二者的啮合自锁构建稳定骨架，并最终与 接头经整体注塑成型为统一构件。文章详细阐述了该连杆的结构设计原理、分步制备工艺流 程，研究了自锁连接抑制屈曲失稳的力学机理，分析了拉挤－注塑复合工艺在保证性能与提 升效率方面的协同优势，并从可设计性与技术经济性角度论证了该方案的先进性。研究表明， 该一体化设计不仅为连杆提供了轻量化设计思路，还为解决复合材料承载结构件的可靠连接 与低成本批量制造问题提供了可行的新路径。

关键词: 复合材料；连杆；自锁连接；反应注射拉挤