在轮胎结构简化的基础上，建立了修正的轮胎刷子模型，并推导了轮胎纵向力的表达式．分析轮胎与地面之间的接触情况，建立动摩擦椭圆与静摩擦椭圆，分别求解附着区纵向力和滑移区纵向力，并对两者的关系进行分析．根据轮胎胎面与胎肩刚度的不同，求解胎面纵向力和胎肩纵向力，同时考虑刚度对接地印迹长度的影响．当滑移率在 0．0 ～ 0．2 之间时，修正的轮胎刷子模型、魔术公式与实验所得纵向力的结果基本一致．文中方法有助于轮胎的优化设计．

In the investigation,by simplifying the tire structure,a corrected tire brush model is constructed and a longitudinal force expression is set up.Then,by analyzing the interaction between tire and ground,the kinetic and static friction ellipses are established to solve the longitudinal forces from attachment and slip regions,and the rela- tionship between the two longitudinal forces is discussed.According to the stiffness difference of tire tread and shoulder,the longitudinal forces of the tread and the shoulder are solved under the influence of stiffness on contact patch length being considered.It is found that the corrected tire brush model accords well with the magic formula and the experimental results when the slip rate is between 0.0 ～0.2.Besides,the proposed method helps to opti- mize the design of tire.