Abstract: This paper decomposes the vehicle sliding resistance through the combination of road sliding test, drum test and bench test, separates the internal resistance of the transmission system from the sliding resistance, and further decomposes the internal resistance of subsystems such as caliper drag force, gearbox+transmission shaft resistance torque, drive axle+bearing resistance torque, which provides verification method and data support for internal resistance optimization. The results show that, the internal resistance accounts for about 20%～30% of the sliding resistance. The more complex the transmission system structure or the longer the transmission chain, the greater the proportion of internal resistance; The internal resistance of transmission system increases with the increase of vehicle speed; The internal resistance dispersion of individual parts is large. How to control the consistency of parts is also the key to improve the internal resistance.

Key words: Sliding resistance; Resistance decomposition; Caliper drag force

摘要： 文章通过道路滑行、转鼓试验和台架试验相结合的方法对整车滑行阻力进行分解，将 传动系统内阻从滑行阻力分离了出来，并进一步分解出了卡钳拖滞力、变速箱+传动轴阻力矩、 驱动桥+轴承阻力等子系统内阻，为内阻优化提供了验证方法和数据支持。研究结果表明，整 车内阻约占整车滑行阻力的 20%～30%，传动系统结构越复杂或传动链越长占比越大；传动 系统内阻随着车速增加而增加；零部件个体的内阻散差较大，如何控制好零部件的一致性也 是改善内阻的关键。

关键词: 滑行阻力；整车内阻分解；卡钳拖滞力