Abstract：To study the stability of united hydraulic retarder and friction brakes, based on the ″I-β″ curve method， a new kind of ″M-N-P″ curve method was proposed to realize qualitative analysis of united brake stability of articulated vehicle， and the lock up sequence of articulated vehicle axles under different road conditions was obtained. The quantitative analysis of brake stability under various working conditions was also conducted based on the concept of brake force utilization ηb . The results indicate that when the hydraulic retarder works, the increasing of brake torque on drive axle of tractor rear axle can make it lock up in advance, and the range of adhesion coefficient shows upward trend to cause the unreasonable condition with the increasing of hydraulic retarder gear. The brake force utilization first increases with later decreasing, and it is significantly lower on low adhesion coefficient road. The hydraulic retarder applied on articulated vehicle should not work at high gear for long time and be used with caution when road surface is wet or slippery.
2016, Vol. 37 
