中文摘要：

为了更准确地研究具有凸轮张开装置的领、从蹄式制动器系统的力学行为,在凸轮轴上施加输入力矩来模拟仿真制动器系统的制动过程,并通过ADAMS动力学仿真软件进行仿真分析。计算结果表明：具有凸轮张开装置的领、从蹄式制动器系统在制动过程中,领蹄制动力矩远大于从蹄;由于非线性摩擦因数等的影响,领、从蹄在制动过程中一直处于随机振动状态,且领蹄振动程度随着车速的提高而明显增大;领蹄的制动摩擦衬片上的切向摩擦力（或衬片上的正压力）分布为中部大、两侧小,而从蹄摩擦衬片上的切向摩擦力分布为上部大、下部小,且从蹄切向摩擦力远小于领蹄切向摩擦力;从蹄促动力大于领蹄促动力,在凸轮输入力矩相等的情况下,领、从蹄促动力不随车速发生变化。

英文摘要：

In order to study the mechanical performance for the leading-trailing brake system with an opening device by a cam accurately,the braking process of brake system in which the author applied the input torque on the cam axis was simulated by ADAMS dynamic simulation software.The results show that the leading shoe brake torque is far greater than the trailing shoe in the brake process with an opening device by a cam;owing to the nonlinear friction factor and other reasons,the leading shoe and the trailing shoe have been in a state of random vibration and the leading shoe vibration intensity increases with the raising of the vehicle speed;the distribution regulation of the tangential friction（or normal force） on the brake lining of the leading shoe is that the middle part is greater than the both sides,however the tangential friction on the trailing shoe is far less than that on leading shoe,and its distribution law is that the upper part is large and the lower part is small.The opening force of the trailing shoe is greater than that of the leading shoe,and both opening forces remain unchanged with different vehicle speeds when input torques applied to cam are equal.