Dynamic simulation of brake process on drum brake

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.