New chances for the drum brake through electronically controlled self-energizing

摘要

A new approach to cope with the disadvantages of the self-energizing drum brake by means of mechatronics is described. The introduced system allows for control of the brake factor of a duplex drum brake from C{sup}*=2 to C{sup}*=6. Variations of the friction factor μ due to fading will be compensated to a certain extent using an electronically controlled mechanism adjusting the support base of the leading shoes of the brake. The required application forces are up to seven times lower compared to a disk brake at equal braking torques. Theory, design and measurements of a prototype brake with mechatronically controlled self-energizing are the topics of this paper. The described research work was carried out at the Department of Automotive Engineering (fzd) of the University of Darmstadt.