Abstract
This chapter describes automotive friction brake types, and methods of analysis for, disc and drum brakes to predict the relationship between the actuation force and the brake torque generated. The brakes studied, with examples, include leading/trailing shoe (simplex), twin leading shoe (duplex), duo-servo and S-cam drum brakes, and fixed (opposed piston) and sliding caliper designs of disc brake. Basic calculation methods for disc brakes are presented where the friction force between the pad and the rotor is modelled as a single resultant force, and then the effects of contact force and pressure distribution at the friction interface are examined, including bulk deformation arising from component flexure, localised deformation and distortion of the rubbing surfaces, and asperity contact and interaction. Classical methods of drum brake analysis are described, and a basic method for calculating drum brake torque is shown. The role of computer analysis methods especially the finite element method is explained. Design parameters including brake factor, specific torque, and ηC*, and their sensitivity to changes in the coefficient of friction, are explained and discussed.
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