Research on Dynamic Performance of Drum Brake 2007-01-3673
The primary objective of this paper is to develop a model that accurately represents the dynamics of drum brake through the components of its configuration. Detailed description will be that dynamic models for brake chamber, brake camshaft and brake shoe are built up respectively with consideration of various resistances from friction, inertia and return spring. These dynamic models are indirectly validated because the calculation values of the models are consistent with the results from the mechanism efficiency experiments of drum brake. According to these dynamic models, two different drum brakes with Involutes and Archimedes cam actuating mechanism have been researched. Results indicate that drum brake with Archimedes cam actuating mechanism has bigger dynamic brake torque, because pressure angle of leading shoe's roller is larger than that of trailing shoe's roller, compressive stress on vertical direction is more lessened and rotational friction force of brake cam is cut down correspondingly.