To the question jf the estimation of heat transfer through the metal frictional elements of the disk and drum-pad drams of the vehicles

Abstract

The article discusses disc and drum-type brake devices of subcategories of vehicles, which, according to UNECE Regulation 13, are subject to the preliminary stages of Type I and II tests. For friction pairs of these brakes, heat transfer coefficients and distribution of heat fluxes, as well as their thermal resistance, are determined for multilayer thermal models.

Currently, there are simplified mathematical models that describe the boundary temperature conditions in individual parts of the disc-brake brake. In accordance with these models, it is assumed that the temperature field of a solid or self-ventilated brake disc has angular symmetry, and the proportion of heat removed by each brake component is taken into account using the heat flux distribution coefficient. It is possible to reduce the indicated coefficient for brake discs by intensifying the cooling of their surfaces by forced and forced air and other heat transfer media of indirect action. However, a more efficient way to reduce the energy load of the metal friction elements of the braking devices is the correct selection of materials for them that can take heat away in the shortest time, that is, they have a high heat transfer coefficient due to the low thermal resistance.