Interdependence of constructive and operation parameters of brake friction units

Abstract

Problem. Theoretical and experimental studies of the relationship between the braking torques developed by the friction assemblies of various types of brakes and their design and operational parameters made it possible to establish the following: the values of the braking torques developed by the friction assemblies of various types of braking devices and the influence of design parameters on them; changing the gradients of the braking moments for the most loaded friction pairs of the belt-pad brake of the drilling winch; values of local temperature gradients at the beginning and at the end of braking of vehicles and drilling winches to determine the thermal stresses in the metal friction element. Goal. The purpose of the work is to establish the relationship between the braking torques developed by the friction brake assemblies and their design and operational parameters. Methodology. The solution to the tasks is that the design is based on the principle, according to which, if possible, massive elements that interfere with the free expansion of less massive heated areas are excluded. Results. The relationship between the design parameters of various types of brakes and their operational parameters is established. Originality. It was determined that the design and operational parameters of the brakes depend on the density of the heat flow that penetrates the rims of the pulley and the drum, as well as the body of the disc. O. I. Volchenko proposed three theorems to establish the regularities of heating and cooling of isotropic metal friction elements with compliance with the initial and boundary conditions for metal-polymer friction pairs of brakes. Practical value. The use of a new operating parameter, which is the gradient of braking moments developed by friction pairs "brake pulley - friction lining", allows to estimate their values for each friction lining of the brake belt.