ТО THE QUESTION OF THE EVALUATION OF THERMAL BALANCE OF SOLID DISCS OF BRAKES IN THE SUBCATEGORY OF VEHICLES
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 80, Issue
Abstract
The tribological system, to which the disk-and-shoe brake relates, is a complex system with its hierarchical ordering. This system consists of a set of subsystems that interact with each other in a single field. The latter occurs as a result of the frictional interaction of brake friction pairs during their electrothermomechanical loading. The latter is accompanied by dynamic, electri-cal, thermal and chemical processes, phenomena and effects that are observed in the surface and subsurface layers of materials of the friction unit. The method of heating and cooling brake discs of the front axle (as most heavily loaded) of the vehicle is carried out in laboratory and operational conditions in four stages. First step. In laboratory conditions heat losses are determined by radiation and natural convective heat exchange from a heated brake disk with a flange. Second phase. In laboratory conditions heat losses are determined by radiation and natural convective heat exchange from the surfaces of the heated first brake disk with a flange. The third stage. Under operational conditions, heat losses are determined by conduc-tive heat exchange from parts of the surfaces of the flanges of the brake discs when they in-teract with the surfaces of the hub flanges of the vehicle's front axle. The fourth stage. Under operational conditions, heat losses are determined by forced convective and radiative heat transfer from the surfaces of heated self-ventilated brake discs of the vehicle's rear axle. Thus, in the laboratory and operating conditions, heating and cooling of the brake discs are carried out, which allowed to determine heat losses with radiation, natural and forced convection heat exchange from their surfaces to the environment, and conductive heat exchange from disk flanges to flanges of the rear axle of the vehicle.
Authors and Affiliations
М. O. VOLCHENKO, D. A. VOLCHENKO, V. S. SCRYPNYK, О. М. VUDVUD
Keywords
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