ДО ПИТАННЯ РОЗРАХУНКУ І ПРОЕКТУВАННЯ РІЗНИХ ТИПІВ ДИСКІВ ДЛЯ ГАЛЬМ ПІДКАТЕГОРІЙ АВТОТРАНСПОРТНИХ ЗАСОБІВ

In disk-block brakes use both solid and self-ventilated discs with a developed system of ventilation holes and channels in the body of the disc with polished and matte its side surfaces. These surfaces interact with high-speed streams of washing air during vehicle traffic, thereby reducing the energy loading of brake discs with cooling elements on their friction belts holes and grooves angled and fan-shaped. However, the cooling capacity of the self-ventilated disc is reduced at high vehicle speeds through increase in the static pressure of the washing air According to the developed method for assessing the effectiveness of a self-ventilated disk In the first stage, in the mode of movement and braking of the lorry, the ratio of the total area of ​​the ventilation openings to the reduced area of ​​the ventilation duct is checked. In the second stage, the stress state of the constituent elements of the serial self-ventilated brake disc. On the third stage, the laws of influence of coefficients mutual overlapping of friction pairs of a motor vehicle brake. At the fourth stage, the efficiency of the cooling elements of self-ventilated brake discs, whose friction pairs are equipped with thermocouples with thermoelectrons connected to the recording equipment, in the modes of movement and braking of a freight vehicle, are checked by calculation and experimental means and the relationships are checked. Thus, the possibility of obtaining rational parameters of various types of brake discs, based on their thermal resistance, is illustrated. The selection of various types of brake discs is made from the condition of energy loading of the friction belts and the coefficient of thermal conductivity that corresponds to their materials.