MODELING THE RESOURCE OF HAUL MECHANISMS OF PASSENGER VEHICLES WITH THE PROMINATION OF THEIR FRICTIONS

Abstract

The article considers the process of wear of the friction surfaces of disc brakes, taking into account their designparameters, the coefficient of wear resistance of materials, the initial braking speed of the car, the amount of mileage andits braking distance during this period, which are used to estimate the resource of braking mechanisms.For this, a systematic approach was used, a rational combination of experimental research and analysis of knowntheoretical scientific results of I.V. Kragelsky on the theory of friction and wear.It is known that in order to estimate the resource of braking mechanisms of motor vehicles, it is important to establishthe amount of permissible wear of friction surfaces that form frictional contact.The authors established the regularity of changes in the wear of the friction surfaces of disc brake mechanismsdepending on the friction radius, the kinematic rolling radius of the wheel, the amount of drive pressure and the brakingdistance of the car.It is important to assess the service life of brake mechanisms of passenger cars in operation is to establish thepermissible relative wear of individual parts and couplings of brake mechanisms. Since the most responsible part of thecar's braking system, which is the brake mechanism, works in different conditions of wear, then establishing the relativewear of the coupled parts that create friction, depending on the change in its geometric parameters and operating modesduring operation, is an urgent task.A predictive assessment of the resource of brake mechanisms of the front and rear axles of passenger cars is provided,which is proposed to be carried out based on the indicator of the relative wear of the friction surfaces. It is shown on theexample of Chevrolet Aveo passenger cars that the relative wear of the brakes of the front axle is maximum and variesbetween 22.5-26.1%, while the relative wear of the brakes of the rear axle is 21.0-22.5%. The resource of the brake discis 4.44 times greater than the resource of the friction pad, while this indicator is 4.76 for the rear axle.