The article discusses the dynamics of the lubrication process during the operational wear of the crankshaft bearings of automobile engines. All lubrication modes and wear processes are analyzed. The main attention is paid to the steady and unsteady modes of lubrication of the crankshaft bearings. The nature of the dynamics of changing lubrication regimes is substantiated through operational tribological parameters that characterize the integral degree of existence of the lubricating layer. A model is proposed for the relationship of these parameters with a number of factors, and the nature of their changes with a change in the speed of the crankshaft of the car engine is substantiated. The results of bench tests of diesel engines of the KamAZ series, speed and load characteristics of the engine in terms of tribological operational parameters are presented. A graphical interpretation of the tribological parameter in the field of the load-speed mode of KamAZ engines is given
For the conjugation of samples and parts of the "shaft-sleeve" type, from the theoretical and experimental points of view, the laws of the change of the coefficient of friction for the combined polymer-metal material and coating were considered. Based on the law of energy conservation and transformation in the friction zone, expressions for estimating friction coefficients for polymer coatings and combined polymer-metal materials were obtained, taking into account the properties of thermal conductivity and elasticity and the geometric dimensions of the polymer and metal components. The consistency of the patterns of change in the friction coefficient has been clarified in tribocouplings of samples and parts from load and sliding speed in modes without lubrication and at extreme friction. To substantiate the effective operation of tribocoupling of parts made of combined polymer-metal materials, a criterion was introduced - the coefficient of wear, which is used to evaluate the tribological efficiency. It is shown that the obtained experimental results do not contradict the theoretical justification
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