This paper presents the results of testing a wear-resistant ceramic coating on the work surface of an internal combustion engine (ICE) cylinder’s sleeve. A combined coating formation technology is described that consists in applying an aluminum layer to the sleeve’s work face by gas dynamic spraying and then covering this face with a ceramic layer by microarc oxidation (MAO). A tenfold reduction in the reinforced sleeve has been determined by the accelerated comparative wear rig tests of reference (new) sleeve-piston ring coupling specimens and reinforced specimens with a combined coating. The supplementation of nanoparticle admixture to MAO coating reduces the friction factor between the cylinder sleeve face and the piston ring by 25-30%. The proposed technology can be used to reinforce work surfaces of new cylinder sleeves and recover worn out ones.

Introduction.The article presents the results of the research, whose purpose was to determine the optimal value of the recycling fee for decommissioned self-propelled machinery. A review of the studies on the management of production and consumption waste in the leading countries and Russia, allowed us to analyze solutions to this problem and models of economic support for disposal systems of decommissioned equipment. There is no method of determining the optimal recycling fee in Russia so far. Materials and Methods.Methods, algorithm and computer programs were developed to solve this problem. The necessary information was obtained by the course of the survey conducted in 12 regions of Russia among agricultural enterprises using agricultural machinery and equipment of specialized production, and from tests at agricultural enterprises using this technology; the methods of the said information are shown. The paper gives a list of parameters that ensure the development of the algorithm and computer programs that were used to determine the optimal recycling fee. Results. The developed method of determination, algorithm and computer programs allowed determining the optimal recycling fee to create a system of recycling self-propelled technology. It is shown that as the system for recycling decommissioned equipment develops, this value will decrease. The results of the study were used in preparing a Russian Government Regulation. Discussion and Conclusion. The results of the study showed that the recycling fee affects the competitiveness of self-propelled equipment. Both positive and negative sides of increasing the introduced in Russia recycling fee for vehicles are considered. It is proved that it is necessary to create a system of recycling these vehicles, the economic base of which can be fully provided by the recycling fee introduced in Russia.

Introduction. The article describes an algorithm for determining the system of tolerances for ensuring reliable operation of parts on the section. The block diagram of the program for determining the variable tolerances is demonstrated. There determined blocks of initial information − broken and smooth curves of the controlled parameter, histogram and graph of resource distribution and definition of active area of control, and blocks of building graphs of “marginal fan curves of wear” and systems of admissions for objects of study of two types: for universal fuel pump (UTN-5) and four-section small-sized fuel pump with mechanical regulator. Two ways of determining the system of tolerances are suggested. Variant 1 is a graphical way through constructing “limit fan curves of wear” and determining tolerances by the value of ordinates in the control points. Variant 2 is an analytical way. There is created a formula to replace the graphical method for determining system tolerances. Materials and Methods. Two models of high-pressure pump were selected as objects of the study. Nominal and limit values of parameters were known for the pumps. Schedules for checking and equation of wear curves are determined. Dependencies describing the pump plunger pair wear curves are determined. A histogram and graph for determining pump life cycles are drawn. The active area of control is determined with a given failure probability coefficient. Results. As a result of the study the values for the tolerances system of two types of high pressure fuel pumps are obtained. Reliability values for one pump type are determined. Graphic and analytical algorithms for determining the system of tolerances by the formula are developed. Discussion and Conclusion. The study approves the possibility of using the variable tolerance as a basis for determining the system of tolerances and reliability indicators of the diagnostic object.