Abstract
Our research into the formation of a functional copper-containing surface layer on parts of automobile engines by using an alignment tribotechnology has established a decrease in the wear of parts during their operation. It was found that the formed coating creates an elastic layer that reduces strains in a material of engine parts. Our experimental study of the coercive force of parts' working surfaces has confirmed a decrease in the accumulation of destructive stresses in the near-surface layers of a components' material. In turn, a comparative analysis of the obtained results by using a coercimetric method confirms that the proposed aligning tribotechnology leads to reduction of the stressed-strained state and makes it possible to improve wear resistance and enhance the technical condition of diesel engine cylinder liners: the magnitude of coercive force reduces by 7.5 %, while operating time increases by 16 %. In this case, at larger operating time: 254.8 thousand km against 220.5 thousand km, according to data on the coercive force (14.2…9.1) A/cm and (13.2…9.0) А/cm, it is almost in the same condition.The functional surface layer forms when introducing a composite oil to the tribotechnology of cold alignment of an automobile powertrain. We have proposed and implemented a circuit to connect electric current to components at an engine's cylinder-piston group as a result of studying the developed tribotechnology of alignment. The features of this scheme are that the constant electric current is supplied by the plus polarity, through the brush-collector node, to the crankshaft, and by the minus polarity, through the clamping contact, to the crankcase block.The research results suggest a possibility to control the internal strains and the subsequent magnitude of wear in a material of working heavily-loaded components of automobile powertrains provided they are serviced properly. The proposed tribotechnology of alignment could be of interest for both service departments at trucking companies and for car service stations.
Highlights
At present, the reliability of systems and assemblies of cars is improved by selecting wear-resistant structural materials, by choosing oils for them, and by creating conditions for liquid lubrication of mating parts [1]
The aim of this study is to reduce the stressed state of parts in diesel engine vehicles during operation, based on a comprehensive study of the technology of tribological alignment of mating parts with the formation of functional copper-containing surface layers on cylinder liners
The intensity of wear of the cylinder liners at operating duration of 112 thousand km was 2.5∙10–6 mm/km, and at 220.5 thousand km – it increases by 1.36 times and amounts to 3.4∙10–6 mm/km
Summary
The reliability of systems and assemblies of cars is improved by selecting wear-resistant structural materials, by choosing oils for them, and by creating conditions for liquid lubrication of mating parts [1]. High electrical conductivity of these materials leads to the rapid triboelectrication of surface layers, which induce an electric field that could affect the wear particles and additives This effect is characterized positively during the period of working operation of additives, but at an increase in the number of wear particulate and the additives’ wear a given effect manifests its negative side. One of the ways to eliminate this drawback is to create the anti-friction surface layers with high operational properties, based on steel or cast-iron, by applying the tribotechnology of alignment and restoration These technologies possess a significant advantage in the formation of the required set of operational characteristics and properties for the parts’ surface layers. The above provides for a minimum wear of mating parts, improving their durability and serviceability, which is certainly a relevant issue
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