Abstract
The paper is devoted to theoretical studies of the feasibility to determine the clearance size in the friction units of an internal combustion engine by the magnitude of the electromotive force (EMF) that arises in them. The effect of the contact area of the friction pairs and the clearance between them on the electrical resistance in the contact, and, accordingly, on the magnitude of the emerging EMF was theoretically confirmed. As a result of the theoretical studies, the relationship of the influence of changing clearances on the magnitude of the EMF arising in them was established. To confirm the theoretical calculations, bench studies of the UMZ-417 engine were carried out to determine the magnitude of the EMF arising in its friction pairs depending on the change in the crankshaft rotation speed, followed by micrometry of the parts. The study was carried out using the designed current collector. The obtained theoretical and experimental results confirm the feasibility of determining the condition of friction units by the magnitude of the EMF generated in them and with sufficient accuracy to determine the dynamics of the clearance size between rubbing parts.
Highlights
The most significant cause for the decrease in the efficiency and durability of the friction units of any mechanism is the wear of its contact surfaces
It can be assumed that, knowing the magnitude of the arising electrical quantities in the friction surfaces, it is possible to assess the condition of these friction units
To confirm the obtained analytical relationships, the change in the magnitude of the electromotive force (EMF) was theoretically determined depending on the change in the clearance size between the surfaces of the friction unit (Fig. 2)
Summary
The most significant cause for the decrease in the efficiency and durability of the friction units of any mechanism is the wear of its contact surfaces. The most important unit in transport and traction machines is the source of its energy the engine It consists of a set of different friction units, the surfaces of which, during operation, carry out various reciprocal displacements, characterized by a wide range of load and multidirectional speed modes. It is known from the theory of solid state physics that the reciprocal interaction of rubbing surfaces is accompanied by the action on the particles of the material from which the surfaces are made, causing their oscillatory and wave motion. It can be assumed that, knowing the magnitude of the arising electrical quantities in the friction surfaces, it is possible to assess the condition of these friction units
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