https://doi.org/10.25198/2077-7175-2020-3-126
DETERMINATION OF CONDITIONS FOR ENSURING RELIABLE LUBRICATION OF CONNECTING ROD BEARINGS OF AUTOMOBILE ENGINES
A. T. Kulakov1, E. P. Barylnikova2
Naberezhnye Chelny Institute (branch) of the Kazan Federal University, Naberezhnye Chelny, Russia
1e-mail: alttrak09@mail.ru
2e-mail: 692401@mail.ru
R. F. Kalimullin
Orenburg State University, Orenburg, Russia
e-mail: rkalimullin@mail.ru
Abstract. The relevance of the work is due to the need to study the patterns of lubrication of the connecting rod bearings of the crankshaft of an automobile engine in order to exclude the influence of various factors on the risk of cranking the bearings - sudden costly failure The aim of the article is to increase the resource of automobile engines in operation by preventing failures in the form of crank bushings based on minimizing the effect on its oc¬currence of a process of breaking the oil flow to rubbing surfaces.
Experimental studies in bench conditions based on the original method of breaking the oil flow using a motor unit based on the KamAZ-740.10 automobile engine were used as a methodological apparatus.
Key results identified conditions for lubrication of connecting rod bearings; the minimum oil pressure values were obtained depending on the load-speed mode of engine operation, at which a flow break occurs and oil con rod bearings may starve.
The scientific novelty of this article is that the oil flow rupture technique was first applied to investigate the conditions for the occurrence of a pre-failure condition of connecting rod bearings and to justify the diagnostic parameter of their limiting state.
The practical importance in applying the oil flow discontinuation technique allowed substantiating the recom-mendation to exclude the oil distribution sleeve of a centrifugal trap from the crankshaft design of KamAZ engines because of its negative effect on lubrication conditions.
Using the technique of breaking the oil flow, it is possible to further evaluate changes in the lubrication con¬ditions of connecting rod bearings under the influence of operational aging and recovery processes, as well as measures to improve the lubrication system.
Key words: car engine, exploitation, crankshaft, lubrication conditions, flow gap, turning of connecting rod inserts, pressure, oil distribution sleeve, centrifugal trap.
Cite as: Kulakov, A. T., Barylnikova, E. P., Kalimullin, R. F. (2020) [Determination of the conditions for ensuring reliable lubrication of connecting rod bearings of automobile engines]. Intellekt. Innovatsii. Investitsii [Intellect. Innovations. Investments.]. Vol. 3, рр. 126–134. DOI: 10.25198/2077-7175-2020-3-126.
