Problems of Tribology = Проблеми трибології

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https://elar.khmnu.edu.ua/handle/123456789/7604

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Перегляд Problems of Tribology = Проблеми трибології за Автор "Dykha, M. O."

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  • Ескіз
    Документ
    Probabilistic approach to assessing tribotechnical reliability indicators of friction units
    (Хмельницький національний університет, 2025) Dykha, M. O.; Dytyniuk, V. O.; Staryi, A. L.
    The article presents a theoretical and analytical review of the probabilistic approach to assessing the tribotechnical reliability of mechanical systems, in particular friction units. The influence of the random nature of loads and wear on the reliability of machine elements is considered. The feasibility of using distribution functions and probability density functions to describe the wear process is substantiated. Mathematical models are described in detail that allow determining the probability of element failure for given statistical characteristics of the load and permissible wear. Both constant and block load conditions are taken into account. The results of the study can be used in the design and operation of highly reliable tribotechnical systems, as well as for predicting their resource under conditions of operational uncertainty.
  • Ескіз
    Документ
    Wear resistance and lubricity of the spiral oil distribution profile of the valve guide sleeves of an internal combustion engine
    (Хмельницький національний університет, 2024) Dykha, O. V.; Vychavka, A. A.; Dykha, M. O.
    Valve guides are crucial for maintaining the correct alignment, positioning, and clearance of the valve stem as it moves in the cylinder head. When the guides are heavily worn, the engine begins to consume oil and the valve mechanism becomes noisy. Reliable lubrication of the inner surface of the guide bushing ensures the wear resistance of the valve-guide pair. This work proposes a special tool and technology for obtaining an oil-retaining profile on the inner surface of the valve guide, which increases the oil capacity of the surface, and therefore improves the lubrication conditions in the valve-guide friction pair. A gas labyrinth seal is created in the connection, which prevents oil from entering the combustion chamber. The surface of the bushing bore is strengthened due to the sealing of the surface. The results of wear tests of guide bushings with spiral oil-retaining grooves confirmed their effectiveness in terms of wear resistance. The wear rate of the bushings with grooves for the entire time range of the tests is on average 20% less than the wear rate of the bushings without grooves.