Дослідження впливу електростатичної обробки на експлуатаційні характеристики осьової оливи

The effect of electrostatic processing on performance characteristics of axle oil is investigated. Axle oil is used for wetting motor-axial bearings (MAB) of locomotives. There is a pressing and urgent problem of the MAB service life, which is indirectly related to the underdeveloped reserves of anti-wear properties of axle oil. To study them, it was decided to use the method of electrostatic processing, which does not require the introduction of any additives and has proven its effectiveness in the studies of other mineral oils. It is based on the ability of electric fields to destroy micellar aggregates in oil and form a solid boundary layer of molecules on friction surfaces. In the context of solving the current problem of the MAB service life, this method wasn’t considered earlier.The research was carried out by means of the «roller-pad» friction pair, which was wetted with axle oil at different load conditions and operating times. The dependences of wear of the experimental samples under different load conditions, oil operating times and degrees of electric processing are obtained.The results show that when using axle oil subjected to ESP, the wear rate of the experimental samples is reduced. Wear rate reduction depends on the oil operating time in the lubrication system. The greatest wear rate reduction of 1.92 times is noted for fresh oil. For the oil state after the locomotive run of 75 thousand km, the reduction is about 1.68 times and for the oil at the end of its service life, wear rate reduction is approximately 1.47 times.Получены результаты изменения эксплуатационных характеристик осевого масла на разных этапах наработки и при использовании метода электростатической обработки. Исследования проводились на паре трения «ролик-колодка», которая смачивалась осевым маслом на различных режимах нагрузки и степенях наработки. Получены зависимости износа экспериментальных образцов при различных режимах нагрузки, наработки масла и степени электрообработкиОтримані результати зміни експлуатаційних характеристик осьової оливи на різних етапах напрацювання та при застосуванні методу електростатичної обробки. Дослідження проводились на парі тертя «ролик-колодка», яка змочувалася осьовою оливою на різних режимах навантаження та ступенях напрацювання. Отримані залежності зносу експериментальних зразків при різних режимах навантаження, напрацювання оливи та ступеня електрообробк

The influence of external field on the lubricity of mineral oil for railway transport

The use of mineral oil is associated with its gradual operational degradation caused by its natural aging and contamination with various impurities. As the concentration of impurities increases, the number of active surface molecules which determine the operational properties of mineral oils decreases. A promising method of recovery of the operational properties of oils is the treatment with an electric field, which makes it possible to enhance the activity of surfactants in the tribo-contact area. This statement is proved through the improvement of the wettability of the bronze surface with mineral oils after their treatment with an electrostatic field. However, the method of electrical treatment is associated with the need to increase the requirements for the purity of liquids, especially to the presence of water, which requires creating an oil pre-treatment system. As an alternative, a method of electrical treatment with special field parameters is proposed enabling to accelerate the coalescence process. The major parameter that accelerates the coalescence process is the electric field oscillation frequency. The results of the study give grounds for choosing the optimal field parameters

The influence of external field on the lubricity of mineral oil for railway transport

The use of mineral oil is associated with its gradual operational degradation caused by its natural aging and contamination with various impurities. As the concentration of impurities increases, the number of active surface molecules which determine the operational properties of mineral oils decreases. A promising method of recovery of the operational properties of oils is the treatment with an electric field, which makes it possible to enhance the activity of surfactants in the tribo-contact area. This statement is proved through the improvement of the wettability of the bronze surface with mineral oils after their treatment with an electrostatic field. However, the method of electrical treatment is associated with the need to increase the requirements for the purity of liquids, especially to the presence of water, which requires creating an oil pre-treatment system. As an alternative, a method of electrical treatment with special field parameters is proposed enabling to accelerate the coalescence process. The major parameter that accelerates the coalescence process is the electric field oscillation frequency. The results of the study give grounds for choosing the optimal field parameters