Model testing of the internal leaks of valve body in automatic transmission

• Autorzy: Dziubak T. , Szczepaniak P.

Identyfikatory

DOI

10.5604/01.3001.0010.3077

• Języki publikacji: EN

Abstrakty

EN

The article presents the working conditions and the functions of the ATF fluid in an automatic transmission. It was noted that the correct operation of the automatic transmission is heavily influenced by the quality of the ATF fluid, which operates in disadvantageous conditions of oxidising environment, is subject to contamination and undergoes intense shearing, thus changing its physical and chemical properties during use. The analysis included the disadvantageous, from the point of view of loss of fluid pressure in the automatic transmission’s hydraulic system, phenomenon of the fluid’s flow through fractures (clearances) of the hydraulic precise pairs “called the rate of flow through internal leaks” or an “internal leak”. The model of the rate of flow through internal leaks was proposed to determine the impact of the precise pairs’ wear and the hydraulic fluid’s properties on the aggregated leaks in the hydraulic system controller of the automatic transmission. The modelling utilised the dependency between the rate of flow through internal leaks of the hydraulic precise pair and the coaxial circular fracture. The model’s assumptions were formulated. The values of clearances of the electrohydraulic controller’s precise pairs were determined during the measurements of the actual structure – based on the automatic transmission’s mileage. The measurements featured relevant diameters of pushers and sliders, as well as internal diameters of cylindrical openings of manifold sliders and hydraulic suppressors. Variant model testing was conducted with various degrees of the fluid’s wear and temperature (viscosity and density) for conditions of driving with transmission “1” and “2”.

Słowa kluczowe

EN

automatic transmission; hydraulic system; hydraulic precise pair; wear of hydraulic couplings; internal leaks; ATF fluid flow rate model

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2017
• Tom: Vol. 24, No. 3
• Strony: 71--78
• Opis fizyczny: Bibliogr. 21 poz., rys.

Twórcy

autor

Dziubak T.

• Military University of Technology, Faculty of Mechanical Engineering Gen. Sylwestra Kaliskiego Street 2, 00-908 Warsaw tel.: [phone], fax: [phone]

autor

Szczepaniak P.

• Air Force Institute of Technology Ksiecia Boleslawa Street 6, 01-494 Warsaw tel.: [phone], fax: [phone]

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).