Friction losses in a linear hydraulic motor as a result of the influence of the control structure and oil viscosity

• Autorzy: Skorek G.

Identyfikatory

DOI

10.5604/01.3001.0012.4813

• Języki publikacji: EN

Abstrakty

EN

The problem of energy tests of hydraulic systems with hydraulic cylinders, seemingly simple displacement machines, is more complex than that of rotary hydraulic systems. The results of the researches provide an insight into the impact of external loads, required speed, structure of the power supply system, viscosity of hydraulic oil on friction loss, and the efficiency of cylinder drive. The hydraulic cylinder is the strongest structure in the system. Failure of the system is most likely due to failure of the pump supplying the cylinder. The high load of the pump is often caused by the very low energy efficiency of the cylinder, which, despite a relatively low external load, requires high inlet pressure due to large mechanical losses of friction between the piston and the cylinder and between the piston rod and gland. These losses depend on the type of seal used, its shape, the material it is made from, pre-clamp, and the operating parameters of the cylinder. Improperly sealed or assembled seals can cause energy losses of up to 25%. Due to the use of moving seals in the hydraulic cylinder, its energy behaviour is completely different compared to the energy behaviour of a rotary motor, which does not have any seals. The friction force connected with the work of the sealing joints and the mechanical efficiency of the cylinder are determined not only by the external load but also by the method of the applicable supply of the cylinder resulting from the throttling structure, and in particular the pressure level generated in the discharge chamber of the cylinder.

Słowa kluczowe

EN

friction force; mechanical losses; energy efficiency; oil viscosity; hydrostatic drive; hydraulic cylinder

• 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: 2018
• Tom: Vol. 25, No. 4
• Strony: 377--384
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Skorek G.

• Gdynia Maritime University Department of Engineering Sciences Faculty of Marine Engineering Morska Street 81-87, 81-225 Gdynia, Poland

Bibliografia

• [1] Paszota, Z., Energy losses in hydrostatic drive. Monography, LAP Lambert, Acadamic Publishing, p. 570, Saarbrucken 2015.
• [2] Piątek, D., Study of energetic behaviour of the cylinder as a result of the throttling control structure, VII Conference: Shipbuilding and Ocean Engineering, Integrated Transport, University Publishing, pp. 184-192, Gdansk 2004.
• [3] Pietrzak, M., Okularczyk, W., The efficiency of the hydraulic cylinder, Hydraulics and ,Pneumatics, No. 2, pp. 21-24, Wroclaw 2012.
• [4] Skorek, G., Energy characteristics of a hydraulic system with proportional control of a cylinder powered by a constant capacity pump in constant and variable-pressure systems, ,Doctors thesis, p. 253, Gdansk 2010.
• [5] Skorek G., Energy efficiency of hydrostatic drive, Hydraulics and Pneumatics, No. 6, pp. 7-11, Gdansk 2013.
• [6] Skorek, G., Hydrostatic systems with throttling control, Hydraulics and Pneumatics, No. 5, pp. 16-21, Gdansk 2014.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).