Theoretical Investigation of Friction Forces between Vane Tip and Cam-Ring in Oil Vane Pumps
International Journal of Science, Technology and Society
Volume 2, Issue 5, September 2014, Pages: 121-128
Received: Aug. 19, 2014;
Accepted: Sep. 1, 2014;
Published: Sep. 20, 2014
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Mohamed Elashmawy, Mechanical Engineering Department, Engineering College, University of Hail, Hail, Saudi Arabia; Engineering Science Department, Faculty of Petroleum and Mining Engineering, Suez University, Suez, Egypt
Oil type used for oil vane pumps is an essential element affecting its performance. Trying to understand oil type effect and proper oil type selection will lead to significant enhancement of oil pump performance and increase its life time. In order to accomplish this task, a simple thermo-elasto-hydrodynamic lubrication (TEHL) model was used to calculate the friction forces between vane tip and cam-ring. Effect of oil temperature, vane relative speed, normal vane force, and oil film thickness were theoretically investigated for different oil types. Navier-Stokes and energy equations were numerically solved using finite difference technique. Viscosity and density distributions as a function of oil pressure and temperature were taken into consideration. Results show that proper oil type selection and its operating temperature are key parameters that significantly affecting the vane pump performance. The vane relative speed is quit important parameter affecting the coefficient of friction and should not be less than 5 m/s. increasing of lubricant film thickness is not necessarily enhances the friction coefficient between van tip and cam-ring. The study shows that the best type of oil for vane pump in some operating conditions is not necessarily the best choice for this pump in other operating conditions. It may be helpful for designers to select more than one oil type for the same pump according to its operating conditions.
Theoretical Investigation of Friction Forces between Vane Tip and Cam-Ring in Oil Vane Pumps, International Journal of Science, Technology and Society.
Vol. 2, No. 5,
2014, pp. 121-128.
M. Elashmawy, “Study of Vane Tip Friction in Oil Vane pump,” Suez Canal University Dissertation, Egypt, 2009.
M. Elashmawy, and H. Murrenhoff, “Experimental Investigation of friction force between vane tip and cam-ring in oil vane pumps,” International Journal of Fluid Power, Vol. 10, No. 1, pp 37-46, 2009.
P. C. Sui, “Prediction of film thickness and friction at a rotary pump blade and liner interface,” American Society of Mechanical Engineering (ASME), Vol. 72, ASME, New York, pp.115-122, 1995.
M. Panek, “Vane pump control in order to maintain liquid friction and leak tightness,” International Capathian Conference ICCC, Zakopane, Poland, 2004.
Y. Inaguma, “Theoritical Analysis of Mechanical Efficiency in Vane Pump,” JTEKT Engineering Journal English Edition, No. 1007E,; pp. 28-35, 2010.
Y. Inaguma, and N. Yoshida, “Variation in Driving Torque and Vane Friction Torque in a Balanced Vane Pump,” SAE Technical Paper, 2014-01-1764, 2014.
Y. Inaguma, and A. Hibi, “Reduction of friction torque in vane pump by smoothing cam ring surface,” Proceedings of the Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science, 221 (5), pp. 527-534, 2007.
H. M. Gabriel, et al., “Improved component performance of vane pumps by ion-plated TiN coatings,” Elsevier, Thin Solid Films, 108 189-197, 1983.
Y. Inaguma, “Oil temperature influence on friction torque characteristics in hydraulic,” Proc IMechE Part C: J Mechanical Engineering Science 226(9); pp. 2267-2280, 2011.
Y. Inaguma and N. Yoshida, “Mathematical Analysis of Influence of Oil Temperature on Efficiencies in Hydraulic Pumps for Automatic Transmissions,” SAE Int. J. Passeng. Cars - Mech. Syst. 6(2):786-797, doi:10.4271/2013-01-0820, 2013.
P. W. Gold, “Tribology,” Umdruck zur Vorlesung, Trans-Aix-Press, Aachen, Germany, 2003.
J. Blume, “Druck und Temberatureinfluß auf Viscosität und Kompressibilität von flüssigen Schmierstoffen,” RWTH Aachen University Dissertation, 1987.