International Journal of Mechanical Engineering and Applications
Volume 3, Issue 1-2, January 2015, Pages: 24-29
Received: Nov. 24, 2014;
Accepted: Nov. 26, 2014;
Published: Dec. 27, 2014
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Mohamed Elashmawy, Engineering College, University of Hail, Hail, Saudi Arabia; Engineering Science Department, Faculty of Petroleum and Mining Engineering, Suez University, Suez, Egypt
Abdulaziz Alghonamy, Engineering College, University of Hail, Hail, Saudi Arabia
Isam Elbadawi, Engineering College, University of Hail, Hail, Saudi Arabia
Swashplate axial piston machines are simple, compact and low price. This simplicity is at the expense of piston transverse forces which limits machine characteristics. The aim of this study is to propose more effective developed design using roller piston bearing. Ball bearing was proposed to reduce transverse forces acting on the piston end of the axial piston machines. The proposed roller bearing design will provide line contact bearing between roller and cam contour compared to point contact of ball bearing arrangement. The roller runs on a flat surface contour formed on the swashplate which is simpler in manufacturing process. The sliding friction between swashplate and slipper is replaced by a rolling friction between roller and runway of cam surface contour. Results show the feasibility of the developed design. The proposed design promises to increase the pressure limitation of the ball bearing arrangement. Parameters such as piston displacement, cam action angle are the same for both roller and ball piston bearing. A comparison analysis was also performed between two alternative cam contours, sinusoidal and linear piston displacement. The selection criterion was based on piston transverse torque. Results show that sinusoidal piston displacement is much better choice than the linear one.
Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing, International Journal of Mechanical Engineering and Applications. Special Issue: Advanced Fluid Power Sciences and Technology.
Vol. 3, No. 1-2,
2015, pp. 24-29.
Hubertus Murrenhoff, “Grundlagen der Fluidtechnik teil 1: Hydraulik, Umdruck zur Vorlesung, ,” Shaker Verlag GmbH, Germany (2005).
A. Schenk, M. Zecchi, and M. Ivantysynova, “Accurate Prediction of Axial Piston Machine Performance Through a Thermoelastohydrodynamic Simulation Model,” In: ASME Symp. FPMC (2013) 2013-4456.
Stefan Gels and Hubertus Murrenhoff, “Simulation of the lubricating film between contoured piston and cylinder, International Journal of Fluid Power IJFP,” Vol. 11. No. 2 (2010) 15-24.
Hubertus Murrenhoff and Stephan Sharf, Wear and Friction of ZRCG-Coated Pistons of Axial Piston Pumps, International Journal of Fluid Power IJFP,” Vol. 7. No. 3 (2006) 13-20.
Monika Ivantysynova and Jonathan Baker, “Power Loss in the Lubricating Gap between Cylinder block and Valve Plate of Swash Plate Type Axial Piston Machine,” International Journal of Fluid Power IJFP, Vol. 10. No. 2 (2009) 29-44.
Yeh-Sun Hong, Sang-Yul Lee, Sung-Hun Kim, Hyun-Sik Lim, “Improvement of the low-speed friction characteristics of a hydraulic piston pump by PVD-coating of TiN,” Springer, Journal of Mechanical Science and Technology (KSME Int. J.), Vol. 20 No. 3, (2006) 358-365.
Sang-Yul Lee and Yeh-Sun Hong, “Effect of CrSiN thin film coating on the Improvement of the Low-Speed Torque efficiency of Hydraulic Piston Pump,” Science Direct, Surface &Coatings Technology 202 (2007) 1129-1134.
J.M. Bergada D. Davies, S. Kumar, J. Watton, “The Effect of Oil Pressure and Temperature on Barrel Film Thickness and Barrel Dynamics of an Axial Piston Pump,” Springer, Mechanica, (2011)
S. Kumar, J. Bergada, J. Watton, “Axial piston pump grooved slipper analysis by CFD simulation of three-dimensional NVS equation in cylindrical coordinates, Elsevier,” Computers & Fluids, 38, (2009) 648-663.
J. Bergada, J. Watton, J. Haynes, D. Davies, “The Hydrostatic/Hydrodynamic Behaviour of an Axial Piston Pump Slipper with Multiple Lands,” Springer, Mechanica, 45, (2010) 585-602.
XU Bing, ZHANG JunHui and YANG HuaYong, “Investigation on structural optimization of anti-overturning slipper of axial piston pump,” Sci China Tech Sci, 55, (2012) 3010-3018, doi: 10.1007/s11431-012-4955-x.
Andrew Schenk and Monika Ivantysynova, “A transient fluid structure interaction model for lubrication between the slipper and swashplate in axial piston machines,” The 9th International Fluid Power Conference, 9. IFK, March 24-26, Aachen, Germany, (2014)
John D. North, Reciprocating pistons for pumps and motors, United States Patient Office, US 3356037A, (1967).
Christian Spielvogel, Axial piston machines having a swashplate design. United States Patient Office, US 2012/0279387 A1, (2012).
Yong Kwun Lee, Soo Jun Lee and Hyeon Min Lee, Micro Compressor. United States Patient Office, US 8,727,742 B2, (2014).