POWER LOSS IN THE LUBRICATING GAP BETWEEN CYLINDER BLOCK AND VALVE PLATE OF SWASH PLATE TYPE AXIAL PISTON MACHINES

Authors

  • Monika Ivantysynova Purdue University, Department of Agricultural and Biological Engineering, 225 S. University Street, West Lafayette, IN 47907, USA
  • Jonathan Baker Purdue University, Maha Fluid Power Research Center, 1500 Kepner Dr., Lafayette, IN 47906, USA

Keywords:

lubricating gaps, cylinder block-valve plate, axial piston pump, waved surface, energy dissipation

Abstract

The lubricating gaps are the primary source of energy dissipation in piston machines. The paper presents results of a simulation study that investigates the effect that a wave-like micro surface shape variation applied to the valve plate gap surface has on power loss in the cylinder block-valve plate interface. Special attention is given to the relation between gap height, operating parameters, surface design and power loss. The effect of waved surface amplitude and frequency is also studied. Results indicate that power loss in the cylinder block-valve plate interface can be reduced by over 50 % on account of the waved surface compared to the standard cylinder block-valve plate interface design. The effect of the waved surface is most significant at low operating pressures. A special in-house code has been used for this research study. The simulation model covers fluid-structure interaction and micro motion of the cylinder block resulting from oscillating piston forces. Details of the model are explained. The model predicts the pressure and velocity fields generated in the lubricating film and calculates leakage, viscous friction and power loss.

Downloads

Download data is not yet available.

Author Biographies

Monika Ivantysynova, Purdue University, Department of Agricultural and Biological Engineering, 225 S. University Street, West Lafayette, IN 47907, USA

Monika IvantysynovaBorn on December 11th 1955 in Polenz (Germany). She received her MSc. Degree in Mechanical Engineering and her PhD. Degree in Fluid Power from the Slovak Technical University of Bratislava, Czechoslovakia. After 7 years in fluid power industry she returned to university. In April 1996 she received a Professorship in fluid power & control at the University of Duisburg (Germany). From 1999 until August 2004 she was Professor of Mechatronic Systems at the Technical University of Hamburg-Harburg. Since August 2004 she is Professor at Purdue University (USA). Her main research areas are energy saving actuator technology and model based optimisation of displacement machines as well as modelling, simulation and testing of fluid power systems. Besides the book “Hydrostatic Pumps and Motors” published in German and English, she has published more than 80 papers in technical journals and at international conferences.

Jonathan Baker, Purdue University, Maha Fluid Power Research Center, 1500 Kepner Dr., Lafayette, IN 47906, USA

Jonathan Baker Born in North Carolina, Jonathan received his bachelor’s degree in Physics from Davidson College and Master’s degree in mechanical engineering from Purdue University under the guidance of Professor Monika Ivantysynova at the Maha Fluid Power Research Center. His research interests are related to pump efficiency and lubricating gap design.

References

Baker, J. 2008. Power Losses in the Lubricating Gap

between Cylinder Block and Valve Plate of Swash

Plate Type Axial Piston Machines, MS thesis, Purdue

University.

Baker, J. and Ivantysynova, M. 2008. Investigation of

Power Losses in the Lubricating Gap between Cylinder

Block and Valve Plate of Axial Piston Machines,

Proc. 5th Fluid Power Net International

PhD Symposium, Krakow, Poland, pp. 302-19.

Baker, J. and Ivantysynova, M. 2009. Advanced

Surface Design for Reducing Power Losses in Axial

Piston Machines, Proc. 11th Scandinavian International

Conference on Fluid Power, Linköping, Sweden,

Vol. 10 (2009), No. 2, pp. 15-30.

Bergada, J. M., Watton, J. and Kumar, S. 2008.

Pressure, Flow, Force and Torque Between the Barrel

and Port Plate in an Axial Piston Pump, Journal

of Dynamic Systems, Measurement and Control,

Vol. 130, pp. 011011-1-011011-16.

Berthe, D. and Godet, M. 1973. A More General Form

of Reynolds’ Equation-Application to Rough Surfaces.

Wear, Vol. 27, pp. 345-57.

Burton, R. A. 1963. Effects of Two-dimensional, Sinusoidal

Roughness on the Load Support Characteristics

of a Lubricant Film. Transactions of the

ASME, Journal of Basic Engineering, vol. 85, pp.

-64.

Dowson, D. and Ehret, P. 1999. Past, Present and

Future Studies in Elastohydrodynamics. Proceedings

of the Institution of Mechanical Engineers,

PT.J. Journal of Engineering Tribology, Vol. 213,

No. J5, pp. 317-33.

Fatu, A., Hajjam, M. and Bonneau, D. 2005. An

EHD Model to Predict the Interdependent Behavior

of Two Dynamically Loaded Hybrid Journal Bearings.

Journal of Tribology, Vol. 127, No. 2, pp.

-24.

Fredrickson, A. 2008. A Study of the Piston and Cylinder

Interface of an Axial piston Pump Using an

Advanced Computer Model. MS thesis, Purdue

University.

Hamrock, B. J., Schmid, S. R. and Jacobson, B. O.

Fundamentals of Fluid Film Lubrication, 2nd

Edition. Marcel Dekker, Inc. New York.

Hargreaves, D. J. 1991. Surface Waviness Effects on

the Load-carrying Capacity of Rectangular Slider

Bearings. Wear, Vol. 145, pp. 137-151.

Harris, M. R., Edge, K. A. and Tilley, D. G. 1993.

Predicting the Behaviour of Slipper Pads in Swashplate-

Type Axial Piston Pumps. ASME Winter Annual

Meeting, New Orleans, Louisiana. 93-

WA/FPST-3.

Huang, C. and Ivantysynova, M. 2003. A New Approach

to Predict the Load Carrying Ability of theGap Between Valve Plate and Cylinder Block. Bath

Workshop of Power Transmission and Motion Control

PTMC 2003, Bath, UK, pp. 225-39.

Ivantysyn, J. and Ivantysynova, M. 2001. Hydrostatic

Pumps and Motors. Academic Books International,

New Delhi.

Ivantysynova, M. 2001. Energy Losses of Modern

Displacement Machines - A new approach of Modelling.

Seventh Scandinavian International Conference

on Fluid Power, Linköping, Sweden, pp. 377-

Ivantysynova, M. 1999. A New Approach to the Design

of Sealing and Bearing Gaps of Displacement

Machines. Fourth JHPS International Symposium

on Fluid Power, Tokyo ’99, pp. 45-50.

Ivantysynova, M., Huang, C. and Behr, R. 2005.

Measurements of Elastohydro-Dynamic Pressure

Field in the Gap Between Piston and Cylinder. Bath

Workshop on Power Transmission and Motion Control

PTMC 2005, Bath, UK, pp. 451-465.

Jouini, N. and Ivantysynova, M. 2008. Valve Plate

Surface Temperature Prediction in Axial Piston

Machines. Proc. 5th Fluid Power Net International

PhD Symposium, Krakow, Poland, pp. 95-110.

Lasaar, R. and Ivantysynova, M. 2005. An Investigation

into Micro- and Macrogeometric Design of Piston/

Cylinder Assembly of Swash Plate Machines.

International Journal of Fluid Power, Vol. 5, no. 1,

pp. 23-36.

Lebeck, A. O., Teale, J. L., and Pierce, R. E. 1978.

Hydrodynamic Lubrication and Wear in Wavy Contacting

Face Seals. Journal of Lubrication Technology,

Vol. 100, pp. 81-91.

Lebeck, A. O. and Young, L. A. 1989. Wavy-Tilt-

Dam Seal Ring. US Patent 4836561.

Manring, N. D. 2000. Tipping the Cylinder Block of

an Axial-Piston Swash-Plate Type Hydrostatic Machine.

Journal of Dynamic Systems, Measurement

and Control, Vol. 122, pp. 216-221.

Patir, N. and Cheng, H. S. 1978. An Average Flow

Model for Determining Effects of Three Dimensional

Roughness on Partial Hydrodynamic Lubrication.

ASME Journal of Lubrication Technology,

Vol. 100, pp. 12-17.

Pelosi, M. and Ivantysynova, M. 2009. A Novel

Fluid-Structure Interaction Model for Lubricating

Gaps of Piston Machines. Proceedings of the Fifth

Fluid Structure Interaction Conference, Crete. pp.

-24.

Rasheed, H. 1998. Effect of Surface Waviness of the

Hydrodynamic Lubrication of a Plain Cylindrical

Sliding Element Bearing. Wear, Vol. 223, pp. 1-6.

Roccatello, A., Mancò, S. and Nervegna, N. 2007.

Modelling a Variable Displacement Axial Piston

Pump in a Multibody Simulation Environment.Journal of Dynamic Systems, Measurement and

Control, Vol. 129, pp. 456-468.

Ruddy, A. V., Dowson, D. and Taylor, C. M. 1982.

The Prediction of Film Thickness in a Mechanical

Face Seal with Circumferential Waviness on both

the Face and the Seat, Journal Mechanical Engineering

Science, Vol. 24, no. 1, pp. 37-43.

Vaidya, A. and Sadeghi, F. 2008. Hydrodynamic Lubrication

of Scroll Compressor Thrust Bearing with

Grooves and Circular Pockets. Proc. ASHRAE Annual

Meeting, Salt Lake City, USA.

Yu, T. H. and Sadgehi, F. 2001. Groove Effects on

Thrust Washer Lubrication. Journal of Tribology,

Vol. 123, pp. 295-304.

Wieczorek, U. and Ivantysynova, M. 2002. Computer

Aided Optimization of Bearing and Sealing Gaps in

Hydrostatic Machines - The Simulation Tool CASPAR.

International Journal of Fluid Power, Vol. 3,

No. 1, pp. 7-20.

Wohlers, A. and Murrenhoff, H. 2007. Tribological

Simulation of a Hydrostatic Swash Plate Bearing in

an Axial Piston Pump. Bath Workshop on Power

Transmission and Motion Control PTMC 2007,

Bath, UK, pp. 129-141.

Zhao, H., Choy, F. K. and Braun, M. J. 2005. Dynamic

Characteristics and Stability Analysis of a

Wavy Thrust Bearing. Tribology Transactions,

:1, pp. 133-139.

Downloads

Published

2009-08-01

How to Cite

Ivantysynova, M., & Baker, J. (2009). POWER LOSS IN THE LUBRICATING GAP BETWEEN CYLINDER BLOCK AND VALVE PLATE OF SWASH PLATE TYPE AXIAL PISTON MACHINES. International Journal of Fluid Power, 10(2), 29–43. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/498

Issue

Section

Original Article

Most read articles by the same author(s)

<< < 1 2