Article | 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden | Swash plate oscillation in a variable displacement floating cup pump
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Title:
Swash plate oscillation in a variable displacement floating cup pump
Author:
P.A.J. Achten: Innas, Breda, the Netherlands S. Eggenkamp: Innas, Breda, the Netherlands H.W. Potma: Innas, Breda, the Netherlands
DOI:
10.3384/ecp1392a17
Download:
Full text (pdf)
Year:
2013
Conference:
13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden
Issue:
092
Article no.:
017
Pages:
163-176
No. of pages:
14
Publication type:
Abstract and Fulltext
Published:
2013-09-09
ISBN:
978-91-7519-572-8
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


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The oscillation of a swash plate has been studied in a variable displacement floating cup pump. Servo valves have been designed and built into the pump. These so called ß-valves define a certain operating angle; while leaving the swash plate free to oscillate; in the same way as during real pump operation. Measurements have been performed in a wide range of operating conditions. A simulation model has been built to get a better understanding of the dynamic behaviour. The study has proven the large impact of the swivel torque of the swash plate on the pump behaviour. The swash plate oscillation creates an additional displacement of the pump; especially during commutation; which is often larger than the original sinusoidal movement. The dynamic oscillation of the swash plate therefore dominates the commutation phenomena. It has also been proven that the overall efficiency is substantially reduced if the swash plate is free to oscillate; like in real pump operation. Although this study is performed on a floating cup pump; the authors of this paper believe that these effects also occur in conventional types of pumps and motors. It is recommended that a similar study should be performed on slipper type and bent axis pumps and motors

Keywords: Variable displacement pump; floating cup principle; oscillation of the swash plate

13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Author:
P.A.J. Achten, S. Eggenkamp, H.W. Potma
Title:
Swash plate oscillation in a variable displacement floating cup pump
DOI:
http://dx.doi.org/10.3384/ecp1392a17
References:

[1] K. Inoue; and M. Nakasato; Study of the operating moment of a swash plate type axial piston pump; First report: Effects of dynamic characteristics of a swash plate angle supporting element on the operating moment; The Journal of Fluid Control; Vol. 22; Issue 1; p 7-27; 1994

[2] K. Inoue; and M. Nakasato; Study of the operating moment of a swash plate type axial piston pump; Second report: Effects of dynamic characteristics of a swash plate angle supporting element on the cylinder pressure; The Journal of Fluid Control; Vol. 22; Issue 1; p 30-45; 1994

[3] J.W. Dobchuk. Sub-component Level Modeling of a Variable Displacement Axial Piston Pump; Thesis University of Saskatchewan; Saskatoon; Canada; December 2000

[4] J.W. Dobchuk; P.N. Nikiforuk; P.R. Ukrainetz; R.T. Burton. “Effect of internal pump dynamics on control piston pressure ripple; Proc. of the 6th Triennial International Symposium on Fluid Control; Measurement and Visualization; Sherbrooke; Canada; August 13-17; 2000

[5] S.A. Kassem; M.K. Bahr. On the dynamics of swash plate axial piston pumps with conical cylinder blocks‚ÄĚ; Proc. of the 6th Triennial International Symposium on Fluid Control; Measurement and Visualization; Sherbrooke; Canada; August 13-17; 2000

[6] M.K. Bahr; J. Svodoba; R.B. Bhat. Vibration analysis of constant power regulated swash plate axial piston pumps‚ÄĚ; Journal of sound and vibration; 2003; Vol 259(5); p. 1225-1236; Elsevier Science Ltd.

[7] P.A.J. Achten; T.L Van den Brink; T. Paardenkooper; T. Platzer; H.W. Potma; M.P.A. Schellekens and G.E.M. Vael. ‚ÄúDesign and testing of an axial piston pump based on the floating cup principle‚ÄĚ; Proc. 8th Scandinavian Int. Conf. on Fluid Power SICFP‚Äô03; Vol. 2; Tampere University of Technology; pp. 805-820; 2003

[8] P. Achten. Dynamic high frequency behaviour of the swash plate in a variable displacement; axial piston pump; Proc. of the IMechE; Part I: Journal of Systems and Control Engineering; Volume 227 Issue 6 July 2013 pp. 529 ‚Äď 540; doi: 10.1177/0959651813483419

[9] P.A.J. Achten; ‚ÄúDesigning the impossible pump‚ÄĚ; Proc. Hydraulikdagar 2003; Link√∂ping University; Sweden 2003

[10] P.A.J. Achten; T. van den Brink; M. Schellekens; (2005) Design of a variable displacement floating cup pump; Proc. 9th Scandinavian Int. Conf. on Fluid Power; SICFP’05; Linköping; Sweden; 2005

13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Author:
P.A.J. Achten, S. Eggenkamp, H.W. Potma
Title:
Swash plate oscillation in a variable displacement floating cup pump
DOI:
http://dx.doi.org/10.3384/ecp1392a17
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