VALVING LAND PHENOMENA OF THE INNAS HYDRAULIC TRANSFORMER

Authors

  • Peter A. J. Achten Innas BV, Nikkelstraat 15, NL 4823 AE Breda, The Netherlands
  • Zhao Fu Innas BV, Nikkelstraat 15, NL 4823 AE Breda, The Netherlands

Keywords:

hydraulic transformer, valve plate, pressure pulsation, cavitation

Abstract

The design of a hydraulic pump or motor with a variable displacement could be much simpler, if a rotating valve plate could be used to vary the displacement. An essential aspect of the rotating valve plate is however that the passage of the cylinder ports from one kidney to the other often occurs while the pistons are moving. Experiments have revealed that this leads to high pressure spikes and cavitation. Because of this it is an unwritten rule that in hydraulic pumps and motors the passage of the so-called valving lands has to take place in the top and bottom dead centres.

Against this rule there is a new hydraulic transformer developed (the Innas Hydraulic Transformer or IHT) in which the rotating valve plate is introduced again. Instead of varying the displacement the position of the valve plate now de-fines the pressure ratio between the load and the supply port. As will be shown this has a crucial effect on the valving land phenomena. Instead of increasing pressure pulsations and cavitation the rotating valve plate can now help to reduce these effects.

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Author Biographies

Peter A. J. Achten, Innas BV, Nikkelstraat 15, NL 4823 AE Breda, The Netherlands

Peter Achten Born in 1957 Graduated from Eindhoven Technical University in 1982 at the department of Mechanical Engineering. From 1982 till 1987 he worked at the Center for Energy Conservation and Clean Technology in Delft. He has been director of Innas BV since 1987. In 1996 he received a doctor’s degree at Eindhoven Technical University on the design of the free piston engine.

Zhao Fu, Innas BV, Nikkelstraat 15, NL 4823 AE Breda, The Netherlands

Fu Zhao Born in 1969 Majored in Mechanical Design from 1985 to 1989 and gained a bachelor’s degree. In the period of 1989-1992 she studied semi-active vehicle suspension and gained a master’s degree. A doctor’s degree was granted in 1995 on the research work on electro-rheological fluids and its application in vehicle suspension. Employed at Innas BV since 1996.

References

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Published

2000-03-01

How to Cite

Achten, P. A. J., & Fu, Z. (2000). VALVING LAND PHENOMENA OF THE INNAS HYDRAULIC TRANSFORMER. International Journal of Fluid Power, 1(1), 39–47. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/656

Issue

2000: Vol 01 Iss 1

Section

Original Article

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