liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
NOVEL LINEAR HYDRAULIC ACTUATOR
Saab Aeronautics, Linköping, Sweden. (Hydraulik)
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
2015 (English)In: 2015 Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control (FPMC2015), ASME Press, 2015Conference paper, Published paper (Refereed)
Abstract [en]

In the area of linear motion, infinite stroke only is provided by electric actuators today, until now there has been no hydraulic alternative. The novel linear hydraulic actuator consists of two double acting cylinders with a common piston rod. The working principle of this actuator for short movements is that at least one piston is connected to the piston rod and the actuator works like an ordinary hydraulic double acting cylinder.

For longer movements one of the pistons is connected alternatively to the piston rod providing the drive. In this way the two pistons are moving the piston rod alternatingly in a kind of rope climbing motion. The critical element is the clamping mechanism which is an already known machine element but used in this new application.

Advantages of this concept are as follows: The actuator is compact. Very long strokes and piston rods are allowed without side effects of common cylinders. This property is the origin of the name “infinite cylinder”. The cylinder has small chamber volumes and so high hydraulic stiffness and low capacitance. It has also potentially no external leakage.

The cylinder can provide twice the rated force for short strokes. Applications for this feature are the plate opening stroke of injection molding machines, or presses with low work to travel stroke ratio, like a press brake.

The paper includes a detailed description of the design and the working principle. One critical component is the clamping mechanism which temporarily connects the pistons to the piston rod. The clamping mechanism together with the piston represents a new kind of machine element in the mechanical engineering field. Here the focus will be on the function and the control strategy. With simulation the proposed control strategy and function will be presented and the performance analyzed. The simulation model is backed up by first results from experiments on the early prototype.

The experiments carried out so far on the hydraulic clamping mechanism, which is the critical component in the system show very promising results that the required function can be achieved. Furthermore, the function of the whole cylinder has been simulated with good result. For the full paper results from a functioning prototype is also to be expected.

Place, publisher, year, edition, pages
ASME Press, 2015.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:liu:diva-142565DOI: 10.1115/FPMC2015-9604ISBN: 978-0-7918-5723-6 (electronic)OAI: oai:DiVA.org:liu-142565DiVA: diva2:1153828
Conference
ASME/BATH 2015 Symposium on Fluid Power & Motion Control FPCM2015 October 12-14 2015, Chicago, Illinois, United States
Funder
Swedish Energy Agency, 39811-1
Available from: 2017-10-31 Created: 2017-10-31 Last updated: 2017-11-29

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Magnus, LandbergMartin, Hochwallner
By organisation
Fluid and Mechatronic SystemsFaculty of Science & Engineering
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 2 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf