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, Volume 10, Issue 1, pp 20–25 | Cite as

Speed Variable Pump Drives for Mobile Applications Using Superimposed Gears

  • Lennart Roos
  • Ludger Frerichs
Cover Story Transmissions

Speed variable pump drives are propulsion systems of hydrostatic pumps that are able to adjust their rotary speed properly in order to change the pump’s flow rate. This leads to energetic and/or dynamic advantages in hydraulic systems using fixed or variable displacement pumps. At the TU Braunschweig, transmission concepts were tested for speed-variable pump drives, which are supposed to transfer the advantages estimated in stationary hydraulics to mobile applications.

Speed Variable Pump Drives

Since the mid-90ies there are research activities on speed variable pump drives for stationary applications in order to provide appropriate hydraulic power. These supply units consist of a frequency controlled electric motor (EM) and a corresponding fixed or variable displacement pump. The dynamics as well as the characteristics of losses were examined by [1, 2, 3, 4] in detail. Enhancement in efficiency and partly in dynamics are possible in considered working cycles. Speed variable operation...


Electric Motor Mobile Application Internal Combustion Engine Planetary Gear Ring Gear 
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Copyright information

© Springer Fachmedien Wiesbaden 2017

Authors and Affiliations

  • Lennart Roos
    • 1
  • Ludger Frerichs
    • 2
  1. 1.Institute of Mobile Machines and Commercial Vehicles, focusing on mobile hydraulicsTechnische Universität BraunschweigBraunschweigGermany
  2. 2.Institute of Mobile Machines and Commercial Vehicles and University ProfessorTechnische Universität BraunschweigBraunschweigGermany

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