Variable displacement pumps are a key component to a variety of mobile and industrial hydraulic systems, yet the efficiency of existing pump architectures is poor at low displacement. As a solution to this issue, a new pump architecture is proposed that eliminates the planar hydrodynamic joints of a conventional architecture with rolling-element pin joints in an adjustable linkage. This new architecture uses an adjustable six-bar linkage that reaches true zero displacement and has the same top-dead-center (TDC) position regardless of displacement. In this work, the linkage kinematics and dynamics are discussed, an energy loss model is developed and used to drive design decisions of a first generation prototype, and experimental results are presented to validate the model. It is shown that this linkage-based, variable, positive displacement architecture shows promise as a highly efficient alternative to existing pump architectures across a wide range of displacements.
Adjustable Linkage Pump: Efficiency Modeling and Experimental Validation
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Department of Mechanical Engineering,
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Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANISMS AND ROBOTICS. Manuscript received February 3, 2014; final manuscript received July 30, 2014; published online December 4, 2014. Assoc. Editor: Philippe Wenger.
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Wilhelm, S., and Van de Ven, J. (August 1, 2015). "Adjustable Linkage Pump: Efficiency Modeling and Experimental Validation." ASME. J. Mechanisms Robotics. August 2015; 7(3): 031013. https://doi.org/10.1115/1.4028293
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