Experimental testing of a variable displacement pump/motor that uses a hydro-mechanically timed digital valving mechanism to achieve partial-stroke piston pressurization (PSPP)

Alissa Montzka, Nathan Epstein, Michael Rannow, Thomas R. Chase, Perry Y. Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

This work describes an efficient means to adjust the power level of an axial piston hydraulic pump/motor. Conventionally, the displacement of a piston pump is varied by changing the stroke length of each piston. Since the losses do not decrease proportionally to the displacement, the efficiency is low at low displacements. Here, with partial-stroke piston pressurization (PSPP), displacement is varied by changing the portion of the piston stroke over which the piston is subjected to high pressure. Since leakage and friction losses drop as the displacement is decreased, higher efficiency is achieved at low displacements with PSPP. While other systems have implemented PSPP with electric or cam-actuated valves, the pump described in this paper is unique in implementing PSPP by way of a simple, robust hydromechanical valve system. Experimental testing of a prototype PSPP pump/motor shows that the full load efficiency is maintained even at low displacements.

Original languageEnglish (US)
Title of host publicationASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791859339
DOIs
StatePublished - 2020
EventASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019 - Longboat Key, United States
Duration: Oct 7 2019Oct 9 2019

Publication series

NameASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019

Conference

ConferenceASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019
Country/TerritoryUnited States
CityLongboat Key
Period10/7/1910/9/19

Bibliographical note

Funding Information:
This material is based upon work supported by the National Science Foundation under Grant #PFI-1700747 and through the Center for Compact and Efficient and Fluid Power (CCEFP) under Grant #EEC-0540834.

Publisher Copyright:
Copyright © 2019 ASME

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