Design and testing of an adjustable linkage for a variable displacement pump

Shawn R Wilhelm, James D Van De Ven

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A variable displacement hydraulic pump/motor with high efficiency at all operating conditions,including low displacement, is beneficial to multiple applications. Two major energy loss terms in conventional pumps are the friction and lubrication leakage in the kinematic joints. This paper presents the synthesis, analysis, and experimental validation of a variable displacement sixbar crank-rocker-slider mechanism that uses low friction pin joints instead of planar joints as seen in conventional variable pump/motor architectures. The novel linkage reaches true zero displacement with a constant top dead center position, further minimizing compressibility energy losses. The synthesis technique develops the range of motion for the base fourbar crank-rocker and creates a method of synthesizing the output slider dyad. It is shown that the mechanism can be optimized for minimum footprint and maximum stroke with a minimum base fourbar transmission angle of 30 deg and a resultant slider transmission angle of 52 deg. The synthesized linkage has a dimensionless stroke of 2.1 crank lengths with a variable timing ratio and velocity and acceleration profiles in the same order of magnitude as a comparable crank-slider mechanism. The kinematic and kinetic results from an experimental prototype linkage agree well with the model predictions.

Original languageEnglish (US)
Article number041008
JournalJournal of Mechanisms and Robotics
Volume5
Issue number4
DOIs
StatePublished - Sep 11 2013

Fingerprint

Pumps
Energy dissipation
Kinematics
Testing
Friction
Compressibility
Lubrication
Hydraulics
Kinetics

Cite this

Design and testing of an adjustable linkage for a variable displacement pump. / Wilhelm, Shawn R; Van De Ven, James D.

In: Journal of Mechanisms and Robotics, Vol. 5, No. 4, 041008, 11.09.2013.

Research output: Contribution to journalArticle

@article{39a9d455907d45419c033f9bbecab549,
title = "Design and testing of an adjustable linkage for a variable displacement pump",
abstract = "A variable displacement hydraulic pump/motor with high efficiency at all operating conditions,including low displacement, is beneficial to multiple applications. Two major energy loss terms in conventional pumps are the friction and lubrication leakage in the kinematic joints. This paper presents the synthesis, analysis, and experimental validation of a variable displacement sixbar crank-rocker-slider mechanism that uses low friction pin joints instead of planar joints as seen in conventional variable pump/motor architectures. The novel linkage reaches true zero displacement with a constant top dead center position, further minimizing compressibility energy losses. The synthesis technique develops the range of motion for the base fourbar crank-rocker and creates a method of synthesizing the output slider dyad. It is shown that the mechanism can be optimized for minimum footprint and maximum stroke with a minimum base fourbar transmission angle of 30 deg and a resultant slider transmission angle of 52 deg. The synthesized linkage has a dimensionless stroke of 2.1 crank lengths with a variable timing ratio and velocity and acceleration profiles in the same order of magnitude as a comparable crank-slider mechanism. The kinematic and kinetic results from an experimental prototype linkage agree well with the model predictions.",
author = "Wilhelm, {Shawn R} and {Van De Ven}, {James D}",
year = "2013",
month = "9",
day = "11",
doi = "10.1115/1.4025122",
language = "English (US)",
volume = "5",
journal = "Journal of Mechanisms and Robotics",
issn = "1942-4302",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "4",

}

TY - JOUR

T1 - Design and testing of an adjustable linkage for a variable displacement pump

AU - Wilhelm, Shawn R

AU - Van De Ven, James D

PY - 2013/9/11

Y1 - 2013/9/11

N2 - A variable displacement hydraulic pump/motor with high efficiency at all operating conditions,including low displacement, is beneficial to multiple applications. Two major energy loss terms in conventional pumps are the friction and lubrication leakage in the kinematic joints. This paper presents the synthesis, analysis, and experimental validation of a variable displacement sixbar crank-rocker-slider mechanism that uses low friction pin joints instead of planar joints as seen in conventional variable pump/motor architectures. The novel linkage reaches true zero displacement with a constant top dead center position, further minimizing compressibility energy losses. The synthesis technique develops the range of motion for the base fourbar crank-rocker and creates a method of synthesizing the output slider dyad. It is shown that the mechanism can be optimized for minimum footprint and maximum stroke with a minimum base fourbar transmission angle of 30 deg and a resultant slider transmission angle of 52 deg. The synthesized linkage has a dimensionless stroke of 2.1 crank lengths with a variable timing ratio and velocity and acceleration profiles in the same order of magnitude as a comparable crank-slider mechanism. The kinematic and kinetic results from an experimental prototype linkage agree well with the model predictions.

AB - A variable displacement hydraulic pump/motor with high efficiency at all operating conditions,including low displacement, is beneficial to multiple applications. Two major energy loss terms in conventional pumps are the friction and lubrication leakage in the kinematic joints. This paper presents the synthesis, analysis, and experimental validation of a variable displacement sixbar crank-rocker-slider mechanism that uses low friction pin joints instead of planar joints as seen in conventional variable pump/motor architectures. The novel linkage reaches true zero displacement with a constant top dead center position, further minimizing compressibility energy losses. The synthesis technique develops the range of motion for the base fourbar crank-rocker and creates a method of synthesizing the output slider dyad. It is shown that the mechanism can be optimized for minimum footprint and maximum stroke with a minimum base fourbar transmission angle of 30 deg and a resultant slider transmission angle of 52 deg. The synthesized linkage has a dimensionless stroke of 2.1 crank lengths with a variable timing ratio and velocity and acceleration profiles in the same order of magnitude as a comparable crank-slider mechanism. The kinematic and kinetic results from an experimental prototype linkage agree well with the model predictions.

UR - http://www.scopus.com/inward/record.url?scp=84890821417&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84890821417&partnerID=8YFLogxK

U2 - 10.1115/1.4025122

DO - 10.1115/1.4025122

M3 - Article

AN - SCOPUS:84890821417

VL - 5

JO - Journal of Mechanisms and Robotics

JF - Journal of Mechanisms and Robotics

SN - 1942-4302

IS - 4

M1 - 041008

ER -