This paper describes an investigation of the effects of fluid properties on hydraulic motor efficiency through experimentation and modeling. Synthetic ester, straight-grade mineral oil, and VI improved hydraulic fluids were evaluated. Fluid properties, including viscosity, shear-stability, density, and traction coefficients, were characterized. A model for relating motor mechanical efficiency to fluid properties was developed. This model combines the viscosity parameter of Stribeck with the surface adsorption model of Michaelis–Menten. The results revealed that fluids with a low traction coefficient improved the low-speed efficiency of motors by transitioning out of the boundary lubrication region at a lower Stribeck number.

References

References
1.
Love
,
L.
,
Lanke
,
E.
, and
Alles
,
P.
,
2012
, “
Estimating the Impact (Energy, Emissions and Economics) of the U.S. Fluid Power Industry
,” Oak Ridge National Laboratory, Oak Ridge, TN, Report No. ORNL/TM-2011/14.
2.
Deppen
,
T. O.
,
Alleyne
,
A. G.
,
Stelson
,
K. A.
, and
Meyer
,
J. J.
,
2012
, “
Optimal Energy Use in a Light Weight Hydraulic Hybrid Passenger Vehicle
,”
ASME. J. Dyn. Sys. Meas. Control.
,
134
(
4
), p.
041009
.
3.
Busquets
,
E.
, and
Ivantysynova
,
M.
,
2013
, “
Temperature Prediction of Displacement Controlled Multi-Actuator Machines
,”
Int. J. Fluid Power
,
14
(
1
), pp.
25
36
.
4.
Yang
,
H.
, and
Pan
,
M.
,
2015
, “
Engineering Research in Fluid Power: A Review
,”
J. Zheijiang Univ.-Sci. A (Appl. Phys. Eng.)
,
16
(
6
), pp.
427
442
.
5.
Herzog
,
S.
,
Zink
,
M.
, and
Michael
,
P.
,
2009
, “
Hydraulic Fluid Viscosity Selection for Improved Fuel Economy
,”
SAE J. Commer. Veh.
,
2
(
2
), pp.
61
65
.
6.
Neveu
,
C. D.
,
Cocks
,
R.
, and
Hutchinson
,
P.
,
2002
, “
A Study of the Dependence of the Volumetric Efficiency of a Vane Pump on Pressure and Viscosity
,”
3rd International Symposium on Fluids and Lubricants (ISFL-2002)
, New Delhi, India.
7.
Herzog
,
S. N.
,
Neveu
,
C. D.
, and
Placek
,
D. G.
,
2002
, “
Influence of Oil Viscosity and Pressure on the Internal Leakage of a Gear Pump
,”
57th Annual STLE Meeting
, Houston, TX.
8.
Manring
,
N. D.
,
2005
,
Hydraulic Control Systems
,
Wiley
,
New York
, Chap. 5.
9.
Stelson
,
K. A.
, and
Wang
,
F.
,
2010
, “
A Simple Model of Piston-Cylinder Gap Efficiency in Positive-Displacement Hydraulic Pumps and Motors
,”
Bath/ASME Symposium on Fluid Power and Motion Control
, Bath, UK, pp.
417
429
.
10.
Michael
,
P. W.
,
Garcia
,
J. M.
,
Bair
,
S. S.
,
Devlin
,
M. T.
, and
Martini
,
A.
,
2012
, “
Lubricant Chemistry and Rheology Effects on Hydraulic Motor Starting Efficiency
,”
Tribol. Trans.
,
55
(
5
), pp.
549
557
.
11.
Miller
,
M. K.
,
Khalid
,
H.
,
Michael
,
P.
,
Guevremont
,
J. M.
,
Garelick
,
K. J.
,
Pollard
,
G. W.
,
Whitworth
,
A. J.
, and
Devlin
,
M. T.
,
2014
, “
An Investigation of Hydraulic Motor Efficiency and Tribological Surface Properties
,”
Tribol. Trans.
,
57
(
4
) pp.
622
630
.
12.
Stribeck
,
R.
,
1901
, “
Kugellager für beliebige Belastungen Part 1
,”
Z. Ver. Dtsch. Ing.
,
45
(
3
) pp.
73
79
.
13.
Stribeck
,
R.
,
1901
, “
Kugellager für beliebige Belastungen Part 2
,”
Z. Ver. Dtsch. Ing.
,
45
(
4
), pp.
118
125
.
14.
Atkins
,
P. W.
,
1982
,
Physical Chemistry
,
2nd ed.
,
W.H Freeman and Company
,
San Francisco, CA
, pp.
1012
1029
.
15.
Langmuir
,
I.
,
1916
, “
Constitution of and Fundamental Properties of Solids and Liquids, Part 1, Solids
,”
J. Am. Chem. Soc.
,
38
(
11
) pp.
2267
2295
.
16.
Lara
,
J.
,
Blunt
,
T.
,
Kotvis
,
P. V.
,
Riga
,
A.
, and
Tysoe
,
W. T.
,
1998
, “
Surface Chemistry and Extreme-Pressure Lubricant Properties of Dimethyl Disulfide
,”
J. Phys. Chem. B
,
102
(
10
), pp.
1703
1709
.
17.
Wu
,
G.
,
Gao
,
F.
,
Kaltchev
,
M.
,
Gutow
,
J.
,
Mowlem
,
J. K.
,
Schramm
,
W. C.
,
Kotvis
,
P. V.
, and
Tysoe
,
W. T.
,
2002
, “
An Investigation of the Tribological Properties of Thin KCl Films on Iron in Ultrahigh Vacuum: Modeling the Extreme-Pressure Lubrication Interface
,”
Wear
,
252
(
7
), pp.
595
606
.
18.
Michaelis
,
L.
, and
Menten
,
M. L.
,
1913
, “
Die Kinetik der Invertinwirkung
,”
Biochem. Z.
,
49
, pp.
333
369
.
19.
Wilson
,
W. E.
,
1950
,
Positive Displacement Pumps and Fluid Motors
,
Pitman Publishing
,
New York
, Chaps. 6 and 7.
20.
ISO 4409
,
2007
,
Hydraulic Fluid Power—Positive Displacement Pumps, Motors and Integral Transmissions—Methods of Testing and Presenting Basic Steady State Performance
,
International Organization for Standardization
,
Geneva, Switzerland
.
21.
Parker Hannifin
,
2003
, LSHT Torqmotors and Nichols Motors, EU, Specifications Manual, No. HY13-1590-003/US.
22.
Poclain Hydraulics
,
2009
, MS02-MSE02 Hydraulic Motors, Specifications Manual.
23.
Sauer-Danfoss
,
2007
, Series 90 Axial Piston Motors, Specifications Manual, Technical Information. 520L0604.
You do not currently have access to this content.