Abstract

The parasitic drag losses incurred by wet clutches, used in transmission systems, can significantly affect vehicular powertrain efficiency. This paper presents a novel implicit solution for hydrodynamic parasitic drag losses of disengaged clutches. These are generated by conjunctional friction, taking into account lubricant film separation during codirectional and counter-directional disk pair rotations. Lubricant film rupture is considered through application of incipient reverse flow boundary condition, which is representative of lubricant film separation. The results point to the operating conditions at which significant power losses occur. In particular, the time efficient model is able to represent the small losses incurred during codirectional rotation of disk pairs.

References

References
1.
Berger
,
E. J.
,
Sadeghi
,
F.
, and
Krousgrill
,
C. M.
,
1997
, “
Torque Transmission Characteristics of Automatic Transmission Wet Clutches: Experimental Results and Numerical Comparison
,”
Tribol. Trans.
,
40
(
4
), pp.
539
548
.10.1080/10402009708983691
2.
Davis
,
C. L.
,
Sadeghi
,
F.
, and
Krousgrill
,
C. M.
,
2000
, “
A Simplified Approach to Modeling Thermal Effects in Wet Clutch Engagement: Analytical and Experimental Comparison
,”
ASME J. Tribol.
,
122
(
1
), pp.
110
118
.10.1115/1.555370
3.
Walker
,
P. D.
,
Zhang
,
N.
,
Tamba
,
R.
, and
Fitzgerald
,
S.
,
2011
, “
Simulations of Drag Torque Affecting Synchronisers in a Dual Clutch Transmission
,”
Jpn. J. Ind. Appl. Math.
,
28
(
1
), pp.
119
140
.10.1007/s13160-011-0030-4
4.
Marklund
,
P.
,
2008
, “
Wet Clutch Tribological Performance Optimization Methods
,” Ph.D. dissertation, Luleå Tekniska Universitet, Luleå, Sweden.
5.
Pahlovy
,
S.
,
Mahmud
,
S. F.
,
Kubota
,
M.
,
Ogawa
,
M.
, and
Takakura
,
N.
,
2014
, “
Multiphase Drag Modeling for Prediction of the Drag Torque Characteristics in Disengaged Wet Clutches
,”
SAE Int. J. Commer. Veh.
,
7
(
2
), pp.
441
447
.10.4271/2014-01-2333
6.
Iqbal
,
S.
,
Al-Bender
,
F.
,
Pluymers
,
B.
, and
Desmet
,
W.
,
2013
, “
Model for Predicting Drag Torque in Open Multi-Disks Wet Clutches
,”
ASME J. Fluids Eng.
,
136
(
2
), p.
021103
.10.1115/1.4025650
7.
Yuan
,
Y.
,
Liu
,
E. A.
,
Hill
,
J.
, and
Zou
,
Q.
,
2007
, “
An Improved Hydrodynamic Model for Open Wet Transmission Clutches
,”
ASME J. Fluids Eng.
,
129
(
3
), pp.
333
337
.10.1115/1.2427088
8.
Morris
,
N.
,
Davies
,
J.
,
Leighton
,
M.
,
King
,
P. D.
, and
Rahnejat
,
H.
,
2019
, “
Oil Film Separation and Drag Torque in Disengaged Wet Brakes
,”
Inst. Mech. Eng., Part D
, epub.10.1177/0954407019844358
9.
Swift
,
H. W.
,
1932
, “
The Stability of Lubricating Films in Journal Bearings
,”
J. Inst. Civ. Eng.
,
233
(
1
), pp.
267
288
.10.1680/imotp.1932.13239
10.
Stieber
,
W.
,
1933
,
Dus Schwimmlager
,
Verein Deutscher Ingenieurre
,
Berlin
.
11.
Mahmud
,
S. F.
,
Pahlovy
,
S. A.
,
Kubota
,
M.
,
Ogawa
,
M.
, and
Takakura
,
N.
,
2015
, “
Multi-Phase Simulation for Predicting Better Groove Pattern of the Clutch Disk for Low Drag Torque
,”
SAE
Paper No. 2015-01-1977. 10.4271/2015-01-1977
12.
Jammulamadaka
,
A. K.
, and
Gaokar
,
P.
,
2011
, “
Spin Loss Computation for Open Clutch Using CFD
,”
SAE Int. J. Engines
,
4
(
1
), pp.
1536
1544
.10.4271/2011-01-1238
13.
Yuan
,
Y.
,
Attibele
,
P.
, and
Dong
,
Y.
,
2003
, “
CFD Simulation of the Flows Within Disengaged Wet Clutches of an Automatic Transmission
,”
SAE
Paper No. 2003-01-0320. 10.4271/2003-01-0320
14.
Yuan
,
S.
,
Guo
,
K.
,
Hu
,
J.
, and
Peng
,
Z.
,
2010
, “
Study on Aeration for Disengaged Wet Clutches Using a Two-Phase Flow Model
,”
ASME J. Fluids Eng.
,
132
(
11
), p.
111304
.10.1115/1.4002874
15.
Zweig
,
J. E.
, and
Sneck
,
H. J.
,
1976
, “
Two-Fluid Flow Between Rotating Annular Disks
,”
ASME J. Lubr. Technol.
,
98
(
2
), pp.
214
222
.10.1115/1.3452798
16.
Jibin
,
H.
,
Zengxiong
,
P.
, and
Chao
,
W.
,
2012
, “
Experimental Research on Drag Torque for Single-Plate Wet Clutch
,”
ASME J. Tribol.
,
134
(
1
), p.
014502
.10.1115/1.4005528
17.
Aphale
,
C. R.
,
Schultz
,
W. W.
, and
Ceccio
,
S. L.
,
2011
, “
Aeration in Lubrication With Application to Drag Torque Reduction
,”
ASME J. Tribol.
,
133
(
3
), p.
031701
.10.1115/1.4004303
18.
Coombs
,
J. A.
, and
Dowson
,
D.
,
1964
, “
Paper 12: An Experimental Investigation of the Effects of Lubricant Inertia in a Hydrostatic Thrust Bearing
,”
Proc. Inst. Mech. Eng.
,
179
(
10
), pp.
96
114
.10.1243/PIME_CONF_1964_179_270_02
19.
Brunetière
,
N.
,
Tournerie
,
B.
, and
Fre
,
J.
,
2002
, “
Influence of Fluid Flow Regime on Performances of Non-Contacting Liquid Face Seals
,”
ASME J. Tribol.
,
124
(
3
), pp.
515
523
.10.1115/1.1456453
20.
Hou
,
S.
,
Hu
,
J.
, and
Peng
,
Z.
,
2017
, “
Experimental Investigation on Unstable Vibration Characteristics of Plates and Drag Torque in Open Multiplate Wet Clutch at High Circumferential Speed
,”
ASME J. Fluids Eng.
,
139
(
11
), p.
111103
.10.1115/1.4037055
21.
Birkhoff
,
G.
, and
Hays
,
D. F.
,
1963
, “
Free Boundaries in Partial Lubrication
,”
Stud. Appl. Math.
,
42
(
1–4
), pp.
126
138
.10.1002/sapm1963421126
22.
Dowson
,
D.
,
1961
, “
Inertia Effects in Hydrostatic Thrust Bearings
,”
ASME J. Basic Eng.
,
83
(
2
), pp.
227
234
.10.1115/1.3658931
23.
Coyne
,
J. C.
, and
Elrod
,
H. G.
,
1970
, “
Conditions for the Rupture of a Lubricating Film—Part I: Theoretical Model
,”
ASME J. Lubr. Technol.
,
92
(
3
), pp.
451
456
.10.1115/1.3451441
24.
Coyne
,
J. C.
, and
Elrod
,
H. G.
,
1971
, “
Conditions for the Rupture of a Lubricating Film—Part II: New Boundary Conditions for Reynolds Equation
,”
ASME J. Lubr. Technol.
,
93
(
1
), pp.
156
167
.10.1115/1.3451506
25.
Hopkins
,
M. R.
,
1957
, “
Viscous Flow Between Rotating Cylinders and a Sheet Moving Between Them
,”
Br. J. Appl. Phys.
,
8
(
11
), pp.
442
444
.10.1088/0508-3443/8/11/303
26.
Dowson
,
D.
, and
Taylor
,
C. M.
,
1979
, “
Cavitation in Bearings
,”
Annu. Rev. Fluid Mech.
,
11
(
1
), pp.
35
65
.10.1146/annurev.fl.11.010179.000343
27.
Neupert
,
T.
, and
Bartel
,
D.
,
2019
, “
High-Resolution 3D CFD Multiphase Simulation of the Flow and the Drag Torque of Wet Clutch Discs Considering Free Surfaces
,”
Tribol. Int.
,
129
, pp.
283
296
.10.1016/j.triboint.2018.08.031
28.
Pahlovy
,
S. A.
,
Mahmud
,
S. F.
,
Kubota
,
M.
,
Ogawa
,
M.
, and
Takakura
,
N.
,
2016
, “
New Development of a Gas Cavitation Model for Evaluation of Drag Torque Characteristics in Disengaged Wet Clutches
,”
SAE Int. J. Engines
,
9
(
3
), pp.
1910
1915
.10.4271/2016-01-1137
29.
Aphale
,
C. R.
,
Cho
,
J.
,
Schultz
,
W. W.
,
Ceccio
,
S. L.
,
Yoshioka
,
T.
, and
Hiraki
,
H.
,
2006
, “
Modeling and Parametric Study of Torque in Open Clutch Plates
,”
ASME J. Tribol.
,
128
(
2
), pp.
422
430
.10.1115/1.2162553
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