A steady-state Reynolds type equation with inertia consideration is solved numerically for a coolant film entrapped between a grooved separator-friction plate pair of a multidisk wet clutch arrangement at a particular instant of the disengaged state. Straight grooves with rounded, trapezoidal, and V-section at different angular orientations are considered and the effects of their geometry and orientation on viscous torque, flow rate, and axial force are presented. Among the profiles studied, the rounded one is found to be better. Grooves inclined with the flow direction cause less viscous torque and, hence, less power loss. The choice of orientation angle, β, to give a maximum outflow or inflow may be helpful for cooling by better convection. For wider radial span and large number of grooves, the minimum operating gap ratio is suggested to be around 2.0. Inertia effects may shift the optimum orientation angle by as much as 10 deg, even at a moderate value of gap Reynolds number.

1.
Basu
P.
,
1992
, “
Analysis of a Radial Groove Gas Face Seal
,”
STLE Tribology Transactions
, Vol.
35
, No.
1
, pp.
11
20
.
2.
Berger
E. J.
,
Sadeghi
F.
, and
Krousgrill
C. M.
,
1996
, “
Finite Element Modeling of Engagement of Rough and Grooved Wet Clutches
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
118
, pp.
137
146
.
3.
Berger
E. J.
,
Sadeghi
F.
, and
Krousgrill
C. M.
,
1997
, “
Analytical and Numerical Modeling of Engagement of Rough, Permeable, Grooved Wet Clutches
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
119
, pp.
143
148
.
4.
Constantinescu
V. N.
, and
Galetuse
S.
,
1992
, “
On Extending the Narrow Spiral-Groove Theory to Configurations of Interest in Seals
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, pp.
563
566
.
5.
Hsing
F. C.
,
1972
, “
Formulation of a Generalized Narrow Groove Theory for Spiral Grooved Viscous Pumps
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
94
, No.
1
, pp.
81
85
.
6.
James
D. D.
, and
Potter
A. F.
,
1967
, “
Numerical Analysis of the Gas-Lubricated Spiral-Groove Thrust Bearing-Compressors
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
89
, pp.
439
444
.
7.
Lipschitz
A.
,
Basu
P.
, and
Johnson
R. P.
,
1991
, “
A Bi-Directional Gas Thrust Bearing
,”
STLE Tribology Transactions
, Vol.
34
, No.
1
, pp.
9
16
.
8.
Malanoski
S. B.
, and
Pan
C. H. T.
,
1965
, “
The Static and Dynamic Characteristics of the Spiral-Grooved Thrust Bearing
,”
ASME Journal of Basic Engineering
, Vol.
87
, pp.
547
558
.
9.
Muijderman
E. A.
,
1967
, “
Analysis and Design of Spiral-Groove Bearings
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
89
, pp.
291
306
.
10.
Ohkawa, S., Kawasaki, N., Kuse, T., Shibata, A., and Mori, K., 1995, “Wet Clutches and Wet Brakes for Construction Equipment,” Proc. ITC Yokohama ’95 Satellite Forum Tribology of Wet Friction Materials, Nov. 3rd.
11.
Sato
Y.
,
Ono
K.
, and
Iwama
A.
,
1990
, “
The Optimum Groove Geometry for Spiral Groove Viscous Pumps
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
112
, pp.
409
414
.
12.
Vohr
J. H.
, and
Chow
C. Y.
,
1965
, “
Characteristics of Herringbone-Grooved, Gas-Lubricated Journal Bearings
,”
ASME Journal of Basic Engineering
, Vol.
87
, pp.
568
578
.
This content is only available via PDF.
You do not currently have access to this content.