A series of formulas are presented which enable accurate predictions of churning losses for one pinion characteristic of automotive transmission geometry. The results are based on dimensional analysis and have been experimentally validated over a wide range of speeds, gear geometries, lubricants, and immersion depths. The case of a pinion-gear pair in mesh has been considered, and it has been proved that, depending on the sense of rotation, the superposition of the individual losses of the pinion and of the gear leads to erroneous figures. A new formula devoted to a pinion and gear rotating anticlockwise has been derived and validated by comparison with experimental evidence.

1.
Daily
,
J. W.
, and
Nece
,
R. E.
, 1960. “
Chamber Dimension Effects on Induced Flow and Frictional Resistance of Enclosed Rotating Disk
,”
ASME J. Basic Eng.
0021-9223,
82
, pp.
217
232
.
2.
Mann
,
R. W.
, and
Marston
,
C. H.
, 1961, “
Friction Drag on Bladed Disks in Housings as a Function of Reynolds Number, Axial and Radial Clearance and Blade Aspect Ratio and Solidity
,”
ASME J. Basic Eng.
0021-9223,
83
(
4
), pp.
719
723
.
3.
Soo
,
S. L.
, and
Princeton
,
N. J.
, 1958, “
Laminar Flow Over an Enclosed Rotating Disk
,”
Trans. ASME
0097-6822,
80
, pp.
287
296
.
4.
Blok
,
H.
, 1937, “
Les Températures de Surface Dans les Conditions de Graissage Sous Extrême Pression
,”
Proc. 2nd Congrès mondial du Pétrole
, Paris, pp.
471
486
.
5.
Niemann
,
G.
, and
Lechner
,
G.
, 1965, “
The Measurement of Surface Temperature on Gear Teeth
,”
ASME J. Basic Eng.
0021-9223,
11
, pp.
641
651
.
6.
Terekhov
,
A. S.
, 1975, “
Hydraulic Losses in Gearboxes With Oil Immersion
,”
Vestnik Mashinostroeniya
,
55
(
5
), pp.
13
17
.
7.
Lauster
,
E.
, and
Boos
,
M.
, 1983, “
Zum Wärmehaushalt mechanischer Schaltgetriebe für Nutzfahrzeuge
,”
VDI-Ber.
0083-5560,
488
, pp.
45
55
.
8.
Boness
,
R. J.
, 1989, “
Churning Losses of Discs and Gears Running Partially Submerged in Oil
,”
Proc. ASME Int. Power Trans. Gearing Conf.
, Chicago, Vol.
1
, pp.
355
359
.
9.
Diab
,
Y.
,
Ville
,
F.
,
Velex
,
P.
, and
Changenet
,
C.
, 2004, “
Windage Losses in High-Speed Gears. Preliminary Experimental and Theoretical Results
,”
ASME J. Mech. Des.
1050-0472,
126
(
5
), pp.
903
908
.
10.
Candel
,
S.
, 1995,
Mécanique des Fluides—Cours
, 2nd ed.,
Dunod
, Paris, pp.
151
183
.
11.
Changenet
,
C.
,
Oviedo-Marlot
,
X.
, and
Velex
,
P.
, 2006, “
Power Loss Predictions in Geared Transmissions Using Thermal Networks—Applications to a Six-Speed Manual Gearbox
,”
ASME J. Mech. Des.
1050-0472,
128
(
3
), pp.
618
625
.
12.
Changenet
,
C.
, 2006, “
Modélisation du Comportement Thermique des Transmissions par Engrenages
,” PhD. thesis, Institut National des Sciences Appliquées de Lyon, pp.
70
75
.
13.
Diab
,
Y.
,
Ville
,
F.
,
Houjoh
,
H.
,
Sainsot
,
P.
, and
Velex
,
P.
, 2005, “
Experimental and Numerical Investigations on the Air Pumping Phenomenon in High Speed Spur and Helical Gears
,”
Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci.
0954-4062,
219
(
8
), pp.
785
800
.
You do not currently have access to this content.