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.

Issue Section:
Technical Brief
Keywords:
gears, automotive components, power transmission (mechanical)
Topics:
Gears, Lubricants, Rotation
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
.
Crossref
Search ADS
 
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
.
Crossref
Search ADS
 
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
.
Crossref
Search ADS
 
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
.
Crossref
Search ADS
 
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
.
Crossref
Search ADS
 
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 by American Society of Mechanical Engineers
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