The current experimental researches on the orbit of a journal center of a crankshaft bearing for an internal combustion engine were usually focused on the 2D movement locus of a crankshaft journal center in the cross section of the bearing. However, in the actual operation of an internal combustion engine, there exists the movement of a crankshaft journal along the bearing axis under the effect of various factors, such as the crankshaft deformation acted by load. Obviously the tribological performance of a crankshaft bearing is affected inevitably by the movement of the crankshaft journal along the bearing axis. In this paper, a four-stroke four-cylinder internal combustion engine was taken as the studying object, the 3D orbit (that includes the movement in the cross section of the bearing and the movement along the bearing axis) of the journal center of the crankshaft bearing for an internal combustion engine was measured under a number of operating conditions on the test bench of an internal combustion engine. The position of the journal in the crankshaft bearing was obtained by the measurement using eddy current gap sensors and the data post-process. The results show that there exists the movement of the crankshaft journal along the axial direction in the bearing for an internal combustion engine. The actual orbit of the journal center of the crankshaft bearing for an internal combustion engine is a 3D spatial curve. The orbit of the journal center of the crankshaft bearing in one operating cycle of an internal combustion engine is not a closed curve. There is relatively a large movement of the journal along the axial direction of the crankshaft bearing, and the numerical value of the movement is greater than the radial clearance of the bearing. The greater the rotational speed of the internal combustion engine, the larger the amount of axial movement of the journal. The periodic variation exists in the axial movement of the bearing journal in one operating cycle of the internal combustion engine at low engine speed, and the varying periodicity equals the number of engine cylinders. There is no obvious varying rule of the axial movement of the bearing journal in one operating cycle of the internal combustion engine at high engine speed.

References

References
1.
Hahn
,
H. W.
,
1957
, “
Dynamically Loaded Journal Bearings of Finite Length
,”
Conference on Lubrication and Wear Clut
, Instn Mech. Engrs, London, October 1957.
2.
Holland
,
J.
,
1959
, “
Beitrag Zur Erfassung der Schmierverhältniss in Verdrennungskraft maschinen
,” VDI-Forsch-Heft 475.
3.
Booker
,
J. F.
,
1971
, “
Dynamically-Loaded Journal Bearings: Numerical Application of the Mobility Method
,”
ASME J. Lub. Technol.
,
93
(1), pp.
168
174
.10.1115/1.3451507
4.
Paranjpe
,
R. S.
,
1995
, “
A Transient Thermohydrodynamic Analysis Including Mass Conserving Cavitation for Dynamically Loaded Journal Bearings
,”
ASME J. Tribol.
,
117
, pp.
369
378
.10.1115/1.2831261
5.
Ghanem
,
B.
,
2002
, “
Experimental Measurement of the Orbit of Journal Center in a Variable Loaded Bearing
,” Tribology & Lubrication Technology,
58
(12), pp. 29–31.
6.
Goodwin
,
M. J.
,
Groves
,
C.
,
Nikolajsen
,
J.
, and
Ogrodnik
,
P. J.
,
2000
, “
Experimental Measurement of Big-End Bearing Journal Orbits
,”
Proc. Inst. Mech. Eng. Part J
,
214
, pp.
219
228
.10.1243/1350650001543124
7.
Moreau
,
H.
,
Maspeyrot
,
P.
,
Chomat-Delalex
,
A. M.
,
Bonneau
,
D.
, and
Frene
,
J.
,
2002
, “
Dynamic Behaviour of Elastic Engine Main Bearings: Theory and Measurements
,”
Proc. Inst. Mech. Eng. Part J
,
216
, pp.
179
193
.10.1243/135065002760199943
8.
Moreau
,
H.
,
Maspeyrot
,
P.
,
Bonneau
,
D.
, and
Frène
,
J.
,
2002
, “
Comparison Between Experimental Film Thickness Measurements and Elastohydrodynamic Analysis in a Connecting-Rod Bearing
,”
Proc. Inst. Mech. Eng. Part J
,
216
, pp.
195
208
.10.1243/135065002760199952
9.
Dede
,
M.
, and
Holmes
,
R.
,
1984
, “
On Prediction and Experimental Assessment of Engine-Bearing Performance
,”
Tribol. Int.
,
17
, pp.
251
258
.10.1016/0301-679X(84)90115-4
10.
Suzuki
,
S.
,
Ozasa
,
T.
, and
Noda
,
T.
,
1998
,
Analysis of Con-Rod Big-End Bearing Lubrication on the Basis of Oil Supply Rate
, SAE Technical Paper No. 982439.
11.
Ozasa
,
T.
,
Yamamoto
,
M.
,
Suzuki
,
S.
, and
Nozawa
,
Y.
,
1995
, “
Elastohydrodynamic Lubrication Model of Connecting Rod Big End Bearings; Comparison With Experiments by Diesel Engine
,” SAE Technical Paper No. 952549.
12.
Tripp
,
H. A.
, and
Berker
,
A.
,
1988
, “
Oil Film Thickness Measurements in a Dynamically Loaded Journal Bearing—A Comparison of Measured and Calculated Minimum Oil Film Thickness With Newtonian Lubricating Oils
,” SAE Technical Paper No. 881664.
13.
Gui
,
C. L.
,
Sun
,
J.
,
He
,
Z. X.
, and
Li
,
Z.
,
2011
, “
A Dynamic Solution Method for Dynamically Loaded Bearing
,”
Tribol. Trans.
,
54
, pp.
384
393
.10.1080/10402004.2010.549604
You do not currently have access to this content.