Technical Note: Comparison of the dynamic behaviour of two misaligned crankshaft bearings

Abstract

A comparison of the dynamic performance characteristics of two misaligned crankshaft bearings belonging to a four-stroke petrol engine is carried out in this paper. The misalignment considered varies in magnitude during the running cycle. Under the dynamic conditions, the performance characteristics such as minimum film thickness, shaft centre orbit, friction torque and flowrate are obtained by using the mobility method of Booker. The main results obtained show that the presence of even a small skew of the main journal axis can cause metal-to-metal contact at one of the bearing edges.

Keywords

crankshaft bearings petrol engine mobility method hydrodynamic lubrication

Get full access to this article

View all access options for this article.

References

McKee

S. A.

McKee

J. R.

Pressure distribution in the oil film of journal bearings. Trans. ASME, 1932, 54, 149–165.

Walther

R. A.

Sassenfeld

Pressure distribution and load in a 360° bearing with an inclined shaft: outline of procedure with an explanatory example. Report 13, Department of Science and Industrial Research, 1950.

Dubois

G. B.

Ocvirk

F. W.

Wehe

R. L.

Experimental investigations of misaligned plain bearings. NACA, technical note 3352, 1953.

Goenka

P. K.

Dynamically loaded journal bearings: Finite element method analysis. Trans. ASME, J. Lubric. Technol., October 1984, 106, 429–439.

Singh

D. V.

Sinhasan

Performance characteristics of an ungrooved big-end bearing with misalignment. Preprint 88-AM-7C-2, STLE, 1988.

Maspeyrot

Fr?ne

Shape defects and misalignment effects in connecting-rod bearings. In Proceedings of the 15th Leeds-Lyon Symposium on Tribology, September 1988.

Booker

J. F.

Dynamically loaded journal bearings: Numerical application of the mobility method. Trans. ASME, J. Lubric. Technol., January 1971, 93, 168–176.

Maspeyrot

Comportement dynamique des paliers de vilebrequin. Thèse de docteur, l'Universitè de Poitiers, France, 1989.

Nicolas

Paliers hydrodynamiques soumis à un torseur de forces quelconques. Thèse de docteur ingénieur, Université Claude Bernard-Lyon, France, December 1972.

10.

Safar

Z. S.

El-Kotb

M. M.

Mokhtar

D. M.

Analysis of misaligned journal bearings operating in turbulent regime. J. Tribology, 1989, 111, 215–219.

11.

Lahmar

Modélisation du comportement élasto-hydrodynamique des rev?tements de surface dans les paliers hydrodynamiques. Thèse de docteur, l'Universitè de Poitiers, France, 16 December 1991.