Effect of Oil Rheology on Journal Bearing Performance: Part 2 - Oil Film Thickness in the Big-End Bearing of an Operating Engine 871272
The instrumentation of the big-end bearing of a 2.8 litre V-6 gasoline engine to measure bearing oil film thickness during engine operation is described. The electrically insulated bearing and the journal form a capacitor with the oil film as the dielectric. Synchronous measurement of the capacitance enables the determination of the minimum oil film thickness, hm, as a function of crankangle. The minimum value of hmfor a complete 720° crankshaft rotation can be measured to a precision of about 5%; it is little affected by chemistry of the engine oil performance package or by engine torque but decreases significantly with increasing oil temperature and increasing crankshaft speed.
Citation: Bates, T., Benwell, S., and Evans, P., "Effect of Oil Rheology on Journal Bearing Performance: Part 2 - Oil Film Thickness in the Big-End Bearing of an Operating Engine," SAE Technical Paper 871272, 1987, https://doi.org/10.4271/871272. Download Citation
Terence W. Bates, Stephen Benwell, Peter G. Evans
Shell Research Limited, Thornton Research Centre
4th International Pacific Conference on Automotive Engineering
Proceedings of the Fourth International Pacific Conference on Automotive Engineering-P-212