Effect of Oil Aeration Rate on the Minimum Oil Film Thickness and Reliability of Engine Bearing 932785
In order to study the effect of the oil aeration rate on bearing reliability, the minimum oil film thicknesses(MOFT) were measured by the change of oil aeration rate using the total capacitance method(TCM), and at the same time, to study the appropriateness as an index of bearing reliability, crankshaft temperatures were measured. The minimum oil film thicknesses were measured at each of five main bearings and No.1 connecting rod bearing. A scissor type linkage system was employed to measure the minimum oil film thickness of connecting rod bearing. Special techniques were devised to inject air into the oil, and to monitor the aeration rate by an on-line measurement system.
The measured aeration rates are proportional to the oil pressure drop. The change of the MOFTs are very slight up to a 30% aeration rate in the test engine. But if the oil aeration rate exceeded 30%, the minimum oil film thicknesses were changed. So, it was found that the oil aeration rate should have a fixed limit in order to maintain bearing reliability.
Citation: Choi, J., Min, B., and Han, D., "Effect of Oil Aeration Rate on the Minimum Oil Film Thickness and Reliability of Engine Bearing," SAE Technical Paper 932785, 1993, https://doi.org/10.4271/932785. Download Citation
Author(s):
Jae-Kwon Choi, Byeong-Soon Min, Dong-Chul Han
Affiliated:
Hyundai Motor Co. Research Institute
Pages: 17
Event:
International Fuels & Lubricants Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Tribological Insights and Performance Characteristics of Modern Engine Lubricants-SP-0996
Related Topics:
Connecting rods
Bearings
Crankshafts
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »
