This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Effect of Journal Surface Finish on Journal Bearing Load Capacity - A Radiometric Method
Technical Paper
1999-01-0288
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Radiometric wear measurement techniques have been applied to determine the effect of journal surface finish on journal bearing load capacity. Bearing load capacity was measured by using a test machine that applies a linearly increasing unidirectional load to a radioactive test bearing. The onset of bearing wear provides a direct measurement of fluid-film breakdown, which is used to define hydrodynamic bearing load capacity. By use of a journal that can be located at two different positions on the shaft, the relative difference in load capacity between two journal surface finishes can be measured without the need to disturb the geometry of the bearing. The effect of journal surface finish on bearing load capacity was thereby quantified. In this study, nodular iron journals were prepared to have test surfaces with different levels of surface roughness. Results of the radiometric measurements indicate that roughness average, Ra, and core roughness depth, Rk, are the best predictors of load capacity. An increase in the value of either parameter results in a proportional decrease in load capacity. These studies also show that when the journal is ground opposite to the direction of shaft rotation, load capacity decreases by 33%. This work has demonstrated the capability of the radiometric wear technique to quantify the relative performance of journal surfaces and journal geometry.
Recommended Content
Authors
Citation
Schneider, E. and Blossfeld, D., "The Effect of Journal Surface Finish on Journal Bearing Load Capacity -A Radiometric Method," SAE Technical Paper 1999-01-0288, 1999, https://doi.org/10.4271/1999-01-0288.Also In
References
- DeHart A. O. Rosenberg R. C. Hill R. F. Schneider E. W. “A Radiometric Test to Determine the Lubricant Effect on Journal Bearing Load Capacity,” SAE Paper 800361 1980
- Schneider E. W. Rosenberg R. C. “The Effect of Fuel-Saving Engine Oils on Journal Bearing Load Capacity -- A Radiometric Evaluation,” SAE Trans. 91 3730 1983
- Schneider E. W. Blossfeld D. H. DeHart A. O. “The Effect of Coolant Contamination in Lubricating Oil on Journal Bearing Load Capacity -- A Radiometric Evaluation,” Lubrication Engineering 43 800 1987
- Whitney, W. J. Jr. Schwab B. E. “Crankshaft Surfaces: Finishing Methods, Surface Characterization and their Influence on Wear,” Wear 108 345 356 1986
- Judge N. R. “Crankshafts Finished and Sized,” American Machinist 139 6 32 36 June 1995
- Crooks C. S. Parker D. D. “The Importance of Crankshaft Surface Texture to Bearing System Reliability,” SAE Paper 960986 1996
- Dagnall H. Surface Texture for the 90's Rank Taylor Hobson Inc. Desplaines, IL 1988