This content is not included in your SAE MOBILUS subscription, or you are not logged in.
A Study of Oil Film Pressure Distribution on Connecting Rods Big Ends
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
Annotation ability available
As a result of demands for friction reduction and other performance requirements, there has been a trend towards reductions of bearing width and increases in load. Thus, high performance predictions are required to determine bearing feasibility limits. Measurement of oil film distribution is essential to judging bearing feasibility. Therefore, a thin film sensor was developed to enable highly accurate oil film pressure measurements in small bearings used in passenger vehicles. The sensor has a particularly smooth surface, making measurement possible with little effect on the lubrication conditions of sliding parts. For this research, the sensor was formed on the shaft so that oil film pressure distribution could be measured around the total periphery of the bearings. Three-dimensional oil film distribution measurements were conducted by the detection of multiple points on the sensor. Using this sensor, oil film pressure distribution was measured under different connecting rod big end rigidities, and the corresponding changes were analyzed. As a result, it was possible to verify that differences in rigidity caused differences in oil film pressure distribution. Oil film pressure shows one peak in the direction of the load in the case of a rigid connecting rod, whereas the pressure is dispersed and the direction of the peak does not match that of the load in the case of an elastic connecting rod. Elastohydrodynamic (EHD) calculations, which incorporate the rigidity of the bearings and housing, were performed using the same conditions as the measurements. Calculation results and measurement results corresponded well. In this way, the validity of both measurements and calculations was verified.
|Technical Paper||An Analytical Technique for Assessing Cylinder Liner Cavitation Erosion|
|Technical Paper||I. C. Engine Cam and Tappet Wear Experience|
|Technical Paper||Bearing Loads on Radial-Engine Crankshafts|
CitationSato, K., Makino, K., and Machida, K., "A Study of Oil Film Pressure Distribution on Connecting Rods Big Ends," SAE Technical Paper 2002-01-0296, 2002, https://doi.org/10.4271/2002-01-0296.
- Ozawa, Y. et al. Oil Film Pressure Measurement & Evaluation of the Large Scale Diesel Engine Main Bearing Under Fluctuating Load by the Test Rig. JSME Kansai Ordinary General Meeting PROCEEDINGS No.984-1 1998
- Mihara, Y. et al. Study on the Measurement of Oil-Film Pressure of Engine Main Bearing by Means of New Developed Thin-film Sensor under Engine Operating conditions Proc. of JSAE,No.9433894 1994
- Mihara, Y. et al. Study on the Development of Thinfilm Sensor for Oil Film Pressure Proc. of The 75 th JSME Spring Annual Meeting(3) No.98-1 559 560
- Priebsch, H.H. et al Application of an Elastohydrodynamic Calculation Method for the Analysis of Crank Train Bearing The American Society of Mechanical Engineers 95-ICE-1 1995
- Ushijima, K. et al. A Study on Engine Bearing Performance Using EHL Analysis and Experimental Analysis The 13 th Internal Combustion Engine Symposium Japan Proceedings 29 169 174
- Okamoto, Y. et al. Theoretical Analysis of Bearing with Considering an Elastic Deformation Proc. of JSAE No. 9833124 1998
- Okamoto, Y. et al. A Study for Wear and Fatigue on Engine Bearings by Using EHL Analysis Proc. of JSAE No.9933934 1999