Journal Center Orbits in Piston Engine Bearings

This paper deals with the classic problem of dynamically loaded bearings. It differs from previous, related work by being directed toward the engine designer rather than a Ph.D. thesis committee. An automotive engineer, aided by a computer, can use the included computation procedure to get a reasonable picture of bearing performance. He can discover the effect of changes in speed, power, dimensions, and oil on potential trouble spots, and he can see the difference in behavior of main bearings, crankpin bearings, and wrist pin bushings. Typical orbit diagrams, based on this procedure, are included for comparison with photographs of test bearings for which the journal paths were drawn.