May 2009

Engineering Case Histories

Case 50: Gearbox input shaft failure analysis

Make sure the same failures are not repeated at your affiliated plant sites

Sofronas, A., Consulting Engineer

An analysis of a machine failure can be useful in determining what is and isn't the cause. With so many variables, it's helpful to eliminate some, as shown in this case history. The input shaft to a gearbox driving an 11,000-hp extruder cracked partially through (Fig. 1). Since there was heavy wear at R, the moment due to misalignment and the friction at these spline teeth were analyzed (Fig. 2).   Fig. 1    Cracked input shaft.    Fig. 2    Coup

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