July 2015

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HP Engineering Case Histories: Case 85: Learnings on hydraulically fitted hubs

Hubs connect one piece of machinery to another, usually with some flexible coupling between them. Installers have only limited time to work with the hot hub. When incorrectly positioned, it may have to be removed, which has the potential of damaging the shaft end.

Sofronas, A., Consulting Engineer

This article is a brief tutorial on hydraulically fitted hubs. It is intended to alert the reader to major safety concerns when removing hydraulically fitted hubs. What is the purpose of a hub? Hubs connect one piece of machinery to another, usually with some flexible coupling between them. On straight-end shafts, hubs may be installed by press fits or heating. On taper-end shafts, the hubs may be heated and then advanced for a desired interference fit. One problem is that the installers have only limited time to work with the hot hub. When incorrectly positioned, it may have to be removed. This has the potential of damaging the shaft end. Why are hydraulically fitted hubs used? A method

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