Installation Tools for Hydraulically Fitted Coupling Hubs - Precautions and Design Requirements
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The tools used to install hydraulically fitted hubs need to be as carefully designed and manufactured as the couplings themselves. The authors describe an installation of coupling hubs on upgraded machines where tools that were designed to be used on a coupling for a 6.0 in diameter shaft were adapted to mount a coupling on an 8.0 in shaft. The larger forces involved caused a threaded rod to fracture and the coupling hub to be expelled from the shaft end with considerable force and velocity. An after-the-fact analysis of these "design alpha" tools is presented, along with a technical description of the forces acting upon a newly mounted hub and the velocity with which such a hub could be expelled from a shaft end. The 8.0 in hub was successfully installed on the shaft using modified "design alpha" tooling for expediency, but this modification was considered to be only a stopgap solution. The authors designed new "design beta" tools to accomplish the installation of the coupling hubs safely. The analysis of the "design beta" tools is described along with the important criteria to be considered for coupling hub installation tools.
Gibbons, C. B.; Hearne, Nigel (1997). Installation Tools for Hydraulically Fitted Coupling Hubs - Precautions and Design Requirements. Texas A&M University. Turbomachinery Laboratories. Available electronically from