Renold Couplings Highlights Folly Of Fuse Theory Fuse theory, a myth related to couplings, is costing industry a fortune, according to Paul Shuffleton, managing director of Renold Hi-Tec Couplings. According to fuse theory, rubber-in-shear type flexible couplings protect diesel-driven generator sets by failing or acting like a fuse when there is a potentially damaging short circuit. This is a myth, because the majority of rubber-in-shear couplings fail through fatigue rather than because of a short circuit. This is also the main reason for failing rubber blocks. Rubber-in-shear couplings consist of a rubber element fused in-between two metal hubs. One hub drives the other through the rubber, the flexing of which protects against shock and vibration. The coupling is only as strong as the rubber element, so if the rubber fails then the coupling fails too. When this happens on a diesel-driven generator set, some engineers believe there has been a short circuit and that the relatively ...
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