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Open AccessArticle

On Hirth Ring Couplings: Design Principles Including the Effect of Friction

Department of Industrial Engineering (DIN), University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy
GIULIANI, Bucci Automations S.p.A. Division, Via Granarolo 167, 48018 Faenza, Italy
Author to whom correspondence should be addressed.
Actuators 2018, 7(4), 79;
Received: 21 October 2018 / Revised: 14 November 2018 / Accepted: 17 November 2018 / Published: 21 November 2018
Rings with Hirth couplings are primarily used for the accurate positioning of axial-symmetric components in the machine tool industry and, generally, in mechanical components. It is also possible to use Hirth rings as connection tools. Specific industries with special milling and grinding machines are able to manufacture both tailor made and standard Hirth rings available on stock. Unfortunately, no international standard (for instance ISO, DIN or AGMA) is available for the production and the design of such components. In the best-case scenario, it is possible to find simplified design formulae in the catalogue of the suppliers. The aim of this work is to provide some accurate formulae and computational methods for design to provide better awareness on the limitations and the potential of this type of connection. The work consists of five parts: (i) a review of the base calculation derived mainly from the catalogues of manufacturers; (ii) an improved calculation based on a new analytical method including the friction phenomenon; (iii) an experimentation run for validating the method; (iv) a case study applied to a machine tool; and, (v) a closed form formulation to determine an upper threshold for friction, thus ensuring the Hirth coupling regular performance. View Full-Text
Keywords: Hirth rings; connection; serration; frontal teeth; friction; self-centering Hirth rings; connection; serration; frontal teeth; friction; self-centering
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Croccolo, D.; De Agostinis, M.; Fini, S.; Olmi, G.; Robusto, F.; Vincenzi, N. On Hirth Ring Couplings: Design Principles Including the Effect of Friction. Actuators 2018, 7, 79.

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