Power Transmission
Fig. 3. Helical beam couplings can be configured to accommodate large angular offsets.
number of coils and number of starts. By altering these, it is possible to create a flexure that meets the application’s specifications in terms of torque capacity, angular and parallel misalignment capabilities, and torsional and lateral bending rates. By adapting the design of the helical beam shaft coupling
concept, Abssac is also able to alter the coupling’s resonant frequency and improve its resistance to fatigue. Other design options include shaft connections that enable the assembly to be dismantled easily and quickly and flexure configurations that permit more angular offset than would be normal for this type of coupling (Fig. 3).
Miniaturisation ede_0809:ede_4c_0905 20.01.2010 7:44 Uhr Seite 1
With miniaturisation becoming commonplace, Abssac has also been asked to manufacture smaller couplings. For example, a fully functional 3.1 mm diameter shaft coupling was supplied for a medical application. Using a left- and right-handed
threaded shaft for attachment, the coupling could accept angular offsets while rotating at up to 10,000 RPM. The same customer then requested a double-start flexure with a 1.5 mm outside diameter produced in titanium. Clearly the ability to manufacture shaft couplings from
different materials is beneficial for some applications. Anodised aluminium is commonly used for helical beam couplings, but stainless steel is also a popular choice. For some applications, such as those in aerospace
equipment, titanium may be specified, and plastics can be used where the requirements for torque capacity, deflection, weight and cost make this option more suitable than other materials. Note that plastic couplings are available both as standard
products that have been injection moulded, and custom products that are machined from solid. In the case of machined plastic parts, of course, it is possible to
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