Introduction The name "EUPEX" comes from ancient Greek and means "well connected." These couplings by Flender GmbH are as durable as the ancient Greek name is old. The manufacturer of gear units, couplings, generators and complete drive systems has been producing the EUPEX coupling for about one hundred years, ever since the company's founder, Alfred Friedrich Flender, had this name entered as a trademark in the registry of the Patent Office of the German Reich on December 22, 1923. The successor to these couplings, N-EUPEX®, has been manufactured since 1967 and there are millions of them all over the world in every industrial sector. To continue to meet the high expectations for the product in the coming decades as well, the development team has made some changes to the series. New types were added to the modular principle of N-EUPEX. Couplings with a torque limiter, with a clamping element as well as with a short double-cardanic design will now be added to the existing short and long types. In addition, elastomers made of TPU are offered. Moreover, both the performance and the bore capacity were increased for all types in the series in 2020. The following pages contain detailed information and the advantages regarding these changes. 1. Increased Combination Variety Due to Special Features Flender expands the portfolio of the flexible N-EUPEX coupling series so that the variety of combinations has been increased. The new introductions allow users additional flexibility in their plants without losing the compact design and high load capacity of a pin coupling. The enhancements provide a wide range of sustainable options for further optimizing themachines and reducingmaintenance. » 1.1 Torque limiter for more safety in the drivetrain The new N-EUPEX ERN coupling is equipped with a torque limiter, which provides even more security in the drivetrain in many applications. Users can specify a maximum torque and thus protect machines and systems from overload. The coupling never transmits torques that are critical for the motor or output machine. The coupling's slipping unit has friction linings which are preloaded by means of disk springs. If the static friction is exceeded in the event of an overload, the system slips and thus protects the system fromoverload damage.As soon as the slipping torque is undershot again and the overload is damped out of the system, the system engages and torque transmission continues. We are therefore talking about a load-holding system. The slipping torque can be regulated per coupling size within an adjustment range via the preload of the disk springs. By using the safety element, the components of the drive and driven machine are protected from damage. This eliminates the need to replace potentially expensive spare parts and, often more importantly, long downtimes of the drivetrain. Costly repairs can be avoided. In short, plant availability is significantly increased with the new type ERN. » 1.2 Clamping elements as a practical shaft-hub connection Another feature that is a useful addition to the modular system of pin couplings is the type with clamping elements. It is well known that there are a number of proven solutions for shaft-hub connections. In industry, the feather key connection is frequently encountered when releasable connections have to bemade. In addition to this industry standard, frictionally engaged clamping connections using clamping elements are also widely used. In this case, the plain, cylindrical machine shaft end is connected to the coupling hub via a clamping connection without a feather key. Flender now include this solution in its portfolio in a standardized form in conjunction with type N-EUPEX B. The main advantage of this shaft-hub connection becomes especially apparent in the course of service work, for example during assembly or when replacing worn elastomers, which can be carried out more easily. With this type of connection, in contrast to the feather key connection, the usual heating of the hub parts before tightening is not required. The hubs are also very easy to remove during disassembly after the clamping screws of the clamping elements have been loosened, thus restoring sufficient play in the connection between the shaft and coupling. No connecting machine components have to be moved, which reduces the time required and also the machine downtime. Additional tools such as mechanical three-arm pullers are not required. #PROGRESSION~N-Eupex Torsionally Flexible Couplings www.jbj.co.uk/couplings.html#flender 37 #DriveLineHarmony
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