Steel Disc Couplings Product Paper & Tech Paper

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Your system supplier for every aspect of power transmission We say what we mean and mean what we say. We see things from our customers‘ perspective. We are considerate of our employees and their families as well as of our environment and society. RINGFEDER POWER TRANSMISSION is the global market leader in the niche markets of drive technology and is well regarded for its customer-specific, application-oriented solutions that ensure excellent and failure-free operation for its clients. We offer locking devices, damping technology and couplings for OEMs but also for the final customer under our...

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Your projects are our drive Know-how: Over 90 years of expertise. Rely on decades of engineering expertise from the inventor of the friction spring. As an expert in drive and damping technology, we are your reliable partner wherever forces are at work. Be it the permanent transfer of very high torques due to non-positive or positive connections or the absorption and trapping of extreme energies to protect expensive constructions. Your expert partner: From development to the finished product. We accompany you through to the successful completion of your project. Beginning with the development...

Steel Disc Couplings RINGFEDER® TND Torsionally rigid, absolutely backlash-free RINGFEDER® TND Steel Disc Couplings are suitable for the most diverse applications and particularly ideal for all drive tasks requiring freedom from wear and maintenance as well as excellent misalignment compensation and positioning accuracy. The core component of these powerful couplings are disc packs developed on the basis of in-depth FEM analysis. They consist of multiple circular, torsionally flexible single discs made of stainless spring steel which are connected by means of high-precision sleeves to form a...

One Coupling Series, Numerous Advantages Shrink Disc Disc Pack Zero Backlash RINGFEDER® Steel Disc Couplings transmit the required torque in both directions with zero backlash – an indispensable precondition for their use in machines and plants with synchronous operation, frequent starts and stops or reversing operation. They are also the perfect choice for applications requiring the highest positioning accuracies and for variable-speed drives. Torsional Stiffness The premium-quality all-steel construction and the optimal design of the disc packs, made of corrosion-resistant spring steel, ensure...

Coupling Configuration From the outset, the RINGFEDER® TND series has been designed as a highly flexible modular system so that customers will always benefit from a coupling solution that is optimally suited to their specific application requirements. Customized special designs made-to-order which go beyond the individualization and selection options of the standard coupling types offered can thus be realized efficiently upon request. Generally, every coupling type is composed of an input-side and output-side coupling hub as well as a connecting element that is either embodied by a single disc...

Disc Packs The FEM-optimized disc packs are the characteristic and functional key element of the RINGFEDER® Steel Disc Couplings. The packs are comprised of multiple circular single discs of the same thickness made of corrosion resistant spring steel. These discs are firmly connected to form a compact unit by means of precision sleeves. To reduce stress peaks that are mainly applied to the outer discs when shaft misalignments occur, the precision sleeves are equipped with specially produced relief grooves. High-strength fitting screws alternately connect the disc packs with the coupling hubs...

S Single-Jointed, without Spacer Hub X Hub with Shrink Disc Hub X Hub with Shrink Disc D Double-Jointed, with Spacer Spacer D Hub O Standard Hub with Open Flange C Double-Jointed, with Compact-Spacer Hub O Standard Hub with Open Flange 2 disc packs (HD or HT) Hub Q Hub with Open Flange and Shrink Disc The smart modular system of the RINGFEDER® TND series guarantees users maximum flexibility and customizability to fulfil the specific requirements of their individual drive task. By virtue of the various combination possibilities and multiple extension options, further coupling types are realizable...

Coupling Dimensioning Selection Guide The selection of the correct coupling size is based on the torque to be transmitted and the given shaft dimensions. In addition, other conditions of the specific application situation have to be considered, e.g. operating speed, shaft misalignments and the need for spacers to accommodate larger shaft distances. The nominal torque TKN of the RINGFEDER® TND Steel Disc Couplings can be transmitted continuously if the specified selection and operating criteria are met. Coupling dimensioning is based Always make sure that the specified limit values are never exceeded...

3. Check the impact of short-term torque peaks acting on the coupling TKN = Nominal torque of coupling Tmax = Max. torque of machine* acc. to data in the Tech Paper e.g. at the start of an electric motor: Tmax = TKipp TKipp =Tipping torque by starting with directly engaged asynchronous motor, e.g. TKipp ~ 2 · TN; please observe the specific details provided by the motor supplier. = 1.5 is applicable for reversing torque; otherwise: SZ = 1 4. Make certain that the coupling is capable of handling the occurring shaft misalignments Existing or expected angular, axial and radial shaft misalignments...

4.2 Couplings with two disk packs (e.g. coupling type TND HDH) Couplings with two disc packs are able to compensate for axial, angular and radial shaft misalignment. Accordingly, the following equation applies: Diagram 2: Miasalignment Chart for Couplings with two Disc Packs (Double-Jointed Design) DKaB DKwB DKrB + + ≤1 DKa DKw DKr acc. to data in the Tech Paper acc. to data in the Tech Paper ∆Kr = Max. radial misalignment as a function of the angle [deg.] acc. to data in the Tech Paper Index B = Value in state of operation The following equation applies per disc pack: Equation 6) [deg.] acc....