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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...

RINGFEDER® Elastomer Jaw Couplings Torsionally flexible Puncture-proof Backlash-free Compensation of misalignments (axial, radial, angular) Axially pluggable Low-maintenance Temperature range

Introduction The rotationally resilient couplings of the RINGFEDER® series GWE, TNM, TNS und TNB are puncture-proof and flexible in all directions and therefore compensate for angular, parallel and axial shaft misalignments of the connected machines. Misalignments can be caused for example by inaccurate assembly, heat movements or settling phenomena. Environmental conditions Avoiding torsional vibration The coupling should only be operated in normal industrial air. Aggressive media may attack the coupling components, bolts and elastic elements and therefore present a danger to the operational...

Torque characteristics at operating point on outputside Constant, uniform without torque variation Minimum load factor SL Torque characteristics Uniform with little variations, slight shocks Non-uniform, also API-671, API-610 moderate shocks Drive side E-Motor, turbine Hydraulic motor Combustion machine 1 to 3 cylinders, U-degree > 1:100 SA = Load factor of drive side: * We recommend for drivers with combustion machines to examine by a „TVA“ - torsiona vibration calculation which coupling is suitable for the application. Ambient temperature range Own specification/ personal vibration calculation...

Dimensioning of coupling The dimensioning of the elastic RINGFEDER® couplings is based on the nominal torque TN and maximum impact torque Tmax of the machines. Equation 1) = Nominal torque of machine [Nm] The following equation applies when subjected to the nominal torque: Equation 2) TKN = Nominal torque of coupling = Nominal torque of machine = Load factor of drive side = Load factor of output sidee Verifying the maximum torque of the coupling The following equation applies for transient impact torques, which occur e.g. by starting an electric motor Equation 3) TKmax = Maximum torque of the...

Dimensioning example Preselected type: RINGFEDER® TNB BHDD* Example for dimensioning a coupling for a pump drive with electric motor type IEC 355. Input power PN = Load factor Drive motor Directly engaged asynchronous motor (∆-connection) Load factor of drive side SA = Working machine Centrifugal pump Load factor of output side SL = Required nominal torque of the coupling TKN > Following the catalogue data the coupling is selected with a coupling size of BHDD 300 with intermediate ring VkR and a nominal coupling torque of 6000 Nm. The dimension of coupling RINGFEDER® BHDD 300 is OK for the performance...

Technical installation instructions Arrangement of the coupling parts Observe restoring forces The arrangement of the coupling hubs on the shaft ends that are to be connected is free in principle. For couplings with attachment parts such as brake discs and drums these should be attached to the drive side that is to be locked. The hubs must be placed flush with the shaft end in order to make the shaft-hub connection stable. The coupling compensates the permissible misalignments with low restoring forces. Please observe the alignment values specified in the assembly and operation manual. If highly...

Backlash-free Elastomer Jaw Couplings RINGFEDER® GWE Backlash-free RINGFEDER® GWE jaw couplings are used in engineering where high positioning precision requires vibration damping in greatly accelerated processes and the use of plug-in coupling solutions is preferred. Applications Encoder Precision drives Feed drives Grinding and milling spindles Machine tools Packing machines Characteristics · Advantages Robotics Transfer lines Backlash-free, through pre-stressing Pluggable Vibration damping Torques from 0,5 – 650 Nm Compensation of radial, axial and angular misalignment Electrically isolating...

Elastomer Jaw Couplings RINGFEDER® GWE Technical description Every hub on the RINGFEDER® GWE jaw coupling has concave jaws on its face. The function of the coupling to transmit torque and damp impact that occurs, as well as balancing out unavoidable misalignments, is enabled through the joining of two hubs and the filling of the created free space with an elastic sprocket. The GWE jaw couplings are backlash-free in order to also achieve a high level of positioning precision in reverse operation. The coupling is backlash- free as a result of the pressure pre-tensioning of the individual buffers...

Elastomer Jaw Couplings RINGFEDER® GWE TKN – Nominal torque of coupling (Nm): Continuous torque which can be transmitted throughout the entire speed range, taking into consideration operational factors such as ambient temperature, operating, impact and start-up factors. The shaft-hub connection must be tested by the customer. TKmax – Maximum torque of coupling (Nm): Torque which can be transmitted >105 time as a peak load or 5 x 104 times as an alternating load during the entire life of the coupling taking into consideration factors such as temperatures, torsional stiffness and shock loading....