www.jbj.co.uk/couplings.html#flender CR = chloroprene rubber (FRAS fire-resistant and anti-static). TPU = polyurethane. NR = natural rubber, natural-synthetic rubber mixture. Applying the frequency factor FF, the dynamic torque loadmust be lower than the coupling fatigue torque. T ≥ T ⋅ FF KW W NBR = nitril-butadiene-rubber (Perbunan). HNBR = hydrated acrylonitrile butadiene rubber. VMQ= silicone. Coupling size T ≥ T • FB • FT KN N In the case ofARPEX and ZAPEX coupling types, no temperature factor (FT= 1.0) need be taken into account. Coupling load at maximumand overload conditions Themaximum torque is the highest load acting on the coupling in normal operation. Examples of maximum torque conditions are: Starting operations, stopping operations or usual operating conditions withmaximum load. T ≥ T • FT Kmax Max Examples of overload torque conditions are: Motor short circuit, emergency stop or blocking because of component breakage. Overload torques at a frequency of once a month are permitted and must be lower than the maximum overload torque of the coupling. The overload condition may last only a short while, i.e. fractions of a second. Coupling load due to dynamic torque load Maximum torques at a frequency of up to 25 times an hour are permitted andmust be lower than themaximum coupling torque. T ≥ T • FT KOL OL Overload torques aremaximum loads which occur only in combination with special, infrequent operating conditions. Dynamic torque load Frequency of the dynamic torque load Frequency of the dynamic torque load f ≤ 10 Hz frequency factor FF = 1.0 err f > 10 Hz frequency factor FF = √(f /10 Hz) err err Checking themaximumspeed Checking bore diameter, mounting geometry and coupling design The check must be made on the basis of the dimension tables. The maximum bore diameter applies to parallel keyways to DIN 6885. For other keyway geometries, themaximumbore diameter can be reduced. On request, couplings with adapted geometry can be provided. For the ZAPEX andARPEX series, the frequency factor is always FF = 1.0. The N-EUPEX DS, ELPEX-B, ELPEX-S and ELPEX coupling series throw overload. The elastomer element of these couplings is irreparably damaged without damage to metal parts when subjected to excessive overload. These coupling series are designated as non-fail-safe. These types that fail can be fitted with a so-called fail-safe device. This additional component enables emergency operation, even after the rubber element of the coupling has been irreparably damaged. Coupling behavior under overload conditions Selection of the Coupling Size For all load situations nKmax ≥ nmax For all load situations, the actual shaft misalignment must be less than the permitted shaft misalignment. The ZAPEX, N-ARPEX, ARPEX, N-EUPEX, RUPEX and N-BIPEX coupling series can withstand overloads until the breakage of metal parts. These coupling series are designated as fail-safe. Checking permitted shaft misalignment 9 #DriveLineHarmony Technical Information Mechanical Power Transmission Couplings
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