Correct coupling selection guide

www.jbj.co.uk/couplings.html#flender 15 #DriveLineHarmony Temperature Factor FT Temperature T on the Coupling a Elastomer Low Coupling under -30°C up up to up to up to up to up to up to up to Material Temperature °C -30°C to 50°C 60°C 70°C 80°C 90°C 100°C 110°C 120°C N-EUPEX NBR -30 – 1.0 1.0 1.0 1.0 – – – – 1) N-EUPEX NR -50 1.1 1.0 – – – – – – – N-EUPEX HNBR -10 – 1.0 1.0 1.0 1.0 1.25 1.25 – – N-EUPEX DS NBR -30 – 1.0 1.0 1.0 1.0 – – – – RUPEX NBR -30 – 1.0 1.0 1.0 1.0 – – – – RUPEX NR -50 1.1 1.0 – – – – – – – RUPEX HNBR -10 – 1.0 1.0 1.0 1.0 1.25 1.25 – – N-BIPEX TPU -50 1.0 1.0 1.0 1.0 1.0 1.0 1.0 – – ELPEX NR -40 1.1 1.0 1.25 1.40 1.60 – – – – ELPEX-B NR -50 1.1 1.0 – – – – – – – ELPEX-B CR -15 – 1.0 1.0 1.0 – – – – – ELPEX-S SN, NN, WN NR -40 1.1 1.0 1.25 1.40 1.60 – – – – ELPEX-S NX VMQ -40 1.1 1.0 1.0 1.0 1.0 1.1 1.25 1.4 1.6 1) The N-EUPEX coupling is not suitable for shock loads when used at low temperatures. Coupling Size Selection Mechanical Power Transmission Couplings NR = natural rubber, natural-synthetic rubber mixture. NBR = nitril-butadiene-rubber (Perbunan). HNBR = hydrated acrylonitrile butadiene rubber. CR = chloroprene rubber (FRAS fire-resistant and anti-static). VMQ = silicone. TPU = polyurethane. Coupling size T ≥ T • FB • FT KN N In the case of ARPEX and ZAPEX coupling types, no temperature factor (FT = 1.0) need be taken into account. Coupling Load at Maximum and Overload Conditions The maximum torque is the highest load acting on the coupling in normal operation. Maximum torques at a frequency of up to 25 times an hour are permitted and must be lower than the maximum coupling torque. Examples of maximum torque conditions are: Starting operations, stopping operations or usual operating conditions with maximum load. T ≥ T • FT Kmax Max Overload torques are maximum loads which occur only in combination with special, infrequent operating conditions. Examples of overload torque conditions are: Motor short circuit, emergency stop or stalling 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. T ≥ T • FT KOL OL

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