www.jbj.co.uk/couplings.html#flender Radial misalignment ΔKr mm Radial misalignment of the coupling halves. Key to symbols Overload torque TOL Nm Very infrequently occurring maximum load, e.g. during short circuit or blocking conditions. Fatigue torque TW Nm Amplitude of the dynamic coupling load. Coupling overload torque TKOL Nm Torque which can very infrequently be transmitted as maximum torque by the coupling. Resonance factor VR Factor specifying the torque increase at resonance. Temperature Ta °C Ambient temperature of the coupling in operation. Torsional stiffness, dynamic CTdyn Nm/rad For calculating torsional vibration. Name Symbols Unit Explanation. Excitation frequency ferr Hz Excitation frequency of motor or driven machine. Moment of inertia J kgm2 Moment of inertia of coupling sides 1 and 2. Axial misalignment ΔKa mm Axial misalignment of the coupling halves. Service factor FB Factor expressing the real coupling load as a ratio of the nominal coupling load. Angular misalignment ΔKw ° Angular misalignment of the coupling halves. Temperature factor FT Factor taking into account the reduction in strength of flexible rubber materials at a higher temperature. Weight m kg Weight of the coupling. Rated power PN kW Rated output on the coupling, usually the output of the driven machine. Rated torque TN Nm Rated torque as nominal load on the coupling. Rated speed nN rpm Coupling speed. Frequency factor FF Factor expressing the frequency dependence of the fatigue torque load. Maximum coupling speed nKmax rpm Maximum permissible coupling speed. Maximum torque Tmax Nm More frequently occurring maximum load, e.g. during starting. Rated coupling torque TKN Nm Torque which can be transmitted as static torque by the coupling over the period of use. Maximum coupling torque TKmax Nm Torque which can be frequently transmitted (up to 25 times an hour) as maximum torque by the coupling. Fatigue coupling torque TKW Nm Torque amplitude which can be transmitted by the coupling as dynamic torque at a frequency of 10 Hz over the period of use. Damping coefficient Ψ psi Damping parameter. Selection of the Coupling Series The coupling series is frequently determined by the driven machine and the design of the drive train. Common selection criteria are listed below and assigned to coupling properties, which are used to select the coupling series. Additionally, the price of the coupling and availability are important criteria for determining the coupling series to be used. FLUDEX couplings are used to reduce starting and/or overload torques. During starting, the motor may, for example, run up within a very short time; because of the FLUDEX coupling, the drive train with the drivenmachinemay accelerate after a delay and without increased torque load. The FLUDEX coupling cannot compensate for shaft misalignment and is therefore designed in combination with a displacement coupling, a cardan shaft or a belt drive. The displacement couplingmay be selected in accordance with the criteria described below. The FLUDEX series operates positively and transmits the torque with the aid of a flowing oil or water filling. Torque Range Rated Coupling Torque TKN Speed Range Peripheral Speed v = DA • n /19100 max max Torsionally Rigid Torsionally Flexible Highly Flexible Operating Temperature Range Coupling Type N-ARPEX 350 ... 2000000 Nm 110 m/s ■ – – -50 ... +280 °C N-BIPEX 12 ... 4650 Nm 45 m/s – ■ – -50 ... +100 °C ZAPEX 850 ... 7200000 Nm 60 m/s ■ – – -20 ... +80 °C N-EUPEX 19 ... 62000 Nm 36 m/s – ■ – -50 ... +100 °C ELPEX-S 330 ... 63000 Nm 66 m/s – – ■ -40 ... +120 °C RUPEX 200 ... 1300000 Nm 60 m/s – ■ – -50 ... +100 °C ELPEX 1600 ... 90000 Nm 60 m/s – – ■ -40 ... +80 °C N-EUPEX DS 19 ... 21200 Nm 36 m/s – ■ – -30 ... +80 °C ARPEX 92 ... 2000000 Nm 100 m/s ■ – – -40 ... +280 °C ELPEX-B 24 ... 14500 Nm 35 m/s – – ■ -50 ... +70 °C 6 #DriveLineHarmony Technical Information Mechanical Power Transmission Couplings
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