www.jbj.co.uk/couplings.html#flender 17 #DriveLineHarmony ELPEX-S Series Technical Specifications Highly Flexible Couplings Torsional Stiffness andDamping Torsional stiffness depends on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request. With flexible couplings themanufacturing process of the rubber elements and their aging primarily influence the stiffness value C . Tdyn For this reason a calculation must be made with a tolerance for the dynamic stiffness of ± 20%. The specified damping coefficient Ψ is a minimum value with the result that the damping performance of the coupling corresponds at least to the specified value. Technical Specifications Overload Torque TKOL (Nm) Overload Torque TKOL (Nm) Type Performance Ratings for Rubber Disk Elements made of a Silicone Rubber Fatigue Torque T (10 Hz) KW (Nm) Dynamic Torsional Stiffness for 100% Load CTdyn (kNm/rad) Rated Torque TKN (Nm) Maximum Torque TKmax (Nm) Size Rubber Version ESN 220 NX 200 300 400 87 1.3 ESN 265 NX 300 450 600 133 2.4 ESN 290 NX 500 750 1000 213 4.2 ESN 320 NX 770 1150 1530 320 9.2 ESN 360 NX 1200 1800 2400 480 10 ESN 420 NX 2000 3000 4000 800 23 ESN 465 NX 3000 4500 6000 1200 60 ESN 520 NX 4100 6100 8200 1600 65 ESD 520 NX 8200 12300 16400 3200 130 ESN 560 NX 5000 7500 10000 2200 100 ESD 560 NX 10000 15000 20000 4400 200 ESN 580 NX 6500 9750 13000 2667 160 ESD 580 NX 13000 19500 26000 5867 310 ESN 680 NX 10000 15000 20000 4000 280 ESD 680 NX 20000 30000 40000 8000 550 ESN 770 NX 15000 22500 30000 6000 620 ESD 770 NX 30000 45000 60000 12000 1230 Torsional Stiffness The dynamic torsional stiffness of the silicone rubber elements is load-dependent and increases in proportion to the load. The values specified in the selection table represent 100% loading. The following table shows the correction factors for different rated loads. C = C 100% • FKC Tdyn Tdyn Load TN / TKN 20% 50% 60% 70% 80% 100% 150% Correction factor FKC 0.59 0.75 0.79 0.83 0.88 1 1.5 Torsional stiffness also depends on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request. DampingCoefficient Damping coefficient of the rubber versions Rubber version Hardness ShoreA Damping coefficient Ψ WN 55 ° ± 5 ° 0.80 NN 65 ° ± 5 ° 1.15 SN 75 ° ± 5 ° 1.25 NX 60 ° ± 5 ° 1.15 With flexible couplings the manufacturing process of the rubber elements and their aging primarily influence the stiffness value C . For this reason Tdyn calculation must be made with a tolerance for the dynamic stiffness of ± 20%. The specified damping coefficient Ψ is a minimum value with the result that the damping performance of the coupling corresponds at least to the specified value.
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