© Siemens AG 2015 FLENDER Standard Couplings Highly Flexible Couplings — ELPEX-S Series General information Torsional stiffness Correction factor FKC The dynamic torsional stiffness of the silicone rubber elements is load-dependent and increases in proportion to the load. The val- ues specified in the selection table represent 100 % loading. The following table shows the correction factors for different rated loads. 0.42 0.57 0.64 0.72 0.8 1 1.6 Torsional stiffness also depends on the ambient temperature and the frequency and amplitude of the torsional vibration exci- tation. More precise torsional stiffness and damping parameters on request.
C Tdyn = C Tdyn 100 % ⋅ FKC With elastic couplings the manufacturing process of the rubber elements and their aging primarily influence the rigidity value C Tdyn . For this reason calculation must be made with a tolerance for the dynamic rigidity of ± 20 %. The specified damping coeffi- cient Ψ is a minimum value with the result that the damping per- formance of the coupling corresponds at least to the specified value. Damping coefficient of the rubber versions WN 50° … 55° 0.80 NN 60° … 65° 1.15 SN 70° … 75° 1.25 NX 55° … 65° 1.15 11 For fitting, a maximum gap dimension of S max. = S + Δ S and a minimum gap dimension of S min. = S – Δ S are permitted.
The maximum speed for the respective coupling size and type must be noted! Permitted shaft misalignment The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The following table shows the correction factors for different speeds. Δ K perm = Δ K 1500 ⋅ FKV Correction factor FKV 1.2 1.1 1.0 0.7 11/7 Siemens MD 10.1 · 2015 Rubber disk elements made of silicone rubber Type Size Rubber version Rated torque Maximum torque Overload torque Fatigue torque Dynamic torsional stiffness for 100 % load TKN TKmax TKOL TKW (10 Hz) CTdyn Nm Nm Nm Nm kNm/rad ESN . 220 NX 200 300 400 87 1.70 ESN . 265 NX 300 450 600 133 3.10 ESN .
290 NX 500 750 1000 213 5.40 ESN . 320 NX 770 1150 1530 320 12.0 ESN . 360 NX 1200 1800 2400 480 12.7 ESN . 420 NX 2000 3000 4000 800 30.0 ESN . 465 NX 3000 4500 6000 1200 53.0 ESN . 520 NX 4100 6100 8200 1600 75.0 ESD . 520 NX 8200 12300 16400 3200 150 ESN . 560 NX 5000 7500 10000 2200 83 ESD . 560 NX 10000 15000 20000 4400 166 ESN . 580 NX 6500 9750 13000 2667 113 ESD . 580 NX 13000 19500 26000 5867 226 ESN . 680 NX 10000 15000 20000 4000 225 ESD . 680 NX 20000 30000 40000 8000 450 ESN . 770 NX 15000 22500 30000 6000 480 ESD .
770 NX 30000 45000 60000 12000 960 Load TN / TKN 20 % 50 % 60 % 70 % 80 % 100 % 150 % Rubber version Hardness Damping coefficient ShoreA ψ Size Assembly Permitted shaft misalignment at n = 1500 rpm Axial Radial Angle ΔS ΔKa ΔKr ΔKw mm mm mm degrees 220 1.3 0.2 1.2 0.5 265 1.3 0.2 1.2 0.5 290 1.5 0.2 1.2 0.5 320 1.5 0.2 1.2 0.5 360 1.5 0.2 1.2 0.5 420 1.5 0.3 1.3 0.4 465 1.7 0.3 1.3 0.4 520 1.7 0.3 1.4 0.4 560 1.7 0.3 1.4 0.4 580 1.8 0.4 1.5 0.3 680 1.8 0.4 1.5 0.3 770 2.0 0.5 1.5 0.3 Speed in rpm 500 1000 1500 3000