FLENDER Standard Couplings Flexible Couplings — N-EUPEX and N-EUPEX DS Series © Siemens AG 2015 General information Power ratings of the N-EUPEX DS series 7 Flexibles of sizes 66 to 272 are of the compound type with a hard core and soft thrust pieces. Sizes 305 to 556 are completely made of 90 ShoreA NBR material. For maximum coupling torque: T Kmax = 2.0 ⋅ T KN For coupling overload torque: T KOL = 3.0 ⋅ T KN For coupling fatigue torque: T KW = 0.15 ⋅ T KN Torsional stiffness and damping 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. The maximum speed for the respective coupling size must be noted! Δ K perm = Δ K 1500 ⋅ FKV The values stated in the above table apply to a capacity utiliza- tion of 50 %, an excitation amplitude of 10 % T KN with the fre- quency 10 Hz and an ambient temperature of 20 °C. Dynamic torsional stiffness is dependent on load and increases in propor- tion to capacity utilization. The following table shows the correc- tion factors for different rated loads. Correction factor FKV 1.7 1.2 1.0 0.7 C Tdyn = C Tdyn 50 % ⋅ FKC 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. Correction factor FKC 0.7 0.9 1 1.1 1.2 1.3 1.5 Shaft misalignments Δ K r and Δ K w may occur simultaneously. The damping coefficient is Ψ = 1.4 Torsional stiffness and damping is further dependent on the am- bient temperature and the frequency and amplitude of the tor- sional vibration excitation. More precise torsional stiffness and damping parameters on request. 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. 1) Does not apply to type HDS.
7/8 Siemens MD 10.1 · 2015 Size Rated torque Torsional stiffness at 50 % capacity utilization Assembly Permitted shaft misalignment at speed n = 1500 rpm Gap dimension 1) Radial Angle TKN CTdyn ΔS ΔKr ΔKw Nm kNm/rad mm mm ° 66 19 0.73 1.0 0.2 0.15 76 34 1.36 1.0 0.2 0.15 88 60 2.62 1.0 0.2 0.12 103 100 4.00 1.0 0.2 0.12 118 160 6.30 1.0 0.2 0.10 135 240 10.5 1.0 0.25 0.10 152 360 13.6 1.0 0.25 0.10 172 560 27.2 2.0 0.3 0.10 194 880 47.0 2.0 0.3 0.10 218 1340 70.0 2.0 0.3 0.09 245 2000 106 2.0 0.35 0.09 272 2800 149 2.5 0.35 0.08 305 3900 214 2.5 0.4 0.08 340 5500 350 2.5 0.4 0.08 380 7700 480 2.5 0.5 0.08 430 10300 730 2.5 0.5 0.08 472 13500 990 2.5 0.6 0.08 514 16600 1270 2.5 0.6 0.07 556 21200 1540 2.5 0.65 0.07 Speed in rpm 500 1000 1500 3000 Capacity utilization TN / TKN 20 % 40 % 50 % 60 % 70 % 80 % 100 %