TORSIONAL COUPLINGS LM TECHNICAL DATA - NATURAL RUBBER 37 Coupling Size Shore Hardness (Durometr) SHORE A Nominal Torque TKN (Nm) Maximum Torque TKmax (Nm) * Continuous Vibratory Torque Tkw (Nm) Allowable Power Loss Pkv (W) ** Dynamic Torsional Stiffness Ctdyn (Nm/rad) Flange Size SAE J620 Flywheel Maximum Speed Mmax (RPM) Mass Moment of Inertia *** Primary J1 (kgm2) Secondary J2 (kgm2 LM240 50 250 500 100 37 925 8 10 4000 3600 0.0208 0.0313 0.0038 60 300 600 120 1400 70 350 750 140 2250 LM400 50 400 800 160 62 1600 10 3600 0.0373 0.0114 60 500 1000 200 2500 70 550 1100 220 4000 LM800 50 700 1400 280 105 2800 10 3600 0.0599 0.0296 60 850 1700 340 4200 11½ 3500 0.0732 0.0296 70 950 2000 380 6800 14 3000 0.1378 0.0295 LM1200 50 1000 2000 400 150 4500 11½ 14 3500 3000 0.0768 0.01432 0.0456 60 1200 2400 480 7000 70 1300 3000 520 11700 LM1600 50 1450 2900 580 220 6000 11½ 14 16 18 3200 3000 2500 2300 0.224 0.197 0.274 0.3855 0.078 60 1800 3600 720 9000 70 2000 4000 800 15000 LM2400 50 2000 4000 800 300 10000 14 300 0.213 0.153 60 2500 5000 1000 15000 16 2500 0.290 70 2800 6000 1120 25000 18 2300 0.4015 LM2800 50 2800 6000 1120 360 25000 14 3000 0.2836 0.2257 60 3000 7500 1200 37500 16 2500 0.3158 70 3200 8000 1280 63000 18 2300 0.4271 LM3500 50 3200 6500 1280 450 16000 14 3000 0.2836 0.2295 60 3500 8000 1400 24000 16 2500 0.4388 70 3800 8500 1520 38000 18 2300 0.5873 *** Primary means the flywheel side of the coupling. ** Constant value for natural rubber because of linear characteristic. * At 10 Hz. Temperature Factor St1 Temperature Factor St2 for continuous vibratory torque Tkw and allowable power loss Pkv Resonance Factor VR, Relative Damping Factor < Natural Rubber (NR) f in Hz Vr < 35 - 40 12 0.52 50 6.0 1.05 60 5.7 1.10 70 5.5 1.15 Frequency Factor Sf f in Hz < 10 >10 Sf 1 f/10 #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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