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Gear Selection Examples

Gear Selection Examples. Main Hoist for STS Type Helical Qty/crane 2 Shaft position 124 Ratio 21.3 Motor power kW 510 Max.motor power kW 1.4 x Motor speed rpm 650 Max.motor speed rpm 1460 Motor torque Nm 7500 Classification FEM T7/L3/M8 Radial force HSS 32 kN

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Gear Selection Examples

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  1. Gear Selection Examples • Main Hoist for STS • Type Helical • Qty/crane 2 • Shaft position 124 • Ratio 21.3 • Motor power kW 510 • Max.motor power kW 1.4 x • Motor speed rpm 650 • Max.motor speed rpm 1460 • Motor torque Nm 7500 • Classification FEM T7/L3/M8 • Radial force HSS 32 kN • LSS 87.5 kN (60°up) • Bearing lifetime hrs 25,000 • Total shaft CD mm 1240 • LSS solid • HSS solid • Peak load kNm 300 • ambient temperature -25°~+40°C • gear housing steel welded horizontal split • 3 point support Motor can be over-loaded for a short to 140% ~ 160% during acceleration

  2. 3.1. Crane Series / Standard • Type 3rd 2nd 1st Total Mn2/kNm • stage stage stage in mm • 3C450NE-1000 450 320 230 1000 170 • 3C475NE-1055 475 340 240 1055 200 • 3C500NE-1110 500 360 250 1110 230 • 3C530NE-1180 530 380 270 1180 265 • 3C560NE-1240 560 400 280 1240 305 • 3C595NE-1320 595 425 300 1320 355 • 3C630NE-1400 630 450 320 1400 410 • 3C670NE-1485 670 475 340 1485 470 • 3C710NE-1570 710 500 360 1570 540 • 3C755NE-1665 755 530 380 1665 620 • 3C800NE-1760 800 560 400 1760 710 • 3C850NE-1870 850 595 425 1870 805 • 3C900NE-1980 900 630 450 1980 910 Remark! These values and all the information can be used only as a guideline! Every special hoist drive unit (main hoist or boom hoist) will be calculated separately by SEW IG !

  3. Gear Selection Examples FEM gives FS2 =1.4 , FF2 =1.75 Mk2 = 510 x 9550 x 21.3 / 650 = 159 kNm MN2 >= Mk2x FS= 159 kNm x 1.4 = 223 kNm ---> size 560, ratio = 21.3 ---> 3 stages ---> 3C560NE-1240 gives actual MN2 = 305 kNm The gearbox is able to take a short time load of 2 x PN1. therefore it is important to check the peak load conditions. Mk2 (peak) = 300 kNm 2 x MN2 >= Mk2 (peak) x FF2 2 x 305 kNm > 300 x 1.75 kNm, 610 kNm > 300 x 525 kNm ---> OK Radial load must be checked with Henw calculation separately by designer. There may need to modify the bearing size, which in turns change some of the shaft dimension in each case.

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