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Gear are torsionally rigid and are supplied in two designs – completely flexible and flexible/rigid. A completely flexible coupling comprises two hubs with an external gear and two outer sleeves with an internal gear. It's a universal coupling for all sorts of applications and accommodates all possible misalignments (angular, offset, and combined) as well as large axial moments. Machines, bearings, seals, and shafts are therefore not subjected to the additional forces, sometimes of considerable magnitude, which arise from unavoidable misalignment usually associated with rigid shaft couplings.

Gear Coupling Size Chart

GD Type Gear Coupling

Size Coupling Rating Maximum Speed rpm Bore Dia OD mm Dimensions mm Solid Hub
kW at 100 rpm Rated Torque Nm Min. Bore Max. Bore ØA TL L ØB ØF M Gap Mass kg M.I. (WR²) kg-m²
GD-10 14 1337 8000 14 52 116 89 43 69 84 51 3 4.4 0.0052
GD-15 30 2865 6500 22 65 152 103 50 86 105 61 3 9 0.0192
GD-20 53 5061 5600 27 80 178 127 62 105 127 76 3 15 0.041
GD-25 105 10027 5000 32 98 213 159 77 131 155 92 5 27 0.105
GD-30 168 16043 4400 42 115 240 187 91 152 181 106 5 40 0.195
GD-35 231 22059 3900 47 135 279 220 107 178 211 130 6 65 0.454
GD-40 336 32086 3600 47 160 318 248 121 210 250 145 6 96 0.86
GD-45 472 45073 3200 52 180 346 278 135 235 274 165 8 131 1.39
GD-50 650 62070 2900 72 195 389 314 153 254 306 183 8 186 2.53
GD-55 880 84034 2650 72 215 425 344 168 279 334 203 8 247 3.83
GD-60 1205 115069 2450 77 235 457 384 188 305 366 228 8 299 5.21
GD-70 1823 174084 2150 92 280 527 451 221 356 425 266 9 473 11
GD-80 2639 252006 1750 95 285 590 508 249 385 485 300 10 682 20.72
GD-90 3037 290012 1550 100 300 660 565 276 420 535 325 13 898 34.95
GD-100 4100 391521 1450 120 330 711 623 305 470 595 355 13 1242 55.95

BGS Type Gear Coupling
Size Coupling Rating Max
Speed
rpm		 Min. Bore Dia mm  Max. Bore
Dia mm		 Dimensions mm Solid Hub
kW at
100 rpm		 Rated Torque
kNm		 Flex
Hub		 Rigid
Hub		 Flex
Hub		 Rigid
Hub		 ØA TL1 L ØB1 ØF ØB2 L2 M Gap Mass
kg		 M.I. (WR²) Kg-m²
BGS-10 14 1337 8000 14 18 52 60 116 87 43 69 84 84 40 51 4 4.5 0.0055
BGS-15 30 2865 6500 22 26 65 80 152 101 50 86 105 107 47 61 4 9.5 0.0204
BGS-20 53 5061 5600 27 30 80 90 178 125 62 105 127 130 59 76 4 15.5 0.0436
BGS-25 105 10027 5000 32 37 98 110 213 156 77 131 155 157 74 92 5 27.5 0.111
BGS-30 168 16043 4400 42 44 115 130 240 184 91 152 181 182 88 106 5 41.5 0.210
BGS-35 231 22059 3900 47 52 135 150 279 215 107 178 211 212 102 130 6 67 0.477
BGS-40 336 32086 3600 47 52 160 180 318 245 121 210 246 250 116 145 8 100 0.92
BGS-45 472 45073 3200 52 57 180 200 346 274 135 235 274 276 131 165 8 135 1.468
BGS-50 650 62070 2900 72 77 195 220 389 310 153 254 306 309 148 183 9 195 2.73
BGS-55 880 84034 2650 72 77 215 240 425 350 168 279 334 334 173 203 9 261 4.20
BGS-60 1205 115069 2450 77 82 235 260 457 384 188 305 366 366 186 228 10 316 5.70
BGS-70 1823 174084 2150 92 102 280 300 527 452 221 356 425 425 218 266 13 500 12.05
BGS-80 2639 252006 1750 95 105 285 335 590 511 249 385 485 470 249 300 13 715 21.77
BGS-90 3037 290012 1550 100 – 300 370 660 567 276 420 535 518 276 325 15 969 36.60
BGS-100 4100 391521 1450 120 – 330 405 711 626 305 470 595 572 305 355 16 1259 56.27

BVG Type Gear Coupling

Standard full flexible gear coupling type BVG accommodates angular & parallel misalignments or a combination of both as well as axial misalignment (end float). Ideal for all horizontal, close coupled applications including fans, overhead cranes, conveyors, steel & paper mill equipment. One or both of the hubs can be easily reversed for more than normal shaft separation applications.
Size kW at
100
rpm		 Rated Torque Nm Max.
rpm		 Bore ØD ØA ØB ØF G L M TL #
wt.
kg		 M.I.(WR²)
kg-m²
PB Max.
BVG -100 6 559 7600 13 35 120 50 75 3 45 54 93 4.1 0.006
BVG -101 12 1127 6730 14 50 170 65 110 5 55 67 115 10.6 0.029
BVG -102 29 2804 6150 20 65 185 85 125 5 70 83 145 15.4 0.046
BVG -103 53 5047 5200 30 80 220 105 150 5 85 103 175 26.0 0.110
BVG -104 100 9557 4580 40 100 250 130 175 5 105 124 215 40.0 0.213
BVG -105 152.94 14605 3950 46 115 290 155 200 10 110 136 230 60.0 0.445
BVG -106 235 22444 3550 50 125 320 175 230 10 125 152 260 84.0 0.745
BVG -107 412 39303 3270 60 145 350 205 260 10 140 174 290 113.4 1.21
BVG -108 529 50472 3015 70 165 380 230 290 10 155 187 320 158.0 2.04
BVG -109 658 62821 2650 80 190 430 250 330 10 165 196 340 210.0 3.46
BVG -110 963 91923 2330 100 230 490 310 390 10 180 216 370 290.0 5.55
BVG -111 1289 123065 2100 110 260 545 350 445 10 200 245 410 545.0 15.25
BVG -112 1723 164516 1940 150 300 590 400 490 10 240 289 490 716.0 24.30
BVG -113 2908 277694 1600 160 330 680 440 555 15 260 312 535 984.0 43.21
BVG -114 4019 383786 1500 200 370 730 500 610 15 280 341 575 1219.0 64.84
BVG -115 4812 459515 1400 230 410 780 540 660 15 320 385 655 1566.0 97.30
BVG -116 7028 671165 1200 260 455 900 625 755 20 350 423 720 2246.0 183.66
BVG -117 9997 954665 1100 300 520 1000 720 855 20 400 489 820 3260.0 338.05
BVG -118 13236 1263938 1000 320 620 1100 810 950 20 450 533 920 4680.0 600.41
BVG -119 17454 1666744 900 300 710 1250 910 1050 30 485 559 1000 6283.0 955.96

Advantages of the Gear Couplings

Gear couplings are mechanical devices used to connect two shafts, transmitting torque and accommodating misalignment between them. They are widely used in various industries due to their robust design and performance. Here are the key advantages of gear couplings:

  1. High Torque Transmission: Gear couplings are capable of transmitting high levels of torque, making them ideal for heavy-duty applications such as in steel mills, power plants, and industrial machinery.
  2. Accommodation of Misalignment: They can handle angular, parallel, and axial misalignment between connected shafts, reducing stress on equipment and improving operational reliability.
  3. Durability and Strength: Made from high-quality materials like steel, gear couplings are highly durable and resistant to wear, even under harsh operating conditions.
  4. Compact Design: Despite their strength, gear couplings have a relatively compact size, allowing them to fit into tight spaces in machinery layouts.
  5. Low Maintenance: Their simple design with fewer moving parts means gear couplings require minimal maintenance, reducing downtime and operational costs.
  6. Versatility: Gear couplings can be used in a wide range of applications, from high-speed machinery to low-speed, high-torque systems, making them adaptable to various industries.
  7. Shock Load Absorption: They can absorb and dampen shock loads and vibrations, protecting connected equipment from damage.
  8. High Efficiency: Gear couplings provide efficient power transmission with minimal energy loss, ensuring optimal performance of the system.

Typical Applications of Gear Couplings

Gear couplings are widely used in mechanical systems to transmit torque between two shafts that may not be perfectly aligned. Their design, which typically involves two hubs with external gear teeth and a sleeve with internal gear teeth, allows them to accommodate misalignment while delivering power efficiently. Here are some typical applications:

  • Industrial Machinery: Gear couplings are common in heavy-duty equipment like steel rolling mills, paper mills, and cement mixers. They handle high torque loads and compensate for shaft misalignment caused by thermal expansion or operational stresses.
  • Power Generation: In turbines, generators, and pumps, gear couplings connect driving and driven shafts. They're valued for their ability to transmit large amounts of power reliably, even under varying alignment conditions.
  • Automotive and Marine: They're used in drivelines of heavy vehicles or ships, where misalignment between the engine and transmission can occur due to vibration or structural flexing.
  • Mining Equipment: Crushers, conveyors, and hoists often rely on gear couplings. The rugged design withstands harsh environments and the misalignment from uneven loads or wear.
  • Oil and Gas: Pumps, compressors, and drilling rigs use gear couplings to ensure consistent torque transfer, even when shafts shift slightly due to operational pressures or foundation settling.

Common Troubleshooting of Gear Couplings

Gear couplings are widely used in mechanical systems to transmit torque between two shafts while accommodating slight misalignments. However, like any mechanical component, they can encounter issues that require troubleshooting. Here are some common problems associated with gear couplings:

  • Excessive Vibration: Gear couplings may experience excessive vibration due to misalignment between connected shafts, worn gear teeth, or improper installation. This can lead to uneven load distribution, causing noise and potential damage. Check alignment with precision tools and inspect teeth for wear.
  • Overheating: Overheating occurs when lubrication is insufficient or degraded, or if the coupling is overloaded beyond its torque capacity. Friction increases, causing heat buildup. Regularly monitor lubricant condition, ensure proper grease levels, and verify the coupling's load rating matches application demands.
  • Noise During Operation: Unusual noises, such as grinding or clanking, often indicate misalignment, inadequate lubrication, or worn components. Metal-to-metal contact from insufficient grease can amplify sound. Inspect lubrication quality, re-align shafts, and replace damaged gears if necessary to restore smooth operation.
  • Premature Wear of Gear Teeth: Gear teeth may wear out quickly due to improper lubrication, contamination in the lubricant, or excessive torque. This reduces efficiency and risks failure. Examine teeth for pitting or scoring, clean the coupling, and use high-quality, uncontaminated lubricant suited to operating conditions.
  • Lubricant Leakage: Leaks can stem from damaged seals, over-pressurization during greasing, or worn housing components. Loss of lubrication accelerates wear and failure. Inspect seals for cracks, ensure proper greasing techniques, and replace faulty parts to maintain a sealed, lubricated environment.
  • Shaft Misalignment: Misalignment—angular, parallel, or axial—strains the coupling, leading to vibration, wear, and potential breakdown. It's often caused by installation errors or foundation settling. Use dial indicators or laser alignment tools to correct shaft positioning and secure mounting bases.
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