Home > Product Information > Harmonic Drive > FD Series Differential Gear

| Features | Models & Symbols | Specification | Product drawing | The differential unit FD series is an extremely compact differential unit that allows you to fine-tune the phase and timing during operation by applying the unique operating principle of Harmonic Drive®. The FD series consist of four parts like the pancake-type component unit. The unit type is cased so that the gear and pulley for transmission can be directly installed in it. • As the differential mechanism is put together as one,it is easily installed in the equipment. • It consists of only four parts and is coaxially put together. • As the backlash is very small,the unit requires no assembly adjustment at all,which helps reduce the assembly cost significantly • As it has very large reduction ration between the adjusting shaft and the output,it allows highly accurate and minute position adjustment easily and requires little torque for adjusting the shaft. <Rotational direction and reduction ratio> The rotational direction is the same as the FB. The section describes how to uses the unit as differential unit. (R indicates the reduction ratio value in the ratings table.) Type: FD series Size: 14, 20, 25, 32, 40, 50, 65, 80, 100 Reduction ratio:  78, 80, 88, 96, 100, 104, 110, 120, 128, 131, 132, 157, 158, 160, 194, 200, 208, 242, 258, 260, 320 Models and symbols: • 0 = Unit type • 2 = Component type Specification: G= New type •Usage example •Example of assembly •Difference between the differential gear and the Harmonic differential •Example of design •Gear selection data •Example of calculation Rotational speed r/min 3500 2850 1750 1450 1150 960 870 750 600 500 Size Reduction ratio N·m N·m N·m N·m N·m N·m N·m N·m N·m N·m 20 80 29 30 30 30 30 30 30 30 30 30 100 30 31 36 36 36 36 36 36 36 36 128 31 34 42 43 43 43 43 43 43 43 160 32 35 42 45 48 49 49 49 49 49 25 80 46 50 57 57 57 57 57 57 57 57 100 49 53 67 67 79 79 79 79 79 79 120 52 55 70 70 80 82 89 91 96 96 160 54 57 71 73 80 83 89 92 98 108 200 55 59 71 74 80 84 89 92 98 108 32 78 98 108 108 108 108 108 108 108 108 108 100 108 118 137 147 157 157 157 157 157 157 131 108 118 137 157 167 176 176 196 206 206 157 108 118 137 157 167 176 176 196 206 216 200 108 118 137 157 167 176 176 196 206 216 260 108 118 137 157 167 176 176 196 206 216 40 80 196 196 196 196 196 196 196 196 196 196 100 235 245 265 265 265 265 265 265 265 265 128 235 245 294 314 343 363 372 372 372 372 160 235 245 294 314 343 363 372 392 421 451 200 235 245 294 314 343 363 372 392 421 451 258 235 245 294 314 343 363 372 392 421 451 50 80 353 353 353 353 353 353 353 353 353 353 100 441 470 549 559 559 559 559 559 559 559 120 441 470 549 588 637 666 666 666 666 666 160 441 470 549 588 637 676 696 754 794 843 200 441 470 549 588 637 676 696 754 794 843 242 441 470 549 588 637 676 696 754 794 843 65 78 - - 764 764 764 764 764 764 764 764 104 - - 1030 1100 1180 1190 1190 1190 1190 1190 132 - - 1030 1100 1180 1250 1290 1380 1460 1570 158 - - 1030 1100 1180 1250 1290 1380 1460 1570 208 - - 1030 1100 1180 1250 1290 1380 1460 1570 260 - - 1030 1100 1180 1250 1290 1380 1460 1570 80 80 - - 1370 1370 1370 1370 1370 1370 1370 1370 96 - - 1800 1800 1800 1800 1800 1800 1800 1800 128 - - 2040 2180 2340 2490 2570 2710 2710 2710 160 - - 2040 2180 2340 2490 2570 2740 2950 3130 194 - - 2040 2180 2340 2490 2570 2740 2950 3130 258 - - 2040 2180 2340 2490 2570 2740 2950 3130 320 - - 2040 2180 2340 2490 2570 2740 2950 3130 100 80 - - 2470 2470 2470 2470 2470 2740 2470 2470 100 - - 3720 3720 3720 3720 3720 3720 3720 3720 120 - - 3720 3980 4280 4560 4710 4740 4740 4740 160 - - 3720 3980 4280 4560 4710 5010 5390 5720 200 - - 3720 3980 4280 4560 4710 5010 5390 5720 242 - - 3720 3980 4280 4560 4710 5010 5390 5720 320 - - 3720 3980 4280 4560 4710 5010 5390 5720 Unit type (FD-0) (Unit:mm) Symbol /Size 20 25 32 40 50 65 øA 85 95 120 145 185 235 øB(h7) 52 65 85 100 125 140 øC 20 30 40 50 60 70 D 73 81 95 113 132 147 Mass(kg) 2.0 2.6 5.0 8.3 17 34 Symbol /Size 80 100 - - - - øA 290 360 - - - - øB(h7) 180 210 - - - - øC 90 110 - - - - D 178 212 - - - - Mass(kg) 59 118 - - - - Component type (FD-2) (Unit:mm) Symbol /Size 20 25 32 40 50 65 øA(g7) 70 85 110 135 170 215 B 12 14 18 21 26 35 C 1 1 1 1 1 1 D 25 29 37 43 53 71 Mass(kg) 0.6 1.0 2.0 3.6 7.2 14 Symbol /Size 80 100 - - - - øA(g7) 265 330 - - - - B 41 50 - - - - C 1 1 - - - - D 83 101 - - - - Mass(kg) 26 48 - - - - Please confirm dimensions and specification with the drawing issued by Harmonic Drive Systems. | Features | Models & Symbols | Specification | Product drawing |