Harmonic Drive LLC | 42 Dunham Ridge, Beverly, MA 01915 | 800-921-3332
Harmonic Drive and Harmonic Planetary are registered trademarks of Harmonic Drive.

Series Size Ratio Type
FB 50 100 2-GR

FB component set consists of four elements:

  • Wave generator, an elliptical bearing assembly
  • Flexspline, a non-rigid ring with external teeth
  • Circular Spline, rigid internal gear
  • Dynamic Spline, rigid internal gear

How it works

Rotation of the Wave Generator imparts a rotating elliptical shape to the Flexspline causing progressive engagement of its external teeth with the internal teeth of the Circular Spline and the Dynamic Spline. The fixed Circular Spline has two more teeth than the Flexspline, thereby imparting relative rotation to the Flexspline at a reduction ratio corresponding to the difference in the number of teeth. With the same number of teeth, the Dynamic Spline rotates with and at the same speed as the Flexspline.

Gear Model Number
Gear Dimensions (see drawing)
Flange Dim A - Motor Adapter Flange Bore Dia. {{foundMotor.flangeDimA}} mm
Flange Dim B - Motor Adapter Flange Bore Depth {{foundMotor.flangeDimB}} mm
Motor Dim C - Motor Bolt Circle Dia. {{foundMotor.dimC}} mm
Flange Dim D - Bolt Size {{foundMotor.flangeDimD}}
Coupling Dim F - Motor Coupling Bore Dia. {{foundMotor.couplingDimF}} mm
Mass kg
Gear Performance Data
Rated Torque L10 284 Nm
Limit for Average Torque 253 Nm
Limit for Repeated Peak Torque 253 Nm
Limit for Momentary Peak Torque 627 Nm
Backdriving Torque Nm
Ave. Input Speed 1,700 rpm
Gear Backlash < 3 arc min
Mass 2.9 kg


Contact Us

Submit a Question


Call: 978-532-1800

Hours 8:00am - 5:00pm EST
Monday through Friday