Harmonic Drive LLC | 247 Lynnfield St. Peabody, MA 01960 | 800-921-3332
Harmonic Drive and Harmonic Planetary are registered trademarks of Harmonic Drive LLC.


Series Size Ratio Type
FB 40 100 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 157 Nm
Limit for Average Torque 186 Nm
Limit for Repeated Peak Torque 186 Nm
Limit for Momentary Peak Torque 343 Nm
Backdriving Torque Nm
Ave. Input Speed 2,000 rpm
Gear Backlash < 3 arc min
Mass 1.8 kg

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