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

HPG, HPGP & HPF Series


Continuous Backlash Compensation

Harmonic Drive's expertise in the field of elasto-mechanics of metals is applied to the internal gear of the HPG, HPGP and HPF Series to provide the gearhead with continuous backlash compensation.

Planetary gears have simultaneous meshing between the sun gear and planet gears and between the planet gears and the internal gear. Some manufacturers try to reduce the backlash of the gearhead  by controlling the dimensional precision of the parts, however this causes interference of meshing parts due to dimensional errors, resulting in uneven input torque and noise. The backlash increases over time as gear wear takes place due to this interference.

A special design of the HPG, HPGP and HPF internal gear allows a preload of the gear (on the order of microns)  and enables it to slightly deform elastically thus maintaining low backlash for the life of the gearhead, without any need for adjustment. This preload not only minimizes backlash but also compensates for interference between meshing parts. The result is low backlash for the life of the gear, without any "backlash creep".













Gearhead Construction and Easy Motor Mounting with our Quick Connect® Coupling

Easily connect your servomotor to our HPG or HPGP gearheads with our Quick Connect coupling. 

  • Low Backlash: Less than 3 arc-min (Less than 1 arc-min also available)
  • Gear Ratios, 3:1 to 50:1
  • High Efficiency
  • High Load Capacity by integrating the output flange and cross roller bearing
  • High-Torque Capacity

Contact us if you have any questions or would like more information. We love to talk about our technology, and welcome your call or email.


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