Double Enveloping Worm Gears



Double enveloping worm gear set mounted with axes at a 90 degree angle. This type of gearing is also called Globoidal worm gearing, but the term double enveloping is more commonly used worldwide recently.

Double enveloping worm gearsets are manufactured by unique method, compared with the normal cylindrical worm gearsets, the double enveloping worm gearsets has more teeth in meshing, and has one more group of lines of contact, so the total load is divided among more individual gear teeth, and the load is further divided where teeth support two lines of contact, this superior load distribution greatly increases load carrying capacity. Under the same physical size, the double enveloping worm gearing can endure higher load about 1.5 to 3 times higher than the cylindrical ones. With the same transmission power, its center distance can be reduced up to 20 to 40%.

Large Loading Capacity

  • There are more teeth in continuous meshing
  • There are two instantaneous lines of contact, so the length of contact line is longer
  • Under the same specification, compact dimension can be designed under the same transmitted power and the same transmission ratio

High Transmission Efficiency

  • Easily establishing lubrication oil film
  • Smaller friction coefficient
  • Smoother functioning
  • Lower noisiness
  • Longer service life
  • Saving energy


  • Worm tooth can be ground
  • Tooth surface hardness is higher ( HRC≥55 )
  • Tooth surface roughness is lower ( Ra≤0.8 )
  • Tooth accuracy grade is higher
  • Standard series of double enveloping worm gearsets
  • Center distance (inch): 0.8, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, 7.0, 8.0, 10.0, 12.0, 15.0,18.0, 21.837,  24.0, 28.0
  • Transmission ratio I=5~70
  • Custom made double enveloping worm gearsets
  • Minimum center distance: 20 mm / 0.8 inch
  • Maximum center distance: 1200 mm / 48 inch


  • Robot joints
  • UGV
  • Power wheelchairs
  • Elderly scooters
  • Scooters for disabled people
  • Electric windows and doors
  • Medical instruments
  • Booster pump used on cars
  • Car pedals
  • Wind turbine tower hoists
  • Power tools for food machinery industry
  • Radar antennas
  • Screw-down  mechabism

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