Double Enveloping Worms and Worm Gears(Globoidal worm gearing)

GEARX brand double enveloping worms and worm gears are manufactured by unique method, compared with the normal cylindrical worms and worm gears, the double enveloping worms and worm gears has more teeth in meshing, give a better lubrication oil film, and has larger induced curvature radius. Under the same physical size, the double enveloping worms and worm gears 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%. The extra precision double enveloping worms and worm gears of all sizes can steadily reach grade 4 of DIN standard and better than Ra 0.4 of thread roughness.

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.

Main Products:

• Standard series of double enveloping worms and worm gears.
  • Center distance(inches): PDF catalog: 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.
  • Center distance(mm): PDF catalog: 100, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500;
    Transmission ratio I=10~63.
  • We can offer gearsets with standard backlash and low backlash, certified specifications for standard backlash and low backlash gearsets are available on request.
• Custom made double enveloping worms and worm gears:
  
  • Double enveloping worms and worm gears for indexing drive.
  • Maximum center distance:1200mm.

Product Feature:

• Large loading capacity under the same specification.
• Compact dimensions can be designed and manufactured.
• Higher shock load capacity.
• Greater durability and stiffness.
• Easily establishing lubrication oil film, smaller friction coefficient, higher transmission coefficient, saving energy.
  
• High precision.
  
• Smoother functioning, lower noisiness and longer service life.

Application:

The double enveloping worms and worm gears are widely used for metallurgical, petroleum chemical, light textile, architectural, wood working, mineral-dressing equipment and food machinery as well as aero-space industry etc., For example, they can be used in architectural hoist, tower cranes, elevators, escalators, passenger conveyors, wood working machines, mineral-dressing for gold, continuous casting machinery, universal machines precision indexing mining equipment, feeder breakers, shuttles, conveyors, rock crushers, heavier multi-stage gearing, roll drives, winders, slitters, roll turnover stands, turret indexers, drum hoists, winches, slab pushers, side adjusters, screwdowns, furnace tilt drives, roll drives slitters and radar equipment etc., as transmission devices for power transmitting or precision position driving.

Double enveloping worm and worm gears	Double enveloping worm and worm gears

Main Equipment:

• Worldwide-only 3 HNC35TP worm grinders equipped with 10 CNC axis and 4 simultaneously-working axis were jointly developed with Klingelnberg.
• German SNC 31 hob sharpening machine.
• German Pfauter PE800 CNC high precision hobbing machine and P900 hobbing machines.
• Computer-aided-test composite performance testing bed.
• German Liebherr L1200 hobbing machine.

Main Instrument:

• German Leitz PMM 12106 3-D measuring machine.
• German Klingelnberg PSE 600 single-flank contact rolling testing machine and PSR 500 composite testing machines.

Quality Control:

• Composite transmission errors check report.
• Stress analysis by using photoelastic technology.
• Stress-strain theoretic analysis on teeth of worm and worm gear under the meshing state by means of 3-D finite element method.
• Unusual wear when failure happens(Spectrum of worn particle based on ferrography analysis).
• Usual worn particle(Spectrum of worn particle based on ferrography analysis).

World-class theory and technology. excellent equipment and measuring instrument as scientific are the assurances of high quality of products.

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