Worm Gears are right angle drives providing large velocity ratios on comparatively short center distances from 1/4” to 11”. When correctly installed and lubricated they function as quietist and smoothest operating type of gearing. Because of the high ratios possible with worm gearing, optimum speed reduction can be accomplished in less space than many other types of gearing.
EFFICIENCY of worm equipment drives depends to a large degree on the helix angle of the worm. Multiple thread worms and gears with higher helix position prove 25% to 50% more efficient than one thread worms. The mesh or engagement of worms with worm gears creates a sliding action causing considerable friction and better loss of efficiency beyond other types of gearing. The use of hardened and floor worm swith bronze worm gears Nylon Gear Rack china increases efficiency.
LUBRICATION is an essential factor to improve effectiveness in worm gearing. Worm gear action generates considerable high temperature, decreasing efficiency. The amount of power transmitted at confirmed temperature boosts as the effectiveness of the gearing improves. Proper lubrication enhances efficiency by reducing friction and warmth.
RATIOS of worm equipment sets are dependant on dividing the amount of teeth in the gear by the number of threads. Thus one threads yield higher ratios than multiple threads.
Protection PROVISION: Worm gearing should not be used since a locking mechanism to carry heavy weights where reversing actions can cause harm or damage. In applications where potential damage is nonexistent and self-locking is preferred against backward rotation then use of a single thread worm with a low helix angle immediately locks the worm gear drive against backward rotation.
MATERIAL recommended for worms is definitely hardened steel and bronze for worm gears. Nevertheless, depending on the application form unhardened steel worms operate adequately and more economically with cast iron worm gears at 50% horsepower ratings. Furthermore to steel and hardenedsteel, worms are available in stainless, light weight aluminum, bronze and nylon; worm gears are available in steel, hardened steel, stainless, light weight aluminum, nylon and non-metallic (phenolic).
Gear racks are used to convert rotating motion into linear movement. A gear rack has straight tooth cut into one surface of a square or round portion of rod and operates with a pinion, which is certainly a small cylindrical gear meshing with the apparatus rack. Generally, equipment rack and pinion are collectively known as “rack and pinion”. There are many ways to use gears.

There are applications where in fact the gear rack is stationary, as the pinion traverses and others where the pinion rotates on a fixed axis while the gear rack moves. The previous is used widely in conveying systems while the latter can be used in extrusion systems and lifting/lowering applications.