YOU WILL WANT TO to Use Worm Gears
There is one especially glaring reason why one would not select a worm gear more than a typical gear: lubrication. The movement between your worm and the wheel equipment faces is completely sliding. There is absolutely no rolling component to the tooth contact or interaction. This makes them relatively difficult to lubricate.
The lubricants required are usually high viscosity (ISO 320 and higher) and therefore are difficult to filter, and the lubricants required are usually specialized in what they perform, requiring something to be on-site particularly for that kind of equipment.
Worm Gear Lubrication
The main problem with a worm gear is how it transfers power. It is a boon and a curse at the same time. The spiral motion allows huge amounts of decrease in a comparatively little bit of space for what’s required if a standard helical gear were used.
This spiral motion also causes an incredibly problematic condition to be the principal mode of power transfer. That is commonly known as sliding friction or sliding put on.
With a typical gear set the power is transferred at the peak load stage on the tooth (referred to as the apex or pitchline), at least in a rolling wear condition. Sliding happens on either side of the apex, but the velocity is relatively low.
With a worm gear, sliding motion is the only transfer of power. As the worm slides across the tooth of the wheel, it gradually rubs off the lubricant film, until there is absolutely no lubricant film still left, and as a result, the worm rubs at the steel of the wheel in a boundary lubrication regime. When the worm surface area leaves the wheel surface area, it picks up more lubricant, and starts the procedure over again on the next revolution.
The rolling friction on an average gear tooth requires small in the way of lubricant film to fill in the spaces and separate both components. Because sliding happens on either side of the apparatus tooth apex, a slightly higher viscosity of lubricant than is definitely strictly needed for rolling wear is required to overcome that load. The sliding takes place at a comparatively low velocity.
The worm on a worm set gear turns, and while turning, it crushes against the strain that’s imposed on the wheel. The only way to avoid the worm from touching the wheel is to get a film thickness huge enough to not have the entire tooth surface wiped off before that portion of the worm is out of the load zone.
This scenario takes a special kind of lubricant. Not just will it should be a comparatively high viscosity lubricant (and the bigger the strain or temperature, the higher the viscosity should be), it will need to have some way to greatly help overcome the sliding condition present.
Read The Right Method to Lubricate Worm Gears to find out more on this topic.
Custom Worm Gears
Worm Gears are correct angle drives providing large acceleration ratios on comparatively brief center distances from 1/4” to 11”. When correctly installed and lubricated they function as the quietist and smoothest operating type of gearing. Because of the high ratios possible with worm gearing, maximum speed reduction can be accomplished in less space than many other types of gearing. Worm and worm gears are powered by nonintersecting shafts at 90° angles.
EFFICIENCY of worm equipment drives depends to a big degree on the helix angle of the worm. Multiple thread worms and gears with higher helix angle prove 25% to 50% better than single thread worms. The mesh or engagement of worms with worm gears creates a sliding action leading to considerable friction and greater loss of efficiency beyond other styles of gearing. The use of hardened and ground worm swith bronze worm gears boosts efficiency.
LUBRICATION can be 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 improves as the effectiveness of the gearing increases. Proper lubrication enhances effectiveness by reducing friction and heat.
RATIOS of worm gear sets are dependant on dividing the number of teeth in the gear by the number of threads. Thus solitary threads yield higher ratios than multiple threads. All Ever-Power. worm gear models are available with either remaining or right hands threads. Ever-Power. worm equipment sets can be found with Single, Dual, Triple and Qua-druple Threads.
SAFETY PROVISION: Worm gearing shouldn’t be used since a locking mechanism to carry large weights where reversing action can cause harm or damage. In applications where potential damage is non-existent and self-locking is preferred against backward rotation after that use of a single thread worm with a minimal helix angle instantly locks the worm equipment drive against backward rotation.
Materials recommended for worms can be hardened steel and bronze for worm gears. Nevertheless, depending on the application worm drive shaft unhardened steel worms operate adequately and more economically with cast iron worm gears at 50% horsepower ratings. In addition to steel and hardenedsteel, worms are available in stainless, aluminum, bronze and nylon; worm gears can be found in steel, hardened metal, stainless, light weight aluminum, nylon and nonmetallic (phenolic).
Ever-Power also sells gear tooth measuring devices called Ever-Power! Gear Gages reduce mistakes, save money and time when identifying and purchasing gears. These pitch templates can be found in nine sets to recognize all the regular pitch sizes: Diametral Pitch “DP”, Circular Pitch “CP”, Exterior Involute Splines, Metric Module “MOD”, Stub Tooth, Great Pitches, Coarse Pitches and Uncommon Pitches. Refer to the section on Equipment GAGES for catalog numbers when ordering.
YOU WILL WANT TO to Use Worm Gears