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 motion between the worm and the wheel gear faces is completely sliding. There is absolutely no rolling component to the tooth get in touch with or conversation. This makes them relatively difficult to lubricate.
The lubricants required are often high viscosity (ISO 320 and higher) and thus are hard to filter, and the lubricants required are typically specialized in what they do, requiring a product to be on-site specifically 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 simultaneously. The spiral motion worm drive shaft allows huge amounts of reduction in a comparatively little bit of space for what is required if a typical helical equipment were used.
This spiral motion also causes a remarkably problematic condition to be the primary mode of power transfer. That is often called sliding friction or sliding put on.
With an average gear set the energy is transferred at the peak load point on the tooth (known as the apex or pitchline), at least in a rolling wear condition. Sliding occurs on either side of the apex, however the velocity is fairly low.
With a worm gear, sliding motion is the only transfer of power. As the worm slides over the tooth of the wheel, it slowly rubs off the lubricant film, until there is absolutely no lubricant film 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, it picks up more lubricant, and begins 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 the two components. Because sliding happens on either part of the apparatus tooth apex, a slightly higher viscosity of lubricant than is strictly necessary for rolling wear is required to overcome that load. The sliding takes place at a relatively low velocity.
The worm on a worm set gear turns, even though turning, it crushes against the strain that is imposed on the wheel. The only way to prevent the worm from touching the wheel is certainly to get a film thickness huge enough never to have the whole tooth surface area wiped off before that section of the worm has gone 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 load or temperature, the bigger the viscosity must be), it will need to have some way to greatly help conquer the sliding condition present.
Read The Right Way to Lubricate Worm Gears for more information on this topic.
Custom Worm Gears
Worm Gears are correct angle drives providing huge speed ratios on comparatively brief center distances from 1/4” to 11”. When correctly installed and lubricated they function as the quietist and smoothest working type of gearing. Because of the high ratios possible with worm gearing, optimum speed reduction can be accomplished in much less space than many other types of gearing. Worm and worm gears are powered by non-intersecting shafts at 90° angles.
EFFICIENCY of worm equipment drives depends to a sizable 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 produces a sliding action causing considerable friction and greater lack of efficiency beyond other styles of gearing. The usage of hardened and ground worm swith bronze worm gears raises efficiency.
LUBRICATION can be an essential factor to boost effectiveness in worm gearing. Worm gear action generates considerable warmth, decreasing efficiency. The quantity of power transmitted at a given temperature boosts as the effectiveness of the gearing raises. Proper lubrication enhances performance by reducing friction and heat.
RATIOS of worm gear sets are determined by dividing the number of teeth in the apparatus by the amount of threads. Thus one threads yield higher ratios than multiple threads. All Ever-Power. worm gear units can be found with either remaining or right hands threads. Ever-Power. worm gear sets are offered with Single, Dual, Triple and Qua-druple Threads.
Security PROVISION: Worm gearing shouldn’t be used because a locking mechanism to hold large weights where reversing actions can cause harm or damage. In applications where potential damage is non-existent and self-locking is desired against backward rotation after that use of a single thread worm with a minimal helix angle instantly locks the worm gear drive against backward rotation.
Materials recommended for worms is definitely hardened steel and bronze for worm gears. However, depending on the application form unhardened steel worms operate adequately and more economically with cast iron worm gears at 50% horsepower ratings. Furthermore to metal and hardenedsteel, worms are available in stainless, light weight aluminum, bronze and nylon; worm gears are available in steel, hardened metal, stainless, aluminum, nylon and non-metallic (phenolic).
Ever-Power also sells equipment tooth measuring devices called Ever-Power! Gear Gages decrease mistakes, save time and money when identifying and purchasing gears. These pitch templates can be found in nine sets to recognize all the standard pitch sizes: Diametral Pitch “DP”, Circular Pitch “CP”, Exterior Involute Splines, Metric Module “MOD”, Stub Tooth, Good Pitches, Coarse Pitches and Uncommon Pitches. Refer to the section on Equipment GAGES for catalog figures when ordering.