YOU WILL WANT TO to Use Worm Gears
There is one especially glaring reason one would not select a worm gear over a standard gear: lubrication. The motion between your worm and the wheel gear faces is completely sliding. There is no rolling element of the tooth contact or conversation. This makes them fairly difficult to lubricate.
The lubricants required are often high viscosity (ISO 320 and higher) and therefore are challenging to filter, and the lubricants required are typically specialized in what they perform, requiring a product to be on-site specifically for that type of equipment.
Worm Gear Lubrication
The main problem with a worm gear is how it transfers power. It really is a boon and a curse simultaneously. The spiral motion allows huge amounts of reduction in a comparatively little bit of space for what is required if a typical helical gear were used.
This spiral motion also causes a remarkably problematic condition to be the principal mode of power transfer. This is commonly known as sliding friction or sliding wear.
With an average gear set the energy 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 takes place on either part of the apex, but 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 still left, and for that reason, the worm rubs at the steel of the wheel in a boundary lubrication regime. When the worm surface leaves the wheel surface area, it picks up more lubricant, and begins the procedure over again on another revolution.
The rolling friction on a typical gear tooth requires small in the form of lubricant film to complete the spaces and separate the two components. Because sliding takes place on either aspect of the apparatus tooth apex, a slightly higher viscosity of lubricant than is certainly strictly needed for rolling wear must 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’s imposed on the wheel. The only way to avoid the worm from touching the wheel is certainly to get a film thickness large enough never to have the entire tooth surface area wiped off before that section of the worm is out of the load zone.
This scenario takes a special sort of lubricant. Not just will it will have to be a relatively high viscosity lubricant (and the bigger the strain or temperature, the bigger the viscosity must 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 right angle drives providing huge speed ratios on comparatively short center distances from 1/4” to 11”. When properly mounted and lubricated they function as quietist and smoothest worm drive shaft working type of gearing. Due to the high ratios possible with worm gearing, optimum speed reduction could be accomplished in less space than many other types of gearing. Worm and worm gears operate on nonintersecting shafts at 90° angles.
EFFICIENCY of worm gear 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 solitary thread worms. The mesh or engagement of worms with worm gears creates a sliding action causing considerable friction and greater lack of efficiency beyond other styles of gearing. The use of hardened and surface worm swith bronze worm gears boosts efficiency.
LUBRICATION is an essential factor to boost 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 improves. Proper lubrication enhances efficiency by reducing friction and heat.
RATIOS of worm gear sets are determined by dividing the amount of teeth in the gear by the amount of threads. Thus solitary threads yield higher ratios than multiple threads. All Ever-Power. worm gear units can be found with either still left or right hand threads. Ever-Power. worm equipment sets are offered with Single, Dual, Triple and Qua-druple Threads.
SAFETY PROVISION: Worm gearing shouldn’t be used because a locking mechanism to carry heavy weights where reversing actions could cause harm or damage. In applications where potential damage is non-existent and self-locking is desired 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 can be hardened steel and bronze for worm gears. However, depending on the application 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, light weight aluminum, bronze and nylon; worm gears are available in steel, hardened metal, stainless, aluminium, nylon and non-metallic (phenolic).
Ever-Power also sells gear tooth measuring gadgets called Ever-Power! Gear Gages reduce mistakes, save time and money when identifying and purchasing gears. These pitch templates can be found in nine sets to identify all the standard pitch sizes: Diametral Pitch “DP”, Circular Pitch “CP”, Exterior Involute Splines, Metric Module “MOD”, Stub Tooth, Great Pitches, Coarse Pitches and Unusual Pitches. Make reference to the section on Equipment GAGES for catalog figures when ordering.
worm drive shaft
YOU WILL WANT TO to Use Worm Gears