A worm gear assembly resembles a single threaded screw that turns a modified spur gear with slightly angled and curved teeth. Worm Gear reduction motors may be fitted with either a right-, left-hand, or hollow output (drive) shaft. This correct angle gearing kind is utilized when a sizable speed reduction or perhaps a big torque improve is needed inside a restricted quantity of space. Figure 1 shows a single thread (or single begin) worm along with a forty tooth worm gear resulting inside a 40:1 ratio. The ratio is equal towards the quantity of gear teeth divided by the amount of starts/threads around the worm. A comparable spur gear set having a ratio of 40:1 would need a minimum of two stages of gearing. Worm gears can attain ratios of much more than 300:1.
Worm gears have an inherent design advantage over other gear sets; the worm can easily turn the dc worm gear motor, but the gear cannot turn the worm. In lifting applications, this feature acts as a secondary brake due to limited back drivability.
Worms can be made with multiple threads/starts as shown in Figure 2. The pitch of the thread remains constant while the lead of the thread increases. In these examples, the ratios relate to 40:1, 20:1, and 13.333:1 respectively.
Worm gear sets can be self-locking: the worm can drive the gear, but due to the inherent friction the gear cannot turn (back-drive) the worm. Typically only in ratios above 30:1. This self-locking action is reduced with wear, and should never be used as the primary braking mechanism of the application.
27RPM DC24V 2.45NM 25kg.cm Turbo Worm Gear Motor GW31ZY DIY Robot
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3.Use for labeling machines, remote control curtains, automatic voltage electricity, grills, ovens, washing machines, garbage disposal machines, household appliances, slot machines, the banknote recognition, automatic actuator, coffee machine, towel disposal, lighting, etc.
4.Low speed structure,high power,large output torque,stable performance,small installation space and self lock,etc.
5.This type is low speed Worm Gear DC Motor,self locking.
6.Widely used in various of occasions that require special install size.
The worm gear is usually bronze and the worm is steel, or hardened steel. The bronze component is designed to wear out before the worm because it is easier to replace.
The hoist motor can transmit motion through the gear reducer, but the load cannot transmit motion back through the gear reducer.
Regulates the lowering speed of the load
The load will not be allowed to free fall
OSHA [1910.179] recognizes this as an approved means of controlled braking
In an industry where ‘load brakes’ and ‘regenerative braking’ are widely accepted, Electrolift offers the better option by using a worm drive gearbox as the secondary braking function.
The main advantages of Electrolift’s non-load brake worm drive gear reducer:
Constant load on the load block. Load brake hoists are prohibited from doing this because it does not allow the load brake to release causing overheating and premature failure.
Long lifts – Long lifts cause load brakes to overheat and prematurely fail
Faster lifting speeds – Load brakes accumulate excessive heat as lifting speeds increase.
Inherently safe – Worm drives do not need controls or high maintenance mechanisms to ensure safe lifts.
Low Maintenance – Less moving parts than gearboxes that require complex load brake mechanisms