plastic worm gear

The manufacturing methods of worms are roughly divided among cutting, heat treated and ground after cutting and rolling. And for worm wheels, they may be approximately divided among cutting teeth, cutting tooth after casting, and teeth cutting after the exterior rim is usually cast around the guts of the blank.

As for the products for worm gears, for worms: structural carbon steel (S45C, etc.), structural alloy metal (SCM415, etc.), stainless and cast iron will be utilized; and for worm tires: cast iron (FC200, etc.), nonferrous metals such as phosphor bronze and specialized bronze (nickel bronze, lightweight aluminum bronze, etc.), engineering plastics such as MC Nylon, etc. As the combination of materials for worms and worm wheels impacts the allowable transmission drive and lubrication strategies, the decision of mating products requires careful consideration. Also, linked to the friction of tooth, a harder materials for worm than worm wheel is generally used.

Ordinarily the business lead angles of the proper and left tooth surface of a worm are the same. Yet, in duplex worm gears, they are made to ensure that the tooth thickness of the worm alterations continuously in the axial path to ensure that by shifting the worm axially with shims, it turns into possible to change the backlash.

If a worm equipment is used, a large speed decrease can be plastic worm gear obtained in a compact space compared to using spur gears. Generally, the worm is employed to carefully turn the worm wheel. But when the lead position is particularly small, the worm wheel can not turn the worm and it is called its self locking characteristic. This can be used effectively in a few applications but it can’t be called perfect preventative for reverse driving. (When the business lead angle is usually large, it is possible to convert the worm with the worm wheel.) In addition, there are many advantages to worm gears such as for example low noises and vibration, but due to the huge sliding at the tooth floors (sliding contact), the effectiveness is certainly low. (For cylindrical worm gears, the general efficiency is approximately 30-90%.) Also, there are cons such as they tend to suffer from tooth surface warmth seizure.