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Worm Gear Has A Self-locking Function
Aug 14, 2017

Worm gear box due to its structural constraints, in the operation of the gear wear will be higher than the gear box gear wear. The worm as a major component, when the process is not properly and the quality of the material problems prone to failure. And whether the process is good and whether it has advanced production equipment and scientific management have a certain relationship in the choice of processing technology, depending on the different parameters may be different. But not every manufacturer will use the best production process to produce, in the industry is very subdivided today, usually focus on a product of the production of a product technology will be better grasp, and the equipment more complete. So the choice of product manufacturers need to carefully consider the time.

Worm tooth hardness greater than 45HRC, core hardness is not greater than 30HRC. The original heat treatment process using 20Cr steel after carburizing salt furnace quenching. After analysis found that: the hardness of the surface of the worm meet the technical requirements, but the core hardness is high, it is clear that the carburization of carbon has spread to the core, so that the core hardness of high toughness insufficient internal stress increases, Resulting in cracks and fracture tendencies of the root causes; and we believe that after 20Cr carburizing salt furnace quenching this two-step heat treatment production costs are relatively high and deformation, quenching deformation often need to add a straightening process, the production cycle and The cost is further improved.

Worm gear reducer structural features:

Can get a large transmission ratio than the staggered shaft helical gear mechanism compact

Two rounds of intermeshing between the tooth surface contact, the carrying capacity is much higher than the staggered shaft helical gear mechanism

Worm drive is equivalent to the screw drive, multi-tooth meshing drive, so the transmission is smooth, the noise is very small

With self-locking. When the lead angle of the worm is less than the equivalent friction angle between the meshing teeth, the mechanism has self-locking, can achieve reverse self-locking, that is, only by the worm to drive the worm, and can not be driven by the worm gear. Such as in the heavy machinery used in the self-locking worm mechanism, the reverse self-locking can play a security role

Transmission efficiency is low, wear more serious. When the worm gear is engaged, the relative sliding speed between the meshing teeth is large, so the friction loss is large and the efficiency is low. On the other hand, the relative sliding speed of the tooth surface wear serious, serious heat, in order to heat and reduce wear and tear, often use the price is more expensive friction and wear resistance of the better materials and good lubrication device, and thus higher cost , The worm axial force is larger.

Application of self-locking function of worm gear reducer:

In the reducer transmission mode, the worm gear with other gear drive has no characteristics, that is, the worm can easily rotate the worm, but the worm can not turn the worm. This is because the structure and transmission of the worm gear is achieved by friction.

Worm gear drive mode with self-locking function in the mechanical application is very useful, such as hoist, conveyor equipment and so on. But also because of the worm gear friction transmission, but also caused the transmission efficiency of the worm gear relative to the gear drive is much lower.

Not all of the worm gear reducer has a good self-locking function, the worm's self-locking function to achieve a certain speed ratio can be achieved. This is related to the lead angle, that is, the speed ratio of the worm gear self-locking function is not so ideal.