Worm Drive Gear Set

Characteristics of worm gear drive 

1. Large transmission ratio and compact structure. 

2. Stable transmission without noise. 

3. Self locking. 

4. Low transmission efficiency and serious wear. 

5. The axial force of the worm is large, resulting in large bearing friction loss. 

Advantages of worm gear drive 

1. Because the structure is more compact than the staggered shaft helical gear mechanism, a large transmission ratio between spatial staggered shafts can be realized. 

2. The contact mode of worm drive is different from other types of reducer. It is line contact, low noise and stable transmission. 

3. When the lead angle g of the worm is very small, the transmission has self-locking, that is, the worm can only drive the worm wheel, but the worm wheel can not drive the worm, so it is often used in lifting or other occasions requiring self-locking.

The two shafts of the worm gear drive cross each other and are perpendicular to each other; Worm can be regarded as a helix with one tooth or several teeth along the cylinder. The worm gear is like a bevel gear, but its teeth cover the worm gear. When engaging, the worm rotates to drive the worm gear to rotate one tooth or several teeth, so the worm gear transmission speed ratio i=the number of worm heads/the number of worm gear teeth.

Function relative to gear transmission:

advantage:

1. In addition to its wide application, it also solves the problem that the gear reduction ratio should not be too large.

2. Work smoothly without noise.

3. The worm gear can obtain accurate and small rotation, so the worm gear drive is often used for indexing.

4. It can be self-locking. When the rising angle of the worm helix is less than 3-6 degrees, the transmission energy of the worm gear is self-locking.

Disadvantages: the efficiency is low, generally 0.7-0.9. When the deceleration ratio is large, the efficiency is even lower than 0.5.

Due to high heating, good cooling and lubrication conditions are required during operation. When transmitting working power at a higher speed, worm gears are often made of expensive non-ferrous metals.

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