Helical gear reducer efficiency

　　Whether you’re using a worm gear, a helical gear, or any type of industrial gear, these components are essential to many industrial motors and machinery, helping to increase torque output and change the direction of rotation. Worm gears and helical gears are two of the most common types of industrial gears—but how do these widely used gear forms differ? In this blog post, we’ll examine the key distinctions between worm gears and helical gears.

　　 Definition of a worm gear and worm shaft

　　A worm gear is a gear mechanism in which a worm (or screw) meshes with a gear. Thanks to its unique design, it allows users to regulate speed and can also be used to increase torque.

　　Furthermore, this concept implies that the worm can drive the gear, but the gear cannot turn the worm or transmit motion to it. Worm gears are commonly used in high-speed gear reduction applications. They are also frequently employed in conveyor systems and other applications where a locking mechanism serves as a brake. In addition, they are often utilized in precision instruments, elevators, and gate mechanisms.

　　If you are using a worm gear and wish to enhance the efficiency of your industrial facility, you should analyze the differences between worm gears and helical gears to reduce stress on the industrial gear system.

　　 Advantages of worm gears and worm shafts

　　A worm gear gearbox is a compact device that, despite its typically small size, offers high power capacity. Thanks to its ease of design and manufacture and its minimal number of components, it delivers precise linear motion and can be used in a wide range of applications. Like helical gearboxes, worm gearboxes operate completely silently, further enhancing their versatility. They require virtually no maintenance, making them cost‑effective.

　　One of the primary advantages of worm gearboxes is their ability to achieve high‑speed reduction with minimal backlash. Thanks to their low gear ratio, they can significantly reduce backlash during deceleration.

　　Furthermore, it can also be used to design irreversible actuators—systems that can operate in only one direction. Another intriguing aspect of these gearboxes is their irreversibility.

　　 What are the main improvements of a worm gear gearbox?

　　The main drawback of worm gearboxes is their poor efficiency; due to associated axial stresses and excessive friction, efficiency can drop as low as 15%.

　　Furthermore, the most severe wear in these instruments occurs on the friction‑prone surfaces; therefore, they must be highly robust and thoroughly calibrated to ensure a long service life. In fact, if this area experiences increased friction, some wear issues may arise at the rounded corners.

　　 Helical Gear Definition

　　Due to their helical tooth engagement, helical gears operate more smoothly and quietly than many other types of gears, particularly worm gears and spur gears. The teeth on these gears are inclined relative to the gear face. As the teeth begin to mesh, contact occurs gradually. The helix angle of helical gears typically ranges from 15 to 30 degrees.

　　Helical gears are the most commonly used gear type in transmissions. They can also generate substantial axial thrust, which is borne by bearings.

　　 Advantages of Helical Gears

　　Compared with worm gears or spur gears, helical gears operate at a slower speed, resulting in quieter and smoother gear performance.

　　Due to the greater number of teeth in contact, helical gears have a longer service life and are particularly well suited for high-load applications.

　　The load is always evenly distributed across multiple shafts, thereby reducing wear.  

　　They can transmit power and motion between parallel axes and right-angle axes.

　　Disadvantages of helical gears

　　One of the main drawbacks of these gears is the thrust force generated by the gear shafts, which must be accommodated by appropriate thrust bearings.

　　Helical gears generate axial thrust due to tooth engagement, which generates heat, reduces production efficiency, increases energy waste, and lowers overall efficiency.

　　Significant sliding friction exists between the teeth of helical gears, which leads to accelerated wear and necessitates a lubrication system throughout the entire operating cycle.

　　Their manufacturing cost is higher than that of worm gears.