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An Extensive Comparison: Helical Gearbox vs Worm Gearbox

Nov 20, 2023 | Worm Gearbox Knowledge

Understanding the Basics: Worm Gearboxes and Electric Motors

When it comes to transmitting motion and power, worm gearboxes and electric motors share a symbiotic relationship. A worm gearbox is a unique type of gear system that adjusts the rotational movement and direction to deliver high torque. Motor, on the other hand, provides the necessary rotational energy. The worm gear (screw) meshes with a worm wheel (similar to a spur gear), and the alignment of these equipments allows the motor to drive the worm gear. As the worm turns, it drives the worm wheel, converting high-speed, low-torque input from the motor into low-speed, high-torque output. This makes worm gearboxes perfect for heavy-duty machinery and applications requiring substantial speed reduction and torque multiplication.

Diving Deeper: Helical Gearbox vs Worm Gearbox

Working Principle & Structure

A helical gearbox utilizes helical gears for power transmission. The teeth on helical gears are cut at angles, allowing for more gradual and smooth engagement. This results in quiet operation and a reduction in wear and tear. On the other hand, a worm gearbox operates through a worm (screw) that meshes with a worm gear (wheel). The sliding action between the worm and gear offers quiet and smooth operation, but it also results in heat generation and lower efficiency.

Efficiency & Torque

In terms of efficiency, helical gearboxes generally surpass worm gearboxes. The helical gearbox’s efficiency ranges from 94% to 98%, while the worm gearbox’s efficiency varies widely, from 50% to 90%, depending on the gear ratio. This lower efficiency is due to the sliding action of the worm gear, which generates more heat and reduces performance. However, worm gearboxes typically deliver higher torque than helical gearboxes, making them more ideal for heavy-duty applications.


Backdrivability refers to the ability to reverse the operation, driving the output shaft to turn the input shaft. Worm gearboxes, especially those with a high gear ratio, are generally non-backdrivable, providing an inherent braking system. Helical gearboxes, in contrast, are usually backdrivable.

Cost & Maintenance

Helical gearboxes tend to be more expensive than worm gearboxes due to their complexity and the higher precision required for manufacturing. However, they generally require less maintenance and are more durable, offering a better long-term return on investment.

Choosing Xinlan: Quality, Price, and Exceptional Service

Worm Gear Reducer

At Xinlan, we pride ourselves on providing top-notch gearboxes, including both helical and worm gearboxes. Our products are manufactured with precision, ensuring high performance and durability. We offer competitive pricing without compromising quality, making us a reliable choice for your gearbox needs.

Our technical team is always ready to assist you with any inquiries or issues, promising a response within 24 hours. We are dedicated to providing excellent customer service and ensuring your satisfaction.

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Act Now: Invest in Xinlan Gearboxes

Don’t compromise on quality and efficiency. Choose Xinlan gearboxes for superior performance and excellent customer support. Contact us today to find the perfect solution for your gearbox needs.

As one of leading manufacturers, suppliers and exporters of worm gearbox, planetary gearbox, helical gearbox, cycloidal gearbox and many other gear speed reducer. We also supply geared motor, electric motor, synchronous motor, servo motor and other size motors.

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