How a torque multiplier works

The torque multiplier is an essential tool for professionals working with the assembly and disassembly of heavy machinery, pressure vessels, and other complex industrial structures.

What is a torque multiplier?

This device provides a significant mechanical advantage by making it easier to tighten and loosen bolts and nuts with much less effort. With a small application of force, a torque multiplier generates a much higher torque output, making bolt tightening operations more efficient and safer.

What is it used for?

The torque multiplier is used to increase output torque. A larger gear that receives the applied force transmits motion to a smaller gear. If the driving gear has three times the diameter of the driven gear, one full rotation of the larger gear will result in three rotations of the smaller gear. This illustrates how the gear system multiplies rotational motion and increases the torque output.

How does torque work?

Torque is the ability of a force to cause rotational motion around an axis. This physical quantity is measured in units such as kilogram-force meter (kgf.m) or Newton meter (Nm) and is directly related to the applied force and the distance from the point of application to the axis of rotation.

Torque is calculated as the vector product of the applied force and the distance to the axis of rotation. This means that whenever a force is applied at a certain distance from the rotation axis of a body, that force generates torque that tends to rotate the body. If the body is not rotating or is rotating at a constant angular velocity, it is in rotational equilibrium, meaning that the resultant of all acting torques is zero.

A practical example of how torque works can be observed when tightening a bolt with a wrench. The force applied at the end of the wrench, far from where the bolt is fixed, generates torque that makes the bolt rotate. The greater the force or the longer the distance from the application point to the rotation axis, the greater the generated torque.

Industrial applications of the torque multiplier

Industries such as petrochemical, steel, construction, hydropower plants, and nuclear facilities use torque multipliers to maximize operational efficiency. The tool allows operators to handle it practically, without the need to apply great forces, increasing productivity. It also ensures greater safety by replacing riskier methods, such as the use of long extension bars, minimizing the risk of accidents during heavy-duty fastening operations.

Torque multiplier vs. speed increaser

A torque multiplier increases the force applied to bolts, nuts, and other components, making the tightening or loosening process easier. It provides significant mechanical advantage by converting a small application of force into a much higher torque output. This is particularly useful in situations where high torque is required but space or manual force is limited.

On the other hand, a speed increaser increases the rotational speed of a shaft. This type of gearbox is commonly used in systems where the initial rotational speed is low but needs to be increased to meet operational requirements, such as in power generation systems.