(Last Updated On: December 13, 2023)

It is inherently difficult to tighten and remove large-sized bolts at sites where industrial production lacks power sources. In particular, bolts with larger diameters need to be tightened and disassembled with a torque value, and the emergence of the torque multiplier solves this problem. So in this article, TorcStark will introduce in detail the working principle, characteristics, usage steps, usage precautions, etc. of the torque multiplier. Hope this helps you know more about torque amplifiers.

How a torque multiplier works

A torque multiplier is a mechanical device that converts input torque into greater output torque. It usually consists of three main parts: input shaft, output shaft and planetary gear.

Let’s take a look at the input shaft. The input shaft is usually connected by a handle or electric motor, and when the input shaft rotates, it transfers torque to the planetary gears.

Next is the planetary gear. The planetary gear consists of a sun gear (sun gear) and multiple planetary gears surrounding the sun gear. The input shaft is connected to the sun gear, while the output shaft is connected to the planet gears. Planetary gears realize torque conversion through gear transmission.

In planetary gears, the gear ratio between the sun gear and the planet gears is key. Typically, the sun gear has one more tooth than the planet gear. This design allows the sun gear to rotate only once per revolution of the planet gear. In this way, the rotational speed of the input shaft can be amplified, thereby doubling the torque.

As the input shaft rotates, the sun gear transfers torque to the planet gears. Due to the gear ratio of the planetary gears to the sun gear, the output shaft will rotate slower than the input shaft, but the output shaft will have greater torque than the input shaft.

This is how a torque multiplier works.

In addition to the basic structure mentioned above, the torque multiplier also includes some auxiliary components, such as friction plates and clutches. The function of these components is to control the working mode and output torque of the torque multiplier.

The friction plate is located between the planet gear and the housing. The torque multiplier is in low torque mode when the friction plate is in contact with the housing. In this mode, the torque of the output shaft is smaller, which is suitable for work scenarios that require lower torque.

The clutch is located between the input shaft and the sun gear. The torque multiplier is in high torque mode when the clutch connects the input shaft to the sun gear. In this mode, the torque of the output shaft is larger, which is suitable for work scenarios that require higher torque.

The internal principles and structure of the torque multiplier make it play an important role in many applications. For example, in automotive repair, a torque multiplier can be used to remove or install fasteners because it provides more torque to overcome the resistance of the fastener. In addition, the torque multiplier can also be used in assembly work on industrial production lines to improve work efficiency.

A torque multiplier is a mechanical device that converts input torque into greater output torque. Its working principle is based on planetary gear transmission, which doubles torque through reasonable gear ratios. Torque multipliers are used in many fields and are a very important tool.

Features and advantages of torque multiplier

A high-energy planetary transmission mechanism is used as the main drive, with a compact structure and a large transmission ratio. It can produce a large output torque with a small input force. The reaction arm can be rotated 360°, making it reliable and durable. The operator only needs to apply a small force to get 1-28 times the output torque. The torque wrench presets the torque according to the transmission ratio multiple. When the corresponding pre-tightening torque is reached, it will emit a “click” mechanical signal sound, accompanied by an obvious vibration feeling, and can easily complete the tightening and disassembly of bolts and nuts.

1. Compact structure, reliable and durable.
2. Precision planetary gear torque-increasing system with high torque-increasing accuracy.
3. Equipped with the anti-rotation device to improve operation convenience and safety.
4. Combined with a manual torque wrench, precise assembly of bolts and nuts can be easily achieved.
5. By operating the reversing lever and button, clockwise or counterclockwise switching can be easily achieved.

Correct operating procedures for torque multipliers

1. Preparation:

Check the appearance and components of the torque multiplier to ensure there is no damage or wear.

Have the necessary tools ready, such as wrenches, bolts, nuts, etc.

2. Select the appropriate output tool:

According to the size and shape of the tightening object, select the appropriate output tool, such as an open-end wrench, a torx wrench, a socket, etc.

3. Connect the input and output components:

Connect the input end of the torque multiplier to a power source (such as an electric wrench, manual wrench, etc.).

Connect the output of the torque multiplier to the output tool.

4. Set the torque value:

According to the tightening requirements of the bolt or nut, the appropriate torque value is set through the adjustment mechanism on the torque multiplier.

5. Operate input devices:

Smoothly operate the input device, such as an electric wrench or manual wrench, so that the torque multiplier outputs torque according to the set torque value.

6. Observe the output:

Pay close attention to the tightening of the tool at the output end. When you hear a “click” sound or other prompts, it means that the set torque value has been reached.

7. Stop the operation:

When the set torque value is reached, immediately stop operating the input device to avoid excessive force.

8. Disassembly tools:

After completing the tightening task, disassemble the input and output parts in sequence and split the torque multiplier into two parts.

9. Cleaning and maintenance:

Clean the outer surface of the torque multiplier to avoid dirt and moisture residue.

Regularly check the wear of components and replace seriously worn components on time.

10. Storage:

Store the torque multiplier in a dry, ventilated place away from direct sunlight and high temperatures to ensure it works properly.

Please note:
When using a torque multiplier, follow safe operating procedures to ensure the personal safety of yourself and others. In actual operation, it needs to be flexibly adjusted according to specific circumstances to meet the needs of different scenarios.

Precautions for using torque multiplier

1. Pay attention to the torque value of the matching torque wrench and do not overload it.
2. Try to keep the torque wrench drive head, multiplier and locked object coaxially aligned.
3. Try to keep the reaction arm in reliable plane contact with the resistor.
4. Try to keep the reaction force and reaction arm at right angles.
5. The reaction force point should be as far away from the multiplier as possible and within the safety triangle area.
6. For safety reasons, the use of double arms or balanced reaction arms is not allowed.
7. To remove the multiplier, first remove the torque wrench and toggle the anti-kickback device.


The above is the detailed content about the working principle, characteristics, usage steps, and usage precautions of the torque multiplier. As a bolt solution service provider with 20 years of experience, TorcStark looks forward to cooperating with you.