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Constant Torque Spring price: A Mechanical Solution for Consistent Torque Output

source:Qianye Precision time:2023-9-7


In various mechanical systems, maintaining a consistent torque output is crucial for ensuring optimal performance and efficiency. One ingenious solution to this challenge is the constant torque spring, a mechanical device capable of delivering a uniform torque throughout its range of motion. In this article, we will explore the working principles, applications, advantages, and limitations of constant torque springs.

Working Principles:

A constant torque spring operates on the fundamental principle of torque generation through the storage and release of potential energy. It consists of a tightly wound coil, typically made of spring steel, with a pre-determined torque characteristic. The spring is designed in such a way that its torque output remains constant regardless of the angle of rotation or extension.

When the constant torque spring is wound or compressed, potential energy is stored in the coil. As the spring begins to unwind or extend, this potential energy is gradually released, converting into mechanical energy and providing a consistent torque output. The torque output can be adjusted by changing the spring\’s physical characteristics, such as the wire diameter, coil pitch, or number of active coils.


Constant torque springs find applications in a wide range of industries and mechanical systems. One significant application is in retractable cord reels, commonly used in vacuum cleaners, power tools, and industrial machinery. The constant torque spring ensures that the cord is retracted at a controlled speed and exerts a consistent force on the user, improving usability and safety.

Another important application is in counterbalancing mechanisms, such as overhead doors or adjustable hospital beds. By utilizing a constant torque spring, these mechanisms can be easily adjusted and held securely at any desired position, while still offering a smooth and controlled movement.


The use of constant torque springs offers several advantages compared to other torque delivery mechanisms. Firstly, they provide a uniform torque output throughout their range of motion, ensuring consistent performance and eliminating the need for complex control systems.

Secondly, constant torque springs are highly reliable and require minimal maintenance. Unlike electric or pneumatic systems, they do not rely on external power sources or complex control algorithms, reducing the chances of failure or malfunction.

Furthermore, constant torque springs are compact and can be easily integrated into existing mechanical systems. Their design flexibility allows for customization according to specific torque requirements, making them suitable for various applications and environments.

Constant Torsion Spring


While constant torque springs offer numerous benefits, they also have some limitations that need to be considered. One limitation is their limited range of torque output. Once the torque requirement exceeds the design limits of the spring, the torque output becomes non-constant, affecting the overall system performance.

Additionally, constant torque springs may lose some torque output over time due to material fatigue. However, this can be mitigated by using high-quality materials and periodic inspections to identify any signs of wear or fatigue.


Constant torque springs provide an ingenious mechanical solution for maintaining a consistent torque output in various mechanical systems. Their ability to deliver uniform torque throughout their range of motion makes them ideal for applications where consistent performance is crucial.

From retractable cord reels to counterbalancing mechanisms, constant torque springs offer advantages such as reliability, simplicity, and compactness. However, their limited torque range and potential for material fatigue should be taken into consideration during design and implementation.

Constant torque springs offer a reliable and efficient solution to achieve consistent torque output, enhancing the performance and functionality of mechanical systems across different industries.

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