Home > Blog > Industry information > Designing a Constant Force Torsion Spring: A Guide to Engineering in English

Designing a Constant Force Torsion Spring: A Guide to Engineering in English

source:Qianye Precision time:2023-7-4


Torsion springs are essential components commonly used in various industries. These springs are designed to exert a rotational force when twisted, making them ideal for applications that require torque or rotational energy. This guide aims to provide a comprehensive overview of designing a constant force torsion spring, highlighting the key engineering principles involved.

1. Understanding Torsion Springs:

Before delving into the design process, it is crucial to understand the fundamental characteristics of torsion springs. These springs store mechanical energy when twisted, which is released when the torque is removed. The amount of torque exerted depends on the spring’s physical properties, such as the wire size, material, and coil dimensions.

2. Identifying Design Parameters:

To design an efficient constant force torsion spring, several parameters need to be considered. These include the desired torque, maximum deflection angle, operating temperature, and the required number of cycles. Additionally, factors like space limitations, material availability, and cost constraints should be taken into account.

3. Selecting the Material:

Choosing the appropriate material for the torsion spring is crucial for its performance and longevity. Common materials used for torsion springs include high-carbon steels, stainless steels, and various alloys. Each material has its own unique properties, such as strength, corrosion resistance, and fatigue life, which should align with the specific application requirements.

4. Determining Wire Size and Coil Dimensions:

The wire size and coil dimensions significantly affect the torque and deflection characteristics of the torsion spring. The wire diameter should be carefully calculated based on the desired torque and the spring’s material properties. The number of coils and their helix angle also play a vital role in determining the overall performance.

5. Calculating the Spring Rate:

The spring rate defines the relationship between the applied torque and the resulting angular deflection. It is calculated by dividing the torque by the angular deflection. The spring rate should be carefully determined to ensure the desired constant force throughout the spring’s operational range.




6. Analyzing Stress and Fatigue Life:

Torsion springs are subjected to repeated cycles of twisting, which can lead to fatigue failure if not properly designed. Stress analysis should be performed to ensure that the maximum stress levels are within the material’s allowable limits. Additionally, factors like stress concentration, surface finish, and shot peening can be considered to enhance the spring’s fatigue life.

7. Prototyping and Testing:

Once the torsion spring design is finalized, it is essential to prototype and test the spring to validate its performance. Prototyping allows for any necessary adjustments or improvements to be made before full-scale production. Testing involves subjecting the spring to the desired torque and measuring its deflection, stress levels, and fatigue life.


Designing a constant force torsion spring involves a meticulous engineering process, considering various parameters and materials. By understanding the principles outlined in this guide, engineers can ensure the optimal design and performance of torsion springs for their specific applications. Properly designed torsion springs can effectively and reliably transmit rotational force in countless industries, contributing to the advancement of technology and engineering.

Latest News

 Maximizing Efficiency: Expert Optimization Design Services
Maximizing Efficiency: Expert Optimization Design Services


In today's fast-paced and competitive business environment, maximizing efficiency is crucial to success. One of the most effective ways to achieve this is through optimization design services. Optimization design services involve the use of advanced tools and techniques to improve the performance of systems, processes, and products. Optimization design services can be applied to a wide range of industries and...

 Enhancing Quality through Forced Solutions
Enhancing Quality through Forced Solutions


Introduction: Organizations continuously strive to improve their performance and deliver high-quality products or services. To achieve this, they often resort to implementing forced solutions, which refer to the utilization of strict measures or policies to enhance quality. While forced solutions may have negative connotations, they can be effective in driving improvement and ensuring consistency. This article aims to explore various...

 Variable Force Spring: The Ultimate Solution for Tension Control
Variable Force Spring: The Ultimate Solution for Tension Control


Tension control is a critical aspect in many industrial and commercial applications. The ability to control tension is important in ensuring consistent and reliable performance of machinery and equipment. While there are several methods for tension control, one of the most effective and efficient solutions is through the use of variable force springs. Variable force springs are innovative tension control...

 Small but Mighty: The Power of Miniature Torsion Springs
Small but Mighty: The Power of Miniature Torsion Springs


Torsion springs are an essential component in many devices, from clocks to door hinges. These springs work by exerting a rotational force, or torque, when twisted. They are commonly used to provide a restoring force or to store and release energy in a variety of mechanical systems. Miniature torsion springs, as the name suggests, are small springs used in compact...

 Variable force spring – shelf delay push system which is effective to prevent theft from retail store.
Variable force spring – shelf delay push system which is effective to prevent theft from retail store.


Theft of small items in retail stores is a problem that occurs. An easy safe method of theft prevention is to introduce a time delay between the dispensing of multiple products. If there is a considerable delay between the dispensing of individual products, then thieves are less likely to steal the products. A shelf delay propeller equipped with variable force springs...

 Constant Force Linear Spring: Understanding its Properties and Applications
Constant Force Linear Spring: Understanding its Properties and Applications


A constant force linear spring is a type of spring that provides a constant force over its entire deflection range. This type of spring is commonly used in various applications where a constant force is required, such as in medical devices, automotive engines, and aerospace systems. In this article, we will explore the properties and applications of constant force linear...