Home > Blog > Corporate news > Power Springs: Principles, Applications, and Design Points

Power Springs: Principles, Applications, and Design Points

source:Qianye Precision time:2024-5-30

Power springs, as a device for storing and releasing torque, work by precisely winding strip material around a mandrel and then embedding it in a specific housing or fixed ring. This design allows power springs to effectively store energy and release it in the form of torque when needed.

1. Wide Application of Power Springs

Power springs play a key role in many applications that require torque output. From common watches and toys to seat belt pretensioners, canister vacuum cleaners, and even dog leashes and badge reels, power springs provide these products with long-lasting power through their unique performance.

2. Design Points: Inner Diameter of Housing and Spring Material

When designing a power spring, the inner diameter of the housing is an important consideration. It determines the amount of space the spring material can occupy, which in turn affects the number of coils and performance of the spring. Typically, the spring material should occupy 40% to 50% of the housing space to maximize space utilization. This ensures that the spring has enough room to move during winding and unwinding, while avoiding excessive compression that causes performance degradation.

3. Box Width and Spring Design

When designing a power spring, box width is a critical parameter. This value is directly related to the maximum width of the spring steel, which affects the overall performance of the spring. Knowing the box width helps us to accurately calculate the space that the spring can occupy, ensuring that the effectiveness of the spring is maximized within the limited space.

4. Spring Box Height and Material Utilization

When considering the width of the box, we also need to pay attention to the height of the spring box. Although the spring box does not usually need to occupy all of the available space, knowing the overall size of the box can help us determine how to use the spring material most effectively. Once the design has been determined, we can recommend the most appropriate spring size and type based on the size of the shell to achieve the best performance.

5. The Importance of Mandrel Size

As the core component of the power spring, the size of the mandrel has a significant impact on the performance of the spring. The mandrel is located in the center of the housing, and the inner part of the spring is connected to it. The diameter of the mandrel not only determines the spatial arrangement inside the case, but also affects the number of available coils and the overall size of the spring.

6.Maximum Torque and Hysteresis

When discussing the performance of power springs, maximum torque is a key parameter. Torque is not the tension on the cable as we usually think of it, but the rotational force generated by the spring when it is uncoiled. The size of this force directly affects the size of the load the spring can drive or operate.

It should be noted, however, that power springs experience hysteresis due to the presence of friction. This means that the torque required to wind the spring is often greater than the torque required to unwind the spring. Therefore, this hysteresis effect must be taken into account in the design to ensure that the spring is stable and reliable in practical applications.

7.Torque variation characteristics

The torque of power springs is not uniform. The torque increases rapidly in the first few turns and the last few turns of the spring. In order to fully utilize the performance of the spring and avoid excessive stress, it is usually recommended to keep the first 20% of the turns available and the last 20% inactive when designing the spring. This means that in practical applications, we will only use the middle 60% of the turns of the spring to drive the load, thus ensuring the stability and reliability of the spring.

8.Life Cycle Considerations

The service life of a power spring refers to the number of complete winding and unwinding cycles that it can withstand. In general, the life of a power spring rarely exceeds 200,000 cycles, and in some applications where space and torque are optimized, it may be less than 100,000 cycles. However, it should be noted that this life is not absolute and is affected by many factors such as frequency of use, load size, environmental conditions, etc.

Therefore, when designing a power spring, we must set reasonable service life targets based on the requirements of the actual application. At the same time, by selecting suitable materials, optimizing design parameters and taking appropriate maintenance measures, the service life of the power spring can be extended and its reliability improved.

Latest News

 Introducing the Versatile Retractable Constant Force Spring
Introducing the Versatile Retractable Constant Force Spring


Constant force springs have been widely used in various industries, providing a constant force throughout their entire extension and retraction cycle. These springs are known for their versatility and reliability, and now there is a new addition to the family - the retractable constant force spring. In this article, we will explore the features and benefits of this innovative product....

 Customized Springs: Tailoring to Your Specific Needs
Customized Springs: Tailoring to Your Specific Needs


Springs are essential components of many products and machines, serving as elastic connectors designed to store and release energy. They come in different shapes and sizes, each suited to specific applications and environments. However, not all springs are created equal, and when a standard spring does not meet your requirements, a customized spring might be the answer. Customized springs are...

 Revolutionize Your Product with Our Optimization Design Service
Revolutionize Your Product with Our Optimization Design Service


In today's fast-paced and highly competitive business world, it's crucial to stay ahead of the curve and continuously improve your products to stay relevant and meet the ever-changing needs of your customers. At our optimization design service, we understand the importance of innovation and optimization, and we're here to help you revolutionize your product and take your business to the...

 Application of power spring in electric vehicle charging station
Application of power spring in electric vehicle charging station


As the times change, gas stations are gradually replaced by electric vehicle charging stations. We have always been a natural partner for designers and manufacturers of electric vehicle charging stations, because they need to be compact, clean and provide trouble free cable management solutions for their electric vehicle charging stations around the world.   By applying our power spring to the retractable cable...

 Custom Springs: Enhancing Medical Devices for Improved Healthcare
Custom Springs: Enhancing Medical Devices for Improved Healthcare


In the world of medical devices, precision and reliability are of utmost importance. These devices are designed to improve the quality of healthcare and save lives. One crucial component that plays a significant role in the functionality of these devices is custom springs. Custom springs are specially designed springs that are tailored to meet the specific needs of medical devices....

 What are the mechanics and applications of high cycle torsion springs?
What are the mechanics and applications of high cycle torsion springs?


Introduction: High cycle torsion springs are mechanical devices that store and release energy by twisting or rotating. They are widely used in various industries for their ability to withstand repeated cycles without experiencing fatigue failure. In this article, we will explore the mechanics behind high cycle torsion springs and their applications. Mechanics of High Cycle Torsion Springs: A high cycle...