Дом > Блог > Общая проблема > Design of constant force springs

Design of constant force springs

источник:Цянь Точность время:2022-9-14
 A constant force spring is a spring that exerts a constant force over its range of motion. That is, it does not obey Hooke’s law. Typically, a constant force spring is constructed as a coiled band of spring steel so that the spring relaxes when fully coiled. When it is unrolled, the restoring force comes mainly from the portion of the belt that is close to the roll. Since the geometry of this region remains nearly constant as the spring unfolds, the resultant force is nearly constant.
      By creating a spring with a variable pitch, you can make a push-shape spring with a constant velocity. Placing a larger pitch in a larger outer diameter coil and a smaller pitch in a smaller outer diameter coil will force the single spring to fold all coils at the same rate when compressed.
      Design of Constant Force Springs: A constant force spring is a coil of prestressed tape that exerts a nearly constant restraining force against unwinding (Figures 1 and 2). The force is constant because the change in the radius of curvature is constant. This is the case if the change in coil diameter due to buildup is not taken into account. Long reach, constant torque and virtually no friction have led many designers to specify constant force springs in applications such as sliding doors and windows and height adjustment of computer monitors and fans, store display shelves or motor carbon brush motors . Constant force motor springs are also used to drive mechanisms for timers, movie cameras and cable retractors.

      Tension type constant force tension springs are supplied in coils with a natural radius of curvature R (Fig. 3). If such a spring is installed on the drum, the drum diameter should be 10% to 20% larger than its natural diameter. There should be one and a half turns on the reel. The active portion of the material is approximately equal to 1.25 times the diameter D. Therefore, the spring will not reach its rated load until the elongation is greater than 1.25D (Figure 1). The radius of curvature of the active part goes from R to infinity and a clearance is required. The recommended distance from the center of the drum to the straight section is 0.8 times the diameter D (Figure 3). Strips can become unstable when stretched for extended periods of time and should be guided to prevent twisting or kinking during recoil. The diameter of the idler must be larger than the natural diameter and must not be used to reverse the natural radius of curvature (Figure 4).

Depending on your application, a constant force spring may be ideal. Consultation with the spring manufacturer for constant force springs is recommended at the design stage. Qianye Precision specializes in the production and manufacture of high-precision clockwork springs, which are widely used in various electronic devices, household appliances, small toys, office supplies, communication equipment, medical machinery, electronic computers, windows, doors, vehicles, etc. The imported raw materials and domestic raw materials will continue to meet your requirements. The company has more than 20 years of experience in product development, production and manufacturing, and has become a well-known brand distributor in China.

Последние новости

 What Are the Diverse Applications of Spiral Torsion Springs in Various Industries?
What Are the Diverse Applications of Spiral Torsion Springs in Various Industries?

Time:2023-8-4

Spiral torsion springs are a type of mechanical springs that exert torque when twisted. They are widely used in various industries due to their unique properties and capabilities. In this article, we will explore the applications of spiral torsion springs and their significance in different fields. One of the primary applications of spiral torsion springs is in the automotive industry....

 Constant force spring responsible for pushing nails in a nail gun
Constant force spring responsible for pushing nails in a nail gun

Время:2022-9-14

At present, the nail gun is frequently used in the construction industry or wood industry. The nail gun is a commonly used hand-held tool with a wide variety of types. According to the power source nail gun can be divided into pneumatic and electric two categories. When users are working, they often need to change different tools in their hands....

 Understanding the Mechanics of Constant Force Springs
Understanding the Mechanics of Constant Force Springs

Time:2023-4-19

Constant force springs are mechanical devices that are designed to exert a constant force throughout their entire range of motion. These springs are used in a wide variety of applications, from small electronic devices to large industrial machinery. Understanding the mechanics of constant force springs is essential for engineers and designers who want to incorporate them into their designs. The...

 Window Constant Force Spring: The Ultimate Solution for Smooth and Reliable Window Operation
Window Constant Force Spring: The Ultimate Solution for Smooth and Reliable Window Operation

Time:2023-6-23

Windows are an essential component of any building, providing natural light, fresh air, and security. However, opening and closing windows can sometimes be a challenge, especially for those with limited mobility or strength. This is where constant force springs come in handy, providing a reliable and smooth operating solution for windows. A constant force spring is an extension spring that...

 Enhance Your Curtains with Stylish Springs!
Enhance Your Curtains with Stylish Springs!

Time:2023-10-14

Curtains are an essential part of any home decor. They not only serve the purpose of providing privacy and blocking out sunlight but also add a touch of style and elegance to the room. If you are looking to enhance the look of your curtains, why not consider adding stylish springs? In this article, we will explore the various ways...

 Exploring the Corrosion Resistance of Spring Steel
Exploring the Corrosion Resistance of Spring Steel

Time:2023-8-18

Introduction Corrosion is a natural process that occurs when metals react with their environment. It is a significant concern in various industries due to the potential structural damage and financial losses it can cause. Spring steel, a commonly used material in manufacturing, is not exempt from this phenomenon. This article aims to explore the corrosion resistance of spring steel and...

Product
 Услуги по сборке и монтажу
Услуги по сборке и монтажу
Компания Qianye не только обеспечивает производство прецизионных пружин, но также уделяет особое внимание конструктивным и функциональным решениям всей пружинной системы и может предоставить полный...
 Пружина постоянной силы
Пружина постоянной силы
Характеристика: Пружины постоянной силы (постоянной силы) прокатаны полосами из нержавеющей стали. Полосы из высокопрочной стали формируются на специальном производственном пружинном оборудовании. Когда внешняя сила выпрямляет их,...
 Услуга оптимизации дизайна
Услуга оптимизации дизайна
From product ideas, design to finished product manufacturing, we can assist customers in completing them, and help customers optimize their products from the professional perspective of spring use, speed up...
 Силовая пружина
Силовая пружина
Характеристика: Силовая пружина намотана стальной полосой. Пружинная коробка необходима для ограничения ее внешнего диаметра. Центр пружины соединен с валом. Когда...
 Пружина постоянного кручения
Пружина постоянного кручения
Характеристика: Пружина фиксированного (постоянного) крутящего момента (пружина) изготовлена из нержавеющей стали. Внешняя сила перематывает боевую пружину из ее естественного состояния в выходное колесо (накопление энергии). Когда...
 Пружина угольной щетки
Пружина угольной щетки
Характеристика: 1. Благодаря постоянному усилию, независимо от длины угольной щетки и коллектора, давление остается одинаковым. 2. Пружина постоянной силы уменьшает угольную щетку...