domov > Blog > Pogosta težava > Design of constant force springs

Design of constant force springs

vir:Natančnost Qianye čas: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.

Zadnje novice

 Constant Force Torsion Spring: A Reliable Mechanism for Consistent Torque
Constant Force Torsion Spring: A Reliable Mechanism for Consistent Torque

Time:2023-12-24

In the world of mechanical engineering, the importance of reliable and consistent torque cannot be overstated. Many applications, ranging from automotive systems to industrial machinery, rely on precise and consistent torque to ensure optimal performance and safety. One mechanism that has proven to be highly effective in providing consistent torque is the constant force torsion spring. This article will explore...

 Variable Force Springs: A Versatile Solution for Your Engineering Needs
Variable Force Springs: A Versatile Solution for Your Engineering Needs

Time:2023-5-6

Variable force springs are an important component in many engineering applications. They are used to provide a constant force over a range of motion, making them ideal for a wide variety of applications. Variable force springs are highly versatile and can be used in many different industries and applications. In this article, we will discuss variable force springs, their advantages,...

 Do you know what springs are used as stop mechanisms?
Do you know what springs are used as stop mechanisms?

Čas: 2022-9-14

We often find that the spring we make is wrongly used as a stop mechanism in the design. This design defect can occur in all types of springs, including constant force spring, constant torque spring and power spring. For example, consider a simple cable extension product in which the spring retracts the cable into the housing. If the spring is completely...

 Are Constant Pressure Springs the Future of Consistent Force in Mechanical Systems?
Are Constant Pressure Springs the Future of Consistent Force in Mechanical Systems?

Time:2023-8-12

Springs are mechanical devices that store and release energy, making them indispensable in various industries and applications. One particular type of spring that has been gaining attention in recent years is the constant pressure spring. This article aims to delve into the mechanics of constant pressure springs, explaining their structure, working principles, and applications. Constant pressure springs, also known as...

 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...

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

Time:2023-12-22

Spring steel is a type of high-carbon steel that is known for its excellent elasticity and resilience properties. It is widely used in various industries, including automotive, manufacturing, and construction, due to its ability to withstand repeated heavy loads and resist deformation. However, one of the major concerns with spring steel is its susceptibility to corrosion, which can significantly affect...

Product