Home > Blog > Industry information > Design of Constant Force Spring in Spool Damper

Design of Constant Force Spring in Spool Damper

source:Qianye Precision time:2022-9-14

 When powered by a damped constant force spring mounted on the spool, there are several key principles that influence the design of linear motion applications. These principles support robust and consistent performance of products in a variety of applications, including automotive and aircraft interiors, industrial machine components, and many other user interface applications.

The example components shown above will be cited as examples of the various design principles detailed below. This example assembly has a sliding drawer (shown in red) powered by a constant force spring mounted on a spool (spool in green; constant force spring shown in yellow) running within a mounting base (shown in grey), such as a central Console a car. A ratchet or door latch mechanism (not shown) can be implemented to allow the tray to be locked in place with a single press by the user. This example is a typical set of applications used in the automotive industry.

       1. Preload spring

       When a constant force spring is in its free state, it does not exert any force. As the spring stretches, the spring force rapidly increases from zero to nominal load. However, to avoid including this “accelerated” part of the work envelope, the design can use preloading. An example of preloading is shown in the figure below. Note that although the mechanism is retracted, the depicted spring is extended.
       To include preload in the design, ensure that the spring extends a distance equal to the outer diameter of the coil during assembly in order to engage the mounting feature. Therefore, at the beginning of the operating range, the spring has extended far enough to reach the rated load. Note that the picker does not affect the preload length.

        2. Spool – install constant force spring

        The ideal fitting for a constant force spring on the spool should be tight enough to prevent the spring ring from sliding or spinning on the spool diameter. To ensure a good fit, Qianye Precision usually recommends increasing the spool diameter by 12%. For example, if the nominal spring ID is 1.00″, a 1.12″ spool diameter is recommended.

        Spool design also affects ease of assembly. The simplest design for assembly purposes is a plain cylindrical spool with a hole through the shaft for the shaft. The exclusion of flanges, although sometimes not feasible, allows for faster and simpler assembly.

       When dealing with the physical enclosure of the components inside the system, be sure to leave enough room for the natural movement of the springs. Not having enough space to limit this movement can result in noise and excessive friction within the system. In cases where the thickness and length combine to form a larger outer diameter (outer diameter), the outer diameter can be used in place of the inner diameter to ensure sufficient space.

       3. Constant force spring

Qianye Precision provides standard and customized options to meet the various needs of customers. The image below shows two types of constant force springs from the many options we offer.

       Constant force springs can apply a variety of design features to meet space constraints, optimize assembly motion, and effectively reduce part count, thereby reducing material and labor costs. These can be applied along with other principles to achieve assembly designs that meet requirements and exceed expectations.
       Shenzhen Qianye Precision Metal Co., Ltd. is designed for customer-specific applications. Using professional technology to meet your specified requirements, we sincerely recommend that customers obtain consulting services from our R&D engineers in the early stage of product introduction and development. Design, develop, and sample products according to your needs, so that your products can find the best solution to meet your application needs.

Latest News

 Optimization Design Service: Maximizing Efficiency and Performance
Optimization Design Service: Maximizing Efficiency and Performance

Time:2023-4-26

Optimization design is a crucial aspect of product development and engineering. It involves designing and planning a product or system to maximize its efficiency, performance, and usability. Optimization design service providers offer a range of solutions to help companies enhance their product development process and achieve better results. The primary goal of optimization design is to identify areas of inefficiency,...

 China Properties of Spring Steel
China Properties of Spring Steel

Time:2023-8-7

Spring steel is a versatile and highly elastic material that is widely used in various industries. It is known for its unique properties, which make it suitable for applications requiring high strength, durability, and resilience. In this article, we will explore the properties of spring steel and its applications. 1. High Elasticity: One of the most significant properties of spring...

 Spiral Spring Applications: Unveiling its Versatility in Various Industries
Spiral Spring Applications: Unveiling its Versatility in Various Industries

Time:2023-9-4

Introduction One such type is the spiral spring, which is known for its versatility and wide range of uses. From automotive to aerospace industries, spiral springs find their place in different machinery, ensuring smooth operation and functionality. This article aims to explore the applications of spiral springs in various industries and shed light on their significance in modern-day manufacturing processes....

 Electric Fan Lifting Spring: A Convenient Mechanism for Adjusting Fan Height
Electric Fan Lifting Spring: A Convenient Mechanism for Adjusting Fan Height

Time:2023-4-27

Electric fans have become a staple appliance in many households, offices, and other indoor spaces. They provide relief on hot days by circulating air and creating a cool breeze. However, not all fans are created equal. Some fans are designed to be mounted on walls or ceilings, while others are meant to be placed on the floor or a table....

 Advantages of Qianye Cordless Spring Components
Advantages of Qianye Cordless Spring Components

Time:2022-9-14

All curtain cords, whether installed on the side, caught in curtains, or placed on the back, can be dangerous to children. It is best to replace all corded curtains with cordless curtains in houses where children live or visit, especially in children's bedrooms and play areas. Cordless roller blinds with either a spring system or an electric system can improve...

 Nine factors that should be paid attention to in spring production
Nine factors that should be paid attention to in spring production

Time:2022-9-14

A spring is a mechanical part that works with elasticity. Generally made of spring steel. It is used to control the movement, buffering or vibration, energy storage, force measurement, etc. of mechanical parts, and is widely used in machines and instruments. (1) Elastic limit - the elastic limit is related to the tensile strength. Selecting a material with a high elastic limit...

Product