Constant Force Springs
Constant force springs offer constant tension and retraction, they can generate uncoiling force after coiling, This feature makes them wildly used in applications requiring smooth retracting, counterbalancing, tensioning, etc.
Yongsheng produce constant force springs since 2002, we can supply design, manufacturing, mounting & assembly service, etc.
A wide range of stainless steel constant force springs.
Full Customization from drawing to final products.
Mass springs in-stock can greatly save your time and cost.
ISO9001 & ISO14001 certified facilities.
Customize Your Constant Force Springs with Yongsheng’s Personalized Service
Constant force springs, also known as constant tension springs, generate constant tension force during operation.
At Yongsheng, we specialize in manufacturing a wide range of constant force springs to meet your versatile needs. Our springs are available in various thicknesses, ranging from 0.06mm to 0.6mm, and widths from 2mm to 55mm. We offer stainless steel and carbon steel materials to suit different requirements.
Yongsheng offers special processes for constant force springs to meet your higher force requirements.
Our capabilities include multi-layer laminated springs and multiple-load assembly. These techniques enable us to create custom solutions to meet your stronger tension requirements.
With our in-house tooling and plastic injection workshop, Yongsheng provides a streamlined production process. Not only the springs, but we also provide customized plastic parts that work with the springs, and the assembly and mounting services, ensuring a hassle-free experience for you.
Constant Force Springs Assembly/ Mounting Service
Yongsheng supplies mounting/ assembly service, we mount parts including wheel reels, cable reels, retractors, and motor brushes.
What Set Yongsheng Apart With Average Constant Force Spring Supplier in China
How Do We Assure The Quality of The Constant Force Springs?
In YongSheng, quality is always in the core position and works throughout the entire springs’ production process. Your constant force springs will go through all kinds of testing & inspection before shipping to your hand.
From the beginning of your concept, our service has launched, the process from the pre-sales guide, R&D assistant, raw material confirmation to the IQC, trial production, kinds of testing, mass production and FQC, packaging, etc. Check the whole production process of constant force springs below. We will always be at your service and expect to help you boom this business.
Yongsheng Constant Force Springs
YongSheng has been in the springs industry for over 18 years, we can supply full customized service for your variety of constant force springs, with high quality and affordable price.
If you want to find a supplier of constant force springs in China, YongSheng will be your preferred partner.
If you want to find a constant force spring supplier in China, YongSheng will be your best choice.
YongSheng manufactures all kinds of flat coil springs like constant force springs, power springs, spiral torsion springs, variable force springs, constant torque springs.
No matter whether you are a wholesaler or a company, you can pay all your attention to your own customers and have no worries with your spring products.
We have the capability to provide a one-stop solution service for you, from a pre-sales guide to the final shipping, etc. All key-point of the process can be sent to you via videos and reports.
Yongsheng also supplies mounting & assembly service for your constant force retractor or constant force spring motor products, with our powerful in-house capability, including the mold-making shop, plastic injection, mounting & Assembly team. You can significantly save money and time on it.
with decades of experience in the industry, we know what you need, and what you are concerned about, tell us your spring specification or application, let us take care of your springs, and boom the business together, always at your service.
YongSheng’s constant force springs are made of 301SUS stainless steel strip, which belongs to the high-strength stainless steel with yield strength. when it is shaped through our special forming machine(developed in-house), it will be coiled and generate constant tension force to resist uncoiling.
The Advantage of Yongsheng Constant Force Springs:
- Complete testing processes like salt spray testing, tension testing, fatigue testing, and so on.
- Mass ready-made toolings in stock(For tail details), greatly save your time and cost.
- Special techniques like high-temperature baking and lubricating process make our springs more stable, anti-rust, and longer lifespan.
Constant Force Spring Mounting
There are two ways to mount constant force springs, one is drum mounting and the other one is cavity mounting.
For drum mounting, the spring is fixed to the axis, and when the tension is forced in the spring, the drum axis will be rotating with the spring. The springs in shelf pushers use this mounting method.
For cavity mounting, like the illustration below, the spring is set in the cavity, and the whole operation is placed inside. This method wildly used in Gym equipment.
Normally, it needs to add some lubricating oil in it to decrease the friction during the operational process.
drum mounting
cavity mounting
Multiple Load Design For Constant Force Springs
Constant force springs can generate constant tension force, we can get stronger tensile force across the different designs of mounting as in the below illustration.
Normally, there are three ways to design multiply-load for constant force springs, they are coiled in tandem, back-to-back parallel, multi-layer laminated load.
Multiply loaded springs feature stronger tension force in the same distance, it is usually applied in lifting, window balance, etc.
Tandem
back to back parallel
multiply load
Constant Force Spring Mechanism
Constant force springs are designed to generate a uniform tension force over a specific distance, which lies in its flat ribbon shape, the helically coiled ribbon strip can exert a near-constant force throughout its entire extension.
constant force springs feature equal extend and retract force, which makes them versatile for applications such as counterbalances, retractable cables, and much more.
Consult our expert with your application, and let’s make a customized application solution for you.
Constant Force Spring Applications
Constant force springs are wildly used in various fields, such as position-adjusting in the home appliance like monitor, electric fan, pushing in shelf pusher, position movement in medical tables. Constant force window balance spring is used in the cordless shades.
Height Adjusting
Electric Fan
Horizontal Moving
Shelf Pusher
Stock Constant Force Springs in YongSheng, Favorable Price For You
Select your type of springs in below stock table, and you will get a favorable pricing
| Constant force springs | ||||||||||||||||||||||||
| Part Number | T | W | L | Force at different stroke(kg) Stroke dimension(mm) +/-5% | Dimension (mm) | |||||||||||||||||||
| 100 | 150 | 200 | 250 | 300 | 350 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | ∅C | ∅W | No.of Holes | ∅S/∅V | A1 | D1/M | F | R | ||||
| YSH0175CF | 0.1 | 7.5 | 150 | 6.1 | 7.45 | 1 | 4.15 | 15.17 | 1.4 | / | 2.25 | |||||||||||||
| YSH0214CF | 0.2 | 14 | 140 | 11.64 | 13.1 | 2 | 1.86 | 0 | 2.06 | 5.12 | / | |||||||||||||
| YSH02115CF | 0.2 | 11.5 | 110 | 11.08 | 12.41 | 2 | 1.88 | 7.27 | 1.87 | 5.09 | / | |||||||||||||
| YSH0212CF | 0.2 | 12 | 160 | 16.89 | 18.2 | 2 | 2.13 | 18.54 | 3.1 | 3.95 | / | |||||||||||||
| YSH018CF | 0.1 | 8 | 120 | 6.06 | 7.14 | 1 | 3.08 | 12.53 | 1.3 | / | / | |||||||||||||
| YSH0213CF0 | 0.2 | 13 | 180 | 1.6 | 12.99 | 14.76 | 1 | 2.11 | 0 | 1.51 | / | / | ||||||||||||
| YSH0213CF | 0.2 | 13 | 250 | 1.16 | 1.17 | 16.58 | 18.51 | 2 | 1.77 | 10.25 | 2.02 | 5.15 | / | |||||||||||
| YSH01511CF | 0.15 | 11 | 378 | 0.81 | 0.81 | 0.86 | 0.86 | 10.58 | 13.77 | 1 | 5.53 | 8.64 | 2.39 | / | 13 | |||||||||
| YSH01110CF | 0.11 | 10 | 300 | 0.38 | 0.38 | 0.38 | 9.58 | 11.61 | 1 | 5.16 | 15.05 | 2.53 | / | 1.25 | ||||||||||
| YSH0212CF12 | 0.2 | 12 | 420 | 1.4 | 1.5 | 1.58 | 11.66 | 15.71 | 1 | 4.93 | 11.3 | 1.58 | / | 12 | ||||||||||
| YSH0114CF | 0.1 | 14 | 400 | 0.13 | 0.13 | 0.14 | 16.94 | 18.68 | 1 | 4.7 | 12.8 | 2.65 | / | 1.25 | ||||||||||
| YSH01110CF7 | 0.11 | 10 | 460 | 0.3 | 0.3 | 0.3 | 11.37 | 14 | 1 | 2.94 | 11.26 | 4.45 | / | 7 | ||||||||||
| YSH0225CF | 0.2 | 25 | 600 | 2.05 | 2.11 | 2.25 | 2.33 | 15.03 | 19.88 | 2 | 4.36 | 11.44 | 4.08 | 8.25 | / | |||||||||
| YSH01612CF | 0.16 | 12 | 540 | 1 | 1.05 | 1.08 | 1.09 | 11.24 | 15.62 | 1 | 4.93 | 10.71 | 1.67 | / | 11 | |||||||||
| YSH01595CF | 0.15 | 9.5 | 555 | 0.55 | 0.55 | 0.58 | 0.58 | 11.62 | 15.53 | 1 | 3.23 | 20.25 | 3.06 | / | / | |||||||||
| YSH0225CF10 | 0.2 | 25 | 700 | 1.96 | 2.03 | 2.06 | 2.09 | 2.18 | 15.45 | 20.41 | 2 | 4.45 | 40.01 | 6.6 | 10.56 | / | ||||||||
| YSH015127CF | 0.15 | 12.7 | 640 | 0.75 | 0.77 | 0.78 | 0.83 | 0.88 | 11.21 | 15.84 | 1 | 4.81 | 13 | 6.3 | / | 13 | ||||||||
| YSH02127CF | 0.2 | 12.7 | 765 | 1.04 | 1.08 | 1.11 | 1.2 | 1.24 | 1.26 | 15.05 | 20.82 | 1 | 4.86 | 17.54 | 6.45 | / | 12 | |||||||
| YSH0220CF | 0.2 | 20 | 1016 | 0.64 | 0.66 | 0.66 | 0.69 | 0.69 | 0.69 | 0.72 | 0.73 | 24.46 | 29.41 | 1 | 4.95 | 16.69 | 7.53 | / | 10.5 | |||||
| YSH01820CF | 0.18 | 20 | 1680 | 0.44 | 0.44 | 0.48 | 0.48 | 0.48 | 0.5 | 0.5 | 0.5 | 0.5 | 0.53 | 23.46 | 30.7 | 2 | 3.02 | 0 | 2.5 | 4.94 | 1 | |||
T: Thickness, W: Width, L: Length
| Constant Force Springs | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Product No. | T(mm) | W(mm) | L(mm) | Force at different stroke(kg) Stroke dimension(mm) +/-5% | Dimension(mm) | |||||||||||||||||||
| 100mm | 150mm | 200mm | 250mm | 300mm | 350mm | 400mm | 500mm | 600mm | 700mm | 800mm | 900mm | 1000mm | ∅C | ∅W | No.of Holes | ∅S/∅V | A1 | D/E | F | R | ||||
| YSH0175CF | 0.1 | 7.5 | 150 | 6.1 | 7.45 | 1 | 4.15 | 15.17 | 1.4 | / | 2.25 | |||||||||||||
| YSH0214CF | 0.2 | 14 | 140 | 11.64 | 13.1 | 2 | 1.86 | 0 | 2.06 | 5.12 | / | |||||||||||||
| YSH02115CF | 0.2 | 11.5 | 110 | 11.08 | 12.41 | 2 | 1.88 | 7.27 | 1.87 | 5.09 | / | |||||||||||||
| YSH0212CF | 0.2 | 12 | 160 | 16.89 | 18.2 | 2 | 2.13 | 18.54 | 3.1 | 3.95 | / | |||||||||||||
| YSH018CF | 0.1 | 8 | 120 | 6.06 | 7.14 | 1 | 3.08 | 12.53 | 1.3 | / | / | |||||||||||||
| YSH0213CF0 | 0.2 | 13 | 180 | 1.6 | 12.99 | 14.76 | 1 | 2.11 | 0 | 1.51 | / | / | ||||||||||||
| YSH0213CF | 0.2 | 13 | 250 | 1.16 | 1.17 | 16.58 | 18.51 | 2 | 1.77 | 10.25 | 2.02 | 5.15 | / | |||||||||||
| YSH01511CF | 0.15 | 11 | 378 | 0.81 | 0.81 | 0.86 | 0.86 | 10.58 | 13.77 | 1 | 5.53 | 8.64 | 2.39 | / | 13 | |||||||||
| YSH01110CF | 0.11 | 10 | 300 | 0.38 | 0.38 | 0.38 | 9.58 | 11.61 | 1 | 5.16 | 15.05 | 2.53 | / | 1.25 | ||||||||||
| YSH0212CF12 | 0.2 | 12 | 420 | 1.4 | 1.5 | 1.58 | 11.66 | 15.71 | 1 | 4.93 | 11.3 | 1.58 | / | 12 | ||||||||||
| YSH0114CF | 0.1 | 14 | 400 | 0.13 | 0.13 | 0.14 | 16.94 | 18.68 | 1 | 4.7 | 12.8 | 2.65 | / | 1.25 | ||||||||||
| YSH01110CF7 | 0.11 | 10 | 460 | 0.3 | 0.3 | 0.3 | 11.37 | 14 | 1 | 2.94 | 11.26 | 4.45 | / | 7 | ||||||||||
| YSH0225CF | 0.2 | 25 | 600 | 2.05 | 2.11 | 2.25 | 2.33 | 15.03 | 19.88 | 2 | 4.36 | 11.44 | 4.08 | 8.25 | / | |||||||||
| YSH01612CF | 0.16 | 12 | 540 | 1 | 1.05 | 1.08 | 1.09 | 11.24 | 15.62 | 1 | 4.93 | 10.71 | 1.67 | / | 11 | |||||||||
| YSH01595CF | 0.15 | 9.5 | 555 | 0.55 | 0.55 | 0.58 | 0.58 | 11.62 | 15.53 | 1 | 3.23 | 20.25 | 3.06 | / | / | |||||||||
| YSH0225CF10 | 0.2 | 25 | 700 | 1.96 | 2.03 | 2.06 | 2.09 | 2.18 | 15.45 | 20.41 | 2 | 4.45 | 40.01 | 6.6 | 10.56 | / | ||||||||
| YSH015127CF | 0.15 | 12.7 | 640 | 0.75 | 0.77 | 0.78 | 0.83 | 0.88 | 11.21 | 15.84 | 1 | 4.81 | 13 | 6.3 | / | 13 | ||||||||
| YSH02127CF | 0.2 | 12.7 | 765 | 1.04 | 1.08 | 1.11 | 1.2 | 1.24 | 1.26 | 15.05 | 20.82 | 1 | 4.86 | 17.54 | 6.45 | / | 12 | |||||||
| YSH0220CF | 0.2 | 20 | 1016 | 0.64 | 0.66 | 0.66 | 0.69 | 0.69 | 0.69 | 0.72 | 0.73 | 24.46 | 29.41 | 1 | 4.95 | 16.69 | 7.53 | / | 10.5 | |||||
| YSH01820CF | 0.18 | 20 | 1680 | 0.44 | 0.44 | 0.48 | 0.48 | 0.48 | 0.5 | 0.5 | 0.5 | 0.5 | 0.53 | 23.46 | 30.7 | 2 | 3.02 | 0 | 2.5 | 4.94 | 1 | |||
Reduce Your Maintenance Cost With YongSheng Constant Force Springs
Yongsheng uses high-quality stainless steel to produce constant force springs, which feature longer lifespans and stable performance. Just tell us your application or the detailed size of the cavity or drum. Let us customize springs for you and help you cost down. Always at your disposal.
Adjustable Constant Force Spring
Adjustable constant force spring is excellent for height adjusting or position movement, it is popular in home appliances like height-adjusting electric fans, monitors, up-down tables, and position movements like medical equipment, CT scanners.
Constant Force Torsion Spring
Constant force torsion spring also called constant torque spring, belongs to the constant force springs, but utilizes the torsion force of spring when it works, it is wildly in a cordless window shade, cable wheel, and so on.
FAQ
Based on the special constant force tension feature, constant force springs are wildly used in many applications like point of purchase displays, home appliances, medical devices, windows, etc.
Based on the special constant force tension feature, constant force springs need well mechanical performance and high fatigue.
We can manufacture constant force springs by using high yield stainless steel, high carbon steel, and Inconel.
Constant force springs belong to flat coil springs, they are made of steel strip, which be shaped by the coil machine and tightly wrapped around the shaft.
Constant force springs feature constant retractable tension force, which make it widly used in smooth counterbalancing, tensioning, retracting places.
Normally, there are 2 ways of mounting a constant force spring as mentioned above, one is drum mounting, Another mounting way is cavity mounting.
How to choose one depending on your product, it involves many factors like load force, case room, width, thickness, length, the diameter of coil springs and so on.
You’d better inquiry our expert before deploying it, we will supply you the most suitable design based on our decade’s experience.
Want to know how does a constant force spring work, We must know the constant force spring mechanism first.
Constant force spring is made of flat stainless steel strip or carbon steel strip, it will be winded when through the springs forming machine, once the extort extension force in the terminal end, it will generate a counterbalance retractable effect.
People utilize this counterbalance retractable feature to the different applications, such as home appliances up and down function, auto facing in the front of shelf pusher.
For one constant force spring, We can use the equation to get the tension force of constant force spring directly, the equation is as below:
Tension Force =19400*thickness³*width/6.6/diameter²/1.2 (mm).
If apply the multiple loads, we need to get the summation of each spring’s tension force.
Example: there are 3 constant force springs for retractable function, they are Spring1, Spring2, Spring3, the tension force is as below:
Spring1 Tension = 19400*thickness³*width/6.6/diameter²/1.2 (mm)
Spring2 Tension = 19400*thickness³*width/6.6/diameter²/1.2 (mm)
Spring3 Tension = 19400*thickness³*width/6.6/diameter²/1.2 (mm)
Tension Force = Spring1 Tension + Spring2 Tension + Spring3 Tension
First of all, we need to confirm the raw material, different material has a different making technique. Normally, we use the high yield stainless steel strip or carbon steel strip.
Secondly, different width of springs determines which springs forming machine we will use, there are many types of spring forming machines in YongSheng, usually we take the 35mm as the critical point, above it we will use the special large forming machine, if not, we will apply the normal size forming machines.
Thirdly, some special techniques are necessary during springs making like the oil-soaking and high-temperature baking, it will make the springs more lubricating and anti-rust.
All of the above, actually it is a very long way to make the springs by mass production, YongSheng can supply all kinds of flat coil springs with high quality & competitive prices.
Life-cycle of the springs depends on many factors, such as the spring’s thickness, width, raw materials, load force, work temperature, and so on.
Normally, the larger springs, bigger load force, higher work temperature will have a shorter life-cycle.
Yes, we can, Heavy-duty constant force spring usually is used in big equipment for retractable function.
YongSheng can produce various of big constant force spring with our special springs forming equipment, the width of heavy-duty springs is up to 50mm, thickness up to 0.6mm, Our springs products go through a complete testing process before shipment, different environment and application will have the different requirements, inquiry our expert with your application right now!
Constant load spring means it has a constant load force, with this feature, sometimes we also called it constant force spring.
In other filed, we also called some kind steel flat spring as the constant load spring, coz it generates the constant load, like the loaded truck filed.
YongSheng can produces small constant force springs, the minimum dimension of width is up to 1.5mm, the minimum dimension of thickness is up to 0.06mm.
Normally, We use the small constant force springs based on the limited room, and the small constant force springs will have less tension than large. Therefore, we can use the laminated mounting or multiple loads of assembly to get bigger tension.
large constant force springs are similar to the heavy-duty constant force springs.
Yongsheng can manufacture all kinds of stainless steel large constant force springs. The maximum width dimension of large constant force spring is up to 50mm, the maximum thickness is up to 0.6mm.
Large constant force springs can generate bigger tension than small constant force springs, we increase the tension through laminate mounting or multiply load of assembly.
In the application of flat coiled springs, constant force springs take up a big portion, they are so normal in our life like electric fans, monitors, shelf pushers, and so on.
How to select appropriate constant force springs is a bit difficult for us, even for some professional staff.
And now, this guide will teach you detailedly, let’s dive in.
Firstly, make sure your application, the different application has different demands for strength, voyage, and function.
For instance, the monitor springs have these special features, such as short voyage, strong strength, and a small housing room.
Therefore, we need to consider these from the beginning, like the thickness and length of 301 SUS stainless steel strip, the multiply load method, and the cavity mounting.
Secondly, it’s better to make sure the method of constant force springs mounting at the early stage of the deal, this will save you a lot of time.
As mentioned before, there are two methods of mounting, drum mounting, and cavity mounting, which method be applied depending on the construction of your application.
The method of mounting will decide the diameter of your constant force springs, which will directly affect the processing technique.
Based on the construction and rich experience, we recommend you to chose the cavity mounting in the monitor application.
Thirdly, the last certainly doesn’t mean the least.
If the clients can supply the demands of strength and length of springs, it will be appreciated.
The strength will decide the multiple loads, and the length may decide the cavity room or drum size.
All in all, if you are a rookie, and want to purchase some constant force springs, you’d better tell your supplier the above information as detailed as possible, this will maximumly decrease your time in the later.
Meanwhile, if you are proficient, you can just directly ask for your demands or provide your design drawing.
Sample always be the best choice, if you can supply a spring sample, that will be very appreciated.
YongSheng has professional measuring equipment and can measure its length, width, thickness, force tension, torsion, material, and so on.
with over 18 years of experience and thousands of solutions worldwide, YongSheng will always be your best partner in flat coiled springs.
