10 Different Types of Springs (Mechanical Spring)

What is a Spring? (Mechanical Spring)

A spring is a flexible device that can store mechanical energy, most often crafted from a special kind of steel known as spring steel. While there are many different designs, people usually think of coil shaped springs in everyday situations.

At its core, a spring is just a metal wire formed in such a way that it can compress, stretch, twist, or slide depending on how it’s used.

When you push, pull, or twist a spring, it pushes back with a force. The direction and type of force whether it’s pressure, torque, or pulling power depends on the design of the spring and how it’s being used.

The basic principle behind most springs is pretty straightforward. If you take a standard spring (one that doesn’t have any fancy features to change its stiffness) and either compress or stretch it away from its original length, it will resist the change.

The further you push or pull, the stronger the spring pushes back, and this resistance is roughly proportional to how much you’ve changed its length.

Springs can be made from several types of elastic materials, but spring steel is the go to option for most applications. The manufacturing process varies: small springs are typically wound from steel that’s already been hardened, while larger springs are formed from softer, annealed steel and then hardened afterwards.

For certain jobs, non-ferrous metals get the nod. If you need corrosion resistance, for instance, phosphor bronze and titanium are good picks. And for springs that have to carry an electrical current since they have low electrical resistance beryllium copper is often the material of choice.

What is the function of Spring?

The Function of Springs are:

• To absorb the shock or vibration as in car springs, railway buffers, etc.
• To measure the forces in a spring balance.
• Apply forces in brakes and clutches to stop the vehicles.
• Spring is also used to store the energy as in clocks, toys, etc.
• Spring can control the motion of cams and followers by maintaining contact between two elements.

Types of Springs

The most common spring types include:

• Compression Springs.
• Extension Springs.
• Torsion Springs.
• Constant Force Springs.
• Belleville Springs.
• Drawbar Springs.
• Volute Springs.
• Garter Springs.
• Flat Springs.
• Gas Springs.
• Air Springs.

#1. Compression Springs.

A compression spring is essentially a helical spring with open coils, specifically designed to withstand axial compressive forces.

While most compression springs maintain a consistent coil diameter throughout, there are variations to suit particular needs; for instance, you might encounter springs formed in shapes like conical, barrel (concave), hourglass (convex), or even combinations of these designs.

The primary function of compression springs lies in their ability to counteract applied forces and, depending on the context, to store mechanical energy for later use. Their adaptability makes them a familiar choice across a range of mechanical and engineering applications.

#2. Extension Springs.

Extension springs are designed to absorb and store energy while offering resistance to a pulling force. Typically, these springs are anchored at both ends to separate components.

When those components are pulled apart, the spring acts to draw them back together, effectively restoring the original position.

A key factor in how an extension spring behaves is its initial tension the force that keeps its coils tightly wound even before any load is applied. By adjusting this initial tension, engineers can tailor a spring’s performance to meet specific load requirements for different applications.

The ends of extension springs usually feature hooks, eyes, or other specialized shapes to connect with the corresponding components.

This design makes them especially useful for situations where a part needs to return to its original position after being extended, such as in actuated systems that rely on a restoring force.

#3. Torsion Springs.

Torsion springs are a type of helical spring specifically designed to deliver torque that is, a rotary force rather than just simple compression or extension.

The basic idea is straightforward: each end of the spring gets anchored to separate components, and as those parts rotate around the spring’s center, the spring responds by wanting to pull them back to where they started.

Interestingly, despite what the name suggests, torsion springs actually experience bending stress, not torsional stress.

What they’re really good at is storing angular energy, which means they can either release that energy when needed or simply hold a mechanism in a fixed position by allowing their legs to deflect around the body’s central axis.

Most torsion springs you’ll come across are tightly wound, with the coils sitting close together. However, sometimes a bit of spacing called pitch is introduced between the coils to cut down on friction. Functionally, these springs resist forces that try to twist or rotate them.

The direction in which a torsion spring operates either clockwise or counterclockwise depends entirely on the specific application. This requirement will also dictate how the spring itself is wound, making the direction of the wind an important design consideration.

#4. Constant Force Springs.

The extension type constant force spring is probably the simplest, but also one of the most adaptable, versions of this spring family. Essentially, it’s made from a pre stressed strip of spring steel that’s tightly wound into coils, either around itself or onto a drum, keeping a nearly constant radius throughout.

When you pull the strip out basically stretching or “deflecting” it the built in tension in the material pushes back against your force, a lot like what happens with a regular extension spring.

The key difference here is that the resistance stays almost the same, regardless of how far you pull, so the “rate” is close to zero.

If you want to get a steady torque out of it, you can attach the free end of the spring to another spool and wind it up, either in the same direction it was coiled or the opposite. This setup gives you a consistent rotational force, which can be really useful in a variety of mechanical designs.

It’s worth noting that the spring doesn’t hit its full working load right away. You need to stretch it out to about 1.25 times its coil diameter before it delivers its rated force.

After that, no matter how much farther you extend it, the force it supplies stays pretty steady. Ultimately, how much load the spring can handle depends on the thickness and width of the metal strip, as well as the coil’s diameter.

#5. Belleville Springs.

Belleville springs, often referred to as disc springs due to their slightly conical shape, serve a unique role in mechanical assemblies. Rather than being simple flat washers, these components are specifically engineered to provide pre tension when used with fasteners such as bolts.

In practice, a bolt is threaded through a Belleville spring and secured to a substrate, creating a controlled preload in the assembly.

These springs are manufactured in a wide range of materials to suit different applications and environments. Common options include 17-7 PH stainless steel, 301 stainless steel, beryllium copper, H13, phosphor bronze, as well as versions with ZC or ZY plating.

This material diversity allows engineers to select the most appropriate spring based on factors like corrosion resistance, strength, or electrical conductivity.

#6. Drawbar Springs.

Drawbar springs are particularly advantageous in scenarios where there is a risk of potential overload, primarily because they incorporate a unique safety mechanism.

Even if the spring itself fractures under excessive stress, it is still able to support a static load, reducing the likelihood of sudden failure.

The design of a drawbar spring is such that the load is transmitted through long steel loops. These loops extend through the center of the spring and hook around the opposite end. When a force is applied, the spring compresses, thanks to this internal loop configuration.

You’ll often find drawbar springs used in practical settings like porch swings, where they provide both reliable support and an added margin of safety in case of unexpected loads.

#7. Volute Springs.

A volute spring is essentially a type of compression spring, but instead of the typical cylindrical shape, it’s designed more like a cone think of it as similar to the classic volute form you might see in architecture.

What makes this spring interesting is how, when you compress it, the coils actually slide over each other. This design means the spring can be squashed down to a much shorter length than a standard helical spring would allow.

If you look at the material before it’s coiled up usually spring steel it actually starts off shaped like a “V.” When the spring is wound, each end of that “V” ends up at the outer edges of the finished spring, which itself isn’t a perfect cylinder but a bit wider in the middle. The point of the “V” sits right in the center of the spring.

You’ll often come across these springs in tools like garden secateurs (those pruning shears gardeners love). The way they’re held in place is pretty straightforward: each handle of the secateurs has a short post anchored to it, and these posts slot neatly into the narrow ends of the volute spring.

This setup keeps the spring firmly positioned between the handles and ensures the tool works smoothly every time you squeeze or release it.

#8. Garter Springs.

A garter spring is essentially a steel coil formed into a loop by connecting its ends, resulting in a circular spring. This particular design finds common use in applications such as oil seals, shaft seals, belt-driven motors, and electrical connectors, where a consistent circular force is needed.

There are two main types of garter springs, each serving a different purpose. Compression garter springs apply outward radial pressure, pushing away from the center, while extension garter springs do the opposite, exerting inward radial force toward the center. This distinction makes them versatile for both holding things in place and keeping them sealed tightly.

When it comes to manufacturing, the process is quite similar to that of standard coiled springs. The primary difference is that the ends of the spring are joined together to complete the circle.

Garter springs are usually made from either carbon steel or stainless steel wire, much like other types of springs, which gives them both strength and durability in a range of operating environments.

#9. Flat Springs.

Flat springs are essentially thin, flat pieces of material designed to flex under an external force and then return to their original shape, storing and releasing energy in the process.

Unlike the larger, more recognizable coil springs, flat springs are typically much smaller and are often manufactured as stamped metal parts. Their primary role is to manage movement or deflection, especially in applications where space is tight or where only limited movement is required.

The manufacturing process usually starts with a strip of metal, which is then bent or shaped into the desired form. The choice of material for these springs isn’t one size fits all it varies depending on what the spring will be used for.

High-carbon steels are quite common, but copper alloys, titanium, and even special high temperature alloys might be selected for specific needs or more demanding environments.

#10. Gas Springs.

A gas spring functions differently from the more familiar mechanical springs. Rather than depending on elastic deformation, a gas spring stores potential energy by compressing gas within a sealed cylinder.

This cylinder is closed off by a sliding piston, allowing the gas to act as the main force resisting component when an external force is applied along the axis of the piston rod.

You’ll often come across gas springs in everyday objects. For example, they’re the reason your car’s hatchback stays open without much effort, thanks to their use in the support struts.

Office chairs, too, use gas springs to provide smooth height adjustments. Their utility extends beyond these common uses, showing up in various types of furniture, as well as in medical and even aerospace equipment.

On the industrial side, much larger versions of gas springs play a crucial role in manufacturing machinery—especially in the press tooling sector.

Here, the required force can be substantial, with some gas springs delivering anywhere from 2,500 newtons all the way up to 400,000 newtons (which is roughly forty tonnes).

#11. Air Springs.

Air springs are essentially flexible devices think of them as pressurized bellows or bladders that come in many shapes and sizes. Their main job is to provide actuation, absorb shocks, and help isolate vibrations.

When choosing an air spring, a few key factors come into play: what you’re using it for, its type and style, physical size, mounting method, and any specific features you might need.

In most cases, you’ll find air springs in machines vehicle suspension systems are a classic example, where they handle shock absorption.

They’re also commonly used as machine mounts to keep vibrations in check. Manufacturers design them in various forms and capacities, so you can pick exactly what suits your load and application requirements.

Beyond those uses, air springs can also be used for lifting, compressing, or even tilting equipment. When their main purpose is to isolate vibration, you might hear them referred to as “air cushions.”

Application of Springs

• Applying Forces and Managing Motion: Springs play a crucial role in mechanisms like brakes and clutches, where they help regulate how force is applied and how motion is controlled. Essentially, they act as key players in ensuring these systems work smoothly and reliably.
• Force Measurement: Another everyday use of springs is in devices that measure force, such as a spring balance. Here, the spring’s ability to stretch in response to weight lets us measure how much force is being applied a principle that’s both simple and effective.
• Energy Storage: Springs are also valued for their capacity to store energy. Think of the tightly wound springs inside traditional watches or even in wind-up toys. When released, the stored energy powers movement, showcasing a clever way to harness mechanical energy for various uses.
• Shock and Vibration Reduction: Finally, springs are essential when it comes to absorbing shocks and dampening vibrations, especially in vehicles and the foundations of machines. By buffering these forces, they help protect both the equipment and anyone using it, making rides smoother and machinery more durable.

Advantages of Spring

• Springs are commonly used in vehicles to minimize vibrations. Sudden jolts or vibrations, especially while driving, can be uncomfortable for passengers and, in some cases, may even lead to issues like motion sickness or vomiting.
• In various types of machinery, springs play a crucial role in reducing unwanted vibrations, helping maintain both performance and longevity.
• Springs also serve an important function in mechanisms like clutches and brakes, where they’re used to apply force and manage motion more effectively.
• Another everyday example is energy storage think about mechanical watches or wind up toys. Springs are designed to store and gradually release energy, making these devices work smoothly.
• One reason springs are so widely used is their durability. They tend to withstand repeated use over long periods without significant wear.
• A unique feature of springs is their ability to store energy when compressed or stretched, which can then be released as needed.
• On the practical side, springs are generally straightforward to design and are cost-effective to manufacture, which is always a plus for engineers and manufacturers.
• Finally, most springs require little to no maintenance once installed, making them a hassle-free solution in many applications.

Disadvantages of Spring

• If the spring bends or stretches beyond a certain limit, there’s a real risk it could buckle under the strain.
• Swapping out a spring isn’t always straightforward; it can be quite a challenge to replace when needed.
• And once a spring gets damaged, fixing it isn’t easy repair tends to be tricky, if not impossible.

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