Constant Force Linear Spring

Constant force linear springs, also known as constant force springs or spiral springs, are essential components in various engineering applications. They are designed to provide a constant load or force over a defined distance or stroke. These springs are commonly used in industries such as automotive, aerospace, medical, and electronics, among others.

What is a Constant Force Linear Spring?

A constant force linear spring is a flat strip of spring steel wound in a spiral shape. The spring steel material has high elasticity and can store and release energy. The coils of the spring are tightly wound, and the end of the strip is anchored to a fixed point. As a load is applied, the spring unwinds, releasing energy and exerting a constant force.

How Does a Constant Force Linear Spring Work?

The constant force linear spring works on the principle of Hooke’s law, which states that the force exerted by a spring is proportional to its displacement. In the case of a constant force linear spring, the displacement is linear, and the force is constant throughout the spring’s travel.

The spring is designed to exert a constant force over a defined distance or stroke. As the spring is unwound, the force remains constant until the spring reaches its maximum extension. At this point, the force drops to zero.

Applications of a Constant Force Linear Spring

Constant force linear springs are ideal for applications that require a constant force over a long stroke. Some of the common applications include:

1. Automotive Industry – Constant force springs are used in seat belt retractors, door locks, and window regulators.

2. Aerospace Industry – Constant force springs are used in retractable landing gear, cargo doors, and cockpit controls.

3. Medical Industry – Constant force springs are used in surgical instruments, implantable devices, and drug delivery systems.

4. Electronics Industry – Constant force springs are used in battery contacts, connectors, and switches.

Advantages of a Constant Force Linear Spring

1. Constant Force – Constant force springs provide a uniform force over a long stroke, making them ideal for applications that require consistent force.

2. Space Saving – Constant force springs are compact and can be designed to fit into small spaces.

3. Cost Effective – Constant force springs are cost-effective compared to other types of springs.

4. Long Life – Constant force springs have a long service life and can withstand millions of cycles.

5. Customizable – Constant force springs can be customized to meet the specific requirements of the application.

Conclusion

Constant force linear springs are a versatile and essential component in various engineering applications. They provide a constant force over a long stroke, making them ideal for applications that require a consistent force. They are cost-effective, compact, long-lasting, and customizable, making them the perfect solution for your engineering needs.