What is the difference between compression springs and tension springs?

Compression springs and tension springs are two common but functionally different types of springs that play different roles in industry and machinery.

First, their functions and working principles are different. Compression springs provide force when compressed, causing them to shorten. This type of spring is commonly found in applications that need to resist or absorb compressive forces, such as vehicle suspension systems, compression machinery, printers, and the suspension systems of household appliances.

Tension springs provide force when stretched or extended. When an external force stretches them, they extend and store energy, providing the system with the required pulling force. This type of spring is commonly used in automatic opening and closing systems of doors and windows, tension devices of industrial machinery, and lifting mechanisms.

Secondly, their designs and shapes also differ. Compression springs are usually helical in shape with their coils compressed together. Tension springs are usually straight or slightly curved and will lengthen or stretch when external force is applied.

Material selection is also one of the differences between them. While both may use similar materials, such as high carbon steel, stainless steel, or alloy steel, the material chosen and treatment depends on the specific use of the spring. For example, automotive suspension systems may require more corrosion-resistant stainless steel, while industrial machinery may require stronger steel alloys.

In addition, their application scenarios are also different. Compression springs are typically used where compression needs to be resisted, shock absorption, or to maintain compact spaces, while tension springs are more commonly used where tension or support is required.

Although there are obvious differences in functions and applications between compression springs and tension springs, they are both indispensable components in engineering design and manufacturing, providing necessary strength support for various machinery and systems.