Nesting springs means to have one or more springs fitted inside a larger spring. Nested springs enable the spring designer to get more loadbearing material into a fixed space. By so doing, the springs are able to support a greater load than one spring alone could withstand. By reducing the working stresses within each nested spring, the probable working life of the springs is increased. Nested springs also enable the designer to reduce the length of the spring, thus reducing the chance of buckling.
When designing nested springs, it must be remembered that the springs adjacent to each other must be coiled in different directions, otherwise tangling is likely to occur in operation. These springs are used widely in demanding applications where high loads and long fatigue life are required, particularly within a small space.
Example of nested springs
Article written by David Banks-Fear and published on MDF by kind permission of Southern Springs & Pressings Limited.
David Banks-Fear is a Mechanical Design Forum Group member. He is a technical author and consultant design engineer with nearly 40 years of experience. He and his design team are available to assist with any technical design issues with springs, pressings and precision engineered parts. Email: firstname.lastname@example.org