Nested Compression Springs
Compression Spring Design Resources – Custom Nested Springs
Compression springs are often used in combination because of space limitations and resonance considerations. A nest of compression springs can store more energy but will have lower natural frequencies than a single equivalent spring. Nested springs are not recommended when the diametral space is so restricted that a single spring would have an index of five or less. The following design practices apply to nested springs:
- To prevent internesting, the springs should be wound alternately left and right-hand.
- Clearance between springs must be at least twice the diameter tolerance.
- The most efficient distribution of load between individual springs varies with their indexes and the clearances between them. For a first approximation in designing a nest with 2 springs, 1/3 of the load should be on the inner spring and 2/3 on the outer spring.
- Solid heights and free heights should be about the same for all springs.
These practices result in springs with approximately the same index.
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