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Stacking in Parallel

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Stacking Disc Springs in Parallel

Disc springs are assembled 'nested' inside each other, i.e. the same way up, the resultant force for such a column is the force element of a single disc spring multiplied by the number of 'nested' disc springs in the column, whilst the deflection remains the same as for that applicable to a single disc spring.

It must be realised that the individual disc springs in a column assembled in parallel perform as separate entities, thus generating considerable interface friction. For a given deflection, this interface friction will result in 3% increased force per interface, this must be taken into account when calculating the total force from parallel stacking.

E.G. A disc spring that requires a force of 5000N to deflect 1mm, when assembled of 3 disc springs in parallel, will require a force of 15900N to deflect 1mm.

It is advised that the number of disc springs in parallel should not normally exceed 3, or in extreme cases 5 springs, to minimise heat generated by friction or, in the case of static applications, to ensure a workable relationship between the loading and unloading characteristics. The hysteresis resulting from parallel stacking can be employed to advantage in those applications of a 'shock absorbing' nature, requiring a damping feature.

The life of disc springs in parallel arrangements is very dependant on adequate lubrication of the spring interfaces.

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Valley Spring Co Ltd
Pottery Lane East
Chesterfield, Derbyshire
United Kingdom S41 9BH

Valley Spring Company: Chesterfield Derbyshire

Tel: +44 (0)1246 451981
Fax: +44 (0)1246 454327

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