![]() ![]() The hysteresis resulting from parallel stacking can be employed to advantage in those applications of a ‘shock absorbing’ nature, requiring a damping feature. 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. 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. 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.Į.G. 2 above illustration) It must be realised that the individual disc springs in a column assembled in parallel perform as separate entities, thus generating considerable interface friction. 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. With such arrangements, it is necessary to provide some form of compression limiting device for the ‘lighter’ disc springs, to avoid over-compression whilst the ‘heavier’ springs are still in process of deflection.ĭisc springs are assembled ‘nested’ inside each other, i.e. ![]() Normally, disc springs stacked in ‘series’ formation are of identical dimensions, however, it is feasible to stack numbers of disc springs of increasing thickness in order to achieve ‘stepped’ and progressive characteristics. A ‘rule of thumb’ is that the length of the stacked disc springs should not exceed a length approximately equal to 3 times the outside diameter of the disc spring. In extreme cases this may result in over-compression and premature failure of the end springs. The cumulative effect of bearing point friction of large numbers of disc springs stacked in series, can result in the disc springs at each end of the stack deflecting more than those in the centre. A disc spring that requires a force of 5000N to deflect 1mm, when assembled to form a column of 10 disc springs in series, will require a force of 5000N to deflect 10mm. This ‘in series’ formation ( no.3 in above illustration) is a means of multiplying the deflection of a single disc spring, the force element remains as that for a single spring.Į.G. ![]() Single disc springs are assembled ‘opposed to each other’ to form a spring column. ![]()
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