Stacking Belleville Washers & Disc Springs
If you stack 6 discs in parallel, you gain 6 times the load capacity of a single disc, but your maximum deflection is that of a single disc. For example, using part# CDM-63203, you would achieve a total load of 222 lbs (37x6), an O.H. .078", but a deflection of .006".
If you stack 5 discs in a series, you achieve 5 times the deflection of one disc, but the same load as a single disc. For example, using part# CDM-63203, you would achieve a total load of 37 lbs, an O.H. of .089", and a total deflection of .030".
Mixed Stacking - Parallel & Series
Belleville washers stacked in series and parallel in combinations can be arranged to produce almost any load-vs.-deflection trend that you need (linear, progressive, regressive, etc.).
In disc spring stacks, particularly those with parallel units, friction should be considered. Sliding friction is created at the disc's adjoining, moving surfaces. As a result, the deflection which occurs when loading a stack of discs will lag as the stack is unloaded (hysteresis). This characteristic may be taken advantage of in shock or oscillatory loaded systems needing damping.