Excellent load precision and durability. Any non-linear progressive load characteristics can be obtained by combinations of springs.

Total deflection/thickness and load characteristics

Even when the thickness (S) is the same, due to the ratio to the total deflection (h), the load characteristics of the disc spring appear as the load-deflection curve shown on the left.

Combination and load characteristics

By different combinations, disc springs can provide various load characteristics.
The graph on the left shows disc springs stacked in tandem and in parallel.
The loadﾐdeflection relationship is as follows:

A In tandem f = nf1 p = p1
B In parallel f = f1 p = np1
(n is the number of springs stacked.)

Table 1 Appropriate value for guide clearance
(Clearance is the diameter difference.)

Fig. 1 Inside diameter guide


Fig. 2 Outside diameter guide

Disc spring guide

In general, when a disc spring is compressed, its inside diameter becomes smaller and the outside diameter gets bigger. In contrast, the change of inside diameter of our disc spring is minimal. The clearance between a disc spring and its guide is shown in Table 1. The guide is either an inside diameter guide (Fig. 1 at bottom-left) or outside diameter guide (Fig. 2 at bottom-left). In most cases an inside diameter guide is used. The guide surface should be flat and smooth with thermal refining (the hardness should be approximately HRC55 - 60 by entire quenching or surface quenching).