spring parameters for dimensions & calculation

Disc springs are determined essentially by the following three parameters: 

δ =	Outside diameter De
	Inner diameter Di
Ho/t =	Cone height Io - t
	Disc thickness t
De/t =	Outside diameter De
	Disc thickness t

                          
If at all possible, the parameters above should be within the following values: 
 
δ       =    1.75…2.5 
h_o/t   =    0.4…1.3 
D_e/t   =    16…40 
 
For smaller values δ, smaller values of h_o/t and D_e/t also apply and vice-versa.

For steel springs with dimensions within these limits, formula 7 can be used without restriction. For very thin disc springs (D_e/t > 50) the formula results in spring forces which are too high.

Formula 7

 
 
For very narrow disc washers with a ratio of diameters of D_e/D_i < 1.75, the shortening of the lever arm must be considered when calculating the force. This is brought about by the rectangular cross-section and by the rounded edges and results in the calculation of too low a load. In all such cases please contact us.