DISC SPRING SYMBOLS & UNITS :
Symbols and Units : Standard sizes available as per DIN 2093
Group Classification of Disc springs
In accordance with DIN 2093 Standard, Disc Springs are classified into 3 groups as given in the table:
| Group |
Thickness of
single disc
in mm |
Single disc with Ground ends & reduced material
thickness (t') |
| 1 |
less than 1.25 |
No |
| 2 |
From 1.25 to 6 |
No |
| 3 |
Over 6 upto 14 |
Yes |
|
Symbols and Units
| Symbol |
Unit |
Term |
| De |
mm |
Outside diameter |
| Di |
mm |
Inside diameter |
| Do |
mm |
Mean diameter |
| E |
N/mm2 |
Modulus of elasticity |
| F |
N |
Spring load of a single disc
(with or without front ends) |
| ho |
mm |
Formed height |
| lo |
mm |
Free overall height of spring in its initial position |
| s |
mm |
Deflection of single disc |
| t |
mm |
Thickness of single disc |
| t1 |
mm |
Reduced thickness of single disc in the case of springs with ground ends (group 3) |
| µ |
|
Poisson's ratio |
δOM,ol,oil,
δIII, &δIV, |
N/mm2 |
Design stresses at the points designated OM, I, II, III, and IV
(see figure) |
| ▲F |
N |
Relaxation |
|
|
|
|
