Disc Springs Made from Polymers
Original article date: May 1998
Disc springs made from polymers are an innovative new addition to the Igus product range.
Polysorb disc springs are very space efficient and especially suited for a wide range of manufacturing industries where product designs necessitate a short spring length.
Design benefits and advantages claimed for these non-magnetic springs include improved linear spring characteristics compared with metal alternatives and the elimination of running tolerance and end float. They absorb vibration reduce noise and made from insulating materials provide electrical and thermal isolation.
Polymeric materials are also corrosion resistant and require no lubrication. They are relatively light and reduce space requirements. The Polysorb springs can be used up to 80degC and still have a spring force of 8N. In the event of being used for long periods in submerged conditions they can show a spring force of 10N.
The spring length of a disc spring is relatively small. In practice several disc springs are combined alternately as a stack of springs to increase spring travel which increases in proportion to the number of springs used while the spring force remains the same as that of a single spring. To increase the force the disc springs can be combined in parallel.
| Medium | Resistance |
| alcohols | resistant |
| chlorinated hydrocarbons | resistant |
| esters | not resistant |
| greases oils | resistant |
| ketones | limited |
| fuels | resistant |
| weak acids | limited |
| strong acids | not resistant |
| weak alkalis | resistant |
| strong alkalis | resistant |
| water | resistant |
Dimensions of the part Spring lengths and Forces
| OD
(mm) |
ID
(mm) |
plate thick- ness (mm) |
max spring (mm) |
25% len (mm) |
force at 25% (N) |
50% len (mm) |
force at 50% (N) |
75% len (mm) |
force at 75% (N) |
force at 100% (N) |
weight of plate (g) |
| 10.0 | 5.2 | 0.5 | 0.25 | available soon | |||||||
| 12.5 | 6.2 | 0.7 | 0 .30 | available soon | |||||||
| 16.0 | 8.2 | 0.9 | 0.35 | 0.09 | 4 | 0.18 | 8 | 0.28 | 11 | 12 | 0.20 |
| 20.0 | 10.2 | 1.1 | 0.45 | 0.11 | 5 | 0.22 | 10 | 0.33 | 15 | 18 | 0.33 |
| 25.0 | 12.2 | 1.5 | 0.55 | 0.14 | 9 | 0.28 | 18 | 0.42 | 27 | 35 | 0.85 |
| 31.5 | 16.3 | 1.75 | 0.70 | available soon | |||||||
| 40.0 | 20.4 | 2.25 | 0.90 | available soon | |||||||
- Igus
- Tel: 01327 31366
- http://www.igus.de
May 1998