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Polysorb - disc springs made of plastic
disc springs are annulus discs stressable in the axial direction, which are turned over in the shape of a disc in the axial direction. disc springs provide a more favorable space usage than other spring types. They are particularly suitable for designs that demand a small spring deflection.
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When to use Polysorb disk springs?
For the implementation of specially flat load deflection curves that are possible with metal only with considerable complexity and expenditure (slotted versions).
For compensation of axial clearance and manufacturing tolerances
For vibration compensation
For noise dampening
When an antimagnetic material is required
For electrical and thermal insulation
When no corrosion problems should arise
When lubrication is not necessary
For low weight
For low space requirement
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When not to use them?
When constant spring forces are necessary over a wide temperature range
When high spring forces are required
disc springs are annulus discs stressable in the axial direction, which are turned over in the shape of a disc in the axial direction. disc springs provide a more favorable space usage than other spring types. They are particularly suitable for designs that demand a small spring deflection.
The spring deflection of the disc spring is relatively small. Therefore a number of disc springs are combined in practice. Alternatively layered disc springs enhance the spring deflection in proportion to the number, whereby the overall spring force is as large as the force of the individual disc spring. To increase the force, the disc springs can be layered in parallel as a spring packet.
Chemical resistance
Polysorb disk springs are resistant to diluted alkalis and very weak acids as well as to fuels and all kinds of lubricants. The low humidity absorption allows their use in wet or humid environment.
| Medium | Resistance |
| Alcohol | + |
| Hydrocarbons | + |
| Fats, oils without additives | + |
| Fuels | + |
| Diluted acids | 0 to - |
| Strong acids | - |
| Diluted bases | + |
| Strong bases | + to 0 |
Humidity absorption
Polysorb disc springs absorb humidity. Thereby their mechanical properties alter. In the worst application that can be thought of - extremely long application in water - Polysorb disc springs still exhibit a maximum spring force of 10 N.
Increased operating temperature
Increased temperatures lead to the decline of stiffening in polymers. Polysorb disc springs exhibit a maximum spring force of 8 N even at the maximum permitted temperature of 80° C. The dependency of spring force on the ambient temperature is indicated in Figure 35.2.
Polysorb disc springs in endurance test
Figure 35.1: Experimental spring characteristic progression from the force proportion F/F1.0 and the spring deflection proportion S/h0 (S1.0 = H0 ), measured by JTEM-10
Figure 35.2: Influence of the ambient temperature on the spring force, measured on JTEM-10
Dimensions according to DIN 2093
| Part No.: | |
| De [mm]: | |
| Di [mm]: | |
| Part no. | Standard values: Spring deflections and spring forces | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| De | Di | t | h0 | S0,25 | F0,25 | S0,5 | F0,5 | S0,75 | F0,75 | F1,0 | M | |||
| [mm] | [mm] | [mm] | [mm] | [mm] | [N] | [mm] | [N] | [mm] | [N] | [N] | [g] | |||
 JTEM-05 |
10 | 5,2 | 0,5 | 0,25 | 0,06 | 1 | 0,13 | 2,4 | 0,19 | 3,6 | 5 | 0,04 | Upon request |  |
| JTEM-06 |
12,5 | 6,2 | 0,7 | 0,3 | 0,08 | 3 | 0,15 | 5,1 | 0,23 | 8 | 12 | 0,11 | Upon request | |
| JTEM-08 |
16 | 8,2 | 0,9 | 0,35 | 0,09 | 4 | 0,18 | 8 | 0,28 | 11 | 12 | 0,2 | Upon request | |
| JTEM-10 |
20 | 10,2 | 1,1 | 0,45 | 0,11 | 5 | 0,22 | 10 | 0,33 | 15 | 18 | 0,33 | Upon request | |
| JTEM-12 |
25 | 12,2 | 1,5 | 0,55 | 0,14 | 9 | 0,28 | 18 | 0,42 | 27 | 35 | 0,85 | Upon request | |
| JTEM-16 |
31,5 | 16,3 | 1,75 | 0,7 | 0,18 | 15 | 0,35 | 32 | 0,53 | 51 | 70 | 1,44 | Upon request | |
| JTEM-20 |
40 | 20,4 | 2,25 | 0,9 | 0,23 | 35 | 0,45 | 70 | 0,68 | 110 | 140 | 3,1 | Upon request | |
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Formula symbol, description and units:
| F | = Force |
| S | = Spring deflection |
| De | = Outer diameter [mm] |
| Di | = Inner diameter [mm] |
| t | = Thickness of the single disc [mm] |
| h0 | = Maximum downward deflection of spring [mm] |
| S0,25 | = 25% of the maximum downward deflection [mm] |
| F0,25 | = Spring force with 25% downward deflection [N] |
| S0,5 | = 50% of the maximum downward deflection [mm] |
| F0,5 | = Spring force with 50% downward deflection [N] |
| S0,75 | = 75% of the maximum downward deflection [mm] |
| F0,75 | = Spring force with 75% downward deflection [N] |
| F1,0 | = Spring force with 100% downward deflection [N] |
| M | = Weight of a single disc [g] |
igus® (UK) Ltd.
51 Caswell Road
Brackmills
Northampton
NN4 7PW
51 Caswell Road
Brackmills
Northampton
NN4 7PW
igus® contactTel: +44(0)1604 677240
Fax:+44(0)1604 677242 Send e-mail to igus®
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