Calculations Gas Springs - Strack PowerMax SN5650-PMU-0330 Bedienungsanleitung

PowerMax cam unit SN5650-PMU-0330 — SN5650-PMU-1200

15.4 Calculations gas springs

Inital force
Gas spring initial force is calculated in relation with the working surface and loading force in accordance with
the following formula:
Fi = A x P
Variation of the initial force
Loading pressure may be modified to vary the initial force of a gas spring.
If we know the initial force, we can use the following formula:
P = Pi x ___
Variation of forces depending on the temperature
Gas temperature affects the pressure of gas springs and therefore also their force. The forces specified in the
catalogue correspond to loading pressures at a temperature of 20°C. In the temperature/pressure graph it is
possible to see how nitrogen pressure varies according to the temperature.
Technical advice
With the purpose of helping our customers we have a technical advice service. By means of this service, you
will receive advice from specialised technicians, and all your queries will be answered. We will help you chose
the most adequate product depending on the type of work you wish to carry out.
Garantee and duration
The guarantee that STRACK offers in gas springs is for one year as from the date of acquisition, or the equi-
valente to a stem lineal displacement of 100,000 metres in gas springs with strokes equal to or over 25 mm.
whereas in gas springs with shorter strokes the guarantee is of 2,000,000 cycles.
The guarantee (which covers parts and labour costs) is applicable if and when the following conditions are fulfilled:
1. T he gas springs does not present defects due to dents (blows, scratches, welding detatchments, rust and so on..).
2. T heir application and use has been strictly within the limits of the technical conditions specified, and of the various
applocable recommendations.
3. T he gas spring has not been manipulated (opening the gas spring cancels the guarantee).
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STRACK NORMA GmbH & Co. KG · Königsberger Str. 11 · D-58511 Lüdenscheid · Tel +49 2351 8701-0 · www.strack.de
Fi = I nitial nominal force in daN
A = W orking area in cm
(as detailed in the speficactions of each model)
2
P = Loading pressure in Bar
F
P = P ressure wanted (Bar), Pi = G as spring nominal loading pressure (Bar)
Fi
F = Required initial force (daN), Fi = Gas spring nomilal initial force (daN)
185
180
175
170
165
160
155
150
145
140
0 10 20 30 40
Temperatur / Temperature (°C)
I
Operating instructions -- PowerMax cam unit PMU
50 60 70 80 90
PowerMax