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| Force diagramme/
measuring points |
| The theoretical extension force is calculated filling pressure multiplied by the cross section of the piston rod. By changing these two factors, it is possible for Bansbach to supply gas springs with any requested extension force. Our standard specifications are available from 10N to 5000N. The extension force is always mentioned with the specification and relates to the value F1 measured at 20°C ± 2°C with the piston rod showing downwards.
F1 = extension force with
extended piston rod
F2 = extension force with
compressed piston rod
F3 = pull-in force with extended
piston rod
F4 = pull-in force with
compressed piston rod
FR = friction force
These values can be influenced, e.g. by the gas volume or the oil quantity. A special characteristic of Bansbach gas springs is the low friction figure.
Through the combinations of different nozzle orifices and oil quantity, its possible to control the push-out and push in speed as required.
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| Calculation principle F1 |
| Calculation principle of the extended force F1 S = Centre of gravity
G =Weight of the flap in N (approx. Kp x 10)
b = Power arm (corresponds to about
85% of the required stroke)
X = Number of the springs
(in general 2 pieces, one for each side of the flap) Our general extension force tolerance is +40N/-20N or ± 5-7%. Physically, the actual force of a gas spring depends on the temperature. For each 10°C, the force changes by approx 3,3%. Size and extension force can be made according to your requirements. We would be pleased to help you to design a gas spring for your application. |
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