Spring Characteristics and Force Tolerances of Gas Springs1281873
As opposed to most other types of springs, 10mm ball stud have a built-in pretension force and a flat spring characteristic. This means that there is only a small improvement in force between full extension and full compression.
Because the piston and piston rod are pressed to the cylinder, volume reduces and pressure increases. This makes pushing force to increase. In conventional gas-type springs, this increase is normally around 30% at full compression.
The pushing spring movement is slow and controlled. It is reliant on the gas flow between the piston sides being allowed to go through channels within the piston through the stroke. Conventional gas springs use 'hydraulic damping', which involves a modest amount of oil slowing down the speed of the stroke immediately prior to the spring reaches full extension. This provides the movement a braking character at the end position provided the piston rod is within the downward direction.
Force tolerances when charging with gas as well as other factors imply that there might be variations inside the force exerted by gas springs with similar nominal value.
The nominal values apply at 20° C, which is temperature where gas charging is carried out. Observe that when the ambient temperature rises or falls, the force from the spring rises or falls based on pressure alterations in the cylinder. Usually of thumb, gas spring force increases by approximately 3.5% per 10° C temperature increase and reduces accordingly when the temperature falls.