Spring Characteristics and Force Tolerances of Gas Springs5502236
As opposed to most other types of springs, gas spring mounting bracket possess a built-in pretension force and a flat spring characteristic. Which means 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 causes 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's just a few the gas flow between your piston sides being allowed to pass through channels inside the piston through the stroke. Conventional gas springs use 'hydraulic damping', that 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 by the end position so long as the piston rod is incorporated in the downward direction.
Force tolerances when charging with gas along with other factors signify there might be variations in the force exerted by gas springs with similar nominal value.
The nominal values apply at 20° C, the temperature at which gas charging is carried out. Note that if the ambient temperature rises or falls, the force of the spring rises or falls depending on pressure changes in the cylinder. As a rule of thumb, gas spring force increases by approximately 3.5% per 10° C temperature increase and reduces accordingly once the temperature falls.