Spring Characteristics and Force Tolerances of Gas Springs2971118
In contrast to most other types of springs, strut bracket have a built-in pretension force plus a flat spring characteristic. Which means that there is merely a small alteration in force between full extension and full compression.
Since the piston and piston rod are pressed in to the cylinder, volume reduces and pressure increases. This will cause 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 reliant on the gas flow between your piston sides being allowed to go through channels within the piston through the stroke. Conventional gas springs use 'hydraulic damping', that involves a tiny bit of oil reducing the rate of the stroke immediately prior to the spring reaches full extension. This provides the movement a braking character at the conclusion position so long as the piston rod is within the downward direction.
Force tolerances when charging with gas and other factors mean that there may be variations in the force exerted by gas springs with the exact same nominal value.
The nominal values apply at 20° C, which is temperature of which gas charging is completed. Remember that if the ambient temperature rises or falls, the force from the spring rises or falls according to pressure modifications 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.