Spring Characteristics and Force Tolerances of Gas Springs9307282
In contrast to almost every other type of springs, gas spring ball stud use a integrated pretension force along with a flat spring characteristic. Which means there is merely a small improvement in force between full extension and full compression.
Because the piston and piston rod are pressed in to the cylinder, volume reduces and pressure increases. This causes pushing force to boost. In conventional gas-type springs, this increase is generally around 30% at full compression.
The pushing spring movement is slow and controlled. It's dependent on the gas flow between the piston sides being able to move through channels in the piston throughout the stroke. Conventional gas springs use 'hydraulic damping', which involves a small amount of oil slowing the pace of the stroke immediately before the spring reaches full extension. This gives the movement a braking character at the end position provided that the piston rod is 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, which is the temperature of which gas charging is carried out. Note that if the ambient temperature rises or falls, the force from the spring rises or falls depending on pressure modifications in the cylinder. Usually of thumb, gas spring force increases by approximately 3.5% per 10° C temperature increase and reduces accordingly once the temperature falls.