While gas springs and hydraulic dampers, specialized types of springs that utilize gas under compression to exert force, are produced in various sizes and lengths, selecting one depends upon two main factors, the required spring force as well as the effective stroke of the spring. Application design considerations of the gas springs involves selecting springs with the right sized cylinder and piston based on the force required for the application. For instance, the trunk lid of a car is supported by two gas springs on either side of the lid, which when compressed produce a force which is roughly comparable to the weight of the lid. Similarly for an office chair, the force created by the gas lift should be a little greater than the weight of the chair, allowing the user to effortlessly move the chair down and up. Furthermore, to prevent buckling the buckling of the gas springs, the force produced should be in line with its centerline, particularly for a slender gas spring device.
Another thing to consider while selecting or designing Gas Spring Bracket is the ambient operating temperature, as both extreme cold and warm temperatures impact the operation. The change in temperature affects pressure that a gas spring can exert and consequently the output force. At extremely high temperatures, the seal permeability increases and gas molecules may escape with the seal more easily. Also, they are designed based on the performance guidelines which include cold closing and opening efforts, hot closing and opening efforts, self-rise and self-close angle, hump, room temperature, and damping.
Contrary to most other types of springs, gas springs possess a built-in pretension force along with a flat spring characteristic. Which means that there is only a small difference in force between full extension and full compression.
Since the piston and piston rod are pressed to the cylinder, volume reduces and pressure increases. This will cause pushing force to improve. In conventional gas-type springs, this increase is generally around 30% at full compression.
The pushing spring movement is slow and controlled. It is reliant on the gas flow in between the piston sides being able to go through channels in the piston during the stroke. Conventional gas springs use ‘hydraulic damping’, which involves a tiny amount of oil slowing down the pace from the stroke immediately before the spring reaches full extension. This offers the movement a braking character in the end position so long as the piston rod is within the downward direction.
Effectiveness against dents, damage, and abrasion also need to be ensured while designing the cylinder and also the piston. Special features, including external locking and variable damping, also need to be considered. Safety factors are another major factor that needs to be considered while producing gas springs. As a part of this factor, the suitability in the spring and also the sldvml position strength are taken into account. Furthermore, a secondary locking mechanism can be incorporated for safety purposes, if required.
While mounting a gas spring, care should be taken to ensure they are mounted inside an upright fashion with the piston rod pointed downwards. This is to ensure that the rod seal is kept lubricated all the time. If the spring is to be mounted in an angle, care ought to be taken to make sure that the level of the lubricating oil is enough for the rod seal to get always lubricated throughout the operation.