Gas springs (Gas Struts) make life easier to all of us. Most people are not even aware how often they have contact with gas springs. These products accompany us in everyday life each time we use cars, kitchen furniture, busses, roof windows etc. They are often used by agricultural machines. Gas springs are always used in places where certain force is required for i.e. lifting flaps, covers, opening doors. They cause that force required from a man is minimized and the movement is more smooth and under control. However, gas springs are the most commonly used in car tailgates and hoods. Nowadays, most cars are equipped in at least two gas springs.

How does it work:

Gas Springs are made as set of pressure gas cylinder and piston rod with wide variety of fitting ends depending on mounting and type of work. The gas spring's force (F1) corresponds to the nitrogen pressure in a cylinder multiplied by surface of piston rod section.

a - piston rod mounting length (mm)
b - cylinder mounting length (mm)
S - stroke (mm)
F1 - extension force with extended piston rod
F2 - extension force with compressed piston rod
F3 - pull-in force with extended piston rod
F4 - pull-in force with compressed piston rod
Fr - friction force = F3-F1
1 - piston rod
2 - washer
3 - rod guide
4 - seal
5 - spacer
6 - piston
7 - piston ring
8 - washer retainer
9 - cylinder
10 - oil + gas N2
h - hydraulic damping
p - pneumatic damping
C - compression
E - extension
T - damping
W - center of gravity
G - flap weight in newtons (N)
K - distance from hinge to center of gravity (mm)
r - vertical distance bearing (mm)
X - number of gas springs (usually 2 pieces - recommended)
Ød - piston rod diameter