Gantry Rail s.r.o.

Bavorská 856
CZ –155 41  Praha 5

Phone:  +420-224 453 530
Fax: +420-251 610 273



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Industrial absorption of energy


Typical examples of application:

Steel works
Rolling mills
Container transhipment units

Sea boring sets    
Terminal arresters and stops



The hydraulic-gas principle offers the best way to “destroy” the excessive energy.
For over 50 years of international activity, OLEO has been in the leading world position.

OLEO hydraulic-gas buffers

OLEO hydraulic-gas buffers are the most economical.

Optimally protect equipment
Decrease the risk of accident, injury or collision
Decrease maintenance costs
Equipped with the highest precision
Long service life
Wide application
Require minimum maintenance

How does the OLEO hydraulic-gas buffers?

The hydraulic-gas uffers consists of (as can be seen in the diagram): a cylinder and piston filled with hydraulic oil and nitrogen. The hydraulic oil is separated from the nitrogen by a movable piston (Kolben).
When the piston (Plunger) encounters an obstacle, this piston is suppressed into the cylinder. The suppressed hydraulic oil glows through the very precisely stated throttling hole (Drossel) from chamber A into chamber B. By increasing the content of chamber B, the movable piston (Kolben) is suppressed in the direction of the shocks. This causes compression of the nitrogen. The compressed nitrogen takes the task of the spring, however, unlike the spring, without any expression of material fatigue.
After removing an obstacle, the pressure originated in the nitrogen chamber is transferred through the piston (Kolben) to the hydraulic oil. It flows through the throttling hole back to chamber B and the piston (Plunger) is suppressed into the original position.
The final forces which are transferred into the related construction must be restricted to the minimum. This can be achieved by the correct above-dimensioning of the concrete regulation drift (Dorn), which regularly reduces the area of the flowing hole. The remaining forces which are transferred into the surrounding construction, minimally affect.

  • The construction and the OLEO output buffers always correspond to the specific requirements of the client.
  • OLEO buffers are delivered in various special constructions either with special sealing for operation at high temperatures, damp environments or a construction with protective bags for aggressive environments.
  • Service and consulting for special cases in various areas of use is a matter of course

OLEO hydraulic-gas buffers – compared with other damping systems

Impact energy

is kinetic energy for the moving body and is equal to the work to put the body into ab inactive status.
Ekin = m/2 x V(na 2)
The energy output of the buffers must always be equal or greater than the impact energy.


Reflection energy

is energy which, at the pressed buffers, is accumulated and in the case of relocation of the buffers into the original position, is released again.

Absorbed energy

is the value of impact energy which is absorbed and/or converted to heat. It is possible to ascertain the absorbed energies from the different values between the impact and reflection energy. The energy capacity of the hydraulic buffers is the function of the lift, force and efficiency. The value of the level of damping in percentages is stated by the ratio of the real course of the power diagram to the rectangular area bordered by the final force values and the lift of the buffers. In an ideal scenario, the damping curve can be displayed in rectangular form. However, such a course does not correspond to practical conditions. The damping is the ratio of the received work We to the executed work Wa. In the case of the correct construction of the regulating drift, the efficiency of the OLEO hydraulic buffers is higher than 90%.

Hydraulic buffers compared with other damping systems

1. rubber buffers
2. spring buffers
3. hydraulic buffers

Constant lift

During the same lift the final force increases in the reverse ratio to the efficiency of the shock

Constant final force

In the case of the same final force, the lift in the buffers must be increased in the reverse ratio to the efficiency.

Maximum permitted bevelled shock
avg. head
 see prospect
21 100 70
4 140/330 120
(9) 50 + 70 140 100
50 180
(9) 70 200 120
(15) 78 + 700 200 100
The OLEO hydraulic buffers is constructed for operating temperatures from -40° to +80 °C. It is possible to briefly exceed the maximum operating temperature for the standard construction of the buffers. If the ambient temperature varies in the area above 70 °C, we recommend using high-temperature sealing which enables operation within the range +80° to 120 °C. If at these higher temperatures there is a high frequency of shocks, consulting is necessary with the supplier.



© 2011 Gantry Rail s.r.o., created: G66 s.r.o.