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Oleo Hydraulic Principle

The illustration shows the robust construction of the Oleo elevator hydraulic buffer unit. On impact the plunger is forced down around the gas rod and through the metering tube displacing oil through holes, thereby decelerating the impact mass. Following impact the gas hydraulic buffer returns to its full height using a unique method of moving the gas within the chamber

Oleo Hydraulic Principle

The buffers performance on impact relies solely on oil displacement, the gas spring serves only to re-extend the plunger. When the plunger is forced into the cylinder rapidly the oil displaced by the plunger has to pass through the metering holes at very high velocity. This raises the pressure in the oil chamber to a level which optimises the closure force of the unit.

This very useful feature is accomplished by Oleo's innovative metering designs which progressively alter the flow area as the unit closes. The actual metering designs are precisely calculated to provide the best possible protection.

The Oleo hydraulic unit therefore possesses the unique feature that its characteristics change according to operational needs. The majority of the impact energy is absorbed within the unit and the already low recoil force is damped by the reverse flow of oil, leaving very little energy and recoil force to be returned to the impacting vehicle


Oleo has a complete range of elevator buffers for every application offering a high quality product with minimum life-cycle costs.

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Fitting efficient and effective end stop solutions will protect passengers, rolling stock and infrastructure in the event of a train failing to stop.

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Oleo provides crash energy management products and services to rail operators and train manufacturers. Over 1,000,000 Oleo hydraulic and deformation impact energy absorbers are in daily operation around the world; meeting the requirements for higher levels of protection for passenger and freight rolling stock and operating needs such as higher coupling speeds.

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