Airbus Helicopters

Eurocopter

Cédric Lopez

Benjamin Talon

Vincent Lassus

Damper device for damping relative movements of two elements of a mechanical system. The damper device comprises a damping chamber filled with a hydraulic fluid, a rod () having a piston () movable in the damping chamber so as to define two hydraulic compartments (), at least one calibrated orifice () provided in the piston () for throttling the hydraulic fluid flowing from one hydraulic compartment () to another hydraulic compartment, at least one compression peak-limiting valve () and a traction peak-limiting valve (), throttling the hydraulic fluid flowing from one hydraulic compartment () to another hydraulic compartment. The damper has additional hydraulic means that are active in compression and in traction when the piston () reaches the end of its stroke, so as to constitute a progressive hydraulic abutment damping the end-of-stroke jolts.

Lead-lag damper device to limit an end-of-stroke force peak

A damper () is provided with a body () which surrounds an annular compression chamber (), the damper () being furnished with at least one pneumatic compensation chamber () and a control piston () that can move relative to the body (), the control piston () having a rod () which protrudes from the body () and a head () which slides in the compression chamber (). The damper is notable in that, the compression chamber () comprising a variable-section radial opening (), the damper () is provided with a hydraulic compensation chamber () which receives a first fluid expelled from the annular compression chamber () via the variable-section radial opening () when the control piston () moves.

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Chateauneuf les Marigues, France

Cédric Lopez