Airbus Helicopters

Eurocopter

Vincent Girard

Stéphane Mazet

Charles Louis

Alain Eberhard

Rémi Metivier

Arnaud Varin D'Ainvelle

Stephane Mazet

A frequency adapter for a rotorcraft rotor is provided. The frequency adapter has at least first and second cylinders having respective elongate first and second side walls, respectively. The second cylinder is surrounded at least in part by the first cylinder. Resilient return rings are in contact with the first and second side walls. The return rings comprise resilient first and second extreme layers each in contact with the first and second side walls. The adapter is provided with a fluid arranged in a single chamber between the first and second extreme layers.

Frequency adapter and return means suitable for being arranged in such a frequency adapter

A device () for reducing the vibration of a rotorcraft main rotor () provided with a hub () and a plurality of blades, said device having a support () together with at least one weight element (). Said weight element () is fastened to said support () by connection means (), and said weight element () is connected to said connection means () by guide means () for guiding said weight element () in movement in circular translation in a filter plane (P) that is movable perpendicularly to an elevation axis (AX) of said device (), said connection means () including resilient return means () serving to allow said filter plane (P) to move in elevation while keeping the filter plane (P) perpendicular to said elevation axis (AX) under the effect of said vibration.

Device for reducing the vibration generated by a rotorcraft lift rotor, and a rotor hub provided with such a device

A set () of cyclic swashplates () for controlling the pitch of blades () of a main rotor () of a rotorcraft. The set includes a non-rotary swashplate () retained against rotation about an axis of rotation (AX) and a rotary swashplate () suitable for rotating about the axis of rotation (AX). The set () also includes drive means () with a drive arm () and an annular linear connection means () secured to the rotary swashplate (). A first end () of the drive arm () is connected to the rotary swashplate () by the annular linear connection means (). A second end () of the drive arm () is connected to a rotor mast () by slideway connection means () of the drive means ().

Set of cyclic swashplates for controlling the pitch of blades of a main rotor, and a rotor provided with such a set

A concentrated-mass device including a main oscillating mass held radially in a horizontal plane by main resilient means inside a casing suitable for being secured to the hub is provided. The device includes a secondary main oscillating mass suspended by secondary resilient means inside a recess in said main oscillating mass to oscillate along a vertical axis perpendicular to the horizontal plane, the secondary oscillating mass being constrained to move in translation together with the main oscillating mass in the horizontal plane.

Concentrated-mass device for reducing vibration generated by a rotorcraft lift rotor, and a rotor hub fitted with such a device

The present invention relates to a rotorcraft blade () provided with at least one spar () and an outer covering (), said blade () including a hollow sleeve () with a wall () that is provided at least with said outer covering () secured to said spar (). The blade includes a rotary damper () provided with an inner tubular strength member () and an outer tubular strength member () that are coaxial and connected together by a ring () of viscoelastic material, said inner tubular strength member () being secured to said covering (), and said outer tubular strength member () being provided with a fork () possessing first and second tines () facing each other so as to be suitable for receiving a first ball joint () close to the pitch-variation axis (AX) of said blade ().

Blade provided with a drag damper, and a rotor provided with such a blade

A distributed mass device for reducing the vibration generated by a rotor, includes a support suitable for being constrained in rotation about an axis of rotation of the lift rotor. The distributed mass device further includes at least two main oscillating masses each provided with a through longitudinal recess, and each being connected to the support by respective deformable elements, the main oscillating masses being constrained to move solely in a horizontal plane by the deformable elements. The distributed mass device is provided with a secondary oscillating mass per main oscillating mass, each secondary oscillating mass being suspended inside the recess of the associated main oscillating mass by resilient elements.

Growing community of inventors

Venelles, France

Vincent Girard