Airbus Helicopters

Eurocopter

Stéphane Mazet

Vincent Girard

Alain Eberhard

Rémi Metivier

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 ().

Growing community of inventors

Munich, Germany

Stéphane Mazet