Antivibration supports for helicopter blades, and a helicopter rotor including such supports

A helicopter rotor including a hub having an axis of rotation and blades fixed to the hub and extending along a longitudinal axis substantially perpendicular to the axis of rotation, each blade being fixed to the hub via at least one antivibration device comprising:

• first and second rigid strength members, each of said strength members having a bearing face facing the other rigid strength member, the two bearing faces being disposed opposite each other and perpendicularly to a first axis;
• at least one laminated element interposed between the two bearing faces, said laminated element having two opposite faces secured to respective bearing faces, said laminated elements comprising alternating layers of rigid material and elastomer disposed perpendicularly to the first axis, said laminated element being deformable for permitting relative displacement of the two strength members along a second axis perpendicular to the first axis;
• and
• a hydraulic damper having at least two deformable leakproof chambers interconnected by a narrow channel, the two leakproof chambers and the narrow channel being filled with a liquid, at least a portion of each leakproof chamber being delimited by a deformable wall extending between a first end secured to the first strength member and a second end secured to the second strength member, said deformable wall, on deforming, permitting relative movement of said first and second ends parallel to the second axis;
• one of the strength members of said antivibration device
• being secured to the hub and the other strength member being secured to the respective blade, the first axis of the antivibration device being parallel to the axis of rotation of the hub, and the second axis of said antivibration device being parallel to the longitudinal axis of the blade.