Patent ID: 8899928
Filing Date: 2014-12-02
Classification: B64C,Y10S

Abstract:
1. 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, wherein 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 that is movable perpendicularly to an elevation axis of said device, said connection means including resilient return means serving to allow said filter plane to move in elevation while keeping the filter plane perpendicular to said elevation axis under the effect of said vibration; wherein said guide means comprise a first link and a second link; wherein said first link is fastened to said connection means by a first primary connection member allowing said first link to move in rotation about a first primary axis of rotation, said first link being fastened to said weight element by a first secondary connection member allowing said first link to move in rotation about a first secondary axis of rotation, said second link being fastened to said connection means by a second primary connection member allowing said second link to move in rotation about a second primary axis of rotation, said second link being fastened to said weight element by a second secondary connection member allowing said second link to move in rotation about a second secondary axis of rotation, said first and second primary axes of rotation and said first and second secondary axes of rotation being mutually parallel; and wherein at least one primary connection member includes a primary fastener pin co-operating with a primary rotary member.