The present invention relates to a rocking device comprising at least one of the motorized element (20) which is intended to be transmitted by contact with a pair of shakers to a set of channels, said element having at least one structural insert (22, 24) which is surrounded by an envelope of wear (23), said insert comprising a structural reinforcement included in a matrix which is coated with the envelope (23), said matrix being made on the basis of a material which is different from that of the envelope (23) being designed to adhere to the reinforcement and the material of the envelope (23).Linvention concerne un dispositif de secouage comprenant au moins un organe motorisé (20) qui est destiné à transmettre par contact un couple de secouage à un ensemble à secouer, ledit organe présentant au moins un insert structurel (22, 24) qui est enrobé par une enveloppe dusure (23), ledit insert structurel comprenant un renfort inclus dans une matrice qui est enrobée par lenveloppe (23), ladite matrice étant réalisée à base dun matériau qui est différent de celui de lenveloppe (23) en étant agencé pour adhérer au renfort et au matériau de lenveloppe (23).
