Device with concentrated masses for reducing the vibration caused by a lift rotor of a rotorcraft, and hub of a rotor provided with such a device

摘要

The device has a rod (40) extending longitudinally along a rotation axis of a lift rotor and a hub such that a lower end of the rod is articulated inside a rotor mast of the rotor. A secondary oscillating mass (50) is suspended within a recess (11) of a main oscillating mass (10) along a vertical axis (AX1) perpendicular a horizontal plane (P) by elastic units (60). The secondary oscillating mass is secured to the main oscillating mass in translation in the horizontal plane. An independent claim is also included for a hub for a lift rotor of a rotorcraft, comprising an upper zone integrated to an envelope of a vibration reducing device.