Frequency adapter and return means suitable for being arranged in such a frequency adapter

摘要

A frequency adapter for a rotorcraft rotor is provided. The frequency adapter has at least first and second cylinders having respective elongate first and second side walls, respectively. The second cylinder is surrounded at least in part by the first cylinder. Resilient return rings are in contact with the first and second side walls. The return rings comprise resilient first and second extreme layers each in contact with the first and second side walls. The adapter is provided with a fluid arranged in a single chamber between the first and second extreme layers.

主权项

1. A rotor aircraft comprising:
a rotator hub; a rotor having a plurality of rotor blades connected to the rotor hub; a frequency adapter connected between the rotating hub and at least one of the purality of rotor blades, the frequency adapter including:
a first elongate cylinder, attached to one of a rotating hub and the rotor blade, wherein the first cylinder has at least one end open and a second end closed by a plug;a second elongate cylinder attached to the other of the rotating hub and the rotor blade and arranged concentrically within first cylinder;first and second resilient rings disposed between the first and second cylinders, wherein the first and second resilient rings have a dampening stiffness adapted to absorb frequency vibrations from the second cylinder and thereby minimize transmission of the vibrations to the first cylinder;a single closed fluid chamber defined between the first and second cylinder and the first and second resilient rings, wherein the single closed fluid chamber is not in fluid communication with another chamber defined between the first and second cylinders; andan indicator liquid disposed in the single fluid chamber, wherein the liquid is capable of indicating at least one of the resilient rings having a crack that requires the adapter to be replaced, wherein the liquid includes an indicator color being visually distinguishable in contrast to a color of the rotor aircraft and detectable when the liquid having the indicator color escapes through the open end and is located outside of the frequency adapter thereby indicating the crack in one of the resilient rings requires the frequency adapter to be replaced.