Patent ID: 9352830
Filing Date: 2016-05-31
CPC Classification: B64C

Claim Text:
1. An aircraft rotor assembly, comprising: a lower hub plate, comprising a cylinder located centrally; an upper hub plate, comprising a ring located centrally, the ring configured for coupling the upper hub plate to the cylinder of the lower hub plate; the upper and the lower hub plates adapted to be mounted to a central rotor mast for rotation therewith; a plurality of radial arms, each arm being connected to at least two flap bearings mounted between the hub plates and forming a discrete flap hinge, each flap hinge defining a flap axis and allowing rotation of the associated arm relative to the hub plates and about the corresponding flap axis; and a plurality of blade grips, each grip being rotatably connected to one of the arms for rotation about a pitch axis and adapted for mounting of a blade to each blade grip, such that each blade is capable of rotation with the grip about the pitch axis and capable of rotation together with the corresponding arm relative to the hub plates and about the corresponding flap axis; wherein the at least two flap bearings are rigidly mounted directly to the upper hub plate and the lower hub plate; and wherein the at least two flap bearings rotate with the upper and lower hub plates.