公开(公告)号：US20170320567A1

公开(公告)日：2017-11-09

申请号：US15432910

申请日：2017-02-14

Applicant: Bell Helicopter Textron Inc.

Inventor： Gary Miller ,  Frank B. Stamps ,  Jouyoung Jason Choi ,  Thomas C. Parham, JR. ,  Alan Ewing ,  Richard E. Rauber

IPC: B64C27/635 ,  B64C27/605 ,  B64C27/72

CPC classification number: B64C27/635 ,  B64C27/33 ,  B64C27/605 ,  B64C27/72 ,  B64C29/0033 ,  B64C2027/7255

Abstract: An aircraft rotor assembly has a central hub and a plurality of rotor blades coupled to the hub for rotation with the hub about an axis, each blade having a Lock number of approximately 5 or greater. A lead-lag pivot for each blade is formed by a flexure coupling the associated blade to the hub. Each pivot is a radial distance from the axis and allows for in-plane lead-lag motion of the associated blade relative to the hub, each pivot allowing for in-plane motion from a neutral position of at least 1 degree in each of the lead and lag directions. Elastic deformation of the flexure produces a biasing force for biasing the associated blade toward the neutral position, and the biasing force is selected to achieve a first in-plane frequency of greater than 1/rev for each blade.

公开(公告)号：US10472057B2

公开(公告)日：2019-11-12

申请号：US15432910

申请日：2017-02-14

Applicant: Bell Helicopter Textron Inc.

Inventor： Gary Miller ,  Frank B. Stamps ,  Jouyoung Jason Choi ,  Thomas C. Parham, Jr. ,  Alan Ewing ,  Richard E. Rauber

IPC: B64C27/635 ,  B64C27/605 ,  B64C27/72

Abstract: An aircraft rotor assembly has a central hub and a plurality of rotor blades coupled to the hub for rotation with the hub about an axis, each blade having a Lock number of approximately 5 or greater. A lead-lag pivot for each blade is formed by a flexure coupling the associated blade to the hub. Each pivot is a radial distance from the axis and allows for in-plane lead-lag motion of the associated blade relative to the hub, each pivot allowing for in-plane motion from a neutral position of at least 1 degree in each of the lead and lag directions. Elastic deformation of the flexure produces a biasing force for biasing the associated blade toward the neutral position, and the biasing force is selected to achieve a first in-plane frequency of greater than 1/rev for each blade.