公开(公告)号：US20180162519A1

公开(公告)日：2018-06-14

申请号：US15375385

申请日：2016-12-12

Applicant: Bell Helicopter Textron Inc.

Inventor： Thomas Clement Parham, JR. ,  Jouyoung Jason Choi ,  Gary Miller ,  Frank Bradley Stamps ,  Richard Erler Rauber

IPC: B64C11/06 ,  B64C29/00

Abstract: A soft-in-plane proprotor system for a tiltrotor aircraft having a helicopter mode and an airplane mode. The proprotor system includes a hub, a plurality of proprotor blades and a plurality of loop yokes, each coupling one of the proprotor blades with the hub and each including first and second longitudinal sections extending between inboard and outboard arcuate sections and a bearing assembly disposed between the inboard and outboard arcuate sections of each loop yoke. Each bearing assembly includes a flapping bearing disposed generally within the inboard arcuate section of the respective loop yoke and coupled to the hub, a lead-lag damper coupled to the hub, a centrifugal force bearing disposed generally within the outboard arcuate section of the respective loop yoke and a blade anchor coupled between the lead-lag damper and the centrifugal force bearing. The blade anchor is also coupled to the respective proprotor blade.

公开(公告)号：US20180162518A1

公开(公告)日：2018-06-14

申请号：US15375356

申请日：2016-12-12

Applicant: Bell Helicopter Textron Inc.

Inventor： Thomas Clement Parham, JR. ,  Jouyoung Jason Choi ,  Gary Miller ,  Frank Bradley Stamps ,  Richard Erler Rauber

IPC: B64C11/04 ,  B64C29/00 ,  B29C70/32

Abstract: A yoke for providing a centrifugal force retention load path between a proprotor blade and a hub of a soft-in-plane proprotor system operable for use on a tiltrotor aircraft. The yoke includes a continuous loop having a longitudinal axis and first and second longitudinal sections extending between inboard and outboard arcuate sections. A flapping bearing receiving region is disposed at least partially within the inboard arcuate section to an interior of the continuous loop. A centrifugal force bearing receiving region is disposed at least partially within the outboard arcuate section to the interior of the continuous loop. The continuous loop is formed from a composite material having a plurality of double bias material plies and a plurality of unidirectional material plies such that the number of unidirectional material plies is greater than the number of double bias material plies.

公开(公告)号：US20180141654A1

公开(公告)日：2018-05-24

申请号：US15355347

申请日：2016-11-18

Applicant: Bell Helicopter Textron Inc.

Inventor： Jouyoung Jason Choi ,  Gary Miller ,  Richard Erler Rauber ,  Thomas Clement Parham, JR. ,  Alan Carl Ewing ,  Frank Bradley Stamps

IPC: B64C29/00 ,  B64C27/41 ,  B64C27/54 ,  B64C27/473

Abstract: A proprotor system for tiltrotor aircraft having a helicopter mode and an airplane mode. The proprotor system includes a hub and a plurality of proprotor blades coupled to the hub such that each proprotor blade is operable to independently flap relative to the hub and independently change pitch. In the airplane mode, the proprotor blades have a first in-plane frequency greater than 2.0/rev.