公开(公告)号：US20190176980A1

公开(公告)日：2019-06-13

申请号：US15834340

申请日：2017-12-07

Applicant: Bell Helicopter Textron Inc.

Inventor： Albert G. Brand ,  Mark Loring Isaac ,  Frank Bradley Stamps ,  Russell Lee Mueller

IPC: B64C29/00 ,  B64C11/28 ,  B64D35/06 ,  F16H48/10 ,  B64C27/54

CPC classification number: B64C29/0033 ,  B64C11/28 ,  B64C11/48 ,  B64C27/28 ,  B64C27/30 ,  B64C27/54 ,  B64D35/06 ,  F16H48/10

Abstract: A dual rotor propulsion system for a tiltrotor aircraft having VTOL and forward flight modes. The dual rotor propulsion system includes an engine operable to provide an input torque to a transmission that, responsive thereto, generates an output torque. A first output shaft is coupled to the transmission and is operable to receive a first portion of the output torque. A first rotor assembly is coupled to and rotatable with the first output shaft. A second output shaft is coupled to the transmission and is operable to receive a second portion of the output torque. A second rotor assembly is coupled to and rotatable with the second output shaft. In operation, the first and second rotor assemblies rotate coaxially, the first rotor assembly is a different diameter than the second rotor assembly and the first rotor assembly is stoppable and foldable in the forward flight mode.