Rotor blade subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B64C-027/33
출원번호
US-0903061
(1992-06-22)
발명자
/ 주소
Krauss Timothy A. (Harwinton CT) Hunter David H. (Cheshire CT) Beatty Robert D. (Trumbull CT)
출원인 / 주소
United Technologies Corporation (Hartford CT 02)
인용정보
피인용 횟수 :
21인용 특허 :
0
초록▼
A rotor blade subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors includes a flexbeam, an integrated torque tube/spar member, and an aerodynamic fairing or rotor blade. The flexbeam is a laminated composite structure that reacts centrifugal loads and a majority of the ben
A rotor blade subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors includes a flexbeam, an integrated torque tube/spar member, and an aerodynamic fairing or rotor blade. The flexbeam is a laminated composite structure that reacts centrifugal loads and a majority of the bending loads of the rotor assembly. The flexbeam has a spanwise predetermined linear twist so that the pretwisted flexbeam is unstrained during specified forward flight conditions. The integrated torque tube/spar member is formed as a continuous, filament wound tubular composite structure having high torsional and bending stiffness that provides a continuous torsional load path and facilitates load coupling between the rotor blade and the pretwisted flexbeam. The spar segment of the functions as the primary structural member of the rotor blade subassembly and, is operative to react all bending, torsional, shear, and centrifugal dynamic loads of the rotor assembly. The torque tube segment reacts all torsional loads and some of the bending loads of the rotor assembly. The rotor blade is fabricated from a high modulus composite material and has a high aerodynamic taper such that the tapered rotor blade has a low outboard mass, a high inboard stiffness, and a high chordwise frequency. The high chordwise frequency allows the rotor assembly to be operated over a weaker modal response zone. The tapered rotor blade includes a triangularly shaped trailing edge segment that is responsive to the aerodynamic pressures encountered during operation of the shrouded counter-rotating rotors.
대표청구항▼
A rotor blade subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors, the rotor assembly including a rotor hub, comprising: flexbeam means for reacting centrifugal and bending loads of one of the ducted, coaxial counter-rotating rotors, said flexbeam means having an inboard
A rotor blade subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors, the rotor assembly including a rotor hub, comprising: flexbeam means for reacting centrifugal and bending loads of one of the ducted, coaxial counter-rotating rotors, said flexbeam means having an inboard end and an outboard end, said flexbeam means being secured in combination with the rotor hub by means of said inboard end, said flexbeam means having a predetermined linear twist along the span thereof from said inboard end to said outboard end; spar means for reacting bending, torsional, shear, and centrifugal loads of the one ducted, coaxial counter-rotating rotor, said spar means functioning as a primary structural member of said rotor blade subassembly; torque tube means for reacting torsional and bending loads of the one ducted, coaxial counter-rotating rotor; and a rotor blade; said rotor blade, said torque tube means, said spar means, and said flexbeam means being secured in combination at said outboard end of said flexbeam means.
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이 특허를 인용한 특허 (21)
Beckman, Brian C.; Haskin, Menashe; Kalyan, Atishkumar; LeGrand, III, Louis LeRoi; Rolnik, Michael; Welsh, Ricky Dean, Circumferentially-driven propulsion mechanism.
Darrow, Jr., David A.; Bertolotti, Fabio P.; Sbabo, Thomas L.; D'Anna, Frank P., De-rotation system for a counter-rotating, coaxial rotor hub shaft fairing.
Suciu, Gabriel L.; Sharma, Om P.; Portlock, Lawrence E.; Merry, Brian D.; Magge, Shankar S., Low pressure turbine with counter-rotating drives for single spool.
Bertolotti, Fabio P.; Scott, Mark W.; Wake, Brian E.; Egolf, T. Alan; McCormick, Duane C.; Usta, Ebru; Ochs, Stuart S., Rotor hub fairing system for a counter-rotating, coaxial rotor system.
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