Granted Patent B2

US 12,246,825 · App. 18/380,235 · Granted Mar 11, 2025

Inventors: Adil Azzat (Aulnay-sous-Bois, FR); Julien Thivend (Bagneux, FR); Sixtine Coston (Bagneux, FR)

Assignee: AIRBUS HELICOPTERS

B64C27/48F01D5/30F01D25/06B64C27/32B64C27/51F05D2220/90F05D2240/30F05D2260/96

Abstract

Claims (43)

1. A blade comprising a blade root extended by an aerodynamic intermediate part that extends up to a free end,

wherein the blade root comprises a one-piece attachment body made from composite materials, the attachment body being hollow and having a casing that defines an empty internal space, the attachment body incorporating a pitch attachment configured to be traversed by a pitch link rod connected to a pitch lever, the attachment body incorporating a leading edge attachment configured to be traversed by a leading edge link rod connected to a first drag damper, the attachment body incorporating a trailing edge attachment configured to be traversed by a trailing edge link rod configured to be connected to a second drag damper, the attachment body incorporating a connection attachment configured to be traversed by at least two connecting rods connected to a first reinforcement of a stratified spherical stop; and

wherein the leading edge attachment comprises two leading edge holes provided in the casing to either side of the internal space according to a leading edge axis, the two leading edge holes being configured to be traversed by the leading edge link rod along the leading edge axis.

2. The blade according to claim 1 ,

wherein the pitch attachment is closer to the leading edge attachment than to the trailing edge attachment.

3. The blade according to claim 1 ,

wherein the pitch attachment comprises a pitch clevis provided with two parallel pitch wings that are inseparable from the casing, the two pitch wings respectively comprising two pitch holes aligned along a pitch connection axis and configured to be traversed by the pitch link rod along the pitch connection axis, the pitch clevis protruding from the casing into an area outside the blade.

4. The blade according to claim 1 ,

wherein the leading edge attachment comprises a leading edge clevis provided with two parallel leading edge wings that are inseparable from the casing, the two leading edge wings respectively comprising two leading edge holes that are aligned along a leading edge axis and configured to be traversed by the leading edge link rod along the leading edge axis, the leading edge clevis protruding from the casing into an area outside the blade.

5. The blade according to claim 3 ,

wherein the leading edge attachment comprises a leading edge clevis provided with two parallel leading edge wings that are inseparable from the casing, the two leading edge wings respectively comprising two leading edge holes that are aligned along a leading edge axis and configured to be traversed by the leading edge link rod along the leading edge axis, the leading edge clevis protruding from the casing into an area outside the blade, and wherein each pitch wing is connected to the two leading edge wings.

6. The blade according to claim 1 ,

wherein the trailing edge attachment comprises a trailing edge clevis provided with two parallel trailing edge wings that are inseparable from the casing, the two trailing edge wings respectively comprising two trailing edge holes that are aligned along a trailing edge axis and configured to be traversed by the trailing edge link rod along the trailing edge axis, the trailing edge clevis protruding from the casing into an area outside the blade.

7. The blade according to claim 1 ,

wherein the trailing edge attachment comprises two trailing edge holes provided in the casing to either side of the internal space according to a trailing edge axis, the two trailing edge holes being configured to be traversed by the trailing edge link rod along the trailing edge axis.

8. The blade according to claim 3 ,

wherein the leading edge attachment comprises a leading edge clevis provided with two parallel leading edge wings that are inseparable from the casing, the two leading edge wings respectively comprising two leading edge holes that are aligned along a leading edge axis and configured to be traversed by the leading edge link rod along the leading edge axis, the leading edge clevis protruding from the casing into an area outside the blade, and wherein the trailing edge attachment comprises a trailing edge provided with two parallel trailing edge wings that are inseparable from the casing, the two trailing edge wings respectively comprising two trailing edge holes that are aligned along a trailing edge axis and configured to be traversed by the trailing edge link rod along the trailing edge axis, the trailing edge clevis protruding from the casing into an area outside the blade.

9. The blade according to claim 3 ,

wherein the trailing edge attachment comprises two trailing edge holes provided in the casing to either side of the internal space according to a trailing edge axis, the two trailing edge holes being configured to be traversed by the trailing edge link rod along the trailing edge axis.

10. The blade according to claim 1 ,

wherein the connection attachment comprises, for each connecting rod, a set of two connection holes provided in the casing along a connection axis configured to coincide with the connecting rods.

11. The blade according to claim 1 ,

wherein the casing comprises a layer made from composite materials surrounding the internal space and extending the intermediate part, the casing comprising a laminate reinforcement at least at the trailing edge attachment and the leading edge attachment.

12. A rotor provided with a rotor head, the rotor comprising at least one stratified spherical stop, the stratified spherical stop comprising a stratified central part inserted between a first reinforcement and a second reinforcement, the second reinforcement being fastened to the rotor head,

wherein the rotor comprises at least one blade according to claim 1 , the rotor comprising the at least two connecting rods passing through the connection attachment and the second reinforcement, the rotor comprising a pitch link rod passing through the pitch attachment and a pitch hinge of a pitch rod, the rotor comprising a leading edge link rod passing through the leading edge attachment and a leading edge hinge of a first drag damper, the rotor comprising a trailing edge link rod passing through the trailing edge attachment and a trailing edge hinge of a second drag damper.

13. The rotor according to claim 12 ,

wherein, the rotor comprises at least three blades, the trailing edge attachment of a particular blade is connected by a drag damper to the leading edge attachment of the following blade in a direction of rotation of the rotor and the leading edge attachment of the particular blade is connected by another drag damper to the trailing edge attachment of the preceding blade in the direction of rotation.

14. An aircraft,

wherein the aircraft comprises the rotor according to claim 12 .

15. A blade comprising a blade root extended by an aerodynamic intermediate part that extends up to a free end,

wherein the blade root comprises a one-piece attachment body made from composite materials, the attachment body being hollow and having a casing that defines an empty internal space, the attachment body incorporating a pitch attachment configured to be traversed by a pitch link rod connected to a pitch lever, the attachment body incorporating a leading edge attachment configured to be traversed by a leading edge link rod connected to a first drag damper, the attachment body incorporating a trailing edge attachment configured to be traversed by a trailing edge link rod configured to be connected to a second drag damper, the attachment body incorporating a connection attachment configured to be traversed by at least two connecting rods connected to a first reinforcement of a stratified spherical stop; and

wherein the trailing edge attachment comprises two trailing edge holes provided in the casing to either side of the internal space according to a trailing edge axis, the two trailing edge holes being configured to be traversed by the trailing edge link rod along the trailing edge axis.

16. The blade according to claim 15 ,

wherein the pitch attachment is closer to the leading edge attachment than to the trailing edge attachment.

17. The blade according to claim 15 ,

wherein the pitch attachment comprises a pitch clevis provided with two parallel pitch wings that are inseparable from the casing, the two pitch wings respectively comprising two pitch holes aligned along a pitch connection axis and configured to be traversed by the pitch link rod along the pitch connection axis, the pitch clevis protruding from the casing into an area outside the blade.

18. A blade comprising a blade root extended by an aerodynamic intermediate part that extends up to a free end,

wherein the blade root comprises a one-piece attachment body made from composite materials, the attachment body being hollow and having a casing that defines an empty internal space, the attachment body incorporating a pitch attachment configured to be traversed by a pitch link rod connected to a pitch lever, the attachment body incorporating a leading edge attachment configured to be traversed by a leading edge link rod connected to a first drag damper, the attachment body incorporating a trailing edge attachment configured to be traversed by a trailing edge link rod configured to be connected to a second drag damper, the attachment body incorporating a connection attachment configured to be traversed by at least two connecting rods connected to a first reinforcement of a stratified spherical stop; and

wherein the casing comprises a layer made from composite materials surrounding the internal space and extending the intermediate part, the casing comprising a laminate reinforcement at least at the trailing edge attachment and the leading edge attachment.

19. The blade according to claim 18 ,

wherein the leading edge attachment comprises two leading edge holes provided in the casing to either side of the internal space according to a leading edge axis, the two leading edge holes being configured to be traversed by the leading edge link rod along the leading edge axis, and wherein the trailing edge attachment comprises two trailing edge holes provided in the casing to either side of the internal space according to a trailing edge axis, the two trailing edge holes being configured to be traversed by the trailing edge link rod along the trailing edge axis.

20. The blade according to claim 18 ,

wherein the pitch attachment is closer to the leading edge attachment than to the trailing edge attachment.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (31)