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1. WO2007106064 - Étrier de rotor d'hélicoptère et son procédé de fabrication

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS
What Is Claimed Is:
1. A rotor yoke for a helicopter, comprising:
a blade attachment portion;
a mast attachment portion;
an intermediate portion extending between the blade attachment portion and the mast attachment portion, wherein the intermediate portion, the blade attachment portion, and the mast attachment portion define an optional inner edge, such that the inner edge, if present, defines an opening; and
a peripheral, outer edge extending about the blade attachment portion, the intermediate portion, and the mast attachment portion;
wherein at least one of the outer edge and the inner edge, if present, includes a reduced thickness portion exhibiting a thickness that is less than a thickness of an adjacent portion of the rotor yoke.

2. The rotor yoke, according to claim 1 , wherein the reduced thickness portion exhibits a thickness that is less than a thickness of an immediately adjacent portion of the rotor yoke.

3. The rotor yoke, according to claim 1 , wherein the reduced thickness portion is frustotriangular in cross-section.

4. The rotor yoke, according to claim 1 , wherein the reduced thickness portion comprises:
a first tapered surface;
a second tapered surface; and
an edge flat extending between the first tapered surface and the second tapered surface.

5. The rotor yoke, according to claim 4, wherein at least one of the first tapered surface and the second tapered surface exhibits a taper of about 30 degrees.

6. The rotor yoke, according to claim 1 , wherein the reduced thickness portion comprises:
a first tapered surface; and
a second tapered surface extending to the first tapered surface.

7. The rotor yoke, according to claim 6, wherein at least one of the first tapered surface and the second tapered surface exhibits a taper of about 30 degrees.

8. The rotor yoke, according to claim 1 , wherein the reduced thickness portion exhibits a radius.

9. The rotor yoke, according to claim 8, wherein the radius corresponds to the thickness of the rotor yoke adjacent to the reduced thickness portion.

10. The rotor yoke, according to claim 1 , wherein the reduced thickness portion comprises:
a first radiused surface;
a second radiused surface; and
an edge flat extending between the first radiused surface and the second radiused surface.

11. The rotor yoke, according to claim 1 , wherein both the outer edge and the inner edge include reduced thickness portions exhibiting thicknesses that are less than thicknesses of portions of the rotor yoke adjacent the reduced thickness portions.

12. The rotor yoke, according to claim 1 , wherein the reduced thickness portion extends substantially along an entirety of the outer edge.

13. The rotor yoke, according to claim 1 , wherein the reduced thickness portion extends substantially along an entirety of the inner edge.

14. The rotor yoke, according to claim 1 , wherein the reduced thickness portion is located in an area of high interlaminar shear strain when the rotor yoke is in service.

5 15. The rotor yoke, according to claim 1 , further comprising:
a second blade attachment portion;
wherein the intermediate portion extends between the mast attachment portion and the blade attachment portions; and
wherein the outer edge extends about the blade attachment portions, the 0 intermediate portion, and the mast attachment portion.

16. A rotor yoke for a helicopter, comprising:
a pair of spaced apart longitudinal, side portions having ends;
a transverse, central portion interconnecting the side portions; and
5 a pair of outboard portions interconnecting the ends of the side portions;
wherein the side portions, central portion, and end portions define an outer edge and an inner edge, such that the inner edge defines an opening; and
wherein one of the outer edge and the inner edge includes a reduced thickness portion exhibiting a thickness that is less than a thickness of an adjacent 0 portion of the rotor yoke.

17. A rotor yoke assembly, comprising:
a plurality of rotor yokes, fixedly clocked with respect to one another;
wherein at least one of the plurality of rotor yokes comprises:
!5 a blade attachment portion;
a mast attachment portion;
an intermediate portion extending between the blade attachment
portion and the mast attachment portion, wherein the intermediate portion, the blade attachment portion, and the mast attachment portion define an optional 0 inner edge, such that the inner edge, if present, defines an opening; and
a peripheral, outer edge extending about the blade attachment portion, the intermediate portion, and the mast attachment portion;

wherein at least one of the outer edge and the inner edge, if present, includes a reduced thickness portion exhibiting a thickness that is less than a thickness of an adjacent portion of the rotor yoke.

5 18. A method for making a rotor yoke, comprising the steps of:
providing a rotor yoke having an edge exhibiting substantially the same thickness as an adjacent portion of the rotor yoke; and
reducing a thickness of at least a portion of the edge of the rotor yoke.

0 19. The method, according to claim 18, wherein the step of reducing the thickness is accomplished by a machining process.

20. A method for making a rotor yoke, comprising the steps of:
determining an area of the rotor yoke that will experience high interlaminar 5 shear strain when in use; and
reducing a thickness of an edge of the rotor yoke proximate the area of the rotor yoke that will experience high interlaminar shear strain when in use.

21. The method, according to claim 20, wherein the step of determining '.0 the area is accomplished by computer simulation.

22. The method, according to claim 20, wherein the step of determining the area is accomplished by analysis of the rotor yoke after flight.

!5 23. The method, according to claim 20, wherein the step of determining the area is accomplished by off-vehicle testing.

24. The method, according to claim 20, wherein the step of reducing the thickness is accomplished by molding.
0
25. The method, according to claim 20, wherein the step of reducing the thickness is accomplished by machining.