Thrust reverser for a turbofan gas turbine engine
View Patent ↗The thrust reverser comprises sections, such as arms and skins, which may be connected along joints to provide a thrust reverser body. A plurality of fittings may be integrally formed on a surface of each arm.
1. A thrust reverser extending circumferentially around a longitudinal engine axis, the thrust reverser comprising two discrete opposite substantially rectangular-shaped arms having longitudinally-extending edges providing long sides of said rectangle shape, the arms connected together by two discrete opposite skins extending circumferentially between respective longitudinally-extending edges of the arms, each of the arms comprising a machined unitary solid body varying in thickness to have a plurality of fittings integrally machined in an exterior surface of each arm, the fittings configured to provide attachment points for at least an actuator of the thrust reverser.
2. The thrust reverser as defined in claim 1 , wherein at least some of the fittings include an attachment bore.
3. The thrust reverser as defined in claim 1 , wherein each arm includes at least one aperture for receiving a pivot mount for thrust reversing doors of the thrust reverser.
4. The thrust reverser as defined in claim 3 , wherein the pivot mount sections are adjacent to a rear end of the arms.
5. The thrust reverser as defined in claim 1 , further comprising longitudinally-extending joints extending between the arms and the skins.
6. The thrust reverser as defined in claim 5 , wherein the joints are selected from the group consisting of welded joints, brazed joints, riveted joints and bonded joints.
7. The thrust reverser as defined in claim 5 , further comprising a circumferential flange joined to a leading edge cooperatively provided by the arms and the skins.
8. The thrust reverser as defined in claim 1 , wherein at least one of the fittings on at least one of the arms projects from a section of the exterior side that is recessed with reference to a nominal exterior surface of the arm.
9. The thrust reverser as defined in claim 1 , wherein the arms are longitudinally longer than the skins.
10. A thrust reverser comprising:
an elongated generally cylindrical body extending around a longitudinal axis, the body having an interior jet pipe surface and an exterior surface, the body comprising at least four discrete longitudinally-extending sections, each of said sections fixedly joined to two adjacent sections along longitudinally-extending joints; and
at least one of said sections comprising a unitary machined solid arm varying in thickness to provide in the exterior surface a plurality of fittings integrally machined from said arm, said fittings projecting radially outwardly of the arm, at least some of the fittings having a central bore for connecting a thrust reverser component.
11. The thrust reverser as defined in claim 10 , wherein at least one of the fittings projects from a recessed portion of the exterior surface of the arm.
12. The thrust reverser as defined in claim 10 , wherein the body extends between a first end and a second end, the first end being at a leading edge of a jet pipe, the leading edge having a flange portion joined to the body.
13. The thrust reverser as defined in claim 10 , wherein a portion of the arm includes a region of reduced thickness.
14. A method of manufacturing a thrust reverser jet pipe, the method comprising:
machining at least one discrete, unitary, solid workpiece to vary thickness thereof and provide a support having integrated fittings on a side thereof;
forming at least one skin;
assembling the at least one support and the at least one skin to form a substantially cylindrical jet pipe duct of the thrust reverser;
joining the at least one support and skin to provide a rigid jet pipe body; and
connecting at least one piece of thrust reverser hardware to the integrated fittings, the hardware selected from the group consisting of actuators and latches.
15. The method as defined in claim 14 , wherein the step of machining includes machining all fittings in a same machine set-up.
16. The method as defined in claim 14 , further comprising the step of machining a reduced-thickness weight reduction region in a portion of the at least one support.
17. The method as defined in claim 14 , wherein two said supports and two said skins are provided, the step of assembling includes assembling a support between each skin and a skin between each support to thereby provide said duct, the supports and skins meeting along respective longitudinally-extending joints, and the step of joining comprises riveting along said longitudinally-extending joints.
18. The method as defined in claim 17 further comprising the step of joining a circumferential flange to an upstream lip of the jet pipe duct.
19. A thrust reverser comprising:
two discrete side arms disposed circumferentially oppositely apart and each including a machined unitary solid body varying in thickness due to machining thereof to have a plurality of integrally machined attachment fittings extending outwardly therefrom;
two discrete skins disposed circumferentially between said side arms and fixedly joined thereto to collectively form a duct; and
a discrete annular flange fixedly joined to said side arms and said skins to form a structural pipe assembly for precisely supporting thrust reverser doors and actuators therefor.
20. A thrust reverser according to claim 19 wherein said fittings comprise longitudinally spaced apart forward and aft fittings configured for supporting corresponding forward and aft ends of said actuators.
21. A thrust reverser according to claim 20 wherein said fittings comprise a flat pivot mount including a pair of holes for supporting corresponding pivots for said thrust reverser doors.
22. A thrust reverser according to claim 21 wherein said fittings are integrally machined in each of said side arms in common machining reference thereto for precise reference thereon.
23. A thrust reverser according to claim 21 wherein said skins comprise arcuate sheets circumferentially joining said side arms.
24. A thrust reverser according to claim 23 wherein said side arms and skins include corresponding rows of holes fixedly joined together by fasteners therein.
25. A method of making said thrust reverser according to claim 19 comprising:
separately machining said bodies to precisely form said fittings in said side arms;
separately forming said skins and flange; and
assembling and fastening together said side arms, skins, and flange to form said pipe assembly.