Landing gear for cargo aircraft

Patent metadata

Field	Value
Publication number	US-11279472-B2
Application number	US-201916405794-A
Country	US
Kind code	B2
Filing date	May 7, 2019
Priority date	May 7, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

Systems and methods for wide set retracting landing gear of a cargo aircraft. One embodiment is an aircraft that includes a fuselage including a nose, and a pair of main landing gears comprising a pair of main posts disposed across the fuselage, each main post having a main wheel and configured to pivot forward toward the nose to retract the main wheel. The aircraft also includes a pair of nose landing gears comprising a pair of nose posts disposed across the fuselage, each nose post having a nose wheel and configured to pivot inboard to retract the nose wheel.

First claim

What is claimed is:

1. A cargo aircraft comprising:
a fuselage that is cylindrical and includes a nose;
a cargo floor;
wings attached to an upper portion of the fuselage, resulting in a high-wing configuration for the cargo aircraft;
a pair of main landing gears comprising a pair of main posts disposed across the fuselage, each main post having a main wheel and configured to pivot forward toward the nose and outboard to retract the main wheel, wherein a retracted position of each main wheel is outside the fuselage and outside a structure of the wings, and in the retracted position at least a portion of each main wheel is higher than the cargo floor; and
a pair of nose landing gears comprising a pair of nose posts disposed across the fuselage, each nose post having a nose wheel and configured to pivot inboard to retract the nose wheel, wherein pivot points of the main landing gears are disposed inboard of pivot points of the nose landing gears.

2. The cargo aircraft of claim 1 wherein:
the cargo floor extends longitudinally along the fuselage,
wherein each main landing gear is configured to pivot the main post forward toward the nose to retract the main wheel to the retracted position where the main wheel is outboard from the cargo floor.

3. The cargo aircraft of claim 2 further comprising:
a pair of body fairings mounted to the fuselage,
wherein each main post includes at least two main wheels arranged in tandem longitudinally; and
wherein the at least two main wheels in the retracted position are disposed outside of the fuselage and inside one of the pair of body fairings.

4. The cargo aircraft of claim 1 wherein:
the nose posts of the nose landing gear are pivotally attached to the aircraft via the pivot points of the nose landing gears disposed outboard from the cargo floor; and
the main posts of the main landing gear are pivotally attached to the aircraft via the pivot points of the main landing gears disposed underneath the cargo floor directly under a load path of the aircraft.

5. The cargo aircraft of claim 1 wherein:
the main posts of the main landing gears are disposed inboard of wheels of the main landing gears while the main landing gears are retracted.

6. The cargo aircraft of claim 1 wherein:
the cargo floor extends longitudinally along the fuselage,
wherein each nose landing gear is configured to pivot the nose post to a retracted position to move the nose wheel toward a center of the fuselage underneath the cargo floor.

7. The cargo aircraft of claim 6 further comprising:
a pair of nose fairings mounted to the fuselage,
wherein each of the pivot points is disposed outside of the fuselage and inside one of the pair of nose fairings.

8. The cargo aircraft of claim 1 wherein:
each nose landing gear is configured to pivot the nose post inboard and forward toward the nose.

9. The cargo aircraft of claim 1 wherein:
each nose landing gear is configured to extend the nose post to an extended position via gravity and aerodynamic drag.

10. A cargo aircraft comprising:
a fuselage that is cylindrical and includes a nose;
a cargo floor extending longitudinally along the fuselage;
a pair of nose landing gears comprising a pair of nose posts disposed across the fuselage, each nose post having a nose wheel and configured to pivot inboard to retract the nose wheel toward a center line extending longitudinally along a belly of the fuselage, wherein retraction of the pair of nose landing gears is symmetric about the center line; and
main landing gears, wherein pivot points of the main landing gears are disposed inboard of pivot points of the nose landing gears, the pair of nose posts are pivotally attached to the aircraft via the pivot points of the nose landing gears, and the pivot points of the nose landing gears are disposed outboard from the cargo floor, wherein the main landing gears each include a main wheel, are configured to retract forward toward a nose of the aircraft and outboard, and in a retracted position at least a portion of each main wheel is higher than the cargo floor.

11. The cargo aircraft of claim 10 wherein:
each nose landing gear is configured to pivot the nose post to a retracted position to move the nose wheel toward the center line and underneath the cargo floor.

12. The cargo aircraft of claim 11 wherein:
the nose includes a hinge configured to pivot from a nose frame of the fuselage for loading cargo onto the cargo floor through the nose frame, and
the pair of nose posts are pivotally attached to the fuselage via the pivot points of the nose landing gears disposed aft of the nose frame.

13. The cargo aircraft of claim 12 further comprising:
a pair of nose fairings mounted to the fuselage,
wherein each of the pivot points of the nose landing gears is disposed outside of the fuselage and inside one of the pair of nose fairings.

14. The cargo aircraft of claim 10 wherein:
each nose landing gear is configured to pivot the nose post inboard and forward toward the nose.

15. A cargo aircraft comprising:
a fuselage that is cylindrical and includes a nose;
a cargo floor extending longitudinally along the fuselage;
wings attached to an upper portion of the fuselage, resulting in a high-wing configuration for the cargo aircraft;
a pair of main landing gears comprising a pair of main posts disposed across the fuselage, each main post having a main wheel and configured to pivot forward toward the nose and outboard to retract the main wheel to a retracted position where the main wheel is outboard from the cargo floor with at least a portion of the main wheel higher than the cargo floor, wherein the retracted position of each main wheel is outside the fuselage and outside a structure of the wings, and in the retracted position at least a portion of each main wheel is higher than the cargo floor; and
a pair of nose landing gears having nose posts, wherein pivot points of the main landing gears are disposed inboard of pivot points of the nose landing gears.

16. The cargo aircraft of claim 15 further comprising:
a pair of body fairings mounted to the fuselage,
wherein each main post includes at least two main wheels arranged in tandem longitudinally, and
wherein the at least two main wheels in the retracted position are disposed outside of the fuselage and inside one of the pair of body fairings.

17. The cargo aircraft of claim 15 wherein:
the pair of nose posts are pivotally attached to the aircraft via pivot points disposed outboard from the cargo floor.

18. The cargo aircraft of claim 15 wherein:
the pivot points of the main landing gears are disposed underneath the cargo floor.

19. The cargo aircraft of claim 15 wherein:
each main landing gear is configured to pivot the main post forward and outboard from the cargo floor.

20. The cargo aircraft of claim 15 wherein:
each main landing gear is configured to extend the main post to an extended position via gravity and aerodynamic drag.

Assignees

• Boeing Co

Inventors

• Schmidt Gregory M
• Cottet Justin Duane

Classifications

• B64C25/14

  fore-and-aft · CPC title

• B64C25/34

  wheeled type, e.g. multi-wheeled bogies · CPC title

• B64C25/18

  Operating mechanisms · CPC title

• B64C25/50

  Steerable undercarriages; Shimmy-damping · CPC title

• B64C25/20

  mechanical · CPC title