Nose landing gear arrangements including a flexible sheet and methods for making the same

Patent metadata

Field	Value
Publication number	US-2016200423-A1
Application number	US-201514623972-A
Country	US
Kind code	A1
Filing date	Feb 17, 2015
Priority date	Mar 7, 2014
Publication date	Jul 14, 2016
Grant date	—

Abstract

Nose landing gear arrangements for aircrafts, aircrafts including such nose landing gear arrangements, and methods for making such nose landing gear arrangements are provided. In one example, a nose landing gear arrangement includes a wheel assembly and a main strut. The main strut is operatively coupled to the wheel assembly and is configured to move between an extended position and a retracted position. The main strut in the extended position extends outside of the fuselage substantially along a generally vertical plane to position the wheel assembly for takeoff and/or landing of the aircraft. The main strut in the retracted position is disposed inside the fuselage. A flexible sheet is disposed adjacent to the main strut and is configured such that when the main strut is in the extended position the flexible sheet is positioned substantially around the main strut.

First claim

What is claimed is:

1 . A nose landing gear arrangement for an aircraft that includes a fuselage, the nose landing gear arrangement comprising:
a wheel assembly; a main strut operatively coupled to the wheel assembly and configured to move between an extended position and a retracted position, wherein the main strut in the extended position extends outside of the fuselage substantially along a generally vertical plane to position the wheel assembly for takeoff and/or landing of the aircraft, and wherein the main strut in the retracted position is disposed inside the fuselage; and a flexible sheet disposed adjacent to the main strut and configured such that when the main strut is in the extended position the flexible sheet is positioned substantially around the main strut.

2 . The nose landing gear arrangement of claim 1 , wherein at least a portion of the flexible sheet is disposed forward of the main strut when the main strut is in the extended position.

3 . The nose landing gear arrangement of claim 2 , wherein the flexible sheet is configured to form at least in part a substantially airfoil shape that substantially surrounds the main strut when the main strut is in the extended position.

4 . The nose landing gear arrangement of claim 3 , wherein the portion of the flexible sheet that is disposed forward of the main strut flexible sheet has a leading edge airfoil profile as part of the substantially airfoil shape when the main strut is in the extended position.

5 . The nose landing gear arrangement of claim 1 , wherein the flexible sheet comprises:
a flexible skin; and a plurality of juxtaposed reinforcing rods that are spaced apart and coupled to the flexible skin to provide a semi-flexible reinforcing frame for the flexible skin.

6 . The nose landing gear arrangement of claim 5 , wherein the flexible skin comprises a polymeric material selected from the group consisting of polyurethane, polyester, polyamide, vinyl, polyolefin, and combinations thereof.

7 . The nose landing gear arrangement of claim 5 , wherein the juxtaposed reinforcing rods comprises a reinforcing material selected from the group consisting of metal, polymeric material, fiber reinforced polymeric composite, and combinations thereof.

8 . The nose landing gear arrangement of claim 5 , wherein each of the juxtaposed reinforcing rods is disposed along a generally horizontal plane when the main strut is in the extended position.

9 . The nose landing gear arrangement of claim 1 , wherein the flexible sheet is operatively coupled to the main strut so as to move with the main strut between the extended and retracted positions.

10 . An aircraft comprising:
a fuselage; and a nose landing gear arrangement moveable between a retracted position in which the nose landing gear arrangement is disposed in the fuselage and an extended position in which the nose landing gear arrangement extends outside of the fuselage, wherein the nose landing gear arrangement comprises:
a wheel assembly;
a main strut operatively coupled to the wheel assembly and configured to move between the extended position and the retracted position, wherein the main strut in the extended position extends outside of the fuselage substantially along a generally vertical plane to position the wheel assembly for takeoff and/or landing of the aircraft; and
a flexible sheet disposed adjacent to the main strut and configured such that when the main strut is in the extended position the flexible sheet is positioned substantially around the main strut.

11 . The aircraft of claim 10 , wherein at least a portion of the flexible sheet is disposed forward of the main strut when the main strut is in the extended position.

12 . The aircraft of claim 11 , wherein the flexible sheet is configured to form at least in part a substantially airfoil shape that substantially surrounds the main strut when the main strut is in the extended position.

13 . The aircraft of claim 12 , wherein the portion of the flexible sheet that is disposed forward of the main strut flexible sheet has a leading edge airfoil profile as part of the substantially airfoil shape when the main strut is in the extended position.

14 . The aircraft of claim 10 , wherein the flexible sheet comprises:
a flexible skin; and a plurality of juxtaposed reinforcing rods that are spaced apart and coupled to the flexible skin to provide a semi-flexible reinforcing frame for the flexible skin.

15 . The aircraft of claim 14 , wherein the flexible skin comprises a polymeric material selected from the group consisting of polyurethane, polyester, polyamide, vinyl, polyolefin, and combinations thereof.

16 . The aircraft of claim 14 , wherein the juxtaposed reinforcing rods comprises a reinforcing material selected from the group consisting of metal, polymeric material, fiber reinforced polymeric composite, and combinations thereof.

17 . The aircraft of claim 14 , wherein each of the juxtaposed reinforcing rods is disposed along a generally horizontal plane when the main strut is in the extended position.

18 . The aircraft of claim 10 , wherein the flexible sheet is operatively coupled to the main strut so as to move with the main strut between the extended and retracted positions.

19 . A method for making a nose landing gear arrangement for an aircraft that includes a fuselage, the method comprising the steps of:
operatively coupling a main strut to a wheel assembly; and positioning a flexible sheet adjacent to the main strut, wherein the flexible sheet is configured to extend substantially around the main strut when the main strut is in an extended position in which the main strut extends outside of the fuselage.

20 . The method of claim 19 , wherein the step of positioning comprises operatively coupling the flexible sheet to the main strut such that the flexible sheet moves with the main strut between the extended position and a retracted position in which the main strut is disposed inside of the fuselage.

Assignees

• Gulfstream Aerospace Corp

Inventors

• Cook Brian
• Louis John
• Van De Ven Thomas
• Vieito Robert M

Classifications

• B64C25/34

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

• B64C25/14 Primary

  fore-and-aft · CPC title

• B64C25/001 Primary

  Devices not provided for in the groups B64C25/02 - B64C25/68 · CPC title

• B64C2025/003

  Means for reducing landing gear noise, or turbulent flow around it, e.g. landing gear doors used as deflectors · CPC title