[특허]Nose landing gear arrangements and methods for making the same

Gulfstream Aerospace Corporation

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Nose landing gear arrangements and methods for making the same

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B64C-025/10 B64C-025/16 B64C-023/00 B64C-025/00 B64C-025/04 B64C-025/18
출원번호	US-0201345 (2014-03-07)
등록번호	US-9290263 (2016-03-22)
발명자 / 주소	Cook, Brian Louis, John Van de Ven, Thomas Vieito, Robert M. Khorrami, Mehdi R.
출원인 / 주소	Gulfstream Aerospace Corporation
대리인 / 주소	Ingrassia, Fisher & Lorenz PC
인용정보	피인용 횟수 : 3 인용 특허 : 7

초록
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Nose landing gear arrangements including a folding follow-up door for reducing airflow noise for aircrafts, aircrafts including such nose landing gear arrangements, and methods for making such nose landing gear arrangements are provided herein. 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 extend outside of the fuselage substantially along a generally vertical plane. A folding follow-up door is pivotally coupled to the main strut and extends to the fuselage. The folding follow-up door includes a first door section and a second door section that extend outwardly in directions away from each other to define an unfolded position. The folding follow-up door is foldable to move the first and second door sections towards each other about the generally vertical plane to define a folded position.

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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 extend outside of the fuselage substantially along a generally vertical plane to position the wheel assembly for takeoff and/or landing of the aircraft;a folding follow-up door pivotally coupled to the main strut and extending to the fuselage, wherein the folding follow-up door comprises a first door section and a second door section that extend outwardly in directions away from each other to define an unfolded position, and wherein the folding follow-up door is foldable to move the first and second door sections towards each other about the generally vertical plane to define a folded position; andan actuating arm pivotally coupled to the main strut and independently to the folding follow-up door and configured for moving the folding follow-up door between the unfolded and folded positions. 2. The nose landing gear arrangement of claim 1, wherein the first and second door sections are hingedly coupled together. 3. The nose landing gear arrangement of claim 1, wherein the first door section has a first inner edge portion and the second door section has a second inner edge portion that is adjacent to the first inner edge portion, and wherein the actuating arm has a distal end portion that pivotally couples to the first inner edge portion and independently to the second inner edge portion. 4. The nose landing gear arrangement of claim 1, wherein the first door section has a first outer edge portion and the second door section has a second outer edge portion, and wherein the folding follow-up door is configured to move the first and second outer edge portions towards each other and the generally vertical plane during folding. 5. The nose landing gear arrangement of claim 4, wherein the folding follow-up door is disposed aft of the main strut and is configured to move the first and second outer edge portions generally forward towards the main strut during folding. 6. The nose landing gear arrangement of claim 1, further comprising: a drag brace disposed between the main strut and the folding follow-up door, wherein the drag brace is pivotally coupled to the main strut and extends toward the fuselage; anda door brace pivotally coupled to the main strut between the drag brace and the actuating arm and having a first arm that is pivotally coupled to the first door section and a second arm that is pivotally coupled to the second door section, and wherein the door brace, the actuating arm, the drag brace, and the main strut are cooperatively configured to move the folding follow-up door between the unfolded and folded positions. 7. The nose landing gear arrangement of claim 6, wherein the first door section has a first outer edge portion and the second door section has a second outer edge portion, and wherein the first arm is pivotally coupled to the first door section proximate the first outer edge portion and the second arm is pivotally coupled to the second door section proximate the second outer edge portion. 8. The nose landing gear arrangement of claim 1, further comprising: a flexible sheet attached to the folding follow-up door, wherein the flexible sheet and the folding follow-up door are cooperatively configured to form a substantially airfoil shape surrounding the main strut when the folding follow-up door is in the folded position. 9. The nose landing gear arrangement of claim 8, wherein the flexible sheet comprises: a flexible skin; anda 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. 10. The nose landing gear arrangement of claim 8, wherein the first door section has a first outer edge and the second door section has a second outer edge, and wherein the flexible sheet is coupled to the first and second door sections proximate the first and second outer edges, respectively. 11. The nose landing gear arrangement of claim 10, wherein the first and second door sections each have an inner-forward surface that faces the main strut, and wherein the flexible sheet is disposed adjacent to and coupled to the inner-forward surfaces of the first and second door sections inboard of the first and second outer edges, respectively, at a distance of from about 10 to about 20 mm. 12. An aircraft comprising: a fuselage; anda 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 extend distally outside of the fuselage substantially along a generally vertical plane to position the wheel assembly in the extended position for takeoff and/or landing of the aircraft;a folding follow-up door pivotally coupled to the main strut and extending to the fuselage, wherein the folding follow-up door comprises a first door section and a second door section that extend outwardly in directions away from each other to define an unfolded position, and wherein the folding follow-up door is foldable to move the first and second door sections towards each other about the generally vertical plane to define a folded position; andan actuating arm pivotally coupled to the main strut defining an actuating arm-strut connection and independently to the folding follow-up door, wherein the actuating arm-strut connection is disposed along the main strut distal to the drag brace-strut connection, and wherein the actuating arm is configured to move the folding follow-up door between the unfolded and folded positions during movement of the nose landing gear arrangement between the retracted and extended positions. 13. The aircraft of claim 12, wherein the nose landing gear arrangement further comprises: a drag brace disposed between the main strut and the folding follow-up door, wherein the drag brace is pivotally coupled to an intermediate portion of the main strut defining a drag brace-strut connection and extends toward the fuselage, and wherein the nose landing gear arrangement is configured to rotate the main strut about a center of rotation proximate the drag brace-strut connection during movement of the nose landing gear arrangement between the retracted and extended positions. 14. The aircraft of claim 12, wherein the nose landing gear arrangement further comprises: a door brace pivotally coupled to the main strut defining a door brace-strut connection that is disposed along the main strut between the drag brace-strut connection and the actuating arm-strut connection, wherein the actuating arm has a first arm that is pivotally coupled to the first door section and a second arm that is pivotally coupled to the second door section, and wherein the door brace, the actuating arm, the drag brace, and the main strut are cooperatively configured to move the folding follow-up door between the unfolded and folded positions during movement of the nose landing gear arrangement between the retracted and extended positions. 15. The aircraft of claim 12, wherein the first and second door sections are pivotally coupled to the fuselage so as to allow the folding follow-up door to move between the retracted and extended positions and between the unfolded and folded positions. 16. The aircraft of claim 12, wherein the nose landing gear arrangement further comprises: a flexible sheet attached to the folding follow-up door, wherein the flexible sheet and the folding follow-up door are cooperatively configured to form a substantially airfoil shape about the main strut when the folding follow-up door is in the folded position. 17. The aircraft of claim 16, wherein the first door section has a first outer edge and the second door section has a second outer edge, and wherein the flexible sheet is coupled to the first and second door sections inboard of the first and second outer edges, respectively. 18. 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;pivotally coupling a folding follow-up door to the main strut and extending the folding follow-up door to the fuselage, wherein the folding follow-up door is foldable to move first and second door portions of the folding follow-up door towards each other about a generally vertical plane that is substantially aligned with the main strut to define a folded position; andpivotally coupling an actuating arm to the main strut and independently to the folding follow-up door for moving the folding follow-up door between an unfolded position and the folded position.

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이 특허를 인용한 특허 피인용횟수: 3

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Nose landing gear arrangements and methods for making the same

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