[특허]Hydraulic strut assembly for semi-levered landing gear

THE BOEING COMPANY

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Hydraulic strut assembly for semi-levered landing gear

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B64C-025/60 B64C-025/22 B64C-025/34 F15B-015/16 B64C-025/36
출원번호	US-0697621 (2015-04-28)
등록번호	US-9764827 (2017-09-19)
발명자 / 주소	Lindahl, Gary M. Nelson, Eric Howard Mellor, Mitchell Loren Ray
출원인 / 주소	THE BOEING COMPANY
대리인 / 주소	Yee & Associates, P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 40

초록
▼

A hydraulic strut assembly, for use in a semi-levered landing gear in an aircraft, comprising an actuator and a manifold associated with the actuator. The actuator comprises a housing, a first piston, a second piston, and a third piston. The first piston is positioned between outer and inner cylindrical structures of the housing. The outer and inner cylindrical structures and first piston form an outer chamber that receives a first fluid. The inner cylindrical structure, the first piston, and the second piston, which is nested within the first piston, form an inner chamber, which holds a second fluid comprising a gas. A volume of the inner chamber changes when at least one of the first and second pistons moves. The third piston is positioned between the outer cylindrical structure and the first piston. The first, second, and third pistons move in a direction parallel to an axis through the housing.

대표
청구항
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1. A telescopic actuator assembly comprising: a housing comprising an outer cylindrical structure and a plurality of channels configured to allow a liquid to flow through the structure;three concentric pistons comprising a first piston, a second piston, and a third piston, wherein the first piston is disposed to slide in and out of the outer cylindrical structure, the second piston is disposed to slide in and out of the first piston, and the third piston is disposed to slide only within the outer cylindrical structure, the third piston being radially outside the first piston;an inner cylindrical structure linked to the housing, wherein the first piston is disposed to slide against an outer periphery of the inner cylindrical structure, and wherein the second piston engages and slides in and out of the inner cylindrical structure. 2. The telescopic actuator of claim 1, further comprising a first sub-chamber within the housing and a second sub-chamber within the housing, wherein the first piston and the third piston separate the first sub-chamber and the second sub-chamber, and wherein a liquid is disposed inside both the first sub-chamber and the second sub-chamber; a third sub-chamber disposed within the first piston and the second piston and the inner cylindrical structure, wherein the third sub-chamber contains both a gas and a liquid, and wherein the third sub-chamber is separated from the first sub-chamber by the inner cylindrical structure and the second sub-chamber by the first piston. 3. The telescopic actuator of claim 2, wherein the second piston engages with the inner cylindrical structure to divide the third sub-chamber and create a fourth sub-chamber and a fifth sub-chamber, the fourth sub-chamber and the fifth sub-chamber smaller than the third sub-chamber. 4. The telescopic actuator assembly of claim 2, wherein the second piston contains a cavity and wherein the telescopic actuator assembly further comprises: a tube, open at both ends, connecting the cavity in the second piston with the third sub-chamber, wherein the tube extends from one side of the cavity and into the third sub-chamber, thereby connecting the two chambers and allowing gas in the third sub-chamber to expand into the cavity, and allowing liquid to remain in the third sub-chamber, and not the cavity in the second piston, and wherein an extending action of the first piston or the second piston will create decreasing pressure in third sub-chamber and draw liquid from the cavity within the second piston and return the liquid to the third sub-chamber. 5. The telescopic actuator assembly of claim 4, wherein the tube enables an amount of liquid in the third sub-chamber to be minimized and wherein the tube is positioned to lubricate a seal in the third sub-chamber, the seal located between the first piston and the inner cylindrical structure relative to the first piston and the second piston. 6. The telescopic actuator assembly of claim 1, wherein a valve manifold is connected to the housing, and wherein the manifold comprises a plurality of channels and valves configured to control flow of the liquid to or from the first sub-chamber and the second sub-chamber in order to control positions of the first piston and the third piston and to control pressure in the second sub-chamber. 7. The telescopic actuator assembly of claim 1, wherein an amount of gas in the third sub-chamber is kept constant and an amount of liquid in the third sub-chamber is kept constant. 8. The telescopic actuator assembly of claim 1, wherein the first piston, the second piston, and the third piston move together to a first position when the actuator assembly is subject to external tension loads applied between the housing and the second piston, and wherein the first piston and the second piston move together to a second position when subject to external compression loads. 9. The telescopic actuator assembly of claim 1, wherein an amount of gas within the third sub-chamber is selected to provide a first pressure that is greater than a second pressure external to the housing, and wherein the first pressure causes the first piston, the second piston, and the third piston to extend together to a first position when an externally applied compression load is below a first compression load. 10. The telescopic actuator assembly of claim 9, wherein the first piston, the second piston, and the third piston move together within the housing to a third position when an external hydraulic pressure is supplied to a valve manifold connected to the housing, wherein the valve manifold has a first configuration that reduces hydraulic pressure applied to the second chamber when an externally applied tension load at the second piston is below a first tension load. 11. The telescopic actuator assembly of claim 9, wherein the first piston, the second piston, and the third piston move together within the housing to a third position when an external hydraulic pressure is supplied to a valve manifold connected to the housing, wherein the valve manifold has a second configuration that applies full hydraulic pressure to the second chamber when an externally applied tension load at second piston is below a second tension load. 12. The telescopic actuator assembly of claim 5, wherein a gas in the third sub-chamber allows for rapid compression of the second piston under an externally applied second compression load greater than a first compression load. 13. The telescopic actuator assembly of claim 3, wherein the fourth sub-chamber contains a relief valve to allow liquid to flow from the fourth sub-chamber into the fifth sub-chamber and the second piston to extend when the first piston and the second piston are separated and an external tension load applied to second piston is greater than a third tension load. 14. The telescopic actuator assembly of claim 13 further comprising a valve manifold, wherein the actuator, the valve manifold, the gas, the liquid, form a lockable hydraulic strut and are part of a semi-levered landing gear assembly in an aircraft.

이 특허에 인용된 특허 (40)

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특허 상세정보

Hydraulic strut assembly for semi-levered landing gear

초록
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이 특허에 인용된 특허 (40)

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Hydraulic strut assembly for semi-levered landing gear

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이 특허에 인용된 특허 (40)

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상세정보조회

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IPC 상세정보(version : 201201)

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