CN112173083B - Tail undercarriage attach fitting - Google Patents
Tail undercarriage attach fitting Download PDFInfo
- Publication number
- CN112173083B CN112173083B CN202011028749.9A CN202011028749A CN112173083B CN 112173083 B CN112173083 B CN 112173083B CN 202011028749 A CN202011028749 A CN 202011028749A CN 112173083 B CN112173083 B CN 112173083B
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- connecting plates
- landing gear
- tail
- tail landing
- vertical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/02—Undercarriages
- B64C25/04—Arrangement or disposition on aircraft
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Tires In General (AREA)
- Gears, Cams (AREA)
Abstract
The invention belongs to the technical field of undercarriage design, and discloses a tail undercarriage connecting joint, which comprises: the device comprises two transverse connecting plates, two longitudinal connecting plates, four vertical connecting plates and a tail landing gear connecting piece; the two transverse connecting plates and the two longitudinal connecting plates form a quadrilateral structure, and the four vertical connecting plates are correspondingly connected to the two transverse connecting plates and the two longitudinal connecting plates respectively; the tail landing gear connecting piece is positioned in the center of the four vertical connecting plates, is a hollow bowl-shaped annular piece, and is connected with the four vertical connecting plates through reinforcing ribs at one circle; the two transverse connecting plates and the two vertical connecting plates are fixedly connected with the machine body frame, and the two longitudinal connecting plates and the two vertical connecting plates are fixedly connected with the machine body beam.
Description
Technical Field
The invention belongs to the technical field of undercarriage design, and particularly relates to a tail undercarriage connecting joint.
Background
The tail landing gear on-board connection joint is the most critical part of the whole helicopter structure and is used for diffusing landing, carrier landing and ground load to the fuselage structure. The design of the joint directly influences the key index requirements such as load transmission efficiency and weight efficiency, so the design of the joint is always emphasized. In the design of the prior connecting joint, firstly, the load bearing characteristic of the joint is started, particularly, the load transmission path arrangement of the joint and the peripheral connecting structure is carried out on the joint bearing the main concentrated load according to the load bearing characteristic of the joint, and the joint is relatively large in load bearing and relatively high in requirements on the strength and the rigidity of the peripheral connecting structure, so that the joint is generally positioned in a closed space formed by the peripheral connecting structure, the assembly simplicity, the maintainability and the joint interchangeability are not favorably influenced, and the later service life of a helicopter is influenced.
Disclosure of Invention
The invention aims to provide a tail landing gear connecting joint, which is arranged from the bottom of a machine body and is convenient for maintenance and exchange of the connecting joint on the whole tail landing gear machine.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a tail landing gear adapter, comprising: two transverse connecting plates (1), two longitudinal connecting plates (2), four vertical connecting plates (3) and a tail landing gear connecting piece (4);
the two transverse connecting plates (1) and the two longitudinal connecting plates (2) form a quadrilateral structure, and the four vertical connecting plates (3) are correspondingly connected to the two transverse connecting plates (1) and the two longitudinal connecting plates (2) respectively;
the tail landing gear connecting piece (4) is positioned in the center of the four vertical connecting plates (3), the tail landing gear connecting piece (4) is a hollow bowl-shaped annular piece, and the circumference of the hollow bowl-shaped annular piece is connected with the four vertical connecting plates (3) through reinforcing ribs;
the two transverse connecting plates (1) and the two vertical connecting plates (3) are fixedly connected with the machine body frame, and the two longitudinal connecting plates (2) and the two vertical connecting plates (3) are fixedly connected with the machine body beam.
The technical scheme of the invention has the characteristics and further improvements that:
(1) The tail landing gear connecting plate is generally circular, reinforcing ribs are uniformly distributed along the circumferential periphery, and mounting points of the tail landing gear are uniformly distributed along the circumferential direction.
(2) The reinforcing ribs are uniformly distributed along the circumferential periphery, and each reinforcing rib is approximately fan-shaped.
(3) The distance between the mounting points of the adjacent tail landing gears is 100mm-120mm.
(4) The sizes of two transverse connecting plates (1), two longitudinal connecting plates (2) and four vertical connecting plates (3) are correspondingly determined according to the positions of the machine body frame and the machine body beam.
(5) And the tail landing gear mounting point of the tail landing gear connecting piece (4) is connected with the tail landing gear through a fastener.
(6) Reinforcing ribs for transferring the load of the landing gear are arranged between the tail landing gear connecting piece (4) and the four vertical connecting plates (3).
(7) The reinforcing ribs for transferring the load of the landing gear are symmetrical along the helicopter heading.
According to the tail landing gear connecting joint, the L-shaped connecting surfaces are arranged on the periphery of the joint, so that the interchangeability and the maintainability of the joint can be realized. The joint structure is integrally formed by machining a plate, the structural form fully utilizes a topology optimization technology, and the load transmission efficiency is high; after the first-stage target is realized, the optimal distribution form of the main bearing ribs is searched by fully utilizing the topology optimization technology; a dimension optimization technology is adopted, and the specific thickness value of each block is determined; the stress control technology is adopted, and the requirements of static strength and fatigue strength are met.
Drawings
FIG. 1 is a schematic view of a tail landing gear attachment joint configuration;
wherein, 1-transverse connecting plate, 2-longitudinal connecting plate, 3-vertical connecting plate, 4-tail landing gear connecting piece, 5-connecting rib.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When the joint and the connecting structure are designed, two-stage design is carried out, namely: the method comprises the steps of assembly simplicity, process implementability, maintainability, load transmission path arrangement and structure optimization design.
Firstly, in the first design stage, the past design thought is abandoned, and the assembly stage which can only be accepted passively is put into the first stage for priority. In the stage, the target point is considered by taking the assembly simplicity and the maintenance and overhaul convenience as the core, in order to realize the target, a craft worker intervenes in advance, iterative optimization is carried out on the structure configuration and the arrangement scheme on the premise that the overall positions of the joint and the peripheral supporting structure are basically determined, the constraint suggestions of all parties are fully considered, the lower edge of the peripheral main supporting beam is cut off in an innovative manner, and a scheme for carrying out structural compensation on the main supporting beam by designing a corresponding edge strip through the tail start joint, so that the stage design target of the assembly simplicity and the maintainability is realized.
In the second stage, the force transmission path arrangement and the structure optimization of the joint body and the peripheral supporting structure are carried out, a new design space is constructed on the basis of the basic size of the joint body in the stage, and the optimal material distribution form including the symmetry constraint of the structure and the constraint of the pattern drawing direction is found through topological optimization; and then, an optimal thickness value is searched through size optimization, a deformation control technology and a stress control technology are adopted, and finally, an optimized result is checked. Through the work, the optimal bearing path and the thickness dimension of the joint are obtained.
The tail landing gear connecting joint is a box-shaped part which is formed by a transverse connecting plate 1, a longitudinal connecting plate 2, a vertical connecting plate 3 and a tail landing gear connecting plate 4 in a surrounding mode. The tail landing gear connecting plate 4 is a ring-shaped piece and is used for installing the tail landing gear, landing ship landing load of the tail landing gear is transmitted to the whole joint, the tail landing gear is connected to the tail landing gear connecting plate 4 through detachable connecting pieces (such as bolts) and quick exchange and maintenance of the tail landing gear can be achieved. Transverse connection board 1, longitudinal tie plate 2, vertical connecting plate 3 suit with the frame roof beam of organism structure respectively, can play the effect of organism frame roof beam, and inside according to concrete atress condition, the adoption topology optimization result arranges the strengthening rib for the load diffusion that comes with the transmission of tail undercarriage to the fuselage.
(1) The connecting plate of the tail landing gear is generally circular, reinforcing ribs are distributed along the circumferential periphery, and mounting points of the tail landing gear are uniformly distributed along the circumferential direction at a distance of 110mm.
(2) The periphery of the tail landing gear connecting joint is guaranteed to be L-shaped connecting surfaces, so that the transverse connecting plate 1 can be connected with the machine body frame, the vertical connecting plate 3 is connected with the machine body beam, meanwhile, the longitudinal connecting plate 2 can also be connected with the machine body frame beam, the joint can be installed from the bottom of the machine body in the connecting mode, and the maintenance and exchange of the connecting joint on the whole tail landing gear machine are facilitated.
(3) The tail landing gear connecting joint is formed by machining and integrally machining a plate.
The key technical points of the invention are as follows: the periphery of the joint is provided with the L-shaped connecting surfaces, so that the interchangeability and the maintainability of the joint can be realized. The joint structure is integrally formed by machining a plate, the structural form fully utilizes a topology optimization technology, and the load transmission efficiency is high; the design of the key joint is divided into two stages, and the assembling performance and the maintainability are taken as primary design targets; after the first-stage target is realized, the optimal distribution form of the main bearing ribs is searched by fully utilizing the topology optimization technology; a dimension optimization technology is adopted, and the specific thickness value of each block is determined; the stress control technology is adopted, and the requirements of static strength and fatigue strength are met.
The field assembly is simple, and the process has good feasibility of implementation; the structure is interchangeable, and the maintainability is obviously improved; the structure is passed and is carried the route and arrange rationally, passes and carries efficiency higher.
The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A tail landing gear attach fitting, comprising: two transverse connecting plates (1), two longitudinal connecting plates (2), four vertical connecting plates (3) and a tail landing gear connecting piece (4);
the two transverse connecting plates (1) and the two longitudinal connecting plates (2) form a quadrilateral structure, and the four vertical connecting plates (3) are correspondingly connected to the two transverse connecting plates (1) and the two longitudinal connecting plates (2) respectively;
the tail landing gear connecting piece (4) is positioned in the center of the four vertical connecting plates (3), the tail landing gear connecting piece (4) is a hollow bowl-shaped annular piece, and one circle of the hollow bowl-shaped annular piece is connected with the four vertical connecting plates (3) through reinforcing ribs;
the two transverse connecting plates (1) and the two vertical connecting plates (3) are fixedly connected with the machine body frame, and the two longitudinal connecting plates (2) and the two vertical connecting plates (3) are fixedly connected with the machine body beam;
the tail landing gear connecting plate is generally circular, reinforcing ribs are uniformly distributed along the circumferential periphery, and mounting points of the tail landing gear are uniformly distributed along the circumferential direction;
reinforcing ribs are uniformly distributed along the circumferential periphery, and each reinforcing rib is approximately in the shape of a sector;
reinforcing ribs for transferring the load of the undercarriage are arranged between the tail undercarriage connecting piece (4) and the four vertical connecting plates (3); the reinforcing ribs for transferring the load of the landing gear are symmetrical along the course of the helicopter.
2. A tail landing gear attachment joint according to claim 1, wherein the distance between adjacent tail landing gear mounting points is in the range 100mm to 120mm.
3. A tail landing gear attachment joint according to claim 1, wherein the two transverse webs (1), the two longitudinal webs (2) and the four vertical webs (3) are dimensioned in accordance with the positional correspondence of the fuselage frame and the fuselage beam.
4. A tail landing gear attachment joint according to claim 1, wherein the tail landing gear mounting point of the tail landing gear attachment (4) is attached to the tail landing gear by a fastener.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028749.9A CN112173083B (en) | 2020-09-25 | 2020-09-25 | Tail undercarriage attach fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028749.9A CN112173083B (en) | 2020-09-25 | 2020-09-25 | Tail undercarriage attach fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112173083A CN112173083A (en) | 2021-01-05 |
| CN112173083B true CN112173083B (en) | 2023-01-31 |
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| CN202011028749.9A Active CN112173083B (en) | 2020-09-25 | 2020-09-25 | Tail undercarriage attach fitting |
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| CN112173083A (en) | 2021-01-05 |
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