Triangular supporting structure for large truss type undercarriage

Abstract

The invention provides a triangular supporting structure for a large truss type landing gear, and belongs to the technical field of aircraft landing gear design, the triangular supporting structure comprises an upper support and a lower support, the upper support and the lower support are both of a rod structure, the upper support comprises a first connecting lug piece and a second connecting lug piece, the first connecting lug piece and the second connecting lug piece are distributed at the two ends and used for installing undercarriage supporting columns, the second connecting lug piece is used for being connected with an airframe structure, and a third connecting lug piece used for being connected with the lower support is arranged between the first connecting lug piece and the second connecting lug piece. The third connecting lug is not located on a connecting line of the first connecting lug and the second connecting lug. The two ends of the lower supporting rod are provided with a double-lug structure used for being connected with the third connecting lug piece of the upper supporting rod and a fourth connecting lug piece used for being connected with a machine body structure respectively, and the third connecting lug piece is inserted into the double-lug structure and connected with the double-lug structure through a bolt. A supporting section formed by the upper supporting rod and the lower supporting rod is perpendicular to the undercarriage supporting column.

Description

Technical Field

[0001] The present application belongs to the field of aircraft landing gear structure design, and in particular relates to a triangular support structure for a large truss landing gear. Background Art

[0002] In large truss landing gear structures, a triangular support structure is usually set at the upper end of the landing gear strut to fix the landing gear strut. The triangular support structure must meet both the load-bearing requirements and the structural layout requirements. Therefore, the quality of the triangular support structure design will directly affect the function of the truss landing gear. Since the design space of the truss landing gear has always been relatively cramped, the design of the triangular support structure is limited by many factors, which increases the design difficulty. Summary of the invention

[0003] The object of the present application is to provide a triangular support structure for a large truss landing gear to solve or alleviate at least one problem in the background technology.

[0004] The technical solution of the present application is: a triangular support structure for a large truss landing gear, comprising: an upper support and a lower support, both of which are rod-type structures, wherein the upper support comprises a first connecting ear piece for mounting a landing gear strut and a second connecting ear piece for connecting with a body structure, and a third connecting ear piece for connecting with the lower support is provided between the first connecting ear piece and the second connecting ear piece, wherein the third connecting ear piece is not located on the connecting line between the first connecting ear piece and the second connecting ear piece;

[0005] The two ends of the lower support rod are respectively provided with a double ear structure for connecting with the third connecting ear piece of the upper support rod and a fourth connecting ear piece for connecting with the body structure, and the third connecting ear piece is inserted into the double ear structure and connected by bolts;

[0006] Wherein, the support section formed by the upper support rod and the lower support is perpendicular to the landing gear strut.

[0007] Preferably, a first bearing is installed in the first connecting ear piece and the second connecting ear piece of the upper support.

[0008] Preferably, the first bearing is a spherical plain bearing.

[0009] Preferably, a first bushing is installed in the third connecting ear of the upper support.

[0010] Preferably, the first bushing is a metal wear-resistant bushing or a non-metal wear-resistant silicon carbide bushing or a non-metal wear-resistant ceramic bushing.

[0011] Preferably, a second bearing is provided in the fourth connecting ear of the lower support rod.

[0012] Preferably, the second bearing is a spherical plain bearing.

[0013] Preferably, a second bushing is installed in the double-ear structure of the lower support.

[0014] Preferably, the second bushing is a metal wear-resistant bushing or a non-metal wear-resistant silicon carbide bushing or a non-metal wear-resistant ceramic bushing.

[0015] Preferably, the upper support and the lower support are made of a material from a high-strength steel material group.

[0016] The triangular support structure for large truss landing gear provided by the present application can well adjust the gap accumulated by the assembly tolerance, release the heading load of the landing gear strut, and make the triangular support structure bear only lateral and vertical loads. In addition, the triangular support structure of the present application can prevent structural instability caused by too large swing angle of the joint bearing, and by adopting a segmented triangular support structure, the size of the forging is greatly reduced, and the processing and manufacturing costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0018] Figure 1 This is a schematic diagram of the triangular support structure used for a large truss landing gear in the present application.

[0019] Figure 2 This is a schematic diagram of the upper support in this application.

[0020] Figure 3 This is a schematic diagram of the lower support in this application.

[0021] Figure 4 This is a schematic diagram of the triangular support structure of this application in use. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0023] The present invention provides a triangular support structure for a large truss landing gear, which can not only meet the lateral support function, but also ensure that the directional load of the truss landing gear is directly transmitted to the front strut along the landing gear strut across the triangular support structure, and the truss landing gear itself does not bear the directional load; the structure is simple in layout and low in processing and manufacturing cost, and has great practical application value.

[0024] like Figures 1 to 4As shown, the triangular support structure 10 for a large truss landing gear provided by the present application includes an upper support 11 and a lower support 12 .

[0025] The upper support 11 and the lower support 12 are generally rod-type structures. Among them, three connecting lugs are arranged on the upper support 11, namely, the first connecting lug 111 for installing the landing gear strut 21 and the second connecting lug 112 for connecting to the body structure, which are distributed at both ends of the upper support 11. A third connecting lug 113 for connecting to the lower support 12 is provided in the middle of the upper support 11, and the third connecting lug 113 is not located on the connecting line between the first connecting lug 111 and the second connecting lug 112.

[0026] In the present application, bearings are installed in the first connecting lug 111 and the second connecting lug 112 to adjust the swing angle of the landing gear strut 21. Preferably, the bearings are spherical bearings.

[0027] One end of the lower support rod 12 is provided with a double-ear structure 121 and the other end is provided with a fourth connecting ear 122. The third connecting ear 133 of the upper support 11 is inserted into the double-ear structure 121 and connected by bolts. The fourth connecting ear 122 is used to connect to the body structure.

[0028] like Figure 4 As shown, the upper end of the landing gear strut 21 is hinged to the fuselage structure through the front strut 22. At this time, the landing gear strut 21 has a degree of freedom. The upper end of the landing gear strut 21 is installed in the first connecting ear 111 of the upper strut 11, the third connecting ear 113 of the upper strut 11 is connected to the lower support 12, and the second connecting ear 112 of the upper strut 11 and the fourth connecting ear 122 of the lower support 12 are simultaneously connected to the fuselage structure, and the supporting section formed by the upper strut 11 and the lower support 12 is perpendicular to the landing gear strut 21, so as to provide a stable support for the upper end of the landing gear strut 21.

[0029] In the present application, a bushing may be installed in the third connecting ear 113 of the upper support 11 to prevent the bolts and the upper support 11 from wearing when the upper support 11 is connected to the lower support 12. Further, the bushing may be a metal wear-resistant bushing, a non-metallic wear-resistant silicon carbide bushing, or a non-metallic wear-resistant ceramic bushing.

[0030] In the present application, a bearing is installed in the fourth joint ear piece 122 of the lower support 12, and the bearing is also a spherical bearing. Further, a bushing is installed in the double ear structure 121 of the lower support 12, and the bushing can also be a metal wear-resistant bushing, a non-metal wear-resistant silicon carbide bushing, or a non-metal wear-resistant ceramic bushing.

[0031] In some embodiments of the present application, the upper support 11 and the lower support 12 can be made of a material in the high-strength steel material group. The triangular support of the present application can transform complex in-plane loads into two simple two-force rods for bearing, and the height between the two points connected to the body structure is low, which is convenient for installation.

[0032] In some embodiments of the present application, a plurality of weight-reducing holes may be provided on the upper support 11 and the lower support 12 , thereby reducing the structural weight of the upper support 11 and the lower support 12 .

[0033] In the triangular support structure of the present application, the heading load can be released through the three joint bearings of the upper support 11 and the lower support 12 in the same plane along the heading. When the landing gear is lowered, the heading load of the landing gear strut 21 is smoothly transferred to the front strut 22, which itself only bears lateral and vertical loads.

[0034] The triangular support structure for large truss landing gear provided by the present application can well adjust the gap accumulated by the assembly tolerance, release the heading load of the landing gear strut, and make the triangular support structure bear only lateral and vertical loads. In addition, the triangular support structure of the present application can prevent structural instability caused by too large swing angle of the joint bearing, and by adopting a segmented triangular support structure, the size of the forging is greatly reduced, and the processing and manufacturing costs are reduced.

[0035] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A triangular support structure for a large truss landing gear, characterized in that: include: An upper support and a lower support, both of which are rod-type structures, wherein the upper support comprises a first connecting ear piece for mounting a landing gear strut and a second connecting ear piece for connecting to a fuselage structure, which are distributed at both ends, and a third connecting ear piece for connecting to the lower support is provided between the first connecting ear piece and the second connecting ear piece, wherein the third connecting ear piece is not located on the connecting line between the first connecting ear piece and the second connecting ear piece; The two ends of the lower support rod are respectively provided with a double ear structure for connecting with the third connecting ear piece of the upper support rod and a fourth connecting ear piece for connecting with the body structure, and the third connecting ear piece is inserted into the double ear structure and connected by bolts; Wherein, the support section formed by the upper support rod and the lower support is perpendicular to the landing gear strut.

2. The triangular support structure for a large truss landing gear according to claim 1, characterized in that: The first connecting ear piece and the second connecting ear piece of the upper support are provided with a first bearing installed therein.

3. The triangular support structure for a large truss landing gear according to claim 2, characterized in that: The first bearing is a spherical plain bearing.

4. The triangular support structure for a large truss landing gear according to claim 1, characterized in that: A first bushing is installed in the third connecting ear of the upper support.

5. The triangular support structure for a large truss landing gear according to claim 4, characterized in that: The first bushing is a metal wear-resistant bushing, a non-metal wear-resistant silicon carbide bushing, or a non-metal wear-resistant ceramic bushing.

6. The triangular support structure for a large truss landing gear according to claim 1, characterized in that: A second bearing is arranged in the fourth connecting ear of the lower support rod.

7. The triangular support structure for a large truss landing gear according to claim 6, characterized in that: The second bearing is a spherical plain bearing.

8. The triangular support structure for a large truss landing gear according to claim 1, characterized in that: A second bushing is installed in the double-ear structure of the lower support.

9. The triangular support structure for a large truss landing gear according to claim 1, characterized in that: The second bushing is a metal wear-resistant bushing, a non-metal wear-resistant silicon carbide bushing, or a non-metal wear-resistant ceramic bushing.

10. The triangular support structure for a large truss landing gear according to claim 1, characterized in that: The upper support and the lower support are made of a material from a high-strength steel material group.

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