Wave-transparent light integrated composite undercarriage

Abstract

The invention discloses a wave-transparent light integrated composite undercarriage which comprises a front arched beam, a rear arched beam, a right skid and a left skid, wherein the front arched beam, the rear arched beam, the right skid and the left skid are made of a resin-based fiber reinforced composite and are of an integrated structure; the front bow-shaped beam and the rear bow-shaped beam adopt an integrated herringbone structure, one side of the front bow-shaped beam and one side of the rear bow-shaped beam are provided with connecting joints, and the other side of the front bow-shaped beam and the other side of the rear bow-shaped beam are provided with waist-shaped hole connecting pieces; and the right skid and the left skid are provided with wear-resistant sheets and push wheel brackets. The integrally-formed light undercarriage provided by the invention not only meets the requirements of structural rigidity and strength, has a damping and buffering function, but also can transmit waves within 360 degrees in the circumferential direction of the belly.

Description

Technical Field

[0001] The present invention relates to the field of landing gear, and in particular to a wave-transparent lightweight integrated composite material landing gear. Background Art

[0002] The landing gear is a critical load-bearing component of an aircraft, requiring high structural strength, rigidity, shock absorption, and lightweight design. Furthermore, it must be wave-transparent and aesthetically pleasing. Landing gear is typically constructed of welded or mechanically connected tubing made of alloy steel, titanium alloy, or aluminum alloy. However, this structural design is not ideal for communications equipment mounted on the aircraft's belly.

[0003] Conventional wave-transmitting composite landing gear typically uses quartz fiber to form composite components, which are then machined to form metal or non-metallic connectors, which are then bonded together using adhesives or a combination of adhesives and rivets. This type of landing gear is complex and heavy, requiring high assembly precision. Furthermore, this assembly process can increase the landing gear's wall thickness or introduce metal components, severely impacting its wave-transmitting performance and increasing its weight.

[0004] In order to enhance communication capabilities, it is necessary to develop a new type of lightweight landing gear to overcome the problems of existing technologies. Summary of the Invention

[0005] Purpose of the invention: In view of the shortcomings and defects of the existing technology, the present invention provides a wave-transmitting lightweight integrated composite landing gear, which not only meets the structural strength requirements, has shock-absorbing and buffering functions, but also can transmit waves within 360° around the belly of the aircraft.

[0006] Technical solution: The present invention provides a wave-transmitting, lightweight, integrated composite landing gear, characterized in that it comprises a front bow beam, a rear bow beam, a right skid, and a left skid of an integrated structure made of resin-based fiber-reinforced composite material; the front bow beam and the rear bow beam adopt an integrated "human" shaped structure, and the front bow beam and the rear bow beam are provided with a connecting joint on one side and a waist-shaped hole connecting piece on the other side; the right skid and the left skid are provided with wear-resistant plates and push wheel brackets.

[0007] Wherein, the connecting joint is provided with a front joint and a rear joint which are connected to each other.

[0008] Wherein, the push wheel bracket is provided with a front bushing and a rear bushing, and the front bushing and the rear bushing are connected by a U-shaped connecting piece.

[0009] Wherein, the waist-shaped hole connecting piece is a waist-shaped hole structure.

[0010] Wherein, the bottom of the right skid and the left skid are bonded or riveted with wear-resistant sheets.

[0011] Wherein, the resin-based fiber-reinforced composite material includes high-strength glass fiber, aramid fiber, quartz fiber or other wave-transmitting fiber.

[0012] Among them, a "U"-shaped edging is designed below the transfer wheel connection holes of the right skid and the left skid.

[0013] The method for using the wave-transmitting, lightweight, integrated composite landing gear of the present invention is characterized in that when under pressure, the landing gear changes from a statically loaded landing gear to a compressed and deformed landing gear through a waist-shaped hole connector.

[0014] The preparation method of the wave-transmitting lightweight integrated composite landing gear of the present invention is characterized by: using Q235 steel to process a forming mold, the mold is a female mold combination mold, and the mold is designed and processed according to the product structure form. The front arched beam and the rear arched beam are a one-section mold, and the right skid and the left skid are each a one-section mold, and are assembled on an integral platform to form a combination mold; a mold release agent is brushed into the mold, and after drying, prepreg is laid in the mold, and the first layer and every 2 to 3 subsequent layers are vacuum-compacted to ensure low porosity and interlayer bonding performance; a built-in auxiliary pressurizing material is placed during the laying process, and the mold is closed after the laying is completed, and a curing furnace, an autoclave or an oven is used for heating and pressurizing, and the mold is demolded after the curing is completed.

[0015] The processed coreless composite landing gear is positioned on the assembly truss based on the profile, and circular holes and waist-shaped holes for connecting joints are drilled, as well as circular holes for push wheel brackets. The built-in support materials are removed through the openings. Structural adhesive or a mixture of adhesive and rivets are used to install wear-resistant plates, front joints, rear joints, front bushings, rear bushings, U-shaped connectors, bow beams and skids.

[0016] The wave-transparent, lightweight, integrated composite landing gear of the present invention is made of a resin-based fiber-reinforced composite material. The product is a special-shaped, variable-section tubular hollow structure, supplemented by connecting joints and wear-resistant sheets. The present invention also discloses a lightweight design and molding concept for a composite landing gear, which adopts an integrated "human"-shaped arched beam structure to reduce the weight of structural adhesives and rivets, increase the heading natural frequency, and enhance structural stability; then, the fibers are laid in a combined mold so that they are continuous along the main force transmission path, thereby improving mechanical properties; then, an internal pressurization process is used to apply pressure, and a heating device is used to heat and cure the product, thereby enhancing the interlayer bonding strength of the product; finally, the built-in pressurizer is removed, and the joints and wear-resistant sheets are installed to improve the shear resistance of the hole edges.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the arched beam support of the present invention is designed as a "human" shaped structure to increase the heading natural frequency; waist-shaped hole connectors are used to coordinate the deformation of the composite landing gear; the integrated design concept of the arched beam skid is used to reduce connections and reduce weight; high-hardness, wear-resistant and wave-transparent materials are used to replace transmission metal structural parts to improve wave transmission performance; the push wheel bracket is designed into the "human" shaped arched beam to improve the stress condition and reduce deformation; the composite landing gear is solidified and formed using internal pressurization, and finally all internal sandwich supports are removed to reduce weight and improve wave transmission performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a force diagram of the push wheel bracket of the present invention;

[0020] Figure 3 It is a front view structural schematic diagram of the connection joint of the present invention;

[0021] Figure 4 Schematic diagram of the cross-sectional structure of the connecting joint of the present invention;

[0022] Figure 5 It is a front view structural schematic diagram of the push wheel bracket of the present invention;

[0023] Figure 6 Schematic diagram of the cross-sectional structure of the push wheel bracket of the present invention;

[0024] Figure 7 It is a schematic diagram of the force deformation of the landing gear of the present invention;

[0025] Figure 8 This is a schematic diagram of the position of the connecting bolts in the waist-shaped holes of the landing gear after being loaded;

[0026] In the figure: 1 is the connecting joint; 2 is the front bow beam; 3 is the rear bow beam; 4 is the right skid; 5 is the wear-resistant plate; 6 is the left skid; 7 is the push wheel bracket; 8 is the front joint; 9 is the rear joint; 10 is the front bushing, 11 is the rear bushing; 12 is the U-shaped connector; 13 is the landing gear under static load; 14 is the landing gear after compression deformation; 15 is the position of the bolt in the waist-shaped hole before loading; 16 is the position of the bolt in the waist-shaped hole after loading. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0028] The wave-transmitting, lightweight, integrated composite landing gear of the present invention includes a front bow beam 2, a rear bow beam 3, a right skid 4, and a left skid 6, each of which is an integrated structure made of a resin-based fiber-reinforced composite material. The front bow beam 2 and the rear bow beam 3 adopt an integrated "human" shaped structure, with a connecting joint 1 provided on one side of the front bow beam 2 and the rear bow beam 3 and a waist-shaped hole connector on the other side. The right skid 4 and the left skid 6 are provided with wear-resistant plates 5 and a push wheel bracket 7. The integrated "human" shaped bow beam structure design reduces the weight of structural adhesive and rivets, increases the heading natural frequency, and enhances structural stability. The front bow beam 2, the rear bow beam 3, the left skid 6, and the right skid 4 adopt an integrated design concept, without any connecting parts between them, using a reliable integrated design concept instead of adhesive rivet connections.

[0029] The connecting joint 1 of the present invention is provided with a front joint 8 and a rear joint 9 that are connected to each other. The push wheel bracket 7 is provided with a front bushing 10 and a rear bushing 11, and the front bushing 10 and the rear bushing 11 are connected by a U-shaped connector 12. A waist-shaped hole connector is provided with a waist-shaped hole side bolt 15 on one side, and a waist-shaped hole other side bolt 16 on the other side. The right slide 4 and the left slide 6 are bonded or riveted with a wear-resistant sheet 5 at the bottom. Resin-based fiber-reinforced composite materials include high-strength glass fiber, aramid fiber, quartz fiber or other wave-transmitting fibers. A "U"-shaped edging is designed below the transfer wheel connection hole of the right slide 4 and the left slide 6.

[0030] The method for using the wave-transparent lightweight integrated composite landing gear of the present invention is as follows: when under pressure, the landing gear is connected to the waist-shaped hole and changes from a statically loaded landing gear 13 to a compressed and deformed landing gear 14.

[0031] The preparation method of the wave-transmitting lightweight integrated composite landing gear of the present invention uses Q235 steel to process a forming mold, the mold is a female mold combination mold, and is designed and processed according to the mold splitting form of the product structure. The front arched beam 2 and the rear arched beam 3 form a mold section, and the right skid 4 and the left skid 6 each form a mold section, and are assembled on an integral platform to form a combined mold; a mold release agent is brushed into the mold, and after drying, prepreg is laid in the mold, and the first layer and every 2 to 3 subsequent layers are vacuum-compacted to ensure low porosity and interlayer bonding performance; a built-in auxiliary pressurizing material is placed during the laying process, and the mold is closed after the laying is completed, and a curing furnace, an autoclave or an oven is used for heating and pressurizing, and the mold is demolded after the curing is completed.

[0032] The processed coreless composite landing gear is positioned on the assembly truss based on the profile, and waist-shaped holes for the connecting joint 1 and circular holes for the push wheel bracket 7 are drilled. The built-in support materials are removed through the openings. Structural adhesive or a mixture of adhesive and rivets are used to install the wear-resistant sheet 5, front joint 8, rear joint 9, front bushing 10, rear bushing 11, U-shaped connector 12, bow beam and skid.

[0033] The bow-shaped beam support of the present invention is designed as a "human" shaped structure to increase the heading natural frequency. The traditional landing gear support is a single pipe directly connected to the skid. In order to enhance stability, an additional "L"-shaped support structure is often added. This method alone increases weight and adds multiple connections. Waist-shaped hole connectors are used to coordinate the deformation of the composite landing gear. Under the large impact load during unconventional landing, the all-metal landing gear can rely on metal creep to absorb energy and reduce damage. Fiber-reinforced composite materials do not have a creep process and will break quickly when subjected to large loads. Therefore, the waist-shaped hole structure is designed to release the constraint between the two points when the landing gear deforms to meet the deformation requirements. The integrated design concept of the bow-beam skid is used to reduce the connection between the bow beam and the skid, thereby improving the overall performance and reducing the weight of the product.

[0034] The present invention uses polyetheretherketone, polytetrafluoroethylene or other high-hardness, wear-resistant and wave-transparent materials to replace traditional metal structural parts, thereby improving the wave-transparent performance. The push wheel bracket is designed to be placed on one of the supporting legs of the "human"-shaped arch beam, replacing the original push wheel bracket located in the sled design, so as to reduce the deformation of the sled during the transfer condition. High-strength glass fiber, aramid fiber, quartz fiber and other wave-transparent fibers are used as reinforcing materials, and internal pressurization auxiliary measures such as foam, silicone rubber, and inflatable bags are used. The equipment is cured and formed by heating and pressurizing equipment such as autoclaves, curing furnaces, and hot presses. A wear-resistant sheet is glued or riveted to the bottom of the sled, and a "U"-shaped edging is designed below the transfer wheel connection hole to reduce the wear of the landing gear during transportation and take-off and landing stages.

[0035] The present invention utilizes the innovative structural design of the "human"-shaped arched beam to enhance directional stability; innovatively designs waist-shaped holes to compensate for manufacturing errors, while serving as a deformation sliding device to coordinate the deformation of the arched beam and reduce damage; uses high-strength fiber cloth to improve the product's wave transmission performance; uses an integrated design and manufacturing approach to enhance integrity and reduce product weight; uses internal pressurization to enhance the bonding strength between fiber cloth layers, and removes built-in objects to reduce weight and increase wave transmission; increases the product's hole edge extrusion capacity by adding joints, and adds wear-resistant sheets to enhance the wear resistance of the landing gear during transportation and take-off and landing stages.

Claims

1. A wave-transmitting, lightweight, integrated composite landing gear, characterized by: The invention comprises a front bow beam (2), a rear bow beam (3), a right skid (4) and a left skid (6) of an integrated structure made of a resin-based fiber-reinforced composite material; the front bow beam (2) and the rear bow beam (3) adopt an integrated "human" shaped structure, and the front bow beam (2) and the rear bow beam (3) are provided with waist-shaped hole connecting joints (1); the right skid (4) and the left skid (6) are provided with wear-resistant plates (5) and push wheel brackets (7).

2. The wave-transmitting, lightweight, integrated composite landing gear according to claim 1, characterized in that: The connecting joint (1) is provided with a front joint (8) and a rear joint (9) which are connected to each other.

3. The wave-transmitting, lightweight, integrated composite landing gear according to claim 1, characterized in that: The push wheel bracket (7) is provided with a front bushing (10) and a rear bushing (11), and the front bushing (10) and the rear bushing (11) are connected via a U-shaped connecting piece (12).

4. The wave-transmitting, lightweight, integrated composite landing gear according to claim 1, characterized in that: The bottom of the right slide (4) and the left slide (6) is bonded or glue-riveted with a wear-resistant sheet (5).

5. The wave-transmitting, lightweight, integrated composite landing gear according to claim 1, characterized in that: The resin-based fiber-reinforced composite material includes high-strength glass fiber, aramid fiber, quartz fiber or other wave-transmitting fibers.

6. The wave-transmitting, lightweight, integrated composite landing gear according to claim 1, characterized in that: A "U"-shaped edging is designed below the transfer wheel connection holes of the right skid (4) and the left skid (6).

7. The method for using the wave-transmitting, lightweight, integrated composite landing gear according to any one of claims 1 to 6, characterized in that: When under pressure, the landing gear changes from a static load landing gear (13) to a pressure-deformed landing gear (14) through the waist-shaped hole connecting piece. The position of the bolt connecting the waist-shaped hole relative to the waist-shaped hole changes from (15) to (16).

8. The method for preparing a wave-transmitting, lightweight, integrated composite landing gear according to any one of claims 1 to 6, characterized in that: The forming mold is made of Q235 steel, and the mold is a female mold combination mold. The mold is designed and processed according to the product structure. The front arch beam (2) and the rear arch beam (3) are a mold section, and the right slide (4) and the left slide (6) are each a mold section. They are assembled on an integral platform to form a combination mold; a mold release agent is brushed in the mold, and after drying, prepreg is laid in the mold. The first layer and every 2 to 3 subsequent layers are vacuum-compacted to ensure low porosity and interlayer bonding performance; built-in auxiliary pressurizing material is placed during the laying process, and the mold is closed after the laying is completed. A curing furnace, an autoclave or an oven is used for heating and pressurizing, and the mold is demoulded after the curing is completed.

9. The method for preparing a wave-transmitting, lightweight, integrated composite landing gear according to claim 8, characterized in that: The processed coreless composite landing gear is positioned on the assembly truss by relying on the profile, and waist-shaped holes for the connecting joint (1) and circular holes for the push wheel bracket (7) are drilled. The built-in support material is taken out through the openings; and the wear-resistant sheet (5), the front joint (8), the rear joint (9), the front bushing (10), the rear bushing (11), the U-shaped connector (12), the bow beam and the skid are installed using structural adhesive or a mixed form of adhesive and rivets.

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