Hydraulic hose guide structure based on large-stroke main prop

Abstract

The utility model belongs to the field of aircraft landing gear system design, and relates to a hydraulic hose guide structure based on a large-stroke main supporting column, which comprises an M-shaped part, a sleeve assembly supporting part, an anti-torsion arm fixing part, a first hose double-layer sleeve and a second hose double-layer sleeve, an annular installation area is formed between the M-shaped part and the sleeve assembly supporting part, and the first hose double-layer sleeve and the second hose double-layer sleeve are installed in the annular installation area. The two groups of hydraulic hoses are respectively inserted into the first hose double-layer sleeve and the second hose double-layer sleeve; the first hose double-layer sleeve and the second hose double-layer sleeve are both of a double-layer structure, the inner layers of the first hose double-layer sleeve and the second hose double-layer sleeve are hoses, and the outer layers are hard pipes. Through the design of the double-layer sleeve with hard outside and soft inside, the friction coefficient is effectively reduced while the structural stability is guaranteed, and the function of preventing the hose from being abraded is achieved.

Description

Technical Field

[0001] The present application belongs to the field of aircraft landing gear system design, and in particular relates to a hydraulic hose guide structure based on a long-stroke main lifting strut. Background Art

[0002] In aircraft hydraulic system design, to meet system requirements such as wheel braking, turning and landing gear retraction and extension, hydraulic lines need to be arranged along the main lifting struts, that is, through the upper and lower anti-torsion arms of the main lifting buffer struts. To meet the movement of the mechanism, the hydraulic lines are connected through hoses, rotary joints, etc. When arranging the hydraulic hoses of the main lifting struts of a certain aircraft, it was discovered that the traditional hose hydraulic guide sleeves rubbed against the hydraulic hoses during use, causing wear on the hose surface and leading to oil leakage from the hoses. Based on this problem, the limit and guide design of the hydraulic hoses on the main lifting struts were optimized to solve the problem of wear between the hoses and the guide limit structure. Utility Model Content

[0003] The purpose of this application is to provide a hydraulic hose guide structure based on a large-stroke main lifting strut to solve the problem in the prior art that the hose and the guide limit sleeve cause mutual friction when the aircraft buffer strut is compressed and extended, resulting in wear and even oil leakage of the hose protective cover.

[0004] The technical solution of the present application is: a hydraulic hose guide structure based on a large-stroke main lifting support, including a guide limit assembly, the guide limit assembly includes an M-shaped part, a sleeve assembly support part, an anti-torsion arm fixing part, a first hose double-layer sleeve and a second hose double-layer sleeve; the M-shaped part, the sleeve assembly support part and the anti-torsion arm fixing part are connected to each other by bolts; an annular installation area is formed between the M-shaped part and the sleeve assembly support part, and the first hose double-layer sleeve and the second hose double-layer sleeve are installed in the annular installation area; there are two groups of hydraulic hoses and they are respectively inserted into the first hose double-layer sleeve and the second hose double-layer sleeve; the first hose double-layer sleeve and the second hose double-layer sleeve are both double-layer structures and the inner layer of the first hose double-layer sleeve and the second hose double-layer sleeve is a hose and the outer layer is a hard tube.

[0005] Preferably, the first hose double-layer casing and the second hose double-layer casing each include an outer metal guide tube and an inner polytetrafluoroethylene tube, the outer metal guide tube is made of metal material, and the inner polytetrafluoroethylene tube is made of polytetrafluoroethylene material.

[0006] Preferably, the gap between the inner diameter of the outer metal guide tube and the outer diameter of the inner polytetrafluoroethylene tube is 1-2 mm; both ends of the inner polytetrafluoroethylene tube are provided with outward flanges, which abut against the ends of the outer metal guide tube.

[0007] Preferably, a notch is provided at the flange of the inner polytetrafluoroethylene tube, the notch gap is 1-2 mm, and the wall thickness of the inner polytetrafluoroethylene tube is 2-3 mm.

[0008] The present invention discloses a hydraulic hose guide structure for a long-stroke main lift support, comprising an M-shaped component, a sleeve assembly support component, an anti-torsion arm fixing component, a first hose double-layer sleeve, and a second hose double-layer sleeve. An annular mounting area is formed between the M-shaped component and the sleeve assembly support component, within which the first hose double-layer sleeve and the second hose double-layer sleeve are mounted. Two sets of hydraulic hoses are inserted into the first hose double-layer sleeve and the second hose double-layer sleeve, respectively. Both the first hose double-layer sleeve and the second hose double-layer sleeve are double-layer structures, with the inner layer being a hose and the outer layer being a hard tube. This double-layer sleeve design, with a hard outer layer and a soft inner layer, effectively reduces the friction coefficient while ensuring structural stability, thus preventing hose wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0010] Figure 1 Use the environment map for this application;

[0011] Figure 2-1 This is a front view of the guide and limit assembly of this application; Figure 2-2 This is the left view of the guide limit assembly of this application;

[0012] Figure 3 Bottom view of the first hose double-layer casing and the second hose double-layer casing of this application;

[0013] Figure 4 This is a cross-sectional view of the second double-layer hose of this application.

[0014] 1. Upper anti-torsion arm; 2. Lower anti-torsion arm; 3. Hydraulic hose; 4. Guide limit assembly; 4-1. M-shaped part; 4-2. Casing assembly support part; 4-3. Anti-torsion arm fixing part; 4-4. Double-layer casing for the first hose; 4-5. Double-layer casing for the second hose; 4-5-1. Outer metal guide tube; 4-5-2. Inner polytetrafluoroethylene tube. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] A hydraulic hose guide structure based on a large stroke main lifting support, such as Figure 1 As shown, it includes two sets of guide and limiter assemblies 4. These two sets of guide and limiter assemblies 4 are respectively mounted on two sets of hydraulic hoses 3 and connected to the upper anti-torsion arm 1 via bolts. The two hydraulic hoses 3 are arranged along the outer sides of the upper anti-torsion arm 1 and the lower anti-torsion arm 2. When the main lifting buffer strut is compressed, the guide and limiter assemblies 4 move with the movement of the upper anti-torsion arm 1, and the hydraulic hoses 3 move up and down inside the guide and limiter assemblies 4 to meet the movement requirements of the hydraulic hoses 3 when the buffer strut is extended or retracted.

[0017] Combine Figure 2-1 、 Figure 2-2 and Figure 3 The guide and limiter assembly 4 includes an M-shaped component 4-1, a sleeve assembly support component 4-2, an anti-torsion arm fixing component 4-3, a first hose double-layer sleeve 4-4, and a second hose double-layer sleeve 4-5. The M-shaped component 4-1, sleeve assembly support component 4-2, and anti-torsion arm fixing component 4-3 are connected to each other via bolts. The bolt grade and length are determined by the thickness and clearance between the various components.

[0018] An annular mounting area is formed between the M-shaped element 4-1 and the sleeve assembly support element 4-2. The first and second double-layer hose sleeves 4-4 and 4-5 are mounted within this annular mounting area. The specific mounting position is adjustable, up and down along the axis of the annular mounting area. This adjustment allows for fine-tuning of the hose limit guide path, addressing structural interference issues when the landing gear struts are retracted into the wheel wells after the hoses are installed.

[0019] When the hydraulic hose 3 moves up and down inside the guide and stop assembly 4, there is friction between the hydraulic hose 3 and the inner wall of the guide and stop assembly 4, which may cause wear of the protective layer of the hydraulic hose 3. Reducing this friction coefficient will greatly reduce hose wear.

[0020] In order to reduce wear, the first hose double-layer sleeve 4-4 and the second hose double-layer sleeve 4-5 are both designed with a double-layer structure. The first hose double-layer sleeve 4-4 and the second hose double-layer sleeve 4-5 have the same structure. The second hose double-layer sleeve 4-5 is used as an example for explanation below:

[0021] Combine Figure 4The second hose double-layer casing 4-5 includes an outer metal guide tube 4-5-1 and an inner polytetrafluoroethylene tube 4-5-2. The outer metal guide tube 4-5-1 and the inner polytetrafluoroethylene tube 4-5-2 are assembled using a thermoplastic process. The outer metal guide tube 4-5-1 is made of metal, such as steel or aluminum alloy, and is primarily responsible for supporting the strength and rigidity of the structure. It withstands the impact load transmitted from the main lifting strut anti-torsion arm of the aircraft's main lifting strut at the moment of landing. The inner polytetrafluoroethylene tube 4-5-2 is made of polytetrafluoroethylene, which has a low friction coefficient and prevents hose wear. The double-layer casing design, with a hard outer layer and a soft inner layer, effectively reduces the friction coefficient while ensuring structural stability.

[0022] The lengths of the outer metal guide tube 4-5-1 and the inner polytetrafluoroethylene tube 4-5-2 are determined according to the actual installation situation to ensure that the movement of the hose does not interfere after installation.

[0023] The diameters of the outer metal guide tube 4-5-1 and the inner polytetrafluoroethylene tube 4-5-2 are selected based on the size of the hose connector. The diameters must be selected to ensure that the hose can be smoothly inserted into the casing without getting stuck, while also being as small as possible to reduce the overall weight.

[0024] The gap between the inner diameter of the outer metal guide tube 4-5-1 and the outer diameter of the inner polytetrafluoroethylene tube 4-5-2 should not be too large or too small, and a gap of 1-2 mm is appropriate, which can ensure that the two layers of sleeves can be put together after thermoplastic processing without generating gap shaking.

[0025] Both ends of the inner polytetrafluoroethylene tube 4-5-2 are provided with outward flanges, which abut against the end of the outer metal guide tube 4-5-1, so that the outer metal guide tube 4-5-1 and the inner polytetrafluoroethylene tube 4-5-2 fit more tightly and prevent contact friction between the outer metal guide tube 4-5-1 and the hydraulic hose 3.

[0026] The inner polytetrafluoroethylene tube 4-5-2 is provided with a notch at the flange, and the notch gap is 1-2 mm, which can play a role in the installation and positioning of the outer metal guide tube 4-5-1 and the inner polytetrafluoroethylene tube 4-5-2.

[0027] The wall thickness of the inner polytetrafluoroethylene tube 4-5-2 should be no more than 2-3mm. If the wall thickness is too thick, it will be difficult to assemble after thermoforming; if the wall thickness is too thin, the service life will be affected due to flanging.

[0028] Finally, it should be noted that the drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0029] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic hose guide structure based on a long-stroke main lifting support, characterized by: The invention comprises a guide and limit assembly (4), wherein the guide and limit assembly (4) comprises an M-shaped part (4-1), a sleeve assembly supporting part (4-2), an anti-torsion arm fixing part (4-3), a first hose double-layer sleeve (4-4), and a second hose double-layer sleeve (4-5); the M-shaped part (4-1), the sleeve assembly supporting part (4-2), and the anti-torsion arm fixing part (4-3) are connected to each other by bolts; a ring is formed between the M-shaped part (4-1) and the sleeve assembly supporting part (4-2); The invention relates to an installation area, wherein the first hose double-layer sleeve (4-4) and the second hose double-layer sleeve (4-5) are installed in the annular installation area; there are two groups of hydraulic hoses (3) and they are respectively inserted into the first hose double-layer sleeve (4-4) and the second hose double-layer sleeve (4-5); the first hose double-layer sleeve (4-4) and the second hose double-layer sleeve (4-5) are both double-layer structures, and the inner layer of the first hose double-layer sleeve (4-4) and the second hose double-layer sleeve (4-5) is a hose and the outer layer is a hard tube.

2. The hydraulic hose guide structure based on the long-stroke main lifting support according to claim 1, characterized in that: The first hose double-layer casing (4-4) and the second hose double-layer casing (4-5) both comprise an outer metal guide tube (4-5-1) and an inner polytetrafluoroethylene tube (4-5-2); the outer metal guide tube (4-5-1) is made of metal material, and the inner polytetrafluoroethylene tube (4-5-2) is made of polytetrafluoroethylene material.

3. The hydraulic hose guide structure based on the long-stroke main lifting support according to claim 2, characterized in that: The gap between the inner diameter of the outer metal guide tube (4-5-1) and the outer diameter of the inner polytetrafluoroethylene tube (4-5-2) is 1-2 mm; both ends of the inner polytetrafluoroethylene tube (4-5-2) are provided with outward flanges, which abut against the end of the outer metal guide tube (4-5-1).

4. The hydraulic hose guide structure based on a long-stroke main lifting support according to claim 3, characterized in that: The inner polytetrafluoroethylene tube (4-5-2) is provided with an incision at the flange, the incision gap is 1-2 mm, and the wall thickness of the inner polytetrafluoroethylene tube (4-5-2) is 2-3 mm.

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