Tubular beam and design method thereof

Abstract

The invention relates to the technical field of tubular beams, and provides a tubular beam and a design method thereof. The tubular beam comprises a tubular beam body and tubular beam end covers, a cavity is formed in the tubular beam body and used for storing gas, and ports are formed in the two ends of the tubular beam body; the tubular beam end covers are arranged at the ports in a one-to-one correspondence manner; wherein the tubular beam body and the tubular beam end covers are made of aluminum alloy, and the aluminum alloy comprises the following components in percentage by weight: 1.0%-7.0% of Mg, 1.0%-3.0% of Cu, 1.0%-5.0% of Zn, 0.2%-0.7% of Mn, 0.01%-0.03% of Cr, 0.1%-0.5% of Zr, less than 0.15% of Fe, less than 0.02% of other impurity elements and the balance of aluminum. According to the invention, the defect of limited weight reduction capacity of a tubular beam in the prior art is overcome, and a lighter tubular beam is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of tube beams, and in particular to a tube beam and a design method thereof. Background Art

[0002] The tubular beam is one of the main components of the vehicle frame, used to support the vehicle body and bear various loads. The tubular beam is widely used in trucks, off-road vehicles, pickups and other special vehicles that require a strong chassis. Vehicle lightweighting can improve transportation efficiency, driving safety, reduce fuel consumption, etc. The tubular beam is a large part in the vehicle, so the lightweighting of the tubular beam has an extremely obvious weight reduction effect on the entire vehicle. The existing tubular beam has limited weight reduction capacity, so it is necessary to design a lighter tubular beam. Summary of the invention

[0003] The present invention provides a tubular beam and a design method thereof, which are used to solve the defect of limited weight reduction capacity of tubular beams in the prior art and realize a lighter tubular beam.

[0004] The present invention provides a pipe beam comprising: a pipe beam body and a pipe beam end cover, wherein the pipe beam body has a cavity inside, the cavity is used for gas storage, and ports are provided at both ends of the pipe beam body; the pipe beam end covers are arranged at the ports in a one-to-one correspondence; wherein the pipe beam body and the pipe beam end covers are both made of aluminum alloy, and the components of the aluminum alloy include, by weight percentage: Mg: 1.0%-7.0%, Cu: 1.0%-3.0%, Zn: 1.0%-5.0%, Mn: 0.2%-0.7%, Cr: 0.01%-0.03%, Zr: 0.1%-0.5%, Fe<0.15%, other impurity elements are less than 0.02%, and the balance is aluminum.

[0005] According to a tubular beam provided by the present invention, the tubular beam body comprises a tubular body, the cross section of the tubular body is circular, and end portions are provided at both ends of the tubular body, and the end portions are used for detachably connecting with the tubular beam end covers.

[0006] According to a tubular beam provided by the present invention, the side wall of the tube body is provided with an air inlet hole and a mounting hole communicated with the cavity, and the air inlet hole and the mounting hole are arranged at intervals.

[0007] According to a tubular beam provided by the present invention, the side wall of the tubular body is provided with a plurality of mounting portions, and the mounting portions are provided with mounting holes.

[0008] According to a tubular beam provided by the present invention, the side wall of the tubular body is further provided with a drainage hole, and the drainage hole is located at the bottom of the tubular body in an assembled state.

[0009] According to a tubular beam provided by the present invention, when the tube body is in an assembled state, the middle of the cavity is lower than both ends of the cavity, and the drainage hole is connected to the middle part of the cavity.

[0010] According to a tubular beam provided by the present invention, an end cover limiting portion is provided on the outer periphery of the port, the end cover limiting portion is used to limit the tubular beam end cover, and a sealing member is provided between the tubular beam end cover and the end portion.

[0011] According to a pipe beam provided by the present invention, the end portion is provided with a first sealing ring groove, and the pipe beam end cover is provided with a second sealing ring groove, and the first sealing ring groove and the second sealing ring groove are arranged correspondingly; when the pipe beam end cover is limited to the end cover limiting portion, the first sealing ring groove and the second sealing ring groove enclose a closed cavity, and the sealing component is located inside the closed cavity.

[0012] According to a tubular beam provided by the present invention, a protrusion is provided between the end cover limiting portion and the port; a blocking portion is provided in the center of the tubular beam end cover, and a limiting groove is provided on the outer periphery of the blocking portion, and the limiting groove is matched with the protrusion; when the tubular beam end cover is limited to the end cover limiting portion, the protrusion is limited to the limiting groove, and the blocking portion blocks the port.

[0013] The present invention also provides a tubular beam design method, comprising: Establishing an initial three-dimensional model of the tube beam according to the assembly condition, bending and bending-torsion conditions of the tube beam; Defining the material properties of the aluminum alloy, and performing simulation and stress analysis on the three-dimensional model of the tubular beam according to the material properties of the aluminum alloy; Modify the 3D model and repeat the above steps until the safety factor of the simulation result is greater than the corresponding cast iron part and the maximum displacement does not change significantly.

[0014] The aluminum alloy used in the tubular beam provided by the present invention not only has a high strength-to-weight ratio, but also has excellent corrosion resistance and processing performance. Specifically, through the reasonable proportion of elements such as magnesium (Mg), copper (Cu), zinc (Zn), manganese (Mn), chromium (Cr) and zirconium (Zr) in the alloy, the mechanical strength and toughness of the material are effectively improved, while the density is reduced, thereby achieving effective weight reduction under the premise of ensuring structural rigidity and bearing capacity.

[0015] In addition, the cavity design inside the tube beam body further enhances the lightweight effect of the overall structure. By removing unnecessary solid parts and retaining key stress-bearing areas, the components can achieve better mass distribution while meeting mechanical requirements. This hollow section design not only reduces material usage, but also provides space for possible subsequent reinforcement measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is an exploded view of the tube beam provided by the present invention.

[0018] Figure 2 It is a cross-sectional view of the tube beam provided by the present invention.

[0019] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0020] Figure 4 It is a structural schematic diagram of the tube beam body of the tube beam provided by the present invention.

[0021] Figure 5 It is a schematic structural diagram of a tube beam end cover of a tube beam provided by the present invention.

[0022] Figure 6 It is a flow chart of the design method of the tubular beam provided by the present invention.

[0023] Figure numerals: 100: tube beam body; 110: tube body; 120: end; 121: first threaded hole; 122: end cover limiting portion; 123: first sealing ring groove; 124: raised portion; 125: port; 130: cavity; 140: air inlet; 150: mounting hole; 160: drainage hole; 170: exhaust hole; 200: tube beam end cover; 210: second threaded hole; 220: second sealing ring groove; 230: limiting groove; 240: blocking portion. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] Combine the following Figure 1-Figure 6 The invention describes a tubular beam and a design method of the tubular beam.

[0030] Figure 1 The exploded diagram of the pipe beam provided by the embodiment of the present invention is illustrated. Figure 1 , a pipe beam provided by an embodiment of the present invention includes a pipe beam body 100 and a pipe beam end cap 200. The pipe beam body 100 has a cavity 130 inside, and ports 125 are provided at both ends of the pipe beam body 100; the pipe beam end caps 200 are arranged at the ports 125 in a one-to-one correspondence; the pipe beam body 100 and the pipe beam end caps 200 are both made of aluminum alloy, and the components of the aluminum alloy include by weight percentage: Mg: 1.0%-7.0%, Cu: 1.0%-3.0%, Zn: 1.0%-5.0%, Mn: 0.2%-0.7%, Cr: 0.01%-0.03%, Zr: 0.1%-0.5%, Fe<0.15%, other impurity elements are less than 0.02%, and the balance is aluminum. The mechanical properties of the aluminum alloy are: yield strength 300-450MPa, tensile strength 350-500MPa, and elongation 5-12%.

[0031] The aluminum alloy used in the present invention not only has a high strength-to-weight ratio, but also has excellent corrosion resistance and processing performance. Specifically, through the reasonable proportion of elements such as magnesium (Mg), copper (Cu), zinc (Zn), manganese (Mn), chromium (Cr) and zirconium (Zr) in the alloy, the mechanical strength and toughness of the material are effectively improved, while the density is reduced, thereby achieving effective weight reduction under the premise of ensuring structural rigidity and load-bearing capacity.

[0032] In addition, the design of the cavity 130 inside the tube beam body 100 further enhances the lightweight effect of the overall structure. By removing unnecessary solid parts and retaining key stress-bearing areas, the components can achieve better mass distribution while meeting mechanical requirements. This hollow section design not only reduces the amount of material used, but also provides space for possible subsequent strengthening measures, such as setting internal reinforcement ribs to enhance the bending resistance of local areas.

[0033] Furthermore, the design of the end caps ensures the sealing and integrity of both ends of the tube beam, prevents the external environment from affecting the internal structure, and is also convenient for installation and maintenance. Overall, the present invention improves the overall performance of the vehicle through the above lightweight design, including but not limited to transportation efficiency, driving safety and fuel economy.

[0034] In some possible embodiments, computer-aided engineering tools can be used to perform topological optimization on the pipe beam, remove unnecessary material parts, and retain key load-bearing areas. The wall thickness and shape of different parts can also be designed according to the results of the force analysis to make the material distribution more reasonable. For pipe beams with complex shapes, extrusion molding technology can be used to reduce subsequent processing steps. In addition, in order to extend the life of the pipe beam, it can be anodized to improve the corrosion resistance and wear resistance of the aluminum alloy surface. Alternatively, a high-performance anti-corrosion coating can be applied to its surface to protect the aluminum alloy from environmental erosion.

[0035] In some other possible embodiments, reinforcing ribs may be provided inside the tube body 110 to enhance the rigidity of local areas, especially in high stress areas. This internal reinforcement design method can significantly improve the overall structural performance of the tube beam without significantly increasing the weight.

[0036] Figure 2 A cross-sectional view of a tubular beam provided by an embodiment of the present invention is illustrated. Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0037] Reference Figure 2 and Figure 3 In some embodiments of the present invention, the tube beam body 100 includes a tube body 110 , the cross section of the tube body 110 is circular, and ends 120 are provided at both ends of the tube body 110 , and the ends 120 are used to be detachably connected to the tube beam end cover 200 .

[0038] In the above structure, the circular cross section can evenly distribute the external load and reduce stress concentration, so the tube body 110 with a circular cross section has excellent bending and torsion resistance. This shape design also reduces the amount of material used, further reducing the overall weight while maintaining the necessary rigidity and strength. Furthermore, the circular cross section also has advantages in fluid dynamics, which can reduce air resistance, thereby improving the driving efficiency of the vehicle.

[0039] The detachable connection between the end 120 and the tube beam end cover 200, such as a bolt connection or a quick release device, is not only convenient for installation and disassembly, but also conducive to subsequent maintenance and inspection. This design allows damaged parts to be quickly replaced when necessary, reducing maintenance costs and time. The detachable connection makes the entire tube beam structure more flexible and can be adjusted and optimized according to different application requirements. When the end 120 and the tube beam end cover 200 are connected by bolts, a plurality of first threaded holes 121 are provided on the end 120, and a plurality of second threaded holes 210 are provided on the tube beam end cover 200, wherein the first threaded holes 121 and the second threaded holes 210 are arranged in a one-to-one correspondence. In order to facilitate connection, the end 120 can be a sheet-like structure, and the area of ​​the connection surface of the end 120 is larger than the cross-sectional area of ​​the tube body 110.

[0040] As for the connection method between the tube body 110 and the end 120, the two can be an integrally molded setting. The integrally molded tube body 110 and the end 120 eliminate the seams in the traditional connection method and reduce potential stress concentration points. This seamless design can provide a more uniform stress distribution, thereby improving the stability and durability of the overall structure. Secondly, one-piece molding can reduce assembly steps and simplify the production process. This not only reduces production costs, but also improves production efficiency. The one-piece molding setting can also ensure the high consistency and high precision of each component, and can minimize material waste, improve material utilization, and further reduce production costs. Furthermore, due to the higher structural integrity and reliability, the one-piece molded pipe beam requires less maintenance during use because there is no need for frequent inspection and maintenance of the connection parts, thereby reducing long-term operating costs.

[0041] Reference Figure 1 In some embodiments of the present invention, the side wall of the tube body 110 is provided with an air inlet 140 and an air outlet 170 communicating with the cavity 130, wherein the air inlet 140 and the air outlet 170 are arranged at intervals.

[0042] In the above structure, the air inlet 140 allows external gas to enter the cavity 130, while the exhaust hole 170 is used to exhaust the gas in the cavity 130, thereby ensuring the effective management and flow of the gas in the cavity 130. Through this design, the exhaust of gas can be optimized during the manufacturing process, the formation of internal defects such as bubbles and cavities can be reduced, and the quality and consistency of castings or extrusions can be improved. In addition, in practical applications, the cavity 130 is used as a gas storage space, and the air inlet 140 and the exhaust hole 170 work together to achieve a dynamic balance of gas. When it is necessary to inflate the cavity 130, the air inlet 140 introduces external gas to make the pressure in the cavity 130 reach the required level; when it is necessary to exhaust excess gas or perform maintenance, the exhaust hole 170 effectively exhausts the gas in the cavity 130 to prevent excessive internal pressure or accumulation of harmful substances. This design not only improves the overall structural strength and stability of the pipe beam, but also enhances its reliability and durability under various working conditions, while facilitating maintenance and inspection, ensuring the long-term performance and service life of the pipe beam.

[0043] It should be noted that when designing the air inlet 140 and the exhaust hole 170 on the side wall of the tube body 110, multiple key factors need to be considered comprehensively to ensure the effectiveness of their functions and the safety of the structure. First of all, the location selection of the air inlet 140 and the exhaust hole 170 is crucial, and they should be located in an area that can effectively manage the flow of gas and will not affect the overall structural strength. High points or areas where gas easily accumulates are ideal choices, so that natural gravity and airflow characteristics can be utilized to ensure smooth entry and discharge of gas. The size of the air inlet 140 and the exhaust hole 170 should be moderate, neither too large to reduce the structural strength, nor too small to effectively manage the gas flow. Reasonable size design needs to be accurately determined in combination with the specific application environment and manufacturing process to ensure that the gas can pass smoothly while maintaining the integrity of the structure.

[0044] Secondly, in order to prevent external contaminants from entering the cavity 130, the air inlet 140 and the exhaust hole 170 may need to be properly sealed in actual applications. The selection of sealing materials should take into account factors such as durability, corrosion resistance and ease of maintenance to ensure long-term reliability. In addition, optimizing the design of the air inlet 140 and the exhaust hole 170 through fluid mechanics analysis (such as CFD simulation) can ensure that the gas can enter and exit smoothly while avoiding vortices or other adverse flow phenomena, thereby improving gas management efficiency and reducing internal stress concentration.

[0045] Furthermore, in order to compensate for the local strength loss caused by the openings, appropriate reinforcement structures should be provided around the air inlet 140 and the air outlet 170. Specifically, the wall thickness can be increased to ensure that the structural strength of the opening area is not affected.

[0046] Reference Figure 1In some embodiments of the present invention, the side wall of the tube body 110 is provided with a plurality of mounting parts, each of which is provided with a mounting hole 150 , and the mounting parts are used to be connected with other parts.

[0047] In the above structure, through these mounting holes 150, bolts, pins or other fasteners can be used to firmly connect the tube beam with other vehicle components (such as suspension system, body frame, powertrain, etc.). This design not only ensures the integrity and stability of the structure, but also provides flexible assembly and disassembly methods, which is convenient for maintenance and replacement of parts. The design of the mounting part enables the tube beam to form a solid whole with other key components of the vehicle, thereby effectively transmitting and dispersing the load and improving the rigidity and durability of the entire vehicle chassis. In addition, a reasonable mounting part layout and the location selection of the mounting holes 150 can optimize stress distribution, reduce local stress concentration, and further enhance the safety and reliability of the structure. In short, in this way, the mounting part not only simplifies the assembly process and improves production efficiency, but also ensures a reliable connection between the tube beam and other components in practical applications, thereby improving the overall performance and service life of the vehicle.

[0048] It should be noted that when designing the mounting portion of the side wall of the tube body 110, multiple key factors need to be comprehensively considered to ensure the effectiveness of its function and the safety of the structure. First, the location of the mounting portion should be located in an area that can effectively transfer the load and will not affect the overall structural strength. Alternatively, the location and layout of the mounting portion should be convenient for operators to install and disassemble, reduce assembly time and improve production efficiency.

[0049] Secondly, the size and shape of the mounting hole 150 need to be precisely designed to fit the specifications of the fasteners (such as bolts, pins, etc.) used. Reasonable size design not only ensures the firmness of the connection, but also avoids local stress concentration caused by excessive hole diameter. The edges of the mounting hole 150 can be appropriately chamfered or rounded to reduce stress concentration and improve the installation accuracy of the fasteners.

[0050] Furthermore, in order to ensure the structural strength of the mounting portion, a reinforcement structure, such as increasing the wall thickness or providing reinforcing ribs, should be provided around the mounting hole 150. These reinforcement measures can compensate for the local strength loss caused by the opening, ensuring that the mounting portion can still maintain good performance when subjected to high loads.

[0051] Figure 4 The structural schematic diagram of the tube beam body 100 of the tube beam provided in an embodiment of the present invention is illustrated.

[0052] Reference Figure 4In some embodiments of the present invention, the side wall of the tube body 110 is further provided with a drainage hole 160, and the drainage hole 160 is located at the bottom of the tube body 110 in the assembled state. The middle of the cavity 130 is lower than both ends of the cavity 130, and the drainage hole 160 is connected to the middle part of the cavity 130.

[0053] In the above structure, such a setting can ensure that the moisture in the cavity 130 can be effectively drained, thereby improving the overall durability and reliability of the pipe beam. By setting the drainage hole 160 at the bottom, the water accumulated in the low-lying area in the middle of the cavity 130 can be effectively drained by utilizing the effect of gravity, thereby preventing the water from being retained in the cavity 130. This design not only reduces the risk of moisture corrosion to the internal structure of the pipe beam, but also avoids other potential problems caused by moisture accumulation, such as rust, degradation of material properties, etc. The design that the middle of the cavity 130 is lower than the two ends makes any moisture entering the cavity 130 naturally flow to the low-lying area in the middle, and then drain through the drainage hole 160. This self-draining mechanism ensures that the inside of the cavity 130 can remain dry even in a humid or rainy environment, thereby extending the service life of the pipe beam.

[0054] Reference Figure 4 In some embodiments of the present invention, an end cover stopper 122 is provided on the periphery of the port 125, and the end cover stopper 122 is used to stop the pipe beam end cover 200, and a seal is provided between the pipe beam end cover 200 and the end 120. The end 120 is provided with a first sealing ring groove 123, and the pipe beam end cover 200 is provided with a second sealing ring groove 220, and the first sealing ring groove 123 and the second sealing ring groove 220 are arranged correspondingly; when the pipe beam end cover 200 is limited to the end cover stopper 122, the first sealing ring groove 123 and the second sealing ring groove 220 enclose a closed cavity 130, and the seal is located inside the closed cavity 130.

[0055] Figure 5 The schematic structural diagram of the tube beam end cover 200 of the tube beam provided in an embodiment of the present invention is illustrated.

[0056] Reference Figure 3 and Figure 5 In some embodiments of the present invention, a protrusion 124 is provided between the end cover limiting portion 122 and the port 125; a blocking portion 240 is provided in the center of the tube beam end cover 200, and a limiting groove 230 is provided on the outer periphery of the blocking portion 240, and the limiting groove 230 is matched with the protrusion 124; when the tube beam end cover 200 is limited to the end cover limiting portion 122, the protrusion 124 is limited to the limiting groove 230, and the blocking portion 240 is blocked at the port 125.

[0057] In the above structure, an end cap stopper 122 is provided on the periphery of the port 125 of the pipe body 110, and a seal is provided between the end 120 and the pipe beam end cap 200. The main function of this design is to ensure reliable connection and sealing between the pipe beam end cap 200 and the end 120. The end cap stopper 122 is used to stop the pipe beam end cap 200, ensuring that it can be accurately aligned and fixed in the correct position during installation, and preventing displacement or loosening due to vibration or other external forces during use.

[0058] The end 120 is provided with a first sealing ring groove 123, and the pipe beam end cover 200 is provided with a second sealing ring groove 220, and the two sealing ring grooves are arranged correspondingly. When the pipe beam end cover 200 is limited to the end cover limit portion 122, the first sealing ring groove 123 and the second sealing ring groove 220 enclose a closed cavity 130, and the sealing member is located inside the closed cavity 130. This design provides a double sealing effect through the structure of the double-layer sealing ring groove, significantly enhances the sealing performance of the connection part, effectively prevents external pollutants (such as moisture, dust, etc.) from entering the cavity 130, and also avoids the leakage of internal gas or liquid.

[0059] The presence of the seal not only improves the sealing of the connection, but also can absorb and buffer the slight deformation caused by temperature changes or mechanical stress to a certain extent, thereby maintaining a long-term and stable sealing effect.

[0060] The present invention also provides a pipe beam design method, comprising the following steps: S1. Establishing an initial three-dimensional model of the tube beam according to the assembly conditions, bending and torsion conditions of the tube beam; S2. Define the material properties of aluminum alloy, and simulate and analyze the stress of the three-dimensional model of the tube beam based on the material properties of aluminum alloy; S3. Repeat the above steps until the safety factor of the simulation result is greater than the corresponding cast iron part and the maximum displacement does not change significantly.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tubular beam, characterized in that: include: A tube beam body (100) having a cavity (130) inside, the cavity (130) being used for storing gas, and ports (125) being provided at both ends of the tube beam body (100); Tubular beam end covers (200) are arranged in one-to-one correspondence at the ports (125); The material of the tube beam body (100) and the tube beam end cover (200) are both aluminum alloy, and the components of the aluminum alloy include, by weight percentage: Mg: 1.0%-7.0%, Cu: 1.0%-3.0%, Zn: 1.0%-5.0%, Mn: 0.2%-0.7%, Cr: 0.01%-0.03%, Zr: 0.1%-0.5%, Fe<0.15%, other impurity elements are less than 0.02%, and the balance is aluminum.

2. The tubular beam according to claim 1, characterized in that: The tube beam body (100) comprises a tube body (110), the cross section of the tube body (110) is circular, and ends (120) are provided at both ends of the tube body (110), the ends (120) being used for detachably connecting to the tube beam end cap (200).

3. The tubular beam according to claim 2, characterized in that: The side wall of the tube body (110) is provided with an air inlet hole (140) and a mounting hole (150) which are in communication with the cavity (130), and the air inlet hole (140) and the mounting hole (150) are arranged at intervals.

4. The tubular beam according to claim 2, characterized in that: The side wall of the tube body (110) is provided with a plurality of mounting portions, and the mounting portions are provided with mounting holes (150).

5. The tubular beam according to claim 3, characterized in that: The side wall of the tube body (110) is also provided with a drainage hole (160), and the drainage hole (160) is located at the bottom of the tube body (110) in the assembled state.

6. The tubular beam according to claim 5, characterized in that: When the tube body (110) is in an assembled state, the middle of the cavity (130) is lower than both ends of the cavity (130), and the drainage hole (160) is in communication with the middle portion of the cavity (130).

7. The tubular beam according to claim 2, characterized in that: An end cover limiting portion (122) is provided on the outer periphery of the port (125), the end cover limiting portion (122) being used to limit the position of the tube beam end cover (200), and a sealing member is provided between the tube beam end cover (200) and the end portion (120).

8. The tubular beam according to claim 7, characterized in that: The end portion (120) is provided with a first sealing ring groove (123), the tube beam end cover (200) is provided with a second sealing ring groove (220), and the first sealing ring groove (123) and the second sealing ring groove (220) are arranged correspondingly; When the tube beam end cover (200) is limited at the end cover limiting portion (122), the first sealing ring groove (123) and the second sealing ring groove (220) enclose a closed cavity, and the sealing member is located inside the closed cavity.

9. The tubular beam according to claim 7 or 8, characterized in that: A protrusion (124) is provided between the end cover limiting portion (122) and the port (125); A blocking portion (240) is provided in the center of the tube beam end cover (200), a limiting groove (230) is provided on the periphery of the blocking portion (240), and the limiting groove (230) is matched with the protruding portion (124); When the tube beam end cover (200) is limited at the end cover limiting portion (122), the protruding portion (124) is limited at the limiting groove (230), and the blocking portion (240) blocks the port (125).

10. A method for designing a tubular beam, characterized in that: include: Establishing an initial three-dimensional model of the tube beam according to the assembly condition, bending and bending-torsion conditions of the tube beam; Defining the material properties of the aluminum alloy, and performing simulation and stress analysis on the three-dimensional model of the tubular beam according to the material properties of the aluminum alloy; Modify the 3D model and repeat the above steps until the safety factor of the simulation result is greater than the corresponding cast iron part and the maximum displacement does not change significantly.

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