Composite connecting rod

Abstract

The composite connecting rod comprises a metal rod piece and a composite material, and is characterized in that an inner cavity is formed in the composite connecting rod, the composite material comprises an axial composite material and a compression-resistant composite material, the compression-resistant composite material is arranged in the inner cavity, and the axial composite material is wound around the metal rod piece and wound on the outer side of the compression-resistant composite material. Through the composite material, the force bearing performance of the composite connecting rod during load bearing is fully exerted, through the combination of the metal rod piece and the composite material, the weight is saved, a fastener does not need to be used, and the high-performance advantage of the composite material can be fully exerted.

Description

Technical Field

[0001] The present invention relates to the field of aircraft structure or other mechanical technology, and in particular to a composite connecting rod which can maintain certain functionality and safety in the event of partial damage. Background Art

[0002] The application of connecting rods in various mechanical products can be divided into two aspects: one is motion transmission, which is mainly used in system control and motion mechanisms; the other is load transmission, which is mainly used in the main load-bearing parts of the structure and is mainly composed of high-strength metal materials.

[0003] The load-bearing connecting rods currently used in the aviation industry are mainly divided into two categories: the first category is the connecting rods made entirely of metal machining; the second category is the connecting rods composed of composite materials and metal.

[0004] The first type of connecting rods are all made of metal, so they have the disadvantage of being heavy. Therefore, a connecting rod is needed, which can reduce the weight as much as possible while meeting the strength requirements to reduce the total weight of the aircraft.

[0005] The second type of connecting rod mentioned above mainly includes two designs:

[0006] The first type consists of a composite rod and a metal joint to save weight. However, this type of connecting rod usually connects the composite rod and the metal joint together through fasteners, and the fastener connection will pierce the composite rod, which will damage the composite fiber and affect the stress distribution of the composite rod when bearing load, and cannot truly give full play to the high performance advantages of composite materials. There may also be disadvantages such as inconvenient detection, uneven connection quality and low shear resistance. In addition, for this type of connecting rod, if it is used near the aircraft engine, there is also the disadvantage that the fasteners are prone to fatigue damage.

[0007] The second type is composed of a metal rod and a composite material coated on the outside of the metal rod. The design of this connecting rod allows the metal rod to continue to bear the force when the composite material is damaged; conversely, if the metal rod is damaged, the composite material can continue to bear the force, thereby ensuring the safe operation of the entire system. However, the inventors found that the design of this connecting rod has shortcomings, specifically, coating the composite material on the outside of the metal rod cannot fully exert the bearing performance of the composite connecting rod when bearing compressive loads.

[0008] Therefore, there is a need for an improved composite connecting rod that can solve at least one of the above-mentioned deficiencies. Summary of the invention

[0009] In order to solve the problems existing in the above-mentioned prior art, the present invention proposes a composite connecting rod to achieve at least one of the following purposes: one purpose is to fully utilize the load-bearing performance of the composite connecting rod when carrying a load through the compression-resistant composite material; another purpose is to save weight through the combination of metal rods and composite materials; and another purpose is to eliminate the need for fasteners and to fully utilize the high performance advantages of composite materials.

[0010] Therefore, the present invention proposes a composite connecting rod, which includes a metal rod and a composite material, wherein the composite connecting rod is formed with an inner cavity, and the composite material includes an axial composite material and a compressive composite material, wherein the compressive composite material is arranged in the inner cavity, and the axial composite material is wrapped around the metal rod and wrapped around the outside of the compressive composite material.

[0011] According to the above technical scheme, the composite connecting rod of the present invention can achieve the following beneficial effects: through the composite material, the load-bearing performance of the composite connecting rod when bearing loads can be fully utilized, and through the combination of metal rods and composite materials, weight can be saved, and there is no need to use fasteners, and the high performance advantages of the composite material can be fully utilized.

[0012] In an embodiment of the present invention, the composite connecting rod also includes a load-bearing rod arranged in the inner cavity, and an enlarged portion is provided at both ends of the load-bearing rod, the enlarged portion is located outside the inner cavity, and the axial composite material is wrapped around the enlarged portion at both ends, and the axial composite material and the enlarged portion at both ends form an inner cavity.

[0013] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: the load-bearing rod can enhance the load-bearing performance of the composite connecting rod when bearing a load.

[0014] In the embodiment of the present invention, the compression-resistant composite material is coated on the load-bearing rod.

[0015] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: the compression-resistant composite material is combined with the load-bearing rod to enhance the compression resistance of the composite connecting rod, and the compression-resistant composite material plays the role of filling the composite connecting rod and supporting the axial composite material.

[0016] In the embodiment of the present invention, the compression-resistant composite material is spirally wound around the load-bearing rod.

[0017] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: the compression-resistant composite material is combined with the load-bearing rod to enhance the compression resistance of the composite connecting rod, and the compression-resistant composite material plays the role of filling the composite connecting rod and supporting the axial composite material.

[0018] In the embodiment of the present invention, the metal rod comprises two sub-rods and two connecting parts connecting the two sub-rods, and the two sub-rods and the two connecting parts form an inner cavity.

[0019] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: the sub-rods can enhance the load-bearing performance of the composite connecting rod when bearing loads.

[0020] In the embodiment of the present invention, the compression-resistant composite material is a composite laminate.

[0021] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: the compression-resistant composite material is combined with the metal rod to enhance the compression resistance of the composite connecting rod, and the compression-resistant composite material plays the role of filling the composite connecting rod and supporting the axial composite material.

[0022] In an embodiment of the present invention, the metal rod is made of titanium alloy.

[0023] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: ensuring the strength of the composite connecting rod while saving weight.

[0024] In an embodiment of the present invention, the axial composite material is carbon fiber.

[0025] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: ensuring the rigidity of the composite connecting rod.

[0026] In an embodiment of the present invention, the end of the connecting rod is configured with a lug.

[0027] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: it is convenient to connect or install the composite connecting rod with other components.

[0028] In the embodiment of the present invention, the metal rod and the composite material in the composite connecting rod are not connected by fasteners.

[0029] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: no fasteners are required and the high performance advantages of composite materials can be fully utilized.

[0030] It should be understood that the above summary is provided to introduce in a simplified form a selection of concepts that are further described in the detailed description. It is not meant to identify key or essential features of the claimed subject matter, the scope of which is solely defined by the appended claims. Furthermore, the claimed subject matter is not limited to implementations that solve any disadvantages noted above or in any part of this disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Further features and exemplary embodiments and advantages of the present invention are explained in more detail below with reference to the accompanying drawings. It will be appreciated that this embodiment is not exhaustive of the full scope of the present invention. It will be further appreciated that some or all of the features described below may also be combined in other ways, including:

[0032] Figure 1 shows a schematic diagram of assembling a composite connecting rod according to an embodiment of the present invention;

[0033] Figure 2 shows an exploded schematic diagram of a composite connecting rod according to an embodiment of the present invention;

[0034] Figure 3 shows an assembled side view of a composite connecting rod according to an embodiment of the present invention;

[0035] Figure 4a and 4b Schematic diagrams and cross-sectional views showing different configurations of the compression-resistant composite material of the composite connecting rod according to an embodiment of the present invention;

[0036] Figure 5 FIG. 4 is a schematic diagram of a composite connecting rod according to another embodiment of the present invention.

[0037] Reference numerals list

[0038] 1 Composite connecting rod;

[0039] 100 Metal rods;

[0040] 101 sub-bar;

[0041] 102 connection part;

[0042] 103 ear pieces;

[0043] 104 lumen;

[0044] 106 load-bearing rod;

[0045] 107 Enlargement;

[0046] 200 Compression composite material;

[0047] 200' compression composite material;

[0048] 300 Axial Composite. DETAILED DESCRIPTION

[0049] The specific embodiments of the present invention will be described below. It should be noted that in the specific description of these embodiments, in order to be concise and clear, this specification cannot provide a detailed description of all the features of the actual embodiments. It should be understood that in the actual implementation of any embodiment, just as in the process of any engineering project or design project, in order to achieve the specific goals of the developer and to meet system-related or business-related restrictions, various specific decisions are often made, and this will also change from one embodiment to another. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for ordinary technicians in the field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed in this disclosure are just conventional technical means, and should not be understood as insufficient content of this disclosure.

[0050] Unless otherwise defined, the technical terms or scientific terms used in the claims and the specification shall have the usual meanings understood by persons with ordinary skills in the technical field to which the invention belongs. The words "first", "second" and similar words used in the patent application specification and the claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalent elements, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections. In this article, the term "axial direction" refers to a direction parallel to the extension direction of the metal rod of the composite connecting rod. In this article, the terms "inside", "outside", "inward", "outward", "proximal", "distal" and the like are only used to illustrate the relative positions of the elements.

[0051] The composite connecting rod 1 according to the present invention includes a metal rod 100 and a composite material, and the composite connecting rod 1 is formed with an inner cavity 104. The composite material includes an axial composite material 300 for carrying a tensile load and a compressive composite material 200, 200' for carrying a compressive load. The compressive composite materials 200, 200' are arranged in the inner cavity 104 of the composite connecting rod 1, and are combined with the metal rod 100 to enhance the compressive performance of the composite connecting rod 1. The axial composite material 300 is wound around the metal rod 100 and wound on the outside of the compressive composite materials 200, 200', and is combined with the metal rod 100 to enhance the tensile performance of the composite connecting rod 1.

[0052] Figure 1 It is a schematic diagram of the assembly of a composite connecting rod 1 according to an embodiment of the present invention. Figure 2 1 is an exploded schematic diagram of a composite connecting rod 1 according to an embodiment of the present invention. Figure 3 1 is a side view of a composite connecting rod 1 according to an embodiment of the present invention.

[0053] like Figure 1-3 As shown, according to one embodiment of the present invention, the composite connecting rod 1 includes a metal rod 100 and a composite material, wherein the composite material includes a compressive composite material 200 arranged in the composite rod 1 and an axial composite material 300 wound around the metal rod 100 in the axial direction.

[0054] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: no fasteners are used to connect the metal rod and the composite material of the connecting rod, so that the high performance advantage of the composite material is fully utilized.

[0055] Specifically, the composite connecting rod 1 includes an inner cavity 104, the compressive composite material 200 is arranged in the inner cavity 104 of the composite connecting rod 1, and the axial composite material is axially wound around the metal rod 100. Therefore, no fasteners are used to connect the metal rod 100 and the composite material (the compressive composite material 200 and the axial composite material 300) of the connecting rod, so that the high performance advantage of the composite material is fully utilized.

[0056] In addition, when the composite connecting rod 1 is under tension, the direction of tension is consistent with the direction of the composite fiber, which can better exert the high modulus advantage of the composite fiber; when the composite connecting rod is under compression, the direction of pressure is consistent with the direction of the composite fiber, which can better exert the high modulus advantage of the composite fiber, thereby enhancing the compressive resistance of the connecting rod.

[0057] Preferably, if Figure 1-3 As shown, the metal rod 100 penetrates the entire composite connecting rod 1 in the axial direction.

[0058] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: it ensures that the metal rod and the composite material bear the load together, rather than only the composite material, thereby improving the bearing strength of the entire composite connecting rod.

[0059] Preferably, if Figure 1-3 As shown, the composite connecting rod 1 is a connecting rod for an aircraft.

[0060] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: it can be applicable to the field of aviation technology.

[0061] Preferably, if Figure 1-3 As shown, the metal rod 100 includes two sub-rods 101 and two connecting parts 102 connecting the two sub-rods 101 .

[0062] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: through a suitable metal rod form, the compressive composite material can be conveniently and firmly arranged inside the metal rod, and the axial composite material can be conveniently and firmly wrapped axially around the metal rod (i.e., wrapped around the two connecting parts 102).

[0063] Preferably, if Figure 1-3 As shown, the compression-resistant composite material 200 is arranged inside the metal rod 100 of the composite connecting rod 1 . In other words, the inner cavity 104 is preferably included in the metal rod 100 .

[0064] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: the compressive composite material can not only withstand the pressure load, but also play the role of filling the metal rod and supporting the axial composite material.

[0065] Preferably, if Figure 1-3 As shown, the metal rod 100 forms an inner cavity 104 between two sub-rods 101 and between two connecting portions 102 , and the pressure-resistant composite material 200 is disposed in the inner cavity 104 .

[0066] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: it is easy to manufacture the metal rod, reduces the overall weight of the connecting rod, and the compressive composite material plays the role of filling the metal rod and supporting the axial composite material.

[0067] Preferably, if Figure 1-3 As shown, the portion of each sub-bar 101 protruding outward from the corresponding connecting portion 102 forms an ear piece 103 .

[0068] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: the ear piece can facilitate the connection or installation of the composite connecting rod with other components.

[0069] Preferably, if Figure 1-3 As shown, the metal rod 100 and the composite material in the composite connecting rod 1 are connected without fasteners.

[0070] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: no fasteners are used to connect the metal rod and the composite material (axial composite material and compressive composite material) of the connecting rod, so as to give full play to the high performance advantages of the composite material.

[0071] Preferably, if Figure 1-3 As shown, the metal rod 100 is made of a titanium alloy.

[0072] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: the metal rod can be manufactured using suitable metal materials to ensure the strength of the metal rod and the composite connecting rod.

[0073] Of course, the above-mentioned titanium alloy material is only a preferred material form of the metal rod 100 of the composite connecting rod 1 of the present application. Those skilled in the art can understand, based on the disclosure of the present application, that other suitable metal materials (for example, stainless steel, etc.) can also be used without departing from the scope of protection of the claims of the present application.

[0074] Preferably, if Figure 1-3 As shown, the axial composite material 300 is carbon fiber.

[0075] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: suitable composite materials can be used to ensure the rigidity of the composite connecting rod.

[0076] Of course, the above-mentioned carbon fiber material is only a preferred material form of the axial composite material 300 of the composite connecting rod of the present application. Those skilled in the art can understand, based on the disclosure of the present application, that other suitable composite materials (for example, glass fiber, etc.) can also be used without departing from the scope of protection of the claims of the present application.

[0077] Preferably, the compression resistant composite material 200 is a composite laminate.

[0078] Figure 4a and 4b Schematic diagrams and cross-sectional views of different composite material laminate configurations of a compressive composite material 200 of a composite connecting rod 1 according to an embodiment of the present invention are shown. Figure 4a A configuration of a compression composite material 200 is shown, wherein the compression composite material 200 comprises an inner portion consisting of a pure axial fiber laminate and a fiber cloth wrapped around the outer side of the inner portion. Preferably, the pure axial limit laminate is made of carbon fibers.

[0079] Figure 4b Another configuration of the compression composite material 200 is shown, wherein the compression composite material 200 is a conventional composite laminate configuration and does not have a fiber cloth wrapped on the outside. Preferably, the compression composite material is made of carbon fibers.

[0080] Figure 5 A composite connecting rod 1 according to another embodiment of the present invention is shown.

[0081] The composite connecting rod 1 comprises a metal rod 100 and a composite material. The composite connecting rod 1 is formed with an inner cavity 104. The composite material comprises a compression-resistant composite material 200' arranged in the inner cavity 104 and an axial composite material 300 wound around the metal rod 100 in the axial direction.

[0082] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial technical effects: no fasteners are used to connect the metal rod and the composite material of the connecting rod, so that the high performance advantage of the composite material is fully utilized.

[0083] Specifically, the composite connecting rod 1 includes a load-bearing rod 106, and the load-bearing rod 106 is in the inner cavity 104. The compression composite material 200' is arranged in the inner cavity 104 of the composite connecting rod 1 and coated on the load-bearing rod 106, and the axial composite material is axially wound around the metal rod 100, so no fasteners are used to connect the metal rod 100 and the composite material (compression composite material 200' and axial composite material 300) of the connecting rod, giving full play to the high performance advantages of the composite material.

[0084] More specifically, expansion parts 107 are provided at both ends of the load-bearing rod 106 , and the expansion parts 107 are located outside the inner cavity 104 . The axial composite material 300 is wound around the expansion parts 107 at both ends, and the axial composite material 300 and the expansion parts 107 at both ends form the inner cavity 104 .

[0085] Preferably, the load-bearing rod 106 and the enlarged portion 107 are integrally formed, and the load-bearing rod 106 and the enlarged portion 107 constitute the metal rod 100. In other words, the metal rod 100 preferably includes the load-bearing rod 106 and the enlarged portions 107 at both ends.

[0086] Optionally, the load-bearing rod 106 is formed of a composite material, and the load-bearing rod 106 is seated between the two enlarged portions 107. For example, the composite material is a carbon fiber material. In such an optional embodiment, the metal rod 100 of the composite connecting rod 1 includes an enlarged portion 107 made of metal and a load-bearing rod 106 formed of a composite material and seated between the two enlarged portions 107.

[0087] Preferably, the extension direction of the load-bearing rod 106 coincides with the axial direction of the composite connecting rod 1 .

[0088] In another embodiment of the present invention, the compression-resistant composite material 200 ′ is coated on the load-bearing rod 106 .

[0089] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: the compression-resistant composite material is combined with the load-bearing rod to enhance the compression resistance of the composite connecting rod, and the compression-resistant composite material plays the role of filling the composite connecting rod and supporting the axial composite material.

[0090] In another embodiment of the present invention, the compression-resistant composite material 200 ′ is spirally wound around the load-bearing rod 106 .

[0091] According to the above technical solution, the composite connecting rod of the present invention can achieve the following beneficial effects: the compression-resistant composite material is combined with the load-bearing rod to enhance the compression resistance of the composite connecting rod, and the compression-resistant composite material plays the role of filling the composite connecting rod and supporting the axial composite material.

[0092] In another embodiment of the present invention, lugs are configured at both ends of the composite connecting rod 1 for connecting other components. Figure 1-3 In the embodiment shown, the portion of each sub-rod 101 of the metal rod 100 protruding outward from the corresponding connecting portion 102 forms an ear piece 103, and a through hole is provided on the ear piece 103 for connecting with other components, that is, the ear piece 103 plays the role of a lug for connecting with other components. Figure 5 In the illustrated embodiment, the enlarged portion 107 is configured as a lug for connecting with other components, and a through hole is provided on the enlarged portion 107 for connecting with other components.

[0093] The manufacturing and assembly sequence of the composite connecting rod 1 of the present invention may be as follows:

[0094] First, the metal rod 100 and the compression composite materials 200, 200' are assembled together. Specifically, the compression composite material 200 is embedded in the inner cavity 104 of the composite connecting rod 1 or the compression composite material 200' is coated on the load-bearing rod 106; then, the axial composite material 300 is axially wound around the metal rod 100 and wound around the outside of the compression composite materials 200, 200' (that is, the axial composite material 300 is axially wound around the combination of the metal rod 100 and the compression composite material 200).

[0095] The composite connecting rod 1 of the present invention has a damage safety design: when the composite material is damaged, the metal rod 100 can still bear the load; when the metal rod 100 is damaged, the composite material can still bear the load.

[0096] Specifically, in Figure 1-3 In one embodiment of the present invention shown, when a single ear piece 103 is damaged or fails, the load is carried by another ear piece 103. When the connection portion 102 is damaged or fails, there are two cases: longitudinal cracks and transverse cracks. The transverse crack is equivalent to the metal rod 100 being broken at the connection portion 102, and the composite material (axial composite material 300 and compressive composite material 200) can still bear the load. The longitudinal crack is equivalent to the metal rod 100 (two sub-rods 101 at the connection portion 102) being separated, but each part of the separated metal rod 100 (i.e., sub-rod 101) can still bear the load. When the axial composite material 300 or the compressive composite material 200 is damaged or fails, the load is carried by the metal rod 100.

[0097] In such Figure 5 In another embodiment of the present invention, when the load-bearing rod 106 is damaged or fails, the composite material (axial composite material 300 and compressive composite material 200') can still bear the load. When the axial composite material 300 or the compressive composite material 200' is damaged or fails, the load-bearing rod 106 bears the load.

[0098] Through simulation analysis, for the composite connecting rod according to each embodiment of the present invention, the number of layers of tensile fibers (i.e., axial composite materials) and compressive fibers (i.e., compressive composite materials) is set to 20 in ABAQUS; in order to make the simulation results general, the fiber directions are arranged alternately and repeatedly 5 times at 0° / 45° / 90° / -45°; the fiber layer adopts solid units, and a cohesive layer with a thickness of 0.025 mm is inserted between the fiber layers; for the fiber layer, a 3D Hashin damage criterion is used, and it can be found that: under the action of compressive load, the maximum stress position of the composite connecting rod is always on the compressive fiber, and under the same other conditions, the maximum compressive load that the composite connecting rod according to the present invention can withstand is greater than that of the connecting rod in the prior art; under the action of tensile load, the maximum stress position of the composite connecting rod is always on the tensile fiber, and under the same other conditions, the maximum tensile load that the composite connecting rod according to the present invention can withstand is greater than that of the connecting rod in the prior art.

[0099] The optimal geometric characteristics and material properties of the compression composite can also be considered. The flexural strength (i.e., compressive capacity) is usually determined by the flexural stiffness and the maximum flexural stress. If the material mass is constant, that is, it corresponds to a compression fiber hollow cylinder with a constant cross-sectional area, its diameter will affect its flexural strength. For the maximum flexural stress, there is:

[0100]

[0101] Among them, σ max is the maximum bending stress, M is the bending moment, c is the distance from the neutral axis, and I is the moment of inertia of the area.

[0102] For a constant cross section A0, assuming that the ratio of inner diameter to outer diameter is k = D / d, we can obtain:

[0103]

[0104] It can be seen that the magnitude of the moment of inertia I is related to the inner-outer diameter ratio k. Therefore, by selecting a compression-resistant fiber with a suitable inner-outer diameter ratio k, a compression-resistant composite material with an appropriate maximum bending stress can be obtained.

[0105] In this document, the terms "include", "comprises" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, structure or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, structure or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, structure or device that includes the elements.

[0106] The description of the invention is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the invention and to enable those of ordinary skill in the art to understand the invention and thereby design various embodiments with various modifications suitable for particular uses.

Claims

1. A composite connecting rod, comprising a metal rod and a composite material, characterized in that: The composite connecting rod is formed with an inner cavity, and the composite material includes an axial composite material and a compressive composite material, wherein the compressive composite material is arranged in the inner cavity, and the axial composite material is wound around the metal rod and wound on the outside of the compressive composite material.

2. The composite connecting rod according to claim 1, characterized in that: The composite connecting rod includes a load-bearing rod arranged in the inner cavity, with expansion parts provided at both ends of the load-bearing rod, and the expansion parts are located outside the inner cavity. The axial composite material is wrapped around the expansion parts at both ends, and the axial composite material and the expansion parts at both ends form the inner cavity.

3. The composite connecting rod according to claim 2, characterized in that: The compression-resistant composite material is coated on the load-bearing rod.

4. The composite connecting rod according to claim 3, characterized in that: The compression-resistant composite material is spirally wound around the load-bearing rod.

5. The composite connecting rod according to claim 1, characterized in that: The metal rod comprises two sub-rods and two connecting parts connecting the two sub-rods, and the two sub-rods and the two connecting parts surround the inner cavity.

6. The composite connecting rod according to claim 5, characterized in that: The compression-resistant composite material is a composite laminate.

7. The composite connecting rod according to claim 1, characterized in that: The metal rod is made of titanium alloy.

8. The composite connecting rod according to claim 1, characterized in that: The axial composite material is carbon fiber.

9. The composite connecting rod according to claim 1, characterized in that: The end of the composite connecting rod is configured with a lug.

10. The composite connecting rod according to claim 1, characterized in that: The metal rod and the composite material in the composite connecting rod are connected without fasteners.

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