Composite structure, anti-collision beam, anti-collision beam assembly and vehicle

Abstract

The utility model provides a composite structure, an anti-collision beam, an anti-collision beam assembly and a vehicle. And the protective layer is arranged on at least one side surface of the fiber layer. According to the composite structure, the protective layer is arranged on at least one side of the fiber layer, the synergistic reinforcement effect can be achieved, the impact resistance of the composite structure is enhanced, and the composite structure has the advantages of being low in weight, high in specific absorption energy and low in anti-collision peak value. Meanwhile, the protective layer can prevent the fiber layer from being broken and splashed, and the use safety of the composite structure is improved. When the composite structure is applied to a product, light weight of the product can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and more specifically, to a composite structure, an anti-collision beam, an anti-collision beam assembly and a vehicle. Background Art

[0002] In the related art, fiber material is a material with excellent performance, with the advantages of high strength and high modulus, and has excellent performance when subjected to external forces. At the same time, fiber material has low density and light weight, which is very suitable for occasions where weight reduction is required. However, fiber material often shows brittleness when broken, and its impact resistance is relatively weak. In the event of a collision, fiber material is easy to break and splash, making it difficult to apply to structures that need to withstand impact. Utility Model Content

[0003] The first purpose of the utility model is to provide a new technical solution for a composite structure, which can at least solve the problem in the prior art that the fiber material has weak impact resistance and is easily broken and splashed when collided.

[0004] The second object of the utility model is to provide an anti-collision beam, comprising the above-mentioned composite structure.

[0005] The third object of the utility model is to provide an anti-collision beam assembly, including the above-mentioned anti-collision beam.

[0006] The fourth object of the utility model is to provide a vehicle, comprising the above-mentioned anti-collision beam assembly.

[0007] According to a first aspect of the utility model, a composite structure is provided, comprising: a fiber layer; and a protective layer, wherein the protective layer is arranged on at least one side of the fiber layer.

[0008] Optionally, the strength of the fiber layer is 3500Mpa-4500Mpa, and / or the fiber layer is a carbon fiber layer and / or a glass fiber layer.

[0009] Optionally, the carbon fiber layer includes 5 to 9 layers of fiber prepreg.

[0010] Optionally, the fiber prepreg is alternately laid with fiber directions of 0°, 90° and ±45°.

[0011] Optionally, in the multi-layer fiber prepreg, the number of consecutive layers laid at the same angle is ≤4 layers.

[0012] Optionally, the single-layer gram weight of the fiber prepreg is 250g / m 2 ~600g / m 2 , and / or, the single layer thickness of the fiber prepreg is 0.2mm to 0.65mm.

[0013] Optionally, the fiber prepreg includes one or more of unidirectional fabric, warp knitted fabric and plain fabric.

[0014] Optionally, the protective layer is a metal layer.

[0015] Optionally, the material of the metal layer is aluminum alloy.

[0016] Optionally, the fiber layer is crimped to the protective layer.

[0017] Optionally, the fiber layer is crimped to the protective layer.

[0018] Optionally, the protective layers are respectively provided on both sides of the fiber layer.

[0019] According to a second aspect of the utility model, an anti-collision beam is provided, comprising: an inner plate; an outer plate, the outer plate being spaced apart from the inner plate in the thickness direction of the inner plate; and at least one layer of a composite structure described in any one of the above embodiments, the composite structure being connected between the inner plate and the outer plate, and at least a portion of the composite structure extending in the thickness direction of the inner plate.

[0020] Optionally, a cross-section of the composite structure perpendicular to the extension direction of the anti-collision beam is square, arc-shaped, wavy, trapezoidal or broken line-shaped.

[0021] Optionally, the composite structure includes at least one reinforcement unit, each of which includes: a first connection portion, which extends along a first direction and is connected to the outer panel, the first direction being a direction perpendicular to the surface of the anti-collision beam; a second connection portion, which extends along the first direction and is connected to the inner panel, the first connection portion and the second connection portion are spaced apart in the second direction, and the second direction is an extension direction of the anti-collision beam; an extension portion, which extends along the first direction, and both ends of the extension portion are respectively connected to the first connection portion and the second connection portion.

[0022] Optionally, the extension portion includes a first extension portion and a second extension portion, and the first extension portion and the second extension portion extend along the first direction respectively; wherein, one end of the first connecting portion is connected to an end of the first extension portion close to the outer panel, one end of the second connecting portion is connected to an end of the first extension portion close to the inner panel, and the other end of the first connecting portion is connected to an end of the second extension portion close to the outer panel.

[0023] Optionally, there are multiple reinforcing units, and the multiple reinforcing units are arranged along the extension direction of the outer panel.

[0024] Optionally, the number of layers of the composite structure is ≤3.

[0025] Optionally, in a direction from the outer plate toward the inner plate, a distance between the first extending portion and the second extending portion gradually increases.

[0026] Optionally, the composite structure is glued or welded to the inner panel or the outer panel.

[0027] According to a third aspect of the utility model, an anti-collision beam assembly is provided, comprising the anti-collision beam described in any one of the above embodiments.

[0028] According to a fourth aspect of the utility model, a vehicle is provided, comprising the anti-collision beam assembly described in any one of the above embodiments.

[0029] According to the composite structure of the utility model, a protective layer is provided on at least one side of the fiber layer, which can achieve a synergistic strengthening effect, enhance the impact resistance of the composite structure, and have the advantages of low weight, high specific energy absorption and low anti-collision peak. At the same time, the provision of the protective layer can prevent the fiber layer from breaking and splashing, and improve the safety of the composite structure. When the composite structure of this embodiment is applied to a product, it is conducive to achieving lightweight of the product.

[0030] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0032] Figure 1 It is a three-dimensional diagram of an anti-collision beam according to an embodiment of the utility model;

[0033] Figure 2 is a cross-sectional view of an anti-collision beam according to an embodiment of the utility model;

[0034] Figure 3 It is a three-dimensional diagram of a composite structure in an anti-collision beam according to an embodiment of the utility model;

[0035] Figure 4 It is a schematic diagram of a composite structure in an anti-collision beam according to an embodiment of the utility model, which is pressed by a hot pressing process. Figure 1 ;

[0036] Figure 5 It is a schematic diagram of a composite structure in an anti-collision beam according to an embodiment of the utility model, which is pressed by a hot pressing process. Figure 2 ;

[0037] Figure 6It is a schematic diagram of a collision prevention beam assembly and a rigid wall according to an embodiment of the utility model;

[0038] Figure 7 It is a comparison diagram of the specific energy absorption of an anti-collision beam according to an embodiment of the utility model and a traditional anti-collision beam during a head-on collision with a rigid wall at 4 km / h;

[0039] Figure 8 It is a comparison diagram of the cross-sectional forces of the energy absorption boxes corresponding to the anti-collision beam according to an embodiment of the utility model and the traditional anti-collision beam during a head-on collision with a rigid wall at 4 km / h;

[0040] Fig. 9 This is a comparison chart of the intrusion amount of an anti-collision beam according to an embodiment of the utility model and a traditional anti-collision beam during a head-on collision with a rigid wall at 4 km / h.

[0041] Reference numerals

[0042] Anti-collision beam 1; composite structure 100; protective layer 100a; fiber layer 100b; first reinforcement unit A; second reinforcement unit B; first connecting portion 10; second connecting portion 20; first extension portion 30; second extension portion 40; outer panel 101; inner panel 102; female mold 103; male mold 104; offset front-impact energy absorbing block 105; energy absorbing box 106; offset rear-impact energy absorbing block 107; flange 108; mounting bracket 109; rigid wall 110. DETAILED DESCRIPTION

[0043] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0046] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] The anti-collision beam 1 according to an embodiment of the utility model is first described in detail below with reference to the accompanying drawings.

[0049] like Figures 1 to 6 As shown, the composite structure 100 according to the embodiment of the present invention comprises: a fiber layer 100b and a protective layer 100a. Specifically, the protective layer 100a is disposed on at least one side of the fiber layer 100b.

[0050] In other words, the composite structure 100 according to the embodiment of the present invention is mainly composed of a fiber layer 100b and a protective layer 100a. The fiber layer 100b may be a flat layered structure, and the protective layer 100a may be provided on one or both sides of the fiber layer 100b.

[0051] The fiber layer 100b may be made of fiber material, and the fiber material may include but is not limited to glass fiber and carbon fiber. The fiber material has the advantages of high strength and light weight, which can not only improve the strength of the anti-collision beam 1, but also help to achieve lightweight.

[0052] The protective layer 100a and the fiber layer 100b are stacked, and the protective layer 100a can be used to cover the fiber layer 100b, so as to protect the fiber layer 100b and prevent the fiber layer 100b from breaking and splashing. In addition, the material of the protective layer 100a is different from that of the fiber layer 100b, and the stacking of the protective layer 100a and the fiber layer 100b can achieve a synergistic reinforcement effect of different materials, thereby improving the strength and toughness of the composite structure 100.

[0053] It should be noted that the area of ​​the protective layer 100a can be the same as or different from that of the fiber layer 100b, and there is no limitation on this. That is to say, the protective layer 100a can partially cover the fiber layer 100b, completely cover the fiber layer 100b, or exceed the range of the fiber layer 100b. As long as at least a part of the protective layer 100a is stacked with the fiber layer 100b, a synergistic reinforcement effect can be achieved.

[0054] Therefore, according to the composite structure 100 of the embodiment of the utility model, the protective layer 100a is provided on at least one side of the fiber layer 100b, which can achieve the effect of synergistic reinforcement, enhance the impact resistance of the composite structure 100, and have the advantages of low weight, high specific energy absorption and low anti-collision peak. At the same time, the provision of the protective layer 100a can prevent the fiber layer 100b from breaking and splashing, and improve the safety of the composite structure 100. When the composite structure 100 of this embodiment is applied to a product, it is conducive to achieving lightweight of the product.

[0055] In some specific embodiments of the present invention, the strength of the fiber layer 100b is 3500Mpa to 4500Mpa. Within this range, the composite structure 100 can provide sufficient rigidity and energy absorption for the anti-collision beam 1. If the strength of the fiber layer 100b is lower than 3500Mpa, the reinforcing effect of the composite structure 100 will be significantly reduced. If the strength of the fiber layer 100b is higher than 4500Mpa, the cost of the fiber layer 100b is high, which increases the cost of the anti-collision beam 1.

[0056] According to some optional embodiments of the utility model, the fiber layer 100b is a carbon fiber layer 100b or a glass fiber layer 100b. The material of the carbon fiber layer 100b can be a carbon fiber composite material, and the material of the glass fiber layer 100b can be a glass fiber composite material. Both carbon fiber composite materials and glass fiber composite materials have the characteristics of low density, light weight and high strength. In addition, carbon fiber composite materials also have the advantages of heat resistance, corrosion resistance and aging resistance, which is not only conducive to achieving lightweight, but also conducive to improving the strength of the composite structure 100, thereby improving the specific energy absorption of the anti-collision beam 1 and reducing the anti-collision force peak of the anti-collision beam 1.

[0057] Optionally, the carbon fiber composite material may be T700-12K aviation-grade carbon fiber, and the resin may be flame-retardant thermosetting epoxy resin. In some other embodiments, the carbon fiber composite material may also include but is not limited to T300 carbon fiber and T400 carbon fiber.

[0058] According to some other embodiments of the present invention, the carbon fiber layer 100b includes multiple layers of fiber prepreg.

[0059] Specifically, the carbon fiber layer 100 b may be formed by laying out multiple layers of fiber prepreg, and the fiber prepreg may be laid out at various angles to optimize the mechanical properties of the carbon fiber layer 100 b , thereby improving the strength of the anti-collision beam 1 .

[0060] In some specific embodiments of the present invention, the number of fiber prepreg layers is 5 to 9 layers, which can not only make the carbon fiber layer 100 b have excellent mechanical properties to meet anti-collision requirements, but also help control the manufacturing cost of the anti-collision beam 1.

[0061] When the number of fiber prepreg layers is less than 5 layers, the mechanical properties of the carbon fiber layer 100b are poor and it is difficult to meet the anti-collision requirements. When the number of fiber prepreg layers is greater than 9 layers, the thickness of the carbon fiber layer 100b is large, which will increase the thickness of the anti-collision beam 1, thereby increasing the layout space required for the anti-collision beam 1. In addition, the cost of the carbon fiber layer 100b will also be greatly increased.

[0062] Optionally, the fiber prepreg may be a carbon fiber prepreg.

[0063] In some specific embodiments of the present invention, the fiber prepreg is alternately laid with fiber directions of 0°, 90° and ±45°, thereby forming a multi-angle layup, which is beneficial to improving the comprehensive mechanical properties of the carbon fiber layer 100b and improving the strength and rigidity of the anti-collision beam 1. Among them, the 0° layup can be used to bear axial loads, the 90° layup is used to bear lateral loads, and the ±45° layup is used to bear shear loads.

[0064] According to some other embodiments of the present invention, the plying sequence of the fiber prepreg is [0 / 90 / 0 / ±45]s or [90 / 0 / 90 / ±45]s.

[0065] Therefore, the carbon fiber layer 100b includes 8 layers of fiber prepreg laid at multiple angles, and the cooperation between the multiple angle layers is beneficial to optimizing the mechanical properties of the carbon fiber layer 100b, thereby improving the specific energy absorption of the anti-collision beam 1 and reducing the peak anti-collision force.

[0066] According to some optional embodiments of the present invention, in the multi-layer fiber prepreg, the number of consecutive layers laid at the same angle is ≤ 4 layers, so as to prevent the carbon fiber composite material from being delaminated in its own thickness direction.

[0067] According to some optional embodiments of the present invention, the single-layer gram weight of the fiber prepreg is 250g / m 2 ~600g / m 2 Therefore, the carbon fiber layer 100b can maintain excellent mechanical properties and has the advantage of light weight, which is beneficial to improving the strength of the anti-collision beam 1 and achieving lightweight.

[0068] According to some other embodiments of the present invention, the thickness of a single layer of the fiber prepreg is 0.2 mm to 0.65 mm.

[0069] Specifically, since the arrangement space of the anti-collision beam 1 is limited, the thickness of the anti-collision beam 1 in the inner and outer directions is certain. In order to meet the strength requirements, the total thickness of the carbon fiber layer 100b is certain. If the single-layer thickness of the fiber prepreg is less than 0.2 mm, in order to achieve the total thickness, too many layers of fiber prepreg need to be laid, which requires more manual work and makes the processing more complicated. If the thickness of the fiber prepreg is greater than 0.65 mm, when the total thickness is certain, the number of fiber prepreg layers is too small, making it difficult to lay at multiple angles, and thus difficult to meet the mechanical performance requirements.

[0070] In this embodiment, the single-layer thickness of the fiber prepreg is set to 0.2mm~0.65mm, that is, the fiber prepreg can be laid in multiple layers and at multiple angles, which improves the mechanical properties of the carbon fiber layer 100b, and is beneficial to reduce the number of laying layers, simplify the production process of the anti-collision beam 1, and reduce production costs.

[0071] According to some optional embodiments of the present invention, the fiber prepreg includes one or more of unidirectional fabric, warp knitted fabric and plain weave fabric.

[0072] Specifically, unidirectional fabric has the advantages of light weight and low cost, warp knitted fabric has the advantages of good overall performance, high laying efficiency and good paving properties, and plain fabric has the advantage of high stability.

[0073] The fiber prepreg includes one or more of unidirectional fabric, warp knitted fabric and plain weave fabric, and the unidirectional fabric, warp knitted fabric and plain weave fabric can be selected according to their respective advantages and the performance requirements of the anti-collision beam 1.

[0074] In some specific embodiments of the present invention, the protective layer 100a is a metal layer. The metal layer may have good energy absorption characteristics. While protecting the fiber layer 100b, it may also cooperate with the fiber layer 100b to enhance the comprehensive mechanical properties of the anti-collision beam 1.

[0075] Optionally, the material of the metal layer may include but is not limited to steel.

[0076] According to some optional embodiments of the present invention, the material of the metal layer is aluminum alloy, which has the advantages of high energy absorption and light weight.

[0077] Specifically, the reinforcing unit may include a carbon fiber layer 100b and two aluminum alloy layers, and the aluminum alloy may form a skin on the two layers of carbon fiber. A carbon fiber layer and two aluminum alloy layers may form a carbon fiber-aluminum alloy super-mixed structure. The super-mixed structure sandwich may be formed by a dry molding process, which may save cost and time.

[0078] The thickness of the metal layer can be as thin as possible while meeting the requirements of the molding process, so as to meet the requirements of easy manufacturing and large deformation energy absorption.

[0079] According to some optional embodiments of the present invention, protective layers 100a are respectively provided on both sides of the fiber layer 100b, which is beneficial to improving the protection effect of the fiber layer 100b, better preventing the fiber layer 100b from breaking and splashing, and improving the synergistic reinforcement effect of dissimilar materials.

[0080] The anti-collision beam 1 according to the embodiment of the utility model comprises: an inner plate 102 , an outer plate 101 and at least one layer of composite structure 100 .

[0081] Specifically, the outer panel 101 is spaced apart from the inner panel 102 in the thickness direction of the inner panel 102. The composite structure 100 is the composite structure 100 described in any of the above embodiments, and the composite structure 100 is connected between the inner panel 102 and the outer panel 101. At least a portion of the composite structure 100 extends in the thickness direction of the inner panel 102.

[0082] In other words, the anti-collision beam 1 according to the embodiment of the utility model is mainly composed of an inner plate 102, an outer plate 101 and a composite structure 100. Among them, the anti-collision beam 1 can be installed on a vehicle, for example, the anti-collision beam 1 can be installed at the front end or the rear end of the vehicle. In this embodiment, the inner and outer directions of the vehicle can be defined as the inner and outer directions of the anti-collision beam 1. It should be noted that the anti-collision beam 1 can extend along a straight line or a curve, which is not limited here.

[0083] The inner plate 102 and the outer plate 101 may be plate-shaped structures respectively, and one side of the inner plate 102 may be arranged opposite to one side of the outer plate 101. In the thickness direction of the inner plate 102, the inner plate 102 and the outer plate 101 may be spaced apart to form an installation space. The shortest distance between any point on the inner plate 102 and the outer plate 101 may be substantially equal. When the anti-collision beam 1 is installed on a vehicle, the inner plate 102 is closer to the inner side of the vehicle, and the outer plate 101 is closer to the outer side of the vehicle.

[0084] In addition, the inner panel 102 and the outer panel 101 may extend along the extension direction of the anti-collision beam 1 , respectively. When the anti-collision beam 1 extends along a curve, the inner panel 102 and the outer panel 101 may extend along the curve, respectively.

[0085] The number of the composite structure 100 may be one or more layers, which is not limited here. The composite structure 100 may be arranged in the installation space and connected to the inner panel 102 and the outer panel 101 respectively, that is, the composite structure 100 is an interlayer arranged between the inner panel 102 and the outer panel 101. A part or all of the composite structure 100 may extend in the thickness direction of the inner panel 102. When the vehicle collides head-on or offsets, the impact force is along the thickness direction of the inner panel 102, or has a component in the thickness direction of the inner panel 102. Therefore, the part of the composite structure 100 extending in the thickness direction of the inner panel 102 can absorb more impact.

[0086] The composite structure can be processed into the composite structure 100. That is, the composite structure 100 can be mainly composed of a fiber layer 100b and a protective layer 100a, and the fiber layer 100b and the protective layer 100a can be stacked. At least a portion of the fiber layer 100b can extend in the thickness direction of the inner panel 102. Since the fiber layer 100b is stacked with the protective layer 100a, at least a portion of the protective layer 100a can extend in the thickness direction of the inner panel 102.

[0087] When the anti-collision beam 1 is hit by an external force, the external force first acts on the outer panel 101, then is transmitted to the composite structure 100, and then is transmitted to the inner panel 102 and continues to be transmitted to the interior of the vehicle. After the composite structure 100 is subjected to force, the protective layer 100a is deformed and the fiber layer 100b is broken, which can reduce the impact force during the transmission process and improve the performance of the anti-collision beam 1. In addition, since the protective layer 100a and the fiber layer 100b are stacked, the broken fiber layer 100b can be covered by the protective layer 100a to prevent the fiber layer 100b from splashing.

[0088] Therefore, according to the anti-collision beam 1 of the embodiment of the utility model, a composite structure 100 is arranged between the inner panel 102 and the outer panel 101. Since the composite structure 100 is composed of stacked fiber layers 100b and protective layers 100a, it has a synergistic reinforcement effect, which can not only enhance the impact resistance of the anti-collision beam 1 and prevent the fiber layer 100b from splashing, but also help to achieve lightweight. In addition, at least a portion of the composite structure 100 extends in the thickness direction of the inner panel 102, which is beneficial for the composite structure 100 to absorb more impact. Therefore, the anti-collision beam 1 of this embodiment has the advantages of low weight, high specific energy absorption and low anti-collision peak.

[0089] In addition, for new energy vehicles, the battery life is related to the vehicle's own weight. The greater the vehicle's own weight, the lower the cruising range. Therefore, the lightweight anti-collision beam 1 is also beneficial to improving the vehicle's cruising range.

[0090] According to one embodiment of the utility model, the cross-section of the composite structure 100 perpendicular to the extension direction of the anti-collision beam 1 is square, arc-shaped, wavy, trapezoidal or broken line-shaped, so that at least a portion of the composite structure 100 extends along the thickness direction of the inner panel 102, which is beneficial for the composite structure 100 to be more uniformly stressed and better absorb impact.

[0091] Specifically, the cross section may be a cross section obtained by cutting the composite structure 100 along a plane perpendicular to the extension direction of the anti-collision beam 1. The fiber layer 100b and the protective layer 100a may be stacked to form a reinforced plate.

[0092] When the cross section of the composite structure 100 is square, the reinforcing plate can be processed into a square, one of the two opposite sides of the square can be connected to the inner plate 102, and the other can be connected to the outer plate 101. When the cross section of the composite structure 100 is arc-shaped, the reinforcing plate can be processed into an arc, both ends of the arc can be connected to one of the inner plate 102 and the outer plate 101, and the protruding part of the arc can be connected to the other of the inner plate 102 and the outer plate 101. When the cross section of the composite structure 100 is wavy, the reinforcing plate can be bent into a wavy shape, and the turning points of the wavy shape can be connected to the inner plate 102 and the outer plate 101 respectively. When the cross section of the composite structure 100 is trapezoidal, the reinforcing plate can be bent into a trapezoid, one bottom surface of the trapezoid can be connected to the inner plate 102, and the other bottom surface of the trapezoid can be connected to the outer plate 101. When the cross section of the composite structure 100 is in a zigzag shape, the reinforcing plate material may be bent into the zigzag shape, and the tip of the zigzag shape may be connected to the inner plate 102 or the outer plate 101 .

[0093] According to some other embodiments of the present invention, the composite structure 100 includes at least one reinforcement unit, and each reinforcement unit includes: a first connection part 10, a second connection part 20 and an extension part.

[0094] The first connection portion 10 extends along a first direction and is connected to the outer panel 101, and the first direction is the extension direction of the anti-collision beam. The second connection portion 20 extends along the first direction and is connected to the inner panel 102, and the first connection portion 10 and the second connection portion 20 are spaced apart in a second direction, and the second direction is a direction perpendicular to the outer panel 101. The extension portion extends along the first direction, and the two ends of the extension portion are respectively connected to the first connection portion 10 and the second connection portion.

[0095] Specifically, the first connection portion 10, the second connection portion 20 and the extension portion are respectively in the shape of long strips, and the first connection portion 10, the second connection portion 20 and the extension portion have the same extension direction. The first connection portion 10 can be attached to the outer plate 101 and extend along the first direction together with the outer plate 101, and the second connection portion 20 can be attached to the inner plate 102 and extend along the first direction together with the inner plate 102. The second direction is a direction perpendicular to the outer plate 101, that is, the second direction is the thickness direction of the outer plate 101.

[0096] It should be noted that the anti-collision beam can extend in a straight line or in a curve. When the anti-collision beam extends in a curve, the first direction can be the extension direction of the curve. The second direction can be the thickness direction at any position of the outer panel 101.

[0097] When the anti-collision beam 1 is applied to a vehicle, the first direction may be substantially the left-right direction of the vehicle, and the second direction may be substantially the front-rear direction of the vehicle.

[0098] Optionally, the cross section of the composite structure 100 may be in an I-shape, and in this case, the extension portion may be arranged perpendicular to the outer panel 101 .

[0099] In some other optional embodiments, the cross-section of the composite structure 100 may be Z-shaped, and in this case the extension portion may extend obliquely relative to the second direction.

[0100] When the anti-collision beam 1 is hit by an external force, the external force is transmitted from the outer panel 101 to the inner panel 102. When passing through the extension part, a large amount of impact energy can be absorbed by the extension part, thereby reducing the load transmitted to other structures on the vehicle located inside the anti-collision beam 1, for example, reducing the load transmitted to the energy absorption box 106.

[0101] According to some other embodiments of the utility model, the extension portion includes a first extension portion 30 and a second extension portion 40, and the first extension portion 30 and the second extension portion 40 extend respectively along the first direction. Among them, one end of the first connection portion 10 is connected to one end of the first extension portion 30 close to the outer plate 101, one end of the second connection portion 20 is connected to one end of the first extension portion 30 close to the inner plate 102, and the other end of the first connection portion 10 is connected to one end of the second extension portion 40 close to the outer plate 101.

[0102] Specifically, the cross section of the anti-collision beam 1 may be wavy, and the cross section may be a cross section obtained by cutting the anti-collision beam 1 along a first plane, or a cross section obtained by cutting the anti-collision beam 1 along a second plane. The first plane may be perpendicular to the second direction and the third direction, respectively, and the second plane may be perpendicular to the first direction and the second direction, respectively.

[0103] The two ends of the first connection part 10 connected to the first extension part 30 and the second edge hand part 40 may include but are not limited to the two ends of the first connection part 10 in the first direction and the two ends of the first connection part 10 in the third direction, and the third direction is perpendicular to the first direction and the second direction respectively. One end of the second connection part 20 connected to the first extension part 30 may include but is not limited to one end of the second connection part 20 in the first direction and one end of the second connection part 20 in the third direction, which is not limited here.

[0104] For example, when the anti-collision beam 1 is applied to a vehicle, the third direction may be the height direction of the vehicle. In the third direction, the first connecting portion 10 and the second connecting portion 20 have a top end and a bottom end, respectively. In the second direction, the first extending portion 30 and the second extending portion 40 may have a front end and a rear end, respectively.

[0105] like Figure 2As shown, the bottom end of the first connection part 10 is connected to the front end of the first extension part 30, the top end of the second connection part 20 is connected to the rear end of the first extension part 30, and the top end of the first connection part 10 is connected to the front end of the second extension part 40. The bottom end of the first connection part 10 is connected to the front end of the first extension part 30, the top end of the second connection part 20 is connected to the rear end of the first extension part 30, and the top end of the first connection part 10 is connected to the front end of the second extension part 40.

[0106] When the anti-collision beam 1 is hit by an external force, the external force is transmitted from the outer panel 101 to the inner panel 102. When passing through the first extension part 30 and the second extension part 40, the impact energy can be largely absorbed by the first extension part 30 and the second extension part 40. The fiber layers in the first extension part 30 and the second extension part 40 can be broken and absorb energy, thereby reducing the load transmitted to other structures on the vehicle located on the inner side of the anti-collision beam 1, for example, reducing the load transmitted to the energy absorption box 106.

[0107] In some specific embodiments of the present invention, there are multiple reinforcing units, and the multiple reinforcing units are arranged along the extension direction of the outer plate 101.

[0108] Specifically, providing a plurality of reinforcing units is beneficial to improving the ability of the composite structure to absorb impact.

[0109] It should be noted that the extension direction of the outer panel 101 may refer to a direction parallel to the outer panel 101. When the outer panel 101 is arc-shaped, the extension direction of the outer panel 101 may be a direction parallel to any small part of the outer panel 101. For example, the extension direction of the outer panel 101 includes but is not limited to the first direction, the third direction, and the direction of the line connecting two opposite vertex angles of the outer panel 101.

[0110] Arranging the plurality of reinforcing units along the extension direction of the outer panel may include: arranging the plurality of reinforcing units along the first direction, and / or arranging the plurality of reinforcing units along the third direction.

[0111] In some other embodiments, the plurality of reinforcing units may also be arranged along a line connecting two vertices of the outer panel 101 .

[0112] Optionally, two adjacent reinforcing units are a first reinforcing unit A and a second reinforcing unit B, the first reinforcing unit A is lower than the second reinforcing unit B, and the rear end of the second extension portion 40 in the first reinforcing unit A is connected to the bottom end of the second connecting portion 10 in the second reinforcing unit B. The reinforcing units that can be connected in sequence can form a wavy composite structure 100. By increasing the number of reinforcing units, the impact can be dispersed and transmitted by multiple reinforcing units, which is conducive to absorbing more impact energy.

[0113] According to some other embodiments of the utility model, the number of reinforcing units is ≤3. When the number of reinforcing units is greater than 3, the anti-collision beam 1 can be strengthened, but the weight of the composite structure 100 will increase significantly, which is not conducive to the lightweight of the vehicle. In addition, too many reinforcing units will also increase the thickness of the composite structure 100 in the inner and outer directions, occupying more space for the layout of the whole vehicle. Therefore, setting the number of reinforcing units to ≤3 can not only strengthen the anti-collision beam 1, but also help to achieve lightweight, and at the same time the anti-collision beam 1 occupies a small space.

[0114] In some specific embodiments of the present invention, in the direction from the outer plate 101 to the inner plate 102 , the distance between the first extending portion 30 and the second extending portion 40 gradually increases.

[0115] like Figure 2 As shown, the two ends of the first connection portion 10 can be connected to the first extension portion 30 and the second extension portion 40 respectively, and the first extension portion 30 and the second extension portion 40 extend from the first connection portion 10 toward the second connection portion 20 respectively, and the distance between the first extension portion 30 and the second extension portion 40 gradually increases. The second extension portion 40 can be tilted upward relative to the horizontal plane, and the first extension portion 30 can be tilted downward relative to the horizontal plane, thereby, the impact energy can be extended toward the upper and lower sides of the anti-collision beam 1, on the one hand, the load transmitted to other structures on the inner side of the anti-collision beam 1 on the vehicle can be reduced, and on the other hand, the opposite up and down transmission paths can offset part of the load and absorb more impact energy.

[0116] According to some other embodiments of the present invention, the composite structure 100 is bonded or welded to the inner plate 102 or the outer plate 101. The composite structure 100 and the inner plate 102 or the outer plate 101 can be bonded or welded, and both can meet the strength requirements.

[0117] For example, the first connection portion 10 of the composite structure 100 may be glued or welded to the outer panel 101 , and the second connection portion 20 of the composite structure 100 may be glued or welded to the inner panel 102 .

[0118] In some specific embodiments of the present invention, the fiber layer 100b is crimped to the protective layer 100a.

[0119] Specifically, the protective layer 100a is prefabricated, and then the fiber layer 100b is laid on the protective layer 100a, and then the fiber layer 100b and the protective layer 100a are pressed together to form a super-mixed structure.

[0120] Figure 4 and Figure 5 The male mold 104 and the female mold 103 in the dry molding process are shown. The specific manufacturing process of the anti-collision beam 1 of this embodiment is described in detail below.

[0121] Step S1, analyzing the number of plies and the ply angle of the fiber prepreg. Using optimization analysis, the number of plies and the ply angle of the fiber prepreg required for the maximum energy absorption of the anti-collision beam 1 are obtained, and the fiber prepreg is cut according to the result.

[0122] Step S2, scrubbing and applying mold release wax: Scrub the male mold 104, the female mold 103 and the aluminum alloy material used to prepare the protective layer 100a with a dry towel, and then evenly apply mold release wax on the inner surface of the male mold 104 and the female mold 103.

[0123] Step S3, hot pressing the two protective layers 100a. The installed male mold 104 and female mold 103 are hot pressed on a hot press machine at a pressure of 5 MPa and a temperature of 150°C. After keeping the temperature for 10 minutes, the two protective layers 100a are automatically cooled to room temperature to obtain the two protective layers 100a.

[0124] Step S4, laying fiber prepreg. The previously cut fiber prepreg is laid on the prepared protective layer 100a. Here, a two-dimensional twill woven composite material can be used to lay it at [0(90) / 0(90) / 0(90) / ±45]s. Then, another prepared protective layer 100a is covered on the prepreg, and the mold is closed again.

[0125] Step S5, hot pressing the composite structure 100. The fiber layer 100b and the two protective layers 100a are hot pressed twice in the hot press at a pressure of 5 MPa and a temperature of 150°C. After 120 minutes of heat preservation, the composite structure 100 is automatically cooled to room temperature.

[0126] Step S6, using aluminum extrusion process to prepare the inner plate 102 and the outer plate 101, polishing the inner plate 102, the outer plate 101 and the contact parts of the composite structure 100 for connecting the inner plate 102 and the outer plate 101 with sandpaper, cleaning them with acetone solution and then applying glue, placing them in an insulation box for curing for 30 minutes, and obtaining the anti-collision beam 1.

[0127] Among them, [0(90) / 0(90) / 0(90) / ±45]s means paving at [0 / 90 / 0 / ±45]s or [90 / 0 / 90 / ±45]s.

[0128] The embodiment of the utility model further provides an anti-collision beam, which includes the anti-collision beam 1 according to any of the above embodiments. Since the anti-collision beam 1 according to the embodiment of the utility model has the above technical effects, the anti-collision beam according to the embodiment of the utility model also has corresponding technical effects, that is, it can not only strengthen the strength of the anti-collision beam 1 and prevent the fiber layer 100b from splashing, but also help to achieve lightweight. In addition, at least a part of the composite structure 100 extends in the thickness direction of the inner plate 102, which is beneficial for the composite structure 100 to absorb more impact. Therefore, the anti-collision beam 1 of this embodiment has the advantages of low weight, high specific energy absorption and low anti-collision peak.

[0129] In some specific embodiments, the anti-collision beam may further include two offset front energy absorbing blocks 105, two energy absorbing boxes 106, two offset rear energy absorbing blocks 107, two flanges 108 and two mounting brackets 109. The two offset front energy absorbing blocks 105 are spaced apart in the left-right direction of the vehicle.

[0130] During a collision, the impact force may be transmitted from the anti-collision beam 1 to the offset front energy absorbing block 105 , the energy absorbing box 106 , the offset rear energy absorbing block 107 , the flange 108 and the mounting bracket 109 in sequence.

[0131] The embodiment of the utility model also provides a vehicle, which includes an anti-collision beam according to any of the above embodiments. Since the anti-collision beam according to the embodiment of the utility model has the above technical effects, the vehicle according to the embodiment of the utility model also has the corresponding technical effects, that is, it can not only strengthen the strength of the anti-collision beam 1 and prevent the fiber layer 100b from splashing, but also help to achieve lightweight. In addition, at least a part of the composite structure 100 extends in the thickness direction of the inner plate 102, which is beneficial for the composite structure 100 to absorb more impact. Therefore, the anti-collision beam 1 of this embodiment has the advantages of low weight, high specific energy absorption and low anti-collision peak.

[0132] The following simulation is conducted on the anti-collision beam 1 of this embodiment and the traditional "eye-shaped" aluminum alloy anti-collision beam. The two anti-collision beams 1 have the same size. The rigid wall 110 is designed to hit the anti-collision beam 1 head-on at 4 km / h. The offset front energy absorption block 105, energy absorption box 106 and offset rear energy absorption block 107 behind the anti-collision beam 1 are all made of aluminum alloy, and the flange 108 is made of steel. The maximum energy absorption box 106 cross-sectional force, maximum energy absorption, maximum intrusion amount and weight of the two are compared. Among them, the anti-collision beam 1 of this embodiment is prepared using the above-mentioned anti-collision beam 1 manufacturing process, and the comparison results are shown in FIG. Figures 7 to 9 And Table 1 below.

[0133] Table 1 Performance comparison between the anti-collision beam of this embodiment and the traditional anti-collision beam

[0134]

[0135] Compared with the traditional aluminum alloy anti-collision beam, the maximum specific energy absorption of the anti-collision beam 1 of this embodiment is increased by 13.3%, the maximum cross-sectional force of the energy absorption box 106 is decreased by 26.6%, the maximum intrusion amount is increased by 0.44% and the mass is reduced by 19.1%. It can be seen that the anti-collision beam 1 of this embodiment has the advantages of high specific energy absorption and low anti-collision force peak value as well as lightweight value.

[0136] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A composite structure, characterized in that: include: Fiber layer; A protective layer, the protective layer being disposed on at least one side of the fiber layer; The protective layer is a metal layer; The fiber layer includes 5 to 9 layers of fiber prepreg.

2. The composite structure according to claim 1, characterized in that The strength of the fiber layer is 3500Mpa-4500Mpa, and / or the fiber layer is a carbon fiber layer and / or a glass fiber layer.

3. The composite structure according to claim 1, characterized in that: The fiber prepreg is laid alternately with fiber directions of 0°, 90° and ±45°.

4. The composite structure according to claim 1, characterized in that In the multi-layer fiber prepreg, the number of consecutive layers laid at the same angle is ≤4.

5. The composite structure according to claim 1, characterized in that: The single-layer weight of the fiber prepreg is 250g / m 2 ~600g / m 2 , and / or, the single layer thickness of the fiber prepreg is 0.2mm to 0.65mm.

6. The composite structure according to claim 1, characterized in that The fiber prepreg includes one or more of unidirectional fabric, warp knitted fabric and plain fabric.

7. The composite structure according to claim 1, characterized in that The material of the metal layer is aluminum alloy.

8. The composite structure according to any one of claims 1 to 6, characterized in that: The fiber layer is crimped and connected to the protective layer.

9. The composite structure according to any one of claims 1 to 6, characterized in that: The protective layers are respectively arranged on both sides of the fiber layer.

10. An anti-collision beam, characterized in that: include: Inner panels; an outer plate, the outer plate being spaced apart from the inner plate in a thickness direction of the inner plate; At least one layer of the composite structure according to any one of claims 1 to 9, the composite structure being connected between the inner panel and the outer panel, and at least a portion of the composite structure extending in the thickness direction of the inner panel.

11. The anti-collision beam according to claim 10, characterized in that: The cross section of the composite structure perpendicular to the extension direction of the anti-collision beam is square, arc-shaped, wavy, trapezoidal or broken line-shaped.

12. The anti-collision beam according to claim 10, characterized in that: The composite structure comprises at least one reinforcement unit, each of the reinforcement units comprising: A first connecting portion, the first connecting portion extending along a first direction and connected to the outer panel, the first direction being an extending direction of the anti-collision beam; a second connecting portion, the second connecting portion extending along the first direction and connected to the inner plate, the first connecting portion and the second connecting portion being spaced apart in a second direction, the second direction being a direction perpendicular to the outer plate; An extension portion extends along a first direction, and two ends of the extension portion are respectively connected to the first connection portion and the second connection portion.

13. The anti-collision beam according to claim 12, characterized in that: The extending portion includes a first extending portion and a second extending portion, wherein the first extending portion and the second extending portion extend along a first direction respectively; Among them, one end of the first connecting part is connected to one end of the first extending part close to the outer plate, one end of the second connecting part is connected to one end of the first extending part close to the inner plate, and the other end of the first connecting part is connected to one end of the second extending part close to the outer plate.

14. The anti-collision beam according to claim 12, characterized in that: There are multiple reinforcing units, and the multiple reinforcing units are arranged along the extension direction of the outer plate.

15. The anti-collision beam according to claim 10, characterized in that: The number of layers of the composite structure is ≤3.

16. The anti-collision beam according to claim 13, characterized in that: In a direction from the outer plate to the inner plate, a distance between the first extending portion and the second extending portion gradually increases.

17. The anti-collision beam according to claim 10, characterized in that: The composite structure is glued or welded to the inner plate or the outer plate.

18. An anti-collision beam assembly, characterized in that: include: The anti-collision beam according to any one of claims 10 to 17.

19. A vehicle, characterized in that: include: The anti-collision beam assembly described in claim 18.

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