Composite material vehicle doorsill stiffening beam and vehicle doorsill

Abstract

The utility model discloses a composite material vehicle threshold stiffening beam, the composite material vehicle threshold stiffening beam comprises a skeleton structure and a polystyrene foam bonding structure, the skeleton structure comprises an outer skeleton and an inner skeleton, the outer skeleton is provided with a cavity, the inner skeleton is arranged in the cavity of the outer skeleton, and the polystyrene foam bonding structure is arranged in the cavity of the outer skeleton. A plurality of cavities which are through and parallel in the length direction are formed in the cavity; the polystyrene foam bonding structure comprises polystyrene foam, and the polystyrene foam is arranged on the periphery of the outer framework and used for heating, foaming and filling gaps between the stiffening beam and the inner and outer doorsills and connecting the stiffening beam and the inner and outer doorsills. According to the composite material vehicle doorsill stiffening beam and the vehicle doorsill, the framework structure serves as a basic supporting frame, the collapsing energy absorption level of the framework is improved through a multi-cavity structure, and gaps between the stiffening beam and the inner doorsill and gaps between the stiffening beam and the outer doorsill are filled and connected through a polystyrene foam bonding structure and polystyrene foam thermal expansion. And good sealing performance, heat insulation performance, sound insulation performance, shock absorption performance, energy absorption performance and the like are provided.

Description

Technical Field

[0001] This utility model relates to the field of vehicle door sill technology, specifically to a composite material vehicle door sill reinforcement beam and vehicle door sill. Background Technology

[0002] In the manufacturing of passenger vehicle parts, traditional door sill reinforcement beams mostly use metal (steel, aluminum alloy) reinforcement beams, which have sufficient structural strength but are heavy. Currently, composite material door sill beams can reduce weight. For example, Chinese Patent 201910533970.0 discloses a carbon fiber composite door sill beam, including a door sill beam body, a foam core, and an outer shell. The door sill beam body is composed of an outer shell and a foam core disposed inside the outer shell. The outer shell is made of carbon fiber composite material and has a rectangular hollow structure. The foam core has a first metal connecting reinforcement and a third metal connecting reinforcement at both ends along its length.

[0003] The existing technology has the following problems: the sill beam is hollow inside. Although it is filled with foam core, it still requires metal connecting reinforcements at both ends to strengthen the structural strength. This not only increases the weight of the sill, but also the connection point between the metal reinforcement and the composite material is prone to become a stress concentration area. Especially when subjected to dynamic loads or impacts, this stress concentration may lead to local failure and affect the strength and reliability of the overall structure. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a composite material door sill reinforcement beam and door sill, thereby solving the technical problem that the increase in structural strength of composite material door sill beams through metal reinforcement affects the overall structural strength and reliability.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] Firstly, this utility model provides a composite material door sill reinforcement beam, comprising:

[0007] A skeletal structure comprising an outer skeleton and an inner skeleton, wherein the outer skeleton has a cavity, and the inner skeleton is disposed within the cavity of the outer skeleton, forming a plurality of parallel and continuous chambers along its length within the cavity; and

[0008] A foam adhesive bonding structure includes a foam adhesive disposed on the outer periphery of the outer frame, used for heating and foaming to fill and connect the gaps between the reinforcing beam and the inner and outer thresholds.

[0009] In some embodiments, a filler is also included, the filler being inserted into at least one of the chambers.

[0010] In some embodiments, the filler is one or more of polyurethane, phenolic foam board, wood powder resin core material, and PVC foam board.

[0011] In some embodiments, the expanding foam is at least wrapped around the opposite two sides of the exoskeleton.

[0012] In some embodiments, a protrusion is also connected to the outer peripheral surface of the exoskeleton, and the protrusion is embedded in the expanding foam.

[0013] In some embodiments, the protrusion includes one or more of a tapered protrusion, a trapezoidal protrusion, a circular protrusion, or a hemispherical protrusion, and the height of the protrusion is between 0.5 mm and 2 mm.

[0014] In some embodiments, the inner frame includes support beams, and a plurality of the support beams are integrally formed on the inner side of the outer frame.

[0015] In some embodiments, the skeleton structure has multiple chambers along the cross section that divide the inner skeleton and the outer skeleton to form multiple sub-region skeletons with at least one chamber each. Adjacent sub-region skeletons are provided with a concave-convex inlay structure, and an adhesive layer is also provided between adjacent sub-region skeletons to connect adjacent sub-region skeletons.

[0016] In some embodiments, the skeleton structure is a glass fiber reinforced epoxy, polyurethane, or unsaturated resin composite frame or a glass fiber reinforced nylon frame.

[0017] Secondly, this utility model also provides a car door sill, including the composite material car door sill reinforcement beam described in any one of the above, and also including an outer door sill and an inner door sill, wherein the outer door sill and the inner door sill together form a hollow cavity, and the composite material car door sill reinforcement beam is arranged in the hollow cavity and connected to the outer door sill and the inner door sill through the foam adhesive bonding structure.

[0018] Compared with the prior art, the composite material door sill reinforcement beam and door sill provided by this utility model use a skeleton structure as the basic support frame, improve the energy absorption level of the skeleton collapse with a multi-chamber structure, and use a foam adhesive bonding structure, as well as the thermal expansion of the foam adhesive to fill and connect the gap between the reinforcement beam and the inner and outer door sills, which is lightweight and provides good sealing, heat insulation, sound insulation, shock absorption and energy absorption properties. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the composite material door sill reinforcement beam provided in this embodiment of the utility model;

[0020] Figure 2 This is a front view of the composite material door sill reinforcement beam provided in this embodiment of the utility model;

[0021] Figure 3 This is a structural schematic diagram of the composite material door sill reinforcement beam and protrusion provided in this embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the car door sill provided in an embodiment of this utility model;

[0023] Figure 5 This is a schematic diagram of the sub-region skeleton structure of the skeleton structure provided in this embodiment of the utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Skeleton structure; 11. Exterior skeleton; 12. Interior skeleton; 121. Support beam; 101. Chamber; 102. Sub-region skeleton;

[0026] 2. Foam adhesive bonding structure; 21. Foam adhesive; 22. Protruding parts;

[0027] 3. Filler; 4. Outer sill; 5. Inner sill; 6. Hollow cavity. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] To address the technical problem that increasing the structural strength of composite door sill beams with metal reinforcements affects the overall structural strength and reliability, this utility model provides a composite door sill reinforcement beam. This beam uses composite material as the main body, enhances structural strength through a multi-chamber structure, and connects to the inner and outer door sills with lightweight and high-strength foam.

[0030] It should be noted that the composite material door sill reinforcement beam described in this utility model is used for, but not limited to, door sills. For ease of explanation, this utility model only uses the application of the composite material door sill reinforcement beam to door sills as an example. The principle of applying the composite material door sill reinforcement beam to other types of equipment is essentially the same as that applied to door sills, and will not be elaborated here.

[0031] Please see Figure 1-3, the present utility model provides a composite material vehicle sill reinforcement beam. The composite material vehicle sill reinforcement beam includes a skeleton structure 1 and a foaming adhesive bonding structure 2. The skeleton structure 1 includes an outer skeleton 11 and an inner skeleton 12. The outer skeleton 11 has a cavity. The inner skeleton 12 is integrally formed inside the outer skeleton 11 and forms a plurality of chambers 101 that penetrate and are parallel in the length direction within the cavity; the foaming adhesive bonding structure 2 includes a foaming adhesive 21. The foaming adhesive 21 is pasted or otherwise covered on the outer periphery of the outer skeleton 11 and is used to heat and foam to fill the gap between the reinforcement beam and the inner and outer sills and connect. The foaming adhesive foams at 150 - 200 °C for 20 - 30 minutes to connect the inner and outer sills and form a closed cavity.

[0032] Further, the inner skeleton 12 includes support beams 121. A plurality of the support beams 121 are integrally formed inside the outer skeleton 11, that is, the outer skeleton 11 and the inner skeleton 12 are integrated and made of the same material.

[0033] Further, the cross-sectional shape of the skeleton structure 1 is in the shape of a Chinese character 'Ri', 'Mu', 'Gong' or hexagonal honeycomb, and can be various forms of cross-sections and chamber distributions.

[0034] Among them, the skeleton structure 1 is a glass fiber reinforced epoxy composite material frame or a glass fiber reinforced nylon frame. Correspondingly, for the multi-chamber structure formed by the outer skeleton 11 and the inner skeleton 12, the pultrusion molding method or extrusion process can be adopted; the production material of the glass fiber reinforced epoxy composite material frame is glass fiber reinforced epoxy composite material, in which the continuous glass fiber content is 65 - 75%, and pultrusion molding is adopted; the production material of the glass fiber reinforced nylon frame is glass fiber reinforced nylon, in which the long glass fiber content is 35% - 55%, and extrusion molding is adopted.

[0035] It can be understood that the traditional composite material sill beam generally adopts the two-color injection molding process, with high mold costs and high product costs. However, adopting the pultrusion plus gluing process can not only meet the performance requirements, but also has the advantages of low mold costs and low product costs.

[0036] It should be noted that the glass fiber reinforced epoxy composite material frame or the glass fiber reinforced nylon frame has a lower cost compared to the carbon fiber sill beam. Under the condition of forming a multi-chamber structure, while maintaining sufficient strength, the purpose of reducing costs is achieved.

[0037] In one of the embodiments, please refer to Figure 1 and Figure 2 , in order to improve the comprehensive performance of the reinforcement beam, the composite material vehicle sill reinforcement beam further includes a filler 3. The filler (3) is at least inserted into one of the chambers 101, that is, according to the number of chambers 101, the filler 3 can be one or multiple, and the maximum number is the same as the number of chambers.

[0038] Specifically, the filler 3 is one or more of polyurethane, phenolic foam board, wood powder resin core material, and PVC foam board. Polyurethane has high thermal insulation performance, as well as high compressive and tensile strength, and can withstand large loads. It is suitable for structural support and buffer protection. As a filler in the cavity, it can improve the thermal insulation performance and strength of the thermal threshold. Phenolic foam board has excellent fire resistance and excellent thermal insulation effect. Wood powder resin core material has low density and high strength, which can provide good support performance while reducing weight. It is suitable for lightweight design and also has certain sound insulation and shock absorption effects. PVC foam board also has low density and high strength, which can provide good support performance while reducing weight. It is suitable for lightweight design and has excellent waterproof and moisture-proof performance. Polyurethane, phenolic foam board, wood powder resin core material, and PVC foam board can be used in combination for multi-cavity filling according to their advantages to improve the overall performance of the reinforced beam.

[0039] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The foam 21 is strip-shaped and at least wraps around the opposite two sides of the outer frame 11. The two sides are connected to the outer threshold 4 and the inner threshold 5 respectively. Furthermore, under foaming conditions, it can form a large-scale wrapping around the outer frame 11, resulting in high structural strength and sealing performance.

[0040] Furthermore, to enhance the structural bond strength with the expanding foam, protrusions 22 are attached to the outer peripheral surface of the inner skeleton 12. These protrusions are embedded within the expanding foam 21, and the surface protrusions provide additional mechanical interlocking force, allowing the expanding foam to more firmly grasp these protrusions after curing. This mechanical interlocking effect significantly improves the shear and peel strength of the adhesive interface. The protrusions increase the effective contact area of ​​the material surface, thus providing more space for the expanding foam to adhere. A larger contact area means stronger adhesion.

[0041] Specifically, the protrusion 22 includes one or more of a conical protrusion, a trapezoidal protrusion, a circular protrusion, or a hemispherical protrusion, and the height of the protrusion 22 is between 0.5 mm and 2 mm.

[0042] In one embodiment, please refer to Figure 5, on the skeleton structure 1, multiple chambers 101 along the cross-section divide the inner skeleton 12 and the outer skeleton 11, forming multiple sub-region skeletons 102 each having at least one chamber 101. An uneven mosaic structure is provided between adjacent sub-region skeletons. That is, a convex block is provided on one side of the sub-region skeleton 102, and a groove is provided on the other side of the sub-region skeleton 102. The convex block and the groove are inserted and connected to form positioning. Moreover, an adhesive layer is also provided between adjacent sub-region skeletons, and the adjacent sub-region skeletons 102 are connected through the adhesive layer to form a stable connection.

[0043] It can be understood that for the current multi-chamber cross-section forms manufactured by the pultrusion process, such as the "day" shape and the "eye" shape, the ability of the threshold reinforcing beam to resist bending force and impact force is relatively poor. In order to improve the resistance of these two structures, it is necessary to increase the number of chambers in the cross-section. However, when the number of chambers increases, the cross-section form becomes complex, making it difficult to produce by the pultrusion process. To solve the problem of forming the reinforcing beam with a complex cross-section form, the cross-section is divided into multiple sub-region cross-sections that can be pultruded. An uneven mosaic structure is added between each cross-section, and the partition interfaces are adhesively connected into one body, so as to achieve the purpose of facilitating the manufacture by the pultrusion process.

[0044] The present utility model also provides a vehicle threshold, please refer to Figure 4 , including the composite material vehicle threshold reinforcing beam according to any one of the above embodiments, further including an outer threshold 4 and an inner threshold 5. A hollow cavity 6 is formed by enclosing between the outer threshold 4 and the inner threshold 5. The composite material vehicle threshold reinforcing beam is arranged in the hollow cavity 6 and is adhesively connected to the outer threshold 4 and the inner threshold 5 through the foaming adhesive bonding structure 2.

[0045] For a better understanding of the present utility model, the following combines Figures 1 to 4 to elaborate on the technical solution of the present utility model in detail: The skeleton structure 1 can be an equal cross-section of various forms, such as the "day" shape, the "eye" shape, the "I" shape, the hexagonal honeycomb, etc. Under the structural strength of the basic outer skeleton 1, the inner skeleton 12 forms multiple chambers to provide support for the internal cavity, enhancing the overall strength; the skeleton structure 1 can adopt the pultrusion molding method or the extrusion process, and the material can be pultruded from glass fiber reinforced epoxy or polyurethane or unsaturated resin composite materials, or extruded from glass fiber reinforced nylon, achieving the purpose of integrally forming the outer skeleton 11 and the inner skeleton 12; the epoxy foaming adhesive 21 is pasted locally or entirely on the outer periphery of the outer skeleton 11 in the form of a rubber strip, and the foaming adhesive 21 is heated at 150 - 200 °C for 20 - 30 minutes to foam, connecting the inner and outer thresholds to form a closed cavity; inside the chamber 101, polyurethane, phenolic foam board or wood powder resin core material, PVC foam board, etc. can be filled to enhance the structural strength and comprehensive performance.

[0046] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A composite material door sill reinforcement beam, characterized in that, include: A skeletal structure comprising an outer skeleton and an inner skeleton, wherein the outer skeleton has a cavity, and the inner skeleton is disposed within the cavity of the outer skeleton, forming a plurality of parallel and continuous chambers along its length within the cavity; and A foam adhesive bonding structure includes a foam adhesive disposed on the outer periphery of the outer frame, used for heating and foaming to fill and connect the gaps between the reinforcing beam and the inner and outer thresholds.

2. The composite material door sill reinforcement beam according to claim 1, characterized in that, It also includes a filler, which is inserted into at least one of the chambers.

3. The composite material door sill reinforcement beam according to claim 2, characterized in that, The filler is one or more of polyurethane, phenolic foam board, wood powder resin core material, and PVC foam board.

4. The composite material door sill reinforcement beam according to claim 3, characterized in that, The expanding foam is wrapped around at least two opposite sides of the outer frame.

5. The composite material door sill reinforcement beam according to claim 4, characterized in that, The outer periphery of the exoskeleton is also connected to a protrusion, and the protrusion is embedded in the foam.

6. The composite material door sill reinforcement beam according to claim 5, characterized in that, The protrusion includes one or more of a conical protrusion, a trapezoidal protrusion, a circular protrusion, or a hemispherical protrusion, and the height of the protrusion is between 0.5 mm and 2 mm.

7. The composite material door sill reinforcement beam according to claim 6, characterized in that, The inner frame includes support beams, and multiple support beams are integrally formed on the inner side of the outer frame.

8. The composite material door sill reinforcement beam according to claim 1, characterized in that, The skeleton structure has multiple chambers along its cross-section that divide the inner skeleton and the outer skeleton, forming multiple sub-region skeletons with at least one chamber each. Adjacent sub-region skeletons are provided with a concave-convex inlay structure, and an adhesive layer is also provided between adjacent sub-region skeletons to connect them.

9. The composite material vehicle sill reinforcement beam according to claim 8, characterized in that, The skeleton structure is a glass fiber reinforced epoxy, polyurethane, or unsaturated resin composite material frame or a glass fiber reinforced nylon frame.

10. A car door sill, characterized in that, The composite material door sill reinforcement beam as described in any one of claims 1-9 further includes an outer door sill and an inner door sill, wherein the outer door sill and the inner door sill together form a hollow cavity, and the composite material door sill reinforcement beam is arranged in the hollow cavity and connected to the outer door sill and the inner door sill through the foam adhesive bonding structure.

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