Bumper guide plate capable of resisting vibration and impact
By using a four-layer composite buffer structure and a biomimetic airfoil guide design, the problem of insufficient buffering performance of the guide plate in vibration and shock environments is solved, achieving the effects of improved seismic performance, reduced wind resistance, and enhanced wear resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-15
- Publication Date
- 2026-03-24
Smart Images
Figure CN224028948U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of automobile bumper, concretely is a bumper fairing of anti -vibration impact. BACKGROUND
[0002] The rapid development of automobile industry makes the requirement of consumers to vehicle performance increasingly strict, and the bumper fairing of automobile is not only related to the appearance of vehicle, but also has a profound influence on the driving stability, driving comfort and safety of vehicle.
[0003] At present, the common bumper fairing of automobile on market is relatively traditional in structure design and material selection, most of the fairings are made of single material or only use simple laminated structure, the single material fairing is usually made of a specific plastic or composite material, and the manufacturing method is relatively simple and low in cost, but the performance defects are exposed when dealing with complex and changeable vibration impact environment, and the simple laminated structure fairing is combined by different materials through simple adhesion or compression, and the combination strength and synergistic effect between layers are limited, and it is difficult to fully exert the advantages of each material.
[0004] The traditional fairing has significant deficiency in buffering performance, when the vehicle encounters vibration energy of different frequencies during driving, the fairing of single material or simple laminated structure cannot effectively disperse the energy, low-frequency vibration often has large amplitude, and high-frequency vibration has high frequency, and the traditional fairing has poor adaptability when facing the two different types of vibration.
[0005] Therefore, in view of the above problems, the applicant needs to design a bumper fairing of anti-vibration impact to solve the problems. CONTENT OF THE UTILITY MODEL
[0006] The utility model aims at providing a bumper fairing of anti-vibration impact to solve the problems mentioned in the above background technology.
[0007] In order to achieve the above object, the utility model provides the following technical scheme: a bumper fairing of anti-vibration impact, including fairing body, and the fairing body is fixedly provided with a connecting frame connected with the automobile bumper,
[0008] It also includes: a composite buffer structure disposed inside the deflector body, wherein the composite buffer structure comprises a base layer, a reinforcing layer, a buffer layer and a protective layer stacked sequentially from the inside out; the base layer is butyl rubber, and the outer side of the butyl rubber contacts the inner side of the reinforcing layer; the reinforcing layer is glass fiber reinforced polyurethane, and the outer side of the glass fiber reinforced polyurethane contacts the inner side of the buffer layer; the buffer layer is closed-cell foamed silicone, and the closed-cell foamed silicone is hollow and filled with a superelastic material; the outer side of the buffer layer contacts the inner side of the protective layer; and the protective layer is a polyamide-based composite material.
[0009] Furthermore, the outer side of the composite buffer structure is provided with expanding foam, and the expanding foam is bonded to the inner surface wall of the guide plate body.
[0010] Through the above structural design, by adding foam to the outside of the composite buffer structure and bonding it to the inner wall of the guide plate body to form a secondary buffer interface, high-frequency vibration energy can be effectively absorbed, thereby improving the overall seismic performance.
[0011] Furthermore, the glass fiber of the reinforcing layer has a multi-axial woven structure with a single filament diameter of 8-15 μm and is coated with polyurethane prepreg.
[0012] Through the above structural design, the multi-axial braided glass fiber combined with the 8-15μm monofilament diameter design results in high tensile strength of the reinforcing layer. At the same time, the polyurethane prepreg coating enhances the shear strength of the fiber-matrix interface, effectively suppresses interlayer delamination, and improves the bending stiffness of the guide plate.
[0013] Furthermore, the closed-cell foamed silicone of the buffer layer has a bimodal pore size distribution, including a main pore group with a pore size of 0.1-0.3 mm and a secondary pore group with a pore size of 0.02-0.05 mm. The superelastic material is a styrene-based thermoplastic elastomer, and its volume ratio with the foamed silicone is 1:1.2.
[0014] Through the above structural design, the bimodal aperture distribution forms a hierarchical energy absorption mechanism: the main aperture group absorbs more than 80% of the impact kinetic energy through macroscopic deformation, while the secondary aperture group utilizes micropore compression to dissipate high-frequency vibrations, thereby improving the buffering performance.
[0015] Furthermore, a diamond-like carbon film with a thickness of 0.5-2 μm is formed on the outer surface of the protective layer by plasma chemical vapor deposition.
[0016] Through the above structural design, wear resistance is ensured while avoiding brittle cracking of the film layer due to excessive thickness.
[0017] Furthermore, the windward surface of the deflector body is provided with a biomimetic airfoil deflector structure, which includes alternating convex ridges and concave flow channels, and the height H of the convex ridges and the width W of the flow channels satisfy H / W=0.8-1.2.
[0018] Through the above structural design, the H / W parameter range of the biomimetic airfoil guide structure is 0.8-1.2, which can delay the airflow separation point by 30-40% of the chord length, reduce pressure drag by 15-20%, and reduce wind noise by 3-5dB at a speed of 80km / h.
[0019] Compared with the prior art, the beneficial effects of this utility model are:
[0020] This shock-resistant bumper deflector achieves multi-level impact resistance and high-frequency vibration suppression through the synergistic effect of a four-layer composite buffer structure and an outer foam layer. Specifically, the base layer dissipates energy through viscoelasticity, the reinforcing layer resists bending with multi-axial fibers, the buffer layer absorbs energy through bi-peaked pores, and the protective layer is wear-resistant and corrosion-resistant. Combined with a biomimetic airfoil deflector structure, it reduces wind resistance and wind noise. At the same time, diamond-like carbon film is used to improve wear resistance and environmental adaptability. With the lightweight foam buffer layer, weight reduction is achieved while ensuring bending stiffness. It also has the advantages of high structural stability and high applicability. Attached Figure Description
[0021] Fig. 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;
[0022] Fig. 2 This is a schematic diagram of the bumper body and composite buffer structure of this utility model;
[0023] Fig. 3 This is a schematic diagram of the layered structure of the composite buffer structure of this utility model.
[0024] In the diagram: 1. Deflector plate body; 2. Connecting frame; 3. Base layer; 4. Reinforcing layer; 5. Buffer layer; 6. Protective layer; 7. Foam. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] like Figs. 1-3As shown, this utility model discloses a bumper deflector for vibration and impact resistance, comprising a deflector body 1, and a connecting frame 2 for connecting to a car bumper is fixedly installed on the deflector body 1. It also includes a composite buffer structure disposed inside the deflector body 1, wherein the composite buffer structure comprises, from the inside out, a base layer 3, a reinforcing layer 4, a buffer layer 5, and a protective layer 6. The base layer is butyl rubber, and the outer surface of the butyl rubber contacts the inner surface of the reinforcing layer. The reinforcing layer 4 is glass fiber reinforced polyurethane, and the outer surface of the glass fiber reinforced polyurethane contacts the inner surface of the buffer layer 5. The buffer layer 5 is closed-cell foamed silicone, and the closed-cell foamed silicone is hollow and filled with a super-elastic material. The outer surface of the buffer layer 5 contacts the inner surface of the protective layer 6, and the protective layer 6 is a polyamide-based composite material.
[0027] Foam 7 is provided on the outside of the composite buffer structure, and the foam 7 is bonded to the inner wall of the guide plate body 1. By adding foam 7 on the outside of the composite buffer structure and bonding it to the inner wall of the guide plate body, a secondary buffer interface is formed. The low elastic modulus of the foam can effectively absorb high-frequency vibration energy. Its closed-cell rate of >90% can prevent moisture penetration. At the same time, it dissipates 20-30% of the impact energy through viscoelastic deformation, thereby improving the overall seismic performance and avoiding hard contact between the buffer layer and the metal body, thus reducing the occurrence rate of abnormal noise.
[0028] The glass fiber of the reinforcing layer 4 has a multi-axial braided structure with a single filament diameter of 8-15μm and is coated with polyurethane prepreg. The multi-axial braided glass fiber combined with the 8-15μm single filament diameter design results in high tensile strength of the reinforcing layer. At the same time, the polyurethane prepreg coating increases the shear strength of the fiber-matrix interface, effectively suppressing interlayer delamination and improving the bending stiffness of the deflector. Under wind pressure load at a speed of 120km / h, the deformation is <1.2mm.
[0029] The closed-cell foamed silicone of buffer layer 5 has a bimodal pore size distribution, including a main pore group with a pore size of 0.1-0.3 mm and a secondary pore group with a pore size of 0.02-0.05 mm. The superelastic material is a styrene-based thermoplastic elastomer, and its volume ratio with the foamed silicone is 1:1.2. The bimodal pore size distribution forms a hierarchical energy absorption mechanism: the main pore group of 0.1-0.3 mm absorbs more than 80% of the impact kinetic energy through macroscopic deformation, and the secondary pore group of 0.02-0.05 mm dissipates high-frequency vibration through micropore compression. The 1:1.2 volume ratio of superelastic material to foamed silicone results in a buffer layer compression rebound rate of >92%, which reduces the peak acceleration of the impact load by 40-50%, resulting in good buffering performance.
[0030] The outer surface of the protective layer 6 is formed with a diamond-like carbon film through plasma chemical vapor deposition. The film thickness is 0.5-2μm. The sp³ bond content of the diamond-like carbon film is >70%, the surface hardness reaches 15-20GPa, and the friction coefficient is reduced to 0.1-0.15. The 0.5-2μm film thickness design ensures wear resistance while avoiding brittle cracking of the film layer due to excessive thickness. The plasma deposition process makes the film adhesion force >40N and the salt spray corrosion resistance life >1000h.
[0031] The windward surface of the deflector body 1 is provided with a biomimetic airfoil deflector structure, which includes alternating convex ridges and concave flow channels. The height H of the convex ridges and the width W of the flow channels satisfy H / W=0.8-1.2. The parameter range of H / W=0.8-1.2 for the biomimetic airfoil deflector structure can delay the airflow separation point by 30-40% of the chord length, reduce the pressure drag by 15-20%, and reduce wind noise by 3-5dB at a speed of 80km / h.
[0032] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A bumper deflector resistant to vibration and impact, comprising a deflector body (1), and a connecting frame (2) for connecting to a car bumper is fixedly provided on the deflector body (1). Its features are, Also includes: The composite buffer structure is set inside the guide plate body (1), and the composite buffer structure is stacked from the inside to the outside as follows: base layer (3), reinforcement layer (4), buffer layer (5) and protective layer (6). The base layer is butyl rubber, and the outer side of the butyl rubber contacts the inner side of the reinforcement layer. The reinforcement layer (4) is glass fiber reinforced polyurethane, and the outer side of the glass fiber reinforced polyurethane contacts the inner side of the buffer layer (5). The buffer layer (5) is closed-cell foamed silicone, and the closed-cell foamed silicone is hollow and filled with superelastic material. The outer side of the buffer layer (5) contacts the inner side of the protective layer (6), and the protective layer (6) is a polyamide-based composite material.
2. The bumper deflector with vibration and impact resistance according to claim 1, characterized in that: The outer side of the composite buffer structure is provided with foam (7), and the foam (7) is bonded to the inner surface wall of the guide plate body (1).
3. The bumper deflector with vibration and impact resistance according to claim 1, characterized in that: The glass fiber of the reinforcing layer (4) has a multi-axial braided structure with a single filament diameter of 8-15 μm and is covered with polyurethane prepreg.
4. The anti-vibration and impact bumper deflector according to claim 1, characterized in that: The closed-cell foamed silicone of the buffer layer (5) has a bimodal pore size distribution, including a main pore group with a pore size of 0.1-0.3 mm and a secondary pore group with a pore size of 0.02-0.05 mm. The superelastic material is a styrene-based thermoplastic elastomer, and its volume ratio with the foamed silicone is 1:1.
2.
5. A bumper deflector for vibration and impact resistance according to claim 1, characterized in that: The outer surface of the protective layer (6) is formed with a diamond-like carbon film by plasma chemical vapor deposition, with a film thickness of 0.5-2μm.
6. A bumper deflector for vibration and impact resistance according to claim 1, characterized in that: The windward surface of the guide plate body (1) is provided with a biomimetic airfoil guide structure, which includes alternating convex ridges and concave flow channels. The height H of the convex ridge and the width W of the flow channel satisfy H / W=0.8-1.2.