Combined automobile collision energy absorption box

Abstract

The application provides a combined automobile collision energy absorption box, which comprises an upper flange, a combined energy absorber and a lower flange arranged in sequence from top to bottom; the combined energy absorber comprises a hexagonal prism type supporting shell, a double-layer gradient sandwich inner core arranged in the hexagonal prism type supporting shell and a circular truncated cone type supporting base; the double-layer gradient sandwich inner core is composed of an upper dome structure, a middle corrugated pipe and a lower dome structure; the end of the dome structure is provided with a spiral thread; the plane of the upper dome structure and the plane of the lower dome structure are oppositely arranged and connected together through the corrugated pipe; and the upper end surface of the circular truncated cone type supporting base is fixedly connected with the convex surface of the lower dome structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile passive safety protection, in particular to a combined automobile crash energy absorption box. BACKGROUND

[0002] With the rapid and high-quality development of the automobile industry, the number of cars on the market is increasing, which brings convenience to people's life, but also constantly threatens people's life and property safety due to potential safety hazards. Therefore, improving the safety of the automobile driving process has always been a research hotspot for relevant scholars at home and abroad.

[0003] The automobile energy absorption box is located between the anti-collision steel beam and the vehicle body longitudinal beam. When a car crash occurs, the automobile energy absorption box absorbs energy by collapsing and producing plastic deformation, thereby achieving the effect of protecting the passengers in the car and reducing the severity of the accident. However, the automobile energy absorption boxes on the market currently have a single structure, mostly using simple square and circular thin-walled structures, which have limited effect on crash energy absorption and cannot meet the public's demand for improving the passive safety performance of automobiles and coping with complex road conditions. Therefore, it has considerable engineering significance to design an automobile energy absorption box with excellent crash energy absorption. SUMMARY

[0004] The purpose of the present application is to provide a combined automobile crash energy absorption box, which overcomes the shortcomings of unstable energy absorption, low energy absorption efficiency and other shortcomings of traditional energy absorption boxes, and achieves the goal of stable and efficient energy absorption and reducing peak stress.

[0005] In order to solve the above technical problems, the present application provides a combined automobile crash energy absorption box, which comprises an upper flange, a combined energy absorber and a lower flange arranged in sequence from top to bottom.

[0006] The combined energy absorber comprises a hexagonal prism support shell, a double-layer gradient sandwich inner core arranged in the hexagonal prism support shell, and a circular truncated cone support base; the double-layer gradient sandwich inner core is composed of an upper arch shell structure, a middle corrugated pipe and a lower arch shell structure; the end of the arch shell structure is arranged with a spiral thread; the upper arch shell structure and the lower arch shell structure are placed with their planes facing each other and connected together through the corrugated pipe; the upper end surface of the circular truncated cone support base is fixedly connected with the convex surface of the lower arch shell structure.

[0007] In a preferred embodiment, the hexagonal prism support shell is composed of carbon fiber and aluminum alloy.

[0008] In a preferred embodiment, a plurality of induction holes are arranged on each surface of the hexagonal prism support shell along the height direction.

[0009] In a preferred embodiment, the induction holes are hexagonal.

[0010] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0011] 1. Gradual energy absorption and step-by-step energy absorption are realized, and the peak collision force is effectively reduced.

[0012] The energy absorption box has a gradient change inside, which can ensure gradual energy absorption and avoid sudden energy increase. The arch shell structure, the spiral thread at the end of the arch shell and the corrugated pipe filled with negative Poisson's ratio star-shaped honeycomb structure in the middle of the present application can effectively induce the divergence of the collision force and the deformation of the energy absorption box, thereby reducing the peak collision force.

[0013] 2. Good energy absorption level

[0014] The arch shell structure of the energy absorption box core is hollow, and a layer of chiral honeycomb structure is laid on the shell wall. The cross section specifically shows the combination of anti-four-chiral columns and four-tendon chiral structures, and the corrugated pipe filled with negative Poisson's ratio star-shaped honeycomb structure in the middle, which specifically shows the cross rule arrangement of the octagonal and quadrilateral nested negative Poisson's ratio star-shaped honeycomb structure. When the car is subjected to a collision, the structure with negative Poisson's ratio, chirality and corrugated characteristics, combined with the spiral thread at the end of the arch shell structure, can absorb a high energy and convert it into a light deformation, and the honeycomb structure can provide sufficient energy dissipation and buffering effect, realizing a high energy absorption level.

[0015] 3. Good damping and bearing effect

[0016] The chiral honeycomb structure and the negative Poisson's ratio star-shaped honeycomb structure of the combined automobile collision energy absorption box can provide sufficient damping effect, and the spiral thread at the end of the arch shell and the corrugated characteristic of the corrugated pipe in the middle can play a certain role in buffering energy impact and resisting structural instability. When the collision force on the car is too large, the honeycomb structure in the middle collapses, and the upper and lower arch shells can also continue to fit, which has a good performance in improving the bearing effect.

[0017] 4. Good mechanical properties

[0018] The six-prism outer shell wall in the structure is a double-layer carbon fiber sandwiched with aluminum alloy. The carbon fiber is a high-strength and high-modulus fiber material with good tensile performance, and the aluminum alloy has good compressive performance. The two are complementary to each other. The cross section of the aluminum alloy is corrugated, having good structural performance. In addition, multiple weight reduction holes and induction holes are provided on the upper and lower flanges and the surface of the six-prism outer shell, so that the strength and compressive resistance of the energy absorption box are further improved.

[0019] 5. High replaceability

[0020] The energy absorption main part is a double-layer sandwich core, which can change the number of sandwich cores according to actual needs, so as to adapt to the actual engineering needs. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A schematic diagram of the overall structure of the combined automotive collision box of the present invention is shown.

[0022] Figure 2 An exploded perspective view of the combined automotive collision energy-absorbing box of the present invention is shown.

[0023] Figure 3 A top view of the double-layer gradient sandwich core of the main body of the present invention is shown;

[0024] Figure 4 A schematic diagram of the structure of the double-layer gradient sandwich core of the main body of the present invention is shown (one layer is ignored);

[0025] Figure 5 A schematic diagram of the chiral honeycomb structure laid on the upper and lower arched shell walls of the main body of the present invention is shown.

[0026] Figure 6 A schematic diagram of a negative Poisson's ratio star-shaped honeycomb structure filled in the center of the main body of the present invention is shown;

[0027] Figure 7 A schematic diagram of the internal frustum-shaped support base of the present invention is shown;

[0028] Figure 8 A schematic diagram of the structure of the hexagonal prism-shaped support shell of the present invention is shown;

[0029] Figure 9 A schematic diagram of the upper and lower flanges of the present invention is shown. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0033] like Figures 1 to 9 As shown, a combined automotive collision energy-absorbing box includes an upper flange 1, a combined energy absorber 2, and a lower flange 3 arranged sequentially. The combined energy absorber 2 includes a double-layer gradient sandwich core 21, a frustum-shaped support base 22, and a hexagonal prism-shaped support shell 23. The hexagonal prism-shaped support shell has a three-layer material structure, namely, upper carbon fiber 231, aluminum alloy 232, and lower carbon fiber 233. The double-layer gradient sandwich core 21 includes two identical sandwich-type structures, specifically an upper arched shell 211, a corrugated tube 212 filled with a negative Poisson's ratio star-shaped honeycomb structure, and a lower arched shell 213. The shell walls of the arched shells 211 / 213 are covered with a chiral honeycomb structure, and the cross-section shows a combination of inverse tetrachiral prisms and tetraligament chiral structures. The corrugated tube 212 filled with a negative Poisson's ratio star-shaped honeycomb structure has a cross-section showing a regular arrangement of regular octagons and regular quadrilaterals, with the regular octagons and regular quadrilaterals filled with star-shaped honeycombs of negative Poisson's ratio.

[0034] like Figure 3 As shown, the ends of the arch shell structure 211 / 213 are provided with rotary threads. Through the double-layer gradient sandwich inner core 21, the rotary threads achieve complete fit, which has the function of vibration reduction and energy absorption.

[0035] like Figure 4 As shown, the double-layer gradient sandwich core 21 exhibits a gradient distribution in the width direction, which can induce the dispersion of collision force and the deformation of the energy absorption box. When the honeycomb structure 212 collapses, the upper arch shell 211 can contact the lower arch shell 213, presenting a complete eggshell shape and still having gradient changes. This has excellent performance in reducing peak collision force, achieving gradual energy absorption, step-by-step energy absorption, and improving energy absorption level.

[0036] like Figure 4As shown, the arched shells 211 / 213 are made of the same material and have the same structure. They are biomimetic designs inspired by the natural forms of eggshells, tortoise shells, and seashells. The hollow structure reduces the weight of the energy-absorbing box. The shell walls are covered with a chiral honeycomb structure, which fully utilizes the material's strength, increases the total energy absorption, and provides a good buffering effect. The corrugated tube 212, filled with a negative Poisson's ratio star-shaped honeycomb structure, has corrugated characteristics. The combination of corrugations and the negative Poisson's ratio star-shaped honeycomb can convert higher collision energy into lower plastic deformation, thereby enhancing the stiffness of the energy-absorbing box, improving its load-bearing capacity, and strengthening its resistance to instability. Figure 5 , Figure 6 This is a partial schematic diagram of a chiral honeycomb structure and a negative Poisson's ratio star honeycomb structure.

[0037] like Figure 8 As shown, the hexagonal prism-shaped support shell 23 has a three-layer material structure, with an aluminum alloy layer 232 sandwiched between the upper carbon fiber layer 231 and the lower carbon fiber layer 233. The aluminum alloy layer has a corrugated cross-section. Corrugated structures have always been effective in impact resistance, vibration reduction, and improving structural rigidity. The combination of high-strength carbon fiber and aluminum alloy with a corrugated structure gives the energy-absorbing box advantages in vibration reduction, energy absorption, and lightweighting. Furthermore, several hexagonal induction holes are regularly spaced on the surface of the hexagonal prism-shaped support shell 23, which can accommodate the needs of impact energy dissipation and further reduce the overall weight of the energy-absorbing box. Figure 9 As shown, the upper flange 1 and the lower flange 3 have the same structure, and both of them have weight reduction holes on their surfaces, which can also contribute to the lightweighting of the energy absorption box and reduce the burden on the vehicle.

[0038] The hexagonal prism-shaped support shell in the combined energy absorber is constructed from carbon fiber and aluminum alloy. Both materials exhibit excellent performance in weight reduction, vibration damping, and energy absorption. Furthermore, the good tensile strength of carbon fiber combines with the good compressive strength of aluminum alloy to improve the structure's load-bearing capacity. In addition, the surface of the hexagonal prism-shaped support shell is regularly perforated with several hexagonal induction holes, which can reduce the weight of the energy absorption box and absorb some energy, inducing energy dissipation.

[0039] The main body of the combined energy absorber is a double-layered gradient sandwich core structure, consisting of two identical sandwich core structures. The sandwich core structure includes an upper arched shell, a central corrugated tube, and a lower arched shell. The two sandwich cores are completely fitted together by a spiral thread at the end of the arched shell. The arched shell structure is a biomimetic hollow structure derived from eggshells, tortoise shells, and seashells, with a thin layer of chiral honeycomb structure on the shell wall. In the event of a car collision, this structure can reduce the peak impact force and improve the car's vibration damping capacity. The central corrugated tube is filled with a negative Poisson's ratio star-shaped honeycomb structure, offering advantages such as lightweight, high energy absorption, and high load-bearing capacity.

[0040] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A modular automobile crash energy box, characterized in that The combined energy absorber comprises a six-prism supporting shell, a double-layer gradient sandwich inner core arranged in the six-prism supporting shell, and a circular-truncated-cone supporting base. The double-layer gradient sandwich inner core is composed of an upper arch shell structure, a middle corrugated pipe, and a lower arch shell structure. The end of the arch shell structure is arranged with a convolutional thread.

2. The modular automobile crash energy management box of claim 1, wherein: The upper and lower arch shell structures are arranged in a plane-to-plane manner and are connected together through the corrugated pipe.

3. The modular automobile crash energy management box of claim 1, wherein: The upper end surface of the circular-truncated-cone supporting base is fixedly connected with the convex surface of the lower arch shell structure.

4. The modular automobile crash energy management box of claim 3, wherein: The corrugated pipe filled with negative Poisson's ratio star-shaped honeycomb structure has a cross section in the form of a regular arrangement of regular octagons and regular quadrilaterals. The six-prism supporting shell is composed of carbon fiber and aluminum alloy. Each surface of the six-prism supporting shell is provided with a plurality of induction holes spaced apart along the height direction. The induction hole is hexagonal.

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