An energy absorbing box inspired by woodpecker beaks

Abstract

The application discloses a woodpecker beak inspired energy absorption box, and the unit body of the inner core comprises a torsion-resistant circular tube and an anti-oblique impact tube; a plurality of the torsion-resistant circular tubes are arranged in a square shape, and a semicircular tube is arranged in the gap between each adjacent two of the torsion-resistant circular tubes closest to the anti-oblique impact tube and the anti-oblique impact tube; the anti-oblique impact tube is composed of an inclined connecting structure, a bird feather imitating three-axis plate and a bird feather imitating single-axis plate; the inclined side of the inclined connecting structure is fixed to the outer side of the bird feather imitating three-axis plate or the bird feather imitating single-axis plate; and the inclined connecting structure of the unit body one is embedded into the corresponding inclined connecting structure of the adjacent unit body two. The inclined connecting structure of the anti-oblique impact tube disperses the oblique impact force and reduces the axial impact force, the bird feather imitating three-axis plate and the bird feather imitating single-axis plate have high elastic modulus, compressive strength and specific energy absorption; and the torsion-resistant tube improves the torsion resistance, cooperates with the circular tube and the semicircular tube to trigger a high-order buckling mode, and achieves higher energy absorption effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile safety technology, and particularly relates to an energy absorption box inspired by the beak of woodpecker. BACKGROUND

[0002] With the rapid development of China's automobile industry and the improvement of people's living standards, the number of vehicles in China is growing rapidly, and the problem of traffic safety is attracting more and more attention. Collision is the main form of traffic accidents, which brings great hidden troubles to people's life and property. Energy absorption box as a typical thin-walled metal structure can effectively reduce the damage to the occupants in the car caused by the collision by dissipating the impact energy through its plastic buckling deformation, fracture and other forms when the car collides.

[0003] In nature, woodpeckers show extraordinary ability to resist head impact damage. When woodpeckers peck the trunk to find food, catch insects and build nests, the maximum pecking speed of the woodpecker's head is about 6-7 m / s, and the maximum deceleration of the woodpecker's head is about 1000g (g is the acceleration of gravity). In order to withstand such violent impact, woodpeckers have evolved special features to protect their brains and eyes. For example, the long hyoid bone around the head, the smooth skull and the straight, unequal length beak. The nanostructure of the woodpecker's beak shows a closely packed wave-shaped configuration at the grain boundary, which improves the resistance to local shear and enhances the impact resistance and damage tolerance.

[0004] If a new type of energy absorption box can be inspired by the structure of the woodpecker's beak, the impact resistance of the energy absorption box can be improved. SUMMARY

[0005] In order to improve the energy absorption capacity of the energy absorption box, the present application provides an energy absorption box inspired by the beak of woodpecker.

[0006] The technical scheme adopted by the present application is:

[0007] The present application comprises a front mounting plate, an inner core and an energy absorption box body; the inner core is fixed in the energy absorption box body, and the front mounting plate is fixed with the inner core and the energy absorption box body. The inner core is composed of a plurality of square arranged unit bodies, the unit bodies are divided into unit body one and a plurality of unit body two, and in any two adjacent unit bodies, one is unit body one and the other is unit body two. The unit body one and the unit body two each comprise an anti-torsion circular pipe, a semi-circular pipe and an anti-oblique impact pipe, a plurality of anti-torsion circular pipes are arranged in a square, and the outer walls of adjacent anti-torsion circular pipes are fitted; the anti-torsion circular pipe is fixed in the anti-oblique impact pipe; in each anti-torsion circular pipe closest to the anti-oblique impact pipe, a semi-circular pipe is arranged in the gap formed by each adjacent two anti-torsion circular pipes and the anti-oblique impact pipe, the outer arc surface of the semi-circular pipe is tangent to and fixed with the two adjacent anti-torsion circular pipes, and the plane of the semi-circular pipe is fixed with the inner wall of the anti-oblique impact pipe.

[0008] The anti-oblique impact pipe is composed of an oblique connecting structure, two pieces of bird feather-like three-axis plates and two pieces of bird feather-like single-axis plates; the bird feather-like three-axis plate is composed of a middle axis, a side axis one, a side axis two, main oblique branches and branch oblique branches; the middle axis, the side axis one and the side axis two are vertically arranged; the side axis one and the side axis two are fixedly connected with the middle axis through the main oblique branches, the included angle between each main oblique branch and the middle axis is equal and ranges from 30° to 60°; the distance between adjacent main oblique branches gradually decreases along the axis direction in which the middle axis and the main oblique branches form an acute angle; each adjacent two main oblique branches are fixedly connected through the equidistantly arranged branch oblique branches; the main oblique branch at the end along the axis direction in which the middle axis and the main oblique branches form an acute angle is fixedly connected with the middle axis through the equidistantly arranged branch oblique branches; the included angle between the branch oblique branch and the middle axis ranges from 30° to 60°. Compared with the bird feather-like three-axis plate, the bird feather-like single-axis plate lacks the side axis one and the side axis two and has the same structure; each main oblique branch on one side of the bird feather-like single-axis plate is fixedly connected with the side axis two of an adjacent bird feather-like three-axis plate, and each main oblique branch on the other side of the bird feather-like single-axis plate is fixedly connected with the side axis one of another adjacent bird feather-like three-axis plate. The oblique connecting structure is V-shaped, one side is vertically arranged and the other side is obliquely arranged, and the included angle between the oblique side and the axis direction in which the middle axis and the main oblique branches form an acute angle ranges from 30° to 60°; a plurality of oblique connecting structures are equidistantly arranged on the bird feather-like three-axis plate and the bird feather-like single-axis plate; the oblique side of the oblique connecting structure is fixedly connected with the outer side of the bird feather-like three-axis plate or the bird feather-like single-axis plate.

[0009] The oblique connecting structure of one of the unit body one and the unit body two faces upward, the oblique connecting structure of the other faces downward, and each oblique connecting structure of the unit body one is embedded into the corresponding oblique connecting structure of the adjacent unit body two.

[0010] Preferably, one pipe is arranged in the space of every four adjacent anti-torsion pipes, and the outer wall of the pipe is in close contact with and fixed to the four adjacent anti-torsion pipes.

[0011] Preferably, the inner wall of the anti-torsion pipe is provided with positive and negative double helix convex structures.

[0012] Preferably, the inner core and the energy absorption box body are made of aluminum alloy material.

[0013] The beneficial effects of the present application are as follows:

[0014] 1. The energy absorption box inspired by woodpecker beak, when subjected to oblique impact, the inclined connection structure of the anti-oblique impact pipe disperses the oblique impact force, so that the inclined impact force is more evenly transmitted to the entire energy absorption box, improving the stability of the entire energy absorption box, and the inclined connection structure is equivalent to a reinforcing rib, improving the bending stiffness of the entire energy absorption box, which is more conducive to resisting oblique impact.

[0015] 2. The energy absorption box inspired by woodpecker beak, during lateral collision, torsion will be caused, at this time, the anti-torsion pipe not only improves the overall anti-torsion ability of the energy absorption box, but also cooperates with the circular pipe and the semi-circular pipe to trigger a high-order buckling mode, which requires higher energy to excite, thereby achieving higher energy absorption effect.

[0016] 3. The energy absorption box inspired by woodpecker beak, when subjected to frontal impact, the inclined connection structure of the anti-oblique impact pipe propagates the axial impact force to the transverse direction, reducing the axial impact force, so that the energy absorption box can absorb more collision energy in the axial direction, increasing the safety of the vehicle.

[0017] 4. The energy absorption box inspired by woodpecker beak, the anti-oblique impact pipe is a square pipe with inclined connection structure inspired by bird beak wave structure and bird feather, which is composed of two pieces of bird feather three-axis plate and two pieces of bird feather single-axis plate opposite to each other, forming a feather-like gradient structure. Among the four walls of the anti-oblique impact pipe, the distance between adjacent main inclined branches changes along the axial direction (frontal impact direction), which helps to make the anti-oblique impact pipe bend along the diagonal plane, so that the gradient structure has higher elastic modulus, compressive strength and specific energy absorption compared with the uniform structure. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the overall structure schematic diagram of the present application;

[0019] Figure 2 is the inner core structure schematic diagram of the present application;

[0020] Figure 3 is the unit body structure schematic diagram of the present application;

[0021] Figure 4 is the anti-oblique impact pipe structure schematic diagram of the present application;

[0022] Figure 5 is the anti-torsion circular pipe half-section schematic diagram of the present application;

[0023] Figure 6 is the unit body top view of the present application. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features of the present application, the present application will be described in detail below with reference to the drawings.

[0025] As shown in Figure 1 , an energy absorption box inspired by woodpecker's beak, comprising a front mounting plate 1, an inner core 2 and an energy absorption box body 3; the inner core 2 is fixed in the energy absorption box body 3, and the front mounting plate 1 is fixed with the inner core 2 and the energy absorption box body 3.

[0026] As shown in Figure 2 , the inner core 2 is composed of a plurality of square arranged unit bodies, the unit bodies are divided into unit body one and a plurality of unit body two, any two adjacent unit bodies, one is unit body one, the other is unit body two. As shown in Figure 3 and Figure 6 , the unit body one and the unit body two both include anti-torsion round pipe 4, semi-circular pipe 6 and anti-oblique impact pipe 7; a plurality of anti-torsion round pipes are arranged in a square, and the outer walls of adjacent anti-torsion round pipes are fitted; the anti-torsion round pipe is fixed in the anti-oblique impact pipe 7; in each anti-torsion round pipe closest to the anti-oblique impact pipe 7, a semi-circular pipe 6 is arranged in the gap formed by every two adjacent anti-torsion round pipes 4 and the anti-oblique impact pipe 7, the outer arc surface of the semi-circular pipe 6 is tangent to and fixed with the two adjacent anti-torsion round pipes 4, and the plane (sectional surface) of the semi-circular pipe is fixed with the inner wall of the anti-oblique impact pipe 7. The anti-oblique impact pipe 7 and the inner core cooperate to enhance the bending stiffness, torsional stiffness and anti-oblique impact capacity of the unit body, and excite the unit body to form high-order buckling, which will consume more energy to achieve the purpose of absorbing more impact energy.

[0027] As shown in Figure 4As shown, the anti-oblique impact pipe 7 is composed of an oblique connecting structure 10, two pieces of bird feather-like three-axis plates 8 and two pieces of bird feather-like single-axis plates 9. The bird feather-like three-axis plate 8 is composed of a middle axis, a side axis one, a side axis two, main oblique branches and branch oblique branches. The middle axis, the side axis one and the side axis two are vertically arranged. The side axis one and the side axis two are fixedly connected with the middle axis through the main oblique branches. The included angle between each main oblique branch and the middle axis is equal and ranges from 30° to 60°. The distance between adjacent main oblique branches gradually decreases along the axis direction in which the middle axis and the main oblique branches form an acute angle, which helps the anti-oblique impact pipe to bend along the diagonal plane and makes the gradient structure have higher elastic modulus, compressive strength and specific energy absorption than the uniform structure. Each adjacent two main oblique branches are fixedly connected through the equidistantly arranged branch oblique branches. The main oblique branch at the end along the axis direction in which the middle axis and the main oblique branches form an acute angle is fixedly connected with the middle axis through the equidistantly arranged branch oblique branches. The included angle between the branch oblique branch and the middle axis ranges from 30° to 60°, which plays a role in enhancing the compressive stiffness and dispersing stress. The bird feather-like single-axis plate 9 is the same as the bird feather-like three-axis plate 8 except that it lacks the side axis one and the side axis two. Each main oblique branch on one side of the bird feather-like single-axis plate 9 is fixedly connected with the side axis two of the adjacent bird feather-like three-axis plate 8, and each main oblique branch on the other side of the bird feather-like single-axis plate 9 is fixedly connected with the side axis one of the adjacent bird feather-like three-axis plate 8. The oblique connecting structure 10 is V-shaped, one side of which is vertically arranged and the other side of which is obliquely arranged. The included angle between the oblique side and the axis direction in which the middle axis and the main oblique branches form an acute angle ranges from 30° to 60°. A plurality of oblique connecting structures are equidistantly arranged on the bird feather-like three-axis plate 8 and the bird feather-like single-axis plate 9. The oblique side of the oblique connecting structure 10 is fixedly connected with the outer side of the bird feather-like three-axis plate 8 or the bird feather-like single-axis plate 9. When the oblique connecting structure 10 is subjected to impact, it plays a role in dispersing the axial and oblique impact forces.

[0028] The unit body one and the unit body two are upside down. The oblique connecting structure 10 of one of them faces upward and the oblique connecting structure 10 of the other one faces downward. Each oblique connecting structure 10 of the unit body one is embedded in the corresponding oblique connecting structure 10 of the adjacent unit body two. The embedded oblique connecting structures are connected in a nested manner, which can disperse the impact force when facing the oblique impact, make the oblique impact force more evenly transmitted to the entire inner core, improve the bending stiffness of the entire inner core, guide the inner core to excite high-order buckling, and enhance the energy absorption effect.

[0029] As a preferred embodiment, as shown in Figure 3 and Figure 6 Each four adjacent anti-torsion circular pipes are provided with a circular pipe 5 in the gap therebetween. The outer wall of the circular pipe 5 is in close contact with and fixed to the four adjacent anti-torsion circular pipes. The circular pipe 5 can further form a high-order buckling effect and achieve the purpose of absorbing more impact energy.

[0030] As a preferred embodiment, as shown in Figure 5 The inner wall of the anti-torsion circular tube 4 is provided with a positive and negative double-helix convex structure, which can enhance the torsional rigidity and axial rigidity of the anti-torsion circular tube 4 in the collision, and improve the energy absorption capacity.

[0031] As a preferred embodiment, the inner core 2 and the energy absorption box body 3 are made of aluminum alloy materials.

[0032] When the present application is used on the front and rear bumpers of a vehicle, it is placed between the gap between the front and rear bumpers of the vehicle body and the inner beam of the vehicle. The front mounting plate 1 is connected to the bumper through bolts, and the energy absorption box body 3 is connected to the inner beam of the vehicle through bolts. When the front and rear bumpers of the vehicle are impacted, if the present application is subjected to an oblique impact, the oblique connection structure of the anti-oblique impact tube will disperse the oblique impact force, so that the oblique impact force is more evenly transmitted to the entire energy absorption box, improving the stability of the entire energy absorption box. At the same time, the oblique connection structure acts as a reinforcing rib, improving the bending stiffness of the entire energy absorption box, which is more conducive to resisting oblique impact. If the present application is subjected to a lateral impact, it will cause torsion. At this time, the anti-torsion tube not only improves the overall torsion resistance of the energy absorption box, but also cooperates with the circular tube and the semi-circular tube to trigger a high-order buckling mode. This mode requires higher energy to excite, thereby achieving higher energy absorption effect. If the present application is subjected to a frontal impact, the oblique connection structure of the anti-oblique impact tube will transmit the axial impact force to the transverse direction, reducing the axial impact force, so that the energy absorption box can absorb more collision energy in the axial direction, increasing the safety of the vehicle. The spacing between adjacent main oblique branches on the bird feather three-axis plate and the bird feather single-axis plate changes continuously along the axial direction, which helps the anti-oblique impact tube to buckle along the diagonal plane, so that the gradient structure has higher elastic modulus, compressive strength and specific energy absorption than the uniform structure.

Claims

1. A woodpecker beak inspired energy absorption box, comprising a front mounting plate, an inner core and an energy absorption box body; the inner core is fixed in the energy absorption box body, and the front mounting plate is fixed with the inner core and the energy absorption box body; characterized in that: The inner core is composed of a plurality of square arranged unit bodies, the unit bodies are divided into unit body one and unit body two, any two adjacent unit bodies are one unit body one and the other unit body two; the unit body one and the unit body two both include anti-torsion circular pipes, semi-circular pipes and anti-oblique impact pipes, a plurality of anti-torsion circular pipes are arranged in a square, and the outer walls of adjacent anti-torsion circular pipes are attached; the anti-torsion circular pipes are fixed in the anti-oblique impact pipes; in each anti-torsion circular pipe closest to the anti-oblique impact pipe, a semi-circular pipe is arranged in the gap formed by every two adjacent anti-torsion circular pipes and the anti-oblique impact pipe, the outer arc surface of the semi-circular pipe is tangent to and fixed with the two adjacent anti-torsion circular pipes, and the plane of the semi-circular pipe is fixed with the inner wall of the anti-oblique impact pipe; The anti-oblique impact pipe is composed of an oblique connecting structure, two pieces of bird feather-like three-axis plates and two pieces of bird feather-like single-axis plates; the bird feather-like three-axis plate is composed of a middle axis, a side axis one, a side axis two, a main oblique branch and a branch oblique branch; the middle axis, the side axis one and the side axis two are vertically arranged; the side axis one and the side axis two are fixedly connected with the middle axis through a plurality of main oblique branches, the included angle between each main oblique branch and the middle axis is equal and ranges from 30° to 60°; the distance between adjacent main oblique branches gradually decreases along the axis direction in which the middle axis and the main oblique branch form an acute angle; a plurality of branch oblique branches are fixedly connected between every two adjacent main oblique branches; the main oblique branch at the endmost along the axis direction in which the middle axis and the main oblique branch form an acute angle is fixedly connected with the middle axis through a plurality of branch oblique branches; the included angle between the branch oblique branch and the middle axis ranges from 30° to 60°; the bird feather-like single-axis plate is the same as the bird feather-like three-axis plate in other structures except that the bird feather-like single-axis plate lacks the side axis one and the side axis two; each main oblique branch on one side of the bird feather-like single-axis plate is fixedly connected with the side axis two of an adjacent bird feather-like three-axis plate, and each main oblique branch on the other side of the bird feather-like single-axis plate is fixedly connected with the side axis one of another adjacent bird feather-like three-axis plate; the oblique connecting structure is V-shaped, one side is vertically arranged and the other side is obliquely arranged, and the included angle between the oblique side and the axis direction in which the middle axis and the main oblique branch form an acute angle ranges from 30° to 60°; a plurality of oblique connecting structures are arranged on the bird feather-like three-axis plate and the bird feather-like single-axis plate in an equal distance manner; the oblique side of the oblique connecting structure is fixedly connected with the outer side of the bird feather-like three-axis plate or the bird feather-like single-axis plate; The oblique connecting structure of one of the unit body one and the unit body two faces upward, the oblique connecting structure of the other faces downward, and the oblique connecting structures of the unit body one are embedded in the corresponding oblique connecting structures of the adjacent unit body two.

2. A woodpecker beak inspired energy absorption box according to claim 1, characterized in that: A circular pipe is arranged in the gap of every four adjacent anti-torsion circular pipes, and the outer wall of the circular pipe is attached to and fixed with the four adjacent anti-torsion circular pipes.

3. The woodpecker beak inspired energy absorption box of claim 1, wherein: The inner wall of the anti-torsion circular pipe is provided with positive and negative double helix convex structures.

4. The woodpecker beak inspired energy absorption box of claim 1, wherein: The inner core and the energy absorption box body are both made of aluminum alloy.

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