Backhanded filling structure and automobile anti-collision beam

Abstract

The present invention provides a backhanded filling structure and an automobile anti-collision beam, wherein the backhanded filling structure comprises: three backhanded units, wherein the backhanded units comprise a pitch circle and eight ligaments, wherein the pitch circle comprises four quadrant points evenly spaced apart, wherein every two ligaments define a ligament group, wherein four ligament groups are evenly spaced apart circumferentially on the pitch circle, wherein the first ends of two ligaments in the ligament group extend toward the pitch circle and intersect perpendicularly, and the second ends are tangent to the pitch circle and connected to two of the quadrant points of the pitch circle, wherein the centers of the pitch circles of the three backhanded units coincide and are connected to the quadrant points in pairs, intersecting perpendicularly. The application of this technical solution can realize a backhanded filling structure having light weight, high compressive strength and good energy absorption effect, which is beneficial to improving the buffering effect and an automobile anti-collision beam filled with the backhanded filling structure.

Description

Technical Field

[0001] The invention relates to the field of automobile accessories, in particular to a backhanded filling structure and an automobile anti-collision beam. Background Art

[0002] In today's society, the collision safety performance of buses has attracted much attention. The anti-collision and energy-absorbing structure at the front end of the frame - the bumper is the main protective structure and the first line of defense for the entire vehicle after a collision.

[0003] In the past, the anti-collision energy absorption structure of the anti-collision beam of passenger cars was mostly a structure with a cross section in which the anti-collision beam and the energy absorption box were separated. The structure is composed of a combination of hollow square tubes or round tubes of equal wall thickness. The anti-collision energy absorption structure absorbs the collision energy by its own collapse deformation, and this single anti-collision energy absorption structure can only control the collapse deformation by designing its own energy absorption ribs and cross-sectional shape. In the event of a medium- and high-speed collision, the energy absorption is weak and the collapse form is unstable, which cannot provide good protection for either the longitudinal beam of the vehicle body or the passengers in the vehicle. In addition, no matter what kind of collision occurs, the anti-collision energy absorption structure will be partially deformed and must be replaced during maintenance, increasing the maintenance cost. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a backhanded filling structure and an automobile anti-collision beam. The backhanded filling structure is simultaneously light in weight, has high compressive strength and good energy absorption effect, and is conducive to improving the buffering effect.

[0005] In order to solve the above technical problems, the present invention provides a reverse chiral filling structure, comprising:

[0006] Three backhanded units, the backhanded units include a pitch circle and eight ligaments, the pitch circle includes four quadrant points evenly spaced apart, every two ligaments define a ligament group, four ligament groups are evenly spaced apart circumferentially on the pitch circle, the first ends of two ligaments in the ligament group extend toward the pitch circle and intersect perpendicularly, and the second ends are tangentially connected to the pitch circle at two of the quadrant points of the pitch circle, wherein the centers of the pitch circles of the three backhanded units coincide and are connected to the quadrant points in pairs, intersecting perpendicularly.

[0007] Preferably, the reverse chiral filling structure is made of a hollow tube.

[0008] Preferably, the hollow tube is a square tube.

[0009] Preferably, the wall thickness of the hollow tube is 0.1 mm.

[0010] The present invention also provides an automobile anti-collision beam suitable for being installed at the front end of an automobile, comprising:

[0011] A shell surrounding and defining a filling space;

[0012] It also includes a plurality of the reverse-handed filling structures, wherein an array of the reverse-handed filling structures is filled in the filling space, and two adjacent reverse-handed filling structures are connected to the first end of the ligament, wherein the connected ligaments are collinear, and one of the pitch circles of the reverse-handed filling structure is perpendicular to the forward direction of the vehicle.

[0013] Preferably, the reverse-handed filling structure of the array filling is integrally formed by 3D printing.

[0014] Preferably, the outer shell includes a structural shell plate, which includes a front shell plate and a rear shell plate arranged at intervals along the forward direction of the automobile, the rear shell plate includes two connecting plates arranged at intervals, and the connecting plates are used to be connected to the automobile, the rear shell plate also includes a rear shell inner plate connected between the two connecting plates, the rear shell plate also includes a rear shell outer plate connected to one side of the connecting plate and the structural shell, and the front shell plate is arc-shaped and bends along the forward direction.

[0015] Preferably, the rear shell outer plate is arc-shaped and bends toward the front shell plate, wherein the wall thickness at both ends of the rear shell outer plate gradually increases toward the middle portion of the rear shell plate.

[0016] Preferably, the rear shell inner plate includes two arc-shaped inner plates, which are bent toward the front shell plate, one end of the arc-shaped inner plate is connected to the connecting plate, and the other end is connected to another arc-shaped inner plate, wherein the wall thickness at both ends of the arc-shaped inner plate gradually increases toward the middle part of the arc-shaped inner plate.

[0017] Preferably, the shell further comprises a carbon fiber thin-wall outer layer coated outside the structural shell plate, and the carbon fiber thin-wall outer layer comprises four overlapping layers of carbon fiber reinforced composite materials with different fiber laying directions.

[0018] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0019] 1. The backhanded filling structure is light in weight and has good impact resistance.

[0020] The automobile anti-collision beam adopts the reverse-handed filling structure for internal filling, which improves the anti-collision strength of the automobile anti-collision beam while significantly reducing the overall mass (increasing specific energy absorption), which will be beneficial to energy conservation and emission reduction of the automobile and improvement of the automobile's dynamic performance.

[0021] 2. The car's anti-collision beam has a good buffering effect and a stable energy absorption process

[0022] The rear shell outer plate and rear shell inner plate of the automobile anti-collision beam are thickened arc-shaped shells, and the structural shell is covered with a thin-walled outer layer of carbon fiber. These structures can steadily dissipate pressure during a collision, especially in high-speed collisions, while increasing the total energy absorption and effectively ensuring the stability of energy absorption, which is beneficial to the protection of the internal structure of the bus and the safety of passengers.

[0023] 3. The car's anti-collision beam has good energy absorption effect and fast energy dissipation

[0024] The internal array of the automobile anti-collision beam is filled with a reverse-handed filling structure, which utilizes the reverse-handed filling structure of the array to dissipate energy, so that energy is quickly dissipated during a collision, which is beneficial to the protection of the automobile's internal structure and the protection of passenger safety.

[0025] 4. The deformation of the car's anti-collision beam is stable and the failure result is controllable

[0026] The anti-chirality filling structure of the automobile anti-collision beam array is prepared as a whole through 3D printing, which is conducive to improving the overall mechanical properties of the anti-collision structure. The arc structure of the front shell plate combined with the anti-chirality filling structure of the array is conducive to guiding the deformation and collapse direction and controlling the failure mode of the anti-collision energy absorption structure, so that the failure result of the automobile anti-collision beam is controllable, which is conducive to the protection of the internal structure of the automobile, thereby ensuring the safety of the passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional schematic diagram of a reverse-handed filling structure in a preferred embodiment of the present invention, showing that three reverse-handed units intersect each other perpendicularly at quadrant points;

[0028] Figure 2 A schematic plan view of a reverse chirality unit in a preferred embodiment of the present invention;

[0029] Figure 3 It is a three-dimensional schematic diagram of two reverse-handed units vertically intersecting at a quadrant point in a preferred embodiment of the present invention;

[0030] Figure 4 A schematic plan view of a basic unit in a preferred embodiment of the present invention;

[0031] Figure 5 A three-dimensional schematic diagram of an automobile anti-collision beam in a preferred embodiment of the present invention;

[0032] Figure 6 A schematic cross-sectional view of an automobile anti-collision beam in a preferred embodiment of the present invention;

[0033] Figure 7 It is a partial cross-sectional schematic diagram of an automobile anti-collision beam in a preferred embodiment of the present invention;

[0034] Figure 8It is a schematic diagram of the arrangement of the array of reverse-handed filling structures in a preferred embodiment of the present invention, showing the relative relationship with the forward direction of the car;

[0035] Fig. 9 It is a partial cross-sectional schematic diagram of the shell in a preferred embodiment of the present invention, showing the structural shell and the carbon fiber thin-walled outer layer. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0038] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0039] See also Figure 1-4 A reverse chiral filling structure 10 comprises: three reverse chiral units 1, wherein the reverse chiral units 1 comprise a pitch circle 11 and eight ligaments 12, wherein the pitch circle 11 comprises four quadrant points 111 evenly spaced apart, wherein every two ligaments 12 define a ligament group 121, wherein the four ligament groups 121 are evenly spaced apart circumferentially on the pitch circle 11, wherein the first ends 122 of two ligaments 12 in the ligament group 121 extend toward the pitch circle 11 and intersect perpendicularly, and the second ends 123 are tangentially connected to the pitch circle 11 at the quadrant point 111 of the pitch circle 11, wherein the centers of the pitch circles 11 of the three reverse chiral units 1 coincide and are connected to the quadrant point 111 at right angles to each other in pairs.

[0040] For details, see Figure 4 Each backhanded unit 1 can be split into two basic units 13, the basic unit 13 includes a pitch circle 11 and four ligaments 12, the ligaments 12 of the basic unit 13 are tangentially connected to the quadrant points 111 of the pitch circle 11 of the basic unit 13, the ligaments 12 of the basic unit 13 extend in the counterclockwise or clockwise direction at the same time, and the extension directions of two adjacent ligaments 12 of the basic unit 13 are perpendicular. When the basic units 13 are combined into the backhanded unit 1, the pitch circles 11 of the two mirror-symmetrical basic units 13 overlap, and the quadrant points 111 of the two pitch circles 11 overlap, and the ligaments 12 of the basic unit 13 intersect perpendicularly to form the backhanded unit 1.

[0041] From the perspective of the force of the basic unit 13, during the load-bearing process, the force is transmitted to the pitch circle 11 of the basic unit 13 through the ligament 12 of the basic unit 13, so that the pitch circle 11 has a tendency to rotate, and at the same time, the ligament 12 of the basic unit 13 is rolled up to form a negative Poisson's ratio state with a reduced compression section and an increased tension section. Because the reverse-handed unit 1 has two mirror-symmetrical basic units 13, the pitch circle 11 of the reverse-handed unit 1 receives counterclockwise and clockwise rotation trends respectively, so the rotation trends of the pitch circle 11 of the reverse-handed unit 1 offset each other, and the force of the pitch circle 11 of the reverse-handed unit 1 is more stable. In addition, in the reverse-handed unit 1, the vertical intersection of the ligaments 12 makes it easy for the reverse-handed unit 1 to generate stress concentration at the intersection of the vertical ligaments 12 when it is subjected to vertically intersecting forces. The arc section of the pitch circle 11 between the two quadrant points 111 can avoid this stress concentration phenomenon.

[0042] In addition, because the backhanded filling structure 10 has three backhanded units 1 and the centers of the nodal circles 11 of the three backhanded units 1 coincide and are vertically intersected and connected in pairs at the quadrant point 111, when the backhanded filling structure 10 is impacted, the three nodal circles 11 of the backhanded filling structure 10 are not easily dislocated or deformed, and the overall structure is more stable, so that its load-bearing capacity and energy absorption capacity are stronger.

[0043] In this embodiment, the backhandedness unit 1 is made of a hollow tube. More specifically, the hollow tube is a square tube, and the wall thickness of the hollow tube is 0.1 mm. The backhandedness filling structure 10 is made by 3D printing technology. The backhandedness filling structure 10 has the characteristics of light weight, high specific strength and high specific modulus. The backhandedness filling structure 10 also has excellent pressure-bearing performance and isotropic expansion characteristics, which can effectively ensure the stability of energy absorption while improving the total energy absorption.

[0044] See also Figure 6-9 , showing an automobile anti-collision beam 100, which is suitable for being installed at the front end of an automobile. The automobile anti-collision beam 100 includes a shell 20, which defines a filling space 21 around it. The automobile anti-collision beam 100 also includes a plurality of the reverse-handed filling structures 10, and the reverse-handed filling structure 10 array is filled in the filling space 21. The reverse-handed filling structure 10 of the array is integrally formed by 3D printing technology, and two adjacent reverse-handed filling structures 10 are connected to the first end 122 of the ligament 12, wherein the connected ligaments 12 are collinear, and one of the pitch circles 11 of the reverse-handed filling structure 10 is perpendicular to the forward direction 200 of the automobile.

[0045] The outer shell 20 includes a structural shell plate 22, which includes a front shell plate 221 and a rear shell plate 222 arranged at intervals along the forward direction 200 of the automobile. The rear shell plate 222 includes two spaced connecting plates 2221, which are used to be connected to the automobile. The rear shell plate 222 also includes a rear shell inner plate 2222 connected between the two connecting plates 2221. The rear shell plate 222 also includes a rear shell outer plate 2223 connected to the connecting plate 2221 and one side of the structural shell. The structural shell plate 22 also includes a side shell plate 223 connected between the front shell plate 221 and the rear shell plate 222. The side shell plate 223, the front shell plate 221 and the rear shell plate 222 together define the filling space 21. The connecting plate 2221 is provided with a plurality of connecting holes 2224. The automobile anti-collision beam 100 is installed on the automobile by passing through the connecting holes 2224 through bolts and other components.

[0046] The front shell plate 221 is arc-shaped and bends toward the forward direction 200. The front shell plate 221 is combined with the reverse-handed filling structure 10. When the front shell body is impacted, the impact force is dispersed to both sides of the automobile anti-collision beam 100. The rear shell outer plate 2223 is arc-shaped and bends toward the front shell plate 221, wherein the wall thickness at both ends of the rear shell outer plate 2223 gradually increases toward the middle part of the rear shell plate 222. The thickness change of the rear shell outer plate 2223 can enhance the bending resistance of the rear shell outer plate 2223, thereby improving the anti-collision performance of the overall structure. The rear shell inner plate 2222 includes two arc-shaped inner plates 2225, which are bent toward the front shell plate 221, one end of the arc-shaped inner plate 2225 is connected to the connecting plate 2221, and the other end is connected to another arc-shaped inner plate 2225, wherein the wall thickness of the two ends of the arc-shaped inner plate 2225 gradually increases toward the middle part of the arc-shaped inner plate 2225. The rear shell inner plate 2222 is one of the main bearing structures, and this thickened arc structure can steadily dissipate the impact load, reduce the impact peak force, and effectively protect the safety of the vehicle occupants. The outer shell 20 also includes a carbon fiber thin-walled outer layer 23 coated outside the structural shell plate 22, and the carbon fiber thin-walled outer layer 23 includes four layers of overlapping carbon fiber reinforced composite materials with different fiber ply directions. The carbon fiber reinforced composite materials have excellent mechanical properties such as light weight and high strength, so the carbon fiber thin-walled outer layer 23 can improve the anti-collision performance of the overall structure.

[0047] The above is only a preferred specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A reverse chiral filling structure, characterized in that: include: Three backhanded units, the backhanded units include a pitch circle and eight ligaments, the pitch circle includes four quadrant points evenly spaced, every two ligaments define a ligament group, four ligament groups are evenly spaced along the circumference on the pitch circle, the first ends of two ligaments in the ligament group extend toward the pitch circle and intersect perpendicularly, and the second ends are tangentially connected to the pitch circle at two quadrant points of the pitch circle, wherein the centers of the pitch circles of the three backhanded units coincide and are perpendicularly intersected in pairs and connected at the quadrant points; Each of the backhanded units is split into two basic units, which include a pitch circle and four ligaments. The ligaments of the basic unit are tangentially connected to the quadrant points of the pitch circle of the basic unit, and the ligaments of the basic unit extend in the counterclockwise or clockwise direction at the same time. The extension directions of two adjacent ligaments of the basic unit are perpendicular. When the basic units are combined into the backhanded unit, the pitch circles of two mirror-symmetrical basic units overlap, and the quadrant points of the two pitch circles overlap, and the ligaments of the basic unit intersect perpendicularly to form the backhanded unit.

2. The reverse chiral filling structure according to claim 1, characterized in that: The reverse chiral filling structure is made of a hollow tube.

3. The reverse chiral filling structure according to claim 2, characterized in that: The hollow tube is a square tube.

4. The reverse chiral filling structure according to claim 2 or 3, characterized in that: The wall thickness of the hollow tube is 0.1 mm.

5. An automobile anti-collision beam, suitable for installation at the front end of an automobile, comprising: A shell surrounding and defining a filling space; The invention is characterized in that: it also includes a plurality of reverse-handed filling structures according to any one of claims 1 to 4, wherein an array of the reverse-handed filling structures is filled in the filling space, two adjacent reverse-handed filling structures are connected to the first end of the ligament, wherein the connected ligaments are collinear, and one of the pitch circles of the reverse-handed filling structures is perpendicular to the forward direction of the vehicle; The array's reverse-handed filling structure is integrally formed by 3D printing technology; The outer shell includes a structural shell plate, the structural shell plate includes a front shell plate and a rear shell plate arranged at intervals along the forward direction of the automobile, the rear shell plate includes two connecting plates arranged at intervals, the connecting plates are used to connect to the automobile, the rear shell plate also includes a rear shell inner plate connected between the two connecting plates, the rear shell plate also includes a rear shell outer plate connected to the connecting plate and one side of the structural shell, the structural shell plate also includes a side shell plate connected between the front shell plate and the rear shell plate, the side shell plate, the front shell plate and the rear shell plate together surround and define the filling space, the connecting plate is provided with a plurality of connecting holes, the automobile anti-collision beam is installed on the automobile through the connecting holes through bolts and other components; The front shell plate is arc-shaped and bends toward the forward direction. The front shell plate is combined with the backhand filling structure. When the front shell plate is impacted, the impact force is dispersed to both sides of the automobile anti-collision beam. The rear shell outer plate is arc-shaped and bends toward the front shell plate, wherein the wall thickness at both ends of the rear shell outer plate gradually increases toward the middle part of the rear shell plate; the rear shell inner plate includes two arc-shaped inner plates, which are bent toward the front shell plate, one end of the arc-shaped inner plate is connected to the connecting plate, and the other end is connected to another arc-shaped inner plate, wherein the wall thickness at both ends of the arc-shaped inner plate gradually increases toward the middle part of the arc-shaped inner plate; the outer shell also includes a carbon fiber thin-walled outer layer coated on the outside of the structural shell plate, and the carbon fiber thin-walled outer layer includes four overlapping layers of carbon fiber reinforced composite materials with different fiber ply directions.

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