Chiral structure, buffer energy absorption structure, anti-collision energy absorption structure and automobile anti-collision beam

Abstract

The present invention provides a chiral structure, a buffering energy absorption structure, an anti-collision energy absorption structure and an automobile anti-collision beam. The chiral structure comprises: three chiral units, the chiral unit comprises a pitch circle and eight ligaments, the pitch circle comprises four quadrant points evenly spaced, every two ligaments define a ligament group, the first ends of two ligaments in the ligament group intersect to define an intersection point, the second ends are spaced apart and connected tangentially to the pitch circle, wherein the center of the pitch circle, the intersection point and one of the quadrant points of the pitch circle are collinear, the second ends of the ligaments of two adjacent ligament groups intersect, wherein the centers of the pitch circles of the three chiral units overlap and are perpendicularly intersected in pairs at the quadrant points and intersection points. The application of this technical solution can achieve a chiral structure with high compressive strength and good energy absorption effect, which is beneficial to improving the buffering effect, the buffering energy absorption structure, the anti-collision energy absorption structure and the automobile anti-collision beam.

Description

Technical Field

[0001] The invention relates to the field of anti-collision energy absorption, and in particular to a chiral structure, a buffer energy absorption structure, an anti-collision energy absorption 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 front anti-collision beam assembly is one of the main assemblies for collision energy absorption. The energy absorption box in the anti-collision beam assembly absorbs the collision energy by crushing and deforming itself during a collision, and is one of the important components of the anti-collision beam assembly.

[0003] In the past, the energy absorption box structure of the anti-collision beam of passenger cars was mostly a box-shaped structure with a polygonal cross-section. Two box-shaped structures with the same or symmetrical structure were distributed on both sides of the anti-collision beam. The box-shaped structure was then connected to the anti-collision beam to form an anti-collision beam assembly. The energy absorption box absorbs collision energy by its own collapse and deformation, and this single energy absorption box can only control the collapse and deformation by designing its own energy absorption ribs and cross-sectional shape. In medium and high-speed collisions, the energy absorption is weak and the collapse form is unstable. Neither the longitudinal beam of the vehicle body nor the occupants in the vehicle can be well protected. In addition, no matter what kind of collision occurs, the energy absorption box will be partially deformed and must be replaced during maintenance, which increases 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 provide a chiral structure, a buffering energy absorbing structure, an anti-collision energy absorbing structure and an automobile anti-collision beam with high compressive strength and good energy absorption effect, which is beneficial to improving the buffering effect.

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

[0006] Three chiral units, the chiral units include a pitch circle and eight ligaments, the pitch circle includes four quadrant points evenly spaced, every two ligaments define a ligament group, the first ends of two ligaments in the ligament group intersect to define an intersection point, the second ends are spaced apart and tangentially connected to the pitch circle, wherein the center of the pitch circle, the intersection point and one of the quadrant points of the pitch circle are collinear, the second ends of the ligaments of two adjacent ligament groups intersect, wherein the centers of the pitch circles of the three chiral units coincide and are perpendicularly intersected in pairs at the quadrant points and the intersection points.

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

[0008] The present invention provides a buffer energy absorption structure using the chiral structure, including: a plurality of spacer plates arranged in sequence along a first direction, a plurality of chiral structures arranged in an array are connected between two adjacent spacer plates, and two adjacent chiral structures are connected through the intersection point.

[0009] Preferably, one of the pitch circles of the chiral structure is parallel to the spacer.

[0010] Preferably, the spacing distances between the plurality of spacing plates vary in a gradient manner along the first direction, and the thicknesses of the plurality of spacing plates vary in a gradient manner along the first direction.

[0011] Preferably, the spacing distance between the plurality of spacing plates gradually increases along the first direction, and the thickness of the plurality of spacing plates gradually increases along the first direction.

[0012] Preferably, the number of array rows of the chiral structures between two adjacent spacers changes gradually along the first direction.

[0013] Preferably, the number of array rows of the chiral structures between two adjacent spacers gradually increases along the first direction.

[0014] Preferably, the pitch circle diameter, ligament length and ligament thickness of the chiral structures in the same array are the same, and the pitch circle diameter, ligament length and ligament thickness of the chiral structures in different arrays arranged sequentially along the first direction respectively show gradient changes.

[0015] Preferably, the pitch circle diameters, ligament lengths and ligament thicknesses of the chiral structures of different arrays sequentially arranged along the first direction gradually decrease along the first direction.

[0016] The present invention provides an anti-collision energy absorption structure, which uses the buffer energy absorption structure, including: a connecting cylinder and two connecting plates, the connecting cylinder is sleeved outside the buffer energy absorption structure, and the connecting plate connecting covers are arranged at both ends of the connecting cylinder and abut against the spacer plate.

[0017] Preferably, a plurality of induction annular grooves extend from the peripheral wall of the connecting cylinder, and the induction annular grooves are arranged at intervals along the first direction.

[0018] Preferably, a plurality of induction ring grooves are adjacent to each other to define an induction ring groove group, and the plurality of induction ring groove groups are arranged at intervals along the first direction, and the interval distance of the induction ring groove groups changes gradually along the first direction.

[0019] Preferably, the width, depth and spacing distance of the induction ring grooves in each of the induction ring groove groups change gradiently along the first direction.

[0020] The invention provides an automobile anti-collision beam, which uses the anti-collision energy absorption structure.

[0021] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0022] 1. Good anti-vibration and buffering effects. The gradient structure of the induced ring groove has good energy absorption characteristics. When the impact energy passes through the anti-collision beam and the connecting plate of the car and is absorbed by the anti-collision energy absorption structure layer by layer, the impact load is greatly reduced, making the anti-collision energy absorption structure have good buffering effect and anti-collision performance;

[0023] 2. The chiral structure is light and has good impact resistance. The anti-collision energy absorption structure uses the chiral structure for internal gradient filling, which makes the anti-collision energy absorption structure improve the anti-collision strength while significantly reducing the overall mass (increasing specific energy absorption), which will be beneficial to the energy conservation and emission reduction of the vehicle and the improvement of the vehicle's dynamic performance;

[0024] 3. Good buffering effect and stable energy absorption process

[0025] The core of the anti-collision energy absorption structure is a gradient-set chiral structure. This chiral structure is an isotropic tensile expansion structure with light weight, high specific strength, high specific modulus and excellent pressure-bearing performance. It can effectively ensure the stability of energy absorption while increasing the total energy absorption. The gradient-set chiral structure is used to dissipate energy, so that energy is dissipated quickly during a collision, which is beneficial to the protection of the internal structure of the bus and the safety of the passengers.

[0026] 4. Stable deformation and controllable failure results

[0027] The anti-collision energy-absorbing structure is prepared as a whole through 3D printing, which is conducive to improving the overall mechanical properties of the anti-collision structure. The connecting cylinder is conducive to guiding the deformation and collapse direction and controlling the failure mode of the energy-absorbing box, so that the failure result of the anti-collision energy-absorbing structure is controllable, which is conducive to the protection of the internal structure of the bus and thus ensures the safety of the passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of a chiral structure formed by vertically connecting three chiral units in pairs in a preferred embodiment of the present invention;

[0029] Figure 2 is a plan view of a chiral unit in a preferred embodiment of the present invention;

[0030] Figure 3 is a three-dimensional schematic diagram of two chiral units vertically connected in a preferred embodiment of the present invention;

[0031] Figure 4 A schematic plan view of a basic unit in a preferred embodiment of the present invention;

[0032] Figure 5 It is a three-dimensional schematic diagram of the anti-collision energy absorption structure in a preferred embodiment of the present invention;

[0033] Figure 6It is a cross-sectional schematic diagram of the anti-collision energy absorption structure in the preferred embodiment of the present invention, showing the buffer energy absorption structure. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] 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.

[0036] 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.

[0037] See also Figure 1-4 A chiral structure 100 comprises: three chiral units 10, wherein the chiral units 10 comprise a pitch circle 11 and eight ligaments 12, wherein the pitch circle 11 comprises four quadrant points 111 evenly spaced, wherein every two ligaments 12 define a ligament group 121, wherein the first ends 123 of two ligaments 12 in the ligament group 121 intersect to define an intersection point 122, and the second ends 124 are spaced apart and tangentially connected to the pitch circle 11, wherein the center of the pitch circle 11, the intersection point 122 and one of the quadrant points 111 of the pitch circle 11 are collinear, and the second ends 124 of the ligaments 12 of two adjacent ligament groups 121 intersect, wherein the centers of the pitch circles 11 of the three chiral units 10 coincide and are perpendicularly intersected in pairs at the quadrant points 111 and the intersection points 122.

[0038] For details, see Figure 2 and 4 Each chiral unit 10 can be split into two basic units 13, each 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, and the ligaments 12 of the basic unit 13 extend counterclockwise or clockwise at the same time. When the basic units 13 are combined into a chiral unit 10, 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 ends of the ligaments 12 of the basic unit 13 overlap to form the chiral unit 10.

[0039] Analyzing from the perspective of the force applied to 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 ligaments 12 of the basic unit 13, causing the pitch circle 11 to have a tendency to rotate. At the same time, the ligaments 12 of the basic unit 13 are rolled up to form a negative Poisson's ratio state in which the compression cross section is reduced and the tension cross section is increased. Because the chiral unit 10 has two mirror-symmetrical basic units 13, the pitch circle 11 of the chiral unit 10 receives counterclockwise and clockwise rotation tendencies respectively, so the rotation tendencies of the pitch circle 11 of the chiral unit 10 offset each other, and the force on the pitch circle 11 of the chiral unit 10 is more stable. In addition, because the chiral structure 100 has three chiral units 10 and the centers of the pitch circles 11 of the three chiral units 10 coincide and are perpendicularly intersected and connected at the quadrant point 111 and the intersection point 122, when the chiral structure 100 is impacted, the three pitch circles 11 of the chiral structure 100 are not easily dislocated or deformed, and the overall structure is more stable, so that its bearing capacity and energy absorption capacity are stronger.

[0040] In this embodiment, the chiral units 10 are all made of hollow tubes. More specifically, the hollow tubes are hollow square tubes or hollow circular tubes, and the wall thickness of the hollow tubes is 0.1. The chiral structure 100 is made by 3D printing technology. The chiral structure 100 has the characteristics of light weight, high specific strength, and high specific modulus. The chiral structure 100 also has excellent pressure-bearing performance and isotropic expansion characteristics, which can effectively ensure the stability of energy absorption while increasing the total energy absorption.

[0041] See also Figure 6 , showing a buffer energy absorption structure 200, using the chiral structure 100, the buffer energy absorption structure 200 includes: a plurality of spacers 20 arranged in sequence along the first direction 400, a plurality of chiral structures 100 arranged in an array are connected between two adjacent spacers 20, and two adjacent chiral structures 100 are connected through the intersection 122, and one of the pitch circles 11 of the chiral structure 100 is parallel to the spacer 20.

[0042] The spacing distances between the plurality of spacers 20 vary gradually along the first direction 400, and the thickness T of the plurality of spacers 20 varies gradually along the first direction 400. Specifically, the spacing distances between the plurality of spacers 20 gradually increase along the first direction 400, and the thickness T of the plurality of spacers 20 gradually increases along the first direction 400. In this embodiment, four spacers 20 are provided, and the spacers 20 are aluminum foam spacers. The spacing distances between the spacers 20 are affected by the size values ​​of the chiral structure 100, which will be specifically mentioned below, and the thickness T of the spacers 20 along the first direction 400 is 1 mm, 3 mm, 5 mm, and 7 mm, respectively. In some simple substitutions, it can also be other values, such as 1 mm, 2 mm, 3 mm, and 4 mm.

[0043] In this embodiment, the number of array rows of the chiral structure 100 between two adjacent spacers 20 changes gradually along the first direction 400. Specifically, the number of array rows of the chiral structure 100 between two adjacent spacers 20 gradually increases along the first direction 400. Because there are four spacers 20, the four spacers 20 sequentially separate the first array space 21, the second array space 22 and the third array space 23 along the first direction 400. In the first array space 21, the number of array rows of the chiral structure 100 is 1, in the second array space 22, the number of array rows of the chiral structure 100 is 2, and in the third array space 23, the number of array rows of the chiral structure 100 is 3.

[0044] In this embodiment, the pitch circle 11 diameter R, the ligament 12 length L, and the ligament 12 thickness T of the chiral structures 100 in the same array are the same, and the pitch circle 11 diameter R, the ligament 12 length L, and the ligament 12 thickness T of the chiral structures 100 in different arrays sequentially arranged along the first direction 400 are gradient-changed. In this embodiment, the pitch circle 11 diameter R, the ligament 12 length L, and the ligament 12 thickness T of the chiral structures 100 in different arrays sequentially arranged along the first direction 400 are gradually reduced along the first direction 400.

[0045] Specifically, in the first array space 21, the diameter R of the pitch circle 11 of the chiral structure 100 is 8 mm, the length L of the ligament 12 is 20 mm, and the thickness T of the ligament 12 is 3 mm. In the second array space 22, the diameter R of the pitch circle 11 of the chiral structure 100 is 7 mm, the length L of the ligament 12 is 15 mm, and the thickness T of the ligament 12 is 2 mm. In the third array space 23, the diameter R of the pitch circle 11 of the chiral structure 100 is 6 mm, the length L of the ligament 12 is 10 mm, and the thickness T of the ligament 12 is 1 mm. It should be noted that the thickness T of the ligament 12 refers to the radial dimension of the ligament 12. For example, when the chiral structure 100 is made of a hollow square tube, the thickness T of the ligament 12 is equal to the side length of the hollow square tube. When the chiral structure 100 is made of a hollow circular tube, the thickness T of the ligament 12 is equal to the diameter R of the hollow circular tube.

[0046] See also Figure 5-6 , showing an anti-collision energy absorption structure 300, which can be applied to the anti-collision energy absorption structure 300 of the automobile, and the anti-collision energy absorption structure 300 uses the buffer energy absorption structure 200, and the anti-collision energy absorption structure 300 includes: a connecting cylinder 310 and two connecting plates 320, the connecting cylinder 310 is sleeved outside the buffer energy absorption structure 200, and the connecting plate 320 is connected to the two ends of the connecting cylinder 310 and abuts the spacer plate 20. The peripheral wall of the connecting cylinder 310 extends with a plurality of induction ring grooves 311, and the induction ring grooves 311 are arranged at intervals along the first direction 400. In this embodiment, the cross section of the induction ring groove 311 is triangular.

[0047] A plurality of induction ring grooves 311 are adjacent to define an induction ring groove group 312, and the plurality of induction ring groove groups 312 are arranged at intervals along the first direction 400, and the interval distance of the induction ring groove groups 312 changes gradually along the first direction 400. The width, depth and interval distance of the induction ring grooves 311 in each of the induction ring groove groups 312 change gradually along the first direction 400.

[0048] Specifically, the connecting cylinder 310 is provided with four induction ring groove groups 312 at intervals along the first direction 400, the number of induction ring grooves 311 in each induction ring groove group 312 is 3, 4, 5 and 6 respectively, and the interval distance of each induction ring groove group 312 is 12 mm, 10 mm and 8 mm respectively.

[0049] The widths of the induction ring grooves 311 along the first direction 400 are arranged as follows:

[0050] The first group of induction ring grooves 312: 1.5mm, 2.0mm, 2.5mm;

[0051] The second group of induction ring grooves 312: 1.5mm, 2.0mm, 2.5mm, 3.0mm;

[0052] The third group of induction ring groove group 312: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm;

[0053] The fourth group of induction ring grooves 312: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm.

[0054] The widths of the induction ring grooves 311 along the first direction 400 are arranged as follows:

[0055] The first group of induction ring grooves 312: 1.0mm, 1.5mm, 2.0mm:

[0056] The second group of induction ring groove group 312: 1.0mm, 1.5mm, 2.0mm, 2.5mm:

[0057] The third group of induction ring groove group 312: 1.0mm, 1.5mm, 2.0mm, 2.5mm:

[0058] The fourth group of induction ring grooves 312: 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm.

[0059] The spacing distance of the induction ring grooves 311 along the first direction 400 is arranged as follows:

[0060] The first group of induction ring grooves 312: 3.0mm, 4.0mm

[0061] The second group of induction ring groove group 312: 3.0mm, 4.0mm, 5.0mm,

[0062] The third group of induction ring groove group 312: 3.0mm, 3.5mm, 4.0mm, 4.5mm,

[0063] The fourth group of induction ring grooves 312: 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm.

[0064] The connecting plates 320 are respectively provided with four connecting holes 321 , and the two connecting plates 320 are respectively connected to the anti-collision beam of the automobile and the frame of the automobile through the connecting holes 321 .

[0065] During the impact, the gradient setting of the induced ring groove 311 can make the anti-collision energy absorbing structure 300 absorb the impact energy layer by layer during the collapse process, greatly reducing the impact load, so that the anti-collision energy absorbing structure 300 has good buffering effect and anti-collision performance. The chiral structure 100 in the anti-collision energy absorbing structure 300 can not only improve the anti-collision strength, but also greatly reduce the overall mass of the anti-collision energy absorbing structure 300, which will be beneficial to energy conservation and emission reduction of automobiles and improvement of bus power performance.

[0066] 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 chiral structure, characterized in that: include: Three chiral units, the chiral units include a pitch circle and eight ligaments, the pitch circle includes four quadrant points evenly spaced, every two ligaments define a ligament group, the first ends of two ligaments in the ligament group intersect to define an intersection point, and the second ends are spaced apart and tangentially connected to the pitch circle, wherein the center of the pitch circle, the intersection point and one of the quadrant points of the pitch circle are collinear, and the second ends of the ligaments of two adjacent ligament groups intersect, wherein the centers of the pitch circles of the three chiral units overlap and are perpendicularly intersected and connected at the quadrant points and the intersection points; Each chiral unit can be split into two basic units, and the basic unit includes a pitch circle and four ligaments. The four ligaments of the basic unit are respectively tangentially connected to the quadrant points of the pitch circle of the basic unit, and the four ligaments of the basic unit extend counterclockwise or clockwise at the same time; when the basic units are combined into the chiral unit, the pitch circles of the two mirror-symmetrical basic units overlap, and the quadrant points of the two pitch circles overlap, and the ends of the ligaments of the basic unit overlap to form the chiral unit.

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

3. A buffering energy absorbing structure, using the chiral structure as claimed in claim 1 or 2, characterized in that: include: A plurality of spacer plates are sequentially arranged at intervals along a first direction, a plurality of chiral structures arranged in an array are connected between two adjacent spacer plates, and two adjacent chiral structures are connected via the intersection point.

4. The buffer energy absorption structure according to claim 3, characterized in that: One of the pitch circles of the chiral structure is parallel to the spacer.

5. The buffering energy absorbing structure according to claim 3, characterized in that: The spacing distances between the plurality of spacing plates vary gradually along the first direction, and the thicknesses of the plurality of spacing plates vary gradually along the first direction.

6. The energy absorbing buffer structure according to claim 5, characterized in that: The spacing distances between the plurality of spacing plates gradually increase along the first direction, and the thicknesses of the plurality of spacing plates gradually increase along the first direction.

7. The energy-absorbing buffer structure according to claim 3, characterized in that: The number of array rows of the chiral structures between two adjacent spacers changes gradually along the first direction.

8. The energy absorbing structure according to claim 7, characterized in that: The number of array rows of the chiral structures between two adjacent spacers gradually increases along the first direction.

9. The energy absorbing structure according to claim 3, characterized in that: The pitch circle diameter, ligament length and ligament thickness of the chiral structures in the same array are the same, and the pitch circle diameter, ligament length and ligament thickness of the chiral structures in different arrays arranged sequentially along the first direction respectively show gradient changes.

10. The buffer energy absorption structure according to claim 9, characterized in that: The pitch circle diameters, ligament lengths and ligament thicknesses of the chiral structures of different arrays sequentially arranged along the first direction gradually decrease along the first direction.

11. An anti-collision energy absorption structure, using the buffer energy absorption structure according to any one of claims 3 to 10, characterized in that: include: A connecting cylinder and two connecting plates, wherein the connecting cylinder is sleeved outside the buffer energy absorption structure, and the connecting plate connecting covers are arranged at both ends of the connecting cylinder and abut against the spacer plate; A plurality of induction annular grooves are extended from the peripheral wall of the connecting cylinder, and the induction annular grooves are arranged at intervals along the first direction; A plurality of induction ring grooves are adjacent to each other to define an induction ring groove group, the plurality of induction ring groove groups are arranged at intervals along the first direction, and the interval distance of the induction ring groove groups changes gradually along the first direction; The width, depth and spacing of the induction ring grooves in each of the induction ring groove groups change in a gradient manner along the first direction; The connecting cylinder is provided with four induction ring groove groups at intervals along the first direction, the number of induction ring grooves in each of the induction ring groove groups is 3, 4, 5 and 6 respectively, and the interval distances between each of the induction ring groove groups are 12 mm, 10 mm and 8 mm respectively; The widths of the induction ring grooves along the first direction are arranged as follows: The first group of induction ring grooves 312: 1.5mm, 2.0mm, 2.5mm; The second group of induction ring grooves 312: 1.5mm, 2.0mm, 2.5mm, 3.0mm; The third group of induction ring groove group 312: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm; The fourth group of induction ring groove group 312: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm; The widths of the induction ring grooves 311 along the first direction 400 are arranged as follows: The first group of induction ring grooves 312: 1.0mm, 1.5mm, 2.0mm: The second group of induction ring groove group 312: 1.0mm, 1.5mm, 2.0mm, 2.5mm: The third group of induction ring groove group 312: 1.0mm, 1.5mm, 2.0mm, 2.5mm: The fourth group of induction ring grooves 312: 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm; The spacing distance of the induction ring grooves 311 along the first direction 400 is arranged as follows: The first group of induction ring grooves 312: 3.0mm, 4.0mm The second group of induction ring groove group 312: 3.0mm, 4.0mm, 5.0mm, The third group of induction ring groove group 312: 3.0mm, 3.5mm, 4.0mm, 4.5mm, The fourth group of induction ring grooves 312: 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm; The connecting plates are respectively provided with four connecting holes, and the two connecting plates are respectively connected to the anti-collision beam of the automobile and the automobile frame through the connecting holes.

12. An automobile anti-collision beam, characterized in that: The anti-collision energy absorbing structure as claimed in claim 11 is used.

Images