A collision energy absorption box

Abstract

The present invention provides a collision energy absorbing box, comprising an upper flange, a composite energy absorber and a lower flange arranged in sequence from top to bottom; the composite energy absorber comprises a mixed cross-section corrugated pipe and a three-level honeycomb core arranged inside the mixed cross-section corrugated pipe; the three-level honeycomb core is sequentially provided with a first-level honeycomb core, a second-level honeycomb core and a third-level honeycomb core from top to bottom; the first-level honeycomb core, the second-level honeycomb core and the third-level honeycomb core are coaxially arranged; the first-level honeycomb core and the second-level honeycomb core are formed by honeycomb units spliced ​​together; the honeycomb unit comprises a plurality of origami units from top to bottom, and the origami units are sequentially stacked from top to bottom to form the honeycomb unit; the honeycomb unit has six side portions, and the honeycomb units are spliced ​​together by overlapping the side portions. The application of this technical solution can realize a collision energy absorbing box with a simple structure that can adapt to multi-angle impacts.

Description

Technical Field

[0001] The invention relates to the field of automobile energy absorption devices, in particular to a collision energy absorption box. Background Art

[0002] In recent years, with the continuous increase in the number of cars, traffic accidents have occurred frequently, which has seriously threatened the lives and safety of the people and brought immeasurable property losses. The car energy absorption box is between the anti-collision steel beam and the longitudinal beam of the vehicle body. In the event of a collision, the energy absorption box can collapse and absorb energy, so that it can absorb part of the impact force, thereby achieving the effect of protecting the lives and safety of passengers in the car. In the event of a minor collision, the anti-collision steel beam can protect the parts on the body, which can reduce the maintenance cost of the owner after the accident. As a protective device installed on the front longitudinal beam of a motor vehicle, the energy absorption box can dissipate a large amount of impact energy when a motor vehicle collides, thereby providing strong and effective protection for pedestrians and passengers, which is a strong guarantee for the life safety of pedestrians and passengers. The car energy absorption box is an important energy absorption device in the car bumper system. It is installed between the crossbeam and the longitudinal beam of the frame and exists as a low-speed safety protection system. Due to different design and manufacturing concepts, various styles of energy absorption box devices have appeared on the market, which directly leads to the high and low ability of the energy absorption box to absorb impact energy; the cross-sectional shape of the car energy absorption box has a direct relationship with the collision energy absorption characteristics. The energy absorption effect, collision force and compression deformation effect are very different under different cross-sectional shapes. The existing energy absorption box structure is mostly a single thin-walled structure, which cannot provide effective and reliable protection; the energy absorption box in the prior art is generally made of foam, generally using PS foam material, because it is a foam material, it is easy to break after the force of the collision; therefore, it is of great practical significance to design an energy absorption box with excellent collision resistance. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a collision energy absorption box that can overcome the problems of unstable energy absorption, low energy absorption efficiency, and poor adaptability to multi-angle impacts of traditional energy absorption boxes; to achieve a collision energy absorption box with a simple structure that can adapt to multi-angle impacts, so as to improve the protection of pedestrians and vehicle occupants during a collision, thereby effectively ensuring the safety of people's lives and property.

[0004] In order to solve the above technical problems, the present invention provides a collision energy absorption box, comprising an upper flange, a composite energy absorber and a lower flange arranged in sequence from top to bottom; the composite energy absorber comprises a mixed cross-section corrugated tube and a three-level honeycomb core arranged inside the mixed cross-section corrugated tube; the three-level honeycomb core is sequentially provided with a first-level honeycomb core, a second-level honeycomb core and a third-level honeycomb core from top to bottom; the first-level honeycomb core, the second-level honeycomb core and the third-level honeycomb core are all coaxially arranged; the first-level honeycomb core and the second-level honeycomb core are formed by honeycomb units spliced ​​together; the honeycomb unit comprises a plurality of origami units from top to bottom, and the origami units are sequentially stacked from top to bottom to form the honeycomb unit; the honeycomb unit has six side portions, and the honeycomb units are spliced ​​by overlapping the side portions.

[0005] In a preferred embodiment, the origami unit is formed by six planes connected end to end to form a ring-shaped body with six sides; the side surfaces are spaced at a certain angle.

[0006] In a preferred embodiment, the side surfaces of the origami units are respectively connected to the side surfaces of the upper and lower origami units; the side surfaces connected to each other between the adjacent upper and lower origami units are also spaced at a certain angle; the side surfaces between two origami units separated by an origami unit are arranged in the same direction; so that the side portions form regularly bent side portions.

[0007] In a preferred embodiment, there are 4 to 7 paper folding units.

[0008] In a preferred embodiment, the third-level honeycomb inner core includes a plurality of mutually connected polygonal columns; the side surfaces of the polygonal columns are overlapped and connected to each other.

[0009] In a preferred embodiment, the polygonal prism is specifically a hexagonal prism.

[0010] In a preferred embodiment, an aramid reinforcement tube is further provided inside the three-level honeycomb core.

[0011] In a preferred embodiment, one end of the mixed-section corrugated tube is specifically a circular end, and its cross-section is specifically a circle; the other end of the mixed-section corrugated tube is specifically an octagonal end, and its cross-section is specifically an octagon; the circular end extends and diverges a corrugated surface in a direction close to the octagonal end; the octagonal end extends and diverges a spiral induction groove in a direction close to the circular end.

[0012] In a preferred embodiment, polyurethane foam is further filled between the mixed cross-section corrugated tube and the three-stage honeycomb inner core and between the three-stage honeycomb inner core and the aramid reinforced tube.

[0013] In a preferred embodiment, a frustum is extended from one end of the lower flange facing the hybrid energy absorber, and the frustum extends into the hybrid energy absorber.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0015] 1. Effectively reduce peak collision force and protect the safety of pedestrians and passengers. The divergent corrugated surface, spiral induction groove and origami mechanism of the three-level honeycomb inner core adopted by the mixed cross-section corrugated tube in the present invention can effectively induce the deformation of the energy absorption box, thereby reducing the peak collision force.

[0016] 2. Achieve progressive energy absorption and step-by-step energy absorption. In the present invention, the mixed-section corrugated tube adopts a divergent corrugated surface to transition from the octagonal end to the circular end. The amplitude of the corrugated surface gradually decreases from top to bottom. As the collision progresses, the absorbed energy gradually increases. Compared with the traditional uniform corrugations, it can better meet the needs of actual impact energy dissipation. In addition, the preset folds of the origami honeycombs in the first-level honeycomb core and the second-level honeycomb core in the three-level honeycomb core gradually increase, so that the energy dissipation increases step by step. During a high-speed collision, the effect of progressive energy absorption and step-by-step energy absorption can greatly reduce the damage caused by the impact.

[0017] 3. Good structural stability and strong adaptability to multi-angle impacts. The mixed-section corrugated pipe of the present invention adopts a mixed section, which has good resistance to lateral impact compared to a single section. The divergent curved surface corrugation can achieve stronger structural stability compared to the uniform corrugated structure. The third-pole honeycomb core at the bottom of the three-level honeycomb core has a high structural strength. It absorbs a lot of energy in the final stage of the impact while also improving the impact adaptability of the honeycomb at different angles. The aramid reinforced tube embedded in the three-layer honeycomb core further strengthens the ability of the energy absorption box to resist instability.

[0018] 4. High energy absorption, effectively ensuring energy absorption efficiency. The circular port side of the mixed-section corrugated pipe adopts a spiral induction groove, which causes the fiber outer tube to spirally tear and prolong the deformation path, thereby increasing the total energy absorption. The internal three-level honeycomb core brings huge energy absorption through a progressive folding deformation mode. The polyurethane foam itself has good buffering and energy absorption effects. The combination of the three-level honeycomb core and the mixed-section corrugated pipe is used as a mold for foaming, which can make the torn fiber filaments of the mixed-section corrugated pipe and the aramid reinforced pipe, and the deformed folded petals of the hierarchical honeycomb layer embedded in the polyurethane foam, thereby enhancing the interaction of the composite energy absorber, thereby enhancing its energy absorption effect. The aramid reinforced tube embedded in the three-level honeycomb core can provide effective energy absorption conduction, so that the composite energy absorber can complete the energy absorption process in a shorter time, thereby improving the energy absorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the overall structure of a collision energy absorption box in a preferred embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of an explosion of a collision energy absorption box in a preferred embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a composite energy absorber of a collision energy absorbing box in a preferred embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a mixed-section corrugated tube of a collision energy absorption box in a preferred embodiment of the present invention;

[0023] Figure 5 It is a schematic structural diagram of a three-level honeycomb core of a collision energy absorption box in a preferred embodiment of the present invention;

[0024] Figure 6 A schematic diagram of an origami unit of a kogame folded honeycomb unit of a collision energy absorption box in a preferred embodiment of the present invention;

[0025] Figure 7 It is a transverse cross-sectional schematic diagram of a composite energy absorber of a collision energy absorbing box in a preferred embodiment of the present invention;

[0026] Figure 8 It is a longitudinal cross-sectional schematic diagram of a composite energy absorber of a collision energy absorbing box in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] A collision energy absorption box, reference Figures 1 to 7 , including an upper flange 101, a composite energy absorber 102 and a lower flange 100 arranged in sequence from top to bottom; a truncated cone is extended from one end of the lower flange 100 facing the hybrid energy absorber, and the truncated cone extends into the hybrid energy absorber. The composite energy absorber 102 includes a hybrid cross-section corrugated tube 201 and a three-level honeycomb core 202 arranged inside the hybrid cross-section corrugated tube 201; the three-level honeycomb core 202 is sequentially provided with a first-level honeycomb core 401, a second-level honeycomb core 402 and a third-level honeycomb core 403 from top to bottom; the first-level honeycomb core 401, the second-level honeycomb core 402 and the third-level honeycomb core 403 are all coaxially arranged; the first-level honeycomb core 401 and the second-level honeycomb core 402 are formed by honeycomb units spliced ​​together; the honeycomb unit includes a plurality of origami units from top to bottom, and the origami units are sequentially stacked from top to bottom to form the honeycomb unit; the honeycomb unit has six side portions, and the honeycomb units are spliced ​​by overlapping the side portions.

[0029] In the present embodiment, the origami unit is formed by six planes connected head to tail to form an annular body with six sides; the sides are spaced at a certain angle. Specifically, the sides of the origami unit are respectively connected to the sides of the upper and lower origami units; the sides connected to each other between the adjacent upper and lower origami units are also spaced at a certain angle; the sides between two origami units separated by an origami unit are arranged in the same direction; so that the side portions form regularly bent side portions. In the present embodiment, 4 to 7 origami units are provided. When the honeycomb unit is the first honeycomb unit 4011, 4 origami units are provided; when the honeycomb unit is the second honeycomb unit 4021, 7 origami units are provided. The first-level honeycomb core 401 and the second-level honeycomb core 402 are kagome-shaped origami honeycombs, and the third-level honeycomb core 403 is a kagome honeycomb. The wall surface of the origami honeycomb is mainly composed of Figure 5 The folding wave number n shown is controlled by origami units. The preset folding wave number n of the first-level honeycomb core 401 and the second-level honeycomb core 402 increases successively from 4 to 7. It should be noted that the origami honeycomb can effectively reduce the initial peak force of the collision, and the honeycomb with more preset folding wave numbers has higher energy absorption. Different combinations can achieve the purpose of customized energy absorption. The wall surface of the third-level honeycomb core 403 is a straight surface, which is placed at the bottom (third layer) to avoid the main impact stage. Such an arrangement design can not only reduce the peak force of the collision, but also enhance the structural rigidity of the energy absorption box.

[0030] This arrangement makes the energy absorption box have good structural stability and strong adaptability to multi-angle impacts. The mixed cross-section corrugated tube 201 in the present invention adopts a mixed cross-section, which has good resistance to lateral impact compared to a single cross-section. The divergent curved surface corrugation can achieve stronger structural stability compared to the uniform corrugated structure. The kagome honeycomb at the bottom of the three-level honeycomb inner core 202 has a high structural strength. It brings a large amount of energy absorption to the final stage of the impact while also improving the impact adaptability of the honeycomb at different angles. The aramid reinforced tube 601 embedded in the three-layer honeycomb core further enhances the ability of the energy absorption box to resist instability.

[0031] In this embodiment, the third-level honeycomb inner core 403 includes a plurality of mutually spliced ​​polygonal columns, and the sides of the polygonal columns overlap and splice with each other. In this embodiment, the polygonal columns are specifically hexagonal columns.

[0032] Specifically, an aramid reinforced tube 601 is also provided inside the three-level honeycomb inner core 202. Polyurethane foam 602 is also filled between the mixed cross-section corrugated tube 201 and the three-level honeycomb inner core 202, and between the three-level honeycomb inner core and the aramid reinforced tube 601. The embedded tube method is conducive to improving the energy absorption efficiency, so that the energy absorber can complete energy absorption in a shorter time. In addition, polyurethane foam 602 is provided between the mixed cross-section corrugated tube 201 and the three-level honeycomb inner core 202, and between the three-level honeycomb inner core 202 and the aramid reinforced tube 601. It should be noted that the polyurethane foam 602 is foamed by using the combination of the mixed cross-section corrugated tube 201 and the three-level honeycomb inner core 202 as a mold. This method can make the torn fiber filaments of the mixed cross-section corrugated tube 201 and the aramid reinforced tube 601, and the deformed folded petals of the three-level honeycomb core embedded in the polyurethane foam 602, thereby enhancing the interaction of the composite energy absorber 102, thereby enhancing its energy absorption effect.

[0033] Specifically, one end of the mixed cross-section corrugated tube 201 is a circular end 304, and its cross-section is a circle; the other end of the mixed cross-section corrugated tube 201 is an octagonal end 303, and its cross-section is an octagon; the circular end 304 extends and diverges a corrugated surface 301 in the direction close to the octagonal end 303; the octagonal end 303 extends and diverges a spiral induction groove 302 in the direction close to the circular end 304.

[0034] The composite energy absorber 102 is mainly composed of a mixed cross-section corrugated tube 201 and a three-level honeycomb inner core 202, and plays a major role in absorbing energy. The structure of the mixed cross-section corrugated tube 201 is as follows: Figure 3As shown, it is made of carbon fiber, with an octagonal end 303 at one end and a circular end 304 at the other end, which is transitioned by a divergent corrugated surface 301. The mixed cross-section design with an octagonal end 303 at one end and a circular end 304 at the other end is conducive to improving the energy absorption box's ability to resist lateral impact. The circular end 304 is provided with a spiral induction groove 302, which is triggered by the lower flange 100, causing the mixed cross-section corrugated tube 201 to undergo spiral tearing, increasing its effective stroke of energy absorption, thereby increasing the total energy absorption of the energy absorption box. The octagonal end 303 is provided with a divergent corrugated surface 301, which can significantly reduce the initial peak force of the collision and achieve the purpose of progressive energy absorption. Such a setting can effectively reduce the peak collision force and protect the safety of pedestrians and passengers. The divergent surface, spiral induction groove 302 and origami mechanism of the three-level honeycomb inner core 202 used in the mixed cross-section corrugated tube 201 of the present invention can effectively induce the deformation of the energy absorption box, thereby reducing the peak collision force. Progressive energy absorption and step-by-step energy absorption are achieved. In the present invention, the mixed cross-section bellows 201 uses a divergent curved surface transition from the octagonal end 303 to the circular end 304. The amplitude of the corrugation gradually decreases from top to bottom. As the collision progresses, the absorbed energy gradually increases. Compared with the traditional uniform corrugation, it can better meet the needs of actual impact energy dissipation. In addition, the preset folds of the origami honeycomb in the three-level honeycomb core 202 gradually increase, so that the energy dissipation is gradually improved. In the process of high-speed collision, the effect of gradual energy absorption and step-by-step energy absorption can greatly reduce the damage caused by the impact.

[0035] The spiral induction groove 302 is used on the mouth side of the circular end 304 of the mixed cross-section corrugated tube 201, which promotes spiral tearing of the fiber outer tube to extend the deformation path, thereby increasing the total energy absorption. The internal three-level honeycomb core 202 brings huge energy absorption through a progressive folding deformation mode. The polyurethane foam 602 itself has good buffering and energy absorption effects. The combination of the three-level honeycomb core 202 and the mixed cross-section corrugated tube 201 is used as a mold for foaming, which can make the torn fiber filaments of the mixed cross-section corrugated tube 201 and the aramid reinforced tube 601, and the folded petals of the deformed hierarchical honeycomb layer embedded in the polyurethane foam 602, thereby enhancing the interaction of the composite energy absorber 102, thereby enhancing its energy absorption effect. The aramid reinforced tube 601 embedded in the three-level honeycomb core 202 can provide effective energy absorption conduction, so that the composite energy absorber 102 can complete the energy absorption process in a shorter time, thereby improving the energy absorption efficiency.

[0036] 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 collision energy absorption box, characterized in that: It comprises an upper flange, a composite energy absorber and a lower flange which are sequentially arranged from top to bottom; the composite energy absorber comprises a mixed cross-section corrugated pipe and a three-level honeycomb core arranged inside the mixed cross-section corrugated pipe; the three-level honeycomb core comprises a first-level honeycomb core, a second-level honeycomb core and a third-level honeycomb core in sequence from top to bottom; the first-level honeycomb core, the second-level honeycomb core and the third-level honeycomb core are coaxially arranged; the first-level honeycomb core and the second-level honeycomb core are formed by honeycomb units spliced ​​together; the honeycomb unit comprises a plurality of origami units from top to bottom, and the origami units are sequentially stacked from top to bottom to form the honeycomb unit; the honeycomb unit has six side portions, and the honeycomb units are spliced ​​together by overlapping the side portions; The origami unit is composed of six planes connected end to end to form a ring with six sides; the sides are spaced at a certain angle. The side surfaces of the origami units are respectively connected to the side surfaces of the upper and lower origami units; the side surfaces connected to each other between the adjacent upper and lower origami units are also spaced at a certain angle; the side surfaces between the two origami units separated by an origami unit are arranged in the same direction; so that the side portions form regularly bent side portions; The number of origami units of the honeycomb units of the first-stage honeycomb inner core and the second-stage honeycomb inner core increases successively so that the preset folding wave number n of the honeycomb units increases successively; The third-level honeycomb inner core comprises a plurality of mutually spliced ​​polygonal columns; the side surfaces of the polygonal columns are overlapped and spliced ​​with each other, and the wall surface of the third-level honeycomb inner core is a straight surface.

2. The collision energy absorption box according to claim 1, characterized in that: There are 4 to 7 origami units.

3. The crash energy absorption box according to claim 1, characterized in that: The polygonal column is specifically a hexagonal column.

4. The crash energy absorbing box according to claim 1, characterized in that: An aramid reinforcement tube is also arranged inside the three-level honeycomb inner core.

5. The crash energy absorbing box according to claim 4, characterized in that: One end of the mixed-section corrugated pipe is specifically a circular end, and its cross-section is specifically a circle; the other end of the mixed-section corrugated pipe is specifically an octagonal end, and its cross-section is specifically an octagon; the circular end extends and diverges a corrugated surface in a direction close to the octagonal end; the octagonal end extends and diverges a spiral induction groove in a direction close to the circular end.

6. The crash energy absorbing box according to claim 5, characterized in that: Polyurethane foam is also filled between the mixed cross-section corrugated tube and the three-stage honeycomb inner core and between the three-stage honeycomb inner core and the aramid reinforced tube.

7. The crash energy absorbing box according to claim 6, characterized in that: The composite energy absorber is located between the upper flange and the lower flange. A truncated cone is extended from one end of the lower flange facing the composite energy absorber, and the truncated cone extends into the composite energy absorber.

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