CN214775746U - Arched energy absorption protection device - Google Patents

Abstract

The utility model belongs to the technical field of safety protection is relevant to an arch energy absorption protector is disclosed. The protection device is a thin-wall pipe fitting and is integrally arched, and comprises straight line parts at two ends and an arc part clamped between the straight line parts, wherein the straight line parts at the two ends are symmetrical relative to the arc part along the tangential direction of the arc part, and when the protection device is subjected to a longitudinal external force, the longitudinal external force is decomposed into component force along the axial direction of the straight line parts, so that the protection device generates sinking, bending and buckling deformation, and the energy is absorbed. Through the utility model discloses, whole domes produce along the structural advantage of linear portion axial force under the make full use of longitudinal load, and the local utilizes linear portion thin wall tubular structure to bear under the axial force with the characteristics that energy absorption capacity is far above transverse load, increases substantially overall structure energy absorption capacity and efficiency under longitudinal load.

Description

Arched energy absorption protection device

Technical Field

The utility model belongs to the technical field of safety protection is relevant, more specifically relates to an arch energy absorption protector.

Background

In the current automobile design, bumper systems installed at the front and the rear of the automobile are usually adopted to ensure that a carriage structure frame is not seriously damaged under low-speed impact load, thereby ensuring the safety of passengers in the automobile and the main structure of the automobile. During a car crash. The energy absorber is capable of absorbing the kinetic energy generated by the impact and converting it irreversibly into plastic deformation energy of the material. In order to absorb the kinetic energy of an impact as much as possible, energy absorbers are often installed on the bumper beam and the vehicle frame rails in current bumper system designs. In some designs, several energy absorbers are also placed side-by-side in the bumper beam in order to further increase the energy absorption capacity of the bumper system. Current bumpers are usually thin-walled straight beams of different cross-sectional forms, or curved beams with a certain curvature, but their centerline profile is usually a circular arc curve or an irregular curve.

An ideal energy absorber needs to have light weight and high energy absorption efficiency. Since the energy absorbing device moves with the structure, the lighter the mass the less energy consumption and pollution. In addition, the lighter the mass, the lower the manufacturing cost. Therefore, the energy absorption device with light weight and high energy absorption efficiency has important significance in the aspects of energy conservation, environmental protection and safety. The traditional thin-wall straight beam structure mainly generates bending deformation when bearing transverse load, and the energy absorption capacity and efficiency of the traditional thin-wall straight beam structure are far lower than those of the traditional thin-wall straight beam structure when bearing axial load.

The automobile bumper is widely made of thin-wall straight beams or circular arc curved beams. For example, patent publication No. CN 109263588A discloses an impact beam assembly having a thin-walled straight beam structure. Patent publication No. CN 106043184A discloses a car body collision energy-absorbing structure, and its front anti-collision beam is a circular arc thin wall beam. The structural form of the thin-walled impact beam itself is not specifically designed to improve the energy absorption performance of the structure under lateral loads. To improve the capacity and efficiency of energy absorbers for thin wall beams under transverse loads, multi-layer bumper structures are used in the design of automobile bumpers. For example, a patent entitled "a multi-layer cushion guide automobile front bumper structure" with patent publication No. CN 107521445 a discloses a multi-layer structure using outer frames, baffles, folded plates, main impact beams, etc. for improving energy absorption capability. The patent entitled "a bumper structure for a vehicle", patent publication No. CN 106379263 a, discloses a gradient multi-cell vehicle energy absorption buffer device that improves energy absorption performance by adding a grill buffer structure between a bumper shock-absorbing beam and a bumper outer panel. The patent name is "a flexible energy-absorbing automobile anti-collision beam", and patent publication No. CN 108749755A, the anti-collision beam is composed of a front anti-collision plate, a rear anti-collision plate and a plurality of energy-absorbing pieces between the front anti-collision plate and the rear anti-collision plate. These approaches all increase the energy absorbing capacity of the structure by using a multi-layer structure or introducing more energy absorbing devices, which of course increases the production cost and complexity of manufacture.

SUMMERY OF THE UTILITY MODEL

To the above defect of prior art or improve the demand, the utility model provides an arch energy absorption protector through improving thin wall energy absorption device's structure, improves the energy-absorbing efficiency of structure under the longitudinal load, is a low cost, efficient method, effectively reduces processing cost and energy resource consumption, the better practical application requirement that satisfies the energy absorber.

In order to achieve the above object, according to the present invention, there is provided an arch energy absorption protection device, characterized in that, the protection device is an arch for thin-walled pipe and as a whole, including the straight portion at both ends and clamping the circular arc portion between the straight portions, both ends the straight portion is followed the tangential direction of the circular arc portion, and about the circular arc portion is symmetrical, when the protection device receives a longitudinal external force, the longitudinal external force is decomposed into component force along the axial direction of the straight portion, so that the circular arc portion of the protection device is deformed in a concave manner, and the straight portion is deformed in an axial buckling manner, and at the same time, the circular arc portion and the straight portion are both deformed in a bending manner, thereby absorbing energy.

Further preferably, the bottom of the straight line part is provided with a beam which is arranged between the straight line parts at both ends for restraining the lateral deformation of the straight line parts.

Further preferably, the chord length of the arc part is less than or equal to one third of the length of a straight line between the head end and the tail end of the protection device.

Further preferably, the angle of the straight line portion with the horizontal direction is less than or equal to 45 °.

Further preferably, the circular arc portion is a single circular arc or a combination of a circular arc and a straight line.

Further preferably, the circular arc part is internally filled with a porous material, or the circular arc part and the straight line part are internally filled with a porous material.

Further preferably, the thickness of the straight line part is different from that of the circular arc part, so that local thickening of the circular arc part is realized.

Further preferably, the cross-section of the guard is circular, rectangular, polygonal or hat-shaped.

Further preferably, a cross section of the guard is provided with a reinforcing rib, dividing the cross section into a plurality of sections.

Generally, through the utility model discloses above technical scheme who conceives compares with prior art, possesses following beneficial effect:

1. the utility model fully utilizes the structural advantage that the whole arch structure generates axial force along the linear part under the longitudinal load, and locally utilizes the characteristics that the load bearing and energy absorption capacity of the linear part thin-wall tubular structure under the axial force are far higher than that of the transverse load, thereby greatly improving the energy absorption capacity and efficiency of the whole structure under the longitudinal load; in addition, through the design of the cross beam, the lower end of the protective device is fixed, and the cross beam can restrain transverse deformation, so that the arch structure is ensured to have high energy absorption capacity and efficiency.

2. The utility model discloses well energy absorption protector circular arc part chord length less than or equal to the third of total length, and sharp line portion and horizontal direction are less than or equal to 45 acute angles. When the circular arc part is more than one third, the connecting part of the circular arc part and the straight line part is easy to bend and deform under longitudinal load, at the moment, the straight line part mainly bears bending moment, the advantages of strong axial bearing and energy absorption capacity of the straight line part cannot be fully exerted, and the structure tends to be the performance when the whole arch is in a circular arc shape. When the angle of the straight line part to the horizontal direction is increased to more than 45 degrees, the straight line part tends to bear the axial load in the straight line direction under the longitudinal load even if the arc part of the arch structure is not adopted, and the advantage that the arch structure converts the longitudinal load into the load in the axial direction of the straight line part cannot be fully embodied, so that the angle of the straight line part to the horizontal direction is not more than 45 degrees.

3. The utility model discloses an utilize the deformation of structure itself to improve energy absorption efficiency, other methods that improve energy absorption performance include: various porous materials are adopted for filling, the cross sections adopt different shapes, the cross sections are divided into the multi-cell cross sections with various shapes by reinforcing ribs, the thickness of the tube wall is locally increased, and the like, so that the energy absorption efficiency of the arched energy absorption protection device is further improved;

4. the utility model discloses an arch thin wall structure form can increase substantially thin wall structure energy absorption ability and efficiency under vertical load, under the equal quality condition, the utility model discloses an energy-absorbing ability and efficiency are about 2-3 times of the thin wall arched girder that has circular outline line, reduce the weight and the cost of the required energy absorber of structure collision safety protection under the vertical load by a wide margin, when using on vehicle, can make the structure safer and lightweight more, reduce energy consumption and environmental pollution.

Drawings

FIG. 1 is a schematic structural view of an arched energy absorbing shield constructed in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic structural view of an arched energy absorbing shield constructed in accordance with another preferred embodiment of the present invention;

fig. 3 is a schematic view of the construction of the packing material in the arched energy absorbing containment structure constructed in accordance with the preferred embodiment of the present invention, wherein (a) is a schematic view of the arc portion packed with the porous material and (b) is a schematic view of the arch portion packed with the porous material;

fig. 4 is a schematic structural view of a thickened circular arc portion constructed in accordance with a preferred embodiment of the present invention;

fig. 5 is a schematic cross-sectional shape of section a-a of fig. 1 constructed in accordance with a preferred embodiment of the present invention;

fig. 6 is a schematic diagram of different structures of a circular arc part constructed according to a preferred embodiment of the present invention, wherein (a) is a structural diagram of a single circular arc part, and (b) is a structural diagram of a combination of a circular arc and a straight line;

fig. 7 is a force diagram of a thin-walled arcuate tube constructed in accordance with a preferred embodiment of the present invention;

fig. 8 is a force diagram of a thin-walled straight beam constructed in accordance with a preferred embodiment of the present invention;

fig. 9 is a force contrast analysis diagram constructed in accordance with a preferred embodiment of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:

1-straight line part, 2-arc part and 3-beam.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

For the traditional thin-wall straight beam, the bending deformation is mainly applied under the transverse bending load, and the energy absorption capacity and efficiency are far lower than those of the traditional thin-wall straight beam when the traditional thin-wall straight beam is subjected to buckling caused by axial load. For thin-walled arched beams, the specific shape of the arch has a significant impact on performance. The vertical direction of the connecting line of the two ends of the arched girder is taken as the longitudinal direction. The simplest is to use a thin-walled arched beam with a circular outline, which has a higher performance under longitudinal load than a thin-walled straight beam, but still has a much poorer energy absorption capacity under axial load along the straight beam than a thin-walled straight beam with the same cross-sectional shape. The utility model discloses aim at solving the problem that thin wall straight beam member energy absorption efficiency is low under the longitudinal load.

As shown in figure 1, an arch-shaped energy absorption protection device adopts an arch-shaped thin-wall tubular structure, wherein the left section and the right section are straight line parts 1, the middle section is an arc part 2, and the width B of the middle section is less than or equal to one third of the total width S of the arch-shaped energy absorption device, namely B is less than or equal to S/3. Angle between straight line part and bottom surface

The straight line parts 1 at two ends can fully utilize the structural advantage that the arch structure generates axial force along the axial direction of the straight line part under the longitudinal (namely y-direction) load vertical to the arc part, the characteristics that the bearing and energy absorption capacity of the thin-wall straight beam under the axial force is far higher than that of a transverse load are exerted, the arc part generates concave deformation, the straight line part generates axial buckling deformation, and meanwhile, the arc part and the straight line part also generate bending deformation, so that the energy absorption capacity and the efficiency of the integral thin-wall arch structure under the longitudinal load are greatly improved.

As shown in fig. 2, according to another embodiment of the present invention, a beam 3 is provided at the bottom of the arched thin-walled tube to connect the straight portions 1 at both ends, thereby fixing the straight portions. The end constraint conditions have important influence on the performance of the energy absorption protection device, in an actual situation, whether the constraint of the beam on two ends is increased or not can be considered according to the constraint conditions of the external structure on the end of the energy absorption protection device, if the external structure has enough transverse constraint on the energy absorption protection device, an arch-shaped thin-wall structure can be directly adopted, otherwise, the beam can be increased to connect (weld, rivet and the like) the two ends of the arch-shaped structure so as to constrain the movement of the two ends, and then the energy absorption protection device with the beam added is installed on a protected structure; the two ends of the beam can extend outwards to be longer than a connection (welding, riveting and the like) interval with the arch structure, and the extending part is convenient to be connected and fixed with a structure. If not, the inner part can be connected and fixed with the structure.

As shown in fig. 3, the arched thin-walled tube may be made of porous material, including: the foam material, the honeycomb material, the grid material, the lattice material and the like are partially or completely filled to further improve the energy absorption performance of the structure, wherein in (a) in fig. 3, the arc part is filled with the porous material, and in (b) in fig. 3, the arch part of the whole arch-shaped thin-wall pipe fitting is filled with the porous material.

As shown in FIG. 4, the arched thin-wall pipe can also be locally reinforced by adopting thickness, so that the energy absorption efficiency is improved.

As shown in fig. 5, the cross section a-a of the arched thin-walled tube structure of the present invention may be any shape, such as circular, rectangular, polygonal, hat-shaped, etc., or may be in the form of single-cell, multi-cell or combined thin-walled structure. FIG. 5 (a) shows a hat shape, and FIG. 5 (b) shows a multi-cell structure formed by two rectangles; fig. 5 (c) shows a structure of four rectangles forming a plurality of cells, and fig. 5 (d) shows a structure of four sectors forming a plurality of cells. After two ends of the straight line part 1 can be cut into proper shapes, the straight line part is fixed on a structure needing protection by adopting welding, bolt connection and other modes. The integral arched thin-wall pipe fitting can be made of various materials such as metal materials and composite materials, for example, when the metal materials are adopted, the integral arched thin-wall pipe fitting can be formed by locally bending thin-wall pipe fittings with different cross section forms, the processing and the preparation are very convenient, small changes of shapes and sizes can be caused locally in the local bending process of the metal, and the influence of the forming effect on the integral energy absorption effect of the structure is small.

As shown in fig. 6, the arc portion 2 of the middle section of the arch-shaped thin-wall structure can be a single arc section, or a combination of a straight line and an arc, or other curves naturally transitional with straight line portions at two ends. The arc portion in fig. 6 (a) is an integral arc structure, and the arc portion in fig. 6 (b) is an arc-straight line combination structure in which two arcs sandwich a straight line portion at one end.

As shown in fig. 7, under a longitudinal load F, the connection of the two ends of the thin-walled arched beam is constrained to generate an axial compression constraint reaction force F1, that is, the straight line portion of the thin-walled arched beam is under the action of an axial pressure F1, and the thin-walled tube is subjected to buckling deformation under the action of the axial pressure F1 and can continue to absorb energy. Fig. 8 shows that in the deformation process of the conventional thin-wall straight beam, under a transverse load, an axial tension restraining reaction force F2 is generated at the joint of two ends, the thin-wall straight beam is simultaneously subjected to an axial tension force F2, the material is broken under the action of the tension force, and once the material is broken, the structure almost completely loses the energy absorption capacity.

The stress analysis comparison experiment is carried out aiming at a thin-wall straight beam (ST), an arch beam thin-wall pipe end unfixed part (ATS) and an arch beam thin-wall pipe end welded part (ATF) which have the same mass, section shape and wall thickness, figure 9 is a force-displacement curve of the three parts, and as can be seen from the figure, when the contour line of the thin-wall arched energy absorber is a circular arc, the energy absorption performance of the thin-wall arched energy absorber is better than that of the thin-wall straight beam, the ATS is about 50% higher than that of the ST, and the ATF is about 3 times more than that of the ST. It can be seen that the circular arc arch has much better energy absorption than the thin-walled straight beam, and the restraint of the end has a very important influence on the performance.

Under the longitudinal load effect, the utility model discloses well domes's specific shape has important influence to the performance, for example above-mentioned the most simple adoption is convex to be encircleed, and the performance is though than the straight roof beam height of thin wall, but nevertheless than the utility model provides a structural performance is much lower, the utility model discloses an energy-absorbing efficiency is about 2-3 times that convex encircles.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. An arched energy absorption protection device is characterized in that the protection device is a thin-wall pipe and is integrally arched, and comprises straight line parts (1) at two ends and an arc part (2) clamped between the straight line parts, wherein the straight line parts (1) at the two ends are respectively along the tangential direction of the arc part (2) and are symmetrical about the arc part.

2. An arched energy absorbing guard according to claim 1, characterized in that the bottom of the straight parts is provided with a beam (3) arranged between the straight parts (1) at both ends for restraining the straight parts from lateral deformation.

3. An arcuate energy absorbing fender according to claim 1 or claim 2, wherein the arc portion (2) has a chord length less than or equal to one third of the length of a straight line extending between the forward and aft ends of the fender.

4. An arched energy absorbing guard according to claim 3, characterized in that the angle of the straight parts (1) to the horizontal is 45 ° or less.

5. An arched energy absorbing shield according to claim 1, wherein the arc portion (2) is a single arc or a combination of arcs and straight lines.

6. An arched energy absorbing shield according to claim 1, wherein the arc portion (2) is internally filled with porous material, or wherein both the straight portion and the arc portion are internally filled with porous material.

7. An arched energy absorbing guard according to claim 5, characterized in that the thickness of the straight portion (1) is different from the thickness of the circular arc portion (2), achieving a local thickening of the circular arc portion.

8. An arcuate energy absorbing guard according to claim 1 or 2, wherein the guard has a circular, rectangular, polygonal or hat-shaped cross-section.

9. An arcuate energy absorbing guard according to claim 8 wherein the guard has a cross-section with ribs disposed therein dividing the cross-section into a plurality of sections.

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