CN111619489A

CN111619489A - Collision energy absorption box with rotary folding concave angle

Info

Publication number: CN111619489A
Application number: CN202010494216.3A
Authority: CN
Inventors: 刘鑫; 陈德; 刘祥
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2020-09-04
Anticipated expiration: 2040-06-03
Also published as: CN111619489B

Abstract

The invention discloses a collision energy absorption box with a rotary folding reentrant corner, which comprises a three-dimensional energy absorption area and a folding energy absorption area; the collision energy absorption box is composed of a plurality of three-dimensional energy absorption areas and folding energy absorption areas which are arranged in a mode of crossing from top to bottom; the three-dimensional energy absorption area is a thin-wall pipe with a polygonal section; rotary folding concave angles which are arranged circumferentially are formed in the folding energy absorption area through crease lines and in combination with a rotary folding mode; the surface of the whole collision energy absorption box structure is a developable surface, so that the collision energy absorption box structure is convenient to process and low in manufacturing cost; according to the invention, through the two-stage buffering of the collision energy absorption box, not only can the initial peak force generated in the collision process be effectively reduced, but also the higher energy absorption rate of the collision energy absorption box can be ensured; meanwhile, the rotary folding concave angles arranged in the circumference are firstly compressed and deformed under the action of load, and form the constraint action similar to that of the diaphragm plate, so that the collision energy absorption box has a stable deformation mode and good defect resistance.

Description

Collision energy absorption box with rotary folding concave angle

Technical Field

The invention relates to the technical field of automobile collision safety, in particular to a collision energy absorption box with a rotary folding reentrant corner.

Background

Crashworthiness of an automobile is one of important indicators of safety performance of the automobile. At present, people usually install crash boxes with different structural forms at the parts of automobiles which are easy to collide so as to effectively absorb huge impact energy generated in the collision process. The common collision energy absorption box is a thin-wall structure pipe made of metal, and impact energy is absorbed and dissipated through deformation of the thin-wall structure pipe, so that the safety of an automobile main body structure and automobile passengers is guaranteed.

Crash resistance of crash boxes is generally judged by several criteria: the collision protection device has the advantages that the peak load is low, so that excessive damage to a human body or goods is avoided due to the force transmitted in the collision starting stage; the energy absorption material has high specific energy absorption (the specific energy absorption is defined as the ratio of the absorbed energy to the self mass); the third step of setting a stable preset deformation mode; fourthly, a high compressible stroke; the manufacturing cost is low. However, in consideration of complex working conditions such as high impact speed, uncertain impact load (which may be a frontal impact or a bias impact) and the like during the collision of the automobile, the crash box needs to have good defect resistance.

In the actual collision process, the energy absorption effect of the existing collision energy absorption box is limited, and the following problems exist:

1. the conventional crash box is usually of a common thin-wall structure or a multi-cell thin-wall structure, but the crash box of the structure can generate a large initial peak force. In order to reduce the initial peak force of the crash box, a small part of the prior art uses a technical scheme of introducing crease lines, for example, in a patent with the publication number of CN101638076A and the name of "a crease type crash box", the technical scheme is as follows: a thin-wall pipe is divided into a plurality of modules along the axial direction, and a diamond-shaped concave angle is arranged at each corner area of each module at a certain distance along the axial direction. However, under the influence of geometric defects, sharp corners in the diamond reentrant angles are sensitive to the defects, and the problem of structural stability exists.

2. In order to overcome the disadvantage of unstable deformation mode of the crash box, a small number of prior arts achieve this object by increasing the constraint condition, such as the patent with publication number CN102700618A entitled "a diaphragm reinforced thin-walled energy absorbing tube", in which diaphragms for reinforcement are arranged at certain intervals inside the thin-walled tube. By increasing constraint conditions, the non-compact deformation mode of the thin-walled tube is restrained, so that the thin-walled structure generates a gradual stable deformation mode under axial impact compression. The thin-wall energy absorption tube is additionally provided with an additional built-in structure and is precisely connected with the thin-wall tube, so that the processing technology is difficult.

3. In the actual collision process, a complex load working condition can occur, and the existing collision energy absorption box structure has the defect of weak defect resistance, so that the complex collision load cannot be responded.

Disclosure of Invention

In order to overcome the problems, the invention provides a crash box with a rotary folding reentrant corner which simultaneously solves the problems.

The technical scheme adopted by the invention for solving the technical problems is as follows: a collision energy-absorbing box with rotary folding reentrant corner, the said collision energy-absorbing box is formed by multiple stereoscopic energy-absorbing areas and folding energy-absorbing areas; the three-dimensional energy absorption area and the folding energy absorption area are formed in a mode of being arranged in a cross mode from top to bottom; the three-dimensional energy absorption area is a thin-wall pipe with a polygonal section; the folding energy absorption area forms rotary folding concave angles which are arranged circumferentially by crease lines and combining a rotary folding mode.

Preferably, the polygonal section of the three-dimensional energy absorption area is a quadrangle, a pentagon, a hexagon or an octagon.

Preferably, the crease lines of the folding energy absorption area are of a symmetrical structure and are formed by two right-angled trapezoids and an isosceles triangle; the short side and the oblique side of the right trapezoid are valley creases; the right-angle sides and the long sides of the right trapezoid, and the middle lines and the bottom sides of the isosceles triangles are peak creases.

Preferably, the rotation direction of the rotary folding reentrant corner of the folding energy absorption area is clockwise or anticlockwise.

Preferably, the fold concave angles of the fold energy absorption areas are of different types, including different shapes, different sizes or different inclination angles.

Preferably, the height of the single three-dimensional energy absorption area is equal to or different from the height of the single folding energy absorption area.

The invention has the beneficial effects that:

1. aiming at the point 1 provided by the background technology, the invention adopts the crash energy absorption box consisting of a plurality of three-dimensional energy absorption areas and folding energy absorption areas to solve the problem. The folding energy absorption area is formed by circumferentially arranged rotary folding concave angles formed by crease lines. In the collision process, the rotary folding concave angle of the folding energy absorption area is firstly compressed and deformed under the action of load, so that primary buffering is realized; the three-dimensional energy absorption area is compressed and deformed, so that the absorption and dissipation of the collision energy of the main body are completed, and secondary buffering is realized. The two-stage buffering of the collision energy absorption box can effectively reduce the initial peak force generated in the collision process and ensure that the collision energy absorption box has higher energy absorption rate.

2. Aiming at the 2 nd point proposed by the background technology, the invention adopts the following design: the folding energy absorption area of the collision energy absorption box is formed by circumferentially arranged rotary folding concave angles formed by crease lines. The rotary folding concave angles of the folding energy absorption area are compressed and deformed in advance under the action of load, and form a restraining effect similar to that of the diaphragm, so that the collision energy absorption box generates a gradual and stable deformation mode. Meanwhile, in the processing technology, the invention adopts the expandable surface, namely the surface of the invention is a plane after being completely expanded, so the invention can be formed by pressing and welding metal (aluminum alloy or steel and the like) plates. When the plate is pressed and formed, the processing is convenient, and the production cost is lower.

3. Aiming at the 3 rd point provided by the background technology, the invention adopts the rotary folding concave angle of the folding energy absorption area to solve the problem. The circumferential arrangement of the rotary folding concave angles enables the crash box to cope with complex loads in the crash process, so that the defect resistance of the crash box is improved.

Note: the foregoing designs are not sequential, each of which provides a distinct and significant advance in the present invention over the prior art.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of a square cross-section crash box in an exemplary embodiment;

FIG. 2 is a plan view of an embodiment of a square cross-section crash box in an expanded view;

FIG. 3 is a schematic diagram of the formation of a hybrid type I crash box according to an exemplary embodiment;

FIG. 4 is a plan view of a hybrid type I crash box in an exemplary embodiment;

FIG. 5 is a schematic diagram of a hybrid type II crash box in accordance with an exemplary embodiment;

FIG. 6 is a plan view of a hybrid type II crash box in an exemplary embodiment;

FIG. 7 is a schematic diagram illustrating the formation of a hybrid type III crash box according to an exemplary embodiment;

FIG. 8 is a plan view of a hybrid type III crash box in accordance with an exemplary embodiment;

FIG. 9 is a schematic diagram of the formation of a hybrid type IV crash box according to an exemplary embodiment;

FIG. 10 is a plan view of a hybrid type IV crash box in accordance with an exemplary embodiment.

In the figures, the reference numerals are as follows:

1. a square section crash box 2, a square section 3, a three-dimensional energy absorption area 4, a I-type folding concave angle 5, a I-type folding energy absorption area 6, a valley fold 7, a peak fold 8, a mixed I-type crash box 9, a mixed II-type crash box 10, a II-type folding concave angle 11, a II-type folding energy absorption area 12, a mixed III-type crash box 13, a mixed IV-type crash box 14, a III-type folding concave angle 15, an IV-type folding concave angle 16, a III-type folding energy absorption area 17 and an IV-type folding energy absorption area

Detailed Description

Example 1: FIGS. 1 and 2 illustrate one embodiment of a square cross-section crash box.

As shown in fig. 1, a square-section crash box 1 is composed of a plurality of three-dimensional energy-absorbing regions 3 and i-type folding energy-absorbing regions 5, and the three-dimensional energy-absorbing regions 3 and the i-type folding energy-absorbing regions 5 are arranged from top to bottom at intervals; the collision energy-absorbing boxes with different heights can be obtained by axially superposing a plurality of three-dimensional energy-absorbing areas and folding energy-absorbing areas. The I-type folding energy absorption area 5 forms rotary folding concave angles which are arranged circumferentially through crease lines and in combination with a rotary folding mode, the rotary folding concave angles in the I-type folding energy absorption area 5 are I-type folding concave angles 4, and the I-type folding concave angles 4 are folding concave angles with clockwise rotation directions. Each I-shaped folding energy absorption area 5 of the square-section collision energy absorption box 1 is provided with a circle of circumferentially arranged rotary folding concave angles, and each I-shaped folding energy absorption area 5 comprises four I-shaped folding concave angles 4; two I-shaped folding energy absorption areas 5 are arranged in the square-section collision energy absorption box 1, so that the formed square-section collision energy absorption box 1 has eight I-shaped folding concave angles 4. While FIG. 2 depicts the deployed shape of the crash box, the axial heights of the individual volumetric and folded energy absorption regions need not be equal. The folds in fig. 2 are indicated by a dashed line and a solid line on the plane, wherein the dashed line indicates a valley fold 6 and the solid line indicates a peak fold 7. If the folding is carried out according to the crease on the plane, the crash box 1 with the square section as shown in figure 1 can be finally obtained.

Example 2: fig. 3 and 4 illustrate one embodiment of a hybrid type i crash box.

As shown in fig. 3, the hybrid i-type crash box 8 is composed of a three-dimensional energy-absorbing region 3 and an i-type folding energy-absorbing region 5, and the three-dimensional energy-absorbing region 3 and the i-type folding energy-absorbing region 5 are arranged in a top-down cross arrangement manner. Wherein, an I type folding energy-absorbing area 5 is arranged between two three-dimensional energy-absorbing areas 3, and two I type folding energy-absorbing areas 5 are continuously arranged between the other two three-dimensional energy-absorbing areas 3. Each I-shaped folding energy absorption area 5 is provided with a circle of rotary folding concave angles which are arranged circumferentially, and each I-shaped folding energy absorption area 5 comprises four I-shaped folding concave angles 4; as shown in fig. 4, there are three i-fold energy-absorbing regions 5 in the hybrid i-crash box 8, i.e., twelve i-fold reentrant angles 4 in the hybrid i-crash box 8. The deployment plane of the hybrid type ii crash box 8 and the crease pattern distribution thereon are shown in fig. 4.

Example 3: fig. 5 and 6 illustrate an embodiment of a hybrid type ii crash box.

As shown in fig. 5, the hybrid type ii crash box 9 is composed of a three-dimensional energy absorbing region 3, a type i folding energy absorbing region 5, and a type ii folding energy absorbing region 11. Wherein, the I-type folding energy absorption area 5 and the II-type folding energy absorption area 11 are arranged on the hybrid II-type collision energy absorption box 9 at intervals. The difference between the type I folding energy absorption area 5 and the type II folding energy absorption area 11 is as follows: the rotary folding concave angle in the I-type folding energy absorption area 5 is an I-type folding concave angle 4, the rotary folding concave angle in the II-type folding energy absorption area 11 is an II-type folding concave angle 10, the rotating direction of the I-type folding concave angle 4 is clockwise, and the rotating direction of the II-type folding concave angle 10 is anticlockwise. The unfolding plane of the hybrid type ii crash box 9 and the crease pattern distribution thereon are shown in fig. 6.

Example 4: fig. 7 and 8 illustrate an embodiment of a hybrid type iii crash box.

As shown in fig. 7, the hybrid type iii crash box 12 is composed of a three-dimensional energy absorbing region 3, a type i folding energy absorbing region 5, and a type ii folding energy absorbing region 11. Wherein the type I folding energy absorption area 5 and the type II folding energy absorption area 11 are continuously arranged in the mixed type III crash energy absorption box 12. The turning directions of the folding concave angles in the I-type folding energy absorption area 5 and the II-type folding energy absorption area 11 are opposite. The deployment plane of the hybrid type iii crash box 12 and the crease pattern distribution thereon are shown in fig. 8.

Example 5: fig. 9 and 10 illustrate one embodiment of a hybrid type iv crash box.

As shown in fig. 9, the hybrid type-iv crash box 13 is composed of a three-dimensional energy-absorbing region 3, a type-i folding energy-absorbing region 5, a type-iii folding energy-absorbing region 16, and a type-iv folding energy-absorbing region 17. The folding concave angle of the rotary type I in the folding energy absorption area 5 is a folding concave angle of the type I4, the folding concave angle of the rotary type III in the folding energy absorption area 16 is a folding concave angle of the type III 14, and the folding concave angle of the rotary type IV in the folding energy absorption area 17 is a folding concave angle of the type IV 15; the III-type folding reentrant angle 14 is different from the I-type folding reentrant angle 4 in size, and the IV-type folding reentrant angle 15 is different from the I-type folding reentrant angle 4 in inclination angle. The deployment plane of the hybrid type iv crash box 13 and the crease pattern distribution thereon are shown in fig. 10. It should be noted that: the rotary folding reentrant corner for forming the folding energy absorption area of the crash energy absorption box can adopt any one of the I-type folding reentrant corner 4, the II-type folding reentrant corner 10, the III-type folding reentrant corner 14 and the IV-type folding reentrant corner 15.

Claims

1. The utility model provides a crash box with reentrant angle is folded in rotation which characterized in that: the collision energy absorption box is composed of a plurality of three-dimensional energy absorption areas and folding energy absorption areas; the three-dimensional energy absorption area and the folding energy absorption area are formed in a mode of being arranged in a cross mode from top to bottom; the three-dimensional energy absorption area is a thin-wall pipe with a polygonal section; the folding energy absorption area forms rotary folding concave angles which are arranged circumferentially by crease lines and combining a rotary folding mode.

2. The crash box with rotary folding reentrant corner of claim 1, wherein: the polygonal section of the three-dimensional energy absorption area is a quadrangle, a pentagon, a hexagon or an octagon.

3. The crash box with rotary folding reentrant corner of claim 1, wherein: the crease lines of the folding energy absorption area are of a symmetrical structure and are formed by two right-angled trapezoids and an isosceles triangle; the short side and the oblique side of the right trapezoid are valley creases; the right-angle sides and the long sides of the right trapezoid, and the middle lines and the bottom sides of the isosceles triangles are peak creases.

4. The crash box with rotary folding reentrant corner of claim 1, wherein: the rotating direction of the folding concave angle of the folding energy absorption area rotary type is clockwise or anticlockwise.

5. The crash box with rotary folding reentrant corner of claim 1, wherein: the folding concave angle of the folding energy absorption area has different types, including different shapes, different sizes or different inclination angles.

6. The crash box with rotary folding reentrant corner of claim 1, wherein: the height of the single three-dimensional energy absorption area is equal to or unequal to that of the single folding energy absorption area.