Combined type multi-cell structure filling threshold beam assembly

Abstract

The invention relates to a combined type multi-cell structure filling threshold beam assembly. Comprising two C-shaped thin plates and a combined multi-cell structure filling structure. The combined type multi-cell structure filling structure comprises a front end different-plane vertex reinforced multi-cell honeycomb, a rear end coplanar vertex reinforced multi-cell honeycomb and a connecting plate; the front-end different-plane vertex reinforced multi-cell honeycomb comprises a plurality of axially-serially-connected reinforced cell elements which are distributed along the axial direction of the doorsill beam and have orthohexagonal sections; the rear-end coplanar vertex reinforced multi-cell honeycomb comprises a plurality of thin-wall cell elements which are transversely distributed along the threshold beam and have regular hexagonal sections, the plurality of thin-wall cell elements form a coplanar multi-cell honeycomb structure by overlapping boundaries, and the inner sections of the regular hexagons are circular, so that arc-shaped reinforced cell walls are formed at the vertex positions of the regular hexagons; and the radiuses of the internal circles from the middle to the two sides are gradually increased. Large collision energy is transmitted and absorbed when a vehicle is subjected to front-face small-overlap offset collision and side-face collision, and the impact resistance of the threshold beam structure is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile collision safety, and in particular relates to a combined multi-cellular structure filled door sill beam assembly. Background Art

[0002] In frontal small overlap offset collision and side collision conditions, the threshold beam structure is an important key component for resisting impact and transmitting loads. Its deformation degree and energy absorption characteristics in the collision will directly affect the injury degree of the occupants. The polyhedral structure shows good stability and safety when carrying a large load, and can reduce weight while improving its mechanical properties. The application of polyhedral structure in the design of threshold beams has important practical significance for improving the collision safety of automobiles.

[0003] Patent CN113998003A discloses a threshold beam assembly and a car, including a threshold beam body and a reinforcement structure. The threshold beam body is a hollow structure formed by extrusion of a metal material. A plurality of body dividing surfaces are arranged in the threshold beam body. The body dividing surfaces are used to divide the threshold beam body into a first cavity and a plurality of second cavities along the radial direction of the threshold beam body. The reinforcement structure is a hollow structure formed by extrusion of a metal material. The reinforcement structure is filled in the first cavity, and the radial cross-sectional shape of the reinforcement structure matches the radial cross-sectional shape of the first cavity.

[0004] Patent CN113978562A discloses a novel threshold beam structure, including two outer plates, the inner wall of the outer plates is tightly fitted with a filling mechanism, the filling mechanism includes a main beam with an "I"-shaped cross section, and energy absorption modules are arranged on both sides of the main beam, one side of the energy absorption module is provided with a clamping groove, and the upper and lower ends of the energy absorption module are respectively provided with dovetail grooves, the other side of the energy absorption module is longitudinally provided with a first connecting groove, and the other side of the energy absorption module is transversely provided with a second connecting groove, the upper and lower ends of the energy absorption module are respectively provided with reinforcement blocks, the bottom end of the reinforcement block is connected with a dovetail tenon, and the top end of the reinforcement block is provided with a third connecting groove.

[0005] The prior art solution of the above patent is mainly to improve the impact resistance of the sill beam by changing the cross-sectional form of the sill beam, by constructing a cavity structure inside the sill beam, adding an anti-side impact support plate or adding a hollow reinforcement structure with matching shape, but the structure is still a hollow beam or a thin-walled sheet metal structure. Although it has strong axial impact resistance, it is prone to bending and deformation when subjected to lateral impact, the peak collision force is significantly increased, the crushing deformation is relatively concentrated, and the force transmission and diffusion capacity is poor, resulting in poor energy absorption during side collision. Summary of the invention

[0006] The purpose of the present invention is to overcome the problem that the existing rocker beam reinforcement structure has poor energy absorption effect when subjected to lateral impact, and to provide a combined multi-cellular structure filled rocker beam assembly, which simultaneously improves the axial and lateral impact resistance and energy absorption characteristics of the rocker beam structure, meets the vehicle's frontal small overlap offset collision and side collision safety requirements, and takes into account the issues of vehicle body strength improvement and lightweight, and simplified manufacturing and assembly processes.

[0007] The technical solution to achieve the purpose of the present invention is: a combined multi-cellular structure filled threshold beam assembly, including two C-shaped thin plates and a combined multi-cellular structure filling structure filled in the cavity formed by the two C-shaped thin plates; the combined multi-cellular structure filling structure includes a front end non-planar vertex reinforced multi-cellular honeycomb, a rear end coplanar vertex reinforced multi-cellular honeycomb and a connecting plate;

[0008] The front end non-planar vertex reinforced multicellular honeycomb includes a plurality of axially connected reinforced cells with regular hexagonal cross-sections distributed along the axial direction of the threshold beam. A plurality of identical cells form a non-planar multicellular honeycomb structure by overlapping boundaries. Each vertex position of the regular hexagon is provided with an arc-shaped reinforced cell wall. The plurality of cells are interconnected at the vertices to form a reinforced area at the internal end point of the multicellular honeycomb structure. The wall thickness of the regular hexagonal matrix of each thin-walled cell remains unchanged from front to back, and the arc-shaped reinforced cell wall gradually increases.

[0009] The rear end coplanar vertex reinforced multicellular honeycomb includes a plurality of thin-walled cells with regular hexagonal cross sections distributed transversely along the threshold beam, and the plurality of thin-walled cells form a coplanar multicellular honeycomb structure by overlapping boundaries, and the inner cross section of the regular hexagon is circular, so that arc-shaped reinforced cell walls are formed at each vertex position of the regular hexagon, and the plurality of thin-walled cells are connected to each other at the vertices to form a reinforced area at the internal end points of the multicellular honeycomb structure, and the radius of the inner circle gradually increases from the middle to the two sides;

[0010] The front end non-planar vertex reinforced multicellular honeycomb and the rear end coplanar vertex reinforced multicellular honeycomb are connected by a connecting plate.

[0011] Furthermore, the C-shaped thin plate is stamped from a metal material, the C-shaped thin plate is connected by spot welding at the welding edges on both sides, and a cavity is formed in the middle of the C-shape.

[0012] Furthermore, the front end non-planar vertex reinforced multi-cellular honeycomb and the rear end coplanar vertex reinforced multi-cellular honeycomb are made of CBS plastic or nylon.

[0013] Furthermore, the length ratio of the front end non-planar vertex reinforced multi-cellular honeycomb and the rear end coplanar vertex reinforced multi-cellular honeycomb along the axial direction of the threshold beam is 1:2.

[0014] Furthermore, the front end non-planar vertex reinforced multicellular honeycomb and the rear end coplanar vertex reinforced multicellular honeycomb are respectively connected to the connection plate by gluing.

[0015] Furthermore, the radius r of the arc-shaped strengthening cell wall of the axial series strengthening cell of the front non-surface vertex strengthening multi-cellular honeycomb gradually changes from L1 to Where L1 is the inner side length of the axial series strengthening cell, and the thickness t1 of the axial series strengthening cell matrix remains unchanged.

[0016] Furthermore, the cross-sectional shape of the rear end coplanar vertex strengthened multi-cellular honeycomb transverse parallel strengthened cell is a regular hexagon, and the internal shape is a circle. The external dimensions of all cell cross-sections are the same, and the radius of the internal circle increases gradually from the middle to the two sides, and the radius of the internal circle of the cell increases from the middle to the left. Gradually transition to the outermost Where L2 is the transverse parallel strengthening cell, and t2 is the wall thickness of the transverse parallel strengthening cell.

[0017] Compared with the prior art, the present invention has the following significant advantages:

[0018] When the vehicle is subjected to a frontal small overlap offset collision, the multi-cellular honeycombs reinforced with unequal vertices at the front end of the sill beam structure of the present invention absorb energy through the buckling of the single-cell cell walls and the in-plane deformation, and at the same time form an internal support reinforcement effect on the sill beam with wrinkled deformation, thereby improving the vehicle's small offset collision safety; and when the vehicle is subjected to a side collision, the multi-cellular honeycombs reinforced with coplanar vertices at the rear end improve the overall strength of the sill beam through its coplanar overall bearing capacity, avoid local bending and deformation of the sill beam, disperse the collision force through overall deformation, better realize load transfer and energy absorption, and improve the vehicle's side collision safety; the folding failure deformation of the traditional thin-walled structure when subjected to an impact is mainly concentrated at the connection position of the cell wall.

[0019] The present invention designs arc-shaped strengthening cell walls at each vertex position of the thin-walled cell, thereby forming a strengthening area at the internal end points of the multi-cellular honeycomb structure, which helps to form an axisymmetric progressive buckling deformation mode with ideal energy absorption. At the same time, the axial series, transverse parallel and three-dimensional mixed strengthening design of the honeycomb structure are carried out by changing the thickness of the arc-shaped cell walls of the thin-walled cell. The impact resistance is guided by the design without changing the macroscopic size of the honeycomb structure, and a filling and strengthening structure with different energy absorption characteristics is obtained.

[0020] The multi-cellular structure of the present invention can be formed by CBS plastic or nylon injection molding, has a high level of structural lightness, can be filled into the internal cavity of the threshold beam by gluing or the like, and has a simple manufacturing and assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the combined multi-cellular structure filled threshold beam assembly of the present invention; (a) is a three-dimensional schematic diagram, and (b) is an exploded diagram.

[0022] Figure 2It is a schematic diagram of the combined multi-cell filling structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the front end non-surface vertex reinforced multi-cellular honeycomb structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the rear end coplanar vertex reinforced multi-cellular honeycomb structure of the present invention.

[0025] Figure 5 Schematic diagram of the axial series strengthening cell (taking a regular hexagonal cross section as an example) of the present invention; (a) is a three-dimensional schematic diagram, (b) is a front view, and (c) is a rear view.

[0026] Figure 6 It is a schematic cross-sectional view of the axially series reinforced cell structure of the present invention.

[0027] Figure 7 This is a schematic diagram of the transverse parallel reinforced honeycomb structure of the present invention.

[0028] Figure 8 It is a cross-sectional schematic diagram of the transverse parallel reinforced honeycomb structure of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] The outer plate and the inner plate of the threshold beam of the present invention are both C-shaped thin plate structures formed by stamping of metal materials, and the two ends of the thin plate section have bent welding edges ( Figure 1 As shown), the two parts are connected by spot welding at the welding edge to form a cavity.

[0031] The combined multi-cellular structure filling structure is composed of a front-end non-planar vertex reinforced multi-cellular honeycomb, a rear-end coplanar vertex reinforced multi-cellular honeycomb and a connecting plate ( Figure 2 shown).

[0032] The front end non-surface vertex reinforced multi-cell honeycomb includes a plurality of thin-walled cell structures with regular hexagonal shapes distributed along the axial direction of the threshold beam ( Figure 3 As shown in the figure, multiple thin-walled cells overlap their boundaries to form a heterogeneous multicellular honeycomb structure. Each vertex of the regular hexagon is provided with an arc-shaped reinforced cell wall with increased thickness. Multiple thin-walled cells are connected to each other at the vertices to form a reinforced area at the internal end points of the multicellular honeycomb structure. When the vehicle is subjected to a frontal small overlap offset collision, the front heterogeneous vertex reinforced multicellular honeycomb presents a layer-by-layer progressive collapse deformation mode from the impact end to the rear end, absorbing energy through cell wall buckling and in-plane deformation, while forming an internal support reinforcement effect on the wrinkled threshold beam, thereby improving the vehicle's small offset collision safety.

[0033] The rear end coplanar vertex reinforced multi-cell honeycomb includes a plurality of thin-walled cell structures with regular hexagonal shapes distributed laterally along the threshold beam ( Figure 4 As shown in the figure, multiple thin-walled cells overlap their boundaries to form a coplanar multicellular honeycomb structure. Each vertex of the regular hexagon is provided with an arc-shaped reinforced cell wall with increased thickness. Multiple thin-walled cells are interconnected at the vertices to form a reinforced area at the internal end points of the multicellular honeycomb structure. When the vehicle is hit from the side, the rear end coplanar vertex reinforced multicellular honeycomb improves the overall strength of the threshold beam through its coplanar overall bearing capacity, avoids local bending and deformation of the threshold beam, disperses the collision force through overall deformation, and better realizes load transfer and energy absorption. The multicellular structure itself absorbs energy stably through layer-by-layer collapse, which improves the vehicle's side collision safety as a whole.

[0034] The vertex reinforcement design can significantly improve the bearing capacity of the thin-walled cell structure at the connection, and help the multi-cell structure form a deformation collapse mode of progressive buckling, thereby improving the impact resistance and energy absorption characteristics of the multi-cell filled threshold beam. The honeycomb structure formed by the combination of the front non-planar vertex reinforced multi-cell honeycomb and the rear coplanar vertex reinforced multi-cell honeycomb can simultaneously improve the axial and lateral impact resistance of the threshold beam.

[0035] Regular hexagonal axial series strengthening cell ( Figure 5-6 The length of the cell side is L1, the wall thickness of the six sides of the cell is t1, and the radius of the arc cell wall is r1. The thickness of the arc-shaped strengthening cell wall at the vertex of the thin-walled cell can be designed by changing the arc radius. The radius of the arc cell wall r1 has a certain range. According to the properties of the regular hexagon, r 1min is the distance from the center point to the center of any side, that is r max is the distance from the center point to the vertex of the regular hexagon, that is, r 1max =L1, so the range of r1 is When the arc radius r1 is small, the cell vertex reinforcement wall thickness is large, and vice versa when the arc radius r1 is large, the cell vertex reinforcement wall thickness is small. The cell vertex reinforcement wall thickness gradually decreases with the increase of the arc radius.

[0036] By changing the thickness of the curved cell wall of the thin-walled cell, a gradient design is performed to achieve better impact resistance and energy absorption characteristics. In particular, when the thickness of the curved cell wall of the thin-walled cell changes continuously along the axial direction, that is, the value of the curved cell wall radius r1 changes evenly, thus forming an axial series strengthening cell ( Figure 6 As shown in FIG. 1 , a plurality of thin-walled cells are formed into an axially series-strengthened honeycomb by overlapping boundaries.

[0037] The thickness of the arc-shaped thin wall of the thin-walled cell can be gradiently changed in a modular form along one or more directions on the transverse surface of the honeycomb structure, thereby forming a transverse parallel strengthened honeycomb ( Figure 7-8 shown), Figure 7 The thickness of the arc-shaped thin wall of the thin-walled cell strengthened in parallel in the middle decreases from the middle to the sides, and the radius of the arc-shaped cell wall r2 increases from the middle to the sides, eventually forming a symmetrical honeycomb structure, which helps to form an ideal axisymmetric progressive buckling deformation mode for energy absorption. The cross-section of the multi-cellular honeycomb strengthened in parallel in the rear end with coplanar vertices is a regular hexagon on the outside and a circle on the inside. The outer dimensions of all the cell cross-sections are the same, and the radius of the inner circle gradually increases from the middle to the sides, and the radius of the inner circle of the cell increases from the middle to the sides. Gradually transition to the outermost Where L2 is the outer side length of the transverse parallel strengthening cell, and t2 is the wall thickness of the transverse parallel strengthening cell.

[0038] The thickness of the curved thin wall of the cell in the transverse parallel honeycomb structure can also change along the axial direction, thus forming a three-dimensional hybrid reinforced honeycomb. By changing the thickness of the reinforced thin wall at the vertex of the thin-walled cell and performing series, parallel and hybrid honeycomb reinforcement design through different periodic expansion forms, it is possible to achieve the guided design of the collision force and energy absorption curve without changing the structural mass and macroscopic size, and obtain a filling structure with different energy absorption characteristics.

Claims

1. A combined multi-cellular structure filled threshold beam assembly, characterized in that: It includes two C-shaped thin plates and a combined multi-cellular structure filling structure filled in the cavity formed by the two C-shaped thin plates; The combined multi-cellular structure filling structure includes a front-end non-planar vertex reinforced multi-cellular honeycomb, a rear-end coplanar vertex reinforced multi-cellular honeycomb and a connecting plate; The front end non-planar vertex reinforced multicellular honeycomb includes a plurality of axially connected reinforced cells with regular hexagonal cross-sections distributed along the axial direction of the threshold beam. A plurality of identical cells form a non-planar multicellular honeycomb structure by overlapping boundaries. Each vertex position of the regular hexagon is provided with an arc-shaped reinforced cell wall. The plurality of cells are interconnected at the vertices to form a reinforced area at the internal end point of the multicellular honeycomb structure. The wall thickness of the regular hexagonal matrix of each thin-walled cell remains unchanged from front to back, and the arc-shaped reinforced cell wall gradually increases. The rear end coplanar vertex reinforced multicellular honeycomb includes a plurality of thin-walled cells with regular hexagonal cross sections distributed transversely along the threshold beam, and the plurality of thin-walled cells form a coplanar multicellular honeycomb structure by overlapping boundaries, and the inner cross section of the regular hexagon is circular, so that arc-shaped reinforced cell walls are formed at each vertex position of the regular hexagon, and the plurality of thin-walled cells are connected to each other at the vertices to form a reinforced area at the internal end points of the multicellular honeycomb structure, and the radius of the inner circle gradually increases from the middle to the two sides; The front end non-planar vertex reinforced multicellular honeycomb and the rear end coplanar vertex reinforced multicellular honeycomb are connected by a connecting plate.

2. The combined multi-cellular structure filled threshold beam assembly according to claim 1, characterized in that: The C-shaped thin plate is formed by stamping a metal material. The C-shaped thin plate is connected by spot welding at the welding edges on both sides, and a cavity is formed in the middle of the C-shape.

3. The combined multi-cellular structure filled threshold beam assembly according to claim 1, characterized in that: The front end non-planar vertex reinforced multi-cellular honeycomb and the rear end coplanar vertex reinforced multi-cellular honeycomb are made of CBS plastic or nylon.

4. The combined multi-cell structure filled threshold beam assembly according to claim 1, characterized in that: The length ratio of the front end non-planar vertex reinforced multi-cellular honeycomb and the rear end coplanar vertex reinforced multi-cellular honeycomb along the axial direction of the threshold beam is 1:

2.

5. The combined multi-cellular structure filled threshold beam assembly according to claim 1, characterized in that: The front end non-planar vertex reinforced multi-cellular honeycomb and the rear end coplanar vertex reinforced multi-cellular honeycomb are respectively connected to the connection plate by gluing.

6. The combined multi-cellular structure filled threshold beam assembly according to claim 1, characterized in that: The radius r of the arc-shaped strengthening cell wall of the axial series strengthening cell of the front non-surface vertex strengthening multi-cellular honeycomb gradually changes from L1 to Where L1 is the inner side length of the axial series strengthening cell, and the thickness t1 of the axial series strengthening cell matrix remains unchanged.

7. The combined multi-cellular structure filled threshold beam assembly according to claim 1, characterized in that: The outer shape of the cross-section of the rear coplanar vertex-strengthened multi-cell honeycomb in parallel is a regular hexagon, and the inner shape is a circle. The outer dimensions of all the cross-sections of the cells are the same. The radius of the inner circle increases gradually from the middle to the sides, and the radius of the inner circle of the cell increases from the middle to the sides. Gradually transition to the outermost Where L2 is the transverse parallel strengthening cell, and t2 is the wall thickness of the transverse parallel strengthening cell.

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