CN107512316B - A segmented automobile B-pillar structure - Google Patents

Abstract

The invention discloses a sectional type automobile B column structure, which comprises a plurality of double-layer column pipes and column pipe joints connected among the double-layer column pipes; the double-layer cylindrical tube includes: an octagonal inner tube; the octagonal outer layer tube is sleeved outside the octagonal inner layer tube and is parallel to the octagon of the inner layer tube; a reinforcing rib provided between adjacent vertexes of the inner tube and the outer tube in the lateral direction of the automobile; a filler filled between the inner layer tube and the outer layer tube; the cylindrical pipe joint includes: a connection plate having an upper surface and a lower surface at an inclined angle; an upper connection part provided on the upper surface for matingly receiving the double-layered cylindrical tube at an upper part; and the lower connecting part is arranged on the lower surface and is used for matching and accommodating the double-layer columnar pipe positioned at the lower part. The segmented automobile B column structure provided by the invention has stronger rigidity and good energy absorption characteristic.

Description

A segmented automobile B-pillar structure

technical field

The invention belongs to the technical field of auto parts and safety, and in particular relates to a segmented automobile B-pillar structure.

Background technique

With the popularity of automobiles, people have higher and higher requirements for automobile performance. While improving power, economy, and comfort, the requirements for safety are also becoming more and more stringent. The improvement of automobile safety performance can effectively avoid the occurrence of accidents or reduce the degree of casualties.

The B-pillar of a car is located between the front seat and the rear seat of a four-door car. It is installed on the threshold beam to support the metal column structure of the cockpit roof. It has an important protective effect on the members of the cockpit in the event of a side collision or rollover. Since the distance between the B-pillar of the car and the occupant is small during the side collision process, it is necessary for the B-pillar to have sufficient rigidity to resist collision deformation, provide a larger living space for the occupant, and also need to have better energy absorption characteristics. Quickly absorb the energy of the side collision to avoid serious injury to the occupants due to excessive acceleration during the collision, and have a better force transmission path, and transfer the remaining collision energy after absorption to the main load-bearing parts of the car body as soon as possible, making the car Transforms together, reducing damage to crew members.

The current automobile B-pillar structure is complex, generally composed of high-strength steel stamped B-pillar outer panel, B-pillar inner panel and multiple reinforcement panels. The B-pillar shape of each model is different, and the versatility is poor. Sheet metal parts must be made of expensive molds, and the stamping and forming manufacturing process of high-strength steel is cumbersome and the processing cost is high. Moreover, while the B-pillar satisfies high rigidity, it is difficult to ensure good energy absorption characteristics, and all require the auxiliary protection of side airbags.

Bamboo bears huge wind loads in the natural environment. In order to adapt to this environment, the bottom of bamboo bears the maximum tensile and compressive stress without damage, thus forming its unique micro- and macro-structure. Bamboo is a natural long-fiber composite material, which can be approximated as a composite of basic tissue composed of parenchyma cells and reinforcing fibers composed of sclerenchyma cells mainly composed of vascular bundles. Z. P. Shao et al. (2010) calculated that the elastic modulus and tensile strength of the thin-walled basic tissue of Moso bamboo were 0.22 GPa and 19.42 MPa, respectively. At the same time, mechanical stripping method was used to prepare tensile samples of bamboo vascular bundles. The tensile elastic modulus and strength are 33.9 GPa and 482.2 MPa, respectively. When the bamboo wall is under load, its basic structure plays the role of absorbing energy, and the vascular bundle plays the role of bearing and transmitting the load. At the same time, the bamboo joint plate is the reinforcing rib in the bamboo tube structure. Experiments show that the bamboo joint plate can increase the lateral bearing capacity of the bamboo tube by three times.

Proceeding from such background technology, the present invention aims at the deficiencies existing in the existing automobile B-pillar, and the design idea comes from the macroscopic and microscopic structure and function of bamboo, and designs a high-performance sectional automobile B-pillar imitating bamboo structure structure.

Contents of the invention

In order to overcome the defect that the existing automobile B-pillar structure is difficult to have high rigidity and good energy-absorbing characteristics at the same time, the present invention provides a segmented automobile B-pillar structure composed of multiple double-layer columnar tubes and joints. Strong rigidity, good energy absorption characteristics, and better safety.

The technical scheme provided by the invention is:

A segmented automobile B-pillar structure, comprising: a plurality of double-layer columnar tubes and columnar tube joints connected between the plurality of double-layer columnar tubes;

The double-layer cylindrical tube includes:

Octagonal inner tube;

an octagonal outer tube, which is sleeved outside the octagonal inner tube and parallel to the octagon of the inner tube;

a rib disposed between adjacent vertices of the inner tube and the outer tube along the vehicle transverse direction;

filler, which is filled between the inner tube and the outer tube;

The columnar pipe joint includes:

a connecting plate having an upper surface and a lower surface at an inclined angle;

an upper connecting part, which is arranged on the upper surface and has an octagonal annular accommodation space for matching and accommodating the double-layered columnar tube at the upper part;

The lower connecting part is arranged on the lower surface and has an octagonal annular accommodation space for matching and accommodating the double-layer columnar tube located at the lower part.

Preferably, both the inner tube and the outer tube are hollow structures whose cross-sectional dimensions gradually decrease from bottom to top.

Preferably, the cross-sections of the inner tube and the outer tube are both axisymmetric octagons, and the distance between a pair of opposite sides of the octagon along the front and rear direction of the car is greater than that of the octagon along the left and right sides of the car. A set of opposite-edge distances for directions.

Preferably, the columnar pipe joint has an integrated structure.

Preferably, the shape and area of the upper surface and the lower surface of the connecting plate are the same.

Preferably, the filler between the inner tube and the outer tube is aluminum foam.

Preferably, the sectional vehicle B-pillar structure further includes an upper joint, which is connected between the double-layer columnar tube and the upper beam of the vehicle door.

Preferably, the lower part of the upper joint has an octagonal annular accommodation space for matching and accommodating the double-layer cylindrical tube located at the lower part.

Preferably, the sectional vehicle B-pillar structure further includes a lower joint connected between the double-layer columnar tube and the vehicle door sill.

Preferably, the upper part of the lower joint has an octagonal annular accommodation space for matching and accommodating the double-layer columnar tube located at the upper part.

The beneficial effects of the present invention are: the segmented automobile B-pillar structure provided by the present invention is composed of multiple double-layer columnar pipes and joints, which has strong rigidity, good energy absorption characteristics, and better safety , Overcoming the defect that the existing automobile B-pillar structure is difficult to have high rigidity and good energy absorption characteristics at the same time.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the B-pillar structure of a sectional automobile according to the present invention.

Fig. 2 is a schematic diagram of the structure of a double-layer columnar tube according to the present invention.

Fig. 3 is a structural schematic diagram of a cylindrical pipe joint according to the present invention.

Fig. 4 is a schematic cross-sectional view of the cylindrical pipe joint according to the present invention along the longitudinal direction of the vehicle.

Fig. 5 is a schematic cross-sectional view of the cylindrical pipe joint according to the present invention along the transverse direction of the vehicle.

Fig. 6 is a schematic diagram of the structure of the upper joint according to the present invention.

Fig. 7 is a schematic diagram of the structure of the lower joint according to the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

As shown in Figures 1-7, the present invention provides a segmented automobile B-pillar structure. The sectional automobile B-pillar structure includes a plurality of double-layer cylindrical tubes 100, which include an octagonal inner tube 110; an octagonal outer tube 120, which is sleeved on the octagonal inner tube 110 outside and parallel to the octagon of the inner tube 110 ; and a filler 130 filled between the inner tube 110 and the outer tube 120 . Both the inner tube 110 and the outer tube 120 are cavity structures whose cross-sectional dimensions gradually decrease from bottom to top. The cross-sections of the inner tube 110 and the outer tube 120 are both axisymmetric octagons. The distance between a group of opposite sides of the octagon along the front and rear direction of the car is greater than the distance between a group of opposite sides of the octagon along the left and right directions of the car. Such a structure can make the space of the passenger compartment of the car larger when the overall width of the car is constant. . The filler 130 is made of foamed aluminum, which imitates the basic structure of energy absorption in the bamboo wall. The foamed aluminum has the advantages of low density and good energy absorption characteristics, and can absorb more collisions with a small weight gain. Energy, greatly improving the energy characteristics of the B-pillar, improving the safety of the car.

The reinforcing rib 140 imitates the vascular bundle structure in the bamboo wall that bears the load and transmits the force, and can improve the rigidity of the B-pillar of the automobile. The reinforcing rib 140 is disposed between the inner tube 110 and the outer tube 120 to connect the inner tube 110 and the outer tube 120 together. There are four reinforcing ribs 140, which are respectively arranged between the adjacent vertices of the inner layer tube 110 and the outer layer tube 120 along the transverse direction of the vehicle, so that the reinforcing ribs 140 distributed in this way can significantly strengthen the vehicle during a side collision. The bending resistance of the double-layer cylindrical tube, and the parts without ribs can be crushed and absorbed smoothly, so that the entire B-pillar of the car can be crushed along the transverse direction of the car, and the intrusion deformation of the passenger compartment can be reduced.

A plurality of columnar tube joints 200 are connected between the double-layered columnar tubes 100 . The cylindrical pipe joint 200 is an integral structure, including an upper connection part 210 , a lower connection part 220 , and a connection plate 230 located between the upper connection part 210 and the lower connection part 220 . The connecting plate 230 is a solid structure, and the connecting plate 230 is imitated as a transverse partition of bamboo joints, and has a certain thickness, which is used to increase the structural rigidity of the B-pillar. The connecting plate 230 has an upper surface and a lower surface with a certain inclined angle, so as to form the curvature and inclination of the B-pillar of the automobile. Since the B-pillar structure of the car is not a vertical structure, in order to match the overall structure of the car, the B-pillar structure of the car is inclined backward at a certain angle along the longitudinal direction of the car, with a certain inward curvature in the transverse direction of the car, and gradually shrinks inward from bottom to top. form an arch. The axis of the double-layer columnar pipe 100 is a straight line, so the slope and curvature of the above-mentioned B-pillar structure need to be adjusted by the columnar pipe joint 200 to complete.

The upper connecting part 210 of the cylindrical pipe joint 200 is composed of an inner plate 211 , an outer plate 212 and a connecting plate 230 to form an octagonal annular accommodation space 240 ; the lower connecting part 220 has the same structure as the upper connecting part 210 . One end of the double-layer columnar tube 100 is inserted into the octagonal annular accommodation space 240 and abuts against the connecting plate 230 . The lower end surface of the double-layer columnar tube 100 inserted into the annular accommodation cavity 240 of the upper connecting portion 210 is equal in shape and area to the upper surface of the corresponding connecting plate 230 , and the upper surface of the double-layer columnar tube 100 inserted into the annular accommodation cavity of the lower connecting portion 220 The shape and area of the lower surface of the end surface and its corresponding connecting plate 230 are equal, and the shape and area of the upper surface and the lower surface of the connecting plate 230 are equal, that is, two adjacent double-layer columnar pipes 100 are connected with the same cylindrical pipe joint 200 The size of the end faces of the two pillars is the same, so that the overall structure of the B-pillar shows a uniform change of the bottom big and the top small.

The upper joint 300 is connected between the double-layer columnar pipe 100 and the upper beam 510 of the automobile door. The lower part 310 of the upper joint, which has an octagonal annular accommodation space 330 formed by the inner plate 311 and the outer plate 312, is used to match and accommodate the double-layer columnar tube 100 located at the lower part; the shape and area of the bottom surface of the annular accommodation space 330 It is equal to the shape area of the upper end surface of the double-layer columnar tube 100 located below it. The upper joint upper part 320 connected with the upper door beam 510 is a solid structure. The shape of the upper joint upper part 320 matches the structural shape of the upper door beam 510 .

The lower joint 400 is connected between the double-layer columnar pipe 100 and the vehicle door sill beam 520 . The lower joint upper part 410 has an octagonal annular accommodation space 430 composed of the lower joint inner plate 411 and the lower joint outer plate 412, which is used to match and accommodate the double-layer columnar pipe 100 located at the upper part; the annular accommodation space 430 The shape and area of the bottom surface are consistent with the shape and area of the lower end surface of the double-layer columnar tube 100 located above it. The lower joint lower part 420 is a solid structure, which is connected with the rocker beam 520 .

The shape and thickness of the solid structure parts of the upper joint upper part 320 and the lower joint lower part 420 also adjust the inclination and camber of the B-pillar structure. The upper joint 300 and the lower joint 400 are respectively connected to the upper beam 510 of the automobile door and the sill beam 520 of the automobile door, because the joint structure of the B-pillar structure is similar to the slub part of bamboo, and the rigidity of the joint is greater than that of the double-layer columnar pipe structure. Improve the side collision safety of the car.

Combined with the specific implementation process, the sectional automobile B-pillar structure of the present invention will be further described.

In one embodiment, the B-pillar structure is composed of four double-layer columnar tubes 100 , three columnar tube joints 200 , an upper joint 300 and a lower joint 400 . The inner tube 110 and the outer tube 120 of the double-layer columnar tube 100 are formed by internal high-pressure molding of a conical tube to obtain an octagonal tube with a corresponding cross-sectional size from bottom to top, and then welded by laser, and four reinforcing ribs 140 are used to seal the tube. The inner tube 110 and the outer tube 120 are connected together, and four reinforcing ribs 140 are respectively arranged between adjacent vertices of the inner tube 110 and the outer tube 120 along the vehicle transverse direction. Finally, aluminum foam is used to fill the gap between the inner tube 110 and the outer tube 120 .

The cylindrical pipe joint 200, the upper joint 300 and the lower joint 400 are selected according to different B-pillar structures, and corresponding molds are designed with different sizes, and the die-casting manufacturing method is adopted.

Select the appropriate columnar pipe joint 200 and double-layer cylindrical pipe 100 to ensure that the end surface size of the double-layer cylindrical pipe 100 is consistent with the upper surface and lower surface of the connecting plate 230 of the corresponding cylindrical pipe joint 200; select the appropriate upper joint 300 and lower surface. The joint 400 ensures that the size of the end face of the double-layer columnar pipe 100 is consistent with the size of the bottom surface of the annular accommodation space corresponding to the upper joint 300 and the lower joint 400, and at the same time, ensures that the upper joint 300 matches the shape of the corresponding upper beam 510 of the automobile door; Positioning, assembling, clamping and connecting by laser welding from bottom to top.

After the overall welding of the B-pillar is completed, the side wall of the body-in-white is transferred for positioning and installation, and laser welding is used to weld the B-pillar structure with the vehicle door sill beam 520 and the vehicle door upper beam 510 to complete the installation of the B-pillar structure.

The segmented automobile B-pillar structure provided by the present invention is composed of a plurality of double-layered columnar tubes and joints, which not only has strong rigidity, but also has good energy absorption characteristics and better safety, and overcomes the existing automobile B-pillar structure. It is difficult for the column structure to have both high stiffness and good energy absorption characteristics.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (8)

1. A segmented automobile B-pillar structure, characterized in that it comprises: a plurality of double-layer columnar pipes and a columnar pipe joint connected between the plurality of double-layer columnar pipes; The double-layer cylindrical tube includes: Octagonal inner tube; an octagonal outer tube, which is sleeved outside the octagonal inner tube and parallel to the octagon of the inner tube; a rib disposed between adjacent vertices of the inner tube and the outer tube along the vehicle transverse direction; filler, which is filled between the inner tube and the outer tube; The columnar pipe joint includes: a connecting plate having an upper surface and a lower surface at an inclined angle; an upper connecting part, which is arranged on the upper surface and has an octagonal annular accommodation space for matching and accommodating the double-layered columnar tube at the upper part; The lower connecting part, which is arranged on the lower surface and has an octagonal annular accommodation space, is used to match and accommodate the double-layer cylindrical tube located at the lower part; Wherein, the cross-sections of the inner tube and the outer tube are both axisymmetric octagons, and the distance between a group of opposite sides of the octagon along the front and rear directions of the car is greater than the distance between the sides of the octagon along the left and right directions of the car. the distance of a set of opposite sides; The columnar pipe joint has an integrated structure. 2. The sectional B-pillar structure of an automobile according to claim 1, wherein the inner tube and the outer tube are both hollow structures whose cross-sectional dimensions gradually decrease from bottom to top. 3. The sectional vehicle B-pillar structure according to claim 1, wherein the shape and area of the upper surface and the lower surface of the connecting plate are the same. 4. The sectional automobile B-pillar structure according to claim 1, characterized in that the filler between the inner tube and the outer tube is aluminum foam. 5. The sectional vehicle B-pillar structure according to claim 1, further comprising an upper joint connected between the double-layer columnar tube and the upper beam of the vehicle door. 6 . The sectional vehicle B-pillar structure according to claim 5 , wherein the lower part of the upper joint has an octagonal annular accommodation space for matching and accommodating the double-layer columnar tube located at the lower part. 7 . 7. The sectional vehicle B-pillar structure according to claim 1, further comprising a lower joint connected between the double-layer columnar tube and the vehicle door sill. 8. The sectional vehicle B-pillar structure according to claim 7, characterized in that, the upper part of the lower joint has an octagonal annular accommodation space for matching and accommodating the double-layered columnar tube located at the upper part.

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