KR20210067396A - Bumper beam system for vehicles - Google Patents

Abstract

The present invention relates to a bumper beam system for a vehicle. The bumper beam system for the vehicle of the present invention may comprise: a bumper beam made of a plastic composite material; a groove unit disposed inside the bumper beam and extending in the longitudinal direction; and a buffer reinforcement disposed in the groove unit. An object of the present invention is to provide the bumper beam system for the vehicle with improved rigidity and strength.

Description

Automotive bumper beam system {BUMPER BEAM SYSTEM FOR VEHICLES}

The present invention relates to a bumper beam system for a vehicle, and more particularly, to a bumper beam system for a vehicle capable of improving the rigidity and strength of the bumper beam and preventing the bumper beam from breaking.

BACKGROUND ART In general, bumpers are mounted on the front and rear of a vehicle body to absorb an impact force generated during a collision to protect the vehicle and passengers.

The bumper is composed of a bumper cover forming an outer surface and a bumper beam to which an impact is transmitted through the bumper cover. The bumper beam is to cushion the impact transmitted to the vehicle, and when the impact force is large, the impact force is effectively buffered. When it is deformed and the impact force is small, it serves to minimize the amount of deformation.

Bumper beams that are actually used are required to satisfy the tests of non-life insurance companies (RCAR, IIHS), which are legal low-speed collisions and compliance items. In addition, low-speed collisions are divided into North America (Canada), North America (USA), Korea, and China depending on the automobile sales region. For example, the performance required for low-speed collisions in North America (Canada) is higher than in other regions. Requires high strength requirements.

Due to these requirements, most of the bumper beams that satisfy the low-speed impact performance of the high-required law, such as in North America (Canada), use products made of steel, aluminum, and press-formed composite materials.

However, when the front part of the bumper beam is formed of a steel material, there is an advantage that a predetermined rigidity can be secured, but since the weight of the vehicle increases, the fuel efficiency is adversely affected, and the impact force is lowered due to the nature of the steel material. There was a problem in that it was delivered to the passengers as it is.

In order to overcome this problem, a bumper beam made of a plastic composite has been disclosed. As the bumper beam is made of a plastic composite material, the weight reduction of the vehicle equipped with the bumper beam can be achieved, but the rigidity sufficient to cushion the impact is not secured, so there is a problem that it is not suitable for a cushioning role of the vehicle.

Korean Patent Registration No. 10-1365057 proposes a bumper beam for automobiles in which a steel reinforcement member is mounted on a bumper beam of a plastic composite material (hereinafter referred to as 'Patent Document 1'). This patent document 1 is characterized in that the bumper beam composed of the front part and the upper and lower support parts is made of a plastic composite material, a groove part is recessed in the vertical direction center part of the front part part, and a steel reinforcement member is mounted in the groove part. . However, in recent years, the cost is reduced by removing the energy absorber positioned in front of the bumper beam, and when mass-producing the bumper beam for a vehicle, it is difficult to match the shape with the bumper cover with the above configuration, so there is a problem that it must be individually matched.

Republic of Korea Patent Registration No. 10-1327016 proposes a crash box capable of absorbing collision energy while the internal space is sequentially collapsed upon impact (hereinafter referred to as 'Patent Document 2'). This patent document 2 is characterized in that by placing a plurality of shock absorbing spaces therein, the sequential collapse of the shock absorbing space is induced by collision energy generated during an accident. However, in Patent Document 2, since a plurality of accessories are inevitably added to fasten the crash box and the vehicle body, there is a limit to reducing the weight of the entire bumper beam.

In recent years, the basic weight of a vehicle is continuously increasing due to the enlargement of automobiles and the expansion of electric vehicles, but due to the change in the appearance of the automobile, the permissible penetration of a collision body required by commercial properties and laws is decreasing. In particular, it is more difficult to satisfy the standard of penetration allowance in the rear bumper with a short bumper length. Therefore, in a bumper beam made of a plastic composite, a bumper beam structure for automobiles having a low permissible penetration capacity is required.

It is an object of the present invention to provide a bumper beam system for automobiles with improved rigidity and strength while maintaining the weight reduction of the bumper beam made of a plastic composite material as much as possible.

For this purpose, the bumper beam system for a vehicle of the present invention is a bumper beam and a cushioning reinforcement for maximizing the rigidity of the entire bumper beam while suppressing the initial deformation of the cushioning reinforcement is inserted into the bumper beam made of a plastic composite material. It is assumed that it is based on a combination structure.

The present invention for solving the above problems is a bumper beam system for a vehicle, comprising: a bumper beam made of a plastic composite material; a groove portion disposed inside the bumper beam and extending in the longitudinal direction; and a cushioning reinforcing material disposed in the groove portion.

According to an embodiment of the present invention, the groove portion is formed surrounded by at least a portion of a flange portion forming one surface of the bumper beam, and a plurality of web portions protruding from the flange portion and extending in the longitudinal direction of the bumper beam, The cushioning reinforcement may be located inside the groove portion.

According to an embodiment of the present invention, the web portion includes a first web portion formed on the rear side connected to the vehicle body, and a second web portion formed between the front portion and the first web portion, wherein the first and second The web portion may protrude from a flange portion forming one surface of the bumper beam and extend in a longitudinal direction of the bumper beam.

According to an embodiment of the present invention, further comprising a support flange portion extending in a longitudinal direction of the bumper beam parallel to the flange portion from the second web portion, the groove portion is the flange portion, the second web portion, and It may be formed by the support flange part.

According to an embodiment of the present invention, the cushioning reinforcement may be made of a hollow metal material.

According to an embodiment of the present invention, the cross-section of the cushioning reinforcement may be any one of a square, a circle, an oval, or an H-shaped shape.

According to the present invention, it is possible to improve the rigidity and strength of the bumper beam and prevent the bumper beam from breaking.

In addition, while achieving light weight due to the bumper beam made of plastic composite material, it is possible to suppress the initial deformation of the cushioning reinforcement through the combination structure with the metal cushioning reinforcement, while maximizing the overall rigidity of the bumper beam and achieving low penetration. make it possible

1 is a cross-sectional view of a part of a bumper beam system for a vehicle according to a first embodiment of the present invention as viewed from the upper side of the vehicle.
2 is a top view of a part of a bumper beam system for a vehicle according to a first embodiment of the present invention as viewed from the upper side of the vehicle.
3 is a side cross-sectional view of the bumper beam system for a vehicle of FIG. 2 according to the first embodiment of the present invention.
4 is a top view of a part of a bumper beam system for a vehicle according to a second embodiment of the present invention as viewed from the upper side of the vehicle.
5 is a side cross-sectional view of the bumper beam system for a vehicle of FIG. 4 according to a second embodiment of the present invention.

Hereinafter, detailed contents for carrying out the present invention will be described with reference to the accompanying drawings. In the description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured as it is obvious to those skilled in the art with respect to related known functions, the detailed description thereof will be omitted.

In this specification, the front or rear of the bumper beam or bumper beam system refers to the side on which another vehicle collides the front, and the side attached to the vehicle body is referred to as the rear, which should be interpreted as the meaning of the front or rear of the vehicle. no.

1 is a cross-sectional view of a part of a bumper beam system for a vehicle according to a first embodiment of the present invention as viewed from the upper side of the vehicle.

Referring to FIG. 1 , the bumper beam system for a vehicle according to the present invention includes a bumper beam 10 , a groove 20 , and a cushioning reinforcement 30 .

The bumper beam 10 is formed long in the width direction of the vehicle and is made of a plastic composite material. At this time, the bumper beam 10 may have a curved profile of an arc shape in which the front of the middle portion is convex, and it is possible to distribute the impact force when another vehicle collides. However, the rear of the bumper beam 10 is a part coupled to the vehicle body by a connecting member such as a bracket, and may extend horizontally along the longitudinal direction of the bumper beam 10 .

A plurality of partitioned empty spaces may be formed inside the bumper beam 10 to allow a certain amount of penetration by other vehicles in the event of a collision, and a plurality of partitioned empty spaces may be formed to partition the empty space and have a predetermined height to alleviate impact force. A partition member may be formed. The plurality of partition members may extend in any direction, such as a width direction or an inclined direction of the bumper beam 10 having different directions. Meanwhile, a cover (not shown) for preventing the bumper beam 10 from being exposed to the outside may be vertically coupled to the bumper beam 10 .

The groove 20 is disposed inside the bumper beam 10 and extends in the longitudinal direction. The groove 20 may be formed in a groove shape along the longitudinal direction of the bumper beam 10 so that the cushioning reinforcement 30 can be inserted thereinto. In addition, the groove 20 may extend over most of the longitudinal direction except for both ends of the bumper beam 10 . However, the arrangement of the groove portion 20 is not limited thereto, and for example, other vehicles such as disposed in a part of the longitudinal direction of the bumper beam 10 or disposed in a plurality of layers are placed in front of the bumper beam 10 . Any arrangement capable of buffering the impact force against it is possible.

However, in order to fit the cushioning reinforcement 30 over the entire longitudinal direction of the groove portion 20, the groove portion 10 is to be disposed at the rear of the bumper beam 10 extending horizontally along the longitudinal direction of the bumper beam 10. can

The buffer reinforcing material 30 is accommodated in the longitudinal direction inside the groove portion 20 and may be made of a metal material. However, it is not limited to a metal material, and any material having a rigidity equivalent to that of a metal material may be used. In addition, the cushioning reinforcement 30 may be in the shape of a metal rod made of a hollow type. In this case, as described above, the groove 20 is made horizontally along the longitudinal direction. However, the present invention is not limited thereto, and a shape in which the cushioning reinforcement 30 is curved in a bow shape is also possible, and in this case, the groove 20 may also have a shape curved toward the front of the bumper beam 10 .

In this case, since the cushioning reinforcing material 30 is received in the longitudinal direction inside the groove portion 20 , that is, the cushioning reinforcing material 30 is disposed inside the bumper beam 10 without protruding outward. Accordingly, shape matching between the bumper beam 10 and the bumper cover is facilitated.

In addition, the cushioning reinforcement 30 may be injection-molded integrally with at least a portion of the bumper beam 10 . For example, while inserting the cushioning reinforcement 30 into the injection mold, the bumper beam 10 and the cushioning reinforcement 30 are integrally injection molded while the bumper beam 10 is brought into contact with the cushioning reinforcement 30. can

Furthermore, the cross-section of the cushioning reinforcement 30 may be formed in any one shape of a quadrangle, a circle, an oval, or an H-shaped having a high moment of inertia relative to the weight. In addition, at least one hollow may be formed in the cross section of the cushioning reinforcement 30 . That is, the shape of the cushioning reinforcing material 30 may be formed in a shape suitable for minimizing penetration and weight by other vehicles.

On the other hand, when the cushioning reinforcement 30 is disposed at the rear of the bumper beam 10, an empty space that allows a certain amount of penetration by other vehicles in a collision may be formed in front of the bumper beam 10. In addition, since the cushioning reinforcement 30 is made of a rigid metal material and can have a shape such as a hollow inside at the same time, it is possible to prevent the overall initial deformation of the cushioning reinforcement 30 while minimizing the permissible penetration by other vehicles. . In addition, since it is accommodated in the longitudinal direction inside the groove portion 20, it is possible to prevent, for example, breakage of the bumper beam in a rear high-speed collision.

2 is a top view of a part of a bumper beam system for a vehicle according to a first embodiment of the present invention as viewed from the upper side of the vehicle. In addition, FIG. 3 is a side cross-sectional view of the bumper beam system for a vehicle of FIG. 2 viewed from the side.

1 and 2 , the bumper beam 10 of the bumper beam system for a vehicle according to the first embodiment of the present invention includes a flange portion 14 and web portions 12 and 13 .

The flange portion 14 may form one surface of the bumper beam 10 . The flange portion 14 may be formed to partition an approximately middle portion of the bumper beam 10 , and may also be formed in the shape of a bottom surface opened up and down.

The web portions 12 and 13 may be plural, and the first web portion 12 formed on the rear side connected to the vehicle body, and the front portion 11 and the first web portion formed on the front side of the bumper beam 10 . It may include a second web portion 13 formed between (12). The front portion 11, the first and second web portions 12 and 13 may be formed to extend with a predetermined height to one side or both sides in a vertical direction with the flange portion 14 interposed therebetween.

The front part 11 may be formed on the front side of the bumper beam 10 . In this specification, the front side of the bumper beam 10 means one side of the bumper beam 10 facing the outside of the vehicle and in a direction in which another vehicle collides. When the front of the bumper beam 10 has a convex arc shape, the front part 11 may also have a convex arc shape and form a front side surface of the front bumper beam 10 . At this time, the front part 11 may protrude from the flange part 14 forming one surface of the bumper beam 10 and extend along the longitudinal direction of the bumper beam 10 .

The first web part 12 may be formed at a rear side connected to the vehicle body. When extending horizontally along the longitudinal direction of the bumper beam 10, the first web portion 12 also extends horizontally along the longitudinal direction and may form a rear side surface of the rear bumper beam 10. In this case, the first web part 12 may protrude from the flange part 14 forming one surface of the bumper beam 10 and extend along the longitudinal direction of the bumper beam 10 .

The second web part 13 may be formed between the front part 11 and the first web part 12 . In this case, the second web part 13 may protrude from the flange part 14 forming one surface of the bumper beam 10 and extend along the longitudinal direction of the bumper beam 10 . In addition, the second web part 13 may be spaced apart from the front part 11 and the first web part 12 by a predetermined interval, and a groove part 20 in which the cushioning reinforcement 30 is disposed between the first web part 12 and the first web part 12 . ) can be formed.

Accordingly, the groove 20 may be formed to extend between the first web part 12 and the second web part 13 , for example, in parallel with the first web part 12 . At the same time, the second web part 13 may form an empty space between the front part 11 and the front part 11 to allow a certain amount of penetration by other vehicles in the event of a collision.

That is, the first web part 12 and the second web part 13 not only perform a function of forming a space for accommodating the buffer reinforcement 30 , but also protect the buffer reinforcement 30 while protecting the buffer reinforcement 30 . together with the effect of maximizing the rigidity of the bumper beam.

In addition, the bumper beam system for a vehicle according to an embodiment of the present invention may further include a vehicle body connection bracket (40). The vehicle body connection bracket 40 may be connected to a position in contact with the cushioning reinforcement 30 at the longitudinal end side of the bumper beam 10 . The vehicle body connection bracket 40 serves to mount the bumper beam 10 to the vehicle body. In addition, the vehicle body connection bracket 40 may be injection-molded integrally with the bumper beam 10 .

The groove part 20 protrudes from the flange part 14 and extends along the longitudinal direction of the bumper beam 10 . In addition, the groove portion 20 may be formed surrounded by at least a portion of the flange portion 14 and the plurality of web portions 12 and 13 . The cushioning reinforcement 30 may be positioned inside the groove 20 so as not to protrude to the outside of the bumper beam 10 . In this case, the groove portion 20 may be configured such that the flange portion 14 forms a bottom surface, and at least a portion of the plurality of web portions 12 and 13 forms a side surface.

In addition, the flange portion 14 and the web portions 12 and 13 may form an 'H-shaped' shape. However, the flange portion 14 and the web portions 12 and 13 may have an 'H-shaped' shape as well as any shape in which one side is opened so that the groove portion 20 can be formed.

In this case, the groove portion 20 may be located on one side of the flange portion 14 . For example, the groove part 20 may be located below the bottom surface of the flange part 14 . In this case, the groove portion 20 may be formed with the flange portion 14 as one surface and at least a portion of the web portions 12 and 13 as the side surface. However, the present invention is not limited thereto, and the groove portion 20 may be located in any space formed by the flange portion 14 and the web portions 12 and 13 .

By accommodating the buffer reinforcement 30 in such a groove 20, the peeling phenomenon between the buffer reinforcement 30 made of a metal material and the groove portion 20 formed as a part of the bumper beam 10 made of a plastic composite material can be minimized. have.

3 is a side cross-sectional view of the bumper beam system for a vehicle of FIG. 2 according to the first embodiment of the present invention.

2 and 3 , the groove portion 20 may be formed by the flange portion 14 and the first and second web portions 12 and 13 . In this case, the first and second web portions 12 and 13 may protrude upward and downward of one surface of the flange portion 14 with the flange portion 14 interposed therebetween.

At this time, the cushioning reinforcement 30 may be accommodated in the groove 20 formed of, for example, at least one web portion 12 , 13 and the flange portion 14 on the lower side of one surface of the flange portion 14 . At this time, an opening may be formed in the groove portion 20 on the opposite side to one surface of the flange portion 14 , and the cushioning reinforcement 30 may be accommodated in the groove portion 20 through the opening.

In addition, the front portion 11 of the bumper beam, and the first and second web portions 12 and 13 may be arranged to be spaced apart from each other in parallel in the width direction of the bumper beam 10 . When an impact from another vehicle is applied to the bumper beam system for a vehicle according to the present invention from the front, an impact force is first received from the front part 11 of the bumper beam, and the impact force is the front part 11 and the first web part 12 After allowing a certain amount of penetration in the space therebetween and after being relieved, it may be buffered by the buffer reinforcement 30 positioned between the first web part 12 and the second web part 13 .

Furthermore, the hollow formed in the cushioning reinforcement 30 can maximize the cushioning role. At the same time, the cushioning reinforcing material 30 is made of a rod shape formed of a rigid material such as metal, so that it is possible to minimize the total penetration by other vehicles.

Hereinafter, a second embodiment according to the present invention will be described. However, the basic configuration of the first embodiment can be commonly applied to the second embodiment. Hereinafter, the configuration of the second embodiment that is different from the first embodiment will be mainly described.

4 is a top view of a part of a bumper beam system for a vehicle according to a second embodiment of the present invention as viewed from the upper side of the vehicle. In addition, FIG. 5 is a side cross-sectional view of the bumper beam system for a vehicle of FIG. 4 according to a second embodiment of the present invention.

4 and 5, the bumper beam system for a vehicle according to the present invention is a support flange portion extending along the longitudinal direction of the bumper beam 10 parallel to the flange portion 14 from the second web portion 13 ( 15) may be further included. In this case, the groove portion 20 may be formed by the flange portion 14 , the second web portion 13 , and the support flange portion 15 .

In addition, the second web part 13 , the flange part 14 , and the support flange part 15 may form a 'C' shape in which the flange part 14 and the support flange part 15 face each other. However, the support flange portion 15 may extend not only from the second web portion 13 but also from any other portion of the bumper beam 10 such as, for example, the first web portion 12 as described above.

At this time, the first web portion 12 may form an opening between the flange portion 14 and the support flange portion 15 so as not to extend in a portion facing the second web portion 13 , and the cushioning reinforcement 30 . may be accommodated in the groove 20 through the opening.

Meanwhile, the side cushioning material 41 performing a cushioning function may be accommodated in the vehicle body connection bracket 40 . The side cushioning material 41 may be made of, for example, a metal material. In addition, a portion of the side of the cushioning reinforcement 30 may be configured to be in contact with the side cushioning material 41 . The first web portion 12 is a portion to which the connection bracket 40 is connected so that the cushioning reinforcement 30 accommodated in the groove 20 and the side cushioning material 41 accommodated in the connection bracket 40 come into contact with each other. A through space may be formed in the That is, a part of the cushioning reinforcement 30 and the side cushioning material 41 may contact each other in this through space. Accordingly, the side cushioning material 41 can relieve the shock applied to the cushioning reinforcement 30 from the side of the vehicle while fixing the cushioning reinforcement 30 .

According to the various embodiments of the present invention described above, the present invention can improve the rigidity and strength of the bumper beam and prevent the bumper beam from breaking. In particular, it is possible to achieve weight reduction due to the plastic composite bumper beam and to maximize the rigidity of the bumper beam while suppressing the initial deformation of the buffer reinforcement through the combination structure of the metal cushioning reinforcement, and low penetration even in the plastic composite bumper beam. make it possible to achieve

The scope of protection in this field is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

10: bumper beam 11: front part
12: first web unit 13: second web unit
14: flange portion 15: support flange portion
20: groove 30: cushioning reinforcement
40: body connection bracket 41: side cushioning material

Claims (6)

Bumper beam made of plastic composite material;
a groove portion disposed inside the bumper beam and extending in the longitudinal direction; and
Bumper beam system for a vehicle, characterized in that it comprises a cushioning reinforcement disposed in the groove portion.
According to claim 1,
The groove portion is formed surrounded by at least a portion of a flange portion forming one surface of the bumper beam, and a plurality of web portions protruding from the flange portion and extending in the longitudinal direction of the bumper beam, and the cushioning reinforcement is inside the groove portion. Characterized in that it is located, a bumper beam system for a vehicle.
3. The method of claim 2,
The web portion includes a first web portion formed on the rear side connected to the vehicle body, and a second web portion formed between the front portion and the first web portion,
The first and second web portions protrude from a flange portion constituting one surface of the bumper beam and extend along the longitudinal direction of the bumper beam, a bumper beam system for a vehicle.
4. The method of claim 3,
Further comprising a support flange portion extending in the longitudinal direction of the bumper beam parallel to the flange portion from the second web portion,
The groove portion is characterized in that formed by the flange portion, the second web portion, and the support flange portion, a bumper beam system for a vehicle.
According to claim 1,
The cushioning reinforcement is a bumper beam system for a vehicle, characterized in that made of a hollow metal material.
According to claim 1,
The cross section of the cushioning reinforcement is a square, circular, oval, or H-shaped, characterized in that any one of the shape, the bumper beam system for automobiles.

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