KR101906835B1 - Bumper beam for vehicle - Google Patents

Abstract

A body portion extending in the longitudinal direction; A chamber portion formed integrally with the body portion on both sides of the body portion and formed in a forwardly protruding shape and having a shape corresponding to a protruding shape and having an inner space opened rearward; And a reinforcing portion filled in the inner space and connected to the inner surface of the chamber portion forming the inner space so as to be in contact with the inner surface of the chamber portion.

Description

BUMPER BEAM FOR VEHICLE

The present invention relates to a vehicle bumper beam capable of effectively responding to a collision of a vehicle by filling a reinforcing portion in an inner space provided on both sides.

The bumper beam is mounted on the front or rear of the vehicle body to minimize the damage to the vehicle body due to impact energy transmitted when the vehicle collides with the vehicle, thereby assuring passenger safety. In Europe, the regulations for such bumper beams are very strict, such as the RCAR barrier test, which tests how bumper beams absorb impact energy effectively and respond to collisions.

Therefore, research on bumper beams for vehicles satisfying RCAR performance is required.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

Patent Document 10-2015-0104902

An object of the present invention is to provide a vehicle bumper beam capable of effectively accommodating a collision of a vehicle by filling a reinforcing portion in an inner space provided on both sides.

According to an aspect of the present invention, there is provided a vehicle bumper beam including: a body portion extending in a longitudinal direction; A chamber portion formed integrally with the body portion on both sides of the body portion and formed in a forwardly protruding shape and having a shape corresponding to a protruding shape and having an inner space opened rearward; And a reinforcing portion filled in the inner space and connected to the inner surface of the chamber portion forming the inner space.

And a rib portion protruding from the inner surface of the chamber portion and contacting the reinforcing portion.

Wherein the inner surface of the chamber portion includes a front surface region protruding forward; Both side regions bending back from both ends of the front region; And upper and lower regions bent rearward from upper and lower ends of the front region and connected to the opposite side regions.

Wherein the rib portion is integrally connected to the front region and includes a first axis extending to both sides and a second axis crossing the first axis and extending up and down; A pair of side ribs extending rearward from the first axis and integrally connected to the both side regions; And a top and bottom ribs extending rearward from the second axis and integrally connected to the top and bottom regions.

Wherein the outer surface of the reinforcing portion is a first surface area provided with a first groove recessed in a shape corresponding to the front rib and abutting on the front area and the front rib, A second surface region provided with a second groove extending rearward from both ends of the first groove and contacting the both side regions and the side ribs; And a third surface region provided with a third groove extending rearwardly from upper and lower ends of the first groove and contacting the upper and lower surface regions and the upper and lower ribs.

Wherein the reinforcing portion comprises: a front member formed of a foam having a predetermined expansion ratio; And a rear member connected to a rear end of the front member and formed of a foam having a lower expansion ratio than the front member.

The reinforcing portion includes an inner member formed of a foam having a predetermined expansion ratio; And an outer member which is connected to surround the inner member and is formed of a foam having a lower expansion ratio than the inner member.

Wherein the outer member is formed with a rib groove recessed to correspond to the shape of the rib portion, the outer member is connected to the inner surface of the chamber portion and the rib portion so that the rib portion is protruded, May be shorter than the thickness of the outer member.

And an inner surface of the chamber portion is bent from an end of the both side surface regions and an end of the upper and lower surface regions and is opposed to the front surface region and connected to the reinforcing portion so as to be in contact with each other, .

A method for manufacturing a bumper beam for a vehicle according to the present invention includes: a first molding step of molding a reinforcing portion by foaming a foamed resin material; An inserting step of disposing the reinforcing portion inside the first mold; And a body portion extending in the longitudinal direction through resin injection into the first metal mold and a body portion connected to both sides of the body portion integrally with the body portion and formed in a forwardly protruding shape, And a second forming step of forming a chamber part having an inner space enclosing the reinforcing part as a shape.

Wherein the first molding step is integrally connected to a front member formed of a foam having a predetermined expansion ratio through injection of foamed resin into different injection ports formed in the second mold and a rear end of the front member, It is possible to form the reinforcing portion composed of the rear member formed of the foam having the expansion ratio.

Wherein the first forming step comprises: a first forming step of forming an inner member formed of a foam having a predetermined expansion ratio through injection molding of a resin into a third mold; Inserting the inner member into the fourth mold; And a second molding step of molding an outer member connected with the inner member through the injection of a foaming resin into the fourth mold and formed of a foam having a foaming magnification lower than that of the inner member, .

According to the bumper beam for a vehicle according to the present invention as described above, the reinforcing portion is filled in the inner space provided on both sides, so that it is possible to effectively cope with the collision of the vehicle.

The outer surface of the reinforcing portion is connected to the inner surface of the chamber portion and the rib portion so as to effectively absorb the impact energy.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a view of a bumper beam for a vehicle according to an embodiment of the invention.
2 is a cross-sectional view of a chamber portion and a reinforcement disposed in the interior space according to an embodiment of the present invention.
3 illustrates an inner surface and a rib portion of a chamber portion according to an embodiment of the present invention.
4 is a view of a reinforcement according to an embodiment of the present invention.
5 is a view showing a reinforcing part composed of a front member and a rear member according to an embodiment of the present invention.
6 is a view of a reinforcement comprising an inner member and an outer member according to one embodiment of the present invention.
FIG. 7 is a chart comparing loads and deformation amounts of CASEs according to an embodiment of the present invention; FIG.
8 is a chart comparing internal energies of CASEs according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1, the vehicle bumper beam according to the present invention includes a body portion 100 extending in the longitudinal direction; The inner space 10 is formed integrally with the main body 100 on both sides of the main body 100 and is formed in a forwardly protruding shape and has a shape corresponding to the protruded shape, A chamber part 200; And a reinforcing part 300 filled in the inner space 10 and connected to the inner surface 210 of the chamber part forming the inner space 10.

The body portion 100 has a shape extending in the longitudinal direction. Here, the longitudinal direction may be a direction corresponding to the width direction of the vehicle when the vehicle bumper beam is mounted on the vehicle body. The chamber part 200 formed on both sides of the body part 100 is formed integrally with the body part 100. Each of the chamber portions 200 on both sides of the main body 100 is formed to protrude forward. In addition, the inner space 10 of the chamber part 200 is formed, and the inner space 10 is formed in a shape corresponding to the protruded shape and the rear part is opened

The body part 100 and the chamber part 200 are integrally formed in the shape of a bumper beam. The main body part 100 and the chamber part 200 are formed of the same material and can be formed by injection molding. The main body part 100 and the chamber part 200 can be formed by injection molding and can be made of a long fiber reinforced composite material (G-LFT), polypropylene (PP), polycarbonate (PC), polybutylene terephthalate PBT), thermoplastic olefin (TPO), polyamide (PA), or the like. However, the present invention is not limited thereto.

The reinforcing part 300 is filled in the inner space 10 of the chamber part 200 and may be connected to the inner surface of the inner space 10 so as to be in contact with the inner surface. The reinforcing part 300 is disposed in the inner space 10 of the chamber part 200 and may be deformed along with the deformation of the chamber part 200 when the vehicle collides with the vehicle to absorb impact energy. In addition, it can play a role of supporting more deformation than a certain degree to prevent further deformation.

Preferably, the reinforcing portion 300 is made of expanded resin material such as Expanded Poly-Propylene (EPP).

2, which is a cross-sectional view taken along line A-A of FIG. 1, the rib portion 400 may protrude from the inner surface 210 of the chamber portion to be in contact with the reinforcing portion 300.

The rib portion 400 is formed integrally with the chamber portion 200 on the inner surface of the inner space 10 of the chamber portion 200. And is connected to the outer surface 310 of the reinforcing portion so as to protrude from the inner surface of the inner space 10. The rigidity of the vehicle bumper beam according to the present invention can be increased and the coupling force between the inner space 10 and the chamber part 200 can be increased.

As shown in FIG. 3, the inner surface 210 of the chamber part preferably includes a front surface area 211 protruding forward; Both side regions 212 bending backward from both ends of the front region 211; And upper and lower regions 213 folded rearward from upper and lower ends of the front region 211 and connected to the both side regions 212.

The front region 211 refers to a portion protruding forward most from the inner surface forming the inner space 10. [ In the case of both side surface regions 212, the chamber portion 200 extends rearward to the extent that the chamber portion 200 protrudes from both ends of the front region 211 toward the rear. The top and bottom regions 213 extend rearward from the upper and lower ends of the front region 211 to the extent that the chamber portion 200 protrudes from the upper and lower ends of the front region 211 and are connected to both side regions 212.

Whereby the inner space 10 formed by the inner surface 210 of the chamber part can be formed into a virtual hexahedral shape.

Preferably, the rib portion 400 is integrally connected to the front region 211 and includes a first axis 411 extending to both sides, a second axis 411 intersecting the first axis 411, A front rib 410 configured as an axis 412; Both side ribs 420 extending rearward from the first shaft 411 and integrally connected to the both side regions 212; And a top and bottom ribs 430 extending rearward from the second shaft 412 and integrally connected to the top and bottom regions 213.

The front ribs 410 protrude rearward from the front surface area 211 of the inner surface 210 of the chamber part. Also, the front ribs 410 and the front region 211 are connected to the reinforcing portion 300 to be in contact with each other. The first axis 411 constituting the front rib 410 extends to both sides and the second axis 412 has a shape in which the center intersects the center of the first axis 411 and extends vertically. Accordingly, the front rib 410 is formed in a cross shape.

Both side ribs 420 protrude from opposite side regions 212 of the inner surface 210 of the chamber portion toward each other. Both side ribs 420 and both side regions 212 are connected to the reinforcing portion 300 so as to be in contact with each other. And extends rearward along both side regions 212 from the end of the first axis 411. [

The upper and lower surface ribs 430 protrude from the upper and lower surface regions 213 of the inner surface 210 of the chamber portion facing each other. The upper and lower ribs 430 and the upper and lower regions 213 are connected to the reinforcing portion 300. And extends rearward along the upper and lower surface regions 213 from the end of the second shaft 412.

4, the outer surface 310 of the reinforcing portion may include a first groove 20 formed in a shape corresponding to the front rib 410 to contact the front surface region 211, 211) and a first surface region (311) in contact with the front rib (410); A second surface area 312 provided with a second groove 30 extending rearward from both ends of the first groove 20 and in contact with the both side surfaces 212 and the both side ribs 420; And a third surface region 313 provided with a third groove 40 extending rearwardly from the upper and lower ends of the first groove 20 and contacting the upper and lower regions 213 and the upper and lower ribs 430, can do.

The first surface area 311 is formed in the first surface area 311 so as to be connected to the front surface area 211 formed in the front surface area 211 so as to be in contact with the front surface area 211 of the inner surface of the chamber part 200 The first groove 20 is formed in a shape corresponding to the shape of the front rib 410.

The second surface area 312 is formed in the second surface area 312 so as to be connected to the both side ribs 420 formed in the both side surface areas 212 as a part of the inner surface of the chamber part 200, A second groove 30 is formed in a shape corresponding to the shape of the both side ribs 420. And in the case of the second groove 30, it extends rearward from both ends of the first groove 20.

The third surface area 313 is formed in the third surface area 313 so as to be connected to the upper and lower surface ribs 430 formed in the upper and lower surface areas 213 as a part of the inner surface of the chamber part 200, A third groove 40 is formed in a shape corresponding to the shape of the upper and lower ribs 430. And in the case of the third groove 40, it extends rearward from the upper and lower ends of the first groove 20.

As such, the reinforcing portion 300 may have a shape corresponding to the inner space 10 of the chamber portion 200 and may have a hexahedral shape.

As shown in FIG. 5, the reinforcing part 300 preferably includes a front member 320 formed of a foam having a predetermined expansion ratio; And a rear member 330 connected to a rear end of the front member 320 and formed of a foam having a lower expansion ratio than the front member 320.

The front member 320 positioned in front of the reinforcing portion 300 may function to absorb impact energy when the vehicle collides. And may be formed of a foam having a predetermined expansion ratio so as to be deformed together with the chamber part 200. Here, the predetermined foaming magnification may be 8 to 15 times.

The rear member 330 connected to the rear end of the front member 320 so as to be positioned rearward of the reinforcing member 300 may be formed as a foam having a lower expansion ratio than the front member 320 so as to prevent further deformation . Which is lower than the predetermined foaming magnification of 8 to 15 times.

That is, the front member 320 is primarily deformed together with the chamber part 200 to absorb the impact energy, and the rear member 330 prevents the deformation due to the remaining impact energy, thereby coping with the collision.

As shown in FIG. 6, the reinforcing part 300 preferably includes an inner member 340 formed of a foam having a predetermined expansion ratio; And an outer member 350 connected to wrap around the inner member 340 and formed of a foam having a lower expansion ratio than the inner member 340.

The inner member 340 located on the inner side in the reinforcing portion 300 may function to absorb impact energy when the vehicle collides. And may be formed of a foam having a predetermined expansion ratio. Here, the predetermined foaming magnification may be 8 to 15 times.

The outer member 350 connected to surround the inner member 340 so as to be located on the outer side of the reinforcing portion 300 is formed as a foam having a lower expansion ratio than the inner member 340 so as to prevent the deformation by the impact energy . Which is lower than the predetermined foaming magnification of 8 to 15 times.

That is, when the outer member 350 connected to the inner surface 210 of the chamber part supports the chamber part 200 from the inside as much as possible at the time of the collision to prevent the deformation due to the impact energy, And deformation occurs together with the inner member 340 to cope with the collision in such a way as to absorb the impact energy.

More preferably, the outer member 350 is formed with a rib groove recessed to correspond to the shape of the rib portion 400, and the outer member 350 is formed on the inner surface 210 of the chamber portion and the rib portion 400 The length of the protrusion of the rib portion 400 may be shorter than the thickness of the outer member 350 surrounding the inner member 340.

As described above, the outer member 350 must support the inner surface of the chamber 200 as much as possible. Therefore, the outer member 350 has rib grooves recessed in a shape corresponding to the rib portion 400 So that the coupling force can be increased by being connected to the inner surface 210 of the chamber portion and the rib portion 400 in contact with each other.

The length of the protrusion of the rib portion 400 from the inner surface 210 of the chamber portion may be shorter than the thickness of the outer member 350 surrounding the inner member 340.

The inner surface 210 of the chamber part is bent from the end of the both side surface areas 212 and the end of the upper and lower surface areas 213 to face the front surface area 211, And the reinforcing part 300 may be caught in the inner space 10. The reinforcing part 300 may be formed of a synthetic resin.

The rear region is formed to be bent at the ends of the both side regions 212 and the upper and lower regions 213 to define the inner space 10. Further, the rear region is connected to the reinforcing portion 300 so as to be in contact with the reinforcing portion 300, thereby capturing the reinforcing portion 300 in the inner space 10. Accordingly, the reinforcing part 300 can be prevented from being separated from the inner space 10 by impact energy from the front side.

(Table 1)

Table 1 is a table comparing the effects of various types of reinforcement parts 300 by the RCAR performance test. The reinforcing part 300 is not disposed in the inner space 10 of the chamber part 200. In this case, In the case of Embodiment 1, the reinforcing portion 300 is formed of a foam having the same expansion ratio without any difference in expansion ratio. In the case of Embodiment 2, the reinforcing portion 300 is formed of the front member 320 and the rear member 330 as described above. In the third embodiment, the reinforcing part 300 is formed of the inner member 340 and the outer member 350 as described above.

In CASE 1-1 to 1-4 of Example 1, the expansion ratio of the foaming resin was increased. In the case of CASE 2-1 to 2-3 of Example 2, foaming resin foam of the back member 330 The expansion ratio of the foamed resin of the front member 320 that functions as the deformable portion is increased while the magnification is fixed at 6 times. In the case of CASE 3-1 to 3-3 of Example 3, the expansion ratio of the foamed resin of the inner member 340 serving as the deformable portion while increasing the expansion ratio of the foamed resin of the outer member 350 serving as the support is increased It is.

Referring to FIGS. 7 and 8, it can be seen that as the expansion ratio of foamed resin increases from CASE 1-1 to CASE 1-4, the weight is decreased while the load and deformation amount are increased. Internal energy decreases. Similarly, from CASE 2-1 to CASE 3-1 to CASE 3-1, the expansion ratio of foamed resin is increased and the weight is decreased while the load and deformation amount are increased. Internal energy decreases. As compared with the first and second embodiments, it can be seen that the third embodiment is the most effective model as the bar reinforcement 300 having the minimum load and the minimum internal energy.

A method for manufacturing a bumper beam for a vehicle according to the present invention includes: a first molding step of molding a reinforcing portion (300) by foaming a foamed resin material; An insert step of disposing the reinforcing part (300) inside the first mold; A main body 100 extending in the longitudinal direction through injection of resin into the first mold, and a body 100 integrally connected to the main body 100 on both sides of the main body 100, And a second shaping step of shaping the chamber part 200 having the inner space 10 surrounding the reinforcing part 300 as a shape corresponding to the protruded shape.

In the first forming step, the reinforcing portion 300 is formed. The reinforcing portion 300 can be filled in the internal space 10 in the vehicle bumper beam in which the internal space 10 is formed. Accordingly, the reinforcing portion 300 is disposed in the inner space 10 of the chamber portion 200, and is capable of absorbing the impact energy while being deformed along with the deformation of the bumper beam for a vehicle when the vehicle collides. In addition, it can play a role of supporting more deformation than a certain degree to prevent further deformation.

Preferably, the reinforcing portion 300 is made of expanded resin material such as Expanded Poly-Propylene (EPP).

When the forming of the reinforcing part 300 is completed through the first forming step, an insert step of placing the reinforcing part 300 in the first mold is performed. Preferably, the reinforcing portions 300 are provided in pairs and may be disposed on both sides of the first mold.

When the insert step is completed, the body portion 100 extending in the longitudinal direction through the second molding step and the body portion 100 are integrally connected to both sides of the body portion 100, The chamber portion 200 having the inner space 10 surrounding the reinforced portion 300 is formed as a shape corresponding to the protruded shape. The main body 100 and the reinforcement 300 can be formed by injecting resin into the first mold.

In the case of resin, at least one of long fiber reinforced composite (G-LFT), polypropylene (PP), polycarbonate (PC), polybutylene terephthalate (PBT), thermoplastic olefin (TPO) And the like. However, the present invention is not limited thereto.

Preferably, in the first molding step, a front member 320 formed of a foam having a predetermined expansion ratio through injection molding of resin into different injection ports formed in the second mold, and a front member 320 formed at the rear end of the front member 320 And the rear member 330 formed of a foam having a lower expansion ratio than that of the front member 320 can be formed.

First, a foaming resin is injected into different injection ports formed in the second mold. Preferably, the partition is provided between the different injection ports of the second mold, and the partition is separated during the molding process, thereby making it possible to manufacture the reinforced portion 300 having different expansion ratio for each portion. The foamed resin material may be made of a material including EPP.

As described above, the front member 320 can function to absorb impact energy when the vehicle collides. And may be formed of a foam having a predetermined expansion ratio so as to be deformed together with the chamber part 200. Here, the predetermined foaming magnification may be 8 to 15 times.

The rear member 330 connected to the rear end of the front member 320 may be formed as a foam having a lower expansion ratio than that of the front member 320 to prevent further deformation. Which is lower than the predetermined foaming magnification of 8 to 15 times.

Preferably, the first forming step includes: a first forming step of forming an inner member (340) formed of a foam having a predetermined expansion ratio through injection of a foaming resin into a third mold; An insert process of disposing the inner member (340) inside the fourth mold; And an outer member (350) which is connected to enclose the inner member (340) through injection of a foaming resin into the fourth mold and is formed of a foam having a lower expansion ratio than the inner member (340) 2 molding process.

First, the inner member 340 is formed using the third mold through a first molding process. In the case of the inner member 340, as described above, the inner member 340 may function to absorb the impact energy when the vehicle collides. And may be formed of a foam having a predetermined expansion ratio. Here, the predetermined foaming magnification may be 8 to 15 times.

When the molding of the inner member 340 is completed, an insert process is carried out in which the inner member 340 is seated in the fourth mold. After the insert process, the outer member 350 surrounding the inner member 340 is formed through a second molding process. The outer member 350 may be formed as a foam having a lower expansion ratio than the inner member 340 so as to prevent the deformation caused by the impact energy as much as possible. Which is lower than the predetermined foaming magnification of 8 to 15 times.

Although the present invention has been shown and described with respect to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It will be obvious to those who have knowledge of.

10: inner space 20: first groove
30: second groove 40: third groove
100: main body part 200: chamber part
210: inner surface of the chamber part 211: front surface area
212: both side regions 213: upper and lower regions
300: reinforced portion 310: outer surface of the reinforced portion
311: first surface area 312: second surface area
313: Third surface area 320: Front member
330: rear member 340: inner member
350: outer member 400: rib portion
410: front rib 411: first axis
412: second shaft 420: both side ribs
430: upper surface rib

Claims (12)

A body portion extending in the longitudinal direction;
A chamber portion formed integrally with the body portion on both sides of the body portion and formed in a forwardly protruding shape and having a shape corresponding to a protruding shape and having an inner space opened rearward;
A reinforcing portion filled in the inner space and connected to the inner surface of the chamber portion forming the inner space so as to be in contact with the reinforcing portion; And
And a rib portion protruding from the inner surface of the chamber portion and contacting the reinforcing portion,
Wherein the inner surface of the chamber portion includes: a front region protruding forward; Both side regions bending back from both ends of the front region; And upper and lower regions bent rearward from upper and lower ends of the front region and connected to both side regions,
The rib portion may include a front rib integrally connected to the front region and having a first axis extending to both sides and a second axis intersecting the first axis and extending vertically; A pair of side ribs extending rearward from the first axis and integrally connected to the both side regions; And a top and bottom ribs extending rearward from the second shaft and integrally connected to the top and bottom regions. delete delete delete The method according to claim 1,
The outer surface of the reinforcing portion
A first surface region provided with a first groove recessed in a shape corresponding to the front rib, which is in contact with the front region, and is in contact with the front region and the front rib;
A second surface region provided with a second groove extending rearward from both ends of the first groove and contacting the both side regions and the side ribs; And
And a third surface region provided with a third groove extending rearwardly from upper and lower ends of the first groove and contacting the upper and lower surface regions and the upper and lower ribs. The method according to claim 1,
The reinforcing portion
A front member formed of a foam having a predetermined expansion ratio; And
And a rear member connected to a rear end of the front member and formed of a foam having a lower expansion ratio than the front member. The method according to claim 1,
The reinforcing portion
An inner member formed of a foam having a predetermined expansion ratio; And
And an outer member connected to surround the inner member and formed of a foam having a lower expansion ratio than the inner member. The method of claim 7,
Wherein the outer member is formed with a rib groove recessed to correspond to the shape of the rib portion, the outer member is connected to the inner surface of the chamber portion and the rib portion,
Wherein a length of the protruding portion of the rib is shorter than a thickness of the outer member surrounding the inner member. The method according to claim 1,
The inner surface of the chamber portion
And a rear region folded from an end of the both side regions and an end of the upper and lower regions and opposed to the front region and connected to the reinforcing portion,
And the reinforcing portion is caught in the internal space. delete delete delete

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