KR101513550B1

KR101513550B1 - Composite crash box satisfied vehicle impact characteristics

Info

Publication number: KR101513550B1
Application number: KR1020140026840A
Authority: KR
Inventors: 임종명; 최원준
Original assignee: 한화첨단소재 주식회사
Priority date: 2014-03-07
Filing date: 2014-03-07
Publication date: 2015-04-20

Abstract

The present invention relates to a composite crash box satisfying collision performance, comprising: a composite crush box including a connecting piece fixed to a bumper beam and a holding plate fixed to the car body, wherein the connecting piece has a pair of single plates spaced apart And a plurality of ribs are connected and fixed between the connecting pieces to reinforce the strength of the connecting pieces. In the event of a collision, the single plate-shaped connecting piece is bent and deformed to primarily absorb the impact energy, The composite crash box satisfies the collision performance, which is designed so that secondary absorption is performed in the periphery.
Industrial Applicability According to the present invention, it is possible to easily produce a crash box having different shapes and characteristics for each type of vehicle because it is easy to manufacture due to one-press molding, improved strength and collision absorbing power, and free from local strength reinforcement.

Description

[0001] COMPOSITE CRASH BOX SATISFIED VEHICLE IMPACT CHARACTERISTICS [0002]

The present invention relates to a composite crash box satisfying crashworthiness, and more particularly, to a collision performance that can contribute to improvement of a vehicle performance by intensively reinforcing a portion where a local stiffness is required in a crash, To a satisfactory composite crash box.

In general, a bumper system for a vehicle is designed to elastically deform at a low-speed collision of a vehicle, thereby physically damaging the vehicle. In this case, the bumper system absorbs the impact of collision with another vehicle or a fixed body, , And a shock absorber disposed at the front and rear of the vehicle so as to minimize deformation of the vehicle body at the same time.

1, the bumper system includes a bumper beam 3 basically mounted in the vehicle width direction from the front and rear of the vehicle and including two bumper rails 3a and 3b, An energy absorber 2 disposed in front of the bumper beam 3 and absorbing an impact force and a bumper cover 1 for enclosing the bumper beam 3 and the energy absorber 2, and a crash box 4 for interconnecting the side members 5.

Thus, the collision energy is absorbed as much as possible in the event of a vehicle collision, thereby minimizing the deformation of the vehicle body, thereby securing the occupant safety.

Therefore, the regulations on bumper systems are very strict, especially in the European market, the requirements are very demanding and more stringent.

For example, in RCAR or Full Barrier Test, it is possible to absorb the maximum impact energy by compression, deformation or fracture within the limit that the bumper beam can withstand in the event of a collision to reduce the damage of the car body, To avoid damage, the bumper beam must be minimized in strain and must not be broken easily.

In order to satisfy such a performance, the members constituting the bumper system should be optimally designed. However, the structure of the crash box 4 directly related to the impact energy absorption is very important.

Moreover, this is more so because it is necessary to satisfy the lightweighting issue of the vehicle.

Initially, the crash boxes have been formed by bending a plate material such as a 'C' shape, a 'W' shape, and the like and forming a part of the steel material as shown in Published Unexamined Utility Model Nos. 1998-036681 and 0240026 There have been efforts to increase collision absorption capacity.

However, as a basic property that a crash box should have, it is deformed at the time of collision but is not easily broken so that the collision energy is not transmitted to the bumper beam as much as possible. In some cases, however, There is a problem that collision energy is directly transmitted to the bumper beam, and on the contrary, there is a problem that it is easily broken.

Particularly, since the conventional steel crash box is constructed by assembling at least three to four pieces (P1, P2, P3) as shown in the example of FIG. 2, not only the structural safety but also the shock absorbing capability is lowered, , It is difficult to reinforce the local stiffness more than anything else.

The present invention has been made in view of the above-described difficult and difficult conditions and phenomena, and is intended to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing an impact- The present invention has been made in view of the above problems, and it is an object of the present invention to provide a composite crash box which satisfies the collision performance.

The present invention provides a composite crash box including a connecting piece fixed to a bumper beam and a fixing plate fixed to the vehicle body, wherein the connecting piece has a pair of single plates arranged in parallel A plurality of ribs are connected and fixed between the connecting pieces to reinforce the strength of the connecting pieces. In the event of collision, the single plate-like connecting piece is bent and deformed to primarily absorb the impact energy, And the second collision is performed.

At this time, the fixing plate, the connecting piece, and the rib are also manufactured by one-piece molding.

Further, one side of the connecting piece is formed as an opening portion, and the other side is also formed by an one-press molding so as to form a closed portion.

In addition, the opening portions of the connecting pieces are also arranged so as to face each other.

In addition, the ribs are integrally formed with different numbers, different heights, and different widths.

Industrial Applicability According to the present invention, it is possible to easily produce a crash box having different shapes and characteristics for each type of vehicle because it is easy to manufacture due to one-press molding, improved strength and collision absorbing power, and free from local strength reinforcement.

1 is an exemplary view showing a bumper system of a conventional vehicle.
FIG. 2 is an exemplary view of a conventional bumper system in which a crash box is detached. FIG.
3 is an illustration of an example of a crash box according to the present invention.
4 is an exemplary view showing an example of installation of a crash box according to the present invention.
5 is an exemplary view showing an example of collision test of a crash box according to the present invention.

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

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

As shown in FIGS. 3 and 4, the composite crash box satisfying the collision performance according to the present invention is manufactured by one-press molding.

That is, the crash box 100 according to the present invention is largely composed of a fixing plate 110, a connecting piece 120, and a rib 130, which are integrally formed through a single press molding.

Therefore, the ribs 130 formed in the pair of connecting pieces 120 may have different heights, different spacings, different numbers, and different widths according to design specifications.

3 (a), the left side is closed when viewed from the side of FIG. 3 (b), and the other side of the opposite side Is kept open.

In other words, it can be considered that the open portion is the portion where the mold is pressed and pressed, and the opposite surface is the pressed portion (see the crash bumper mounted on the right side of FIG. 4).

4, the connecting piece 120 is fixed to the bumper beam 200, and the connecting plate 120 is fixed to the bumper beam 200. As shown in FIG. 4, the connecting plate 120 is fixed to the fixing plate 110, The fixing plate 110 is fixed to the side member of the fixing plate 110. [

As described above, in the crash box 100 according to the present invention, since the connecting piece 120 fixed to the bumper beam 200 is fixed on a single plate, unlike the conventional case in which a substantially ' It is easily deformed in the longitudinal direction of the connecting piece 120 and the collision energy can be absorbed easily and quickly by the deformation.

Particularly, in the present invention, a plurality of ribs 130 are connected and fixed between a pair of connecting pieces 120. However, the ribs 130 do not have a uniform shape, It is possible to minimize the collision energy in accordance with the design specifications of the vehicle. In other words, it is possible to reduce the breaking force transmitted to the vehicle body while increasing the impact energy absorbing power. Structure.

In addition, the openings of the connecting pieces 120 can be easily deformed, and the sealing portions on the opposite sides of the connecting pieces 120 can be artificially asymmetrically formed so as to cause different distortions so as to prevent the distortion, Since the center of the length is not broken and the open portions of the connecting piece 120 are provided so as to be opposed to each other, an arc-shaped collisional deformation is generated inside and the elasticity is buffered.

In other words, the open portion, which is an easy side to be collapsed, is arranged to be opposed to each other from the inside, thereby constituting an effective collision buffering function in the full barrier test.

This, on the other hand, allows the offset barrier test to be satisfactorily tolerated with sufficient rigidity at the relatively less squashed closure, and to provide effective collision stability during RCAR testing.

Fig. 5 is a photograph of a test of how the structure of the present invention exhibits a deformation behavior at the time of collision.

5, the inside of the connecting piece 120 of the crash box 100, that is, the opening portion of the crash box 100, which is deformed more easily than the bumper beam 200, And it is confirmed that it provides stable collision absorbing force.

Particularly, the single-piece connecting piece 120 directly connected to the bumper beam 200 is bent and deformed as shown in the figure to perform the first collision buffering function. At the same time, the opening part of the connecting piece 120 collapses It is confirmed that the secondary collision buffering function is completely performed and the inherent buffering function of the crash box 100 is achieved.

As described above, the crash box according to the present invention can sufficiently attain desired collision buffering function through a simple structure change, and it can be confirmed that the conventional problem can be solved even without complicated design change or new product development.

100: Crash box 110: Fixing plate
120: connecting piece 130: rib
200: Bumper beam

Claims

A composite crash box comprising a connecting piece fixed to a bumper beam and a fixing plate fixed to the vehicle body,
Wherein the connecting piece is arranged such that a pair of single plates are arranged in parallel with an interval,
And a plurality of ribs are connected and fixed between the connecting pieces to reinforce the strength,
Wherein the impact absorbing member is designed to primarily absorb impact energy when the single plate-shaped connecting member is bent and deformed at the time of impact, and to perform secondary absorption around the ribs connecting and fixing the connecting pieces.

The method of claim 1,
Wherein the fixing plate, the connecting piece, and the ribs are manufactured by one-piece molding.

The method of claim 2,
Wherein one side of the connecting piece is formed as an opening portion and the other side is formed by an one-piece molding so as to form a closed portion.

The method of claim 3,
And the openings of the connection pieces are disposed opposite to each other.

The method of claim 1,
Wherein the ribs are integrally formed with different numbers, different heights, and different widths.