KR20210067424A - Reinforcing member and bumper beam for automobile comprising the same - Google Patents

Abstract

The present invention relates to a reinforcing member and a bumper beam for a vehicle including the same. According to the present invention, a bonding performance between the reinforcing member and the bumper beam in which a metal flake and a reinforcing unit are combined is improved to suppress interfacial delamination between the metal flake and the bumper beam. In addition, it is possible to improve a crash performance by improving flexural rigidity and flexural strength of the bumper beam by using characteristics of a continuous fiber composite material of the reinforcing unit. A reinforcing member of the present invention is characterized in that the continuous reinforcing unit is inserted into a space between the protruding band surface or the press-fitting band surface.

Description

Reinforcing member and bumper beam for automobile including same {REINFORCING MEMBER AND BUMPER BEAM FOR AUTOMOBILE COMPRISING THE SAME}

The present invention relates to a bumper beam for automobiles, and more particularly, to a reinforcing member capable of achieving impact resistance by satisfying low-speed collision law performance, which is a required performance of a bumper beam, and to a bumper beam for automobiles including the same. .

In general, bumper beams for automobiles are mounted on the front and rear of the vehicle to absorb the shock when the vehicle collides, thereby protecting the vehicle and the driver and occupants in the vehicle.

Such bumper beams for automobiles require the satisfaction of the low-speed collision test, which is a legal item, and the Research Council for Automobile Repairs (RCAR) test, which is a compliance item. In this case, the low-speed crash test is generally conducted at a crash speed of 4Km/h, but the tests of non-life insurance companies, which have a great influence on car sales, are conducted at a crash speed of 10~15Km/h, so it has a great influence on car sales. The required performance of non-life insurers with this is higher than the legal requirements. Specifically, in the case of the RCAR test, two tests, 40%, 10 degrees OFF-SET BARRIER TEST and FULL BARRIER TEST, are conducted to calculate the repair cost for vehicle body damage. In relation to the performance of these bumper beams, local regulations require both the low-speed crash test and the non-life insurance company test, or only one of them.

Until now, European specifications have to satisfy both, and domestic specifications only require 40% and 10 degree OFF-SET BARRIER TEST, so they are being developed and applied in two ways.

However, in recent years, as the commercialization trend is being strengthened worldwide, and as it is decided to apply all commercialization tests to domestic specifications, bumper beam technology for automobiles that can respond competitively to all RCAR tests has competitiveness.

In particular, in North America, a rear high-speed crash test is being conducted during fuel leak integrity performance evaluation. This is a regulation that limits the allowable amount of fuel leakage that occurs in a high-speed rear-end collision and is currently applied to all vehicles under 10,000 pounds. However, in the case of a press-formed composite bumper beam, it has a limitation in that it is difficult to distribute the collision energy of the vehicle body due to the breakage of the beam at the beginning of the collision.

Due to these requirements, in the prior art, metal products were insert-molded into plastic bumper beams to overcome the above limitations, but the molding process cost increased, and the bonding between the plastic bumper beam and the metal material did not proceed smoothly. There was a problem in that the performance improvement of the bumper beam could not be smoothly achieved due to interfacial peeling between the metal material and the plastic material.

US Registered Patent Publication No. 5290079 (1994.03.01)

Therefore, the present invention has been devised to solve the above problems, and an object of the present invention is to improve the bonding performance between the reinforcing member and the bumper beam in which the metal flake and the reinforcing part are combined, thereby improving the interfacial peeling phenomenon between the metal flake and the bumper beam. An object of the present invention is to provide a reinforcing member capable of improving collision performance by suppressing and improving the flexural rigidity and flexural strength of the bumper beam by using the characteristics of the continuous fiber composite material of the reinforcing part, and a bumper beam for automobiles including the same.

In order to achieve the above object, the present invention has a plurality of incisions perpendicular to the longitudinal direction of the rectangular metal flake, and a plurality of band surfaces partitioned by the incisions are directed forward with respect to the plane of the metal flake. A protruding band surface is formed, or a press-fitted band surface is formed to be press-fitted backward based on the plane of the metal flake, and a continuous reinforcing part is inserted in the space between the protruding band surface or the press-fitting band surface. A reinforcing member is provided.

In addition, the present invention has a plurality of incisions perpendicular to the longitudinal direction of the rectangular metal flake, and a plurality of band surfaces partitioned by the incisions protruding forward with respect to the plane of the metal flake and a protruding band surface and It provides a reinforcing member in which press-fitting band surfaces press-fitted to the rear are alternately formed, and a continuous reinforcing part is inserted into a space between the protruding band surface and the press-fitted band surface.

According to an embodiment of the present invention, in the reinforcing member, in a state in which the band surface of the metal flake is arranged in at least one or more rows along the longitudinal direction of the beam part, at least one or more of the reinforcement parts are inserted into the opening of the band surface .

In addition, the present invention includes a bumper beam for a vehicle including a reinforcing member.

According to an embodiment of the present invention, the metal flake has an exposed surface in which a part of the reinforcing part is exposed to the outside between the protruding band surface and the protruding band surface or between the press-fitting band surface and the press-fitting band surface.

According to an embodiment of the present invention, in the metal flake, the band surface and the exposed surface are alternately and continuously formed along the longitudinal direction of the beam part.

According to an embodiment of the present invention, the reinforcing part may be a continuous fiber composite material in which one or more reinforcing fibers of carbon fiber, aramid fiber, and glass fiber are reinforced.

According to an embodiment of the present invention, the reinforcing part may be a continuous fiber composite material impregnated with one or more thermoplastic resins of PP, PET, and PA6.

According to an embodiment of the present invention, in the reinforcing member, in a state in which the band surface of the metal flake is arranged in at least one or more rows along the longitudinal direction of the beam part, at least one or more of the reinforcement parts are inserted into the opening of the band surface .

According to the reinforcing member according to the present invention having the configuration as described above and the bumper beam for automobile including the same, the interfacial peeling phenomenon between the metal flake and the bumper beam is improved by improving the bonding performance between the reinforcing member and the bumper beam in which the metal flake and the reinforcing part are combined. There are advantages to being restrained.

According to the present invention, there is an effect that can improve the crash performance by improving the flexural rigidity and flexural strength of the bumper beam by using the characteristics of the continuous fiber composite material of the reinforcing part.

1 is an exploded perspective view showing a beam portion, a stay portion and a reinforcing member of a bumper beam for a vehicle according to the present invention.
2 is a perspective view illustrating a configuration in which a reinforcement member is coupled to a beam portion of a bumper beam for a vehicle according to the present invention.
3 is a perspective view showing a reinforcing member according to a first embodiment of the present invention.
4 is a perspective view showing a reinforcing member according to a second embodiment of the present invention.
5 and 6 are cross-sectional views showing a bumper beam for a vehicle according to the present invention.

Since the present invention may have various changes and may have various forms, embodiments will be described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

The above terms are used only for the purpose of distinguishing one component from another. The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

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

1 is an exploded perspective view showing a beam part, a stay part, and a reinforcing member of a bumper beam for a vehicle according to the present invention, and FIG. 2 is a perspective view showing a configuration in which a reinforcing member is coupled to a beam part of a bumper beam for a vehicle according to the present invention, 3 and 4 are perspective views illustrating a reinforcing member according to the first and second embodiments of the present invention, and FIGS. 5 and 6 are cross-sectional views illustrating a bumper beam for a vehicle according to the present invention.

As shown in FIGS. 1 and 2 , the bumper beam for a vehicle according to the present invention includes a bumper beam 100 having a beam part 110 and a stay part 120 .

Specifically, the beam part 110 is formed to extend long in the horizontal direction, and has a curved profile of an arc shape in which the middle portion is relatively convex forward. On both sides of the longitudinal direction, the front arc-shaped profile is formed more gently than the rear arc-shaped profile, so that the outer portion has a greater thickness in the longitudinal direction. In addition, the bumper beam 100 is formed to have a relatively increased height on both sides in the longitudinal direction.

The beam part 110 has a closed front surface, and includes a rear opening 111 having a cross-sectional portion bent into a 'C' cross-sectional shape with an open rear surface (see FIGS. 5 and 6 ).

The rear opening 111 of the beam part 110 extends from the middle part of the beam part 110 to the part where the stay parts 120 on both sides are formed, and in response to an increase in the height of the bumper beam 100 on both sides in the longitudinal direction, the vertical direction height will also increase.

In order to minimize the production cost, the beam unit 110 uses a thermoplastic resin such as PP, PET, PA6, and a thermoplastic resin-based compound (TPO: Thermoplastic PolyOlefin) and a composite plastic material including a composite material (LFT). applied and molded.

On the other hand, to connect the vehicle body and the bumper beam 100, in order to respond to the low-speed collision law performance, both sides of the longitudinal direction of the beam portion 110 is provided with a stay unit 120 coupled in the front-rear direction of the vehicle body.

As shown in Figure 1, the stay unit 120 according to the embodiment of the present invention has a substantially rectangular cross-sectional structure in front. However, it is not limited to a rectangular cross-sectional shape, and a circular or polygonal cross-sectional structure may be adopted.

Inside the beam part 110 of the bumper beam 100 having such a configuration, the reinforcement member 200 is insert-molded by hot compression molding.

3 and 4, the reinforcing member 200 is a rectangular metal flake in which a plurality of band faces 212 and 213 having a predetermined width along the longitudinal direction of the beam part 110 repeatedly intersect at intervals. (210).

According to the first embodiment of the present invention, a plurality of incision lines 211a perpendicular to the longitudinal direction thereof are formed on the thin metal flake 210, and a plurality of band surfaces ( A protruding band surface 212 that protrudes forward with respect to the plane 211 of the thin metal flake 210 is formed, or a press-fitted band plane that is press-fitted backward relative to the plane 211 of the thin metal flake 210 ( 213 is formed, and the reinforcing part 220 is continuously inserted into the space between the protruding band surface 212 or the press-fitting band surface 213 .

In the first embodiment of the present invention, the protruding band surface 212 and the press-fitting band surface 213 are limited to being formed separately, respectively, but in the configuration in which the protruding band surface 212 and the press-fitting band surface 213 are formed separately. It is not limited, and a structure in which the protruding band surface 212 and the press-fitting band surface 213 are alternately formed with respect to the plane 211 of the metal flake 210 may be adopted.

At this time, the metal flake 210 has a portion of the reinforcement 220 between the protruding band surface 212 and the protruding band surface 212 or between the press-fitting band surface 213 and the press-fitting band surface 213 . An exposed surface 214 exposed to the outside is formed. That is, the band surfaces 212 and 213 and the exposed surface 214 are continuously formed alternately along the longitudinal direction of the beam unit 110 .

According to the first embodiment of the present invention, the reinforcing member 200 is inserted through the open openings of the band faces 212 and 213 of the metal foil 210 and a single reinforcing part partially exposed through the exposed face 214 . (220).

Here, the reinforcing part 220 is a strap formed long in the longitudinal direction, and one or more reinforcing fibers of carbon fiber, aramid fiber, and glass fiber are reinforced, while at least one thermoplastic resin of PP, PET and PA6 is used. As an impregnated continuous fiber composite material, it may be limitedly applied only to the beam part 110 excluding the stay part 120 .

The reinforcing part 220 is inserted parallel to the metal flake 210 through the openings of the band surfaces 212 and 213 of the metal flake 210 and is partially wrapped by the band faces 212 and 213, the reinforcement member 200 will complete

The reinforcing member 200 is manufactured through a hot compression molding process so as to be inserted into the beam part 110 , thereby effectively absorbing impact energy such as in a vehicle collision, thereby minimizing damage to the vehicle body.

Continuous fiber composite materials are most suitable to be used as reinforcement for automobile bumper beams in terms of body rigidity and weight reduction, and mechanical strength, rigidity and impact performance are improved by varying the mixing ratio of reinforcing fibers mixed with continuous fiber composite materials. It is possible not only to make it possible, but also to secure excellent low-temperature characteristics in which the physical properties do not deteriorate even at low temperatures.

4 is a perspective view showing a reinforcing member 200 according to a second embodiment of the present invention. Hereinafter, in describing a second embodiment of the reinforcing member 200 according to the present invention, the same as the first embodiment of the present invention. Configurations having the same function as the configuration are designated by the same reference numerals, and detailed descriptions of these configurations will be omitted to avoid repetitive configurations.

As shown in FIG. 4 , the reinforcing member 200 according to the second embodiment of the present invention may have a configuration in which the reinforcing part 220 is inserted into the band surfaces 212 and 213 of the metal foil 210 in two rows. have.

Specifically, the reinforcing member 200 has two reinforcing parts 220 in a state in which the band faces 212 and 213 of the metal foil 210 are arranged in two rows along the longitudinal direction of the beam part 110, and the band faces 212 are formed. is inserted into the opening of the

In the embodiment according to the present invention, the metal flakes 210 may be variously modified without being limited to a configuration arranged in one or two rows, and may be arranged in various rows if the same effect and performance can be exhibited.

Referring to FIGS. 2, 5 and 6 , the reinforcing member 200 configured as described above is insert-molded in the beam part 110 of the bumper beam 100 formed of a composite plastic material.

In the insert molding process between the beam part 110 and the reinforcing member 200 through the hot compression molding process, the reinforcing member 200 molding is formed in a state in which the molding of the beam part 110 of the bumper beam 100 has undergone the primary compression molding process. It is a process of performing secondary compression molding after putting the beam part 110 into the molded product so that the reinforcement member 200 molded product is joined by compression molding in the longitudinal direction of the beam part 110 of the bumper beam 100 .

In order to apply the reinforcing member 200 to the beam part 110 through compression molding as described above, the bumper beam 100 should sufficiently absorb the impact energy in the event of a car collision, so that the bumper beam 100 should not be damaged. In order not to cause destruction of the bumper beam 100, it is necessary to increase the elongation or fracture strength of the material in consideration of dimensional stability and the characteristics of a low-temperature environment. The reality is that it is difficult to increase the absorption rate for impact energy as a material due to a decrease in elongation.

Accordingly, the bumper beam for automobiles according to the present invention is compression-molded by inserting the reinforcing member 200 in which the metal flake 210 and the reinforcing part 220 are combined into the beam part 110 through a hot compression molding process. The bonding performance between the continuous fiber composite material of the reinforcement part 220 exposed through the exposed surface 214 of the member 200 and the composite plastic material of the beam part 110 is improved, so that the metal foil 210 and the composite plastic material are used. It is possible to suppress the interfacial peeling phenomenon between the bumper beams 100 made.

In addition, by improving the flexural rigidity and flexural strength of the bumper beam 100 through the impact resistance of the continuous fiber composite material of the reinforcing part 220, it is possible to satisfy the performance of low-speed collision laws.

Referring to the cross-sectional views of the bumper beams of FIGS. 5 and 6 , the reinforcing member 200 is insert-molded in the beam part 110 . Referring to the drawings, among the parts to be compression molded with the beam part 110, reinforcement While the metal flakes 10 of the member 200 are made of different materials, the bonding performance is deteriorated, while the reinforcement part 220 exposed to the front through the exposed surface 214 of the reinforcement member 200 is made of a composite plastic material. It is made of the same material as the beam portion 110, and when compressed through hot compression molding, there is no large deviation between the materials while bonding to each other, so that fusion bonding is possible. That is, since the material of the reinforcement part 220 and the beam part 110 of the reinforcement member 200 is formed of the same material as each other, bonding performance is improved. Therefore, it is possible to prevent the interfacial peeling phenomenon between the beam portion 110 of the bumper beam 100 and the reinforcing member 200 . In addition, damage to the bumper beam 100 can be suppressed through the reinforcement of the beam part 110 by the reinforcement part 220 made of the continuous fiber composite material.

Therefore, in the present invention, even if the reinforcement member 200 is damaged by the impact energy transmitted to the bumper beam 100 in the case of a car collision accident and is separated from the beam part 110 of the bumper beam 100, the reinforcement part 220 and By improving the bonding performance between the beam portions 110 of the bumper beam 100, it is possible to prevent the interfacial peeling phenomenon between the reinforcing member 200 and the bumper beam 100, as well as the reinforcing member 200 made of a continuous fiber composite material. As the damage of the bumper beam 100 is suppressed through the reinforcement of the beam part 110 by the reinforcement part 220 of the collision performance can be improved.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

100: bumper beam 110: beam part
120: stay 200: reinforcing member
210: metal foil 211: flat
212: protruding band surface 213: press-fitting band surface
220: reinforcement

Claims (9)

Having a plurality of incisions perpendicular to the longitudinal direction of the rectangular metal flake, a protruding band surface is formed in which a plurality of band surfaces partitioned by the incisions protrude forward with respect to the plane of the metal flake, or the metal flake A press-fitting band surface is formed that is press-fitted backwards based on the plane of
Reinforcing member, characterized in that the continuous reinforcement is inserted into the space between the protruding band surface or the press-fitting band surface.
It has a plurality of incisions perpendicular to the longitudinal direction of the rectangular metal flake, and a plurality of band surfaces partitioned by the incisions is a protruding band surface protruding forward with respect to the plane of the metal flake and a press-fitting band press-fitted backward The faces are formed alternately,
Reinforcing member, characterized in that the continuous reinforcement is inserted into the space between the protruding band surface and the press-fitting band surface.
3. The method of claim 1 or 2,
The reinforcing member is a reinforcing member, characterized in that the at least one or more reinforcing parts are inserted into the opening of the band face in a state in which the band face of the metal flake is arranged in at least one row along the longitudinal direction of the beam part.
A bumper beam for a vehicle comprising the reinforcing member according to claim 1 and 2.
5. The method of claim 4,
The metal flake is a bumper beam for automobiles, characterized in that the exposed surface is formed between the protruding band surface and the protruding band surface or between the press-fitting band surface and the press-fitting band surface, a part of the reinforcing part is exposed to the outside.
6. The method of claim 5,
The metal flake is a bumper beam for automobiles, characterized in that the band surface and the exposed surface are alternately and continuously formed along the longitudinal direction of the beam part.
6. The method of claim 5,
The reinforcing part is a bumper beam for automobiles, characterized in that it is a continuous fiber composite material in which one or more reinforcing fibers of carbon fiber, aramid fiber and glass fiber are reinforced.
6. The method of claim 5,
The reinforcing part is a bumper beam for automobiles, characterized in that it is a continuous fiber composite material impregnated with one or more thermoplastic resins of PP, PET, and PA6.
5. The method of claim 4,
The reinforcing member is a bumper beam for automobiles, characterized in that at least one or more of the reinforcing parts are inserted into the opening of the band face in a state in which the band surface of the metal flake is arranged in at least one row along the longitudinal direction of the beam part. .

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