KR20170070981A

KR20170070981A - Car crash box

Info

Publication number: KR20170070981A
Application number: KR1020150178756A
Authority: KR
Inventors: 문화식
Original assignee: 에스엠티(주)
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2017-06-23

Abstract

The present invention can be applied to a spiral tube produced by a hydroforming process to simplify the assembling process by eliminating welding points and to stably induce the directionality of collapse caused by collision energy, The present invention provides a crash box for a vehicle that induces collapse to absorb and disperse impact energy efficiently to improve impact absorption performance.

Description

Car crash box {

The present invention relates to a crash box for a vehicle, and more particularly, to a crash box for a vehicle which can simplify an assembling process by applying a spiral tube manufactured by hydroforming and stably induce a directionality thereof upon collision by collision energy .

Generally, a bumper in a vehicle is designed to absorb a shock of a vehicle when the vehicle collides with another automobile or a fixed body, to secure the rider's safety, and at the same time, Is a buffer unit to be disposed.

1, the bumper 100 has stays 103 mounted on the rear sides of the bumper beam 101 arranged in the vehicle width direction from the front and rear of the vehicle, A bumper beam unit 105 fixed to the side member 113 and an energy absorber 107 disposed in front of the bumper beam 101 for absorbing the impact force and the bumper beam 101 and the energy absorber 107 And a bumper cover 109 surrounding the bumper cover 109.

2, the conventional crash box 111 is assembled through forward flanges 115 to the respective stays 103 welded and fixed to both sides of the rear side of the bumper beam 101. As shown in Fig.

3, the conventional crash box 111 is provided with front and rear flanges 115 and 117 at the front and the rear, The inner panel 119 to be molded and the outer panel 121 are overlapped and welded to form a box shape.

However, the conventional crash box 111 as described above is in the development process for the safety and light weight of the bumper in recent years, it is preferable in terms of absorbing the impact energy so as to minimize the damage of the vehicle body structure while absorbing the shock However, when the collision is caused by the impact force, the directionality is irregular, so that the collision energy can not be efficiently absorbed and dispersed. Therefore, there is still a concern that the vehicle may be damaged. In addition, It is necessary to apply CO2 welding or multipoint spot welding to a welding system using a robot in a state where it is fixed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a spiral tube which is formed by hydroforming a box part, When colliding with collision energy, the directionality is steadily guided, and at the same time,

Which is capable of absorbing and dispersing collision energy efficiently by inducing collapse of the collision-induced collision, thereby improving impact absorption performance

In order to achieve the above object, the present invention provides a crash box for a vehicle in which a front and rear flanges are provided at front and rear sides of a vehicle, and a box portion for absorbing an impact force is provided between the front and rear flanges And the box portion is formed by a spiral tube which is formed by expanding the diameter of the box portion from the front side connected to the front flange to the rear side where the rear flange is connected and gradually forming a bead having a spiral groove along the outer peripheral surface .

The helical tube is formed by hydroforming molding.

Wherein the connecting portion of the front flange and the helical tube forms a bent end by bending the front end of the helical tube inward, and the front flange forms a circular hole passing through the center, As shown in Fig.

And the front flange is formed by orbital molding the edge portion of the circular hole with respect to the bent end of the helical tube.

And a connecting portion between the rear flange and the helical tube is characterized in that a rear end of the helical tube is welded to the rear flange and fixed.

As described above, according to the crash box for a vehicle according to the present invention, the box portion is applied as a helical tube manufactured by hydroforming to eliminate welding points, thereby simplifying the assembling process. As a result, There is an advantage that the welding system used is unnecessary. In addition, when collapsing due to collision energy, the directionality is stably guided, and sequential collapse from the front to the rear is induced, thereby effectively absorbing and dispersing collision energy, thereby improving impact absorption performance.

1 is an exploded perspective view of a general automotive bumper.
2 is a perspective view of a vehicle bumper beam unit to which a crash box for a vehicle according to the related art is applied.
3 is an exploded perspective view of a crash box for a vehicle according to the prior art.
4 is a perspective view of a perp beam unit to which a crash box according to an embodiment of the present invention is applied.
5 is a perspective view of a crash box according to an embodiment of the present invention.
6 is an exploded perspective view of a crash box according to an embodiment of the present invention.
7 is a cross-sectional view of a crash box according to an embodiment of the present invention.
8 is a hydroforming process diagram for manufacturing a helical tube of a crash box according to an embodiment of the present invention
9 is a cross-sectional view of a collapse state of a crash box according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 4 is a perspective view of a perp beam unit to which a crash box according to an embodiment of the present invention is applied, and FIGS. 5 and 6 are assembled and disassembled perspective views of a crash box according to an embodiment of the present invention.

The crash box 1 for a vehicle according to the present embodiment is applied instead of an existing stay for connecting the vehicle body and the bumper beam 3, as shown in Fig.

5 and 6, the crash box 1 includes a front flange 11 for mounting to the bumper beam 3 and a rear flange 11 for mounting to a front side member (not shown) And a spiral tube 20 is formed between the front and rear flanges 11 and 13 to form a box portion. Here, the front and rear flanges 11 and 13 are each formed of a rectangular plate having a circular hole H penetrating through the center thereof.

The helical tube 20 is formed by expanding the tube 31 by hydraulic pressure in the hydroforming mold 30 as shown in FIG. The bead B is formed so that its diameter becomes gradually larger toward the rear side where the flange 13 is connected and the helical groove is formed along the outer circumferential surface. 7, the connecting portion between the front flange 11 and the helical tube 20 is formed by bending the front end of the helical tube 20 inwardly to form a bent end 21, The flange 11 is connected so that the edge of the circular hole H formed at the center thereof is bent outwardly so as to surround the bent end 21 and is not fixed completely in the rotating direction.

That is, the front flange 11 may be connected to the edge of the circular hole H by orbital forming with respect to the bent end 21 of the helical tube 20.

The rear end of the spiral tube 20 is welded to the rear flange 13 by fixing the connection between the rear flange 13 and the spiral tube 20.

Therefore, as shown in Fig. 4, the crash box 1 for a vehicle having the above-described configuration is fastened to the front bumper beam 3 via the front flange 11 instead of the stay, and the rear flange 13 Is fastened to the front side member (not shown) to connect the vehicle body and the bumper beam 3. [

In this state, when the impact energy is inputted through the bumper due to collision and collision of the vehicle, the shock energy is transmitted to the vehicle body through the front side member while absorbing the impact energy. Since the helical tube 20 constituting the box part is connected to the front and rear flanges 11 and 13 in a state of being manufactured by the hydroforming, The CO2 welding machine can be used to weld the rear flange 13 and the helical tube 20 without welding to each other, thereby improving assembling performance. 9, the helical tube 20 collapses while absorbing the collision energy by the helical bead B, at which time the collapse is caused by the helical bead B, And a stable bobbin

At the same time, sequential collapse from front to back is induced, so that efficient collision energy absorption and dispersion operation is achieved.

Is an exploded perspective view of an ordinary vehicle bumper

Claims

Claim 1
A crash box for a vehicle, comprising front and rear flanges on the front and rear sides, and a box portion for absorbing an impact force between the front and rear flanges,
Wherein the box portion is formed by a spiral tube that is formed by expanding the diameter of the box portion from a front side connected to the front flange to a rear side where a rear flange is connected to the front portion and gradually forming a bead having a helical groove along an outer peripheral surface thereof, Wherein the tube is orbital-molded to the bent end of the crush box-type tube.