KR20210020224A - chalyang jeonbu gujo - Google Patents

Abstract

The present invention relates to a front structure of a vehicle having a bumper reinforcement disposed in the vehicle width direction at the front part of a pair of front side members. An extension part is disposed outside the front side member of the bumper reinforcement in the vehicle width direction. The extension part includes: a front protrusion portion which protrudes forward from the bumper reinforcement at the front side of the pair of front side members outside the respective arrangement and installation positions; and a rear protrusion portion projecting backward from the back side. When a small overlap collision occurs, the load applied to the extension part is transmitted to the front side member by the rear protrusion portion through the front protrusion portion and absorbed.

Description

Overall structure of vehicle{chalyang jeonbu gujo}

The present invention relates to a vehicle front structure having an extension part outside the vehicle width direction of a bumper reinforcement extended in the vehicle width direction supported by a pair of front side members extending in the vehicle front-rear direction, and in particular It relates to the overall structure of the vehicle that transmits the load in the event of a small overlap collision to the front side members through this extension.

In a conventional vehicle overall structure, in a bumper reinforcement that is supported by a pair of front side members extending in the front and rear direction of the vehicle and extending in the vehicle width direction, generally, a pair of extension units are installed outside the vehicle width direction. Has been. This pair of extension portions is further extended to the left and right outward sides from a portion where the left and right front side members abut against the bumper reinforcement and is provided. In addition, when a load is applied by offsetting to the left or right portion in front of the vehicle and colliding with another vehicle, referred to as a small lap collision, the load is transmitted to the front side member through the extension unit. Small wrap collisions are a form of offset frontal collision.

For example, in Patent Document 1, the extension portion of the bumper reinforcement and the outer surface of the front side member are connected by a connecting member. In this structure, the extension part of the bumper reinforcement is supported by the connecting member at the time of the micro-lap collision, and the connecting member connected to the front side member is deformed together with the crash box, thereby preventing deformation of the bumper reinforcement.

In Patent Document 2, the load transmission member is fixed to the extension portion of the bumper reinforcement, and the load transmission member is disposed at a position where the front side member and the vehicle width direction overlap. In this structure, at the time of a small lap collision, one side of the crash box is compressed and deformed, and the load transmission member abuts the outside of the front side member, and thereby, the component force of the collision load to the inside in the vehicle width direction. Is transmitted from the bumper reinforcement to one of the front side members through the load transmission member.

Conventionally, in the front structure, the load at the time of a small lap collision is transmitted from the extension part to the front side member. However, in any technique, if the position of the collision body in contact with the vehicle during a small lap collision is changed in the vehicle width direction, the load sharing of all parts of the vehicle such as bumper reinforcement or one front side member, abutting position, and deformation timing There are cases where the back changes, and the stability could not be reduced by that much.

Accordingly, an object of the present invention is to provide an entire vehicle structure that more stably absorbs a load even if the relative position of the collision body and the vehicle body changes in the vehicle width direction during a small lap collision.

In order to achieve the above object, the present invention is a bumper reinforcement is supported in the vehicle width direction in the front part of the front side members arranged and installed in the propulsion direction on both sides of the vehicle width direction, and the front of the bumper reinforcement In the entire vehicle structure in which an extension part is installed outside the vehicle width direction than the side member, and a load applied outside the vehicle width direction than the front side member is transmitted to the front side member through the extension part, the extension part comprises: A front protrusion protruding forward from the bumper reinforcement outside of the support position of the front side member is provided on the front side, and on the rear side of the extension part, the front side member at the time of a small wrap collision Abutting rear protrusions are provided.

Here, at the front portion of the front side member, a pair of weakened portions for reducing the rigidity near the front end portion of the front side member are connected to each other and fixed to the left and right side rear surfaces of the bumper reinforcement, respectively. have. The weak body portion is preferably made of a crash box, and in the case of a frontal impact, the crash box can be compressed and deformed in the axial direction, and in the case of a small lap impact, the extension portion can be bent and deformed by abutting the rear protrusion. .

The extension part may be formed integrally with the bumper reinforcement. In that case, it forms part of the bumper reinforcement. The extension portion is gently curved toward the rear side of the vehicle body as it faces outward in the vehicle body width direction, and the length dimension along the curve direction is set to be shorter than the length dimension along the front and rear direction of the vehicle body

It is desirable to have.

The front protrusion preferably has a front end protruding toward the front of the vehicle from the front side of the extension unit, a vertical wall outside the vehicle width direction and a vertical wall inside the vehicle width direction, and a vertical wall outside the vehicle width direction Is formed longer in the vehicle front-rear direction than the vertical wall inside the vehicle width direction.

The front protrusion, preferably, the front end portion of the vehicle body with respect to the frontmost edge of the bumper reinforcement so that the front end portion is located at a rear side than the frontmost edge of the bumper reinforcement disposed between the front side members. Although it is arranged with a predetermined gap in the rear direction, it is more preferable that it protrudes forward rather than the front edge of the bumper reinforcement outside the support position of the front side member.

It is preferable that the rear protrusion protrudes from the rear side of the extension portion toward an intermediate position in the front-rear direction of the vehicle, and is disposed in a non-bonding state with the weak body portion.

According to the present invention, at the time of a frontal collision, the front protrusion and the extension are deformed toward the rear of the vehicle, and accordingly, the rear protrusion is displaced toward the front of the vehicle. On the other hand, in the case of a small lap collision, the front protrusion abuts at the initial contact position with the collision body, and the extension part is pressed toward the rear of the vehicle, whereby the rear protrusion abuts the weak body part, thereby bending the weak body part.

In the present invention, the front protrusion is provided in the extension part to protrude forward from the bumper reinforcement outside the support position of the front side member. Therefore, when a load is applied to the extension part from the front collision body during a small lap collision, even if the relative position of the collision body and the vehicle body in the vehicle width direction is different, the front protrusion first abuts the collision body. Therefore, the input position of the load from the front collision body to the extension part is stabilized at the time of the micro-lap collision.

In addition, the extension portion is provided with a rear protrusion that abuts against the front side member in case of a small wrap collision. For this reason, after the impact body abuts against the front protrusion of the extension part during a micro-lap collision, the load applied to the extension part is transmitted to the front side member through the rear protrusion and is absorbed. Specifically, on the front end side of the front side member

When a weak body such as a crash box is installed, when the vehicle in front of the collision body collides with the extension part of the bumper reinforcement due to a small lap collision, the front protrusion protruding to the front of the bumper reinforcement first contacts the collision body. . In response to this load, the rear protrusion provided on the rear side of the extension abuts the crash box from the outside, thereby bending the crash box. As a result, partial pressure in the vehicle width direction is generated and the load is absorbed. As a result, even if the relative positions of the collision body and the vehicle body in the vehicle width direction at the time of the micro-lap collision are different, the entire vehicle structure capable of stably absorbing the load can be provided.

To the front portion of the front side member, a pair of weakened portions for reducing the rigidity in the vicinity of the front end portion of the front side member are connected to each other and are fixed to the left and right side rear surfaces of the bumper reinforcement. The weak body portion is preferably made of a crash box, and in the case of a frontal impact, the crash box can be compressed and deformed in the axial direction, and in the case of a small lap impact, the extension portion can be bent and deformed by abutting the rear protrusion. .

[0016] The above contents and other characteristics, features, and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings (the same and corresponding parts in the drawings are indicated by the same reference numerals).
1 is a perspective view schematically showing a structure of an entire vehicle according to an embodiment of the present invention.
Fig. 2 is a plan view showing one side in the vehicle width direction of the entire vehicle structure according to the embodiment of the present invention.
3A and 3B are schematic diagrams for explaining a deformed state at the time of a frontal collision of the entire vehicle structure according to the embodiment of the present invention.
4A to 4C are schematic diagrams for explaining the deformation state of the entire vehicle structure according to the embodiment of the present invention at the time of a small lap collision.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following detailed description is merely exemplary and is not intended to limit the invention and use. In addition, it is not limited to be limited to the preceding background or any theory presented in the detailed description below. In the drawing, F denotes the vehicle front, R denotes the rear of the vehicle, and W denotes the vehicle width direction.

In the overall vehicle structure according to the embodiment of the present invention, as shown in Figs. 1 and 2, a pair of front side members 11 extend in the vehicle front-rear direction (F, R) on both sides of the vehicle width direction (W). It is arranged and installed, and the bumper reinforcement 13 is supported in the vehicle width direction in the front part of each front side member 11.

A pair of weak body parts 15 are connected to each other in the front part of each front side member 11, and the bumper reinforcement 13 is fixed to the front end of the weak body part 15. The weak body 15 is fixed to the left and right side rear surfaces of the bumper reinforcement, respectively, by means of bolt fastening or the like. This weak body 15 reduces the rigidity of the front portion of the front side member 11.

It is formed integrally with the body by lowering it. The weak body portion 15 may be configured by bonding a crash box formed separately from the front side member body having high rigidity. The weakening portion 15 is provided between at least the front side of the transmission 17 of the drive system to the bumper reinforcement 13.

An extension part 19 is provided outside the front side member 11 in the vehicle width direction W in a shape in which the bumper reinforcement 13 is extended. The extension part 19 is formed separately from the main body of the bumper reinforcement 13 and can be joined at both ends, but in this case, it is formed integrally with the bumper reinforcement 13 to form a bumper reinforcement 13 ). The extension portions 19 are provided in pairs on both end sides in the vehicle width direction W, and are supported by the front side members 11 so that the front ends become free ends. The left and right extension portions 19 are gently curved toward the rear of the vehicle body as they face outward in the vehicle body width direction, and the length dimension of the curved extension portion in the longitudinal direction is the length along the front and rear direction of the vehicle body It is set shorter than the dimension.

1 and 2, a front protrusion 21 is provided on the front side of each of the extension portions 19 in the vehicle front-rear directions F and R. Each of the front protrusions 21 is formed integrally with the extensions 19. Each of the front protrusions 21 may be formed separately and bonded to the extension 19. The front protrusion has a front end portion 21e protruding toward the front of the vehicle from the front side of the extension portion 19, a vertical wall 21a outside the vehicle width direction, and a vertical wall 2lb inside the vehicle width direction. . The vertical wall 21a outside the vehicle width direction is formed longer in the front and rear direction of the vehicle than the vertical wall 2lb inside the vehicle width direction.

The front distal end 21e of the front protrusion 21 protrudes forward from the bumper reinforcement 13 outside the support position of the front side member 11. Specifically, the position P3 of the most protruding front tip portion 21e of the front protrusion 21 preferably protrudes forward from the positions P1 and P2 of the front edge of the bumper reinforcement 13 have.

By appropriately setting the amount of protrusion of the front protrusion 21, it is possible to stabilize the position where the load from the colliding body X (FIG. 2) is input at the time of the micro-lap collision.

On the other hand, the position P3 of the front tip portion 21e of the front protrusion 21 is disposed to be a rear side in the vehicle front-rear direction than the position P4 of the frontmost edge of the bumper reinforcement 13. That is, as shown in Figs. 2 and 3(a), the initial contact position at the time of the small lap collision of the front distal end 21e and the initial collision position at the time of the frontal collision of the bumper reinforcement 13 are in the front and rear directions. As a result, a gap indicated as space S is secured. Therefore, at the time of a frontal impact, a space S is secured between the front end portion 21e and the impact body X'in front of the front end portion 21e. Since this space S is a space in which deformation occurs, it is referred to as a deformation space S.

2 is a plan view showing the left side in the vehicle width direction. As is well shown in this figure, the front protrusion 21, a part or the whole of the front end portion 21e of the vehicle width direction (W) than the central position (P0) of the rear protrusion 23 It is placed on the outside. As described above, the front protrusion 21 has a vertical wall 21a outside the vehicle width direction within the vehicle width direction.

It is formed longer in the vehicle front-rear direction than the side vertical wall (2lb). In this way, the extension part 19 can be reliably bent and deformed, and when a load is applied to the front protruding part 21, the weakened part 15 is prevented from being crushed and deformed in the front and rear axial direction as described later. , Can be easily bent and deformed.

Further, a rear protrusion 23 is provided on the rear side of the extension portion 19 in the vehicle front-rear directions F and R. The rear protrusion 23 protrudes toward an intermediate position of the weak body 15 in the front-rear direction of the vehicle, and is disposed in a non-bonding state with the weak body 15. This rear protrusion 23 has a triangular cross-sectional shape, and a tapered shape tapering toward the rear side

It has, and the gap between the weak body part 15 becomes narrower as it is the rear side. It is preferable that the rear protrusion 23 is formed at a position overlapping the front protrusion 21 and the vehicle width direction W when viewed from the front. This is because when the front protrusion 21 abuts against the collision body X, the rear protrusion 23 can be surely displaced in a predetermined direction.

Next, the operation at the time of a collision in the above-described vehicle structure will be described.

In the case of a frontal collision, as shown in FIG. 3(a), at the time of the frontal collision, a bumper reinforcement disposed between the front side members 11 on both sides of the vehicle width direction (W) ( The front edge of 13) (near the position P4 in Fig. 2) becomes an initial contact position with a collision body X'such as a front collision barrier, and abuts. At this time, since the deformation space (S) is secured between the front end portion (21e) of the front protrusion (21) and the collision body (X'), the load is applied to the bumper reinforcement (13) between the front side members (11). Loaded from the front side. Then, the front protrusion part 21 and the extension part 19 deform toward the deformation space S side by inertia, and accordingly, the rear protrusion part 23 is displaced toward the vehicle front side. As a result, since the rear protrusion 23 of the extension part 19 is displaced in a direction away from the weak body 15, the rear protrusion 23 does not abut against the weak body 15 of the front side member 11. It does not hinder the operation of the weak body 15. As shown in Fig. 3(b), deformation proceeds in this state, and the impact load is absorbed by compressive deformation of the weak body portion 15 in the axial direction by the load from the bumper reinforcement 13.

On the other hand, in the case of a small lap collision within a predetermined condition range of a predetermined speed or less, the vehicle width direction (in the vehicle width direction) so as to retract the vehicle from the collision body X by the rigidity of the bumper reinforcement 13 and the extension part 19 The reaction force of W) is obtained.

In the case of a micro-lap collision that exceeds the predetermined condition range, the entire vehicle structure is deformed to absorb the impact load, as shown in Figs. 4A to 4C. First, in the positional relationship shown in Fig. 4(a), the front protrusion 21 of the extension portion 19 of the front side member 11 collides with a colliding body X such as a small wrap barrier, resulting in a small wrap collision. At this time, as shown in Fig. 4(b), the front distal end 21e of the front protrusion 21 abuts at the initial contact position with the collision body X. Thus, the front protrusion 21 is pressed, and the portion where the extension 19 is supported is transformed into a support point.

As a result, the inner tip portion 23e of the rear protrusion 23 provided on the rear side of the extension portion 19 abuts against the weakened portion 15 of the front side member 11. Since the inner distal end 23e is disposed opposite to the intermediate position between the bumper reinforcement 13 and the transmission 17, the inner distal end 23e of the rear protrusion 23 is located at the middle position of the weak body 15 outside. It touches from the direction. Then, the load applied outside the vehicle width direction W than the front side member 11 is transmitted to the front side member 11 through the extension unit 19. That is, the load presses the weak body 15 through the rear protrusion 23.

When the intermediate position of the weak body 15 in the vehicle front-rear direction is pressed by the inner tip 23e of the rear protrusion 23, as shown in FIG. 4(c), the weak body 15 is bent and deformed. However, since the rear projection 23 does not come into contact with the transmission 17, it is not damaged. When the inner distal end 23e of the rear protrusion 23 presses the intermediate position of the weak body 15, the deformation of the weak body 15 absorbs the load at the time of a small lap collision.

According to this vehicle structure, the extension part 19 is provided by protruding the front protrusion part 21 from the bumper reinforcement 13 forward. Therefore, when a load is applied to the extension part 19 from the front collision body X during a small lap collision, even if the relative position of the collision body X and the vehicle body in the vehicle width direction W is different, the front protrusion first (21) abuts against the colliding body (X). Therefore, the input position of the load from the front collision body X to the extension part 19 is stabilized at the time of the micro-lap collision.

Specifically, in Fig. 2, for example, when the front protrusion 21 does not exist, if the relative position of the collision body X and the vehicle is changed by 1% of the vehicle width, the collision body X and the entire structure of the vehicle are The abutting position changes from P1 to P2.

In the case of P1, the weak body part 15 is crushed and deformed in the axial direction, but in the case of P2, the extension part 19 is deformed in the vehicle width direction (W), and the entire vehicle structure is deformed or absorbed when a load is loaded. This fluctuates greatly.

By the way, since the front protrusion 21 exists as in this embodiment, even if the relative position of the collision body X and the vehicle is changed by 1% of the vehicle width, the abutting position between the collision body X and the entire vehicle structure is P3. Does not change, and the input position of the load does not change. Therefore, even if the relative position of the collision body X and the vehicle body in the vehicle width direction W at the time of a small lap collision is different, the load can be measured and absorbed, for example, the extension part 19 or the front side member 11 It is possible to stabilize the load absorbed by the) or the deformation of the front side member 11.

In the overall structure of the vehicle, a weak body 15 is provided in the front part of the front side member 11, and a rear protrusion 23 protruding toward the weak body 15 is provided in the extension part 19, It is provided in a non-bonding state with the weak body part 15. Therefore, when the extension part 19 is deformed at the time of the micro-lap collision, the load is transmitted to the weakened part 15 of the front side member 11 through the rear protrusion 23 and is absorbed. On the other hand, during a frontal collision, the rear protrusion 23 does not hinder the operation of the weak body 15 of the front side member 11 at all. Thereby, the deformation mode can be made different in the case of a frontal collision and a case of a small lap collision, and a deformation mode suitable for each can be set. The front distal end 21e of the front protrusion 21 is disposed on the rear side in the vehicle front-rear direction than the front edge of the bumper reinforcement 13 disposed between the front side members 11, and furthermore, the front distal end 21 ) Is installed in front of the deformation space (S) at the time of a frontal collision. Accordingly, it is possible to reliably prevent the rear protrusion 23 from interfering with the weakened body 15 during a frontal collision.

In addition, since the front distal end 21e of the front protrusion 21 is disposed outside the vehicle width direction than the center position P0 of the rear protrusion 23, the extension 19 is reliably weakened during a small lap collision. It is deformed toward the part 15 side, and shock absorption occurs stably. In the entire vehicle structure of the present invention, when the weak body 15 is in a head-on collision, it can be compressed and deformed in the axial direction.

In addition, when the load applied to the outside of the front side member 11 in the vehicle width direction W is transmitted through the rear protrusion 23, bending deformation is possible. Therefore, the deformation mode of the weakened body 15 can be greatly different in the case of a frontal collision and a case of a small lap collision. Thereby, it is possible to realize stable shock absorption even if the relative position between the collision body X and the vehicle body in the vehicle width direction W during a small lap collision is different without affecting the shock absorption performance during a frontal collision.

In addition, since the rear protrusion 23 has a tapered shape that tapers toward the rear, and the gap between the weak body 15 becomes narrower toward the rear, the load is concentrated on the inner tip 23e of the rear protrusion 23. It can be made, and it is easy to bend and deform the weak body part 15 at the time of a micro-lap collision.

The embodiment of the present invention is not limited to the above-described matters, and may be appropriately changed within the scope of the present invention. In the present embodiment, an example in which the weak body 15 is integrally formed with the front side member 11 and the rigidity in the vicinity of the front end portion is partially reduced has been described, but the present invention is not limited thereto. The weak body portion 15 may be a crash box attached between the body portion having rigidity of the front side member 11 and the bumper reinforcement 13. In addition, the shape of the front protrusion 21 and the rear protrusion 23 can be appropriately changed within a range capable of absorbing the input change of the colliding body, for example, the input change according to the variation of the shape of the barrier during the test.

W: vehicle width direction
F, R: vehicle forward and backward directions
X: Collider
S: deformation space
11: front side member
13: bumper reinforcement
15: weak body
17: transmission
19: extension part
21: front protrusion
21e: front tip
23: rear protrusion
23e: inner tip

Claims (1)

Claim 1
A pair of front side members extending in the vehicle front-rear direction from both sides of the vehicle width direction, and a bumper reinforcement arranged in the vehicle width direction from the front part of the front side member, and the front side of the bumper reinforcement And a front protrusion protruding forward from the bumper reinforcement at a front side and outside of the respective arrangement and installation positions of the pair of front side members; , A rear protrusion protruding rearward from the bumper reinforcement at an outer side of the rear side of each arrangement and installation position of the pair of front side members, and a vehicle width direction than the front side member when a small lap collision A vehicle overall structure in which a load applied to the extension part from the outside is transmitted to the front side member by the rear protrusion through the front protrusion of the extension part.
Claim 2
The method of claim 1,
A front portion of the front side member, a pair of weakened portions for reducing rigidity in the vicinity of the front end portion of the front side member are connected to each other and fixed to the left and right side rear surfaces of the bumper reinforcement.
Claim 3
The method of claim 2,
The weak body part is the entire vehicle structure capable of being compressed and deformed in the axial direction during a frontal collision.
Claim 4
The method of claim 2,
The entire vehicle structure is capable of bending deformation of the weak body part by abutting against the rear protrusion of the extension part during a micro-lap collision.
Claim 5
The method of claim 2,
The entire vehicle structure, wherein the weak body is a crash box mounted between the front side member and the bumper reinforcement.
Claim 6
The method of claim 1,
The entire vehicle structure in which the extension part is integrally formed with the bumper reinforcement to form a part thereof.
Claim 7
The method of claim 1,
The extension portion is gently curved toward the rear of the vehicle body as it faces outward in the vehicle body width direction, and the length dimension along the curvature direction is set to be shorter than the length dimension along the vehicle body front-rear direction of the weak body part.
Claim 8
The method of claim 1,
The extension unit is a vehicle overall structure capable of displacing the rear protrusion in a predetermined direction when the front protrusion comes into contact with a collision body due to a small lap collision.
Claim 9
The method of claim 1,
The front protrusion has a front tip protruding toward the front of the vehicle from the front side of the extension unit, a vertical wall outside the vehicle width direction and a vertical wall inside the vehicle width direction, and the vertical wall outside the vehicle width direction is the vehicle width Vertical inward direction
The entire vehicle structure is formed longer than the wall in the front and rear direction of the vehicle.
Claim 10
The method of claim 1,
The front protrusion has a front end portion of the rear protrusion disposed outside the vehicle width direction than a central position of the rear protrusion.
Claim 11
The method of claim 1,
The front protrusion has a predetermined gap in the rear direction of the vehicle body with respect to the frontmost edge of the bumper reinforcement so that the front end portion thereof is located at a rear side of the frontmost edge of the bumper reinforcement disposed between the front side members. The structure of all vehicles placed and deployed.
Claim 12
The method of claim 1,
The front protrusion has a front end portion of the front side member protruding forward from the front edge of the bumper reinforcement outside the support position of the front side member.
Claim 13
The method of claim 1,
The rear protrusion protrudes from the rear side of the extension part toward an intermediate position in the vehicle front-rear direction of the weak body part, and is disposed in a non-bonding state with the weak body part.
Claim 14
The method of claim 12,
The rear protrusion has a tapered shape that tapers toward a rear side, and a gap between the weak body portion and the weak body portion becomes narrower toward the rear side.
Claim 15
The method of claim 1,
The rear protrusion is an entire vehicle structure disposed and installed in a position overlapping the front protrusion and the vehicle width direction when viewed from the front.
Claim 16
The method of claim 1,
In the case of a frontal collision, the front protrusion and the extension part deform toward the rear of the vehicle, and accordingly, the rear protrusion is displaced toward the front of the vehicle.
Claim 17
The method of claim 1,
In the case of a small lap collision, the front protrusion abuts at the initial contact position with the collision body, and the extension part is pressed toward the rear of the vehicle, whereby the rear protrusion abuts the weak body part, and the weak body part bends deformed.

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