JP2005001430A - Vehicle body front structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front structure for an automobile capable of protecting a frame on the vehicle body side at the time of a collision with a rigid body while protecting a pedestrian at the time of a collision with the pedestrian. <P>SOLUTION: The vehicle body front structure is provided with an upper impact absorber 6 extending in the vehicle width direction between an upper part in a bumper facia 5 and a bumper armature 3 of the automobile, and a first impact absorber 8 extending in the vehicle width direction between a lower part in the bumper facia 5 and a frame on the vehicle body side (radiator core support 1). The first impact absorber 8 is fixed to the front surface 7a of a bracket 7 extending in the vehicle width direction, and a second impact absorbing member 9 is interposed between the rear surface 7c of the bracket 7 and the frame on the vehicle body side (radiator core support 1). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body front structure that prevents a vehicle from being caught under a pedestrian's knee when the vehicle collides with a pedestrian.
[0002]
[Prior art]
Conventionally, when a car collides with a pedestrian, a vehicle body front structure that reduces the degree of knee damage that the pedestrian suffers by mainly suppressing the bending angle and shear displacement of the knee is known ( Patent Document 1).
According to the present invention, the lower shock absorber is provided in the lower part (spoiler part) in the bumper facia, and when the automobile collides with a pedestrian, the lower shock absorber causes the vehicle to recoil outward from the pedestrian's knee. The pedestrian's foot is prevented from being caught under the body of the pedestrian and below the knee by giving force to the pedestrian.
[0003]
[Patent Document 1]
JP 2002-283937 A (page 1-3, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in the conventional invention, since the lower shock absorber is fixed to the bracket directly fixed to the vehicle body side frame (radiator core lower), the impact force when the automobile collides with the rigid body is absorbed by the lower shock absorber. It is transmitted directly to the vehicle body side frame through the body, and as a result, there is a possibility that the vehicle body side frame may be damaged even in a relatively slight collision with a rigid body.
Since the mainstream radiator core support is integrally formed by injection molding using resin or glass fiber reinforced resin, the labor and repair costs for replacing the radiator core support are both the manufacturer and the user. It will be a heavy burden for you.
[0005]
The present invention has been made paying attention to the above-mentioned problems, and its purpose is to protect the pedestrian at the time of a collision with a pedestrian and to protect the body side frame at the time of a collision with a rigid body It is to provide a vehicle front structure that can be used.
[0006]
[Means for Solving the Problems]
In the first aspect of the present invention, the upper shock absorber extending in the vehicle width direction between the upper part in the bumper fascia of the automobile and the bumper armature, and between the lower part in the bumper fascia and the vehicle body side frame. A vehicle body front structure including a first shock absorber extending in a vehicle width direction, wherein the first shock absorber is fixed to a front surface of a bracket extending in the vehicle width direction, and a rear surface of the bracket A second shock absorbing member is interposed between the vehicle body side frame and the vehicle body side frame.
[0007]
According to a second aspect of the present invention, in the vehicle body front structure according to the first aspect, the bracket is formed in a hat-shaped cross-sectional shape having an opening on the lower side, and is in contact with the hat-shaped front surface and the front-side bottom. The first shock absorber is fixed, and the second shock absorber is fixed in contact with the U-shaped rear surface and the rear bottom.
[0008]
According to a third aspect of the present invention, in the vehicle body front structure according to the first or second aspect, the bracket is fixed to a plate-like first hanging member fixed in a state of being sandwiched between the bumper armature and the bumper stay. It is characterized by.
[0009]
According to a fourth aspect of the present invention, in the vehicle body front portion structure according to any one of the first to third aspects, a plate-like shape in which the vehicle width direction central portion of the bracket is fixed to the bumper armature vehicle width direction central portion. It fixed to the 2nd drooping member of this.
[0010]
According to a fifth aspect of the present invention, in the vehicle body front structure according to any one of the first to fourth aspects, the hat-like rear bottom portion of the bracket is fixed to the vehicle body side frame so as to be detachable rearward. Features.
[0011]
The invention according to claim 6 is the vehicle body front structure according to any one of claims 1 to 5, wherein the vehicle body side frame is a radiator core support.
[0012]
Operation and effect of the invention
In the first aspect of the invention, the upper shock absorber extending in the vehicle width direction between the upper part in the bumper fascia of the automobile and the bumper armature, the lower part in the bumper fascia, and the vehicle body side frame A first shock absorber extending in the vehicle width direction is provided therebetween.
The first shock absorber is fixed to the front surface of the bracket extending in the vehicle width direction, and a second shock absorbing member is interposed between the rear surface of the bracket and the vehicle body side frame.
[0013]
Therefore, when a car collides with a pedestrian, as explained in the prior art, the first impact absorber applies a reaction force to the outside of the pedestrian below the pedestrian's knees to pay the pedestrian's feet. This prevents the pedestrian from getting caught in the lower part of the vehicle body and under the knee.
In addition, the impact force when the automobile collides with the rigid body is transmitted in the order of the first shock absorber, the bracket, the second shock absorber, and the vehicle body side frame in the lower part of the bumper fascia. If the bracket or the bracket is bottomed out due to the limit of the allowable deformation amount, the second shock absorber can absorb the shock force and greatly reduce the shock force transmitted to the vehicle body side frame. The destruction of the side frame can be avoided.
[0014]
In the invention of claim 2, the bracket is formed in a hat-like cross-sectional shape having an opening on the lower side, and the first shock absorber is fixed in a state of being in contact with the hat-like front surface and the front bottom portion, Since the second shock absorber is fixed in contact with the hat-shaped rear surface and the rear bottom, the first shock absorber, the bracket, and the second shock absorber extending in the vehicle width direction are straight in the front-rear direction. As a result, the impact force transmitted rearward from the first shock absorber can be efficiently absorbed.
[0015]
In the invention according to claim 3, since the bracket is fixed to the plate-like first hanging member fixed while being sandwiched between the bumper armature and the bumper stay, the impact force when the automobile collides is It is possible to disperse the bumpy stay via one hanging member, and as a result, it is possible to reduce the impact force transmitted to the second shock absorber, that is, the impact force transmitted to the vehicle body side frame.
Further, since the plate-like first hanging member is only interposed between the bumper armature and the bumper stay, there is no influence on the crushing control of the side member including the bumper armature and the bumper stay.
[0016]
In the invention according to claim 4, since the center part in the vehicle width direction of the bracket is fixed to the plate-like second hanging member fixed to the center part in the vehicle width direction of the bumper armature, the mounting strength at the center part of the bracket is high. In addition to being stable, a stable shock absorbing ability can be exhibited regardless of the direction of the impact force when the automobile collides.
Further, it is possible to disperse the impact force from the bracket to the bumper armature via the second hanging member, and as a result, the impact force transmitted to the second shock absorber, and consequently the impact force transmitted to the vehicle body side frame is reduced. be able to.
[0017]
In the invention according to claim 5, since the hat-like rear side bottom portion of the bracket is fixed to the vehicle body side frame so as to be detachable rearward, the mounting state of the bracket can be stabilized, and the first shock absorber can be secured. Can be fixed stably.
In addition, since the rear bottom portion can be separated rearward from the vehicle body side frame, it is possible to avoid the bracket core from being removed from the vehicle body side frame and the radiator core lower being deformed and broken at the time of a car collision.
[0018]
In the invention according to claim 6, since the vehicle body side frame is a radiator core support, the radiator core support that is integrally formed of resin or glass reinforced fiber resin can be usually protected, and as a result, the radiator core support can be protected. The labor and repair cost for replacement can be reduced, which is suitable for both users and manufacturers.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the vehicle body front structure of the present invention will be described below.
[0020]
<Embodiment 1>
Embodiment 1 of the present invention will be described below.
FIG. 1 is an exploded perspective view showing a front body structure A of a vehicle according to Embodiment 1 of the present invention, and FIG. 2 is a side end view showing the front body structure of the vehicle according to the present embodiment.
[0021]
As shown in FIGS. 1 and 2, the vehicle body front structure A of the present embodiment is formed on the radiator core side 1 a, 1 a of the radiator core support 1 that is integrally formed of resin or glass fiber reinforced resin. Side member mounting portions 1b and 1b are provided, and bumper stays 2 and 2 are provided at the front end portion of the side member (shown by a two-dot chain line in FIG. 2) via the side member mounting portions 1b and 1b.
A bumper armature 3 is provided at the front end of the bumper stays 2 and 2 with first hanging members 4 and 4 (described later) sandwiched therebetween.
Further, between the bumper armature 3 and the bumper fascia 5 (see FIG. 2), an upper shock absorber 6 integrally formed of a foamed material such as polyurethane foam or polypropylene foam extends in the vehicle width direction. Is provided.
Further, a protrusion 6 a is formed on the rear surface of the upper shock absorber 6, and the protrusion 6 a is fitted and fixed in the fixing hole 3 a of the bumper armature 3.
[0022]
The first drooping member 4 has a U-shaped cross-sectional shape with a metal plate opened to the rear side, and is extended downward. The upper side is sandwiched between the bumper stay 2 and the bumper armature 3. Are fixed together at four bolt fastening portions B1.
Further, the first hanging member 4 is bent backward from the middle portion to form a bent portion R, and the lower side of the bent portion R is formed by two bolt fastening portions B2 on a rear surface 7c of the bracket 7 described later. It is fixed.
The bracket 7 is integrally formed of glass fiber reinforced resin, and has a hat-like cross-sectional shape that opens downward and extends in the vehicle width direction. The ribs L (illustrated by broken lines) are formed to enhance the rigidity.
Further, a first shock absorber 8 is provided in contact with the hat-shaped front surface 7 a and front side bottom portion 7 b of the bracket 7.
A protrusion 8 a is formed on the rear surface of the first shock absorber 8, and the protrusion 8 a is fitted and fixed in the fixing hole 7 e of the bracket 7.
[0023]
On the other hand, the front surface of the first shock absorber 8 is formed in a shape along the inside of the spoiler portion S formed in the lower part of the bumper fascia 5.
The first shock absorber 8 is integrally formed of a foam such as a polyurethane foam or a polypropylene foam, like the upper shock absorber 6.
[0024]
And the 2nd shock absorber 9 is interposed between the rear surface 7c of the said bracket 7, and the radiator core support 1 as a vehicle body side frame.
Specifically, the front side of the second shock absorber 9 is provided in contact with the rear surface 7c and the rear bottom portion 7d of the bracket 1 excluding the fixing bolt fastening portion B2.
On the other hand, the rear side of the second shock absorber 9 is fixed in a state of being fitted between upper and lower flange portions K1, K2 formed to project forward from the front side of the radiator core lower 1c. 2 A protrusion 9a formed on the rear surface of the shock absorber 9 is fitted and fixed in the fixing hole 1d of the radiator core lower 1c.
[0025]
The second shock absorber 9 is integrally formed of a foam such as a polyurethane foam or a polypropylene foam similar to the upper shock absorber 6, but its rigidity is higher than that of the first shock absorber 8. Is also set high.
[0026]
The first shock absorber 8, the bracket 7, and the second shock absorber 9 thus configured are formed in substantially the same shape in height and width, and are arranged on a straight line in the front-rear direction, so that the front The input impact force is accurately transmitted in order from the first shock absorber 8 to the rear, and as a result, a stable absorption capability can be exhibited.
Reference numeral 10 denotes an under cover for mainly protecting the first and second shock absorbers 8 and 9 from the outside.
[0027]
Hereinafter, the operation and effect of the vehicle body front part structure A of the vehicle according to the present embodiment will be described.
In the vehicle body front structure A of the present embodiment, the impact force when the vehicle collides with the pedestrian is such that the first shock absorber 8, the bracket 7, the first hanging member 4, It is transmitted in the order of the second shock absorber 9 and the radiator core lower 1c.
At this time, the impact force is mainly absorbed by the first shock absorber 8 and is also absorbed to some extent by the bent portion R of the bracket 7 and the first hanging member 4. As a result, the pedestrian's knee is tilted toward the vehicle. Thus, a reaction force is applied so as to rotate outwardly of the vehicle, thereby preventing the vehicle from being caught downward.
Further, since the rear surface of the first shock absorber 8 has a protrusion 8a inserted and fixed and is in surface contact with the front surface 7a of the bracket 7, the stress is not concentrated compared to the fastening with bolts, and the impact force is reduced. Can be absorbed efficiently.
[0028]
On the other hand, the impact force when the automobile collides with a rigid body is transmitted in the order of the upper shock absorber 6, the bumper armature 3, the first drooping member 4, and the bumper stay 2 in the upper part of the Pampa Facia 5, and at the lower part, The first shock absorber 8, the bracket 7, the first drooping member 4, the second shock absorber 9, and the radiator core lower 1c are transmitted in this order.
At this time, when the first impact absorber 8 reaches the limit of the allowable deformation amount due to the impact force, the second impact absorber absorbs the impact force and is transmitted to the radiator core lower 1c. The force is reduced and consequently the destruction of the radiator core support 1 is avoided.
[0029]
Further, the rear surface of the second shock absorber 9 has the protrusion 9a inserted and fixed so as to be in surface contact with the radiator core lower 1c, so that stress is not concentrated and the impact force can be efficiently generated compared with the fastening with bolts. Can absorb.
[0030]
Further, the impact force is also transmitted and distributed to the bumper stay 2 via the bracket 7 and the first hanging member 4, and as a result, the impact force transmitted to the radiator core lower 1c is reduced to protect the radiator core support 1. Can be planned.
The second impact absorber 9 is set so as to absorb at least the impact force until the impact force begins to be absorbed by the bumper stay 2. The force is absorbed mainly by the bumper stay 2.
[0031]
Therefore, in the vehicle body front structure A of the present embodiment, when the vehicle collides with the pedestrian, the impact force is absorbed by the first shock absorber and the vehicle is placed below the pedestrian's knees. It is possible to prevent a pedestrian's knee injury and entanglement below the vehicle by applying a reaction force so as to rotate in the direction of the vehicle.
[0032]
Further, when the automobile collides with the rigid body, the second shock absorber 9 absorbs the impact force transmitted through the bracket 7 and the first hanging member 4 and can prevent the radiator core support 1 from being broken. As a result, it is possible to prevent the vehicle body side frame from being broken by a slight collision with the rigid body as in the conventional invention.
[0033]
Further, since only the plate-like first hanging member 4 is interposed in each of the bumper stay 3 and the bumper art 4, the bumper stay 2 and the bumper art 3 of course adversely affect the crushing control of the side member. There is nothing.
[0034]
<Embodiment 2>
The second embodiment of the present invention will be described below.
3 is an exploded perspective view showing the front body structure B of the automobile according to Embodiment 1 of the present invention, FIG. 4 is a side end view showing the front body structure of the automobile according to this embodiment, and FIG. FIG.
[0035]
The vehicle body front structure B of the vehicle of the present embodiment is that except that the rear side bottom portion 7d of the bracket described in the first embodiment extends rearward and is fixed to the radiator core lower 1c so as to be detachable rearward. Since it is the same as that of the said Embodiment 1, the same code | symbol is attached | subjected about the same member and the description is abbreviate | omitted.
[0036]
As shown in FIGS. 3 and 4, the vehicle body front structure B of the present embodiment has a rear bottom portion 7d of the bracket that extends rearward, and an end portion of the bracket on the radiator core lower 1c such as a lock nut. It is provided so as to be detachable backward by the attachment 24.
Specifically, as shown in FIGS. 3 and 5, the rear bottom portion 7d extends rearward, and three fixing holes 21 are formed at the end thereof in the vehicle width direction. A long hole 23 opened rearward is formed in the bottom portion 22 of the radiator core lower 1c corresponding to 21 and a fixture 24 such as a lock nut is inserted into the fixed hole 21 and the long hole 23 as shown in FIG. By fixing, the bracket 7 is fixed to the radiator core lower 1c so as to be detachable rearward.
In the present embodiment, since the bottom portion of the second shock absorber 9 is protected as the rear bottom portion 7d extends rearward, the flange portion K2 is omitted, and the undercover 10 The shape is simplified.
[0037]
Hereinafter, the operation and effect of the vehicle body front structure B of the vehicle according to the present embodiment will be described.
In the vehicle body front structure B configured as described above, the bracket 7 is fixed to the radiator core lower 1c, whereby the mounting state of the bracket 7 can be stabilized.
[0038]
When the vehicle collides with a rigid body and a certain impact force is applied to the bracket 7 backward, the fixture 24 moves together with the bracket 7 away from the long hole 24 of the bottom 22 of the radiator core lower 1c, and moves backward. As a result, destruction of the radiator core lower 1c can be avoided.
[0039]
Therefore, in the vehicle body front structure B of the present embodiment, since the bracket 7 is fixed to the radiator core lower 1c so as to be detachable rearward, the mounting of the bracket 7 can be fixed in a stable state.
[0040]
Further, since the bracket moves rearward together with the fixture 24 when the automobile collides, there is no possibility that the radiator core support 1 is broken by fixing the bracket 7 and the radiator core lower 1c.
[0041]
<Embodiment 3>
The third embodiment of the present invention will be described below.
FIG. 6 is an exploded perspective view showing the front body structure C of the automobile according to Embodiment 1 of the present invention, and FIG. 7 is a side end view showing the front body structure of the automobile according to this embodiment.
[0042]
The vehicle body front structure C of the present embodiment is provided with the second hanging member 30 for connecting the bracket 7 described in the first embodiment and the central portion in the vehicle width direction of the bumper armature 3 to each other. Since this is the same as that of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted.
[0043]
As shown in FIGS. 6 and 7, the vehicle body front structure C of the present embodiment is fixed to a second hanging member 30 in which the center portion in the vehicle width direction of the bracket 7 is fixed to the rear surface of the bumper armature 3. ing.
Specifically, the second drooping member 30 has a U-shaped cross-sectional shape with a metal plate opened to the rear side and extends downward, and the upper side is a central portion in the vehicle width direction of the bumper armature 3. Both are fixed to the back surface by one bolt fastening part B3.
Further, the lower side of the second hanging member 30 is bent backward from the middle portion to form a bent portion R1, and further, the lower side of the bent portion R1 is a flange formed at the center portion in the vehicle width direction of the bracket 7. The bumper armature 3 and the center part in the vehicle width direction of the bracket 7 are joined to each other by being fixed to the part F by one bolt fastening part B4.
[0044]
Hereinafter, the operation and effect of the vehicle body front structure C of the present embodiment will be described.
In the vehicle body front structure C configured as described above, since the vehicle width direction center portions of the bumper armature 3 and the bracket 7 are coupled to each other by the second hanging member 30, the vehicle is a pedestrian or a rigid body. Can be efficiently absorbed by dispersing the impact force on both the bumper armature 3 and the bracket 7, and as a result, the impact force transmitted to the second shock absorber 9 is reduced and the radiator core support 1 is reduced. Contribute to the protection of
[0045]
Moreover, the rigidity in the center part of the automobile can be improved, and a stable shock absorbing ability can be exhibited regardless of the input direction of the collision.
[0046]
Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to the present embodiment, and the present invention can be applied even if there is a design change or the like without departing from the gist of the invention. include.
[0047]
For example, although the vehicle body side frame is the radiator core support 1 in the present embodiment, it may be a side member or other vehicle body side frame.
[0048]
The materials and shapes of the first and second shock absorbers, the bracket 7 and the rib L can be set as appropriate.
Moreover, about the shape of the protrusions 6a, 8a, 9a and the fixture 24, the attachment direction, and the number of installation, it can set suitably.
[0049]
Furthermore, as shown in FIG. 8, the second shock absorber 9 is configured to be interposed in contact with the center of the rear surface 7c of the bracket 7 in the vehicle width direction so as to supplement the strength of the center of the vehicle. Is of course conceivable.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a vehicle body front structure of an automobile according to a first embodiment of the present invention.
FIG. 2 is a side end view showing a vehicle body front structure of an automobile according to the present embodiment.
FIG. 3 is an exploded perspective view showing a vehicle body front structure of an automobile according to a second embodiment of the present invention.
FIG. 4 is a side end view showing the front body structure of the automobile according to the present embodiment.
FIG. 5 is a diagram illustrating a fixture according to the present embodiment.
FIG. 6 is an exploded perspective view showing a front body structure of an automobile according to a third embodiment of the present invention.
FIG. 7 is a side end view showing the front body structure of the automobile of the present embodiment.
FIG. 8 is an example showing other shapes of the second shock absorber 9;
[Explanation of symbols]
A, B, C Car body front structure B1, B2, B3, B4 Bolt fastening part F, K1, K2 Flange part L Rib R Bending part S Spoiler part 1 Radiator core support 1a Radiator core side 1b Side member 1c Radiator core Lower 1d, 3a, 7e Fixing hole 2 Bumper stay 3 Bumper armature 4 First hanging member 5 Bumper fascia 6 Upper shock absorber 6a, 8a, 9a Projection 7 Bracket 7a Front 7b Front side bottom 7c Rear side 7d Rear side bottom 8 Shock absorber 9 Second shock absorber 10 Undercover 21 Fixing hole 22 Bottom 23 Long hole 24 Mounting tool 30 Second hanging member

Claims (6)

An upper shock absorber extending in the vehicle width direction between the upper part of the automobile bumper fascia and the bumper armature;
A first shock absorber extending in the vehicle width direction between the lower part in the bumper fascia and the vehicle body side frame;
In the front body structure of an automobile equipped with
Fixing the first shock absorber to the front surface of a bracket extending in the vehicle width direction;
A vehicle body front structure for an automobile, wherein a second shock absorbing member is interposed between a rear surface of the bracket and a vehicle body side frame. In the vehicle body front structure according to claim 1,
The bracket is formed into a hat-shaped cross-sectional shape with an open bottom,
The first shock absorber is fixed in contact with the hat-shaped front surface and the front bottom portion, and the second shock absorber is fixed in contact with the U-shaped rear surface and the rear bottom portion. A vehicle body front structure characterized by The vehicle body front part structure according to claim 1 or 2,
A vehicle body front structure for an automobile, wherein the bracket is fixed to a plate-shaped first hanging member fixed in a state of being sandwiched between a bumper armature and a bumper stay. In the vehicle body front part structure according to any one of claims 1 to 3,
A vehicle body front part structure for an automobile, wherein a central part of the bracket in the vehicle width direction is fixed to a plate-like second hanging member fixed to the central part of the bumper armature in the vehicle width direction. In the vehicle body front part structure according to any one of claims 1 to 4,
A vehicle body front structure for an automobile, wherein a hat-like rear bottom portion of the bracket is fixed to a vehicle body side frame so as to be detachable rearward. In the vehicle body front part structure according to any one of claims 1 to 5,
A vehicle body front structure, wherein the vehicle body side frame is a radiator core support.

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