JP4379135B2 - Bumper reinforcement mounting structure - Google Patents

Description

  The present invention relates to a bumper reinforcement mounting structure, and more particularly to a bumper reinforcement mounting structure that can mount a bumper reinforcement at low cost and can efficiently absorb impact energy at the time of a frontal collision.

  Even if the impact due to the frontal collision is transmitted to the side member extended in the longitudinal direction of the vehicle, a side member reinforcement structure is considered that prevents cross-sectional deformation and increases the amount of shock absorption due to the frontal collision ( For example, Patent Document 1).

  Further, as shown in FIG. 5, when the bumper reinforcement is attached to the front side member, the crash box composed of the first absorbent material and the second absorbent material is placed between the front side member and the bumper reinforcement. There is also known a technique in which an impact caused by a frontal collision is absorbed by being interposed in the front.

5 is a perspective view of the bumper reinforcement mounting structure 11 relating to the background art of the present invention, and FIG. 6 is an exploded perspective view of FIG. In the figure, Fr indicates the front of the vehicle, OUT indicates the outward direction in the vehicle width direction, and UP indicates the vertically upward direction.
The bumper reinforcement 12 is mounted on a front portion of a front side member 13 having a substantially rectangular cross section and extending in the front-rear direction of the vehicle with a crash box including a first absorbent member 14 and a second absorbent member 15 interposed. The

  The front side member 13 is configured by joining an outer panel 17 and a retainer panel 18 to an inner panel 16 having a U-shaped cross section that opens in the outer direction OUT. That is, the upper flange 17a of the outer panel 17 and the upper flange 18a of the retainer panel 18 are joined to the upper flange 16a of the inner panel 16. The lower flange 17b of the outer panel 17 is joined to the lower flange 16b of the inner panel 16. Further, the front flange 17c of the outer panel 17 and the rear flange 18b of the retainer panel 18 are joined.

  A first absorbent member 14 having a U-shaped cross section that opens in the outer direction OUT is joined to the front portion of the inner panel 16. The second absorbent member 15 is joined to the outer side OUT of the first absorbent member 14. That is, the second absorbent member 15 has an upper flange 15a, a rear flange 15b, and a front flange 15c extending in the outward direction OUT, and the rear flange 15b and the front flange 15c are connected with the upper flange 15a interposed therebetween. ing. The upper flange 15a of the second absorbent member 15 is joined to the upper flange 14a of the first absorbent member 14. The rear flange 15 b of the second absorbent member 15 is joined to the front flange 18 c of the retainer panel 18. The front flange 15 c of the second absorbent member 15 is partially joined to the front portion 14 b of the first absorbent member 14. A plurality of through holes 14c are formed in the front portion 14b of the first absorbent member 14 with the front-rear direction of the vehicle as the central axis, and bolts (not shown) are attached together with the corresponding holes 12a of the bumper reinforcement 12. The bumper reinforcement 12 is mounted by inserting it.

  Here, the upper flange 15a, the rear flange 15b, and the front flange 15c of the second absorbent member 15 are the upper flange 14a of the first absorbent member 14, the front flange 18c of the retainer panel 18, and the front portion of the first absorbent member 14, respectively. 14b is bonded by spot welding.

FIG. 7 is a side view schematically showing a change with time when the front surface of the vehicle having the bumper reinforcement mounting structure 11 of FIG. 5 collides with the wall W. FIG. When the bumper 19 mounted on the bumper reinforcement 12 collides with the wall W (see FIG. 7 (a)), the bumper 19 is detached at some time or the bumper 19 is crushed and bumper reinforcement is applied. The front end of the ment 12 collides with the wall W (see FIG. 7B).
Thereafter, the bumper reinforcement 12 and the second absorbent member 15 are crushed. Along with this, the upper flange 14a of the first absorbent member 14 and the upper flange 15a of the second absorbent member 15 joined to the upper flange 14a and spot welded are separated, and the upper flange of the first absorbent member 14 is separated. 14a and the upper flange 15a of the 2nd absorption member 15 become unjoined, and form the opening part H (refer FIG.7 (c)). And the spot which is the spot-welded location peels off and breaks (see FIG. 7D).

On the other hand, the upper flange 15a, the rear flange 15b, and the front flange 15c of the second absorbent member 15 are respectively an upper flange 14a of the first absorbent member 14, a front flange 18c of the retainer panel 18, and a front portion of the first absorbent member 14. Bonding with 14b by arc welding is also performed. Further, when the lower flange extends in the outward direction OUT between the rear flange 15b and the front flange 15c of the second absorbent member 15, the entire circumference of each flange of the second absorbent member 15 is arc welded. Thus, when the front of the vehicle collides with a wall W or the like, the flanges that are welded and joined are prevented from opening as much as possible.
Japanese Utility Model Publication No. 62-97083

Here, when each flange of the 2nd absorption member 15 is joined to each corresponding flange, and spot welding is carried out, cost can be suppressed by carrying out spot welding without performing arc welding.
However, as described with reference to FIG. 7, when the front surface of the vehicle collides with a wall or the like, the upper flange 14a of the first absorbent member 14 and the upper flange 15a of the second absorbent member 15 are peeled off to form the opening H. There is a problem that the impact energy due to the frontal collision cannot be efficiently absorbed. When the absorption rate of impact energy is estimated, the absorption rate is reduced by about 20% and is not negligible.

  On the other hand, when each flange of the second absorbing member 15 is joined to each corresponding flange and the entire surface of the flange is arc welded, when the front collision occurs, the bonded flanges are difficult to open, Impact energy can be absorbed efficiently. However, there is a problem that the cost is about 6 to 7 times higher than that in the case of performing spot welding.

  Accordingly, an object of the present invention is to provide a bumper reinforcement mounting structure that can mount a bumper reinforcement at low cost and efficiently absorbs impact energy at the time of a vehicle front collision.

In order to solve the above-described problem, the first configuration of the present invention is a bumper reinforcement mounting structure in which bumper reinforcement is mounted on the left and right front side members, and is joined to the front portion of each front side member. A first absorbent member, a retainer panel that joins the front part of each front side member to form a closed cross-sectional structure with the first absorbent member, and a second absorbent member that is crowned on the front part of the first absorbent member, provided, the first absorbent member, a flange and a lower flange on joining a retainer panel provided on the retainer panel includes a flange before contacting the secondary absorbent member, the upper flange to be bonded to the first absorbent member, a while extending in the vehicle outward direction, provided the first notch so as to separate between the front flange and the upper flange of said retainer panel to a height direction of the vehicle, the The absorbent member, a mounting surface of the bumper reinforcement, the front flange is provided abutment portion abutting the retainer panel, provided by recessing the rear of the vehicle than the mounting surface abutting portion, the flange and the top of the retainer panel A second notch is provided so as to separate the upper flange of the first absorbent member and the second absorbent member in the vehicle front-rear direction .
With this configuration, at the time of a frontal collision of the vehicle, the bumper reinforcement being crushed by the impact squeezes the second absorbent member, and enters the first notch and enters under the upper flange of the retainer panel. . At this time, unlike what was demonstrated by background art, since the 2nd notch part is formed by the 1st absorption member and the 2nd absorption member, bumper reinforcement can penetrate | invade into a 1st notch part at all. In addition, since the bumper reinforcement penetrates under the upper flange of the retainer panel, the bumper reinforcement is pushed up while the upper flange of the first absorbent member and the upper flange of the retainer panel are joined. Therefore, it is sufficient to perform spot welding by joining the upper flange of the first absorbent member and the upper flange of the retainer panel, and it is not necessary to perform arc welding, so that bumper reinforcement can be mounted at low cost. Moreover, since the upper flange of the first absorbing member and the upper flange of the retainer panel do not open, the impact energy at the time of a vehicle front collision can be efficiently absorbed.

The second configuration of the present invention is a bumper reinforcement mounting structure in which a bumper reinforcement is mounted on each of the left and right front side members that form a closed cross-sectional structure with an U-shaped inner panel and an outer panel. A first absorbent member having a U-shaped cross section joined to the front part of the inner panel, a retainer panel joined to the front part of the outer panel to form a closed cross-sectional structure with the first absorbent member, and the front of the first absorbent member and a secondary absorbent member that is capped in part, the first absorbent member, a flange and a lower flange on joining a retainer panel provided on the retainer panel includes a flange before contacting the secondary absorbent member, a flange on joining the first absorbent member, as well as extend to the vehicle outside direction, between the front flange and the upper flange of said retainer panel to a height direction of the vehicle The first notch such that while provided, the secondary absorbent member, the mounting surface of the bumper reinforcement, provided with a contact portion which the front flange abuts the retainer panel, from the contact portion mounting surfaces A recess is provided at the rear of the vehicle, and a second notch is provided so that the upper flange of the retainer panel, the upper flange of the first absorbent member, and the second absorbent member are spaced apart in the vehicle longitudinal direction. To do.
With this configuration, as in the first configuration of the present invention, the bumper reinforcement being crushed by the frontal collision of the vehicle squeezes the second absorbent member, and enters the first notch, so that the top of the retainer panel is Infiltrate under the flange. At this time, unlike the background art, since the second cutout portion is formed by the first absorbent member and the second absorbent member, the bumper reinforcement can penetrate into the first cutout portion. In addition, since the bumper reinforcement penetrates under the upper flange of the retainer panel, the bumper reinforcement is pushed up while the upper flange of the first absorbent member and the upper flange of the retainer panel are joined. Therefore, since it is sufficient to join the upper flange of the first absorbent member and the upper flange of the retainer panel and perform spot welding, the bumper reinforcement can be mounted at low cost. Moreover, since the upper flange of the first absorbing member and the upper flange of the retainer panel do not open, the impact energy at the time of a vehicle front collision can be efficiently absorbed.

  The height of the first notch provided on the retainer panel is preferably 1/3 to 1/5 of the height of the bumper reinforcement. With this configuration, in the event of a frontal collision, the crushed pamper reinforcement can be efficiently infiltrated into the first notch, and the upper flange of the first absorbent member and the upper flange of the retainer panel remain joined. The impact energy can be absorbed efficiently.

In the present invention, the first absorbent member and the retainer panel joined to the front portions of the left and right front side members form a closed cross-sectional structure, and the second absorbent member is attached to the front portion of the first absorbent member. The retainer panel is provided with a first notch between the upper flange that is joined to the first absorbent member and the front flange that is in contact with the second absorbent member. Moreover, the 2nd notch part is provided between the upper flange of the 1st absorption member joined with the upper flange of the retainer panel, and the 2nd absorption member. As a result, the bumper reinforcement being crushed by the frontal collision of the vehicle squeezes the second absorbent member, enters the first notch, and enters under the upper flange of the retainer panel. At this time, since the second cutout portion is formed by the first absorbent member and the second absorbent member, the bumper reinforcement can enter the first cutout portion. In addition, since the bumper reinforcement penetrates under the upper flange of the retainer panel, the bumper reinforcement is pushed up while the upper flange of the first absorbent member and the upper flange of the retainer panel are joined. Therefore, since it is sufficient to join the upper flange of the first absorbent member and the upper flange of the retainer panel and perform spot welding, the bumper reinforcement can be mounted at low cost. Moreover, since the upper flange of the first absorbing member and the upper flange of the retainer panel do not open, the impact energy at the time of a vehicle front collision can be efficiently absorbed.
Further, by setting the height of the first notch in the range of 1/3 to 1/5 based on the height of the bumper reinforcement, the impact energy at the time of frontal collision can be efficiently absorbed.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a bumper reinforcement mounting structure which is the best mode for carrying out the present invention, and FIG. 2 is an exploded perspective view of FIG. 1 and 2 show the mounting structure to the right side member toward the front of the vehicle, but the same applies to the mounting structure to the paired left side member. In the figure, Fr indicates the front of the vehicle, UP indicates the vertically upward direction, and OUT indicates the outward direction in the vehicle width direction.

The bumper reinforcement mounting structure 1 is a structure in which the bumper reinforcement 3 is mounted on the front portion of the front side member 2 extending in the front direction of the vehicle. The front side member 2 is configured by forming a closed cross-sectional structure with an inner panel 4 having a U-shaped cross section and an outer panel 5. The upper flange 4a of the inner panel 4 extends in the outward direction OUT, and the lower flange 4b extends vertically downward. The outer panel 5 has an upper flange 5a extending in the outward direction OUT so as to be joined to the upper flange 4a of the inner panel 4, and a front flange 5b extending in the outer direction OUT at the front portion of the outer panel 5. ing.
The upper flange 5a of the outer panel 5 is joined to the upper flange 4a of the inner panel 4, and the lower flange 5c of the outer panel 5 is joined to the lower flange 4b of the inner panel 4 to form the front side member 2.

A first absorbent member 6 having a U-shaped cross section is joined to the front portion of the inner panel 4 of the front side member 2. A plurality of grooves 6a are formed in the first absorption member 6, and when the front part of the vehicle collides with a wall or the like, the first absorption member 6 is deformed and absorbs collision energy as much as possible.
Here, the front end of the inner panel 4 of the front side member 2 and the front end of the outer panel 5 do not coincide with each other, and the front end of the inner panel 4 projects from the outer panel 5 toward the vehicle front side. The front part of the outer panel 5 of the front side member 2 is joined to the rear flange 7 a of the retainer panel 7. The front end of the retainer panel 7 substantially coincides with the front end of the first absorbent member 6 joined to the inner panel 4 of the front side member 2.

  The retainer panel 7 has a rear flange 7 a extending outward in the rear part thereof, and is joined to the front flange 5 b which is the front part of the outer panel 5. The retainer panel 7 has an upper flange 7b extending outward in the vehicle front-rear direction. The upper flange 7b is joined to the upper flange 4a of the inner panel 4 and the upper flange 6b of the first absorbent member 6. To do. The retainer panel 7 has a front flange 7c extending in the outer direction OUT at a front portion thereof, and the front flange 7c is brought into contact with a second absorbent member 8 that is attached to a first absorbent member 6 described later.

Here, in the retainer panel 7, a first notch 7A is formed between the upper flange 7b and the front flange 7c. The height of the first notch 7A is preferably in the range of 1/3 to 1/5 based on the height of the bumper reinforcement 3 attached to the second absorbent member 8, and the bumper reinforcement 3 It is optimal that the height is about 1/4 of the height of the.
The retainer panel 7 is joined to the lower flange 4 b of the inner panel 4 and the lower flange 6 c of the first absorbent member 6.

A second absorbent member 8 is attached to the front of the first absorbent member 6.
FIG. 3 is a perspective view in which the second absorbent member 8 is attached to the front portion of the first absorbent member 6. As shown in FIG. 3, the second absorbent member 8 is not joined to the upper flange 6b of the first absorbent member 6, and a second notch 8A is formed.
That is, the first absorbent member 6 is joined with the upper flange 8a, the lower flange 8b, the inner flange 8c, the upper inclined flange 8d, and the lower inclined flange 8e of the second absorbent member 8, whereas The flange is not extended in the outward direction OUT from the upper flange 8a of the second absorbent member 8, and the second absorbent member 8 and the upper flange 6b of the first absorbent member 6 are in the outward direction OUT from the upper flange 8a. A second notch 8A is formed. Here, each flange of the second absorbent member 8, that is, the upper flange 8a, the lower flange 8b, the inner flange 8c, the upper inclined flange 8d, and the lower inclined flange 8e are all extended rearward of the vehicle.

  The second absorbing member 8 is formed with an abutting portion 8f with which the front flange 7c of the retainer panel 7 abuts below the second notch portion 8A. As shown in FIGS. 2 and 3, the contact portion 8f is formed to be recessed toward the rear of the vehicle so as to absorb an impact from the vehicle front direction Fr. Further, the second absorbent member 8 is provided with a through hole 8g having the vehicle longitudinal direction as the central axis, and a bumper reinforcement is inserted by inserting a bolt (not shown) together with the hole 3a of the bumper reinforcement 3. Mento 3 is attached.

Hereinafter, in a vehicle having the pamper reinforcement mounting structure 1, a change with time of the diameter of the pan bar reinforcement mounting structure 1 when the front surface of the vehicle collides with a wall will be described.
FIG. 4 is a side view schematically showing a change with time of the diameter of the bumper reinforcement mounting structure 1 when the front surface of the vehicle having the bumper reinforcement mounting structure 1 of FIG. 1 collides with the wall W.

  When the front end of the bumper 9 attached to the bumper reinforcement 3 collides with the wall W (see FIG. 4 (a)), the bumper 9 is detached with some time signature, or the bumper 9 is crushed to bumper reinforcement. The front end of the ment 3 collides with the wall W (see FIG. 4B). At this time, the bumper reinforcement 3 starts to be crushed in the longitudinal direction of the vehicle.

Thereafter, the bumper reinforcement 3 is crushed and enters the first notch 7A of the retainer panel 7 and enters. The retainer panel 7 enters under the upper flange 7b of the retainer panel 7 while being crushed in the vehicle longitudinal direction (see FIG. 4C). At this time, unlike the bumper reinforcement mounting structure 11 of FIG. 5, the second notch 8A is formed by the first absorbent member 6 and the second absorbent member 8, so that the bumper reinforcement 3 is completely absent. It can invade part 7A. Further, since the bumper reinforcement 3 enters under the upper flange 7b of the retainer panel 7, the bumper reinforcement 3 is pushed up vertically upward while the upper flange 6b of the first absorbent member 6 and the upper flange 7b of the retainer panel 7 are joined. Can do.
As a result, the direction of the impact force at the time of the front collision of the vehicle can be changed, and the upper flange 6b of the first absorbent member 6 and the upper flange 7b of the retainer panel 7 can be joined by spot welding. It is not necessary to join the upper flange 6b of 6 and the upper flange 7b of the retainer panel 7 by arc welding.

  Thereafter, the bumper reinforcement 3, the first absorbent member 6 and the like are crushed, and the upper flange 6b of the first absorbent member 6 and the upper flange 7b of the retainer panel 7 are deformed while following the deformation caused by the crush. (Refer FIG.4 (d)).

  As described above, in the bumper reinforcement mounting structure in which the bumper reinforcement 3 is mounted with the first absorbent member 6, the retainer panel 7, and the second absorbent member 8 interposed with respect to the front side member 2, The first absorbing member 6, the retainer panel 7 and the second absorbing member 8 can be efficiently absorbed with respect to the member 2 by spot welding, without surface welding by arc welding. become.

  The embodiment of the present invention described above is merely an example of the present invention, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention.

It is a perspective view which shows the bumper reinforcement mounting structure which is the best form for implementing this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is the perspective view which attached the 2nd absorption member to the front part of the 1st absorption member. It is the side view which showed the time change of the bumper reinforcement mounting structure when the front surface of the vehicle which has the bumper reinforcement mounting structure of FIG. 1 collides with the wall. It is a perspective view of the bumper reinforcement mounting structure regarding the background art of the present invention. FIG. 6 is an exploded perspective view of FIG. 5. It is the side view which showed the time change of the bumper reinforcement mounting structure when the front surface of the vehicle which has the bumper reinforcement mounting structure of FIG. 5 collided with the wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bumper reinforcement mounting structure 2 Front side member 3 Bumper reinforcement 3a Hole 4 Inner panel 4a, 5a, 6b, 7b, 8a Upper flange 4b, 5c, 6c, 8b Lower flange 5 Outer panel 5b, 7c Front flange 6 1st Absorbing member 6a Groove 7 Retainer panel 7A First notch 7a Rear flange 8 Second absorbing member 8A Second notch 8c Inner flange 8d Upper inclined flange 8e Lower inclined flange 8f Abutting portion 8g Through hole 9 Bumper

Claims (3)

In the bumper reinforcement mounting structure with the bumper reinforcement attached to the left and right front side members,
A first absorbent member joined to the front part of each front side member;
A retainer panel that joins with a front portion of each front side member to form a closed cross-sectional structure with the first absorbent member;
A second absorbent member crowned on the front of the first absorbent member,
The first absorbent member is provided with an upper flange and a lower flange to be joined to the retainer panel,
To the retainer panel comprises a flange before contacting with the secondary absorbent member, the upper flange joined with the flange on the first absorbent member, as well as extend to the vehicle outside direction, and the front flange of said retainer panel A first notch is provided so as to be separated from the upper flange in the height direction of the vehicle ,
The second absorbent member is provided with a mounting surface for the bumper reinforcement and a contact portion with which the front flange of the retainer panel abuts, and the corresponding contact portion is recessed from the mounting surface toward the rear of the vehicle,
Bumper reinforce, characterized in that a second notch so as to separate and the upper flange of the upper flange and the first absorption member of the retainer panel, between the secondary absorbent member in the longitudinal direction of the vehicle Ment attachment structure. In the bumper reinforcement mounting structure where the bumper reinforcement is mounted on the left and right front side members that form a closed cross-sectional structure with an inner panel and an outer panel having a U-shaped cross section,
A first absorbent member having a U-shaped cross section joined to the front portion of the inner panel;
A retainer panel that joins with a front portion of the outer panel to form a closed cross-sectional structure with the first absorbent member;
A second absorbent member crowned on the front of the first absorbent member,
The first absorbent member is provided with an upper flange and a lower flange to be joined to the retainer panel,
To the retainer panel comprises a flange before contacting with the secondary absorbent member, thereby extending the upper flange to be bonded to the first absorbent member, a vehicle outward direction, and the front flange and the upper flange of said retainer panel A first notch is provided so as to be spaced apart in the height direction of the vehicle ,
The second absorbent member is provided with a mounting surface for the bumper reinforcement and a contact portion with which the front flange of the retainer panel abuts, and the corresponding contact portion is recessed from the mounting surface toward the rear of the vehicle,
A bumper, characterized in that a second notch is provided so as to be spaced apart in the vehicle front-rear direction between the upper flange of the first absorbent member joined to the upper flange of the retainer panel and the second absorbent member. Reinforcement mounting structure.   The bumper reinforcement mounting structure according to claim 1 or 2, wherein the upper flange of the first absorbing member and the upper flange of the retainer panel are joined by spot welding.

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