JPH06107094A - Mounting structure for bumper for vehicle - Google Patents

Abstract

PURPOSE:To improve impact absorbing performance with a bumper stay without increasing a projecting amount of a bumper body from a car body so much. CONSTITUTION:At a collision of a vehicle, an impact load first acts on a projection part 12c in a bumper reinforce 12. Then, as a space part 18 is formed at the position corresponding to this projection part 12c, that is, the rear of the projection part 12c, the bumper reinforce 12 is rotated around the projection part 12c so that the up and the down sides are rotated in opposite direction, respectively, and deformed into the shape as if the letter U is opened. A bumper stay 14 of the span L3 longer than conventional is crushed and impact absorbing performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle bumper mounting structure, and more particularly to a mounting structure having improved shock absorption in a vehicle collision.

[0002]

2. Description of the Related Art Conventionally, as this type, there is one as shown in FIGS. 6 and 7, for example. That is, the bumper body 1 is composed of a bumper reinforcement 2 and a bumper fascia (not shown).
Is attached to the front side member 4 as a vehicle body strength member via the bumper stay 3.

In the event of a vehicle collision, bumper reinforcement 2
By transmitting the impact load input to the bumper stay 3, the bumper stay 3 is crushed and the impact is absorbed.

Another example of this type is disclosed in Japanese Patent Application Laid-Open No. 4-151141.

[0005]

However, in such a conventional one, as the bumper reinforcement 3 is crushed, the bumper reinforcement 2 comes into contact with the front side member 4, so that the length of L1 is increased. The impact was transmitted to the front side member 4 without being crushed, and the impact could not be properly absorbed. It is also possible to lengthen the bumper stay 3 to absorb the impact, but since the bumper body 1 cannot be projected so much from the vehicle body in terms of modeling, the distance L2 between the bumper reinforcement 2 and the front side member 4 is to some extent. There is a restriction and it cannot be so long, so bump pasty 3
It was not possible to improve the shock absorption due to the crushing.

[0006] Therefore, an object of the present invention is to provide a bumper mounting structure for a vehicle, which can improve the impact absorption by bumper stay without increasing the amount of protrusion of the bumper body from the vehicle body.

[0007]

The present invention has been made in view of the above problems, and a bumper body is formed by covering a resin bumper reinforcement having a predetermined rigidity with a bumper fascia. In a vehicle bumper mounting structure in which a mounting surface portion of a force is mounted on a tip end surface portion of a bumper stay and a base end portion of the bumper stay is mounted on a vehicle body strength member, the tip end surface portion of the bumper stay is inserted into the bumper reinforcement. A recess is formed, and a protrusion projecting from other parts is formed along the vehicle width direction at a substantially central portion in the vertical direction of a mounting surface part formed in the recess on the bumper fascia side of the recess, A bumper for a vehicle in which a space portion is formed at a position corresponding to the protrusion between the bumper force attaching surface portion and the bump pasty tip end surface portion. It is characterized in that the attached structure.

[0008]

[Operation] According to such means, by inserting and attaching the tip end surface portion of the bumper stay in the recess of the bumper reinforcement, the bumper body is prevented from being protruded from the vehicle body more than before, and the bumper stay is made longer. can do.

At the time of a vehicle collision, an impact load is first applied to the protrusion in the bumper reinforcement. Then, by forming the space portion as described above, the bumper reinforcement is deformed so that the upper and lower sides rotate in opposite directions with respect to the protrusion, and the U-shape is opened. Exhibit a shape. As a result, the bumper reinforcement does not hit the body strength side member,
By collapsing a bumper stay that is longer than before, it is possible to improve shock absorption compared to before.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention.

First, the structure will be described. In the figure, reference numeral 11 is a bumper main body, and this bumper main body 11 is made of a resin bumper in which glass fiber is added to polypropylene in an amount of 20 to 30% to improve the rigidity against a slight impact. Reinforce 12 and
The bumper reinforcement 13 covers the bumper reinforcement 12. And this bumper body 11
Are supported by a front side member 15 that is a vehicle body strength member via a pair of bumpers 14.

Specifically, the bumper reinforcement 1
2 has a substantially U-shaped cross section, and the tip surface portion 14a of the bumper stay 14 is inserted into the recess 12a.
Reference numeral 4a denotes a mounting surface portion 12b which is a bottom surface portion of the recess 12a.
It can be attached by a plurality of bolts 16 and nuts 17. Also, this bumper reinforcement 12
On the mounting surface portion 12b, a protrusion 12c protruding forward from other portions is formed in a substantially central portion in the vertical direction along the vehicle width direction by a predetermined length as shown in FIG. The height H1 of the recess 12a of the bumper reinforcement 12 cannot be increased so much in terms of modeling, and is formed to be substantially the same as the height H2 of the front side member 15. Further, in the bumper reinforcement 12, a recess 12d is formed inside the recess 12a and on the back side of the projection 12c. Due to the concave portion 12d, between the bumper reinforcement attachment surface portion 12b and the bumper stay tip surface portion 14a,
The space portion 18 is formed at a position corresponding to the protrusion 12c.

The base end portion 14b of the bump pasty 14
Are inserted and attached into the front side member 15.

Next, the operation will be described.

In such a structure, the tip surface portion 1 of the bumper stay 14 is provided in the recess 12a of the bumper reinforcement 12.
By inserting and attaching 4a, the bumper body 11
The bump pasty 14 can be lengthened without increasing the amount of protrusion of the vehicle body from the conventional one.

In the event of a vehicle collision, bumper reinforcement 1
In case 2, the impact load is first applied to the protrusion 12c. Then, the position corresponding to this protrusion 12c, that is,
Since the space portion 18 is formed behind the protrusion 12c, the bumper reinforcement 12 is, as shown in FIG.
With the protrusion 12c as the center, the upper and lower sides are deformed so as to rotate in opposite directions (the upper side rotates counterclockwise in FIG. 4 and the lower side rotates clockwise in FIG. 4). It looks like an open letter.

As a result, the upper rear end 12e or the lower rear end 12f of the bumper reinforcement 12 on the side of the front side member 15 can be removed even if the bumper reinforcement 14 is retracted and the bumper reinforcement 12 is retracted. I never hit 15. Therefore, the bumper stay 14 having the span L3 longer than the conventional one is crushed well,
It is possible to improve the shock absorbing property as compared with the conventional one. Furthermore,
The bumper reinforcement 12 is made of reinforced plastic with excessive fiber so that the space 18 can be maintained at some collision.
Because the bumper reinforcement 12 breaks near
The opening operation of the bumper reinforcement 12 is increased, and the impact can be reliably transmitted to the bumper stay 14.

FIG. 5 shows a modified example of the above embodiment. In this modified example, a concave portion 14c is formed on the bump pasty front end surface portion 14a side to form a concave portion 12d of the bumper reinforcement 12. As compared with the above embodiment, the larger space portion 19 can be formed, and the deformation of the bumper reinforcement 12 at the time of collision can be further increased.

It goes without saying that a recess may be formed only on the tip surface of the bumper stay to form a space.

[0021]

As described above, according to the present invention, the bumper reinforcement is formed with the recess into which the tip surface of the bumper stay is inserted, and the mounting surface formed in the recess is in the vertical direction. A protrusion protruding from other parts is formed along the vehicle width direction at approximately the center of the, and a space is provided at a position corresponding to the protrusion between the bumper reinforcement attachment surface and the bump pasty tip surface. By forming the bumper body, it is possible to improve the impact absorption due to the bumper stay without increasing the amount of protrusion of the bumper body from the vehicle body, which is a practically useful effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a vehicle bumper mounting structure of the present invention.

FIG. 2 is a perspective view showing a bumper reinforcement, a bumper stay and the like of the same embodiment.

FIG. 3 is an enlarged perspective view of a main part of the same embodiment.

FIG. 4 is a sectional view of a bumper reinforcement showing the operation of the same embodiment.

FIG. 5 is a cross-sectional view corresponding to FIG. 1 showing a modified example of the present invention.

FIG. 6 is a perspective view of a bumper reinforcement, bumper stay, etc. showing a conventional example.

FIG. 7 is a side view of FIG. 6 showing the conventional example.

[Explanation of symbols]

 11 Bumper body 12 Bumper reinforcement 12a Recess 12b Mounting surface 12c Projection 13 Bumper fascia 14 Bumpa stay 14a Tip surface 14b Base end 15 Front side member (body strength member)

Claims (1)

[Claims] 1. A bumper body is constructed by covering a bumper reinforcement made of resin having a predetermined rigidity with a bumper fascia, and a mounting surface portion of the bumper reinforcement is attached to a tip end surface portion of the bumper stay, and a base end portion of the bumper stay is attached. In a vehicle bumper attachment structure adapted to be attached to a vehicle body strength member, the bumper reinforcement is provided with a recess into which a tip end surface portion of the bumper stay is inserted, and the bumper fascia side of the recess is provided in the recess. A protrusion projecting from other portions is formed along the vehicle width direction at a substantially central portion in the vertical direction of the formed attachment surface portion, and the protrusion is provided between the bumper reinforcement attachment surface portion and the bump pasty tip end surface portion. A bumper mounting structure for a vehicle, wherein a space portion is formed at a position corresponding to the portion.