JPH0537721Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of the bumper structure of a vehicle.

[Prior Art] As is well known, many resin materials are used for the bumper skin of vehicle bumpers in order to reduce the weight and improve the shock absorption ability in the event of a collision.

However, the bumper skin made of resin has a problem in that it undergoes large thermal deformation when the temperature rises due to direct sunlight, and particularly in the longitudinal direction, a so-called waving phenomenon occurs.

To solve this problem, for example, in Japanese Utility Model Application Publication No. 61-138653, as shown in FIG.
The resin bumper skin 42 is fixed to the reinforcement 41, and the top wall 4 is attached between the top wall 42a of the bumper skin 42 and the top surface 41a of the reinforcement 41.
Waving prevention member 44 that prevents the waving phenomenon of 2a
A bumper fixing structure has been proposed in which a bumper is interposed.

[Problems to be solved by the invention] However, like the conventional bumper 40 described above, the anti-waving member 44 is interposed between the upper wall portion 42a of the bumper skin 42 and the upper surface portion 41a of the reinforcement 41. In this case, when the lower part of the bumper collides, the upper surface part 41a of the reinforcement 41
and the upper wall portion 42a of the bumper skin 42 are integrated into the vehicle body 45 via the waving prevention member 44.
Because the bumper 40 is pushed up, the impact at the time of a collision cannot be sufficiently alleviated.
There was a problem in that the effect of reducing deformation, damage, etc. compared to No. 5 could not be sufficiently exerted.

[Purpose of the invention] This invention was made in view of the above problems, and prevents the waving phenomenon of the bumper skin under normal conditions by making the bumper skin and reinforcement free in the event of a collision at the bottom of the bumper. Another object of the present invention is to provide a bumper structure for a vehicle that can effectively reduce deformation and damage to the vehicle body due to impact in the event of a collision at the bottom of the bumper.

[Means for Solving the Problems] Therefore, this invention provides a vehicle bumper structure in which at least the upper surface and front surface of a bumper reinforcement arranged at the front end of the vehicle body and extending in the vehicle width direction is covered with a bumper face. A protrusion is provided on the inside of the upper surface of the bumper face to protrude downward and come into contact with the upper surface of the bumper reinforcement, and at the lower end of the protrusion, the bumper reinforcement is attached when the lower part of the bumper collides with the bumper reinforcement. A sliding surface is formed that separates from the upper surface.

[Effect of the invention] According to this invention, a protrusion that protrudes downward and comes into contact with the upper surface of the bumper reinforcement is provided on the inside of the upper surface of the bumper face, and a lower part of the bumper is provided at the lower end of the protrusion. Since we have formed a sliding surface that separates from the upper surface of the bumper reinforcement in the event of a collision, it is possible to prevent the bumper face from waving under normal conditions, but in the event of a collision at the lower part of the bumper, the bumper face and bumper reinforcement By keeping the impact force in a free state and making it difficult for impact force to be directly transmitted to the vehicle body, deformation and damage to the vehicle body in the event of a collision can be reduced.

[Example] Hereinafter, an example of this invention will be described in detail based on the accompanying drawings.

As shown in FIG. 6, a bumper 3 is attached to the front end of the vehicle body 1 in order to cushion the impact during a collision, reduce deformation and damage to the vehicle body 1, and protect the headlights 2, etc. . The bumper 3
As shown in FIGS. 1 and 2, the bumper reinforcement 4, which is placed at the front end of the vehicle body 1 and extends in the vehicle width direction, is made of hard resin and is covered with a bumper face 5 made of resin. It is structured as follows.

The bumper reinforcement 4 has a substantially U-shaped cross-sectional shape, and the inner surface of the bumper face 5 is abutted against the front end of the bumper reinforcement 4 through an adhesive, while the rear part 4c of the bumper reinforcement 4 has a substantially U-shaped cross-sectional shape. It is fixed to a flange portion 7 fixed to the front frame 6 at a portion corresponding to the front frame 6 extending therefrom. That is, a first bracket 8 is disposed on the front surface of the rear portion 4c of the bumper reinforcement 4 to improve the support rigidity of the fixed portion of the reinforcement 4, while a front bracket 8 is disposed on the rear surface of the rear portion 4c. A second bracket 9 is arranged between the flange portion 7 of the frame 6 and the support rigidity of the front frame 6 at the fixed portion, and the first bracket 8 and the flange portion 7 are connected by bolts 11, . . . 11
The bumper reinforcement 4 is fixed to the flange portion 7 of the front frame 6 by tightening with nuts 12, . . . 12.

By the way, in the bumper 3 according to this embodiment, in order to prevent the waving phenomenon of the bumper face 5,
Protrusions 13, . . . 13 that protrude downward from the inside of the upper surface 5a of the bumper face 5 and come into contact with the upper surface 4a of the bumper reinforcement 4 are provided at a plurality of locations in the vehicle width direction.

That is, as shown in FIG.
3, . . . 13 have their upper ends fixed to the upper surface 5a of the bumper face 5, and are provided with an inclined surface 13b at their lower ends. It is in contact with a slope portion 4b provided at the rear.

When the bumper 3 collides at its lower part, as shown in FIG. 4, the bumper face 5 and the bumper reinforcement 4 are deformed by the impact force P from diagonally below, and the slope portion 4b is accordingly deformed. , and is displaced downward so as to rotate around the front end root portion 4d of the upper surface portion 4a of the bumper reinforcement 4. At this time, the inclined surface 13b of the protrusion 13 that comes into contact with the inclined surface 4b is
It will relatively slide downward along the slope of the slope portion 4b, and if the impact force P is relatively large, the slope surface 13b will further slide relatively downward on the slope portion 4b. Eventually, as shown in FIG. 5, it separates from the slope portion 4b.

As described above, according to the present embodiment, the protrusions 13, . Under normal conditions, the inclined surface 13b comes into contact with the inclined surface 4b provided at the rear of the upper surface 4a of the bumper reinforcement 4, but when the bumper 3 collides with the lower part thereof, the inclined surface 13 of the projection 13 Surface 13b
Since the bumper face 5 slides relatively downward on the slope part 4b of the reinforcement and leaves the slope part 4b, normally, the bumper face 5
On the other hand, in the event of a collision with the lower part of the bumper 3, the bumper face 5
By setting the bumper reinforcement 4 and the bumper reinforcement 4 in a free state to make it difficult for the impact force P to be directly transmitted to the vehicle body 1, deformation and damage to the vehicle body 1 during a collision can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the mounting structure of a bumper reinforcement according to an embodiment of the present invention, Fig. 2 is an explanatory view showing the left half of the bumper viewed from above, Figs. Figure 5 is a drawing to explain the state in which the protrusion detaches from the bumper reinforcement. Figure 3 shows the normal state, Figure 4 shows the state before detachment in the event of a collision, and Figure 5 shows the state after detachment. Sectional view along the line ""-"" in Fig. 2, No. 6
Figure 7 is a perspective view of the front of the vehicle with a bumper.
The figure is a sectional view showing a conventional bumper structure. 1...Vehicle body, 3...Bumper, 4...Bumper reinforcement, 4a...Top part, 5...
Bumper face, 13... protrusion, 13b...
Slope.

Claims (1)

[Scope of Claim for Utility Model Registration] In a vehicle bumper structure in which at least the top and front surfaces of a bumper reinforcement arranged at the front end of the vehicle body and extending in the vehicle width direction are covered with a bumper face, A protrusion that protrudes downward and comes into contact with the upper surface of the bumper reinforcement is provided on the inside, and a sliding surface that separates from the upper surface of the bumper reinforcement in the event of a collision with the lower part of the bumper is provided at the lower end of the protrusion. A vehicle bumper structure characterized by forming.