JPH04244449A - Bumper structure for vehicle - Google Patents

Abstract

PURPOSE:To provide a bumper structure for a vehicle which prevents a bumper body from escape deformation during the occurrence of light collision in a so-called one-sided collision state like a case in which one-sided collision with the upper part or the lower part of a bumper occurs. CONSTITUTION:Protrusion parts 9a and 10a which are protruded from an intermediate part 11 and surface deformation of which is easy to make are formed on an upper part 9 or a lower part 10 of the front of a bumper body 5. When a colliding object is collided in an one-sided state with the upper or the lower part of the bumper during light collision, this constitution causes face deformation of the corresponding protrusion parts 9a and 10a to increase a pressure receiving area and effectively parries a shock.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a vehicle bumper structure, and more specifically, a vehicle bumper that prevents the bumper body provided at the front or rear of a vehicle such as an automobile from escaping and deforming in the event of a light collision. It's about structure.

0002

BACKGROUND OF THE INVENTION Bumpers installed in the front or rear portions of vehicles such as automobiles in the vehicle width direction have recently been made of resin materials due to demands for weight reduction. A resin bumper usually consists of a bumper body that is fixed to the vehicle body frame, and a skin material called a bumper face that is placed approximately parallel to the bumper body so as to cover the front surface of the bumper body. It provides the necessary elasticity and strength to absorb the impact of a collision. Incidentally, Japanese Utility Model Application Publication No. 61-58146 describes an example in which such a bumper body is formed by blow molding.

0003

However, in light collisions, a so-called one-sided collision situation may occur in which the collision object hits the upper or lower part of the bumper biasedly. In such a case, the bumper body, together with the bumper face, may be deformed upward or downward in a direction to avoid a collision, and may not be able to sufficiently absorb the impact. For example, in an experiment assuming a collision, as shown in Figure 8,
When the pendulum 2 hits the upper part 3 of the bumper 1 consisting of the bumper body 5 and the bumper face 6,
As shown in the figure, the upper part 3 of the bumper body 5 deforms downward and cannot sufficiently absorb the impact, causing damage to the grille, panel, or headlamp located directly above it. Vehicle body structures such as equipment (not shown) may be damaged. The present invention has been made in consideration of these circumstances, and is designed to prevent the bumper body from escaping and deforming in the event of a light collision in a so-called one-sided collision state, in which the bumper is hit with a bias towards the upper or lower part of the bumper. The object of the present invention is to provide a bumper structure for a vehicle.

0004

[Means for Solving the Problems] According to the present invention, means for solving the above-mentioned problems are constructed as follows, as shown in FIG. 1 or 4, for example. (1) A protruding portion 9a, 10a, or 20, which protrudes from the intermediate portion 11 and whose surface is easily deformed, is formed on the upper portion 9 or lower portion 10 of the front surface of the bumper body 5. (2) The bumper body 5 described above may be formed by blow molding.

[0005]

[Operation] A light collision that hits the upper part 9 or the lower part 10 of the bumper body 5 (double-dashed line in Fig. 1 or the dashed line in Fig. 2,
(see FIG. 4), the corresponding protruding portions 9a, 10a or 20 can easily undergo surface deformation to absorb the impact. In other words, the surface deformation of the protruding portion 9a, 10a or 20 that has hit one side expands the pressure receiving area of that portion, preventing the bumper body 5 from inadvertently escaping and deforming, thereby ensuring that the impact is sufficiently absorbed. Buffered. The bumper body 5 having such protruding portions 9a, 10a, 20, etc. can be easily formed by blow molding.

[0006]

According to the present invention, a protruding portion that protrudes more easily than the middle portion and is easily deformed is formed at the upper or lower portion of the front surface of the bumper body, so that in the event of a light collision,
Even if a colliding object hits the upper or lower part, the surface of that part will easily deform and absorb the impact sufficiently, ensuring the safety of the occupants. Damage to the surrounding car body structure is also prevented. Such a bumper main body can be easily formed by blow molding and can be provided at low cost.

[0007]

EXAMPLES The present invention will be explained in detail below based on examples thereof. The vehicle bumper structure shown in this example is designed to prevent the bumper body from escaping and deforming in the event of a light collision in a so-called one-sided collision, where the bumper is hit with a bias toward the top or bottom of the bumper. The bumper body is constructed as follows so that it can be formed by blow molding. As shown in FIG. 7, the front bumper 1 attached to the front part of the automobile 14 is formed into a gentle circular arc with a slightly convex shape. As shown in FIG. 3, the bumper body 5 is fixed to the front portions of both vehicle body frames 13, 13 by fastening bolts and nuts, and its front surface is covered with a bumper face 6. The bumper body 5 is
As shown in FIG. 1, which shows the central cross section, it has two closed cross sections 7 and 8 formed over the entire width above and below, and the front surface of the upper part 9 and the lower part 10 is located ahead of the middle part 11. Protruding portions 9a, 1 that protrude into a pointed shape and are easily deformed
0a is formed. When the collision object 2 hits the upper part 9 or the lower part 10 of the bumper main body 5, these protruding parts 9a and 10a easily deform in surface as shown in FIG. 2 to increase the pressure receiving area. It is designed to effectively absorb shock. In other words, even in the case of uneven contact, the bumper main body 5 can be prevented from being inadvertently escaped and deformed as in the conventional case (see FIG. 9). This ensures the safety of the occupants and prevents damage to the grille 22, panels, headlamp device 23 (see FIG. 7), etc. arranged around the front bumper 1. To explain in detail, the bumper body 5
(See Figure 1) is formed by blow molding into a substantially U-shaped cross section to have sufficient elasticity and proof strength.
As mentioned above, the upper and lower closed cross sections 7 span the entire width.
, 8, and the vehicle body frame 13,
Washers 16, 16 for attachment to 13 (see Figure 3)
are integrated using the insert method. The upper edge 9a of the upper part 9 of the front surface and the lower edge 1 of the lower part 10
0a, respectively, to form protruding portions that protrude forward and extend laterally, and the upper portion 9 and lower portion 10 thereof are vertically connected by a slightly recessed intermediate portion 11 located between them. The upper edge 9a and lower edge 1 protrude forward in this way.
In an experiment assuming a light one-sided collision, the bumper body 5 having an angle of 0a was moved by the pendulum 2 swung down in the direction of the arrow 17, as shown by the two-dot chain line in FIG. 1 or in FIG. It has been confirmed that when 9 receives a concentrated load, its upper edge 9a immediately undergoes surface deformation as shown in the figure to increase the pressure receiving area and effectively absorb the impact. In other words, the stress in the bumper body 5 itself is effectively dispersed, and the body frames 13, 13 (Fig. 3
The load is reliably transmitted to the vehicle (see reference), which ensures the safety of the occupants and prevents damage to the surrounding vehicle body structure. Note that even if the pendulum 2 hits the upper part 9 and the lower part 10 of the bumper body 5 properly, instead of hitting it unevenly as shown in the figure, the upper and lower edges 9a and 10a are similarly deformed so that they immediately spread upward and downward. Needless to say, a more stable buffering effect can be obtained. The bumper body 5 having the protruding portions 9a and 10a that can easily undergo surface deformation can be relatively easily molded by blow molding. These protruding parts 9a, 6 are not exposed to the outside.
10a can be set to an appropriate size.

FIGS. 4 and 5 show a different embodiment in which the bumper body 5 has a single closed section 18 extending over its entire width, and the upper part 9 of its front surface has a front convexity extending laterally in the form of a ridge. The protruding edge 20 is formed so as to protrude slightly from the intermediate part 11, and this is a protruding part that is easily deformed in surface.The lower part of the protruding edge 20 is slightly inwardly formed to allow the protruding edge 20 to expand more widely. A recessed groove 21 is formed. Even with such a configuration, when the pendulum 2 hits the upper part 9 of the bumper body 5 unevenly, as shown by the two-dot chain line in FIG. can be expanded to absorb shocks stably. In this experiment, the bumper face was omitted and the pendulum 2 was made to directly collide with the bumper body 5.

FIG. 6 shows another embodiment in which protruding edges 20, which are protruding parts, are provided on the upper part 9 and lower part 10 of the bumper body 5. In this case, the lower part 10 of the bumper body 5
Even in the event of a minor collision, such as one-sided collision, the impact can be effectively absorbed. In addition, in the case where the upper part 9 and the lower part 10 collide directly, the upper and lower protruding edges 20, 20 and the groove 21
, 21 are both expanded vertically (not shown), so
Needless to say, it can absorb shock more stably.

As described above, according to the present invention, a protruding part that protrudes more easily than the middle part and is easily deformed is formed at the upper or lower part of the front surface of the bumper body, so that the protruding part is easily deformed relative to the bumper. Even in the case of a light collision in a so-called one-sided collision state where the collision is biased towards the upper or lower side, the bumper body can be prevented from escaping and deforming, and the impact can be sufficiently cushioned. In the embodiment, an example in which the present invention is applied to a front bumper has been described, but it goes without saying that the present invention can also be applied to a rear bumper.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a front bumper in one embodiment of a vehicle bumper structure of the present invention.

FIG. 2 is a sectional view showing a state in which the pendulum hits the upper part of the bumper body.

[Figure 3] An exploded perspective view of the front bumper.

FIG. 4 is a vertical sectional view of a bumper main body in a different embodiment.

[Fig. 5] A perspective view of the bumper body.

FIG. 6 is a vertical cross-sectional view of a bumper main body in another embodiment.

[Fig. 7] Front perspective view of the automobile.

FIG. 8 is a vertical cross-sectional view of a conventional bumper structure.

FIG. 9 is a sectional view showing escape deformation of the bumper body when a pendulum hits the upper part of the conventional bumper.

[Explanation of symbols]

5... Bumper body, 9... Upper part, 9a... Protruding part (upper edge), 10... Lower part, 10a... Protruding part (lower edge), 11...
Middle part, 20...Protruding part (protruding edge).

Claims (2)

[Claims] 1. A bumper structure for a vehicle, characterized in that a protruding portion that protrudes from the middle portion and is easily deformed is formed at the upper or lower portion of the front surface of the bumper body. 2. A vehicle bumper structure, wherein the bumper body according to claim 1 is formed by blow molding.