JPH0615316B2 - Car bumper structure - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a bumper structure for an automobile, and more particularly to a bumper structure for an automobile improved with an impact absorbing member that absorbs impact energy received from outside the vehicle.

[Prior art]

Conventionally, for example, in Japanese Utility Model Laid-Open No. 54-174149, No. 9
Disclosed is a bumper structure for an automobile as shown in FIGS. This bumper structure includes a bumper reinforcement 2 in the vehicle width direction of an automobile 1, a shock absorbing member 3 arranged on the front surface of the bumper reinforcement 2 so as to be convex in the front direction of the vehicle, and the shock absorbing member. 3 at the intermediate position in the vertical direction on the front surface of the vehicle body 3 and the recess 4 formed so as to have the same sectional area in the longitudinal cross section in the vehicle body front-rear direction from the substantially central portion in the vehicle body width direction to both side corner portions. The bridge rib 5 thus formed and the bumper cover 8 covering the impact absorbing member 3 are included. The bumper cover 8 is attached to the bumper reinforcement 2 with a retainer 6 and bolts 7. In this bumper structure, when the automobile 1 collides from the front with a wall as indicated by reference numeral 9 in FIG. 9,
As shown in FIG. 13, the impact absorbing member 3 was deformed in the direction of reducing the cross-sectional area of the recess 4 of the impact absorbing member 3 to absorb the impact energy.

[Problems to be Solved by the Invention]

However, in the conventional automobile bumper structure as described above, since the impact absorbing member 3 is arranged so as to be convex in the front direction of the vehicle body, when the impact absorbing member 3 receives impact energy from the front, In FIG. 9, A ′,
The impact energies received by the positions B'and C'are different, the A'position receives the maximum impact energy, and the amount of the impact energy received in the order of the B'position and the C'position becomes smaller. Further, in this case, the recess 4 for efficiently absorbing the impact energy by deforming the impact absorbing member 3 has a cross-sectional area of a longitudinal section in the vehicle front-rear direction of each of A ', B', and C '. Since it is formed so that the positions are uniform, A ′,
As shown in FIG. 14, the maximum load is generated at the positions B ′ and C ′, and the maximum load is generated at the position A ′.
It becomes smaller in the order of C'position. As described above, in the conventional bumper structure, the load generated differs depending on the position of the shock absorbing member 3,
There is a problem that the impact absorbing member 3 as a whole has a low impact energy absorbing efficiency.

[Object of the Invention]

The present invention has been made in view of the above-described conventional problems, and when impact energy is received from the front of the vehicle body, the load difference generated at each position of the impact absorbing member is reduced to be uniform. An object is to improve the impact energy absorption efficiency of the impact absorbing member.

[Means for solving problems]

The present invention relates to a bumper reinforcement in the vehicle width direction, a shock absorbing member arranged on the front surface of the bumper reinforcement, and a recess formed in the vehicle width direction at an intermediate position in the vertical direction of the front surface of the shock absorbing member. And a bumper cover for covering the shock absorbing member and supporting the shock absorbing member on the bumper reinforcement for a bumper structure of an automobile. The object is achieved by configuring the area so as to gradually decrease from the substantially central portion in the vehicle body width direction to the outer side in the vehicle body width direction.

[Action]

In the present invention, since the cross-sectional area of the longitudinal section in the vehicle body front-rear direction of the recess formed in the impact absorbing member of the automobile bumper is configured to be gradually reduced from the substantially central portion in the vehicle body width direction to the vehicle body width direction outer direction, The difference in the load generated at each position of the absorbing member can be made small and uniform, and the impact energy absorbing efficiency of the impact absorbing member can be improved.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. In this embodiment, as shown in FIGS. 1 to 6, the bumper reinforcement 12 in the vehicle width direction of the automobile 10 is used.
And a shock absorbing member 14 disposed on the front surface of the bumper reinforcement 12 so as to be convex in the front direction of the vehicle body.
A recess 16 formed in the vehicle width direction at an intermediate position in the vertical direction on the front surface of the shock absorbing member 14; and a bumper cover 18 for covering the shock absorbing member 14 and supporting the shock absorbing member 14 on the bumper reinforcement 12. In the automobile bumper structure having the above, the recess 16 is configured such that the cross-sectional area of the longitudinal section in the vehicle body front-rear direction is gradually reduced from the substantially central portion in the vehicle width direction toward both corners. is there. When the recess 16 of the impact absorbing member 14 receives impact energy from the front, as shown in FIG. 7, the recess 16 is deformed in the direction of reducing the cross-sectional area of the recess 16 to efficiently absorb the impact energy. Has been The recess 16 is formed so that the depth in the front-rear direction of the vehicle body and the width in the up-down direction of the vehicle body are maximized at a substantially central portion in the vehicle body width direction. The depth in the front-rear direction and the width in the vertical direction of the vehicle body are gradually reduced. The overall width of the recess 16 in the vehicle width direction is approximately 1/3 of the overall width of the shock absorbing member 14, and is formed symmetrically in the widthwise center of the shock absorbing member 14. The recess 16 is formed with a bridging rib 20 that connects the recess 16 in the vertical direction of the vehicle body and restricts the shock absorbing member 14 from opening in the vertical direction of the vehicle body. The impact absorbing member 14 is made of urethane foam. The bumper cover 18 includes a retainer 22 and bolts 24,
It is attached to bumper reinforcement 12 by nut 26. The bumper reinforcement 12 has the side members 3 in the vicinity of both ends in the vehicle width direction via the brackets 28.
It is linked to 0. The bumper reinforcement 12 is formed by welding a front side member 12A and a rear side member 12B to form a closed cross section. Here, when the automobile 10 collides head-on with a wall as indicated by reference numeral 32 in FIG. 1, the relationship between the load generated in the shock absorbing member 14 and the deformation amount is P for the load and S for the deformation amount.
Then, P = kS, but the coefficient k generally increases as the cross-sectional area of the recess 16 decreases, as shown in FIG. In the case of a frontal collision with the wall 32 of the automobile 10 as described above,
At the position of the impact absorbing member 14 shown by A in FIG. 1, since the tip end of the convex portion of the impact absorbing member 14 is located, when impact energy is generated from the front of the vehicle body, Therefore, the largest impact energy is applied, and the impact energy becomes smaller in the order of B and C. On the other hand, the impact energy absorbed by the impact absorbing member 14 is proportional to the product of the load and the amount of deformation. In this embodiment, the cross-sectional area of the longitudinal section of the recess 16 formed in the shock absorbing member 14 in the vehicle front-rear direction is gradually reduced from the substantially central portion in the vehicle width direction to the outer side in the vehicle width direction, that is, the above coefficient. Since k is configured to increase outward from the central portion, the amount of shock energy absorbed by the shock absorbing member 14 decreases in the order of A, B, and C, but the load generated is the shock absorbing member. The position of 14 in the width direction does not cause a great change. That is, the load generated at each of the positions A, B, and C of the shock absorbing member 14 becomes a curve with a small inclination as shown by the broken line in FIG. 8, and thus the shock energy absorbing efficiency of the shock absorbing member 14 is improved. be able to.

【The invention's effect】

Since the present invention is configured as described above, when impact energy is generated from the front of the vehicle body, the difference in the load generated at each position of the impact absorbing member where the impact energy is generated is reduced to absorb the impact energy of the impact absorbing member. It has an excellent effect that efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an automobile bumper structure according to the present invention, FIG. 2 is a front view of the same embodiment, FIG. 3 is a perspective view showing an impact absorbing member of the same embodiment, and FIG. ~ Fig. 6 is the second
FIG. 7 is an enlarged sectional view taken along line IV-IV to VI-VI in FIG. 7, FIG. 7 is an enlarged sectional view similar to FIG. 4 having a bumper structure after impact energy is applied from the front of the vehicle body, and FIG. 8 is the same. FIG. 9 is a diagram showing a relationship between a load and a deformation amount generated in the impact absorbing member of the embodiment, FIG. 9 is a plan view showing a conventional automobile bumper structure,
10 is a front view of the same, FIG. 11 is a perspective view showing a shock absorbing member of the bumper structure, FIG. 12 is an enlarged sectional view taken along the line XII-XII of FIG. 10, and FIG. FIG. 12 is an enlarged cross-sectional view similar to FIG. 12 showing the bumper structure after the addition of the above, and FIG. 12 ... Bumper reinforcement, 14 ... shock absorbing member, 16 ... recess, 18 ... bumper cover.

Claims (1)

[Claims] 1. A bumper reinforcement in the vehicle width direction, a shock absorbing member arranged on the front surface of the bumper reinforcement, and a shock absorbing member formed in the vehicle width direction at an intermediate position in the vertical direction of the front surface of the shock absorbing member. In a bumper structure of an automobile having a recess and a bumper cover for covering the shock absorbing member and supporting the shock absorbing member on the bumper reinforcement, the recess is provided with a longitudinal cross section in a vehicle body front-rear direction. A bumper structure for an automobile, characterized in that a cross-sectional area is gradually reduced from a substantially central portion in the vehicle width direction toward an outer direction in the vehicle width direction.