JPH0580916U - Vehicle bumper - Google Patents

Abstract

(57) [Abstract] [Purpose] Accurately absorbs collision energy ranging from a light collision to a large collision to further improve the overall absorption efficiency, and further suppress damage to the vehicle body during a light collision. [Structure] A main body beam 11 fixed to the ends of the left and right stays 3 of the vehicle body is provided, and a resin foam 15 is divided and mounted on the upper and lower parts of the front surface of the main body beam 11.
A bow-shaped sub-beam 17 is horizontally mounted by connecting both ends slidably to the main body beam side at an intermediate position between the upper and lower resin foams 15 near the center of the sub-beam 17 and the main body beam 11. The energy absorber 16 is provided in the region of, and the body beam 11, the resin foam 15 and the sub beam 17 are covered with a skin, and by the deformation of the sub beam 17 and the energy absorber 16 especially in light collision and moderate collision. , The load is absorbed in a state where the collision stroke is small.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bumper for a vehicle, which is provided so as to horizontally project from the front and rear of a vehicle and serves as a buffer in a collision, and more specifically to a bumper that absorbs light collision energy.

[0002]

[Prior Art]

 As one of vehicle safety measures, a bumper (commonly referred to as a 5-mile bumper) that absorbs the collision energy of a 5-mile (8 km / h) concentrated load type light collision has been proposed. This type of bumper mainly has a structure using a resin foam and a backup beam as an energy absorbing means.The light collision energy is mainly absorbed by the resin foam, and the large collision energy is mainly absorbed by the backup beam. Is configured. Therefore, the characteristics of load and collision stroke by the bumper test are as shown by the broken line in FIG. 4, for example.

That is, in the area A where the energy is absorbed by the resin foam, the collision stroke becomes very large even though the load is small, and from this state, the load in the area B where the backup beam absorbs energy increases sharply. Change. Therefore, the efficiency of absorbing the collision energy for a light collision is poor, and in this case, the collision stroke is large and the vehicle body is damaged. There are also problems such as not being able to properly absorb moderate collision energy. Therefore, it is desired to improve such a problem in the bumper of the light collision energy absorption type.

Conventionally, as for the bumper of the light collision energy absorption system, there is a prior art disclosed in, for example, Japanese Patent Laid-Open No. 57-121950. Here, block members are fixed to the front left and right ends of the frame of the vehicle body, and tension beams are stretched between the block members. In addition, a urethane material is joined in front of the tension beam, and the urethane material is covered with a skin. It is shown that this will soften the impact of collision with a pedestrian and prevent damage to the pedestrian.

[0005]

[Problems to be solved by the device]

 By the way, in the above-mentioned prior art, a tension beam is used, but its main purpose is to soften the impact on a pedestrian. Therefore, the efficiency of energy absorption for light collision is a little better than that of the broken line in Fig. 4, and it cannot be said to be sufficient.

The present invention has been made in view of this point, and properly absorbs the collision energy ranging from a light collision to a large collision to further improve the overall absorption efficiency. The purpose is to suppress damage.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a main body beam fixed to the ends of the left and right stays of the vehicle body. An arcuate sub-beam is mounted horizontally at an intermediate position between the upper and lower resin foams near the center by slidably connecting both ends to the main body beam side, and energy is applied to a predetermined area between the sub-beam and the main body beam. An absorber is provided, and the main body beam, the resin foam, and the sub beam are covered with a skin.

[0008]

[Action]

 Based on the above configuration, the energy absorption region is expanded near the center of the main beam due to the sub-beam and the energy absorber, and when a light to medium collision occurs in this part, the load is increased by the sub-beam and energy. It acts on the absorber, and due to these deformations, it is effectively absorbed with less collision stroke.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, the structure of a light impact energy absorption type vehicle bumper will be described. Reference numeral 1 is a rear skirt of a vehicle body, 2 is a rear floor, and bumpers 10 are attached to stays 3 on both left and right sides of the vehicle body. Has been done. In the bumper 10, a main body beam 11 having a rectangular cross section is horizontally fixed to an end portion of the stay 3, and a concave portion 12 is formed in a predetermined area near the center of the main body beam 11 as shown in FIG. A phosphorus hose 13 is attached to the back. A connecting member 14 having a U-shaped cross section is fixed inside the main body beam 11 at a position corresponding to the stay 3, as shown in FIG. In this way, the front surface of the main body beam 11 is vertically divided into two parts, whereby the upper and lower parts of the front surface of the main body beam 11 are respectively divided and the resin foam 15 is adhered along its shape.

An energy absorber 16 of, for example, E / A foam is mounted in a wide region in the vehicle body width direction inside the recess 12 at the upper and lower sides of the main body beam 11 so as to partially project from the main body beam 11. A sub-beam 17 is arranged in contact with the front of the energy absorber 16. The sub-beam 17 is formed in an arcuate shape, and the both ends of the sub-beam 17 are formed in the same position as the left and right stays 3 with the pin 18 and the long hole in a state where the most protruding part at the center is located at the same position as the tip of the resin foam 15. It is slidably connected by 19 and mounted horizontally. The outer sides of the main body beam 11, the resin foam 15, and the sub beam 17 are covered with a skin 20.

In this way, the main beam 11 and the resin foam 15 are arranged on both left and right sides of the bumper 10, and the sub beam 17 and the energy absorber 16 are arranged near the center in addition to these. In the collision near the center, particularly in the case of a light collision and a moderate collision, the energy absorption region is expanded by the sub beam 17 and the energy absorber 16, and the load is quickly transmitted to the main beam 11 in the case of a large collision.

Next, the collision energy absorbing action of this embodiment will be described. First, the case of collision between the left and right sides of the bumper 10 will be described. In a light collision, the load is absorbed by the resin foam 15. In the case of a large collision, the load is mainly absorbed by the main body beam 11, and the characteristics are the same as those of the conventional one indicated by the broken line in FIG.

In the case of a concentrated load type collision near the center of the bumper 10 (including the bumper 10 test of IIHS in the United States), the load concentrates on the sub beam 17. Therefore, in a light collision and a moderate collision, the load applied to the sub-beam 17 causes the sub-beam 17 to bend and slide backward due to the coupling of the pin 18 and the long hole 19, and the concentrated load is dispersed over the entire energy absorber 16. Then, the collision energy is absorbed by the deformation of the sub beam 17 and the energy absorber 16. In this case, when the load is small, the sub-beam 17 is deformed and absorbed in a state where the collision stroke is very small as shown by the solid line L1 in FIG. Then, when the load increases, the energy absorber 16 is deformed, and the collision stroke is increased and smoothly absorbed as shown by the solid line L2 in FIG.

Further, in such a collision, the main beam 11 is not affected at all, and after the collision, the sub beam 17 and the energy absorber 16 automatically return to the original state. Therefore, in the pendulum striking, the sub beam 17 and the energy absorber 16 effectively absorb energy. Further, in this case, the maximum load is restrained in the state where the sub beam 17 is most extended and the pin 18 is engaged with the elongated hole 19, so that the maximum generated load is suppressed.

On the other hand, at the time of a large collision, the load is absorbed in the initial stage as described above, and then the sub-beam 17 is expanded to the maximum extent and the elongated hole 19 thereof engages with the pin 18, so that the main beam 11 together with the connecting member 14 is engaged. , Integrated with stay 3. Then, a large load in this case is rapidly transmitted from the sub beam 17 to the main body beam 11 side, and is absorbed by the entire bumper 10 including the main body beam 11 as shown by a solid line L3 in FIG. In this way, the overall load characteristics from light collision to large collision are as shown by the solid line in Fig. 4, and the load changes with a smooth increasing function with respect to the collision stroke, and the maximum collision stroke Sm is larger than that of the conventional broken line. Becomes smaller.

Although the embodiments of the present invention have been described above, the embodiments are not limited thereto.

[0017]

As described above, according to the present invention, since the sub-beam and the energy absorber are added near the center of the bumper to expand the energy absorption region, it is possible to reduce the impact from light impact to moderate. It is possible to absorb a relatively large load in the case of a collision with a small collision stroke. Therefore, the collision energy absorption efficiency is increased, the safety is improved, and the collision stroke is reduced to prevent damage to the vehicle body. Since the sub-beam is slidably connected to the main beam side, the sub-beam has a good restoring property and the sub-beam and the energy absorber can effectively act. Also, since the sub beam is integrally connected to the main beam side with a predetermined load, the maximum generated load can be suppressed, and since it is connected to the same part as the stay, it can comply with the bumper law of each country.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a diagram showing a relationship between a load and a collision stroke when absorbing collision energy.

[Explanation of symbols]

 3 Stay 10 Bumper 11 Main Beam 12 Recess 14 Connection Member 15 Resin Foam 16 Energy Absorber 17 Sub-beam 20 Skin

Claims (3)

[Scope of utility model registration request] 1. A main body beam fixed to the tips of left and right stays of a vehicle body, and resin foams are separately mounted on upper and lower portions of the front surface of the main body beam, and upper and lower resin foams near the center of the main body beam An arc-shaped sub-beam at an intermediate position between the bodies, the both ends are slidably coupled to the main body beam side and horizontally mounted, and an energy absorber is provided in a predetermined region between the sub-beam and the main body beam, A vehicle bumper characterized in that the body beam, the resin foam, and the sub beam are covered with a skin. 2. The bumper for a vehicle according to claim 1, wherein the main body beam has a recess formed near the center thereof, and an energy absorber is mounted inside the recess so as to partially project. 3. The main body beam according to claim 1, wherein a connecting member is attached to the inside of the same portion as the stay, and both ends of the sub beam are slidably connected to the connecting member by pins and elongated holes. Bumper for vehicle.