JPH06286536A - Bumper reinforcement structure body - Google Patents

Abstract

PURPOSE:To provide a light weight bumper reinforcement structure body having high mechanical strength in the longitudinal direction and excellent durability. CONSTITUTION:A bumper reinforcement structure body comprises a bumper reinforcement 1 formed of a hollow material made of aluminum or of its alloy, and a reinforcement body 2 formed of a hollow material made of aluminum or its alloy, which is mounted on the center in the longitudinal direction of the front part of the bumper reinforcement, and which is shorter than the bumper reinforcement 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper lean hose structure for a bumper device mounted on an automobile.

[0002]

2. Description of the Related Art A bumper device used for an automobile is a bumper skin, a bumper lean hosement which is located on the rear side of the bumper skin and to which the bumper skin is attached, and a rear side of both longitudinal ends of the bumper lean hosement. The bumper lean hosement is attached and a pair of stays fixed to side members provided on the body of the automobile.

Recently, some of the bumper apparatuses use a bumper lean hosement made of a hollow shape member made of extruded aluminum or its alloy. A bumper skin made of synthetic resin is attached to the front surface of the bumper lean hosement, and a rear surface is attached to the stay.

The bumper lean hosement made of a hollow shape member made of aluminum or its alloy is lightweight and can easily have high strength because it can be molded by extrusion even if it has a complicated cross section. There is an advantage.

[0005]

However, the longitudinal elastic modulus of aluminum is about 1/3 of the longitudinal elastic modulus of iron. For this reason, a bumper lean hose made of a hollow shape member made of aluminum or its alloy may not sufficiently absorb energy when an impact force is applied from the outside at the time of collision.

Therefore, it is possible to increase the wall thickness of the hollow shape member forming the bumper lean hosement to improve the impact resistance property, but in this case, the weight increases and it becomes unsuitable as a bumper and the price becomes low. The bumper lean hosement molded with resin, which has the problem of increasing the thickness, can increase the thickness of the center part of the bumper lean hosement at the time of molding, thus suppressing the deformation by increasing the thickness of the easily deformable part. can do. However, the bumper lean hosement made of aluminum or its alloy hollow section cannot change the dimension of the cross section of the hollow section midway in the longitudinal direction at the time of production, and the cross section of the hollow section is long. Uniform across all directions.

The stays for mounting the bumper lean hoses are fixed to the side members provided on both the left and right sides of the vehicle body of the automobile. Therefore, the stays are located at both longitudinal ends of the bumper lean hoses and are fixed. ing.

Therefore, when an impact force is applied to the bumper lean hosement from the outside, the deformation in the central portion of the bumper lean hosement in the longitudinal direction is larger than that at both ends.

Therefore, when an automobile collides, the center portion of the bumper lean hosement is largely deformed, and as a result, it is often necessary to replace the bumper lean hosement.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a bumper lean hosement structure which is lightweight, has high mechanical strength, and is excellent in durability.

[0011]

In order to achieve the above object, a bumper lean hosement structure of the present invention is a bumper lean hosement formed of a hollow shape member made of aluminum or an alloy thereof, and this bumper lean hose. And a reinforcing member formed of a hollow shape member made of aluminum or an alloy thereof, which is attached to the central portion in the longitudinal direction of the front part of the ment.

[0012]

The bumper lean hose stay used in the bumper lean hosement structure of the present invention is formed of a hollow shape member made of aluminum or its alloy. The hollow profile forming the bumper lean hosement has no inner pillars inside, the middle pillar is the letter of one day, the middle pillars are the two letters in a row, and the middle pillar is two crossed fields. Etc. can be arbitrarily selected. The buckling strength can be increased by increasing the wall thickness of the hollow shape member. The left and right ends of the bumper lean hosement are processed into a curved shape so that they can be attached to a bent stay surface sufficiently.

The reinforcing member is formed of a hollow shape member made of aluminum or its alloy. The hollow shape material that forms the reinforcing body is optional, such as one without a central pillar inside, the character of the day with one central pillar, the character of two middle pillars lined up, the shape of a field with two middle pillars intersecting, etc. You can choose to.

Examples of the reinforcing body include a hollow hollow member cut to a height of a bumper lean hosement and a hollow hollow member having a height of a bumper lean hosement cut to a predetermined length.

The length of the reinforcing member along the longitudinal direction of the bumper lean hosement is shorter than the length of the bumper lean hosement, and the length of the central part of the bumper lean hosement can be sufficiently reinforced. For example, about 1/3 of the total length of the bumper lean hosement.

The hollow material used for the reinforcing member is made of a medium-strength material such as 6063 of aluminum alloy or 6NO1.
Widely applicable to 000 series high strength materials.

As a method of attaching the reinforcing body to the bumper lean hosement, there are methods such as welding, bonding, fitting and bolting. Among these methods, adhesion is simple, and when the reinforcing body is deformed by a collision, it is possible to remove it and replace it with a new one.

In the bumper lean hosement structure of the present invention, the bumper lean hosement has the reinforcing member made of a hollow shape member made of aluminum or its alloy attached to the central portion in the longitudinal direction. It is possible to reinforce the central portion of a bumper lean hosement formed of a hollow shape member made of aluminum or its alloy having a constant size and shape.

Like the bumper lean hosement, the reinforcing member is lightweight because it is formed of a hollow shape member made of aluminum or its alloy, and the weight thereof can be greatly increased even when it is attached to the bumper lean hosement. It is possible to easily manufacture a material having a complicated cross-sectional shape that does not have high strength by extrusion molding.

Therefore, when the left and right ends of the bumper lean hosement are attached to the stays and the respective stays are fixed to the side beams provided on the vehicle body of the automobile, a large portion is also provided in the center part in addition to the both ends of the bumper lean hosement. The mechanical strength of the bumper lean hose can be prevented from being deformed even when an external impact is applied to the bumper lean hosement, or the reinforcing material can be deformed to such an extent that it can be damaged. it can.

When the reinforcing material is detachably attached to the bumper lean hosement, the deformed reinforcing material is removed,
Instead, a new reinforcement can be attached to the bumper lean hosement, which is much more economical than replacing the entire bumper lean hosement.

In general, when an automobile crashes and an impact force is applied to the bumper provided on the vehicle body, the conventional bumper lean hose provided on the bumper has a large degree of shape deformation of the entire bumper lean hosement. The central part of the lean reinforcement is extremely buckled,
Bending deformation often occurred only in the central part.

Since only the both ends of the bumper lean hosement are fixed by the pair of stays, the impact force generated on the front surface of the bumper lean hosement is the largest at the center portion in the longitudinal direction without support. This is because it acts, and this portion is deformed preferentially.

In comparison with this, the bumper lean hosement structure of the present invention has a large bending rigidity in the central portion of the bumper lean hosement. For this reason, at the time of a collision, the reinforcing body is first deformed and most of the impact force is absorbed, and the impact force acting on the bumper lean hosement is very small.
As a result, the bumper lean hosement is less likely to be deformed. Even when the impact test was conducted in the 5-mile test, the deformation of the linear bumper lean hose was almost eliminated.

Therefore, the wall thickness of the hollow shape member can be made thinner than before, and the weight of the perlean hosement can be reduced. That is, the perlean homentment structure of the present invention is a combination of the perlean hosement and the reinforcing body, but the weight is not so different from the perlean hosement alone, and the deformation due to impact is about half that of the conventional one. Is becoming smaller.

[0026]

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

One embodiment of the present invention is shown in FIGS.
Will be described with reference to.

In FIG. 1, 1 is a perlean hosement and 2 is a reinforcement.

As shown in FIG. 2, the perlean hosement 1 is formed of a hollow shape member made of aluminum or an alloy thereof, and the hollow shape member has a center pillar 3 formed in an eye shape. Both ends of the pearl lean hosement 1 are curved.

As shown in FIG. 3, the reinforcing member 2 is formed of a hollow shape member made of aluminum or its alloy. For example, one of the reinforcing bodies 2 has a semicircular shape, the other has a flat surface, and two middle pillars 4 are arranged inside. The reinforcement 2 has the same height as that of the perlean hosement 1, for example, about 200 to 8
It has been cut to 00 mm.

The reinforcing body 2 is arranged and adhered to the central portion of the front portion of the lean hosment 1 along a direction perpendicular to the longitudinal direction thereof.

Another embodiment of the present invention, which will be described with reference to FIGS. 4 and 5, is the same as the lean hosment 1 of the above-described embodiment. As shown in FIG. 5, the reinforcing member 5 is obtained by cutting a long hollow member to the same height as the lean hosement 1, for example, 200 to 300 mm. Both ends of the reinforcing body 5 are obliquely cut. The reinforcement body 5 is arranged in the central portion of the lean hosement 1 along the length direction thereof, and is adhesively fixed by an adhesive.

Although not shown, an absorber made of foamed resin is attached to the front of the lean hosement 1, and a fisher bumper is attached to the front of the absorber.

A specific example will be described.

Concrete Example: 1 The structure shown in FIG. 1 was manufactured.

Width 80 mm, height 100 mm, length 1400 m
m, wall thickness 2.0 mm, weight 2.7 kg, tensile strength 350
A hollow extruded shape member having N / mm ² and a proof stress of 320 N / mm ² was prepared, and both ends of this shape member were bent to manufacture a lean hosement.

A hollow extruded shape member having a wall thickness of 1.5 mm, an upper surface curvature R of 600 mm, a length of 200 mm, a weight of 210 g, and a center pillar having an eye shape is prepared. The hollow extruded shape member has a lean hose height of 100 mm. A reinforcing body was manufactured by cutting into pieces.

The reinforcing member was bonded to the center of the lean hoses with an epoxy adhesive. Material strength is tensile strength 3
It was 00 N / mm ² and the yield strength was 260 N / mm ² .

Next, the structure manufactured as described above is used for 1700
We attached it to a Kg vehicle body, attached a foam shock absorber made of polypropylene with a thickness of 30 mm to the surface of the lean hosement, and performed a bendurum impact test at 5 mph to investigate the deformation behavior of the bumper.

As a result, there was almost no deformation of the lean hosement of FIG. Although the hollow portion of the reinforcing body had a hollow portion of about 3 to 5 mm, there was almost no change in the overall shape including the absorber after the collision test.

Concrete Example: 2 The structure shown in FIG. 4 was manufactured.

The same lean hoses as those used for the structure shown in FIG. 1 were manufactured. Width 80mm,
Height 100 mm, length 300 mm, wall thickness 1.5 mm, weight 0.
23 kg, 5 mm tensile strength 300 N / mm ² , yield strength 260 N
A hollow extruded shape member of / mm ² was prepared, and both ends of this hollow extruded shape member were cut obliquely to manufacture a reinforcing body. This reinforcement was adhered to the center of the lean hoses with an epoxy adhesive.

Next, the structure manufactured as described above is used for 1700
It was attached to a Kg vehicle body, a foam impact absorbing material made of polypropylene with a thickness of 30 mm was attached to the surface of the lean hosement, and a deformation behavior of the bumper was investigated by a bendurum impact test of 5 mph.

As a result, almost no deformation was observed in the lean horsement. The hollow part of the reinforcement is 3 to 5 mm
Although there were some recesses, there was almost no change in the overall shape including the absorber after the collision test.

Comparative Example Only a lean hosment having the same specifications as those of the concrete examples 1 and 2 was prepared, and the same tests as those of 1 and 2 were performed on this lean hosment. As a result, the lean hosement caused buckling deformation in the central part. This deformation was large with a depth of about 19 mm with respect to the original shape, resulting in the need to replace the lean hosement.

The present invention is not limited to the above-described embodiments, but can be modified in various ways.

[0047]

As described above, according to the bumper lean hose structure of the present invention, the hollow profile of aluminum and its alloy is provided at the center of the bumper lean hose with the hollow profile of aluminum and its alloy. Since a reinforcement made of is attached, the mechanical strength of the central part of the bumper lean hosement with both ends of the bumper lean hose fixed with a stay is increased, and the deformation of the bumper lean hosement is mitigated or suppressed in the event of a collision. In addition, durability and reliability can be improved.

Moreover, since the reinforcing body is made of a hollow shape member of aluminum and its alloy, it is lightweight and requires only a slight increase in the weight of the entire bumper lean hose structure, and a complicated structure capable of obtaining high strength. A cross-sectional shape can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bumper lean hosement structure according to an embodiment of the present invention.

FIG. 2A is a front view showing the bumper lean hosement of the embodiment. (B) is an end view showing the bumper lean hosement of the embodiment.

FIG. 3 is a view showing a reinforcing body of the same embodiment.

FIG. 4 is a perspective view showing a bumper lean hosement structure according to another embodiment.

FIG. 5 is a view showing a reinforcing body of the same embodiment.

[Explanation of symbols]

 1 ... Bumper lean hosement, 2 ... Reinforcement.

Claims (1)

[Claims] 1. A bumper lean hose member formed of a hollow shape member made of aluminum or an alloy thereof, and a hollow member made of aluminum or an alloy member thereof, which is attached to a central portion in a longitudinal direction of a front portion of the bumper lean hose member. Bumper lean hosement structure, comprising: