JPH05451Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a bumper reinforcement structure for an automobile that makes it possible to reduce weight while avoiding electrolytic corrosion caused by contact between dissimilar metals.

Conventional technology As a conventional bumper reinforcement, the fifth,
The structure shown in Figure 6 has been proposed (see Japanese Utility Model Application Publication No. 135349/1983). That is, a pair of bumper stays 1, 1 serving as supporting members are disposed at the left and right front end portions of the vehicle body (not shown), and the bumper stays 1, 1 have bumper reinforcements extending in the vehicle width direction. 2 is arranged in a cross-linked manner. The bumper reinforcement 2 is made of metal and is formed into a closed cross-sectional shape in which an inner panel 3 and an outer panel 4 are joined. An exterior component storage chamber 7 is formed on both sides of the bumper reinforcement 2, and includes an opening 5 formed in the outer panel 4, a bulge 6 formed in the inner panel 3, and the like. The exterior parts storage chamber 7 accommodates a fog lamp 8 which is an exterior part of the vehicle body. Furthermore, the bumper reinforcement 2 includes the outer panel 4.
A fascia 9 is attached to cover the exterior surface of the fascia 9, and an opening 10 is formed in the fascia 9 at a portion corresponding to the exterior component storage chamber 7.

Problems to be Solved by the Invention However, in such a conventional structure, since the inner panel 3 and outer panel 4 that constitute the bumper reinforcement 2 are made of iron, it is necessary to reduce the weight of the bumper. facia 9
Even if it were made of resin, the expected weight reduction effect could not be obtained. Of course, if the entire bumper reinforcement 2 is molded from a lightweight aluminum material, the weight of the bumper reinforcement 2 can be reduced, and together with the use of resin for the fascia 9, the weight of the bumper can be reduced. obtain. However, since aluminum material is more expensive than iron material, molding the entire bumper reinforcement 2 out of aluminum material not only increases the material cost, but also increases the cost of the bumper reinforcement 2 as shown in Figure 7. The bumper stay 1 made of iron and the bumper reinforcement 2 made of aluminum come into contact with each other, and electrolytic corrosion due to local batteries occurs at the contact portion. Therefore, in order to avoid this electrolytic corrosion, it is necessary to form an insulating coating over a wide area on the contact surface between the bumper stay 1 and the bumper reinforcement 2, which adds to the material cost. The cost of anti-corrosion measures required for forming the film is added, resulting in a significant cost increase.

The present invention was developed in view of these problems, and aims to provide a bumper reinforcement structure that makes it possible to reduce the weight while reducing the material costs and rust prevention cost. be.

Means for Solving the Problems In order to solve the above-mentioned problems, in the present invention, an aluminum support member, which constitutes the central part of the bumper reinforcement, is attached to the iron support members arranged on both the left and right sides of the vehicle body. A center reinforcement is bridged, and both ends of the center reinforcement are connected to the support member via fastening members, while both ends of the bumper reinforcement are connected to both ends of the bumper reinforcement. Constituent corner members are arranged in series, and one end of the corner member is inserted between the center reinforcement and the support member.

Function In the above configuration, the bumper reinforcement is
Since only the center reinforcement, which is bridged between the support members on both the left and right sides of the vehicle body, is made of aluminum, the usage rate of aluminum for the entire bumper reinforcement can be suppressed, and the center reinforcement, which is made of aluminum, and steel The support members are insulated by one end of a resin corner member inserted between the two support members, and electrolytic corrosion due to contact between dissimilar metals is avoided. Therefore, the possibility of electrolytic corrosion occurring due to contact between dissimilar metals remains only at the contact portion between the fastening member and the center reinforcement and support member. Therefore, when the fastening member is made of iron, the contact portion of the fastening member with the center reinforcement (made of aluminum), and when the fastening member is made of aluminum, the support member ( Electrolytic corrosion can be completely prevented by insulating only the parts that come in contact with steel (made of iron), and the area that requires anti-corrosion measures is limited to a small area. In addition, in a bumper reinforcement consisting of an aluminum center reinforcement and a resin corner member, the aluminum The manufactured center reinforcement ensures sufficient rigidity and maintains its original function as a bumper reinforcement.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIGS. 1 to 4, shock absorbers 12 serving as supporting members are provided on both left and right sides of the front end of the vehicle body 11, and an iron fixing plate 13 is provided at the tip of the shock absorber 12. is provided. A bumper reinforcement 14 extending in the vehicle width direction is installed between the shock absorbers 12, and the bumper reinforcement 14 has a center reinforcement 15 made of aluminum forming a central portion. , and a pair of corner members 16 molded from a resin material forming both end portions. Said center reinforcement 1
5 has a closed cross-sectional shape having front and rear walls 17, 18 and upper and lower walls 19, 20, and the upper and lower walls 19, 20 have coupling holes 21, and the rear wall 18 has fixing holes 2.
2... has been developed. The fixing holes 22...
Made of iron with olive chromate coating on the surface 39
is formed, and a caulking nut 23 constituting one of the fastening members is fitted therein. The caulking nut 23
are inserted through the fixing holes 22 of the fixing plate 13 through iron washers 40, and screwed together with the iron bolts 25 constituting the other fastening member. 15 is supported at both ends by shock absorbers 12, 12, and is bridged between the shock absorbers 12, 12. On the other hand, the corner member 16 has the opening 26 and the side opening 27 as shown clearly in FIG.
It has upper and lower walls 28, 29, and side walls 3.
Exterior parts storage chamber 3 separated by 0 and rear wall 31
2 is formed. The upper and lower walls 28, 29 are provided with coupling holes 21, and the rear wall 31 is provided with fixing holes 22, component mounting holes 33, and receiving portions 34.
is formed. and corner members 16, 16
As shown in FIG. 4, the end portion of the center reinforcement 15 is received in the side opening 27;
As shown in FIG.
The center reinforcement 15 and the center reinforcement 15 are jointly fastened to the fixing plate 13 by bolts 25 inserted into the fixing holes 22. The center reinforcement 15 and the corner member 16 are connected to each other by a fastening member (not shown) through connection holes 21 formed in the upper walls 19, 28 and the lower walls 20, 29, respectively. .

A fascia 24 that covers the center reinforcement 15 and the corner member 16 is attached to the bumper reinforcement 14, and a portion of the fascia 24 that faces the front opening 26 of the exterior component storage chamber 32 is attached to the bumper reinforcement 14. A mounting hole 35 is formed therein. A fog lamp 38 consisting of a lens 36 and a lamp housing 37 is accommodated in the exterior parts storage chamber 32, and the rear end of the lamp housing 37 is positioned in the receiving part 34 to attach the parts. A fastening member (not shown) inserted through the use hole 33 connects the rear wall 31 of the corner member 16.
is fixed.

In this embodiment with the above configuration, the bumper reinforcement 14 is composed of the center reinforcement 15 made of aluminum and the corner members 16 made of resin, so it is significantly heavier than the one made of steel. In addition, the usage rate of expensive aluminum material for the entire bumper reinforcement 14 can be suppressed, and material costs can be reduced. Furthermore, since the end portion 41 of the corner member 16 molded from an insulating resin is inserted between the aluminum center reinforcement and the iron fixing plate, the center reinforcement is insulated. It is not necessary to form an insulating film on the contact surface between the fixing plate 15 and the fixing plate 13 in order to prevent the occurrence of electrolytic corrosion caused by local batteries due to contact between dissimilar metals. Therefore, the caulking nut 23 is a small part.
If an insulating film is formed on the surface by olive chromate treatment or the like, electrolytic corrosion between the aluminum center reinforcement 15 and the caulking nut 23 can be prevented, and there is no possibility of such electrolytic corrosion occurring. Therefore, the cost for antirust measures is only the cost required to treat the slightly small caulking nut 23 with olive chromate, and the cost for antirust measures can be kept to a minimum. Therefore, by minimizing the cost of the rust prevention measures and reducing the material cost by suppressing the usage rate of aluminum material mentioned above, bumper reinforcement 1 using aluminum material is possible.
A weight reduction of 4 can be achieved without significantly increasing manufacturing costs. A bumper reinforcement 1 is made up of a center reinforcement 15 made of aluminum and a corner member 16 made of resin.
4 is attached to the vehicle body 11, when a frontal collision load F2 that has a large effect on the vehicle body 11 is input as shown in FIG. ₃ at the time of a frontal collision, the frontal collision load _F2 is The vehicle body 11 is supported by the rigidity of the center reinforcement 15, and shock is absorbed by the shock absorber 12.
Damage to is mitigated. Furthermore, when a corner collision load F ₁ that has little effect on the vehicle body is input to the end of the bumper reinforcement 14 during a turn, etc., the corner member 16 made of resin deforms elastically or plastically. As a result, the impact is absorbed and the original function of the bumper reinforcement 14 can be sufficiently ensured.

In the above embodiment, the caulking nut 2
3. The bolts 25 and washers 40 are made of iron, but if each of these members is made of aluminum, an insulating coating can be formed on the bolts 25 and washers 40 that come into contact with the iron fixing plate 13. Similarly, there will be no electrolytic corrosion.

Effects of the invention As explained above, the present invention has a bumper reinforcement that is composed of an aluminum center reinforcement and a resin corner member. In addition to achieving a significant weight reduction, the usage rate of aluminum material for the entire bumper reinforcement can be suppressed, and material costs can be reduced. Also, since the end of the resin corner member is inserted between the aluminum center reinforcement and the iron support member, electrolytic corrosion due to local batteries between the center reinforcement and the support member is avoided. , there is no need to form an insulating film on the contact surfaces of both members. Therefore, the possibility of electrolytic corrosion remains only at the contact area between the fastening member and the center reinforcement and supporting member connected by the fastening member, and this is a small part. By forming an insulating coating on the fastening member, the cost for rust prevention measures can be kept to a minimum. Therefore, it is possible to reduce the weight of the bumper reinforcement by using aluminum material without reducing the cost of anti-corrosion measures and the cost of materials and increasing the manufacturing cost. Furthermore, since the center reinforcement bridged between the support members on both the left and right sides of the vehicle body is made of highly rigid aluminum, it goes without saying that the original function as a bumper reinforcement can be sufficiently ensured.

Furthermore, since the corner members are made of resin, the curvature at both ends of the bumper reinforcement can be changed more significantly than at the center, making it possible to respond flexibly to design requirements.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention Fig. 4-
A line sectional view, Figure 2 is an exploded perspective view of the same embodiment, and Figure 3 is an exploded perspective view of the same embodiment.
The figure is a plan view showing the arrangement relationship between the bumper reinforcement and the vehicle body of the same embodiment, FIG. 4 is a perspective view showing the coupling structure of the center reinforcement, corner members, and shock absorber of the same embodiment, and FIG. The figure is a perspective view showing a conventional structure, FIG. 6 is a sectional view taken along the line of FIG. 5, and FIG. 7 is a sectional view showing the joining side of the iron bumper stay and aluminum bumper reinforcement. 11...Vehicle body, 12...Shock absorber (supporting member), 14...Bumper reinforcement, 1
5... Center reinforcement, 16... Corner member, 23... Caulking nut (fastening member), 25...
...Bolt (fastening member), 39...Olive chromate coating.

Claims (1)

[Scope of utility model registration request] An aluminum center reinforcement, which constitutes the center portion of the bumper reinforcement, is connected to iron support members disposed on both left and right sides of the vehicle body via fastening members, and the center reinforcements are connected to both ends of the center reinforcement. , characterized in that resin corner members constituting both end portions of the bumper reinforcement are consecutively provided, and one end of the corner member is inserted between the center reinforcement and the support member. Bumper reinforcement structure.