JPS6135465Y2 - - Google Patents

Description

[Detailed description of the invention] The disclosed technology belongs to a technology for attaching and fixing a retainer of an FRP reinforcement for a bucking member of an elastic bumper installed at the front or rear of a vehicle such as an automobile.

Therefore, this invention is applicable to bumper structures installed on the front and rear of vehicles such as automobiles, in which an FRP is equipped with an elastic bumper body having an elastic outer material such as urethane elastomer and an inner elastic core material such as urethane foam. It relates to a structure in which a reinforcement manufactured by a manufacturer is fixed to a retainer attached to a vehicle body via an adhesive, and in particular,
Ribs are formed on the upper and lower edges of the back surface of the FRP reinforcement so that it can be slid onto the hooks on the upper and lower edges of the mounting surface of the retainer, and adhesive is applied to the gap formed between the back surface and the mounting surface. This invention relates to a vehicle bumper structure in which the bumper is interposed.

As is well known, vehicles such as automobiles are equipped with bumpers on the front and rear for safety measures, etc. Recently, metal bumpers have been replaced with bumpers that are made of elastic material in order to enhance safety and save energy. Bumpers are becoming widely adopted.

Therefore, in this type of elastic bumper, it is necessary to attach it to a retainer that is attached to the vehicle body via a reinforcement as a bucking member, but until now, the reinforcement has generally been made of metal. However, from the viewpoint of improving fuel efficiency and promoting impact energy absorption function, a technology has been devised and adopted to replace the materials made with FRP.

However, in the case of metal reinforcements, mechanical connections such as welding were used to ensure sufficient strength when joining the metal retainer, whereas FRP reinforcements require bolts on the joint surface. There is an embodiment in which a hole or the like is drilled and mechanically fixed with a bolt or the like, but this embodiment has the disadvantage that stress at the time of a collision is concentrated in the vicinity of the bolt hole, resulting in a decrease in fracture strength.

Therefore, as shown in FIG. 1, an elastic bumper body 3 consisting of a urethane elastomer sheathing material 2 attached to a urethane foam core material 1 has been pulled out through the urethane elastomer sheathing material through bolts 4, 4. After mounting on the molded Japanese-shaped FRP reinforcement 5, the mounting surface 7 of the box-shaped retainer 6 by iron plate welding and the back surface 5' of the reinforcement 5 are adhesively bonded using an adhesive 8 such as urethane. Was.

Therefore, it has the disadvantage that the bonding strength is not sufficient and reliability is low compared to mechanical bonding, and when applying the adhesive, it is necessary to use a temporary holder to maintain the adhesive pressure and press it for a predetermined period of time, and installation work is required. This method is extremely complicated, requires post-processing, requires a large number of man-hours, and has the disadvantage of resulting in high costs.

The purpose of this invention was to solve the problem of attaching and fixing the elastic bumper body based on the above conventional technology to a retainer via FRP reinforcement.
By sliding the back side of the manufactured reinforcement sideways to the hook of the retainer and attaching it with adhesive, the above drawbacks are eliminated and the difficulties are solved.
It is an object of the present invention to provide an excellent vehicle bumper structure that can eliminate the disadvantages and take advantage of the advantages of FRP reinforcement.

The structure of this invention in accordance with the above purpose is that after an elastic exterior material with an inner elastic core material is attached to an FRP reinforcement, the back surface of the reinforcement is slid into a hook on the attachment surface of a retainer. Then, adhesive was injected from the retainer side into the gap formed between the mounting surface and the back surface to adhesively fix the retainer so that it could be quickly and reliably assembled in one touch. The gist of this is that

Next, one embodiment of this invention will be described below based on FIGS. 2 and 3. Note that the same parts as in FIG. 1 will be explained using the same reference numerals.

Reference numeral 1 denotes a core material made of urethane foam, and an exterior material 2 made of urethane elastomer and having a U-shaped cross section is attached to the outer surface of the core material 1 to form an elastic bumper body 3.

The elastic bumper main body 3 is attached to a Japanese-shaped FRP reinforcement 5 through bolts 4, 4 at the flange end of the elastic exterior material 2.

It should be noted that the attachment of the elastic exterior material 2 to the reinforcement 5 through bolt holes does not affect the strength reduction of the reinforcement 5 because stress at the time of impact does not concentrate there.

In addition, the FRP reinforcement 5 uses 60 to 80 wt% of glass fiber, carbon fiber, or Gebura fiber as reinforcing fibers mainly in the form of unidirectional roving, and the matrix resin is generally unsaturated polyester or epoxy. , vinyl ester resin, etc., and is pultruded. Although the embodiment is of a straight side type, it is also possible to design a curved type, and the upper and lower edges of the back surface 5' are provided with ribs 9. ', 10 are provided.

On the other hand, reference numeral 6' denotes a pair of retainers, which are attached and fixed to the front and rear of an automobile body (not shown) in a conventional manner, and are formed into a box-shaped cross section by steel plate welding. It has a cavity forming recess 11 which is concave in shape, and an adhesive injection hole 12 and an air vent hole 13 are bored in the recess 11, and the upper and lower sides abut against the back surface 5' of the reinforcement 5. A surface 11' is formed.

Hooks 14 and 15 for holding the ribs 9 and 10 on the back surface 5' of the reinforcement 5 are formed at the upper and lower edges of the mounting surface 7'.

Note that the mounting surface 7' follows the beam shape of the reinforcement 5, and is linear when it is straight and curved when it is curved.

Further, an adhesive injection machine insertion/check hole 16 is bored in the upper surface of the retainer 6'.

17 is a tool insertion hole for attachment to the body, and 18 and 19 are bolt holes for attachment to the body.

In the above structure, the elastic bumper body 3 is made by integrating the core material 1 and the elastic exterior material 2 through an adhesive such as urethane, and the elastic bumper body 3 has the elastic exterior material 2 attached to the bolts 4 and 4.
The reinforcement 5 is attached to the FRP reinforcement 5 through the ribs 9 and 10, and then the hook 1 of the retainer 6'
4 and 15 from the side and engage the inside of the slide, and clamp the pair of retainers 6' and 6' to the beam of the reinforcement 5 in a predetermined position, and connect the back surface 5' and the mounting surface 7'. A gap 18 is formed in between.

Therefore, an adhesive injection machine nozzle (not shown) is inserted through the hole 16 on the upper surface of the retainer 6'.
2, inject an adhesive 8, for example, a structural adhesive such as urethane, epoxy, or acrylic, and remove air from the air vent hole 13 to prevent air bubbles from entering the rear surface 5' and mounting surface 7' of the reinforcement 5. The gap 18 formed between the reinforcement 5 and the retainer 6' is filled with the adhesive 8, and filling completion is confirmed by the overflow of the adhesive 8 from the hole 13. to fix.

The adhesion holding pressure until the adhesive 8 is fixed is ensured by the mechanical engagement of the hooks 14, 15 and the ribs 9, 10.

The elastic bumper fixed in this way is glued with adhesive 8.
Due to the mechanical coupling between the ribs 9, 10 and the hooks 14, 15, no separation occurs in the event of a collision, and a fixed relationship is reliably maintained.

It goes without saying that the embodiments of this invention are not limited to the above embodiments; for example, the ribs may not be formed over the entire length of the reinforcement, but may be formed only on the retainer mounting section, or the ribs may be formed on the back surface and the mounting section. Various embodiments are possible, such as the surface having multiple uneven stripes to widen the bonding surface.

As described above, according to this invention, in an elastic bumper structure installed on the front and rear of a vehicle such as an automobile, the elastic bumper body is attached to an FRP reinforcement, and the upper and lower edges of the back of the reinforcement are By making ribs so that they can be slidably engaged with the hooks on the upper and lower edges of the retainer's mounting surface, and by forming an adhesive-filled gap between the mounting surface and the back surface, the basic The FRP retainer has surface bonding with adhesive and hooks, as well as repeated bonding with mechanical bonding, making it possible to obtain extremely strong fixed reinforcement in practical use. The excellent effect of improving the retention ability of

In addition, the ribs of the reinforcement and the hooks of the retainer slide together during installation, allowing for one-touch installation.Afterwards, the adhesive can be injected into the gap between the back surface and the installation surface, so it is easy to install after the adhesive is injected. Since the pressure contact force is clamped by the hook, there is no need for a temporary fixing jig or the like, and an excellent effect is achieved in that it is reliably maintained.

Therefore, pre- and post-processing can be omitted, the number of man-hours is reduced, and the mounting device can be assembled quickly, which has the advantage of resulting in cost reduction.

Another advantage is that the work order is fixed, no skill is required, and the operation is smooth.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram of a bumper structure based on the prior art, Figs. 2 and 3 are explanatory diagrams of one embodiment of this invention, in which Fig. 2 is a structural cross-sectional explanatory diagram, and Fig. 3 is a partially cutaway perspective view. It is an explanatory diagram. 3... Elastic bumper body, 5... FRP reinforcement, 6'... Retainer, 7'... Mounting surface, 8... Adhesive, 5'... Back, 9, 10...
Rib, 14, 15... hook, 18... void.

Claims (1)

[Scope of utility model registration request] In a vehicle bumper structure in which an FRP reinforcement equipped with an elastic bumper body is fixed to the mounting surface of a vehicle retainer via adhesive,
Ribs are formed on the upper and lower edges of the mounting back surface of the FRP reinforcement, while hooks for engaging the ribs are provided on the upper and lower edges of the mounting surface of the retainer, and an adhesive-interposed gap is formed between the mounting surface and the back surface. A bumper structure for a vehicle, characterized in that the bumper structure is formed so as to be formed.