JPS6135464Y2 - - Google Patents

Description

[Detailed description of the invention] The disclosed technology belongs to a technology for attaching elastic bumper bodies installed at the front and rear of a vehicle to a body retainer via FRP reinforcement.

Therefore, this idea connects the rear surface of the reinforcement and the retainer attachment surface of the vehicle body through an FRP reinforcement that is integrally attached with an elastic bumper body made of a urethane elastomer exterior material with a urethane foam core inside. This relates to a vehicle bumper structure that is fixed with an adhesive between the parts, and in particular, the FRP reinforcement is not only attached to the mounting surface with an adhesive, but also has a lower rear edge. This relates to a bumper structure for a vehicle in which the bumper is engaged with and held by the lower hook of the retainer, and the upper edge is fastened and fixed to the retainer by a clamp.

As is well known, bumpers are installed on the front and rear of vehicles such as automobiles, but recently, from the standpoint of strengthening safety measures and improving fuel efficiency, elastic bumpers using urethane-based elastic materials are often installed. It is being adopted.

Most of the reinforcements for elastic bumpers used to be metal molded products, but FRP molded products are increasingly being adopted due to requirements such as weight reduction and shock absorption properties.

That is, as shown in FIG. 1, an elastic bumper main body A whose elastic exterior material 2 is made of urethane elastomer with a core material 1 made of urethane foam inside is attached to an FRP pultruded reinforcement 3 with bolts 4 of the elastic exterior material 2, The reinforcement is attached to the mounting surface 6 of the metal retainer 5, which is assembled and fixed to the vehicle body in a predetermined manner, through an adhesive 7 such as urethane. ment 3
It was fixedly attached by attaching the back surface 3' of the.

FRP for the mounting surface 6 of the retainer 5
The method in which bolt holes or the like are bored in the mounting rear surface 3' of the reinforcement 3 and mechanically fixed with bolts or the like has the disadvantage that stress at the time of a collision is concentrated in the vicinity of the bolt hole and the breaking strength is reduced.

Incidentally, the stress distribution of bolt attachment of the elastic exterior material 2 to the reinforcement 3 is different, and there is no equivalent relationship to the above-mentioned problem.

Therefore, firstly, there is a problem in that the joint strength is not sufficient in terms of reliability compared to the conventional welding of metal retainers and reinforcements. In order to maintain the strength and positioning posture, a specified jig is required to maintain pressure until the fixed state is reached, which is cumbersome, and has the disadvantage that it is not efficient, and the adhesive may peel off due to collisions, etc. There were also drawbacks, such as the risk of

The purpose of this invention was to solve the problem of attaching an elastic bumper body to a vehicle retainer via an FRP reinforcement based on the conventional technology, and basically fix the FRP reinforcement to a retainer using an adhesive. However, it is an object of the present invention to provide an excellent assembly-type vehicle bumper structure that allows positioning, clamping, and simultaneous clamping to be performed with a single touch.

The structure of this invention in accordance with the above purpose is such that the FRP reinforcement to which the elastic bumper body is attached is held by engaging the lower edge of the rear surface with the hook of the retainer, and attaching the retainer via adhesive. and fasten the upper edge of the reinforcement and the retainer with a clamp,
The gist of this invention is to maintain the adhesive pressure and also to have a mechanical clamping and fixing force, so that the fixed state can be achieved with a single touch.

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

Numeral 1 is a core material made of urethane foam and serves as a collision energy absorber, and an exterior material 2 made of urethane elastomer and having a U-shaped cross section is integrally attached thereto to form the elastic bumper body A.

3 is a reinforcement made of drawn FRP in the shape of a Japanese letter.
It is assembled into one piece.

The FRP of the reinforcement contains 60 to 80% by weight of glass fiber, carbon fiber, or
Gebura fibers are mainly molded in the form of unidirectional rovings, and the matrix is generally made of resin such as unsaturated polyester, epoxy, or vinyl ester.

During molding, ribs 8 and 9 are formed to extend from the upper and lower edges of the back surface.

Reference numeral 5' denotes a retainer, which has a closed-section welded structure made of press-formed steel plates, and is assembled and fixed in a predetermined manner to the front and rear of an automobile body (not shown) in a left and right twin configuration, and its front A mounting surface 6, which is bonded to the back surface 3' of the reinforcement 3 through a predetermined adhesive 7 such as urethane, epoxy, or acrylic, has a hook 1 on the lower edge.
0 and is integrally provided with a tapered portion 11 on the back surface of the upper edge.

Reference numeral 12 denotes a clamp, which is attached to the upper part of the mounting surface 6 via a bolt 13, and has tapered surfaces 12 on its front and rear edges that engage and fasten the rib 8 on the upper edge of the reinforcement 3. ', a tapered surface 1 that engages and fastens the tapered part 11 of the retainer 5';
2'' is integrally provided by press molding.

In the above configuration, the elastic sheathing material 2 equipped with the core material 1 is the same as the conventional type, and the bolts 4,
4 to the reinforcement 3.

The adhesive 7 is applied to at least one of the mounting surface 6 of the retainer 5' and the facing surface of the rear surface 3' of the retainer 3, and the rib on the lower edge of the rear surface 3' of the reinforcement 3 is applied. 9 is relatively engaged with and held by the lower edge hook 10 of the mounting surface 6 of the retainer 5',
Immediately, the back surface 3' and the mounting surface 6 are brought into contact with each other, and the clamp 12 is tightened via the bolt 13, and the front and rear tapered surfaces 12', 12'' are connected to the upper edge rib 8 of the reinforcement 3 and the retainer. 5' is tightened and fixed to the tapered part 11 of the retainer 5', thereby forming a pressing force on the adhesive 7 and applying a mechanical fixing force, and after the adhesive 7 is fixed, the elastic bumper is securely fixed to the retainer 5' by crimping. be done.

The energy at the time of collision is absorbed by the core material 1, and a portion is also absorbed by the FRP reinforcement 3. During this time, the reinforcement 3 is clamped and fastened to the hook 10 and the retainer 12, so the retainer 5' fixation is maintained and the adhesive 7
No peeling occurs.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment, and various embodiments are possible, such as the reinforcement and the retainer being joined in a concave-convex manner, or the retainer side of the clamp being engaged with a hole. It is also possible to omit the ribs on the upper and lower edges and engage the holes.

As described above, according to this invention, the FRP reinforcement equipped with the elastic bumper body is attached to the metal retainer with its back surface against the mounting surface via adhesive, and the back surface is attached to the metal retainer. The edge is held by the hook engagement of the retainer, and the upper edge is fastened to the retainer by a clamp, so basically the reinforcement is fixed to the retainer by attaching it with adhesive and mechanically holding the hook and clamp. The contract guarantees doubly; therefore,
The bonding strength is improved, and an excellent effect that is extremely effective in practice is produced.

In addition, when installing, the hook of the retainer is engaged with the back of the reinforcement, and the upper edge of the reinforcement is fastened to the retainer with a clamp, so that the adhesive pressure can be maintained immediately after the reinforcement is attached. There is also the advantage that the work can be carried out efficiently and quickly without the need for the temporary fixing process of holding for a predetermined time using a pressure work jig during the bonding work, or the cumbersome work of disassembling and removing after the process.

Furthermore, since the FRP reinforcement is not fastened and fixed through bolt holes, it is not possible to
It is possible to prevent stress concentration cracking in the event of a collision while taking advantage of the benefits of FRP reinforcement, such as its light weight, while also maintaining its durability benefits.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view of a vehicle bumper structure based on the prior art, Figs. 2 and 3 are explanatory views of one embodiment of this invention, Fig. 2 is an explanatory cross-sectional view of the structure, and Fig. 3 is a partial explanatory view. It is a perspective explanatory view. A... Elastic bumper body, 3... FRP reinforcement, 7... Adhesive, 3'... Back, 6
...Mounting surface, 8...Top edge (rib), 5'...Retainer, 9...Lower edge (rib), 10...Hook, 12
... Clamp.

Claims (1)

[Scope of utility model registration request] In a bumper structure in which an FRP reinforcement to which an elastic bumper body is integrally attached is fixed to a vehicle body attachment retainer via an adhesive, the back side of the FRP reinforcement is attached to the retainer via an adhesive. 1. A vehicle bumper structure fixed to a mounting surface, the lower edge of the back surface being held by a hook of the retainer, and the upper edge thereof being fastened to the retainer via a clamp.