JPS6224603Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the field of combination technology for reinforcement of elastic bumpers made of urethane or the like that are installed on the front and rear of automobiles, etc.

This invention is based on an elastic bumper that is equipped on the front and rear of a vehicle such as an automobile and is made of an exterior elastic material made of urethane elastomer and an interior flexible material made of urethane foam. This invention relates to a combination structure in which an exterior elastic material is fastened and attached to the reinforcement, and in particular, the reinforcement and the flexible material are engaged in surface contact with the reinforcement to absorb impact energy. A convex portion in the shape of a tapered truncated cone is formed on at least one part of the engagement and joint surface with the convex part, and a recessed part in the shape of a truncated cone that matches and engages with the convex part is formed on the other side. This invention relates to an elastic bumper and reinforcement combination structure that is fitted and locked to prevent slippage.

<Prior art> As is well known, due to stricter safety standards for automobiles and other vehicles, elastic bumpers such as urethane bumpers are being used instead of metal bumpers, which reduce impact energy during vehicle collisions. It is meant to be absorbed.

In the early days, elastic bumpers were relatively small, but in recent years there has been a trend towards larger sizes and so-called soft facias.

That is, as shown in FIG. 1, an interior flexible material 1 made of urethane foam is used as a core material, an exterior elastic material 2 made of urethane elastomer having a predetermined shape is used as a skin material, and the elastic material 2 is fastened to a reinforcement 3. At the same time, the rear surface 4 of the flexible material 1 is fitted and engaged with the front surface 5 of the reinforcement material 3 to attach the elastic bumper 6. However, when the soft fascia is used as described above, there is a structural surplus. There is a problem that it is difficult to form a certain shape, and therefore, the engagement of the rear surface 4 of the flexible material 1 with the front surface 5 of the reinforcement 3 is not fixed, so that in the event of a collision, a relative shift occurs between the two, resulting in an impact The drawback was that the energy absorption function was weakened.

<Problems to be solved by the invention> In addition, since the flexible material 1 is attached to the reinforcement 3 in substantially plane contact, there was a problem that workability such as centering during assembly was poor.

To deal with this, for example,
As shown in the patent publication, a technique has been devised in which a projection is formed on one side of the reinforcement and a flexible material, and a recess is formed on the other, and the two are fitted together. It has a thick tip that widens at the edges, so it has to be pushed in when it engages with the recess, and it is difficult to automatically center it during assembly. Also, when repeated impact loads are applied, stress concentrates on the undergut-shaped neck of the convex part, causing shearing and breaking action, and in some cases, the convex part is cut at the neck part, resulting in reinforcement. On the other hand, there is a disadvantage that the flexible material may be displaced, such as shearing, and its ability to absorb impact energy may be reduced.

In addition, there is also a mode in which a convex part of a flexible material having a rectangular cross section is fitted into a concave part of a reinforcement having a rectangular cross section, as proposed in the earlier patent publication No. 56-103349.
Although it can respond to horizontal and vertical movements, it cannot respond to complex behaviors such as diagonal and turning movements, and therefore, as mentioned above, shearing occurs at the neck of the recess. There is.

The purpose of this invention is to solve the technical problem of the elastic bumper of the vehicle based on the above-mentioned conventional technology. It is an object of the present invention to provide an elastic bumper and reinforcement combination structure that responds to the shock and prevents slippage, has excellent shock absorption performance, good durability, and good workability.

<Means and effects for solving the problems> In order to solve the above-mentioned problems, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claims, is based on the above-mentioned purpose. The material is automatically and smoothly inserted into the reinforcement by fitting the tapered truncated cone-shaped convex part of at least one of the two into the matching truncated cone-shaped concave part of the other, tightly locking the material. The elastic bumper is installed by aligning the center, bringing the surfaces into contact, and fastening the exterior elastic material to the reinforcement, so that the impact energy at the time of a collision is absorbed by the deflection of the exterior elastic material.
The inner flexible material is absorbed in a tapered truncated cone shape on the attachment surface of the reinforcement, and is then absorbed secondarily by the cushioning action of the inner flexible material. By closely engaging the truncated cone-shaped recess with which the neck part fits, there is no shearing or displacement of the neck during movement in all directions; therefore, the neck part Technical measures have been taken to ensure that the impact energy absorption function is performed as designed, without causing any breakage.

<Example> Next, an example of this invention will be described below based on the drawings from FIG. 2 onwards. Furthermore, the first
Components having the same features as those in the drawings will be described using the same reference numerals.

In the embodiments shown in FIGS. 2, 3, and 4, 6' is an elastic bumper that forms the center of the gist of this invention;
It has an exterior elastic material 2 made of urethane elastomer,
It is of a predetermined large size and has a soft fascia, and an interior flexible material 1' as a core material made of urethane foam is attached to the rear surface of the exterior elastic material 2 with a cushion gap 7 formed by an appropriate adhesive. established and integrated.

Reference numeral 3' denotes a predetermined metal reinforcement, which has a rigid plate and a shock-resistant cross-sectional shape, and a part of the attachment surface of the flexible material 1' on the front surface 5' has a reinforcement plate shown in FIGS. 2 and 3. As shown in FIG. 4, a concave portion 8 is formed as a relative unevenness portion in the shape of a truncated cone in which the soft material 1' widens at the tip by appropriate press working, and on the other hand, as shown in FIG. A recess 8 is provided at a position corresponding to the recess 8 in the portion of the rear surface 4' of the flexible member 1' that engages in surface contact with the front surface 5' of the reinforcement 3'.
A convex portion 9 as a relative unevenness portion having a tapered truncated cone shape matching the truncated cone shape is integrally formed on the flexible material 1.

In each of the above configurations, when assembling the elastic bumper 6' to the reinforcement 3', the operator uses the tapered truncated conical convex portion 9 of the flexible material 1' to cut the reinforcement 3'. When the elastic member 2 is fitted into the concave portion 8 having a truncated conical shape, centering and alignment are automatically and smoothly performed, and the elastic member 2 is then fastened to the upper and lower surfaces of the reinforcement 3' via bolts and nuts (not shown). Assembling can be done smoothly.

Therefore, when an unexpected front-rear collision occurs while the vehicle is running or stopped, the exterior elastic material 2 primarily deflects and absorbs the impact energy, and then the interior flexible material 1'
is elastically contracted and secondarily absorbs it, mitigating the impact on the vehicle body, but in this process, due to the impact vibration or impact direction, the contact surface 5 of the reinforcement 3' of the flexible material 1' The pressure component against The tapered truncated conical convex portion 9 of the material 1' connects to the truncated conical concave portion 8 of the reinforcement 3'.
Because they are tightly fitted and locked together, they prevent displacement and misalignment, and because they behave without any deviation from each other, stress is not concentrated on the neck, so there is no breakage due to shearing, and impact energy is absorbed. Performance is maintained.

Therefore, the flexible material 1' is deformed in the stationary position,
Demonstrates impact energy absorption function as designed.

Further, in the embodiment shown in FIG. 5, contrary to the above-mentioned embodiment, the relative unevenness includes a tapered truncated conical convex portion 8' on the front surface 5'' of the reinforcement 3'', and the rear surface 4 of the flexible material 1''. In this embodiment, a truncated cone-shaped recess 9' is formed in the truncated conical part 9' for fitting and locking, but its operation and effect are substantially the same as those of the above-mentioned embodiment.

Next, the embodiment shown in FIG. 6 is a combination of the above-mentioned two embodiments, and a convex portion 8' and a concave portion 8 in the shape of a tapered truncated cone are provided on the front surface 5 of the reinforcement 3. In this embodiment, a truncated cone-shaped recess 9' and a tapered truncated cone-shaped convex part 9 are formed on the rear surface 4 of the flexible material 1 and are engaged and locked. be effective.

It is needless to say that the embodiments of this invention are not limited to the above-mentioned embodiments. It is possible to form an uneven portion, and various forms of the relative unevenness can be adopted, such as a spot shape or an intermittent row shape.

<Effects of the invention> As described above, according to this invention, in a combination structure of a reinforcement and an elastic bumper having an elastic material equipped with a flexible material, which is installed on the front and rear of a vehicle such as an automobile, the reinforcement and the flexible At least one part of the mating and engaging surface with the material has a tapered truncated conical convex part on one or both sides, and a concave part in a truncated conical shape that matches the convex part on the other side. By making the flexible material fit and lock with the reinforcement, the flexible material basically engages with the reinforcement not only in plane contact, but also in three dimensions, making it possible to create a restrained state. Therefore, even if an impact load is applied due to an unexpected collision, the impact energy will not only be absorbed by the exterior elastic material and interior flexible material, but also by the flexible material. This has the excellent effect of preventing displacement not only in the lateral, vertical, and horizontal directions, but also diagonally and in the turning direction, preventing posture displacement in all directions, and demonstrating the impact energy absorption function as designed. be done.

Even if impact loads are repeatedly applied, the truncated cone-shaped convex part is tapered and the truncated cone-shaped concave part is formed to match this, so the convex part There is no stress concentration caused by biting into the neck part, and there is no shearing action even when stress is applied vertically, horizontally, diagonally, or in the turning direction, so that rupture does not occur between the flexible material and the convex part. There is no risk at all, and the excellent effect of preventing the positional shift of the flexible material over time and maintaining the shock absorbing function at all times is achieved.

Furthermore, the relative concave and convex portions have the advantage that the truncated cone-shaped tapered portion enables automatic centering when assembling the elastic bumper reinforcement, which also has the effect of improving the efficiency of the assembly work.

In addition, the uneven portions of the reinforcement and flexible material can be easily removed and molded during each molding process, so manufacturing is easy and there is an advantage that the cost does not increase.

Therefore, even if it is formed into a large elastic bumper and made into a soft fascia, it has the advantage of not having any hindrances in terms of design or structure.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an assembly structure of an elastic bumper to reinforcement based on the prior art, Fig. 2 and the following are explanatory views of embodiments of this invention; 3 is a partial front perspective view of the same reinforcement, FIG. 4 is a partial rear perspective view of the same flexible material, and FIGS. 5 and 6 are sectional views of other embodiments equivalent to FIG. 2. 1', 1'', 1...Flexible material, 2...Elastic material,
6', 6'', 6...Elastic bumper, 3', 3'', 3
...Reinforcement, 4', 4'', 4,
5', 5'', 5... attachment surface, 8, 8', 9, 9'...
...Relative unevenness.

Claims (1)

[Scope of utility model registration request] In a combination structure of an elastic bumper made of an interior flexible material and its exterior elastic material, and a subsequent reinforcement to which the exterior elastic material is attached and to which the flexible material is attached, the reinforcement and the flexible material have a small contact surface. Both have a convex portion in the shape of a tapered truncated cone on one side and a concave portion in the shape of a truncated cone that the convex portion matches and engages on the other side, and the flexible material is applied to the reinforcement through the concave and convex portion. A combination structure of an elastic bumper and a reinforcement, characterized in that the elastic bumper and the reinforcement are engaged in a non-slip manner.