JPS5984647A - Shock absorbing bumper - Google Patents

Abstract

PURPOSE:To accurately perform assembly between a shock absorbing member and a bumper skin which coats the shock absorbing member, by dividing the shock absorbing member of the captioned bumper into plural blocks along its lengthwise direction and engaging a protruded part to a recessed part, which are provided in each end face of the block, so as to connect each block. CONSTITUTION:The captioned bumper B is constituted of a bumper strength member 11 of cross section in an almost square shape with one end open mounted to a car body and made of metal having rigidity, shock absorbing member 22 arranged in front of the member 11 and made of foaming resin of urethane or the like, and a bumper skin 33 fixed to said member 11 so as to coat this shock absorbing member 22 and consisting of rubber or the like. Here the shock absorbing member 22 is divided into two blocks in almost the central part, and a protruded part 26 and a recessed part 27 fittable to each other are formed in the rear side of opposed faces of each divided block 24, 25. In this way, a dimensional error of the shock absorbing member 22 can be absorbed by sliding the protruded part 26 and the recessed part 27, thus a position relation between the shock absorbing member 22 and the bumper skin 33 is held in a fixed condition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock-absorbing bumper, and more particularly to a shock-absorbing bumper comprising a bumper strength member made of metal or the like and having a shock absorber on the outer surface thereof that absorbs shock energy in the event of a side collision. “.

Conventionally, this type of impact-absorbing bumper will be explained using a front bumper as an example. As shown in FIGS. A bumper strength member 1 formed in a substantially U-shape, a shock absorber 2 disposed on the front side of the member strength member 1 and integrally molded from a foamed resin such as urethane or polypropylene, and a shock absorber 2 covering the shock absorber 2. The bumper skin 3 is fixed to the bumper strength member and is made of resin or rubber and can be deformed following the deformation of the shock absorber 2. In FIGS. 1 and 2, 4 is a stay for attaching the bumper B to the vehicle body, and 5 is a notch recessed along the central longitudinal direction of the front surface of the 9IA absorber 2, It serves as a deformation space for the shock absorber 2 to reduce the initial reaction force of the shock absorbing property, and numerals 6 to 8 refer to bolts, nuts, and hitches for fixing and holding the bumper skin 3 to the bumper strength member 1. It is.

However, in such conventional shock absorbing nokumpa, the shock absorber 2 is integrally molded from foamed resin such as foamed urethane, so the temperature conditions during molding and the amount of foaming agent may vary. Due to the influence of errors, relatively large sink marks and deformation occur after molding, and inevitably the dimensions of the shock absorber 20 tend to become non-uniform, resulting in large dimensional errors in the longitudinal direction of the shock absorber 2 in the rows. It will appear.

Therefore, in conventional shock absorbing bumpers, if the longitudinal dimension of the shock absorber 2 is longer than a predetermined length, for example, both sides of the shock absorber 2 are disposed inside the bumper skin 3. Not only does this impair the ease of assembling the bumper B, but also causes the bumper skin 3 to unnecessarily protrude outward, resulting in poor appearance.
Even if the impact absorber 2 could be stored on the bumper surface or inside the skin 3, the impact absorber 2 would be stored in a compressed state, and the initial reaction force in the event of a side collision would be correspondingly large.
There is also a risk that desired energy absorption characteristics may not be obtained. On the other hand, if the longitudinal dimension of the impact absorber 2 is formed to be shorter than the predetermined value, the clearance between the impact absorber 2 and both sides of the pants (outer skin 30) will be larger than necessary, and In addition to rattling the impact absorber 2, another problem occurs in that the impact energy cannot be effectively absorbed by the impact absorber 2 in the event of a side collision.

The present invention was made in view of the conventional shock absorbing pants, and its purpose is to effectively absorb dimensional errors in the shock absorber and maintain a constant positional relationship between the shock absorber and the bumper skin. To provide a shock-absorbing bumper which maintains the appearance of the bumper well and can sufficiently ensure its function as a bumper.

The gist of the present invention is to divide the shock absorber into a plurality of blocks in the longitudinal direction, and to connect the divided blocks so as to be movable in the longitudinal direction. The shock-absorbing bumper has adjustable longitudinal dimensions.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

In the embodiments shown in FIGS. 3 to 6, a front bumper is shown, and the basic structure of this bumper is a bumper strength member 11 disposed on the front of the vehicle body, and a bumper reinforcement member 11 disposed on the front of the vehicle body. A shock absorber 22 made of foamed resin is disposed on the front surface of the shock absorber 22, and a shock absorber 22 is attached to the upper and lower walls 12, 13 of the bumper strength member 11 so as to cover the shock absorber 22 and follows the deformation of the shock absorber 22. It consists of a deformable bumper skin 33 made of rubber or resin.

In this embodiment, the bumper strength member 11 is a long member made of rigid metal such as high-tensile steel and has a substantially U-shaped cross section, and has rearwardly curved ends at both ends thereof. It is provided with a bending part 14 that extends while moving. A positioning recess 1 is provided at the front corner of the bent portion 14, and includes a surface substantially along the longitudinal direction of the vehicle body and a surface orthogonal to this surface.
5 is formed extending in the vertical direction. It is assumed that the dimension between the positioning recesses 15, 15 is Ll.

The shock absorber 22 is formed to have approximately the same length as the bumper strength member 11 in the longitudinal direction, and is provided with a circular groove on both sides thereof so as to cover the bent portion 14 of the bumper strength member 11. A section 23 is provided. The shock absorber 22 is divided into two approximately at the middle, and the divided block 24
．． A substantially rectangular parallelepiped-shaped convex portion 26 is formed on the rear side of the divided end surface 24a of one of the blocks 24 so as to be flush with the rear surface of the block 24 and protrude in the longitudinal direction.
, 25, the convex portion 2 is provided on the rear side of the split end surface 25a of the other 25.
A recess 27 into which block 6 is slidably engaged is formed facing the rear surface of block 25, and nine blocks 24 and 25 are connected by engagement between protrusion 26 and recess 2γ.

On the other hand, four positioning portions 1 formed at the bent portions 14 of the bumper strength member 11 are provided at the corner portions of the inner side surfaces of the turning portions 23.
A positioning convex portion 28 that fits into the positioning portion 5 is formed in a protruding manner.

In addition, the front center 1 of the blocks 24 and 25 (the turning part 2
A notch recess 29 is provided along the longitudinal direction from 3 to the vicinity of the divided end faces 24a and 25a.

Further, the bumper skin 33 has a U-shaped cross section to cover the shock absorber 22, and is provided with wrap-around portions 34 corresponding to the wrap-around portions 23 of the shock absorber 22 on both sides thereof.

Therefore, in the shock absorbing bumper according to this embodiment, when the shock absorber 22 is disposed on the front surface of the bumper strength member 11, the shock absorber 22 is attached to the bent portion 14 of the bumper strength member 11.
What is necessary is just to push the impact 5 reed absorber 22 toward the bumper strength member 11 side so that the rotation part 23 of No. 2 comes into contact with it. At this time, the convex portion 26 of the block 24 constituting one of the impact bodies 22 is connected to the concave portion 26 of the other block 25.
7, the dimension L2 between the positioning protrusions 28 and 28 of the shock absorber 22 is the same as that of the protrusion 1.
The positioning recess 15°15 of the bumper strength member 11 is variable within this variable dimension by the longitudinal dimension δ of 3.
The dimension between (hereinafter referred to as the standard dimension of the bumper strength member) Ll
be set in advance to include. Then, the bending portion 14 of the bumper strength member 11 is connected to the insertion portion 23 of the shock absorber 22.
When brought into contact with each other, the convex portion 26 moves appropriately within the four parts 2γ, and the positioning convex portion 28 of the shock absorber 22
is the positioning part Z of the bumper strength member 11! , and the shock absorber 22 is positioned relative to the bumper strength member 11.

In this state, even if there is an error in the dimension in the longitudinal direction of each block 24.25, the dimension L2 between the positioning protrusions 28.
0 Matches standard dimension L1 17 Reeds, shock absorber 2
The longitudinal dimension of 2 will be set according to a predetermined rule. To avoid this, if the longitudinal dimensions of the bumper skin 33 are set in advance in accordance with the predetermined dimensions of the price absorber 22, when the shock absorber 22 is removed from the bumper skin 33, the impact absorber 22 can be The clearance between the wrap-around portion 23 of the bumper skin 33 and the wrap-around portion 34 of the bumper skin 33 is kept constant, so that the sides of the bumper skin 33 do not protrude unnecessarily.
Alternatively, the situation in which the impact absorber 22 is bulky is reliably eliminated, and accordingly, the appearance quality of the bumper B is kept good, and the impact energy of the bumper is reliably absorbed in the event of a side collision. Become.

Furthermore, in this embodiment, the rotating part 23 of the shock absorber 22 is positioned at the bent part 14 of the bumper strength member 11 by the positioning convex part 28 and the positioning concave part 15, so that the impact Even if the blocks 24 and 25 constituting the absorber 22 shrink in the longitudinal direction due to aging, the positions of both sides of the shock absorber 22 do not move, and the shrinkage changes are due to the difference between the recesses 27 and the protrusions 26. The longitudinal dimension of the shock absorber 22 is a predetermined dimension! , is retained. Therefore, the clearance between the wrap-around portion 23 of the shock absorber 22 and the wrap-around portion 34 of the bumper skin 33 remains constant, and the appearance quality and function of the bumper B are maintained by the shock absorber 22.
This means that it will not be affected by changes over time.

Note that the positioning of the bumper strength member 11 and the shock absorber 22 is not limited to that shown in the embodiment, but may be positioned between the front surface of the bumper strength member 11 and the rear surface of the shock absorber 22. You can also do this. Further, in the above embodiment, Mi 4q of the bumper strength member 11
Although the longitudinal dimension of the shock absorber 22 is uniquely set in accordance with the dimension L1, the above-mentioned shock absorber 2 is not necessarily limited to this.
2) The longitudinal dimension of the shock absorber 22 may be adjusted as appropriate in accordance with the longitudinal dimension of the bumper skin 33. Furthermore, the shape and formation position of the convex portion 26 are not limited to those shown in the above embodiments, and can of course be selected as appropriate.
In this case, a concave portion 27 is formed in a shape and position corresponding to the convex portion 26.
All you have to do is to form . Furthermore, the division of the shock absorber 220 is not limited to the two divisions shown in the above embodiments, but may be three or more divisions. Further, in the above embodiment, the shock absorber has a wrap-around portion 23, but the wrap-around portion 23 may not be provided in h. Furthermore, although the above embodiments show the present invention applied to a front bumper, it goes without saying that the present invention can be applied to rear bumpers as well.

As explained above, according to the shock absorbing bumper according to the present invention, the shock absorber is divided into a plurality of parts in the pitching direction, and one end surface of each divided block is provided with an impact absorber. A protrusion extending in the pitcher direction of the absorbent body is formed, and four parts are formed on the other end surface to which the =it marking part is slidably engaged, and the convex part is engaged with the concave part to form each 9 part.
Since they are connected to each other, it is possible to effectively absorb dimensional errors in the shock absorber and maintain a constant positional relationship between the shock absorber and the bumper skin.As a result, the appearance of the bumper is maintained well, and It is possible to fully ensure the functionality of the banba toshi sentence.

[Brief explanation of drawings]

Fig. 1 is an exploded view showing an example of a conventional shock-absorbing bumper, Fig. 2 is an installation sectional view corresponding to II-11 in Fig. An exploded view of H71 showing one row of such shock absorbing bumpers, FIG. 4 is IV- in FIG. 3.
The installation sectional view corresponding to the IV line, Figure 5 is v-v in Figure 3.
The line sectional view, FIG. 6, is a sectional view similar to FIG. 5, showing an assembled state. B... Shock absorption bumper 1, 11... Bumper strength member 2.22... Shock absorber 24.25... Block 3.33... Bumper skin 26... Convex portion 27
...Concavity. Patent Applicant Ususan Jidosha Co., Ltd. Agent Benita Ue Tsuchihashi 1

Claims (1)

[Claims] A bumper strength member disposed on the front or rear surface of the vehicle body, a shock absorber disposed on the outer surface of the bumper strength member, and the shock absorber fixed to the bumper strength member so as to cover the shock absorber. In the shock-absorbing bumper, the shock-absorbing body is divided into a plurality of blocks in the longitudinal direction, and one end face of each of the divided blocks is provided with a bumper skin that can follow the deformation of A convex portion extending in the longitudinal direction of the absorbent body is formed, and a concave portion into which the convex portion is slidably engaged is formed on the other end surface, and the convex portion is engaged with the concave portion to mutually connect the blocks. A shock absorbing bumper characterized by connecting.