JPH063722Y2 - Bumper structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bumper structure to be mounted on the front and rear of a vehicle body of, for example, an automobile, and in particular, a bumper cover configured to cover the surface of urethane foam that absorbs impact. It is about structure.

[Conventional technology]

BACKGROUND ART Conventionally, in a bumper structure that is attached to the front and rear of a vehicle body of an automobile or the like, there is a bumper structure that absorbs impact (external force) by the bumper and prevents damage to the vehicle body at the time of a collision at a relatively low speed, As an example of such a bumper structure, as shown in FIG. 2, in order to absorb an impact (external force), the surface of a urethane foam 10 made of a resin material such as urethane is made of a resin material. The bumper cover 20 having a U-shape or a C-shape covers the bumper cover 20. The bumper cover 20 has a bumper hose 60 having a rectangular closed cross-section for reinforcing the bumper and mounting it on the vehicle body. Are combined.

Further, since the bumper cover 20 covering the surface of the urethane foam 10 is formed to have a relatively thin thickness and is flexible, the bumper cover 20 is disposed so as to be in close contact with the urethane foam 10 (surface). The urethane foam 10 is configured to hold substantially the entire bumper cover 20.

In the bumper structure configured as described above, when the bumper is increased in size to improve the shock absorbing function, the urethane foam 10 and the bumper cover 20 are also increased in size. That is, the urethane foam 10 is also increased in size in order to hold the increased size bumper cover 20. However, if sufficient strength can be ensured in such a large bumper, the bumper hose 60 as shown in FIG. 2 can be used without increasing the size of the bumper hose 60. It may be downsized. And in this way urethane foam 10
When the bumper cover 20 is enlarged and the bumper hose 60 is downsized, the bumper hose 6
0 is arranged to be connected to the lower side of the bumper, and the lower edge 220 of the bumper cover 20 covering the urethane foam 10 (front surface) is fixed to the bumper hose 60 with a fastening member or the like. However, since the bumper hose 60 is not disposed near the upper edge 230 of the bumper cover 20 and cannot be fixed to the bumper hose 60, a bracket is provided on the upper part of the bumper hose 60. 70 is attached, and the upper edge 230 of the bumper cover 20 is fixed to the bracket 70 with a fastening member or the like (80b).

When a normal shock (external force) W is applied to the bumper, the shock (external force) W is transmitted to the bumper lining hose 60 while being absorbed by the main body portion 30 of the urethane foam 10, and also to the bumper. When the impact (external force) W is applied, particularly when the impact (external force) W is directly applied near the upper portion 210 of the bumper cover 20, the upper portion 2 of the bumper cover 20 in the urethane foam 10 is affected.
Since an impact (external force) W is applied to the bracket 70 via a portion (hereinafter referred to as a holding portion 40) that is in close contact with the bumper cover 20 in order to hold the bracket 10 (near the upper end edge 230), the bracket 70 May be deformed. Therefore, in order to prevent such a problem, conventionally, as shown in FIG. 2, of the bracket 70 in the holding portion 40 of the urethane foam 10 (the portion for holding the upper portion 210 of the bumper cover 20). A so-called hollow portion 90 is formed by partially (partially) removing the vicinity portion, that is, a portion (area) where the holding portion 40 of the urethane foam 10 and the bracket 70 come close (or abut).
The impact (external force) W applied to (transmitted to) the bracket 70 via the holding portion 40 of the urethane foam 10 is mitigated even when the impact (external force) W is applied. Is configured to.

As a prior art showing a bumper structure having such a structure, there is, for example, Japanese Utility Model Laid-Open No. 57-204247 (Japanese Utility Model Application No. 56-92864).

[Problems to be solved by the invention]

However, in the case of the bumper structure shown in FIG. 2, the impact (external force) W applied to the bumper (particularly in the vicinity of the upper portion 210 of the bumper cover 20) is applied to (transmitted to) the bracket 70 via the holding portion 40 of the urethane foam 10. In order to alleviate the above problem, the holding portion 40 of the urethane foam 10 is partially (partially) removed to form the hollow portion 90. Since it is not possible to completely prevent the impact (external force) W from being applied (transmitted) to the bracket 70, in order to reliably prevent such deformation of the bracket 70 due to the impact (external force) W, the bracket 70 It is necessary to secure the strength of the bracket 70 (that is, increase the rigidity to increase the strength of the bracket 70 itself), and for example, to increase the plate thickness of the bracket 70. Although more compatible, in this configuration, an weight and cost of the bracket 70 is increased, and the weight of the entire bumper is also one in which increased.

Therefore, an object of the present invention is to prevent deformation of the bracket while increasing the weight and cost of the bracket for fixing the upper edge of the bumper cover and preventing the impact (external force) from being applied (transmitted). , The urethane foam holding part should ensure sufficient holding performance of the upper part of the bumper cover.

[Means for solving problems]

Therefore, the present invention solves the above-mentioned problems through a bridge part (a bridge part is used to connect a holding part for holding the upper part of the bumper cover above the shock absorbing main part made of urethane foam). The solution is to form a single unit.

More specifically, the reference numeral of FIG. 1 will be used for explanation. In a bumper structure in which the outer side of a urethane foam molded body that absorbs impact is covered with a flexible bumper cover, the urethane foam molded body is provided on the vehicle body side. The main part that is attached to the anti-body side of the bumper reinforcement and extends in the vehicle width direction and absorbs the impact of a collision, and is parallel to the upper surface of the main part at a certain height above this main part. And a rib-shaped bridge portion that joins the lower surface of the holding portion and the upper surface of the main body portion to each other. One side and upper and lower surfaces of the urethane foam molded body are fixed to the lower end of the bumper cover at the lower end side of the bumper cover, and the upper end side thereof is connected to the upper part of the bumper reinforcement. The cover is fixed and covered with a seat, and the holding portion is arranged so that a space is formed between the front bumper cover and the rear bracket. Is.

[Action]

According to the above-mentioned means, the holding portion 4 formed above the urethane foam 1 for holding the upper portion 21 of the bumper cover 2 has the rib-shaped bridge portion 5 (first bridge portion 51 and second bridge portion 52). Main body 3 for absorbing shock through
The urethane foam 1 (holding portion 4) and the like are disposed in the vicinity of the bracket 7 for fixing the upper end edge 23 of the bumper cover 2 by this configuration. Since the hollow portion 9 can be formed, the impact (external force) W is applied to the upper portion 2 of the bumper cover 2.
Even when directly applied to the holding portion 4 of the urethane foam 1 via 1, the impact (external force) W is absorbed from the holding portion 4 through the bridge portions 5 (51, 52) in the main body portion 3. Transmitted to bumper hose 6 and bracket 7
Can be prevented from being transmitted (transmitted) to the bracket 7, and the deformation of the bracket 7 can be reliably prevented. Therefore, in order to secure the strength of the bracket 7, it is possible to increase the plate thickness of the bracket 7. It is not necessary to reduce the weight and cost of the bracket 7, and the main body 3 to the bridge 5 of the urethane foam 1 can be reduced.
The upper portion 21 of the bumper cover 2 can be surely held by the holding portion 4 which is continuously formed by (51, 52), that is, the holding performance of the upper portion 21 of the bumper cover 2 by the holding portion 4 can be improved. You can secure enough.

Further, since the holding portion 4 is connected to the main body portion 3 by the bridge portion 4, even if the holding portion 4 is deformed by an external force and moves, even if the external force is removed, the elasticity of the bridge portion 5 and the holding portion 4 is reduced. The force quickly restores the original position and the original shape of the holding portion 4, and the shape of the bumper cover 2 is maintained in the initial shape.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

The drawing of FIG. 1 shows an embodiment of the present invention. The surface of a urethane foam 1 for absorbing an impact (external force) applied to a bumper is covered with a bumper cover 2, and most of the bumper cover 2 is the above-mentioned. It is designed to be held by urethane foam 1. In addition, a bumper hose 6 for bumper strength and attachment to the vehicle body is disposed on the lower side of the bumper (inner side of the vehicle), and the lower edge 22 of the bumper cover 2 is provided. Is fixed to the bumper hose 6 (8a), and the upper edge 23 of the bumper cover 2 is fixed to the bracket 7 attached to the upper part of the bumper hose 6 (8a).
b) is configured.

In the bumper structure configured as described above, as shown in FIG. 1, the urethane foam 1 covered by the bumper cover 2 is provided with a main body portion 3 for absorbing an impact (external force) W.
And a lateral portion that extends in the vehicle width direction along the bumper cover 2 so as to hold the upper portion 21 (near the upper edge 23) of the bumper cover 2 above the main body portion 3 and has a predetermined thickness. It is formed so as to be clearly separated from the rib-shaped holding portion 4 (that is, the function sharing is clear), that is, the urethane foam 1 forms the main body portion 3 and the holding portion 4, and the main body portion 3 and the holding portion 4 are formed. And (b) are continuous along the holding portion 4 in the vehicle width direction (51), and are provided at predetermined intervals in the vehicle width direction (52) and have a rib-like bridge having a predetermined thickness. The portion 5 (this bridge portion 5 also serves as a support for the holding portion 4) is connected. Further, the main body portion 3, the holding portion 4 and the bridge portion 5 connecting the two portions 3, 4 are integrally formed, that is, the urethane foam 1 is composed of the main body portion 3, the holding portion 4 and the bridge portion 5. Moreover, these parts 3, 4, and 5 are formed by integral molding when the urethane foam 1 is molded. By forming the urethane foam 1 in this way (the holding portion 4 above the main body portion 3 is integrally formed via the bridge portion 5), the vehicle front-rear direction of the bridge portion 5 and particularly the bumper cover 2 Urethane foam 1 is provided near the bracket 7 for fixing the upper edge 23.
(Holding part 4) and the like are not provided, the urethane foam 1 (holding part 4) and the bracket 7 are not in close proximity (or contact), and a hollow part 9 (9) is provided in this part. It will be formed.

Here, the bridge portion 5 integrally formed with both the main body portion 3 and the holding portion 4 of the urethane foam 1 is formed at the substantially central portion of the holding portion 4 in the vehicle front-rear direction. A first bridge portion 51 extending continuously in the vehicle width direction along the holding portion 4 and about 2
A plurality of second bridge portions 52 that extend in the vehicle front-rear direction (that is, a direction orthogonal to the first bridge portion 51) are provided at a predetermined interval (pitch) of about 00 mm, and each of these bridge portions is formed. The bridge portion 5 composed of 51 and 52 is formed in a so-called rib shape (so-called vertical rib shape) having a predetermined thickness (thickness), that is, the first bridge portion 51 is as shown in the drawing. The second bridge portion 52 is formed to have a predetermined thickness (thickness) in the vehicle front-rear direction, and the second bridge portion 52 has a predetermined thickness (thickness) in the vehicle width direction. 51, 5
2 (bridge portion 5) is integrally formed with the main body portion 3 and the holding portion 4.

When a normal impact (external force) W is applied to the bumper, this impact (external force) W is transmitted to the bumper hose 6 while being absorbed by the main body 3 of the urethane foam 1. When the impact (external force) W is directly applied to the holding portion 4 of the urethane foam 1 via the upper portion 21 of the bumper cover 2 in addition to the main body portion 3, the holding is performed. The upper end edge of the bumper cover 2 is formed by the hollow portion 9 (9) formed by the bridge portion 5 (first bridge portion 51 and second bridge portion 52) integrally formed so as to connect the portion 4 and the main body portion 3 together. 23. Since the holding part 4 (urethane foam 1) and the like are not arranged near the bracket 7 for fixing 23, the impact (external force) W applied to the holding part 4 is applied to the bracket 7 via the holding part 4. Join (transmitted) In particular, in this embodiment (configuration shown in the figure), the holding portion 4 is integrally formed with the main body portion 3 via the bridge portion 5 (51, 52). By
The impact (external force) W directly applied to the holding portion 4 is not applied (transmitted) to the bracket 7 from the holding portion 4, and all the impact (external force) W is applied to the holding portion 4.
Through the bridge portion 5 (51, 52) to the shock absorbing main body portion 3 (transmitted), and while being absorbed by the main body portion 3 and disposed and fixed to the vehicle inner side of the main body portion 3. It can be transmitted to the bumper line hose 6.

Therefore, it is possible to reliably prevent the impact (external force) W from being applied (transmitted) to the bracket 7, and thus it is possible to reliably prevent the deformation of the bracket 7 due to the impact (external force) W. Moreover, since the bracket 7 can be surely prevented from being deformed by such a configuration (that is, the impact W that deforms the bracket 7 is not transmitted at all), the strength of the bracket 7 is sufficiently secured. There is no need to (increase the rigidity), that is, it is not necessary to increase the plate thickness of the bracket 7 in order to secure the strength of the bracket 7, and the weight and cost of the bracket 7 can be significantly reduced. Moreover, the weight of the bumper as a whole can be reduced thereby.

Further, the holding portion 4 for holding the upper portion 21 of the bumper cover 2 is continuously supported by the bridge portion 5 (51, 52) integrally formed with the main body portion 3 (supported). Therefore, the upper portion 21 of the bumper cover 2 can be securely held by the holding portion 4, that is, the holding performance of the upper portion 21 of the bumper cover 2 by the holding portion 4 which is the original function of the holding portion 4. Is not impaired at all, and this retention performance can be sufficiently ensured.

Further, as shown in FIG. 1, the holding portion 4 of the urethane foam 1 is located above the bumper cover 2.
1 is only formed in a so-called lateral rib shape having a predetermined thickness, and is integrally formed with the main body portion 3 so as to be joined by the bridge portions 5 (51, 52), and the bridge portion 5 (51 , 52), the bridge portion 5 (5
1, 52), the hollow portion 9 (9) is formed in the vehicle front-rear direction and the urethane foam 1 (holding portion 4) is not disposed. Therefore, the main body portion 3, the holding portion 4, and the bridge portion 5 are formed.
The amount of the urethane foam 1 itself used for integrally forming (51, 52) can be reduced, and the cost can be reduced.
Since the weight of the bumper can be reduced, the weight and cost of the bumper as a whole can be significantly reduced in combination with the weight reduction of the bracket 7 described above.
It should be noted that such a bumper structure can be applied to a bumper attached to either the front or the rear of the vehicle body.

[Effect of device]

In this invention, as described above, the urethane foam is formed into the main body for shock absorption and the holding portion for holding the upper portion of the bumper cover above the main body, and these both portions are connected via the bridge portion. Te (try to connect at the bridge)
Even when a urethane foam holding part is directly impacted (external force), this impact (external force) is transmitted from the holding part to the bumper hose through the bridge part while being absorbed by the main part. By doing so, it is possible to reliably prevent impact (external force) from being applied (transmitted) to the bracket for fixing the upper end edge of the bumper cover, and therefore it is possible to reliably prevent deformation of this bracket. Moreover, since it is not necessary to increase the thickness of the bracket plate in order to secure the strength of the bracket, the weight and cost of the bracket can be significantly reduced, and the weight of the entire bumper can be significantly reduced. It can be reduced.

Further, since the holding portion is integrally formed so as to be joined to the main body portion by the bridge portion and is firmly supported by the bridge portion, the upper portion of the bumper cover can be reliably held by the holding portion, that is, It is possible to sufficiently secure the holding performance of the upper portion of the bumper cover by the holding portion and enhance the resilience of the holding portion.

Furthermore, since the main body portion and the holding portion are integrally formed so as to be joined by the bridge portion, and the hollow portion can be formed by this bridge portion, the amount of urethane foam used to form these portions can be reduced, and the weight and The cost etc. can be reduced significantly.

[Brief description of drawings]

1 is a longitudinal sectional view of a bumper showing an embodiment of the present invention, and FIG. 2 is a sectional view corresponding to FIG. 1 showing a conventional example. 1 ... Urethane foam 2 ... Bumper cover 21 ... Upper part 3 ... Main part 4 ... Holding part 5 ... Bridge part 7 ... Bracket

Claims (1)

[Scope of utility model registration request] 1. A bumper structure in which the outside of a urethane foam molded body that absorbs impact is covered with a flexible bumper cover, wherein the urethane foam molded body is on the side opposite to the vehicle body of the bumper reinforcement attached to the vehicle body. The bumper cover is mounted on the bumper cover and extends in the vehicle width direction to absorb a shock at the time of a collision. The bumper cover is formed in a plate shape substantially parallel to the upper surface of the main body at a certain height above the main body. The upper and lower surfaces of the urethane foam molded body are integrally formed with a holding portion that supports an upper portion of the urethane foam from below and a rib-shaped bridge portion that joins the lower surface of the holding portion and the upper surface of the main body portion. Fixing the lower end side of the bumper cover to the lower part of the bumper reinforcement and fixing the upper end side to a bracket connected to the upper part of the bumper reinforcement to cover and hold the same. The bumper structure is characterized in that the parts are arranged such that a space is formed between the bumper cover and the bracket that face each other in the front-rear direction of the vehicle body.