JPH03200452A - Bumper reinforce for vehicle - Google Patents

Abstract

PURPOSE:To efficiently absorb shock by forming an internal longitudinal wall bridging over the upper wall and the lower wall between the front wall and the rear wall of a bumper reinforce, and positively deforming the internal longitudinal wall only in case of application of a middle class shock on the front wall. CONSTITUTION:The bumper of a vehicle is constituted out of a thin bumper cover made of resin, low pressure foaming urethane foam inserting into this cover, and a bumper reinforce 20 fixing them to front side members. The bumper reinforce 20 is formed into a nearly rectangular section out of the upper wall 20C and the lower wall 20D having a prescribed width and extending mutually in parallel, and the front wall 20E and the rear wall 20F bridging over these respective extreme ends of the front and rear part of them. In the above-stated construction, an internal longitudinal wall 20G bridging over the upper wall 20C and the lower wall 20D is linearly formed in the vertical direction, between the front wall 20E and the rear wall 20F. Only when a middle class shock is applied on the front wall 20E, the internal longitudinal wall 20G is deformed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to bumper reinforcement for vehicles.

[Conventional technology]

Conventionally, as a bumper reinforcement for vehicles,
No. 7-85346 is disclosed.

As shown in FIG. 11, the bumper reinforcement 50 of this vehicle includes an upper wall 50A and a lower wall 50B that are parallel to each other and have a predetermined width, and a front wall 50C that bridges the front ends of the upper wall 50A and the lower wall 50B. It is composed of a rear vertical wall 50D that bridges the approximate centers of the upper wall 50A and the lower wall 50B, and a middle horizontal wall 50E that bridges the approximate centers of the rear vertical wall 50D and the front wall 50C, and is made of extruded aluminum or the like. It is said to be made of wood.

Therefore, when a low impact (arrow F in FIG. 11) is applied to the front wall 50C, the middle lateral wall 50E prevents the bumper reinforcement 50 from being crushed in the direction of the arrow F in FIG. .

Further, in FIG. 11, reference numeral 52 indicates a bumper cover, and reference numeral 54 indicates a low-pressure urethane foam inserted into the bumper cover 52.

However, in the bumper reinforcement 50 of this vehicle, since the reinforcement by the middle horizontal wall 50E is too strong, the bumper reinforcement 50 does not collapse in the direction of arrow F when a moderate impact is applied to the front wall 50C. Therefore, it is necessary to reinforce the side members on the body side to a bumper reinforcement of 50 or more to prevent deformation of the body, resulting in a significant increase in weight and cost.

Furthermore, in the vehicle bumper reinforcement disclosed in Japanese Utility Model Application Publication No. 63-188254, as shown in FIG. A closed cross-sectional structure is formed by hat-shaped press members 58 and 60, and a plurality of rectangular bulkheads 62 are arranged within this closed cross-sectional structure.

Therefore, when a low impact (arrow M in FIG. 12) is applied to the front wall 58A, the bulkhead 62 prevents the bumper reinforcement 56 from being crushed in the direction of the arrow M in FIG.

Further, in FIG. 12, reference numeral 64 indicates a bumper cover, and reference numeral 66 indicates a low-pressure urethane foam inserted into the bumper cover 64.

However, in the bumper reinforcement 56 of this vehicle, the reinforcement by the bulkhead 62 is too strong, so that the bumper reinforcement 56 does not collapse in the direction of arrow M when a moderate impact is applied to the front wall 58A. Therefore,
Bumper reinforcement 56 for body side side members etc.
The need for additional reinforcement to prevent deformation of the body results in a significant increase in weight and cost.

[Problem to be solved by the invention]

In consideration of the above facts, the present invention has a strength that does not deform when a low impact is applied, actively deforms when a medium impact is applied, and absorbs impact energy by this deformation. The object of the present invention is to provide bumper reinforcement for a vehicle that can reduce the input of collision load to the body side.

[Means to solve the problem]

The present invention provides a bumper for a vehicle having a substantially rectangular cross section, which is integrally formed with an upper wall and a lower wall that are parallel to each other and have a predetermined width, and a front wall and a rear wall that bridge the front and rear ends of these upper and lower walls. The reinforcement is characterized in that it includes a middle vertical wall that is integrally formed between the front wall and the rear wall and bridges the earthen wall and the lower wall.

[Effect]

In the present invention having the above configuration, the middle vertical wall that reinforces the bumper reinforcement against the impact applied to the front wall is integrally formed between the front wall and the rear wall, and bridges the earth wall and the lower wall. . Therefore, when a low impact is applied to the front wall, the bumper reinforcement will hardly deform due to the middle vertical wall. On the other hand, compared to conventional reinforcement structures, this reinforcement using the middle vertical wall is designed to be more easily deformed in response to the impact acting from the front wall toward the rear wall. When an impact is applied, the bumper reinforcement expands vertically and collapses rearward. Therefore, impact energy is absorbed by this deformation, and the input of collision load to the body side can be reduced.

〔Example〕

A first embodiment of a bumper reinforcement for a vehicle according to the present invention will be described with reference to FIGS. 1 to 6.

In the figure, arrow FR indicates the forward direction of the vehicle, arrow IN indicates the inside direction of the vehicle, and arrow UP indicates the upward direction of the vehicle.

As shown in FIG. 2, the bumper 10 of the vehicle is disposed at the lower front end of the front body 12 along the vehicle width direction.

As shown in FIG. 3, this bumper 10 includes a thin bumper cover 14 made of resin, a low-pressure urethane foam 16 inserted into the bumper cover 14, and a front side member 18 that connects the bumper cover 14 and the urethane foam 16. It is composed of a bumper reinforcement 20 that is fixed.

Further, the bumper cover 14 has an upper portion fixed to the body with bolts, and a lower portion fixed to the lower surface of the bumper reinforcement 20 with bolts.

The bumper reinforcement 20 is made of extruded aluminum material, and as shown in Fig. 1, both ends in the vehicle width direction! 2
OA, 20B rear wall 20F (front side member 18
Through holes 22, 24, and 26 for attachment are bored on each side of the triangle so as to correspond to each vertex of the triangle.

The front side members 18 are arranged substantially along the longitudinal direction at the lower portions of both ends of the front body 12 in the vehicle width direction, and as shown in FIG. 20
Through holes 21, 23, 25 are drilled in each case for mounting.

As shown in FIG. 4, bolts 28 are inserted into the through holes 21, 23, 25 of the front side member 18 and the through holes 22, 24, 26 of the bumper reinforcement 20 from the bumper reinforcement 20 side to the front side member 18 side. A weld nut 30 is penetrated through the front side member 18 and welded to the front end 18A of the front side member 18 from the rear side.
are screwed together.

Therefore, the bumper reinforcement 20 is attached to the front end portion 18A of the front side member 18 by these bolts 28.
Fixed.

The cross-sectional shape of the bumper reinforcement 20 when viewed from the longitudinal direction includes an upper wall 20C and a lower wall 20D that are parallel to each other and have a predetermined width, and a front wall 20E and a rear wall that bridge the front and rear ends of the upper wall 20C and the lower wall 20D. 2OF are integrally formed into a substantially rectangular shape. Also, front wall 20E and rear wall 2OF
A middle vertical wall 20G that bridges the upper wall 20C and the lower wall 20D is linearly integrally molded in the vertical direction.

Therefore, when a low impact force (arrow A in FIG. 4) is applied to the front wall 20E of the bumper reinforcement 20, the middle vertical wall 20E
Due to the G, the bumper reinforcement 20 bulges a little in the vertical direction (the state shown by the imaginary line in Fig. 4).On the other hand, a moderate impact is applied to the front wall 20E of the bumper reinforcement 20 (as shown in Fig. 5). When arrow B> is added, the bumper reinforcement 20 is as shown by the solid line in FIG.
It expands greatly in the vertical direction and collapses backwards.

In addition, through holes 34 and 36 for tightening bolts 28 are formed in the front wall 20E and middle vertical wall 20G of the bumper reinforcement 20, respectively.

Next, the operation of this embodiment will be explained.

In this embodiment with the above configuration, when a low impact (arrow A in FIG. 4) is applied to the front wall 20E of the bumper reinforcement 20, the bumper reinforcement 20E is applied by the middle vertical wall 20G.
0 is hardly deformed, and as shown by the imaginary line in FIG. 4, the earthen walls 20C and the lower wall 20D in front and behind the middle vertical wall 20G bulge a little in the vertical direction. That is, it has the strength necessary for low impact.

On the other hand, when a moderate impact (arrow B in Fig. 5) is applied, the reinforcement by the middle vertical wall 20G of the bumper reinforcement 20 has a structure that is more likely to be actively deformed than the conventional reinforcement structure. Therefore, the upper wall 2 in front and behind the middle vertical wall 20G
0C and the lower wall 20D greatly bulge in the vertical direction, and the bumper reinforcement 20 collapses toward the rear (the state shown by the solid line in FIG. 5). Therefore, impact energy is absorbed by this deformation, and the input of collision load to the body side can be reduced.

In the above embodiment, there is one middle vertical wall 20G, but the present invention is not limited to this, and there may be a plurality of middle vertical walls 20G.

Next, the second bumper reinforcement of the vehicle according to the present invention will be described.
An embodiment will be described with reference to FIGS. 7 to 10.

Incidentally, the same members as those in the first embodiment are given the same reference numerals and the explanation thereof will be omitted.

As shown in FIG. 7, a large-diameter through-hole 40 is provided approximately in the center of the through-holes 22, 24, and 26 formed in the rear wall 20F of both ends 2OA and 20B in the vehicle width direction of the bumper reinforcement 20. It is perforated. Also, as shown in Figure 8,
A through hole 42 having the same diameter as the through hole 40 is bored coaxially with the through hole 40 in the middle vertical wall 20G. These through holes 4
A cylindrical energy absorbing member 44 is press-fitted at 0.42 mm. This energy absorbing member 44 is made of extruded aluminum, and its axis is oriented in the longitudinal direction of the vehicle. Further, the rear end 4'4A of the energy absorbing member 44 slightly protrudes from the rear wall 2OF toward the front side member 18, and the front end 44B of the energy absorbing member 44 extends from the front wall 20E.
and the middle vertical wall 20G.

Note that the rear end 44A of the energy absorbing member 44 is connected to the rear wall 2OF.
It may be welded to.

As shown in FIG. 10, each front side member 18
(7) The front end i18A is provided with through holes 46, 23, 25 for attaching the bumper reinforcement 20, and the area surrounded by the through holes 46, 23, 25 is located opposite to the bumper reinforcement 20. A recess 19 protruding to the side is recessed.

As shown in FIG. 8, bolts 28 are passed through the through holes 46 of the front side member 18 and the through holes 22 of the bumper reinforcement 20, respectively, from the bumper reinforcement 20 side to the front side member 18 side.
It is screwed into a weld nut 30 welded to the front end 18A of the front side member 18 from the rear side.

Therefore, when a low impact (arrow A in FIG. 8) is applied to the front wall 20E of the bumper reinforcement 20, the middle vertical wall 20E
Due to G, the bumper reinforcement 20 bulges a little in the vertical direction (as indicated by the imaginary line in FIG. 8). On the other hand, when a moderate impact (arrow B in FIG. 9) is applied to the front wall 20E of the bumper reinforcement 20, the bumper reinforcement 20 will move as shown by the solid line in FIG.
As it expands greatly in the vertical direction and collapses toward the rear, the Enel 1Ils material 44 collapses onto the front wall 2 of the bumper reinforcement 20.
It is compressed and crushed between 0E and the recess 19 of the front side member 18.

Next, the operation of this embodiment will be explained.

In this embodiment with the above configuration, when a low impact (arrow A in FIG. 8) is applied to the front wall 20E of the bumper reinforcement 20, the middle vertical wall 20G causes the bumper reinforcement 20 to
0 is hardly deformed, and the front and rear upper walls 20C and lower walls 20D of the middle vertical wall 20G bulge out a little in the vertical direction, as shown by the imaginary lines in FIG. That is, it has the strength necessary for low impact.

On the other hand, when a moderate impact (arrow B in Fig. 9) is applied, the reinforcement by the middle vertical wall 20G of the bumper reinforcement 20 has a structure that is more likely to be actively deformed than the conventional reinforcement structure. Because it has been done, lol! The front and rear upper walls 20C and lower walls 20D of the wall 20G bulge out in the vertical direction, and the bumper reinforcement 20 collapses toward the rear, and the energy absorbing member 44 pushes against the front wall 2 of the bumper reinforcement 20.
It is compressed and immersed between 0E and the recess 19 of the front side member 18 (the state shown by the solid line in FIG. 9). Therefore, the impact energy is absorbed by the deformation of both the bumper reinforcement 20 and the energy absorbing member 44, and it is possible to reduce the impact load input to the body side.

In the above embodiment, the number of energy absorbing members 44 is two, but the present invention is not limited to this, and a plurality of energy absorbing members 44 may be used.

〔Effect of the invention〕

Since the present invention has the above structure, it has a strength that does not deform when a low impact is applied, it deforms actively when a medium impact is applied, and this deformation absorbs the impact energy. This has the excellent effect of reducing the input of collision load to the body side.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a bumper reinforcement for a vehicle according to a first embodiment of the present invention, viewed diagonally from the rear of the vehicle, and FIG. 2 is a diagram of a vehicle to which the bumper reinforcement for a vehicle according to a first embodiment of the present invention is applied. FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2, FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3, and FIG. FIG. 6 is a sectional view corresponding to FIG. 4 showing a state in which the bumper reinforcement is deformed, and FIG. 6 is a sectional view showing the front side member of the vehicle to which the bumper reinforcement of the vehicle according to the first embodiment of the present invention is applied, as viewed diagonally from the front of the vehicle. FIG. 7 is a perspective view of a vehicle bumper reinforcement according to a second embodiment of the present invention as seen diagonally from the rear of the vehicle, FIG. 8 is a sectional view taken along the line ■-■ in FIG. A sectional view corresponding to FIG. 8 showing a deformed state of the bumper reinforcement of a vehicle according to the second embodiment of the invention, and FIG. 10 is a cross-sectional view of a vehicle to which the bumper reinforcement of the vehicle according to the second embodiment of the invention is applied. A perspective view of the front side member seen diagonally from the front of the vehicle, No. 111!
I is a cross-sectional view showing the bumper reinforcement of a conventional vehicle, and FIG. 12 is a cross-sectional view showing the bumper reinforcement of another conventional vehicle. 20...Bumper reinforcement, 20C...Earth wall, 20D...Lower wall, 20E...Front wall, 20F...Rear wall, 20G...Middle vertical wall.

Claims (1)

[Claims] (1) Bumper reinforcement for a vehicle with a substantially rectangular cross section in which an upper wall and a lower wall that are parallel to each other with a predetermined width and a front wall and a rear wall that bridge the front and rear ends of these upper and lower walls are integrally formed. A bumper reinforcement for a vehicle, comprising a middle vertical wall that is integrally formed between the front wall and the rear wall and bridges the upper wall and the lower wall.