JP2004217018A - Resin bumper for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve stiffness in a horizontal direction and to avoid the occurrence of sink marks on a bumper body in a resin bumper for automobiles. <P>SOLUTION: A rib 23 for welding projecting toward a stiffner 30 made of steel plate is formed on a rear face 21a of a side 21 in a bumper body 20 made of resin, a welding hole 31, where the rib 23 for welding is inserted, is formed at the stiffner, the bumper body 20 and the stiffner 30 are stuck by the welding of the rib 23 for welding that is inserted into a welding hole 31, and the stiffner 30 and a reinforcing member 40 made of steel plate as well as a back bar 60 projecting from the reinforcing member 40 and the body to the front are connected by bolts 53, 55 having an axis in the front and rear directions of a body, respectively. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automotive resin bumper, and more particularly, to an automotive resin bumper particularly suitable for a so-called frame-structured vehicle in which a cabin (body) and a chassis frame are separated from each other.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a bumper for an automobile, a resin bumper that can be easily formed into a relatively simple and complicated shape has been known.
[0003]
This resin bumper is mainly used in automobiles such as passenger cars having a monocoque structure (a structure in which a chassis frame and a cabin are integrally formed).
[0004]
In a monocoque car, the body can support not only the front part of the bumper but also both sides, so even if a load is applied to the side of the bumper, the body effectively absorbs the energy of this load. can do.
[0005]
On the other hand, in a so-called frame structure vehicle in which the body and the chassis frame are separated, the bumper is attached to the vehicle body via two back bars extending forward from the chassis frame such as side members, so that the bumper is directly supported by the vehicle body. When a load is input to the side portion that is not performed, it is necessary for the bumper itself to absorb some energy.
[0006]
The bumper itself absorbs energy, and the resin bumper body, a pair of steel plate stiffeners respectively attached to the back surfaces of both sides of the resin bumper body, and a resin bumper body extending in the longitudinal direction. An automobile in which both ends are provided with a steel plate reinforcing member connected to each steel plate stiffener by a vertical shaft, and each stiffener is rotatably about a vertical axis and is supported by a back bar protruding forward from the frame to the front of the vehicle body. A resin bumper for use has been proposed (Patent Document 1).
[0007]
According to this technology, the load input to the side of the resin bumper main body is input to the steel plate stiffener via the bumper main body, and the steel plate stiffener is rotated around the support shaft (vertical axis) by the back bar. Thereby, the deformation of the resin bumper main body is promoted, and the energy of the input load can be efficiently absorbed by this deformation.
[0008]
[Patent Document 1]
Japanese Utility Model Publication No. 63-39147 [0009]
[Problems to be solved by the invention]
However, the automotive resin bumper of this technology is rotatable about a vertical axis between the resin bumper body and the stiffener, between the stiffener and the reinforcing member, and between the stiffener and the back bar, respectively. There is a problem that the rigidity in the horizontal direction (the longitudinal direction of the resin bumper body) is lower than the vertical direction (the vertical direction of the vehicle body).
[0010]
Further, a reinforcing rib extending in the vehicle width direction is formed on the resin bumper body, and a stiffener is attached to the reinforcing rib. The reinforcing rib is inserted into a fastening member such as a bolt / nut or the like to fasten to the stiffener. It is relatively thick and large to secure
[0011]
For this reason, concave surface sinks due to the formed ribs are likely to occur on the surface (side surface) of the resin bumper, and it is necessary to take measures to prevent the occurrence of the sink marks, which hinders the free design of the bumper. It has become.
[0012]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin bumper for automobiles that can improve rigidity in a horizontal direction and suppress generation of sink marks on a bumper surface.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the resin bumper for automobiles according to the present invention is characterized in that the steel plate stiffener is fixed to the resin bumper body by a welding rib formed on the resin bumper body, so that the steel plate stiffener has a vertical axis. In addition to preventing rotation about the periphery, the occurrence of sink marks is suppressed by a welding rib which is sufficient even if the size and thickness are smaller than the reinforcing rib with the fastening member.
[0014]
That is, the automotive resin bumper according to the present invention is an automotive resin bumper including a resin bumper main body and a steel plate reinforcing member attached to the back side of the resin bumper main body and extending in the longitudinal direction. A pair of steel plate stiffeners are attached to the back surfaces of both sides of the resin bumper body, respectively, and are connected to the steel plate reinforcing member. Welding ribs projecting toward the steel plate stiffener are formed, respectively, the steel plate stiffener is formed with a hole through which the welding rib is inserted, and by welding the welding rib inserted through the hole, The resin bumper main body and the steel plate stiffener are fixed, the steel plate stiffener and the steel plate reinforcing member, and the steel plate reinforcing member and Back bar from the body projecting forwardly, characterized in that it is connected by a fastening member each having an axis in the longitudinal direction of the vehicle body.
[0015]
Here, the welding rib is melted in a state of being inserted into the hole formed in the stiffener, deformed so as to have a contour larger than the hole of the stiffener, solidified, and welded to the stiffener, At the time of molding, the function can be ensured even if the reinforcing rib is sufficiently thinner and smaller in size.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of a resin bumper for an automobile according to the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is an exploded perspective view showing an automobile resin bumper according to an embodiment of the present invention, FIG. 2 is a perspective view showing an assembled state of the automobile resin bumper shown in FIG. 1, and FIG. FIG. 3B is a cross-sectional view showing a cross-section taken along the line BB in FIG. 2, and FIG. 4 is a cross-sectional view showing the cross-section taken along the line BB in FIG. 2, and FIG. It is the schematic by D.
[0018]
The illustrated automotive resin bumper 10 includes a resin bumper body (resin bumper body) 20 and a reinforcing member (a steel plate reinforcing member) attached to the back side of the bumper body 20 and extending in the longitudinal direction of the bumper body 20. ) 40 and a pair of left and right steel plate stiffeners (steel plate stiffeners) 30 attached to the back surfaces 21 a of the left and right side portions 21 of the bumper body 20 and connected to the reinforcing member 40.
[0019]
The bumper body 20 extends in the vehicle width direction (right side of the vehicle body to left side LH of the vehicle body), bends from the front part 22 and both ends of the front part 22 toward the rear part Rr of the vehicle body, and extends in the vehicle width direction. It is made up of short left and right sides 21 facing each other.
[0020]
1 and 2, only the right half cut at the center of the front part 21 in the vehicle width direction is shown, and the left half, not shown, has a substantially symmetrical shape and structure with the right half.
[0021]
Five welding ribs 23 projecting toward the stiffener 30 are formed on the back surface 21 a of the side portion 21 of the bumper body 20.
[0022]
As shown in detail in FIG. 4, each of these welding ribs 23 includes two horizontal ribs (horizontal ribs) 23a, 23a extending in parallel in the horizontal direction, and three vertical ribs (vertical ribs) connecting these horizontal ribs 23a, 23a. Ribs 23b, 23, 23b, and has a ladder shape in the horizontal direction as a whole.
[0023]
As shown in the figure, the welding rib 23 is formed such that the horizontal rib 23a is longer than the vertical rib 23b.
[0024]
A fixing hole 24 for positioning the stiffener 30 is formed below the welding ribs 23 and on the bottom surface of the bumper body 20.
[0025]
On the other hand, in the portion of the stiffener 30 corresponding to each welding rib 23, five welding holes 31 through which these welding ribs 23 are separately inserted are formed.
[0026]
These welding holes 31 are horizontally elongated holes that are long in the horizontal direction so as to adapt to the entire shape of the welding ribs 23.
[0027]
Further, at a portion below the welding holes 31 and corresponding to the fastening holes 24 of the bumper main body 20, a fastening hole 32 overlapping with the fastening holes 24 is formed.
[0028]
The left stiffener (not shown) has the same structure as the right stiffener 30.
[0029]
Further, two weld bolts 53 for connecting a reinforcing member 40 provided corresponding to the front surface portion 22 of the bumper body 20 are welded to the center side of the stiffener 30 in the vehicle width direction.
[0030]
Each of these weld bolts 53 has an axis extending in the vehicle longitudinal direction, and protrudes from the stiffener 30 toward the vehicle rear Rr.
[0031]
At the left and right ends of the reinforcing member 40 connected to the stiffener 30, connection holes 41, 41 through which the weld bolts 53, 53 are inserted are formed.
[0032]
Similarly, a connection hole for connecting to a left stiffener (not shown) is formed in a left portion (not shown) of the reinforcing member 40.
[0033]
Further, an assembly portion 43 connected to a back bar 60 projecting forward from the vehicle body to the front Fr is provided at a portion inside the vehicle width direction from both ends of the reinforcing member 40. A weld nut (not shown) fastened to a bolt 55 inserted from the back bar 60 side is welded.
[0034]
Further, a fastening hole 42 that overlaps with the fastening hole 25 provided in the bumper main body 20 is provided in a bottom surface near both ends of the reinforcing member 40.
[0035]
Next, the operation of the automotive resin bumper 10 of the present embodiment will be described.
[0036]
First, the stiffener 30 is inserted from the back surface 21 a side of the side portion 21 of the bumper main body 20, and each welding rib 23 (indicated by a two-dot chain line in FIG. 3A) of the bumper main body 20 is inserted into each welding hole 31 of the stiffener 30. It is arranged to make it.
[0037]
Next, the stiffener 30 is aligned with the bumper main body 20 such that the fixing hole 32 of the stiffener 30 matches the fixing hole 24 of the bumper main body 20.
[0038]
Then, the clip 51 is fitted into the fastening hole 32 of the stiffener 30 from below the bumper body 20 via the fastening hole 24 of the bumper body 20, and the stiffener 30 is positioned and temporarily held on the bumper body 20.
[0039]
In this temporary holding state, the welding rib 23 protruding from the welding hole 31 is thermally deformed by using a special welding device or other jig, and the thermally deformed welding rib 23 ′ (in FIG. 3A). The stiffener 30 is fixed to the bumper main body 20 by being hooked on the edge of the welding hole 31 (shown by a solid line).
[0040]
Next, the connection holes 41 of the reinforcing member 40 are inserted into the weld bolts 53 provided on the left and right stiffeners 30, and the fastening holes 42 of the reinforcing member 40 are overlapped with the fastening holes 25 of the bumper main body 20, A clip 52 is fitted into the fastening hole 42 of the reinforcing member 40 from below the bumper body 20 via the fastening hole 25 of the bumper body 20, and the reinforcing member 40 is positioned on the stiffener 30 and the bumper body 20 and temporarily held. Is done.
[0041]
After that, the nut 54 is fastened to the weld bolt 53 protruding from each connection hole 41 of the reinforcing member 40, so that the reinforcing member 40 is fixed to the stiffener 30 and the bumper main body 20, and as shown in FIG. It is assembled as a bumper 10.
[0042]
Then, the assembled resin bumper 10 for an automobile is configured such that the bolt 55 inserted from the side of the back bar 60 protruding forward from the vehicle body to the weld nut provided on the mounting portion 43 of the reinforcing member 40. It is fastened and assembled to the vehicle body.
[0043]
Thus, according to the automotive resin bumper 10 according to the present embodiment assembled to the vehicle body, the welding rib 23 formed on the bumper body 20 is inserted through the welding hole 31 formed on the stiffener 30, Since the welding rib 23 is melted and solidified to fix the bumper body 20 and the stiffener 30, the welding rib 23 can be formed thinner and smaller than the conventional reinforcing rib, and the rib is formed. It is possible to suppress sink marks on the surface side of the bumper main body 10 which may be caused by the above.
[0044]
Further, since the bumper body 20 and the stiffener 30 are fixed, the rigidity of the resin bumper 10 for automobiles in the horizontal direction can be improved.
[0045]
Furthermore, since the stiffener 30 and the reinforcing member 40 are fastened by the weld bolt 53 and the nut 54 having an axis in the vehicle longitudinal direction, the stiffener 30 and the reinforcing member 40 are relatively positioned in a plane perpendicular to the vertical axis. The rigidity in the horizontal direction of the resin bumper 10 for an automobile can be further improved without rotating in the horizontal direction.
[0046]
Similarly, since the reinforcing member 40 and the back bar 60 of the vehicle body are fastened by a bolt 55 and a weld nut having an axis in the vehicle front-rear direction, the reinforcing member 40 and the vehicle body are fixed in a plane orthogonal to the vertical axis. Since the back bar 60 does not relatively rotate, the rigidity of the resin bumper 10 for a vehicle in the horizontal direction can be further improved.
[0047]
And since the whole resin bumper 10 for automobiles is integrated, it is easy to assemble even with a frame structure vehicle in which the back bar 60 protrudes from the chassis frame of the vehicle body.
[0048]
When a load from the front body Fr toward the rear Rr is input to the resin bumper 10 for an automobile configured as described above, the reinforcing member 40 and the reinforcing member 40 are connected via the bumper body 20. The energy of the input load can be absorbed by the interposed back bar 60.
[0049]
On the other hand, when a load is input to the side portion 21 of the automotive resin bumper 10, a load is input to the stiffener 30 via the bumper main body 20, and the connecting portion between the stiffener 30 and the reinforcing member 40 is deformed (torsion deformation). Etc.), the energy of the input load can be absorbed.
[0050]
In the resin bumper 10 for an automobile according to the present embodiment, since the welding ribs 23 are formed by the two horizontal ribs 23a and the three vertical ribs 23b connecting these horizontal ribs 23a, a single welding rib is used. The thickness and size of the individual ribs 23a and 23b can be made smaller than those formed by the ribs, and the bumper body can be secured while securing the welding volume of the welding rib 23 as a whole, that is, securing the welding strength. 20 can be further reduced.
[0051]
In the present embodiment, the ladder-shaped welding rib 23 is formed by combining two horizontal ribs 23a and three vertical ribs 23b. However, the resin bumper for an automobile of the present invention is not limited to this form. However, the numbers of the horizontal ribs 23a and the vertical ribs 23b are not limited to this mode, and may be configured to have a cross-girder shape, for example.
[0052]
Further, the resin bumper 10 for an automobile of the present embodiment has a configuration in which the horizontal ribs 23a are formed to be longer than the vertical ribs 23b, and the welding holes 31 are formed as long holes in the horizontal direction. When a load component is also input from the upper part Up of the vehicle body, since the contact area between the lateral rib 23a of the bumper body 20 and the welding hole 31 of the stiffener 30 is large, the load per unit area can be reduced, and welding is performed. Breakage of the ribs 23 can be suppressed.
[0053]
【The invention's effect】
As described above, according to the automotive resin bumper according to the present invention, the welding rib formed on the resin bumper main body is welded in a state where the welding rib is inserted into the hole formed on the steel plate stiffener. Since the bumper main body and the steel plate stiffener are fixed, the welding rib can be formed thinner and smaller in size than the conventional fastening rib, so that the occurrence of sink marks on the surface side of the resin bumper main body is reduced. Can be suppressed.
[0054]
Further, since the resin bumper main body and the steel plate stiffener are fixed, the rigidity of the resin bumper for automobiles in the horizontal direction can be improved.
[0055]
Further, since the steel plate stiffener and the steel plate reinforcement member are connected by a fastening member having an axis in the vehicle longitudinal direction, the steel plate stiffener and the steel plate reinforcement member do not relatively rotate in a plane perpendicular to the vertical axis. Can be further improved in the horizontal direction.
[0056]
Similarly, since the steel plate reinforcing member and the back bar of the vehicle body are connected by a fastening member having an axis in the vehicle body front-rear direction, they do not relatively rotate in a plane perpendicular to the vertical axis, and The rigidity of the resin bumper in the horizontal direction can be further improved.
[0057]
And since it is unified as the whole resin bumper for motor vehicles, it becomes easy to assemble even with a frame structure vehicle where the back bar projects from the chassis frame.
[0058]
When a load directed from the front of the vehicle body to the rear is input to the resin bumper for an automobile configured as described above, the reinforcing member made of steel plate and the reinforcing member made of steel plate are connected via the resin bumper body. The energy of the input load can be absorbed by the interposed back bar.
[0059]
On the other hand, when a load is input to the side of the resin bumper for automobiles, the load is input to the steel plate stiffener via the resin bumper main body, and the connection between the steel plate stiffener and the steel plate reinforcing member is deformed. By doing so, the energy of the input load can be absorbed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a right half of a resin bumper for an automobile according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an assembled state of the automotive resin bumper shown in FIG. 1;
3A is a cross-sectional view showing a cross section taken along line AA in FIG. 2, and FIG. 3B is a cross-sectional view showing a cross section taken along line BB in FIG.
FIG. 4 is a schematic view of the automotive resin bumper shown in FIG.
[Explanation of symbols]
10 Resin bumper for automobiles 20 Bumper body (resin bumper body)
21 Side 21a Back 22 Front 23,23 'Welding rib 23a Horizontal rib 23b Vertical rib 24,25,32,42 Fastening hole 30 Stiffener (steel plate stiffener)
31 welding holes (holes)
40 Reinforcement member (steel plate reinforcement member)
41 Connection hole 43 Assembling part 51, 52 Clip 53 Weld bolt 54 Nut 55 Bolt 60 Back bar Fr Body front Rr Body rear RH Body right LH Body left Up Body upper

Claims (3)

In a resin bumper for automobiles, comprising a resin bumper body and a steel plate reinforcing member attached to the back side of the resin bumper body and extending in the longitudinal direction,
Attached to the back surface of both sides of the resin bumper body, respectively, having a pair of steel plate stiffeners connected to the steel plate reinforcing member,
Welding ribs projecting toward the steel plate stiffener are formed on the back surfaces of both sides of the resin bumper body, respectively.
A hole through which the welding rib is inserted is formed in the steel plate stiffener,
By welding of the welding rib inserted into the hole, the resin bumper body and the steel plate stiffener are fixed,
The resin for automobiles, wherein the steel plate stiffener and the steel plate reinforcing member, and the steel plate reinforcing member and the back bar projecting forward from the vehicle body are connected by a fastening member having an axis in the vehicle body front-rear direction. Bumper. The automotive bumper according to claim 1, wherein the welding rib is formed by at least two horizontal ribs and at least two vertical ribs connecting the horizontal ribs. The automobile according to claim 2, wherein the welding rib is formed such that the horizontal rib is longer than the vertical rib, and the hole is formed as an elongated hole that is longer in the horizontal direction than in the vertical direction. For resin bumper.

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