JP2008290677A - Bumper mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bumper mounting structure capable of improving the energy absorbing efficiency and being easily assembled. <P>SOLUTION: A bumper stay 3 is comprised of a stay main portion 31 connected to a bumper reinforcement 4 and a side member mounting member 32 connected to a side member 1. The side member mounting member 32 is provided with an abutting surface 34 capable of getting in contact with the end surface of the side member 1 at the time of crash, a flange 35 getting surface contact with the outside of a vehicle outside side wall 1Sout of the side member 1 extended from the abutting surface 34, and an expansion portion 36 provided between the flange 35 and the abutting surface 34. The flange portion 35 of the side member mounting member 32 is fastened to the vehicle outside side wall 1Sout of the side member 1 via a fastening member 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bumper attachment structure in which a bumper reinforcement is attached to a side member via a bumper stay.

  Conventionally, as a mounting structure of a bumper installed at the front end portion or the rear end portion of a vehicle body, a bumper reinforcement that forms a skeleton of the bumper is attached to an end portion of a side member via a bumper stay (for example, , See Patent Document 1).

  In this Patent Document 1, the bumper stay has a main body portion fixed to the bumper reinforcement and a pair of first vertical flanges, and the side wall is in a state where the first vertical flange is in contact with the inner surface of the end portion of the side member. A mounting base portion that fits into the member, and a hook portion that is integrally provided from the main body portion and that abuts on both outer surfaces of the side member in the vehicle width direction, and the first vertical flange and the hook portion are provided on the side member. The bumper stay is connected to the front end of the side member by sandwiching the side surface portion.

With such a structure, when the offset load is input to the bumper reinforcement and a rotational moment around the vertical axis acts on the bumper stay at the time of a vehicle collision, the side surface portion of the side member is bent and deformed. To improve energy absorption efficiency.
JP-A-11-208392

  However, in such a conventional bumper mounting structure, the mounting base is placed inside the end of the side member while the first vertical flange is in contact with the inner surface of the end of the side member and the hook is in contact with the outer surface of the end of the side member. Since the side part of the side member needs to be sandwiched between the first vertical flange and the hook part, high dimensional accuracy is required between the mounting base part and the hook part when forming the bumper stay. There was a problem that productivity was bad.

  Therefore, an object of the present invention is to obtain a bumper mounting structure that can improve energy absorption efficiency and can be easily assembled.

  The present invention provides a bumper mounting structure in which both ends in the vehicle width direction of a bumper reinforcement are attached to the ends of a pair of side members located on both sides in the vehicle width direction and extending in the vehicle front-rear direction. The bumper stay includes a stay main body coupled to the bumper reinforcement, and a side member attaching member interposed between the stay main body and the side member and coupled to the side member. The member mounting member is coupled to the stay main body and is capable of contacting an end surface of the side member, and a flange portion extending from the contact surface and in surface contact with at least the outer surface of the side wall of the side member. And an extension portion provided between the flange portion and the contact surface, and the flange portion of the side member mounting member is interposed via a fastening member. The most important feature that is fastened to the exterior side wall of the side member.

  According to the present invention, it is possible to attach the bumper stay to the side member only by fastening the flange portion extended from the contact surface with the fastening member in a state of being in surface contact with at least the outer surface of the side wall of the side member. The bumper stay can be easily attached to the side member.

  In addition, since the flange extending from the bumper stay is fastened in contact with the outer surface of the side member via the extension, the extension extends even if a bending load is applied to the bumper stay in the vehicle width direction. Because the bending load can be received at the contact surface between the outer surface of the vehicle outer side wall and the flange portion while allowing the bending load and absorbing energy, it is possible to suppress a large load from acting locally. Therefore, the side member can be prevented from bending and deforming inward in the vehicle width direction. That is, the bending rigidity of the connection portion between the flange portion and the side member can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a front bumper mounting structure at the front of the vehicle body is illustrated.

  (First Embodiment) FIG. 1 is a plan view showing a collision load input state at the front of the vehicle body, FIG. 2 is a perspective view of a bumper reinforcement mounting portion, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is an enlarged cross-sectional view corresponding to FIG. 3 in a collision load input state.

  In the present embodiment, as shown in FIG. 1, a pair of left and right front side members (side members) 1, 1 positioned on both sides in the vehicle width direction extend in the vehicle front-rear direction in the engine room ER. The front side members 1 and 1 are formed in a closed cross section having a substantially rectangular cross section, and the engine E is supported on the front side members 1 and 1 via a mount member (not shown).

  In addition, a radiator core support 2 is disposed in the vehicle front end portion (left side in FIG. 1) of the engine room E / R so as to extend in the vehicle width direction. The radiator core support 2 includes an engine radiator and an air conditioner. The evaporator and condenser of the device are attached, and various other auxiliary machines are installed.

  Further, a hood ridge member F / M extends in the vehicle front-rear direction above the front side members 1, 1, and the front end of the hood ridge member F / M extends through the front connecting portion F / Mc in the vehicle width of the radiator core support upper. It is connected to each direction end.

  As shown in FIG. 2, both end portions in the vehicle width direction of the bumper reinforcement 4 of the front bumper are connected to the end portions of the front side members 1, 1, that is, the front end portion 1 f located in front of the vehicle via the bumper stay 3. It is attached.

  In the present embodiment, as shown in FIG. 3, the bumper stay 3 is disposed between the side member 1 and the bumper reinforcement 4, and the stay main body 31 coupled to the bumper reinforcement 4, and the stay main body And a back plate 32 as a side member mounting member that is interposed between the front side member 1 and is coupled to the front side member 1.

  The stay main body 31 is formed in a closed cross section having a substantially rectangular cross section, and is formed so as to follow the closed cross sectional shape of the front side member 1 described above. A front plate 33 is joined to the front end portion 31f of the stay main body portion 31 by welding so as to close the front end opening, and the front plate 33 is inserted into the insertion hole 33h of the bolt 5 for fastening to the bumper reinforcement 4. Is formed.

  The back plate 32 is fixed to the rear end 31r of the stay main body 31 by welding so as to close the rear end opening of the stay main body 31. As shown in FIG. 3, the back plate 32 is formed in a projecting shape at the center, and is coupled to the stay body 31 so that the center is located inward of the stay body 31. ing. An opening 32 h is formed at the center of the back plate 32.

  Further, in the present embodiment, the back plate 32 includes a contact surface 34 that can contact the end surface of the front side member 1 at the time of a collision, and an outer surface of the vehicle outer side wall 1Sout of the front side member 1 that extends from the contact surface 34. A flange portion 35 that makes surface contact and an extension portion 36 provided between the flange portion 35 and the contact surface 34 are provided.

  The abutting surface 34 is provided at a peripheral portion where the back plate 32 is coupled to the stay main body 31. In this embodiment, the abutting surface 34 is a later-described radiator core that closes the front end opening of the front side member 1. It contacts the support side 2S.

  That is, as shown in FIG. 2, the front end opening of the front side member 1 is closed by the radiator core support side 2 </ b> S that forms the vehicle width direction side portion of the radiator core support 2 (see FIG. 1).

  In the present embodiment, as shown in FIG. 3, the radiator core support side 2 </ b> S is bent into a substantially L-shaped cross section, and the vehicle outer end 2 </ b> So of the radiator core support side 2 </ b> S is connected to the front side member 1. The tip end opening of the front side member 1 is closed by arranging it in the vicinity of the vehicle outer side wall 1Sout and arranging the vehicle inner end 2Si along the outer surface of the vehicle inner side wall 1Sin of the front side member 1. .

  Further, the front end 1fin of the vehicle interior side wall 1Sin of the front side member 1 is bent in a substantially L-shaped cross section along the inner surface of the radiator core support side 2S. On the other hand, the front end portion 1fo of the vehicle outer side wall 1Sout is terminated in the vicinity of the radiator core support side 2S, and the end portion of the front end portion 1fo of the vehicle outer side wall 1Sout and the vehicle outer end portion 2So of the radiator core support side 2S are connected. They are connected by a reinforcing plate 6 having a substantially L-shaped cross section.

  The reinforcing plate 6 is welded in advance to the radiator core support side 2S side and is fastened to the vehicle outer side wall 1Sout side by bolts 7 described later.

  The flange portion 35 is formed by bending an extension portion formed by extending the vehicle outer side (upper side in the drawing) of the contact surface 34 along the outer surface of the vehicle outer side wall 1Sout. Thus, by bending the extension portion along the outer surface of the vehicle outer side wall 1Sout, the flange portion 35 is brought into surface contact with the outer surface of the vehicle outer side wall 1Sout of the front side member 1, and the extending portion 36 is provided at the bent portion. Forming.

  Then, after the bolt 5 inserted through the insertion hole 33h of the front plate 33 of the stay main body 31 is inserted into the opening 4rh formed in the rear surface 4r of the bumper reinforcement 4, the mounting formed on the front surface 4f of the bumper reinforcement 4 is formed. The bumper reinforcement 4 is attached to the bumper stay 3 by screwing and tightening the nut 5a inserted through the hole 4fh to the bolt 5 and connecting the stay body 31 and the bumper reinforcement 4.

  Further, the bumper stay 3 is attached to the front side member 1 by applying the flange portion 35 to the vehicle outer side wall 1Sout of the front side member 1 and fastening the flange portion 35 and the vehicle outer side wall 1Sout with bolts 7 as fastening members. It is attached.

  In the present embodiment having the above configuration, as shown in FIG. 1, when a collision load F is input between the left and right bumper stays 3, 3 of the bumper reinforcement 4, the bumper reinforcement 4 is deformed rearward of the vehicle at the collision portion. Therefore, a bending moment M is generated in the bumper stay 3 toward the inner side in the vehicle width direction. In FIG. 1, C · O is a collision target.

  At this time, the flange portion 35 is fastened via the bolt 7 in surface contact with the vehicle outer side wall 1Sout of the front side member 1, that is, the flange portion 35 is the same as the vehicle outer side wall 1Sout of the front side member 1. Since it is fastened in a plane, the outer surface of the vehicle outer side wall 1Sout and the flange portion 35 are allowed to some extent by the extension portion 36 between the stay main body portion 31 and the flange portion 35 because the bending load applied to the bumper stay 3 is allowed. It will be received at the contact surface. As a result, it is possible to suppress a large load from acting locally on the outer surface of the vehicle outer side wall 1Sout of the front side member 1, so that the front side member 1 is bent and deformed inward in the vehicle width direction. It will be suppressed.

  According to the present embodiment described above, the bumper stay 3 is simply fastened by the bolt 7 in a state where the flange portion 35 extended from the contact surface 34 is in surface contact with at least the outer surface of the outer side wall 1Sout of the front side member 1. It can be attached to the front side member 1. Therefore, it is only necessary to form a flange portion 35 in surface contact with the outer surface of the vehicle outer side wall 1Sout of the front side member 1 on the back plate 32, and it is not necessary to process the back plate 32 with high precision. 3 is improved, and an inexpensive product can be provided.

  Further, since the flange portion 35 is simply applied to the outer surface of the vehicle outer side wall 1Sout of the front side member 1 and fastened, the bumper stay 3 can be easily attached to the front side member 1.

  Furthermore, according to the present embodiment, the flange portion 35 is fastened in surface contact with the outer surface of the front side member 1 via the extension portion 36 between the stay main body portion 31 and the flange portion 35. Even when a bending load is applied to the bumper stay 3, the bending load can be received while absorbing energy at the contact surface between the outer surface of the vehicle outer side wall 1Sout and the flange portion 35. Therefore, it is possible to suppress a large load from acting locally on the outer surface of the vehicle outer side wall 1Sout, thereby suppressing the front side member 1 from being bent and deformed inward in the vehicle width direction. Can do. That is, the bending rigidity of the connecting portion between the flange portion 35 and the front side member 1 can be improved.

  Further, according to the present embodiment, since the extending portion 36 is provided between the flange portion 35 and the abutting surface 34, the collision load in the vehicle front-rear direction input from the abutting surface 34 in the longitudinal direction of the front side member 1. F can be absorbed by the extension 36. As a result, since it is suppressed that a big load is input into the connection part of the flange part 35 and the front side member 1, it can suppress that the volt | bolt 7 which fastened the flange part 35 loosens. In particular, when the collision load F is relatively light so as not to greatly deform the contact surface 34, there is an advantage that the fastening state of the flange portion 35 can be ensured.

  Moreover, according to this embodiment, since the front-end | tip opening part of the front side member 1 is obstruct | occluded by the radiator core support side 2S, the rigidity of the front side member 1 in the front-back direction can be improved further.

  (Second Embodiment) FIG. 5 is an enlarged cross-sectional view of a main part of a connecting portion between a side member mounting member and a side member according to this embodiment. In addition, the bumper attachment structure concerning this embodiment is provided with the component similar to the bumper attachment structure concerning the said 1st Embodiment. Therefore, the same constituent elements are denoted by common reference numerals, and redundant description is omitted.

  As shown in FIG. 5, the bumper stay 3 according to the present embodiment basically includes a stay main body 31 and a back plate 32 as in the first embodiment. A contact surface 34, a flange portion 35, and an extension portion 36 are provided.

  The main difference between the present embodiment and the first embodiment is that between the contact surface 34 and the end surface of the front side member 1, that is, between the radiator core support side 2S, the contact surface 34 and the front side member at the time of collision. 1 is provided with a gap δ that allows contact with 1.

  Also according to this embodiment described above, the same effect as in the first embodiment can be obtained.

  Further, according to the present embodiment, since the gap δ is provided between the contact surface 34 and the radiator core support side 2S at the end surface of the front side member 1, when the collision load F is input, first, FIG. As shown by the middle broken line, the abutting surface 34 abuts on the radiator core support side 2S with a large bending deformation of the extending portion 36, and the collision load F is released in the longitudinal direction of the front side member 1 by the abutment.

  At this time, since the extension portion 36 is greatly deformed by providing the gap δ, the amount of absorption of the collision load F increases, and the collision load F transmitted from the contact surface 34 to the flange portion 35 can be further reduced. As a result, the slack of the bolt 7 can be more effectively suppressed.

  (Third Embodiment) FIG. 6 is an enlarged cross-sectional view of a main part of a joint portion between a side member mounting member and a side member according to this embodiment. In addition, the bumper attachment structure concerning this embodiment is provided with the component similar to the bumper attachment structure concerning the said 1st and 2nd embodiment. Therefore, the same constituent elements are denoted by common reference numerals, and redundant description is omitted.

  As shown in FIG. 6, the bumper stay 3 of the present embodiment basically includes a stay main body 31 and a back plate 32, as in the first embodiment. A surface 34, a flange portion 35, and an extension portion 36 are provided.

  In the present embodiment, as in the second embodiment, a gap δ is provided between the contact surface 34 and the radiator core support side 2S serving as the end surface of the front side member 1. In the present embodiment, a structure in which a gap δ is provided between the contact surface 34 and the radiator core support side 2S is illustrated. However, as shown in the first embodiment, the contact surface 34 has the radiator core support side. The present embodiment can be applied even when it is in contact with 2S.

  The main difference between the present embodiment and the above embodiments is that a bead B extending in the vertical direction is provided in the extending portion 36.

  In the present embodiment, the bead B is formed by making the bent portion formed between the abutting surface 34 and the flange portion 35 project greatly in the vehicle exterior direction to have an acute angle. Moreover, this bead B is formed continuously in the vertical direction.

  Also according to this embodiment described above, the same effects as those of the first and second embodiments can be obtained.

  Further, according to the present embodiment, by providing the bead B in the extending portion 36, when the collision load F is input, not only the extending portion 36 but also the bead B can be deformed. In this manner, by deforming not only the extending portion 36 but also the bead B, the absorption efficiency of the collision load F can be further increased, so that loosening of the bolt 7 can be more effectively suppressed.

  The preferred embodiment of the bumper mounting structure according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various embodiments can be adopted without departing from the gist.

  For example, in the above embodiment, as the side member mounting member, a member in which the flange portion is extended so as to be in surface contact with the vehicle outer side wall of the front side member from the abutting surface is used. It is also possible to use a member extended to another part of the front side member.

  Moreover, in the said embodiment, although the bending part is provided as an expansion | extension part, you may make it provide not only this but a several panel as a slide structure, and an expansion | extension part.

  Furthermore, in the above embodiment, the front bumper mounting structure has been described as an example. However, the present invention is not limited to this and can be applied to the rear bumper.

The top view which shows the collision load input state of the vehicle body front part concerning 1st Embodiment of this invention. The perspective view of the attachment part of the bumper reinforcement concerning 1st Embodiment of this invention. AA sectional drawing of FIG. The expanded sectional view corresponding to Drawing 3 in the collision load input state concerning a 1st embodiment of the present invention. The principal part expanded sectional view of the coupling | bond part of the side member attachment member and side member concerning 2nd Embodiment of this invention. The principal part expanded sectional view of the junction part of the side member attachment member and side member concerning 3rd Embodiment of this invention.

Explanation of symbols

1 Front side member (side member)
2 Radiator core support 2S Radiator core support side 1Sout Car outer side wall 3 Bumper stay 4 Bumper reinforcement 7 Bolt (fastening member)
31 Stay body 32 Back plate (side member mounting member)
34 Abutting surface 35 Flange part 36 Extension part δ Gap B Bead

Claims (5)

In the bumper mounting structure in which both ends in the vehicle width direction of the bumper reinforcement are attached to the ends of the pair of side members located on both sides in the vehicle width direction and extending in the vehicle longitudinal direction,
The bumper stay includes a stay main body portion coupled to the bumper reinforcement, a side member attaching member interposed between the stay main body portion and the side member, and coupled to the side member,
The side member mounting member is coupled to the stay main body and can be brought into contact with the end surface of the side member. The side member mounting member extends from the contact surface and is in surface contact with at least the outer surface of the side wall of the side member. A flange portion, and an extension portion provided between the flange portion and the contact surface,
A bumper mounting structure, wherein a flange portion of the side member mounting member is fastened to a vehicle outer side wall of the side member via a fastening member.   2. The bumper mounting structure according to claim 1, wherein, when a load is input to a bumper reinforcement between the side members, the extension portion extends to allow a rotational moment inward in the vehicle width direction. .   The bumper mounting structure according to claim 1, wherein a gap is provided between a contact surface of the side member mounting member and an end surface of the side member.   The bumper mounting structure according to any one of claims 1 to 3, wherein a bead extending in a vertical direction is provided in the extension portion.   The bumper mounting structure according to any one of claims 1 to 4, wherein a front end of the side member is closed with a side member of a radiator core support.

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