JP6051813B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure including a reinforcing member against an impact load from the front.

  As a conventional vehicle body structure, a technique is known in which both ends of an impact absorbing member serving as a reinforcing member are attached to left and right rear frames that extend in the longitudinal direction of the vehicle body via left and right mounting brackets (Patent Document 1 below). reference). The mounting bracket described above includes mounting surfaces on two surfaces, a surface intersecting the vehicle width direction and a surface intersecting the vertical direction.

JP 2008-230556 A

  Thus, in the conventional vehicle body structure, the mounting bracket for mounting the reinforcing member has a mounting surface in two directions, so that the mounting position of the reinforcing member is limited, and the degree of freedom of the mounting position becomes insufficient. Yes.

  Accordingly, an object of the present invention is to provide more flexibility as the attachment position of the reinforcing member.

  The present invention includes a reinforcing member that connects a side width direction side portion of a side member and a vehicle body rear side portion of a cross member, and an attachment for attaching an end portion of the reinforcing member to at least one of the side member and the cross member The mounting bracket has an extension portion that extends in the vertical direction on both the upper and lower sides of the reinforcing member, and the extension portion receives a load so that the reinforcing member is displaced in the vertical direction by an impact load that the vehicle body receives from the front. Sometimes, it is pressed against either the side member or the cross member on the side where the mounting bracket is provided.

  According to the present invention, the reinforcing member connects the side member side direction portion of the side member and the vehicle body rear side portion of the cross member obliquely with respect to the vehicle body longitudinal direction. As a result, the mounting surface of the reinforcing member with respect to each member need only be a surface that intersects in the horizontal direction, and a surface that intersects in the vertical direction becomes unnecessary, so that the mounting position of the reinforcing member can be given more flexibility. In this case, in the present invention, when the load is received so that the reinforcing member is displaced in the vertical direction due to the impact load that the vehicle body receives from the front, the extension portion includes the side member and the cross member on the side where the mounting bracket is provided. The displacement of the reinforcing member in the vertical direction can be suppressed by being pressed against one of the two and opposing the load.

It is a perspective view which shows the main frame structures in the vehicle body front part of the vehicle body structure which concerns on one Embodiment of this invention. It is the perspective view which abbreviate | omitted the front pillar with respect to FIG. FIG. 3 is a view as seen from an arrow A in FIG. 2. It is a perspective view of the connection pipe containing the front side and rear side mounting bracket used for the vehicle body structure of FIG. It is the perspective view seen from the vehicle body front side of the connection pipe containing the front side and rear side mounting bracket of FIG. It is BB sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a main skeletal structure at the front part of a vehicle body structure according to an embodiment of the present invention. The direction indicated by an arrow FR in the figure is the front side of the vehicle body, and the direction indicated by the arrow UPR is the upper side of the vehicle body. is there. This vehicle structure is constructed by connecting left and right front side members (hereinafter simply referred to as side members) 1 extending in the longitudinal direction of the vehicle body on both sides of the vehicle body and the left and right side members 1 on the front side of the vehicle body. A front cross member 3 (hereinafter simply referred to as a cross member) extending in the width direction is provided.

  The left and right side members 1 include a front protrusion 1a that protrudes forward of the vehicle body relative to the cross member 3. The cross member 3 protrudes outward in the vehicle width direction with respect to the left and right side members 1 in the vehicle width direction. It has. As shown in FIG. 1, the lower end of a front pillar 5 extending in the vehicle body vertical direction is connected to the end 3a1 of the vehicle width direction protruding portion 3a shown in FIG.

  FIG. 2 is a view in which the front pillar 5 is omitted from FIG. 1, and the vehicle width direction side portion 1 b on the outer side in the vehicle width direction of the side member 1 and the vehicle body rear side of the vehicle width direction protruding portion 3 a of the cross member 3. The part 3b is mutually connected with the connection pipe 7 as a reinforcement member. The connecting pipe 7 is attached to both the left and right side members 1 symmetrically.

  FIG. 3 is a view taken in the direction of arrow A in FIG. 2 showing the periphery of the connecting pipe 7 connected to the side member 1 on the right side in the vehicle width direction. The connection pipe 7 connects the front end 7 a on the vehicle body front side and the vehicle width direction outer side to the vicinity of the end 3 a 1 of the vehicle width direction protrusion 3 a of the cross member 3 via the front mounting bracket 9. The connecting pipe 7 connects the rear end 7 b on the rear side of the vehicle body and in the vehicle width direction to the side member 1 via the rear mounting bracket 11. As a result, the connecting pipe 7 connects the side member 1 and the cross member 3 obliquely with respect to the longitudinal direction of the vehicle body.

  As shown in FIGS. 4 and 5, the front mounting bracket 9 accommodates a flat and rectangular fixing portion 9 a that contacts the vehicle body rear side portion 3 b of the cross member 3 and the front end portion 7 a of the connecting pipe 7. And a pipe housing recess 9b.

  The pipe housing recess 9b is formed by press-molding a projection 9c that protrudes toward the rear of the vehicle body at the center in the vertical direction of the fixed portion 9a. Further, the pipe receiving recess 9b is opened on the rear mounting bracket 11 side so that the rear mounting bracket 11 side (left side in FIG. 4) gradually protrudes the protruding portion 9c from the opposite side. The connecting pipe 7 can be inserted from the opening side.

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A long hole 9 d is formed along the extending direction of the connecting pipe 7 on the protruding front end side of the convex portion 9 c of the front mounting bracket 9 described above. Then, with the front end portion 7a of the connecting pipe 7 being accommodated and disposed in the pipe accommodating recess 9b, carbon dioxide arc welding is performed at two locations above and below the elongated hole 9d in parallel with the extending direction of the connecting pipe 7 to weld fixing portions 13 And the connecting pipe 7 is fixed to the rear mounting bracket 11 by welding.

  Mounting holes 9e are formed at two locations above and below the pipe housing recess 9b of the fixing portion 9a of the front mounting bracket 9. A bolt 15 shown in FIG. 3 is inserted into the mounting hole 9 e and fastened to the cross member 3 to attach the front mounting bracket 9 to the cross member 3.

  The rear mounting bracket 11 includes a mounting plate 17 as a plate member fixed to the side member 1 and a pair of upper and lower connecting members 19 fixed to the mounting plate 17 and the rear end portion 7b of the connecting pipe 7 by welding. I have. The mounting plate 17 is constituted by a plate-like member that is long along the extending direction of the side member 1, and has mounting holes 17 a formed at two locations on the front side and one on the rear side. The rear mounting bracket 11 is attached to the side member 1 by inserting the bolts 20 shown in FIG. 3 into these three mounting holes 17 a and fastening them to the side member 1.

  The pair of upper and lower connecting tools 19 are vertically symmetrical with respect to a horizontal plane. As shown in FIG. 5, the connector 19 includes an attachment reinforcing portion 21 formed of a substantially triangular flat plate member as viewed from above and below the vehicle body, and a pipe fixing portion 23 that is welded and fixed to the connection pipe 7. And.

  The mounting reinforcing portion 21 is integrated by being surface-bonded in a state of being overlapped with each other between the pair of upper and lower connecting devices 19, and being welded and fixed by spot welding. At that time, a concave portion is formed in one mounting reinforcing portion 21 and a convex portion is formed in the other mounting reinforcing portion 21, and the concave portion and the convex portion are aligned with each other, and two locations are provided along the longitudinal direction of the connecting pipe 7. The positioning part 25 is formed. Then, in a state where one side edge of the pair of attachment reinforcing portions 21 joined to each other is in contact with the attachment plate 17, carbon dioxide arc welding is performed on both upper and lower sides to form a weld fixing portion 27, and the attachment reinforcement portion 21 is fixed to the mounting plate 17 by welding.

  As shown in FIG. 6, the pipe fixing portion 23 of the pair of upper and lower connecting tools 19 includes an arc portion 23 a that is joined over almost a quarter of the circumferential direction of the connecting pipe 7, and an attachment reinforcing portion 21 of the arc portion 23 a. And a flange portion 23b extending in the vertical direction from the opposite end portion. In this case, the flange portion 23 b is located at the center O of the connection pipe 7 in a direction orthogonal to the extension direction of the connection pipe 7 and in the horizontal direction. This means that a straight line P that connects the upper and lower flange portions 23 b in the vertical direction passes through the center O of the connecting pipe 7.

  The flange 23b constitutes an upper extension for the upper connector 19, and constitutes a lower extension for the lower connector 19. Accordingly, the upper and lower extensions are integrated with the attachment reinforcing portion 21 of the rear attachment bracket 11.

  The pipe fixing portion 23 is in contact with the mounting plate 17 in the same manner as one side edge of the mounting reinforcing portion 21 from the arc portion 23a to the flange portion 23b. Among them, as shown in FIG. 4, the flange portion 23 b is welded and fixed to the mounting plate 17 by performing a carbon dioxide arc in the above contact state to form a weld fixing portion 29.

  As shown in FIG. 5, a long hole 23 c is formed in the arc portion 23 a of the pipe fixing portion 23 along the extending direction of the connecting pipe 7. A carbon dioxide arc is formed at one place in the lower hole parallel to the extending direction of the connecting pipe 7 in the long hole 23 c to form a weld fixing portion 31, and the arc portion 23 a is fixed to the connecting pipe 7 by welding. As shown in FIG. 4, a carbon dioxide arc is applied between the bases of the upper and lower flange portions 23 b and the connection pipe 7 to form a weld fixing portion 33. Further, the connection pipe 7 is welded and fixed to the mounting plate 17 by bringing the end surface of the rear end portion 7b into contact with the mounting plate 17 and forming a welding fixing portion 35 by a carbon dioxide arc in the corresponding contact state.

  In this way, the pair of upper and lower connecting tools 19 are integrated with the connecting pipe 7 by overlapping and fixing the attachment reinforcing portions 21 to each other and welding and fixing the arc portion 23 a to the connecting pipe 7. Then, one side edge of the attachment reinforcing portion 21 and the side edge portion of the flange portion 23b in the integrated connector 19 are welded and fixed to the mounting plate 17 by welding fixing portions 27 and 29, respectively, and the end of the connection pipe 7 is also fixed. The part is welded and fixed to the mounting plate 17 by the welding fixing part 35.

  As described above, the mounting plate 17 is mounted in a state of being surface-bonded to the side member 1 by fastening the bolt 20 shown in FIG. As a result, the rear end 7 b of the connection pipe 7 is connected to the side member 1 via the rear mounting bracket 11. Further, as described above, the front end 7 a of the front mounting bracket 9 is connected to the cross member 3 via the front mounting bracket 9. As a result, the connecting pipe 7 connects the side member 1 and the cross member 3 to each other.

  The vehicle body structure according to one embodiment of the present invention is configured as described above. Here, when a vehicle having such a vehicle body structure collides with an obstacle (not shown) from the front, an offset such that the vicinity of a portion including the side member 1 located on the outer side in the vehicle width direction collides particularly from the center in the vehicle width direction. Assume a collision.

  In this case, the side member 1 receives the impact load and is crushed and deformed in the axial direction (vehicle body longitudinal direction), and the impact load is transmitted to the cross member 3. At that time, the projecting portion 3a in the vehicle width direction of the cross member 3 is restrained from being deformed backward by the connecting pipe 7 serving as a reinforcing member. As a result, movement of the front pillar 5 whose lower end is connected to the vehicle width direction protruding portion 3a to the rear of the vehicle body is suppressed, deformation of the vehicle interior is suppressed, and the influence on the vehicle interior due to the collision is minimized. be able to.

  Further, at the time of the above-described offset collision, the connecting pipe 7 may receive a bending load that is displaced so as to bend in the vertical direction. Here, the flange portion 23 b of the pair of upper and lower connectors 19 in the rear side mounting bracket 11 is in contact with the side member 1 via the mounting plate 17 at the welding fixing portion 29. In this case, when a load is applied so that the connecting pipe 7 is displaced in a direction that bends up and down with respect to the side member 1, the side edge portion of the flange portion 23 b is attached to the side member 1 via the mounting plate 17 at the above-described weld fixing portion 29. Against the load described above.

  Thereby, the bending deformation of the connection pipe 7 with respect to the side member 1 in the vertical direction can be suppressed. As a result, even if the connecting pipe 7 receives a bending load that is displaced so as to bend in the vertical direction, the deformation of the connecting pipe 7 can be suppressed, the deformation of the cross member 3 can be suppressed, and the deformation of the front pillar 5 can also be suppressed.

  At this time, in this embodiment, the connecting pipe 7 which is a reinforcing member is connected to the vehicle width direction side portion 1b of the side member 1 and the vehicle body rear side portion 3b of the cross member 3 obliquely with respect to the vehicle body longitudinal direction. ing. As a result, the attachment surface of the connection pipe 7 to the side member 1 and the cross member 3 need only be a surface that intersects in the horizontal direction, and a surface that intersects in the vertical direction is not necessary. You can have it.

  In the present embodiment, the flange portion 23 b is integrated with the mounting reinforcement portion 21 of the rear mounting bracket 11. Here, the attachment reinforcing portion 21 integrated with the pipe fixing portion 23 fixed to the connection pipe 7 is attached to the attachment plate 27 at one side edge by the welding fixing portion 27 when the connection pipe 7 is fixed to the attachment plate 17 by welding. The fixing state of the connecting pipe 7 to the mounting plate 17 is reinforced by welding and fixing to 17. By integrating the flange portion 23b into the mounting reinforcement portion 21 as described above, an increase in the number of parts can be suppressed and an increase in manufacturing cost can be suppressed as compared with a case where the flange portion 23b is separately provided as a single product. Can do.

  Moreover, in this embodiment, the attachment reinforcement part 21 was comprised by the flat plate member integral with the upper attachment reinforcement part comprised by the upper flange part 23b, and the lower flange part 23b. The lower mounting reinforcement portion is joined and fixed in a state of being overlapped with each other. Thereby, the intensity | strength of the attachment reinforcement part 21 increases and the impact resistance characteristic of the connection pipe 7 at the time of a vehicle collision mentioned above improves.

  In the present embodiment, each of the upper and lower attachment reinforcing portions 21 is located at the center of the connection pipe 7 in the direction orthogonal to the extension direction of the connection pipe 7 and in the horizontal direction. That is, a straight line P that connects the upper and lower flange portions 23 b in the vertical direction passes through the center O of the connecting pipe 7.

  Thereby, when the setting position of the circumferential direction to the connection pipe 7 of the upper and lower flange portions 23b is at a position farther from or closer to the mounting reinforcing portion 21 in FIG. 6 than the position in FIG. As compared with the above, the load bearing characteristics of the flange portion 23b are improved. In addition, since the arc portion 23a is joined over almost ¼ of the circumferential direction of the connecting pipe 7, a sufficient weld-joining area for the connecting pipe 7 can be secured, and the connecting tool 19 can be more securely fixed to the connecting pipe 7. It will be something.

  In this embodiment, the rear mounting bracket 11 including the upper and lower flange portions 23b includes a mounting plate 17 that is fixed to the side member 1 on the side where the rear mounting bracket 11 is provided. ing. Then, the end portion of the connecting pipe 7 is joined and fixed to the mounting plate 17, and one side edge of the mounting reinforcing portion 21 is joined and fixed. Thereby, since the connection pipe 7 is united with the rear side mounting bracket 11 and also with the front side mounting bracket 9, these can be easily attached to a vehicle body as a reinforcement member unit.

  In the present embodiment, each of the upper and lower extensions is configured by a flange 23b that protrudes upward and downward from the surface of the connection pipe 7, and the side edge of the flange 23b is a rear end. It is arranged to face the side member 1 on the side where the side mounting bracket 11 is provided. Even if the connecting pipe 7 is subjected to a bending load that is displaced so as to be bent in the vertical direction, a simple configuration in which the flange portion 23b is simply formed and the flange portion 23b is disposed to face the side member 1, Deformation of the connecting pipe 7 can be suppressed.

  In the present invention, a bracket constituent member similar to the rear mounting bracket 11 including the pair of upper and lower connectors 19 and the mounting plate 17 is provided on the front end 7a of the connecting pipe 7 in which the front mounting bracket 9 is set. You can also.

  Further, the flange portion 23 b has the side edge portion brought into contact with the mounting plate 17 by the welding fixing portion 29, but the side edge portion may be brought into close proximity without being brought into contact with the mounting plate 17. Even when the connection pipe 7 is not brought into contact with each other, when the connection pipe 7 receives a bending load in the vertical direction, the side edge portion of the extension 23b comes into contact with the mounting plate 17 so as to resist the load. Suppresses vertical displacement.

1 Side member 3 Cross member 7 Connection pipe (reinforcing member)
7a Front end of connecting pipe (end of reinforcing member)
7b Rear end of connecting pipe (end of reinforcing member)
11 Rear mounting bracket (Mounting bracket)
17 Rear mounting bracket mounting plate (plate member)
21 Rear mounting bracket mounting reinforcement (upper mounting reinforcement, lower mounting reinforcement)
23b Flange of rear mounting bracket (upper extension, lower extension)

Claims (6)

Left and right side members extending in the longitudinal direction of the vehicle body on both sides of the vehicle body;
A cross member that connects the left and right side members and extends in the vehicle width direction;
A reinforcing member for connecting the side member in the vehicle width direction and the vehicle body rear side portion of the cross member obliquely with respect to the vehicle longitudinal direction;
A mounting bracket for attaching the end of the reinforcing member to at least one of the side member and the cross member;
The mounting bracket includes an extension extending in the vertical direction on both upper and lower sides of the reinforcing member,
The extension portion is either a side member or a cross member on the side where the mounting bracket is provided when receiving a load that causes the reinforcing member to be displaced in the vertical direction by an impact load that the vehicle body receives from the front. A vehicle body structure which is pressed against one of the side portions.   The vehicle body structure according to claim 1, wherein the extension portion is integrated with a mounting reinforcement portion of the mounting bracket.   The extension includes an upper extension and a lower extension located on the upper side and the lower side of the reinforcing member, respectively, and the attachment reinforcing part is an upper mounting composed of a flat plate member integrated with the upper extension. It has a reinforcing part and a lower mounting reinforcing part composed of a flat plate member integrated with the lower extension part, and the upper mounting reinforcing part and the lower mounting reinforcing part are joined and fixed in a state of being overlapped with each other. The vehicle body structure according to claim 2, wherein the vehicle body structure is provided.   4. The upper extension portion and the lower extension portion are located at the center of the reinforcing member in a direction perpendicular to the extending direction of the reinforcing member and in the horizontal direction. The vehicle body structure described in the item.   The mounting bracket having the upper extension portion and the lower extension portion includes a plate member that is fixed to either the side member or the cross member on the side where the mounting bracket is provided. 4. The vehicle body structure according to claim 3, wherein an end portion of the reinforcing member is bonded and fixed, and one side edge of the mounting reinforcing portion is bonded and fixed.   The upper extension portion and the lower extension portion are each configured by a flange portion that protrudes upward and downward from the surface of the reinforcing member, and the side edge portion of the flange portion is the side on which the mounting bracket is provided. The vehicle body structure according to any one of claims 1 to 5, wherein the vehicle body structure is disposed so as to face either one of the side member and the cross member.

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