JP5509265B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure in which extensions respectively extend toward the front of a vehicle body from front end portions of left and right front side frames and front end portions of left and right upper members.

  Some vehicle bodies have a configuration in which the inner extension extends from the front ends of the left and right front side frames toward the front of the vehicle body, and the outer extension extends from the front ends of the left and right upper members toward the front of the vehicle body. is there. In recent years, development of such a vehicle body front structure has been advanced. (For example, refer to Patent Document 1 (FIG. 1).)

  The vehicle body disclosed in Patent Document 1 includes left and right front side frames that extend in the longitudinal direction of the vehicle body on both left and right sides, and the front and lower sides of the left and right front pillars on the outside in the vehicle width direction and on the upper side. The left and right upper members that extend, the left and right inner extensions extending forward from the front ends of the left and right front side frames, the left and right outer extensions extending forward from the front ends of the left and right upper members, and between the left and right outer extensions And bumper beams to which left and right inner extensions and left and right outer extensions are attached.

  When a so-called narrow offset collision occurs in which a collision load (front collision load) acts from the front in a narrow area at the outer end of the vehicle width at the front part of the vehicle, the front collision load is applied to the left and right inner and outer extensions from the bumper beam. It is transmitted to. Each extension can absorb an impact by being crushed by the front impact load.

  In general, during the traveling of the vehicle, various external forces act on the vehicle body depending on the traveling state. For example, depending on the posture of the traveling vehicle, a torsional force is applied to the left and right front side frames and the left and right upper members. On the other hand, in order to further improve the steering stability of the vehicle, it is required to increase the rigidity in the vicinity of the front end portion of the vehicle body, particularly the torsional rigidity. However, simply increasing the rigidity in the vicinity of the front end of the vehicle body cannot ensure sufficient shock absorption performance in the event of a narrow offset collision due to a front collision load, and there is room for improvement.

JP 2010-83453 A

  It is an object of the present invention to provide a technique capable of improving the steering stability of a vehicle while ensuring the shock absorption performance in the longitudinal direction of the vehicle body against a narrow offset collision.

  According to the first aspect of the present invention, the left and right front side frames extending in the longitudinal direction of the vehicle body on the left and right sides of the front portion of the vehicle body, and the front and lower sides of the left and right front side frames on the outer side in the vehicle width direction and on the upper side from the left and right front pillars. Vehicle body front structure, including left and right upper members extending to the left, left and right inner extensions extending forward from the front ends of the left and right front side frames, and left and right outer extensions extending forward from the front ends of the left and right upper members The left mounting plate provided between the front ends of the left inner and outer extensions, the right mounting plate provided between the front ends of the right inner and outer extensions, and extending in the vehicle width direction, And a bumper beam attached to the attachment plate.

  In the invention according to claim 2, the left and right mounting plates are each composed of at least two front and rear reinforcing members, and the left and right front and rear two reinforcing members are overlapped and integrated with each other in the longitudinal direction of the vehicle body. The upper flange extends from the upper end in the front-reverse direction, and the lower flange extends from the lower end in the front-rear direction. The two right and left reinforcing members are also overlapped and integrated with each other in the vehicle longitudinal direction. And having an upper flange extending from the upper end in the reverse direction to the front, and a lower flange extending from the lower end in the reverse direction.

  According to a third aspect of the present invention, the left and right mounting plates are composed of at least two front and rear reinforcing members that are overlapped and integrated with each other in the longitudinal direction of the vehicle body. The bumper beam has left and right openings that can be hooked to the left and right locking claws.

  In the invention according to claim 4, the bumper beam has left and right bolt mounting portions for mounting left and right eyebolts at a portion inward of the vehicle width with respect to the left and right inner extensions. It is a towing part to be towed by the left and right eyebolts.

  In the invention according to claim 1, the left mounting plate is provided between the front ends of the left inner and outer extensions. Similarly, a right mounting plate is provided between the front ends of the right inner and outer extensions. Further, the bumper beam is attached to the left and right attachment plates. That is, the front end of the left inner and outer extensions is connected by the left mounting plate, and the front end of the right inner and outer extensions is connected by the right mounting plate. For this reason, the rigidity in the vicinity of the front end portion of the vehicle body, in particular, the torsional rigidity can be increased. As a result, the steering stability of the vehicle can be improved. In addition, the bumper beam is attached to the front end of the left inner and outer extensions and the front end of the right inner and outer extensions by left and right mounting plates. Since the left and right mounting plates connect the front ends of the left and right inner and outer extensions, a so-called collision load (front collision load) acts on the narrow range of the outer width end of the front part of the vehicle from the front. When a narrow offset collision occurs, the impact absorption performance in the longitudinal direction of the vehicle body by the left and right inner and outer extensions is not affected. In this way, it is possible to improve the steering stability of the vehicle while ensuring the shock absorption performance in the longitudinal direction of the vehicle body against the narrow offset collision.

  In the invention according to claim 2, the left and right mounting plates are each composed of two front and rear reinforcing members, each having an upper flange extending in the front-rear direction from the upper end and a lower flange extending in the front-reverse direction from the lower end. doing. By overlapping the two reinforcing members and extending the flange from the upper and lower ends, the rigidity in the vicinity of the front end of the vehicle body, particularly the torsional rigidity, can be further increased.

  In the invention according to claim 3, the left and right front reinforcing members have left and right locking claws extending forward of the vehicle body, and the bumper beam has left and right openings that can be hooked on the left and right locking claws. ing. When the vehicle is assembled, the bumper beam can be temporarily fixed by engaging the left and right openings with the left and right engaging claws, respectively. There is no need to keep the bumper beam down when the bumper beam is installed, and the assembly work becomes easy.

  In the invention according to claim 4, the bumper beam has left and right bolt mounting portions for mounting the left and right eyebolts inward of the vehicle width rather than the left and right inner extensions. That is, the bolt mounting portion is formed inward from the left and right mounting plates. A bolt mounting portion is formed inside the vehicle width of the mounting plate whose rigidity is increased. When an eyebolt is attached to the bolt attachment portion and the vehicle is towed, a reaction force generated by towing the vehicle is applied to the bumper beam as a load. The load applied to the bumper beam is transmitted to the inner and outer extensions via the mounting plate. Due to the high rigidity of the mounting plate, the traction load can be reliably distributed over a wider range, and deformation of the bumper beam or the like during traction can be suppressed.

1 is a perspective view of a vehicle body according to the present invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a perspective view of a mounting plate, an extension, a front side frame, and an upper member shown in FIG. 3. FIG. 4 is an exploded perspective view of the mounting plate shown in FIG. 3. FIG. 6 is a perspective view of the mounting plate shown in FIG. 5. It is a figure explaining how to attach the bumper beam to the mounting plate and the bumper beam extension shown in FIG. It is a figure explaining the state which temporarily fixed the bumper beam to the attachment plate shown by FIG. FIG. 9 is a view taken in the direction of arrow 9 in FIG. 3. It is a figure explaining the method of attaching an eyebolt to the bumper beam shown by FIG. It is the 11-11 line sectional view of FIG. It is a figure explaining the effect | action of the attachment plate shown by FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In the description, left and right refer to the left and right based on the vehicle occupant, and front and rear refer to the front and rear based on the traveling direction of the vehicle.
In the figure, Fr indicates the front, Rr indicates the rear, L indicates the left when viewed from the occupant, R indicates the right when viewed from the occupant, Up indicates the top, and Dw indicates the bottom.

  As shown in FIGS. 1 to 3, the vehicle 10 is a four-door type passenger car. Inside the vehicle body 11, a front engine room 12 and a vehicle compartment 13 located just behind the engine room 12 are provided. Is formed. The vehicle body 11 is composed of a monocoque body, and is formed symmetrically with respect to a vehicle width center line CL extending in the vehicle longitudinal direction through the center of the vehicle 10 in the vehicle width direction.

  The vehicle body 11 includes left and right front side frames 15, 15, left and right upper members 21, 21, and a bulkhead 16. The left and right front side frames 15 and 15 are located on the left and right sides of the front portion of the vehicle body 11 and extend in the front-rear direction of the vehicle body 11. The left and right upper members 21 and 21 are positioned above the left and right front side frames 15 and 15 and extend in the front-rear direction of the vehicle body 11. The bulkhead 16 is a substantially rectangular frame.

  The engine room 12 and the vehicle compartment 13 are partitioned by a dashboard lower panel 18. The left and right ends of the dashboard lower panel 18 are coupled to the left and right front pillars 19 and 19.

  Left and right damper housings 27 and 27 are spanned between the left and right front side frames 15 and 15 and the left and right upper members 21 and 21, respectively. A strut tower bar 28 is passed between the left and right damper housings 27, 27.

  The left and right upper members 21 and 21 are respectively lowered from the left and right front pillars 19 and 19 to the front from the horizontal portions 21b and 21b extending substantially horizontally and the tips 21a and 21a of the horizontal portions 21b and 21b. The lower portions 21c and 21c are provided.

  Bulkhead support members 26, 26 that support the bulkhead 16 are passed from the front ends 21 a, 21 a of the left and right horizontal portions 21 b, 21 b toward the left and right upper ends 16 a, 16 a of the bulkhead 16. The left and right lower ends of the bulkhead 16 are supported by the front ends of the left and right front side frames 15 and 15.

  The left and right inner extensions 24, 24 that absorb impact when the vehicle collides extend from the front ends of the left and right front side frames 15, 15 to the front. Similarly to the left and right inner extensions 24, 24, left and right outer extensions 25, 25 that absorb impact when the vehicle collides extend from the front ends of the lowered portions 21c, 21c to the front. The left and right outer extensions 25, 25 are provided along the outside of the left and right inner extensions 24, 24. A bumper beam 17 is passed in front of these left and right outer extensions 25, 25. The relationship between the inner and outer extensions 24, 25 and the bumper beam 17 will be described in detail with reference to FIG.

  As shown in FIGS. 3 and 4, reinforcing members 44 are provided in the form of vertical plates at the tips of the left and right inner and outer extensions 24, 25. The same applies to the right side of the vehicle body 11. That is, the mounting plate is also passed to the tip of the right inner and outer extensions. The bumper beam 17 is attached to the front of the inner and outer extensions 24 and 25 via the reinforcing member 44. Hereinafter, the reinforcing member 44 is appropriately referred to as an “attachment plate 44”.

  As described above, the vehicle body is a symmetrical member with respect to the vehicle width center line CL. That is, the configuration on the left side of the vehicle body is basically the same as the configuration on the right side of the vehicle body. Hereinafter, the configuration on the left side of the vehicle body will be described as an example as appropriate, and the description on the configuration on the right side of the vehicle body will be omitted.

  Returning to FIG. 1, bolt holes 17 b and 17 b for screwing eyebolts when the vehicle is towed are formed in front of the bumper beam 17 and inward of the vehicle width from the left and right inner extensions 24 and 24. Bolt mounting portions 110 and 110 are formed in accordance with the positions of the bolt holes 17b and 17b. Details of the bolt mounting portions 110 and 110 will be described later.

The mounting plate 44 will be described in detail after FIG.
As shown in FIGS. 5 and 6, the mounting plate 44 is formed by joining two substantially L-shaped plates. By using two plates, the processing accuracy can be maintained even when a high strength steel (ultra high strength steel) having a tensile strength of 980 MPa is used.

  More specifically, the mounting plate 44 is joined to the rear reinforcing member 58 (rear plate 58) to which the inner and outer extensions 24, 25 are joined, and joined to the rear reinforcing member 58 and forward to the bumper beam (FIG. 1, reference numeral 17) includes a front reinforcing member 57 (front plate 57) to which the head 17 is attached. The front and rear reinforcing members 57 and 58 can be joined by spot welding.

  The rear reinforcing member 58 includes a plate-like bottom plate 81, an upper flange 82 raised from the upper end of the bottom plate 81 toward the rear, and a rear end from the right end (inner end) of the bottom plate 81. A right flange 83 (inner flange 83), a lower flange 84 raised rearward from the lower end of the bottom plate 81, and a rearward rise from the left end (outer end portion) of the bottom plate 81. Left flange 85 (outer flange 85). Each flange 82 to 85 is formed across each side of the bottom plate 81. The end portions of the flanges 82 to 85 are formed apart from each other.

  In the portion of the bottom plate 81 where the inner extension 24 is attached, the distance H1 from the lower surface of the upper flange 82 to the upper surface of the lower flange 84 is such that the upper surface 24c and the lower surface 24e of the inner extension 24 are in contact with each other. Is close to H2. That is, H1≈H2.

  Similarly, in the portion of the bottom plate 81 where the outer extension 25 is attached, the distance H3 from the lower surface of the upper flange 82 to the upper surface of the lower flange 84 is such that the upper surface 25c and the lower surface 25e of the outer extension 25 are in contact with each other. It approximates a height H4 of 25. That is, H3≈H4.

  The height of the bottom plate 81 of the rear reinforcing member 58 is set to a different height depending on the portion to which the inner and outer extensions 24 and 25 are attached. That is, it is set high at a position where the inner extension 24 is attached, and low at a position where the outer extension 25 is attached.

  The front reinforcing member 57 is a plate-like member that is slightly larger than the rear reinforcing member 58, and includes a plate-like bottom plate 91, an upper flange 92 that rises forward from the upper end of the bottom plate 91, and a bottom plate. The lower flange 94 is raised from the lower end of 91 toward the front.

  A plurality of (three) nuts 81 a for fastening the inner extension 24 to the rear reinforcing member 58 and a plurality (two) of fastening the outer extension 25 to the rear reinforcing member 58 are provided on the bottom plate 81 of the rear reinforcing member 58. Nut 81b is joined.

  A plurality of (three) holes 91a through which bolts for fastening the rear reinforcing member 58 and the inner extension 24 are passed and the rear reinforcing member 58 and the outer extension 25 are fastened to the bottom plate 91 of the front reinforcing member 57. A plurality of (two) holes 91b through which the bolts are passed are formed. In addition, a substantially rectangular opening 91 c is formed at a substantially central portion in the width direction of the bottom plate 91. A locking claw 91d is formed in the center of the opening 91c in the width direction by extending a part of the bottom plate 91 from the bottom to the top. Details of the locking claw 91d will be described later.

  The assembly of the vehicle body 11 will be described. First, the front and rear reinforcing members 57 and 58 are spot-welded to create the mounting plate 44.

  Next, the rear reinforcing member 58 is fitted into the front ends 24 a and 25 a of the inner and outer extensions 24 and 25. After the fitting, the inner and outer extensions 24 and 25 and the flanges 82 to 85 formed on the rear reinforcing member 58 are MIG welded.

  More specifically, the upper surface 24c of the inner extension 24 and the upper flange 82, the inner side surface 24d and the right flange 83, and the lower surface 24e and the lower flange 84 are welded. Three surfaces of the inner extension 24 are joined to the rear reinforcing member 58. Similarly, the upper surface 25c of the outer extension 25 and the upper flange 82, the outer surface 25f and the left flange 85, the lower surface 25e and the lower flange 84 are welded. Three sides of the outer extension 25 are joined to the rear reinforcing member 58.

  As shown in FIGS. 7 and 8, after the mounting plate 44 is mounted in front of the inner and outer extensions 24, 25, the bumper beam 17 is then mounted. A substantially rectangular opening 17 c is formed in the rear part of the bumper beam 17. When attaching the bumper beam 17, first, the bumper beam 17 is locked to the locking claw 91 d by aligning the position of the opening 17 c with the locking claw 91 d formed on the front reinforcing member 57. That is, the bumper beam 17 is temporarily fixed. There is no need to keep the bumper beam 17 down when the bumper beam 17 is attached, and the assembling work becomes easy.

  As shown in FIG. 9, the assembly work is completed by attaching the bumper beam 17 in a temporarily fixed state. The bolt attaching part 110 attached to the bumper beam 17 will be described in detail with reference to FIG.

  As shown in FIGS. 10 and 11, a bolt attachment portion 110 for attaching the eyebolt 100 is formed at the front portion of the bumper beam 17. The bolt mounting portion 110 is formed inward of the vehicle width with respect to the inner extension 24 and the mounting plate 44.

  The bolt mounting portion 110 is formed by mounting a bolt mounting plate 111, which is a substantially rectangular plate, to the bumper beam 17. The bolt attachment plate 111 is attached to the bumper beam 17 by two bolts 112 and 112. In the center of the bolt mounting plate 111, a bolt mounting hole 111a for fastening the eyebolt 100 is formed. The bolt mounting portion 110 is a towing portion that is towed by the eyebolt 100.

The effect of the present invention will be described with reference to FIG.
As shown in FIG. 12 (a), as indicated by a white arrow with respect to a narrow range (for example, the end portion 17a of the bumper beam 17 in the vehicle width direction) of the vehicle width outer end portion of the front portion of the vehicle. A so-called narrow offset collision may occur in which a collision load (front collision load) acts from the front. When a narrow offset collision occurs, the mounting plate 44 connects the left and right inner and front ends 24a, 25a of the outer extensions 24, 25, so the impact absorption performance in the longitudinal direction of the vehicle body by the inner and outer extensions 24, 25 is achieved. Will not be affected.

  On the other hand, as shown in FIG. 12 (b), the front ends 24 a and 25 a of the inner and outer extensions 24 and 25 are connected by a vertical plate-like mounting plate 44. For example, as indicated by an arrow, a load in the twisting direction may be applied to the outer extension 25. In this case, since the front end 25a of the outer extension 25 and the front end 24a of the inner extension 24 are connected by the mounting plate 44, the inner extension 24 and the mounting plate 44 relatively restrain the torsion of the outer extension 25. That is, the rigidity in the vicinity of the front end portion of the vehicle body, particularly the torsional rigidity can be increased. As a result, the steering stability of the vehicle can be improved. In this way, it is possible to improve the steering stability of the vehicle while ensuring the shock absorption performance in the longitudinal direction of the vehicle body against the narrow offset collision.

  5 and 6, the mounting plate 44 is composed of two front and rear reinforcing members 80 and 90. The upper flanges 82 and 92 extend from the upper end in the reverse direction to each other and the upper and lower flanges 82 and 92 from the lower end in the reverse direction from each other. And have lower flanges 84 and 94 respectively extending in the direction. By overlapping the two reinforcing members 80, 90 and extending the flanges 82, 84, 92, 94 from the upper and lower ends, the rigidity in the vicinity of the front end of the vehicle body, in particular, the torsional rigidity is further increased. Can do.

  In addition, the upper surface 24c, the inner side surface 24d, and the lower surface 24e of the inner extension 24 are joined to the flanges 82 to 84, respectively. By joining the three surfaces, the torsional rigidity can be further increased. The same applies to the outer extension 25. That is, the outer extension 25 has an upper surface 25c, an outer surface 25f, and a lower surface 25e joined to the flanges 82, 84, and 85, respectively. By joining the three surfaces, the torsional rigidity can be further increased.

  With reference to FIGS. 10 and 11, the bolt mounting portion 110 is formed inward of the mounting plate 44. A bolt mounting portion 110 is formed inside the vehicle width of the mounting plate 44 whose rigidity is increased. When the eyebolt 100 is attached to the bolt attaching portion 110 and the vehicle is towed, a reaction force against towing is applied to the bumper beam 17. The reaction force applied to the bumper beam 17 is transmitted to the inner and outer extensions 24 and 25 via the mounting plate 44. Due to the high rigidity of the mounting plate 44, the traction load can be reliably distributed over a wider range, and deformation of the bumper beam 17 and the like during traction can be suppressed.

  Although the vehicle body according to the present invention has been described by taking a passenger car as an example, it can be applied to other vehicle types and is not limited to these types.

  The vehicle body structure of the present invention is suitable for use in a vehicle body of a vehicle such as a passenger car.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Vehicle body, 15 ... Front side frame, 17 ... Bumper beam, 17c ... Opening, 21 ... Upper member, 24 ... Inner extension, 25 ... Outer extension, 44 ... Reinforcement member (mounting plate), 57 ... Front plate (Front reinforcing member), 58 ... rear plate (rear reinforcing member), 82 ... upper flange (for rear plate), 84 ... lower flange (for rear plate), 91d ... locking claw, 92 ... (for front plate) Flange, 94 ... lower flange (of front plate), 100 ... eye bolt, 110 ... bolt mounting portion.

Claims (4)

Left and right front side frames extending in the longitudinal direction of the vehicle body on the left and right sides of the front of the vehicle body
Left and right upper members extending forward and downward from the left and right front pillars on the outer side in the vehicle width direction and on the upper side of the left and right front side frames;
Left and right inner extensions extending forward from the front ends of the left and right front side frames;
In the vehicle body front part structure including left and right outer extensions extending forward from the front ends of the left and right upper members,
A left mounting plate provided across the front end of the left inner and outer extensions;
A right mounting plate provided between the front ends of the right inner and outer extensions;
A vehicle body front part structure having a bumper beam extending in the vehicle width direction and attached to the left and right attachment plates. The left and right mounting plates are each composed of at least two front and rear reinforcing members,
The two front left and right reinforcing members are overlapped and integrated with each other in the longitudinal direction of the vehicle body, and each has an upper flange extending from the upper end in the reverse direction to the front and the lower flanges extending from the lower end in the reverse direction to the front and rear. Each with
The two right and left reinforcing members are also overlapped and integrated with each other in the longitudinal direction of the vehicle body, and each has an upper flange extending from the upper end in the reverse direction to the front and the lower flange extending from the lower end in the reverse direction to the front and rear. Each has
The vehicle body front part structure according to claim 1. The left and right mounting plates are each composed of at least two front and rear reinforcing members that are overlapped and integrated with each other in the longitudinal direction of the vehicle body,
The left and right front reinforcing members have left and right locking claws extending forward of the vehicle body,
The vehicle body front part structure according to claim 1, wherein the bumper beam has left and right openings that can be hooked on the left and right engaging claws. The bumper beam has left and right bolt mounting portions for mounting left and right eyebolts on a portion inward of the vehicle width from the left and right inner extensions.
The vehicle body front part structure according to any one of claims 1 to 3, wherein the left and right bolt mounting portions are traction portions to be pulled by the left and right eyebolts.

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