JP3654207B2 - Auto body front structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body front structure.
[0002]
[Prior art]
As a conventional vehicle body front structure, for example, as shown in Japanese Patent Laid-Open No. 4-50084, the substantially second half of the front side member is offset in the vehicle width direction from the subframe disposed below the front side member. What is provided is known.
[0003]
[Problems to be solved by the invention]
Since the front side member is bent in the vehicle width direction from the middle, a bending moment acts on the bent portion of the front side member in the vehicle width direction at the time of a frontal collision of the vehicle, and bending deformation easily occurs. There is a possibility that the direction is not properly deformed.
[0004]
In addition, when the cabin rotates to the non-collision side during a frontal collision of the vehicle, a bending moment acts on the front side member and the sub frame in the vehicle width direction, causing bending deformation. Axial crushing deformation may be hindered.
[0005]
Therefore, the present invention can prevent the front side member from being bent in the vehicle width direction at the time of a full wrap frontal collision of the vehicle, and of course the vehicle width of the front side member even when the cabin is rotated in the non-collision direction at the time of offset frontal collision. It is an object of the present invention to provide a front body structure of an automobile that can avoid the bending deformation of the direction and can appropriately perform the axial deformation of the front side member.
[0006]
[Means for Solving the Problems]
In the invention of claim 1, the front surface of the vertical wall of the dash panel is formed at the rear end portion of the front side member that is formed in a closed cross section and is arranged in the vehicle longitudinal direction on both sides in the vehicle width direction of the power unit mounting room. In the structure provided with an extension part with a closed cross-section joined to the bottom of the toe board
The front end portion of the side sill in which the extension portion is bent from the rear end of the front side member in the plan view, sharing the outer wall toward the outer side in the vehicle width direction, and the rear end is arranged to extend in the vehicle body front-rear direction on the floor side. and the outrigger portion bonded butt,
And a projecting part that projects inward in the vehicle width direction from the rear end of the front side member,
The outer and inner side walls of the outrigger portion and the front side member are set to have substantially the same width, and the inner side wall of the outrigger portion and the inner side wall of the front side member are spaced apart at an appropriate interval in the front-rear direction. The discontinuous portion is set as a fragile portion, and when the fragile portion is crushed and deformed by an axial input acting on the front side member, the rear end of the inner side wall of the front side member and the inside of the outrigger portion It is characterized by the fact that it abuts against the front edge of the wall .
[0007]
In the invention of claim 2, the toe board of the dash panel according to claim 1 is formed in a closed cross section extending in the vehicle width direction, and the rear end of the front side member is positioned at the upper end position of the toe board in the vertical direction of the dash panel. with binding against the wall, the lower wall of the toe board, and characterized by providing an easily collapsible portion to encourage bending downward to the toe board at the input of the frontal collision of the vehicles.
[0009]
【The invention's effect】
According to the first aspect of the present invention, the front side member is formed in a straight shape and its rear end is joined to the front surface of the vertical wall of the dash panel, and the extension portion has its outrigger portion and overhang portion at the toe board. Since it is joined to the lower surface and the rear end of the outrigger is connected to the front end of the side sill, load is transmitted to the dash panel and the side sill against a full lap front collision of the vehicle, resulting in a high crushing reaction force. As a result, the front side member can be appropriately crushed and deformed in the axial direction without bending deformation in the vehicle width direction, and the collision energy can be efficiently absorbed.
[0010]
In addition, the front side member and the outrigger portion are formed to have substantially the same width in plan view with respect to the offset frontal collision of the vehicle, and the outer wall of the front side member and the outer wall of the outrigger portion are continuous. On the other hand, the inner side wall of the front side member and the inner side wall of the outrigger portion are separated at an appropriate interval in the front-rear direction to be discontinuous, and the discontinuous portion is used as a weak portion. By crushing, the bending load in the vehicle width direction acting on the front side member when the cabin rotates in the non-collision direction is absorbed, and the bending deformation of the front side member in the vehicle width direction is avoided.
[0011]
Then, as the crushing deformation of the fragile portion proceeds and the rear end of the inner side wall of the front side member and the front end of the inner side wall of the outrigger portion abut, the front side member and the outrigger portion are substantially linear in plan view. The collision input can be transmitted to the side sill as an axial force and a high crushing reaction force can be generated. Therefore, even during this offset frontal collision, the front side member is properly crushed and deformed in the axial direction, making the collision energy efficient. Can absorb well.
[0012]
According to the invention described in claim 2, in addition to the effect of the invention of claim 1, since that is increase the rigidity by forming a closed cross section extending the toe board of the dash panel in the vehicle width direction, during a frontal collision of the vehicle As a result, the load transmission to the dash panel and the side sill of the collision input at the can be enhanced, and a high crushing reaction force can be generated at the front side member.
[0013]
In addition , it is possible to urge the toe board to bend and bend downward from the easy crushing part of the lower wall at the time of frontal collision of the vehicle, so that the rear end of the front side member and the rear end of the extension part at the time of frontal collision of the vehicle And the vertical offset of the front side member, the toe board can be restrained from being deformed and moved in the interior of the vehicle interior with the rear end as a fulcrum, and the front side member is bent in the vertical direction. Deformation can be suppressed and the axial deformation can be more reliably performed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
1 and 2, reference numeral 1 denotes a dash panel that separates the power unit mounting room 5 and the cabin 6, and a toe board 3 tilted forward is formed on the lower side of the vertical wall 2, and the rear end of the toe board 3 is attached to the dash panel. Connected to the floor panel 4.
[0016]
In the present embodiment, the toe board 3 is extruded and formed in a closed cross section extending in the vehicle width direction with a lightweight metal material such as aluminum metal.
[0017]
7 is a front side member constituting a front skeleton member of the vehicle body, which is joined to a hood ridge panel (not shown) constituting the side wall in the vehicle width direction of the power unit mounting room 5 and arranged in a straight shape in the vehicle longitudinal direction. The front side member 7 is provided with an extension portion 8 that extends from the front surface of the vertical wall 2 of the dash panel 1 to the lower surface of the toe board 3 at its rear end.
[0018]
Both the front side member 7 and its extension part 8 are formed in a closed cross section, the rear end of the front side member 7 is butted against the front surface of the vertical wall 2 of the dash panel 1, and the extension part 8 is It is joined from the front surface of the vertical wall 2 to the lower surface of the toe board 3.
[0019]
Here, the extension portion 8 is bent from the rear end of the front side member 7 toward the outside in the vehicle width direction in plan view, and the rear end of the extension portion 8 is mounted on the side sill 9 of the floor side, that is, on the side of the floor panel 4. An outrigger portion 10 coupled to a front end portion of a side sill 9 constituting a floor side longitudinal skeleton member extending in the front-rear direction, and an overhang portion 11 projecting inward in the vehicle width direction from the rear end of the front side member 7 It is composed.
[0020]
The outrigger portion 10 shares the outer wall with the front side member 7, that is, the outer wall 7 a of the front side member 7 and the outer wall 10 a of the outrigger portion 10 are continuously formed. The distance between the outer wall 10 a and the inner wall 10 b is set to be substantially the same as the distance between the outer wall 7 a and the inner wall 7 b of the front side member 7.
[0021]
Also, the front Symbol inner wall 7b of the inner wall 10b and the front side members 7 of the outrigger portion 10, and discontinuously formed spaced at appropriate intervals in the longitudinal direction, the side wall 10b, 7b of The discontinuous part is the weak part 12.
[0022]
In the present embodiment, the projecting portion 11 is formed in a straight shape in the front-rear direction that is offset and connected to the inner side in the vehicle width direction of the outrigger portion 10 via the fragile portion 12 in plan view.
[0023]
According to the structure of the above embodiment, the front side member 7 is formed in a straight shape, and its rear end is joined to the front surface of the vertical wall 2 of the dash panel 1, and the extension portion 8 includes the outrigger portion 10 and Since the overhanging portion 11 is joined to the lower surface of the toe board 3 and the rear end portion of the outrigger portion 10 is joined to the front end portion of the side sill 9, it is shown in FIGS. As described above, a high crushing reaction force is obtained by transmitting a load to the dash panel 1 and the side sill 9 through the outrigger portion 10 and the overhanging portion 11, and the front side member 7 can be moved in the axial direction without bending deformation in the vehicle width direction. It can be appropriately crushed and deformed to efficiently absorb the collision energy.
[0024]
Further, with respect to the offset frontal collision of the vehicle, the front side member 7 and the outrigger portion 10 are formed to have substantially the same width in plan view, and the outer side wall 7a of the front side member 7 and the outer side of the outrigger portion 10 are formed. While the wall 10a is continuous, the inner side wall 7b of the front side member 7 and the inner side wall 10b of the outrigger portion 10 are discontinuous, and the discontinuous portion is the weakened portion 12. When the portion 12 is crushed, the bending load in the vehicle width direction acting on the front side member 7 when the cabin 6 rotates in the non-collision direction is absorbed, and the front side member 7 is bent and deformed in the vehicle width direction. Avoided.
[0025]
The crushing deformation of the fragile portion 12 proceeds and the rear end of the inner side wall 7b of the front side member 7 and the front end of the inner side wall 10b of the outrigger portion 10 come into contact with each other. 3, the collision input can be transmitted as an axial force to the side sill 9 to generate a high crushing reaction force as indicated by the arrow in FIG. In addition, the front side member 7 can be appropriately crushed and deformed in the axial direction to efficiently absorb the collision energy.
[0026]
In particular the toe board 3 as described above, in this embodiment, since that is formed in closed cross section extending in the vehicle width direction with a light metal material such as aluminum alloy, the toe board 3 rigidity of itself rather high, A Utoriga portion 10 is joined The rigidity of the arranged end portion is maintained high and the outrigger portion 10 is connected to the side sill 9. Therefore, the load transmission property to the dash panel 1 and the side sill 9 of the collision input at the time of the frontal collision of the vehicle is enhanced. A high crushing reaction force can be generated in the front side member 7.
[0027]
FIG. 4 shows a second embodiment of the present invention. In this embodiment, an input at the time of a frontal collision of a vehicle is applied to the lower wall 3b of the toe board 3 having a closed cross-sectional structure in the first embodiment. The toe board 3 is partially provided with an easy crushing portion 13 that promotes downward bending deformation.
[0028]
The easy crushing portion 13 has the lower wall 3b partially made thinner than the upper wall 3a, or a reinforcing material is attached to the upper wall 3a to make a difference in strength, or the lower wall 3b is partially It can be configured by providing a bent bead, and in this embodiment, a structure having a bent bead is shown as an example.
[0029]
Therefore, according to the structure of the second embodiment, the same effect as that of the first embodiment can be obtained, and the downward direction starting from the easy crushing portion 13 of the lower wall 3b with respect to the toe board 3 at the time of a frontal collision of the vehicle. Since bending deformation can be urged, the toe board 3 is moved rearward as a whole due to the fact that the rear end of the front side member 7 and the rear end of the extension portion 8 are offset in the vertical direction during the frontal collision. It is possible to suppress the deformation and movement of the front side member 7 with rotation using the end portion as a fulcrum, and to prevent the front side member 7 from being bent in the vertical direction, and to more reliably perform the axial deformation.
[0030]
In the above-described embodiment, the outrigger portion 10 and the overhang portion 11 of the extension portion 8 are formed to be bifurcated and offset in the vehicle width direction in plan view. It can also be configured as shown in FIG.
[0031]
In the third embodiment shown in FIG. 5, the outer wall of the front side member 7 is arranged such that the extension portion 8 has a part of the outer end wall of the vehicle width direction as the outer wall 10 a of the outrigger portion 10. 7a has a closed cross-sectional structure extending in the vehicle width direction with respect to the rear end of the front side member 7 from the rear end of the side sill 9 to the front end of the side sill 9. 14 is formed in parallel with the oblique end wall, the rib wall 14 is used as the inner wall 10b, and the oblique end wall is used as the outer wall 10a. A region on the inner side in the vehicle width direction of the outrigger portion 10 is defined as an overhang portion 11.
[0032]
A front end portion of the rib wall 14 is spaced apart from a rear end of the inner wall 7b of the front side member 7 at an appropriate interval to form a fragile portion 12, and in this embodiment, the rib wall 14 A front end extends from the fragile portion 12 in parallel with the front wall of the overhang portion 11.
[0033]
Therefore, the structure of the third embodiment can provide the same effects as those of the first embodiment. In particular, in this embodiment, the outrigger portion 10 and the overhang portion 11 are branched in the vehicle width direction in plan view. Therefore, the reaction force of the front side member 7 at the time of a full wrap frontal collision can be generated more reliably.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a first embodiment of the present invention.
FIG. 2 is a schematic side view of the first embodiment of the present invention.
FIG. 3 is a schematic plan explanatory view showing a deformation state at the time of an offset frontal collision according to the first embodiment of the present invention.
FIG. 4 is a schematic side view illustrating a second embodiment of the present invention.
FIG. 5 is a schematic plan view illustrating a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dash panel 2 Vertical wall 3 Toe board 3b Lower wall 5 Power unit mounting room 6 Cabin 7 Front side member 7a Outer side wall 7b Inner side wall 8 Extension part 9 Side sill 10 Outrigger part 10a Outer side wall 10b Inner side wall 11 Overhang part 12 Fragile part 13 Easy crush Part

Claims (2)

Joined to the rear end of the front side member that is formed in a closed cross section and arranged in a straight line in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the power unit mounting room. In a structure with an extension part with a closed section,
The front end portion of the side sill in which the extension portion is bent from the rear end of the front side member in the plan view, sharing the outer wall toward the outer side in the vehicle width direction, and the rear end is arranged to extend in the vehicle body front-rear direction on the floor side. and the outrigger portion bonded butt,
And a projecting part that projects inward in the vehicle width direction from the rear end of the front side member,
The outer and inner side walls of the outrigger portion and the front side member are set to have substantially the same width, and the inner side wall of the outrigger portion and the inner side wall of the front side member are spaced apart at an appropriate interval in the front-rear direction. The discontinuous portion is set as a fragile portion, and when the fragile portion is crushed and deformed by an axial input acting on the front side member, the rear end of the inner side wall of the front side member and the inside of the outrigger portion An automobile body front structure characterized in that the front end of the wall abuts . Forming a closed cross section extending the toe board of the dash panel in the vehicle width direction, the rear end of the front side members with binding against the vertical wall of the dash panel at the upper end position of the toe board, the bottom wall of the toe board, car 2. The front body structure of an automobile according to claim 1 , wherein an easy crushing portion is provided on the toe board to bend downward in response to an input at the time of both frontal collisions.

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