JP2018043566A - Vehicle body front part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body front part structure that can make both productivity of a vehicle body front part structure and rigidity in a longitudinal direction and in a lateral direction compatible.SOLUTION: The vehicle body front part structure has: a suspension tower 3; a front side frame 4; an apron lane 6; a vertical member 21 that constitutes a closed cross section extending upward from the front side frame 4 in collaboration with a side wall part 3b, outside in a vehicle width direction of the side wall part 3b of the suspension tower 3; and a lateral member 22 hung between the vertical member 21 and the apron lane 6 and also provided with a first panel 23 separated forward from a front wall part 21e of the vertical member 21 and a second panel 24 with an approximately L-shape cross section. The first panel 23 is jointed to an upper end member provided near the upper end part of the suspension tower 3 and the side wall part 3b, and the second panel 24 is joined to the upper end member and the first panel 23 to form a space part in an approximately cuboid shape extending in the vehicle width direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a front body structure of a vehicle, and more particularly to a front body structure of a vehicle including a suspension tower, a front side frame, and an apron reinforcement.

Conventionally, a front vehicle body structure of a vehicle in which a front side frame disposed on the inner side in the vehicle width direction of the suspension tower and an apron reinforcement disposed on the outer side in the vehicle width direction of the suspension tower are connected by a reinforcing member. It is known.
This reinforcing member forms a closed cross-section in cooperation with the side wall of the partially cylindrical suspension tower, enhances the rigidity of the suspension tower in the vertical, front-rear and left-right directions, and the front load of the vehicle during a frontal collision of the vehicle When it is input to the side frame, part of it is transmitted to the apron reinforcement.

The vehicle body front structure disclosed in Patent Document 1 includes a rear apron panel provided between a suspension tower and a dash panel, and is erected from a front side frame behind the suspension tower and joined to the rear apron panel. A vertical branch brace that forms a closed cross section that extends to the top of the vertical branch brace is provided, and a deformation suppressing member that couples the vertical branch brace and the apron reinforcement is disposed.
Thereby, when a collision load is input to the apron reinforcement from the front due to a frontal collision of the vehicle, the apron reinforcement is prevented from being deformed outward in the vehicle width direction.

Japanese Patent Application Laid-Open No. 2012-166583

The vehicle body front structure disclosed in Patent Document 1 controls the deformation of the apron reinforcement due to a collision load at the time of a frontal collision, thereby suppressing a peeling phenomenon between the hinge pillar and the dash panel.
However, the technique of Patent Document 1 still has room for improvement in terms of improving the rigidity of the suspension tower in the vertical and front-rear and left-right directions.
That is, in the vehicle body front structure disclosed in Patent Document 1, a longitudinal branch brace that forms a closed cross-section curved in a rearward upward slope from the front side frame to the rear apron panel, an upper end side portion of the longitudinal branch brace, and an apron reinforcement Because it has a structure that has a deformation restraining member that connects the suspension, it does not have a laterally closed cross section that extends in the vehicle width direction that connects the longitudinal branch brace and the apron reinforcement, and the longitudinal and lateral rigidity of the suspension tower However, there is a possibility that it cannot be secured sufficiently.

In addition, a vertical closed cross section (vertical closed cross section) along the side wall of the suspension tower and a horizontal closed cross section (horizontal closed cross section) connecting the upper end side portion of the vertical closed cross section and the apron reinforcement are provided. The vertical closed cross section mainly contributes to the vertical rigidity and the horizontal closed cross section mainly contributes to the front and rear and left and right rigidity. In the structure, it is not easy to achieve both productivity and rigidity in the front-rear and left-right directions.
That is, in the case of a horizontal closed cross section with the same specifications as the vertical closed cross section that can ensure the vertical rigidity, the front and rear and left and right lateral rigidity is insufficient, and the same as the horizontal closed cross section that can ensure the front and rear and left and right rigidity. In the case of the vertical closed cross section of the specification, although the vertical rigidity can be ensured more than necessary, the configuration of the vertical closed cross section increases in size, which may increase the weight and cost.

  An object of the present invention is to provide a front body structure of a vehicle that can achieve both the productivity of the front body structure and the rigidity in the front-rear and left-right directions.

  The front body structure of a vehicle according to claim 1 includes a suspension tower formed so as to bulge into an engine room of the vehicle, a front side frame disposed on the inner side in the vehicle width direction of the suspension tower, and the suspension. A front body structure of a vehicle having an apron reinforcement disposed on the outer side in the vehicle width direction of the tower, wherein the front side is cooperated with the side wall portion on the outer side in the vehicle width direction on the side wall portion of the suspension tower. A vertical member that forms a closed cross section extending upward from the frame, and a first panel that is suspended between the vertical member and the apron reinforcement and spaced forward from the front wall portion of the vertical member, and a substantially L-shaped cross section And an upper end member provided in the vicinity of the upper end portion of the suspension tower. Wherein is joined to a side wall portion, the second panel is characterized in that to form a substantially rectangular parallelepiped space that is joined to extend in the vehicle width direction and the first panel and the top member.

In this vehicle front body structure, the suspension tower has a vertical member that forms a closed cross section extending upward from the front side frame in cooperation with the side wall portion on the vehicle width direction outside of the side wall portion of the suspension tower. The rigidity in the vertical direction can be ensured.
A transverse member comprising a first panel suspended between the longitudinal member and the apron reinforcement and spaced forward from a front wall portion of the longitudinal member; and a second panel having a substantially L-shaped cross section. The first panel is joined to the upper end member and the side wall provided near the upper end of the suspension tower, and the second panel is joined to the upper end member and the first panel in the vehicle width direction. Since the substantially rectangular parallelepiped space is formed, the area of the quasi-closed cross section by the horizontal member that contributes to the longitudinal and lateral stiffness without affecting the productivity is vertically closed by the vertical member that contributes to the vertical stiffness. It can be larger than the area of the cross section.

According to a second aspect of the present invention, in the first aspect of the invention, the first panel has a first lower flange portion extending downward, and the second panel extends downward, and a second lower flange portion and a second inner flange portion. The longitudinal member has a vehicle width direction outer side portion of the first lower flange portion joined to the second lower flange portion, and a vehicle width direction inner side portion of the first lower flange portion joined to the side wall portion. The second inner flange portion is joined to the lateral wall portion of the vertical member.
According to this configuration, the area of the horizontal closed cross section by the horizontal member can be made larger than the area of the vertical closed cross section by the vertical member with a simple configuration.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the upper end member includes a top portion of the suspension tower and an apron set connected to the top portion, and the first panel extends upward. 1 upper flange portion, the second panel has a second upper flange portion extending rearward from the upper end portion, the first upper flange portion is joined to the top portion, and the second upper flange portion is It is characterized by being joined to an apron gusset.
According to this structure, a vertical member can be joined to an upper end member via the 1st, 2nd panel, and productivity can be improved.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a bead portion that protrudes in the front-rear direction and extends in the vehicle width direction is formed on the first panel.
According to this configuration, the rigidity of the transverse member in the front-rear and left-right directions can be further increased.

  According to the front vehicle body structure of the vehicle of the present invention, it is possible to achieve both the productivity of the front vehicle body structure and the rigidity in the front-rear and left-right directions.

It is a top view of the front part vehicle body structure of the vehicle which concerns on Example 1 of this invention. It is a side view. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the perspective view which looked at the inner side of the suspension tower from the front lower side. It is the perspective view which looked at the inner side of a suspension tower from the back lower part. It is a disassembled perspective view of a reinforcement member. It is the perspective view which looked at the reinforcement member from diagonally upward. It is a front view which shows the modification of a 1st panel.

Hereinafter, modes for carrying out the present invention will be described based on examples.
The following description exemplifies the application of the present invention to the front body structure of a vehicle, and does not limit the present invention, its application, or its use.
In the figure, the direction of arrow F is the front, the direction of arrow L is the left, and the direction of arrow U is the top.

Embodiment 1 of the present invention will be described below with reference to FIGS.
First, the premise structure of the vehicle V is demonstrated.
As shown in FIGS. 1 and 2, the vehicle V includes a pair of left and right hinge pillars 1.
The pair of hinge pillars 1 joins a pillar inner and a pillar outer to form a closed cross section extending vertically.
A dash panel 2 is provided between the pair of hinge pillars 1 and partitions the engine room E and the vehicle compartment R back and forth.

A pair of left and right suspension towers (hereinafter abbreviated as suspension towers) 3 are disposed at positions spaced forward from the dash panel 2. Each of the pair of suspension towers 3 includes an annular top portion 3a, a partially cylindrical side wall portion 3b, and the like.
A front suspension (not shown) is mounted on each pair of suspension towers 3.
The front suspension includes a wheel support that rotatably supports a front wheel, an upper arm and a lower arm that are spaced apart from each other, a shock absorber, and the like (all not shown).
Since the vehicle V has a left-right symmetrical structure, the right-side structure will be mainly described below.

As shown in FIGS. 1 to 3, 6, and 7, a front side frame 4 is disposed on the left side (in the vehicle width direction) of the suspension tower 3.
The front side frame 4 is formed of an inner panel and an outer panel having a hat-shaped cross section, and forms a closed cross section having a substantially rectangular cross section extending in the front-rear direction to the right end portion of the engine room E by both panels.
The middle part of the front side frame 4 is joined to the lower part of the side wall part 3 b of the suspension tower 3. The rear end portion of the front side frame 4 is joined to the front portion of the dash panel 2 by welding and is formed so as to be continuous with the front end side portion of the floor frame.
A crash can (not shown) is attached to the front end of the front side frame 4 via a set plate 5. The crash can is configured to be able to absorb an impact load by axial compression deformation at the time of collision.

As shown in FIGS. 1 to 3 and 5, an apron reinforcement (hereinafter abbreviated as apron rain) 6 is disposed on the right side (the vehicle width direction outer side) of the suspension tower 3.
The apron rain 6 is formed of an inner panel and an outer panel, and constitutes a substantially rectangular closed cross section that extends forward and backward on the right side of the front side frame 4 by both panels.
The middle part of the apron rain 6 is connected to the upper end part of the side wall part 3b of the suspension tower 3, and the rear end part is joined to the upper part of the hinge pillar 1 by welding. The tip of the apron rain 6 is connected to the set plate 5.
The lower part of the apron rain 6 and the upper part of the front side frame 4 are connected by a plate-shaped wheel apron 7.

As shown in FIGS. 1, 2, 4 and 7, there are a cowl front panel (hereinafter abbreviated as “cowl front”) 8 and a cowl reinforcement (hereinafter abbreviated as “cowl rain”) 9 at the rear of the suspension tower 3. An apron gusset 10 and the like are disposed.
The cowl front 8 and the cowl rain 9 are each formed in a substantially Z-shaped cross section.
The front end portion of the cowl front 8 and the cowl rain 9 are fastened and fixed to the top portion 3a via bolts. The cowl front 8 and the cowl rain 9 form an open box type cowl box extending in the vehicle width direction in cooperation with the cowl panel and the dash panel 2 and a support portion for a front window glass (not shown). Yes.

The apron gusset 10 has a substantially horizontal plate shape.
The apron gusset 10 has a front end portion fastened and fixed to the top portion 3a via a bolt, a rear end portion fixed to the dash panel 2, and a left end portion connected to the right end portion of the cowl front 8 and the cowl rain 9 via a bolt. Fastened and fixed, and the right end portion is fixed to the apron rain 6. Therefore, as shown in FIG. 4, the cowl front 8, the cowl rain 9, and the apron gusset 10 form a closed cross section having a substantially triangular cross section extending in the left and right directions in cooperation with the top portion 3a.
Here, the top portion 3 a and the apron set 10 correspond to the upper end member provided in the vicinity of the upper end portion of the suspension tower 3.

Next, the reinforcing member 20 provided in the suspension tower 3 will be described.
The reinforcing member 20 is disposed inside the suspension tower 3 (outside in the vehicle width direction), and is formed so as to increase the rigidity of the suspension tower 3 in the vertical direction, the front-rear direction, and the lateral direction.
As shown in FIGS. 2 to 9, the reinforcing member 20 includes a vertical member 21 having a generally hat-shaped cross section extending vertically and a horizontal member 22 having a substantially U-shaped cross section extending horizontally.

The vertical member 21 will be described.
As shown in FIGS. 2, 3, 5 to 9, the vertical member 21 has a vertical closed section extending substantially vertically upward from the front side frame 4 in cooperation with the side wall 3 b at the right rear portion of the side wall 3 b. It is composed. The vertical member 21 includes a main body portion 21a having a substantially U-shaped cross section, a front flange portion 21b projecting forward from the front end of the main body portion 21a, and a rear flange portion 21c projecting rearward from the rear end of the main body portion 21a. And.

The main body 21a has a lower end joined to the upper end of the front side frame 4 by welding, and the upper end extends to a position near the top 3a slightly below.
The main body portion 21a connects the front wall portion 21e and the rear wall portion that are substantially orthogonal to the front-rear direction, and the right end portion (the vehicle width direction outer end portion) of the front wall portion 21e and the rear wall portion, and is substantially orthogonal to the left-right direction. And a horizontal wall portion 21d. At the same height position, the front wall portion 21e is set so that the left-right dimension is larger than the rear wall portion, and the front wall portion 21e is set so that the left-right dimension is larger toward the upper side. As a result, a vertically closed cross section having a so-called section modulus that extends substantially vertically upward while avoiding interference with the tire and the suspension mechanism is formed.
The front flange portion 21b is joined to the upper end portion of the front side frame 4 and the side wall portion 3b by welding, and the rear flange portion 21c is joined to the upper end portion of the front side frame 4 and the wheel apron 7 by welding.

Next, the lateral member 22 will be described.
As shown in FIGS. 3, 4, 6 to 9, the lateral member 22 forms a laterally closed cross section extending from the longitudinal member 21 to the left and right in cooperation with the apron gusset 10 at the right rear portion of the side wall portion 3 b. Yes.
The lateral member 22 includes a flat plate-like first panel 23 and a second panel 24 having a substantially L-shaped cross section.

  As shown in FIG. 9, the first panel 23 is disposed at a position where the upper end of the first panel 23 is higher than the upper end of the main body 21 a and is separated from the front wall 21 e of the main body 21 a by a small distance forward. Has been. The first panel 23 includes a first upper flange portion 23a projecting upward from the upper end portion, a first lower flange portion 23b projecting downward from the lower end portion, and a right end portion (outward in the vehicle width direction). The first outer flange portion 23c and the first inner flange portion 23d projecting from the left end portion to the left side (in the vehicle width direction) are provided.

As shown in FIGS. 3 and 4, the first upper flange portion 23a is formed with three joint portions 23p that are recessed backward from the left end side portion in order, and these joint portions 23p are formed on the top portion 3a. It is joined to the rear vertical wall by welding. The first lower flange portion 23b is formed with three joint portions 23q that are recessed backward from the right end portion in order, and these joint portions 23q are joined to a second flange portion 24b described later by welding. Yes.
Further, the first lower flange portion 23b has a recess 23e recessed in the rear side extending in the vehicle width direction at least at a portion facing the front wall portion 21e of the vertical member 21.
In this manner, the first panel 23 is separated forward from the front wall portion 21e of the vertical member 21 by forming a plurality of joint portions 23p and a plurality of joint portions 23q in the recessed portion on the rear side.
Further, since the concave portion 23e extends in the vehicle width direction at the portion facing the front wall portion 21e of the vertical member 21, a convex portion extending in the left and right direction is formed in the middle step portion of the first panel 23, and the bead effect is obtained. Secured.
In addition, it is more preferable from a viewpoint of a rigidity improvement to provide the 1st upper flange part 23a also in the site | part facing the front wall part 21e of the vertical member 21 similarly to the recessed part 23e.
The first outer flange portion 23c is joined to the left side wall portion of the apron rain 6, and the first inner flange portion 23d is joined to the side wall portion 3b by welding via the front flange portion 21b.

  As shown in FIGS. 8 and 9, the second panel 24 includes a second upper flange portion 24a projecting from the upper end of the vertical wall portion to the rear side, and a second lower flange projecting downward from the front end of the horizontal wall portion. Portion 24b, second outer flange portion 24c projecting downward from the right end of the horizontal wall portion, second inner flange portion 24d projecting downward from the left end of the horizontal wall portion, and rear side from the right end of the vertical wall portion A second upper outer flange portion 24e projecting from the left end of the vertical wall portion and a second upper inner flange portion 24f projecting rearward from the left end of the vertical wall portion.

As shown in FIG. 4, the second upper flange portion 24a is joined to the rear end portion of the apron gusset 10 by welding, and the second lower flange portion 24b is composed of three joint portions 23q of the first lower flange portion 23b. Are joined by welding. The second outer flange portion 24 c and the second upper outer flange portion 24 e are joined to the left side wall portion of the apron rain 6.
As shown in FIGS. 6 and 7, the second inner flange portion 24 d is joined to the horizontal wall portion 21 d of the vertical member 21 by welding. The second upper inner flange portion 24f is joined to the wheel apron 7 via the rear flange portion 21c.

As described above, as shown in FIG. 4, the first panel 23, the second panel 24, and the apron gusset 10 cooperate to form a laterally closed cross section having a rectangular cross section extending left and right on the rear side of the top portion 3a. Yes. Therefore, this laterally closed cross section is formed so as to continue to the lower rear side of the triangular closed cross section formed by the cowl front 8, the cowl rain 9, and the apron gusset 10, and both closed cross sections complement each rigidity. .
Further, as shown in FIG. 5, the first panel 23 is separated from the front wall portion 21e of the main body 21a by a small distance forward, so that the first panel 23 and the vertical member 21 overlap in front view. Then, the horizontal member 22 can constitute a substantially closed cross section that is larger in the longitudinal dimension than the vertical closed cross section formed by the vertical member 21 in the region and extends in the vehicle width direction and is connected to the suspension tower 3.

Next, operations and effects in the front vehicle body structure of the vehicle V of the present embodiment will be described.
The front vehicle body structure of the vehicle V includes a vertical member 21 that forms a vertical closed section extending upward from the front side frame 4 in cooperation with the side wall 3b on the outer side in the vehicle width direction of the side wall 3b of the suspension tower 3. The rigidity in the vertical direction of the suspension tower 3 can be ensured.
A transverse member 22 having a first panel 23 suspended between the longitudinal member 21 and the apron rain 6 and spaced forward from the front wall 21e of the longitudinal member 21 and a second panel 24 having a substantially L-shaped cross section. The first panel 23 is joined to the upper end member provided in the vicinity of the upper end portion of the suspension tower 3 and the side wall portion 3b, and the second panel 24 is joined to the upper end member and the first panel 23 in the vehicle width direction. Since the extending substantially rectangular parallelepiped space portion is formed, the area of the pseudo laterally closed cross section by the horizontal member 22 that contributes to the longitudinal and lateral rigidity without affecting the productivity, the vertical by the vertical member that contributes to the vertical rigidity. The area can be larger than the area of the closed cross section.

  The first panel 23 has a first lower flange portion 23b that extends downward, and the second panel 24 has a second lower flange portion 24b and a second inner flange portion 24d that extend downward. The front portion of the vertical member 21 in which the outer portion in the vehicle width direction is joined to the second lower flange portion 24b and the first inner flange portion 23d corresponding to the inner portion in the vehicle width direction of the first lower flange portion 23b is joined to the side wall portion 3b. The second inner flange portion 24d is joined to the flange portion 21b, and the second inner flange portion 24d is joined to the lateral wall portion 21d of the longitudinal member 21. Thereby, the area of the horizontal closed section by the horizontal member 22 can be made larger than the area of the vertical closed section by the vertical member 21 with a simple configuration.

  The upper end member has a top portion 3a of the suspension tower 3 and an apron set 10 connected to the top portion 3a, the first panel 23 has a first upper flange portion 23a extending upward, and the second panel 24 has an upper end portion. The first upper flange portion 23a is joined to the top portion 3a, and the second upper flange portion 24a is joined to the apron gusset 10. Thereby, the vertical member 21 can be joined to an upper end member via the 1st, 2nd panels 23 and 24, and productivity can be improved.

Next, a modification in which the above embodiment is partially changed will be described.
1) In the above-described embodiment, the example in which the bead effect is ensured by forming a plurality of joint portions 23p and joint portions 23q on the first panel 23 of the lateral member 22 has been described. It may be formed.
As shown in FIG. 10, the first panel 23A includes a first upper flange portion 23a projecting upward from the upper end portion, a first lower flange portion 23b projecting downward from the lower end portion, and a right end portion projecting to the right side. The first outer flange portion 23c, the first inner flange portion 23d projecting to the left from the left end portion, a bead portion 23s that protrudes to the front side and extends to the left and right at the middle step portion, and the like. The three joints 23p are formed above the bead part 23s, and the three joints 23q are formed below the bead part 23s. The bead portion 23s may be a bead recessed in the rear side.
Thereby, the rigidity of the transverse member 22 in the front-rear and left-right directions can be further increased.

2) In the above embodiment, the upper end member has been described as an example of the top portion and the apron gusset, but any member having a horizontal portion and a vertical portion in the structure around the suspension tower may be used. Or only the top part.

3) In the above embodiment, the example has been described in which the upper end of the vertical member is extended to a position near the top of the suspension tower, but the upper end of the vertical member is extended upward. You may join to a top part.

4) In the above-described embodiment, the example in which the first panel is completely separated from the front wall portion of the vertical member has been described. However, a vertical member other than the region is formed in a portion where the first panel and the vertical member overlap. It suffices if a pseudo closed section having a longitudinal dimension larger than that of the vertical closed section can be formed, and the first panel and the front wall of the vertical member are partially formed by forming a part of the first panel protruding to the vertical member side. You may join.

5) In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

V Vehicle E Engine room 3 Suspension tower 3a Top part 3b Side wall part 4 Front side frame 6 Apron rain 10 Apron gusset 20 Reinforcement member 21 Vertical member 21b Front flange part 21d Horizontal wall part 21e Front wall part 22 Horizontal member 23 First panel 23a First Upper flange portion 23b First lower flange portion 23s Bead portion 24 Second panel 24a Second upper flange portion 24b Second lower flange portion 24d Second inner flange portion

Claims (4)

A suspension tower formed so as to swell in the engine room of the vehicle, a front side frame disposed on the inner side in the vehicle width direction of the suspension tower, and an apron disposed on the outer side in the vehicle width direction of the suspension tower In the front body structure of a vehicle with reinforcements,
A vertical member constituting a closed cross section extending upward from the front side frame in cooperation with the side wall portion on the vehicle width direction outer side of the side wall portion of the suspension tower;
A transverse member having a first panel suspended between the longitudinal member and the apron reinforcement and spaced forward from a front wall of the longitudinal member; and a second panel having a substantially L-shaped cross section. And
The first panel is joined to an upper end member provided in the vicinity of the upper end portion of the suspension tower and the side wall portion,
A front vehicle body structure of a vehicle, wherein the second panel is joined to the upper end member and the first panel to form a substantially rectangular parallelepiped space extending in the vehicle width direction. The first panel has a first lower flange portion extending downward;
The second panel has a second lower flange portion and a second inner flange portion extending downward;
A vehicle width direction outer side portion of the first lower flange portion is joined to the second lower flange portion,
The vehicle width direction inner side part of the first lower flange part is joined to the front flange part of the vertical member joined to the side wall part,
The front body structure of a vehicle according to claim 1, wherein the second inner flange portion is joined to a lateral wall portion of the vertical member. The upper end member has a top portion of the suspension tower and an apron set connected to the top portion;
The first panel has a first upper flange portion extending upward;
The second panel has a second upper flange portion extending rearward from the upper end portion;
The first upper flange portion is joined to the top portion;
The vehicle front body structure according to claim 1 or 2, wherein the second upper flange portion is joined to the apron gusset.   The front body structure of a vehicle according to any one of claims 1 to 3, wherein a bead portion protruding in the front-rear direction and extending in the vehicle width direction is formed on the first panel.