JP4747134B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure in which an upper member is provided on the outer upper side of a front side frame, and the front side frame and the upper member are coupled to a dashboard lower.

As the vehicle body front structure, the front side frame and the upper member are connected by a connecting member, a support bracket is bolted to the vertical part of the connecting member and the vertical wall of the front side frame, and the engine / transmission unit is supported by the support bracket. Things are known.
According to this vehicle body front structure, the strength of the vehicle body front structure can be increased by providing a connecting member (see, for example, Patent Document 1).
JP 2005-112175 A

By the way, the front side frame of the front structure of the vehicle body is configured to absorb an impact by being deformed when an impact is applied from the front of the vehicle body.
The rear end portion of the front side frame is supported by an outrigger. The outrigger extends downward from the rear end of the front side frame toward the rear of the vehicle body.

For this reason, when an impact acts on the front end portion of the front side frame, a load acts on the upper end portion of the outrigger, and the outrigger may be tilted rearward of the vehicle body.
Since the outrigger tilts toward the rear of the vehicle body, the rear end portion of the front side frame may be lifted upward.

This phenomenon is likely to occur when the distance between the rear end portion of the front side frame and the wheel house is large.
As described above, since the rear end portion of the front side frame is lifted upward, it is difficult to better deform the front side frame and absorb the shock more appropriately.

  It is an object of the present invention to provide a vehicle body front structure that can deform a front side frame satisfactorily and absorb a shock more suitably.

According to the first aspect of the present invention, the front side frame extends in the longitudinal direction of the vehicle body, and an upper member is provided on the outer upper side of the front side frame, and the front side frame and the upper member are connected to the dashboard lower. A vehicle body that is coupled to each other, a wheel house is provided between the front side frame and the upper member, the wheel house is coupled to the dashboard lower, and a coupling portion of the wheel house and the dashboard lower is formed in a concave shape In the front structure, a rear connecting part is provided so as to close an opening of the connecting part formed in the concave shape, and the front side frame and the upper part are formed by the rear connecting part and the connecting part formed in the concave shape. A posterior skeleton with a closed cross-section is formed across the members The rear connecting portion is divided into two members, a rear portion on the front side frame side and a rear portion on the upper member side, and the upper member and the front side frame are formed on the front portion of the wheel house. A front connecting part is formed so as to cross the opening and close the opening of the concave part, and the front skeleton having a closed cross section is formed across the front side frame and the upper member at the front connecting part and the concave part. And the front connecting part is divided into two members, a front part on the front side frame side and a front part on the upper member side, and the rear connecting part and the front connecting part are the upper member The rear part on the front side frame is superimposed on the upper surface of the rear part on the side, and on the upper surface of the front part on the front side frame side Wherein the front portion of the upper member side is superimposed.

  In the invention according to claim 1, the wheel house is coupled to the dashboard lower to form a concave coupling portion. Then, the opening of the coupling portion formed in a concave shape was closed with a rear coupling portion, and a rear skeleton portion having a closed cross section was formed with the rear coupling portion and the coupling portion formed in a concave shape. After this, the skeleton part was provided over the front side frame and the upper member.

Therefore, when an impact is applied to the front end portion of the front side frame from the front of the vehicle body, the rear skeleton portion can prevent the rear end portion of the front side frame from lifting upward.
Thus, by preventing the rear end portion of the front side frame from being lifted upward, the front side frame can be favorably deformed and the impact can be more suitably absorbed.

Further, the rear connecting portion was divided into two members, a rear portion on the front side frame side and a rear portion on the upper member side.
Therefore, the rear part on the front side frame side can be assembled in advance to the front side frame, and the rear part on the upper member side can be assembled in advance to the upper member.
Thereby, since it is not necessary to convey each member of a back connection part separately, handling of the components in an assembly line becomes easy, and simplification of an assembly process can be aimed at.

In addition, in the invention according to claim 1 , a concave portion is formed in the front portion of the wheel house, and the front skeleton portion having a closed cross section is formed by closing the opening of the concave portion with the front connecting portion. And the front frame part was provided over the front side frame and the upper member.
Thereby, a deformation | transformation of a recessed part can be prevented and the rigidity of a vehicle body front part structure can be improved.

Furthermore, the front connection part was divided into two members, a front part on the front side frame side and a front part on the upper member side.
Therefore, the front part on the front side frame side can be assembled in advance to the front side frame, and the front part on the upper member side can be assembled in advance to the upper member.
Thereby, since it is not necessary to convey each member of a front connection part separately, handling of the components in an assembly line becomes easy, and simplification of an assembly process can be aimed at.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate Fr as the front side, Rr as the rear side, L as the left side, and R as the right side according to the direction viewed from the operator.

FIG. 1 is a perspective view showing a vehicle body front structure according to the present invention.
The vehicle body front structure 10 includes a right front side frame (front side frame) 12 provided on the right side of the vehicle body front side in the vehicle front-rear direction, and a right upper member ( Upper member) 14, right wheel house 16 provided between right front side frame 12 and right upper member 14, and rear ends of right front side frame 12, right upper member 14, and right wheel house 16. The dashboard lower 18 to which the parts 12a, 14a, 28a (see FIG. 3 for the rear end part 28a) are coupled, and the front skeleton part 20 and the rear skeleton part 22 spanned between the right front side frame 12 and the right upper member 14. With.

The right front side frame 12 is a frame member that is disposed on the right side of the front portion of the vehicle body and extends in the longitudinal direction of the vehicle body.
The rear end portion 12a of the right front side frame 12 is supported by a right outrigger 24 (specifically, an upper end portion 24a). The right outrigger 24 extends downward from the rear end 12a of the right front side frame 12 toward the rear of the vehicle body.

The right upper member 14 is a member provided above the right front side frame 12 and outside the right front side frame 12.
The right front side frame 12 and the right upper member 14 form a skeleton of the engine room 25.

The right wheel house 16 includes a top portion 26 that supports a right suspension (not shown), a front wall 27 provided on the front side of the top portion 26, and a rear wall 28 provided on the rear side of the top portion 26 (see FIG. 4). ) And a side wall 29 provided on the side of the top portion 26.
The right suspension supports a right front wheel (not shown).
The right wheel house 16 is provided across the right front side frame 12 and the right upper member 14.

The dashboard lower 18 is a member that is provided across the left and right pillars 31 (the left pillar is not shown) and partitions the engine room 25 and the vehicle compartment 33.
The rear end 12 a of the right front side frame 12 and the rear end 14 a of the right upper member 14 are spot-welded to the right end 18 a of the dashboard lower 18.
Further, the rear end portion of the right wheel house 16, that is, the rear end portion 28 a (see FIGS. 3 and 4) of the rear wall 28 of the right wheel house 16 is spot-welded to the right end portion 18 a of the dashboard lower 18.

  Since the vehicle body front structure 10 is substantially symmetrical, only the right member of the vehicle body front structure 10 will be described below, and the description of the left member will be omitted.

Next, the anterior skeleton 20 will be described with reference to FIGS.
FIG. 2 is a perspective view showing a front skeleton part and a rear skeleton part of the vehicle body front part structure according to the present invention, and FIG. 3 is a sectional view taken along line 3-3 of FIG.
The front skeleton portion 20 is formed in a closed cross-sectional shape by a front wall (front portion of the wheel house) 27 of the right wheel house 16 and a front connection portion 35.
As shown in FIG. 3, the front wall 27 of the right wheel house 16 is bent by a vertical wall 38 and an inclined wall 39 into a substantially square cross section.
Thereby, a recess 41 is formed in the front wall 27 of the right wheel house 16. The recess 41 is formed across the right upper member 14 and the right front side frame 12.

A front connecting portion 35 is provided across the right upper member 14 and the right front side frame 12 so as to close the opening 41 a of the recess 41.
Thereby, the front skeleton part 20 having a closed cross section is formed by the front connection part 35 and the concave part 41. That is, the closed cross-section front skeleton portion 20 is formed across the right front side frame 12 and the right upper member 14.

The front connecting portion 35 is divided into two members, a front frame side part (front part on the right front side frame 12 side) 43 and a front member side part (front part on the right upper member 14 side) 44.
The reason why the front connecting portion 35 is divided into the front frame side portion 43 and the front member side portion 44 will be described later.

FIG. 4 is an exploded perspective view showing the front skeleton part and the rear skeleton part of the vehicle body front part structure according to the present invention.
The front frame side portion 43 is a member that extends from the right front side frame 12 to the approximate center 27a of the front wall 27 with an upward slope.
The front frame side portion 43 is spot welded to the upper wall 12b and the inner wall 12c of the right front side frame 12 at the lower end 43a.
Specifically, the lower end 43 a of the front frame side portion 43 is spot-welded to the upper wall 12 b and the inner wall 12 c in the substantially center of the right front side frame 12.

Further, in the front frame side portion 43, the front side 43 b is spot welded to the inclined wall 39 and the rear side 43 c is spot welded to the vertical wall 38.
The front frame side portion 43, the inclined wall 39 and the vertical wall 38 form a closed cross section having a substantially triangular cross section.

The front member side portion 44 is a member extending from the right upper member 14 to a substantially center 27a of the front wall 27 with a downward slope.
The front member side portion 44 has an upper end portion 44 a spot welded to the inner wall 14 b of the right upper member 14.
Specifically, the upper end portion 44 a of the front member side portion 44 is spot-welded to the substantially central inner wall 14 b of the right upper member 14.

Further, the front member side portion 44 has the front side 44b spot-welded to the inclined wall 39, the rear side 44c spot-welded to the vertical wall 38, and the lower end portion 44d spot-welded to the upper end portion 43d of the front frame side portion 43. Has been.
The front member side portion 44, the inclined wall 39 and the vertical wall 38 form a closed cross section having a substantially triangular cross section.

As described above, the front frame side portion 43, the inclined wall 39 and the vertical wall 38 form a closed section having a substantially triangular cross section, and the front member side portion 44, the inclined wall 39 and the vertical wall 38 form a closed section having a substantially triangular cross section. As a result, the front skeleton part 20 is provided across the right front side frame 12 and the right upper member 14.
Thereby, the deformation | transformation of the recessed part 41 (refer FIG. 3) formed with the vertical wall 38 and the inclination wall 39 can be prevented, and the rigidity of the vehicle body front part structure 10 shown in FIG. 1 can be improved.

Next, the back skeleton part 22 will be described with reference to FIGS.
2 and 3, the rear end portion 28a (see FIG. 3) of the rear wall 28 of the right wheel house 16 is joined to the right end portion 18a of the dashboard lower 18 so that the rear end portion of the rear wall 28 is obtained. A joint 46 formed by 28a and the right end 18a of the dashboard lower 18 is formed in a concave shape having a substantially V-shaped cross section (see FIG. 3).
The coupling portion 46 formed in a concave shape is formed across the right upper member 14 and the right front side frame 12.

The rear skeleton part 22 is formed in a closed cross-section by a coupling part 46 formed in a concave shape and a rear connection part 36.
Specifically, in the rear skeleton part 22, the rear connection part 36 is connected to the rear end part 14a (see FIG. 1) of the right upper member 14 and the right side so as to close the opening part 46a of the coupling part 46 formed in a concave shape. The front side frame 12 is provided over the rear end portion 12a.
Thereby, the rear skeleton part 22 having a closed cross section is formed by the rear connection part 36 and the coupling part 46 formed in a concave shape. The closed cross section of the rear skeleton 22 is formed across the right front side frame 12 and the right upper member 14.

The rear connecting portion 36 is divided into two members, a rear frame side portion (a rear portion on the right front side frame 12 side) 51 and a rear member side portion (a rear portion on the right upper member 14 side) 52.
The reason why the rear connecting portion 36 is divided into the rear frame side portion 51 and the rear member side portion 52 will be described later.

Returning to FIG. 4, the rear frame side portion 51 is a member that extends from the right front side frame 12 to the approximate center 28 b of the rear wall 28 with an upward slope.
The rear frame side portion 51 is spot-welded to the upper wall 12b of the right front side frame 12 at the lower end 51a.
Specifically, the lower end portion 51 a of the rear frame side portion 51 is spot-welded to the upper wall 12 b of the rear end portion 12 a in the right front side frame 12.

Further, in the rear frame side portion 51, the front side 51 b is spot welded to the rear wall 28, and the rear side 51 c is spot welded to the right end 18 a of the dashboard lower 18.
The rear wall 28 is formed so as to be inclined downward toward the rear of the vehicle body (see also FIG. 3).
A closed cross section having a substantially triangular cross section is formed by the rear frame side portion 51 and the coupling portion 46 formed in a concave shape.

The rear member side portion 52 is a member extending from the right upper member 14 to a substantially center 28b of the rear wall 28 with a downward slope.
Thereafter, the upper end portion 52a of the member side portion 52 is spot-welded to the upper side (not shown) of the right upper member 14.
Specifically, the upper end portion 52 a of the rear member side portion 52 is spot-welded to the upper side of the rear end portion 14 a in the right upper member 14.

Further, the rear member side portion 52 has a front side 52b spot-welded to the rear wall 28, a rear side 52c spot-welded to the right end portion 18a of the dashboard lower 18, and a lower end portion 52d having an upper end of the rear frame side portion 51. Spot welded to the portion 51d.
A closed cross section having a substantially triangular cross section is formed by the rear member side portion 52 and the coupling portion 46 formed in a concave shape.

  As described above, a closed section having a substantially triangular cross section is formed by the rear frame side portion 51 and the connecting portion 46, and a closed section having a substantially triangular cross section is formed by the rear member side portion 52 and the connecting portion 46, whereby the right front side. A rear skeleton portion 22 is provided across the frame 12 and the right upper member 14.

  The rear skeleton portion 22 is provided at the rear end portion 12 a of the right front side frame 12. Therefore, the rear skeleton portion 22 can prevent the rear end portion 12a of the right front side frame 12 from being lifted upward when an impact is applied to the front end portion of the right front side frame 12 from the front of the vehicle body.

Here, the rear end portion 12a of the right front side frame 12 is supported by a right outrigger 24 (specifically, an upper end portion 24a). The right outrigger 24 extends downward from the rear end 12a of the right front side frame 12 toward the rear of the vehicle body.
For this reason, when an impact acts on the front end portion of the right front side frame 12 from the front of the vehicle body, the rear end portion 12a of the right front side frame 12 tends to lift upward.
Therefore, by providing the rear skeleton portion 22 at the rear end portion 12b of the right front side frame 12, it is possible to efficiently suppress the rear end portion 12a of the right front side frame 12 from being lifted upward.

Next, a process of assembling the vehicle body front part structure 10 will be described with reference to FIGS.
5A and 5B are views for explaining an example of assembling the right front side frame and the right upper member according to the present invention.
In (a), first, the front frame side part 43 and the rear frame side part 51 are spot-welded to the right front side frame 12.
On the other hand, the right wheel house 16 is spot welded to the right upper member 14. Then, the front member side portion 44 is spot welded to the right upper member 14 and the right wheel house 16, and the rear member side portion 52 is spot welded.

The right upper member 14 and the right wheel house 16 are spot-welded to the right front side frame 12 as indicated by an arrow A.
At the same time, the upper end portion 43d of the front frame side portion 43 and the lower end portion 44d of the front member side portion 44 are overlapped as shown by an arrow B.
Further, the upper end portion 51d of the rear frame side portion 51 and the lower end portion 52d of the rear member side portion 52 are overlapped as shown by an arrow C.

In (b), the upper end portion 43d of the front frame side portion 43 and the lower end portion 44d of the front member side portion 44 are spot-welded.
Therefore, the front skeleton part 20 having a closed cross section can be bridged between the right front side frame 12 and the right upper member 14.
Further, the upper end portion 51 d of the rear frame side portion 51 and the lower end portion 52 d of the rear member side portion 52 are spot welded.

FIGS. 6A and 6B are views for explaining an example in which the dashboard lower is assembled to the right front side frame, the right upper member, and the right wheel house according to the present invention.
In (a), the right end portion 18a of the dashboard lower 18 is spot welded to the rear end portion 12a of the right front side frame 12 as shown by an arrow D. Similarly, the right end portion 18a of the dashboard lower 18 is spot-welded as indicated by an arrow D to the rear end portion 14a (see FIG. 1) of the right upper member 14.

Further, the right end portion 18a of the dashboard lower 18 is spot-welded as indicated by an arrow D to the rear end portion 28a (see FIGS. 3 and 4) of the rear wall 28 of the right wheel house 16.
In this state, the right end portion 18a of the dashboard lower 18 is superimposed on the rear side 51c of the rear frame side portion 51 and the rear side 52c of the rear member side portion 52.

In (b), spot welding is performed on the rear side 51c of the rear frame side portion 51 and the right end portion 18a of the dashboard lower 18 which are overlapped.
Similarly, the rear side 52c of the rear member side portion 52 and the right end portion 18a of the dashboard lower 18 are spot-welded.
Therefore, the rear skeleton part 22 having a closed cross section can be bridged between the right front side frame 12 and the right upper member 14.
Thereby, the assembly | attachment process of a vehicle body front part structure is completed.

As described with reference to FIGS. 5 and 6, the front connecting portion 35 is divided into two members, a front frame side portion 43 and a front member side portion 44.
Therefore, the front frame side portion 43 can be assembled in advance to the right front side frame 12 and the front member side portion 44 can be assembled in advance to the right upper member 14.

Further, the rear connecting portion 36 is divided into two members, a rear frame side portion 51 and a rear member side portion 52.
Therefore, the rear frame side part 51 can be assembled in advance to the right front side frame 12 and the rear member side part 52 can be assembled in advance to the right upper member 14.

Thereby, it is not necessary to individually convey the front frame side part 43 and the front member side part 44 of the front connection part 35 and the rear frame side part 51 and the rear member side part 52 of the rear connection part 36, respectively.
Therefore, handling of parts in the assembly line is facilitated, and the assembly process can be simplified.

Next, an example in which an impact is applied to the right front side frame of the vehicle body front structure 10 will be described with reference to FIG.
FIG. 7 is a diagram for explaining an example in which an impact is applied to the right front side frame of the vehicle body front structure according to the present invention.
An impact F acts on the front end portion 12d of the right front side frame 12 from the front of the vehicle body. The impact F is transmitted to the upper end 24 a of the right outrigger 24 through the rear end 12 a of the right front side frame 12.
The transmitted load F acts to tilt the right outrigger 24 toward the rear of the vehicle body. That is, the load F works to lift the right front side frame 12 upward.

Here, a front skeleton portion 20 having a closed cross section and a rear skeleton portion 22 having a closed cross section are bridged over the right front side frame 12 and the right upper member 14.
Therefore, the rear skeleton part 22 can suppress the right front side frame 12 from being lifted upward.
In particular, the rear skeleton portion 22 can efficiently suppress the rear end portion 12a of the right front side frame 12 from being lifted upward.

Thereby, when the impact F acts on the front end part 12d of the right front side frame 12, the right front side frame 12 can be favorably deformed.
By deforming the right front side frame 12 satisfactorily, the impact F can be suitably absorbed by the right front side frame 12.

  In the above-described embodiment, the example in which both the front skeleton part 20 and the rear skeleton part 22 are provided has been described. However, the present invention is not limited to this, and the same effect can be obtained by providing only the rear skeleton part 22. it can.

In the above-described embodiment, the example in which the rear skeleton portion 22 is provided in the rear end portion 12a of the right front side frame 12 has been described. However, the portion where the rear skeleton portion 22 is provided can be arbitrarily changed.
For example, when the distance between the right wheel house 16 and the dashboard lower 18 is larger than that of the present embodiment, the rear skeleton portion 22 is provided on the front side of the vehicle body from the rear end portion 12a of the right front side frame 12. Is also possible.

  The vehicle body front structure of the present invention is suitable for application to an automobile in which a front side frame and an upper member are coupled to a dashboard lower.

It is a perspective view which shows the vehicle body front part structure which concerns on this invention. It is a perspective view which shows the front frame part and rear frame part of the vehicle body front part structure which concern on this invention. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a disassembled perspective view which shows the front skeleton part and rear skeleton part of the vehicle body front part structure which concern on this invention. It is a figure explaining the example which assembles the right front side frame and right upper member concerning the present invention. It is a figure explaining the example which assembles a dashboard lower to the right front side frame, right upper member, and right wheel house concerning the present invention. It is a figure explaining the example which the impact acted on the right front side frame of the vehicle body front part structure concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Vehicle body front part structure, 12 ... Right front side frame (front side frame), 14 ... Right upper member (upper member), 16 ... Right wheel house (wheel house), 18 ... Dashboard lower, 20 ... Front skeleton part , 22 ... rear skeleton part, 27 ... front wall (front part of wheel house), 28 ... rear wall, 35 ... front connecting part, 36 ... rear connecting part, 41 ... recessed part, 41a ... opening part of recessed part, 43 ... front Frame side part (front part on the right front side frame side), 44 ... front member side part (front part on the right upper member side), 46 ... coupling part, 46a ... opening part of the coupling part, 51 ... rear frame side part ( Rear part on the right front side frame side), 52... Rear member side part (rear part on the right upper member side).

Claims (1)

A front side frame extends in the longitudinal direction of the vehicle body, and an upper member is provided above and outside the front side frame. The front side frame and the upper member are respectively coupled to a dashboard lower, and the front side frame And a wheel house provided between the upper members, the wheel house is coupled to the dashboard lower, and a vehicle body front structure in which a coupling portion of the wheel house and the dashboard lower is formed in a concave shape,
A rear connecting part is provided so as to close the opening of the coupling part formed in the concave shape,
A rear skeleton portion having a closed cross section is formed across the front side frame and the upper member at the rear connecting portion and the coupling portion formed in the concave shape,
The rear connecting portion is divided into two members, a rear portion on the front side frame side and a rear portion on the upper member side,
On the front part of the wheel house, a recess is formed across the upper member and the front side frame,
A front connecting portion is provided so as to close the opening of the concave portion;
In the front connecting portion and the recess, a front skeleton portion having a closed cross section is formed across the front side frame and the upper member,
The front connecting portion is divided into two members, a front part on the front side frame side and a front part on the upper member side,
The rear connecting portion and the front connecting portion are
The upper surface of the part after the upper member side, the conjunction portion after the front side frame side are superimposed, the upper surface of the front portion of the front side frame side, front portion of the upper member side is superimposed A vehicle body front structure characterized by that.

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