JPH0621822Y2 - Front body structure of automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a front vehicle body structure of an automobile, and more particularly to a structure of front side frames arranged on both sides of the vehicle body in the front-rear direction.

(Prior Art and Problems Thereof) As one of front vehicle body structures of an automobile, there has been proposed one in which a vehicle body side support portion of a lower arm of a front suspension is formed without disposing a cross member. For example, Japanese Utility Model Laid-Open No. 61-17377 discloses a vehicle body front structure of this type. In this structure, the front side frame is arranged in the vehicle front-rear direction along the inside of the wheel apron that forms the side portion of the vehicle body front part, and the rear side portion joined to the dash panel member is arranged in the vehicle body downward direction. The shape has been extended toward. The lower surface of this extended portion serves as a vehicle body side support portion of the lower arm of the suspension device. In addition, an opening penetrating in the vehicle width direction is formed in the rear extension of the front side frame thus extended toward the lower side of the vehicle body, and the tie rod of the steering device can be arranged in the vehicle width direction through this opening. ing.

Has become.

(Problems to be Solved by the Invention) In such a structure, the rear extension portion of the front side frame is a portion where stress is likely to be transmitted due to load transmission from the front side of the front side frame and the suspension arm side. Therefore, it is desirable that the rear extension has a structure that is firmly connected to the dash lower panel member.

In view of this point, an object of the present invention is to realize a front body structure of an automobile having a structure in which a rear end portion of a front side frame is firmly connected to a dash panel member.

(Means for Solving the Problems) In order to achieve the above-mentioned object, in the vehicle body structure of the vehicle of the present invention, from the vehicle body front end inside the wheel apron forming the side wall of the vehicle body of the vehicle, A front side frame having a closed cross-sectional shape is arranged toward the front-rear direction of the vehicle until reaching the dash panel member, and a rear end portion of the front side frame joined to the dash panel member has a steering device in a vehicle width direction. A reinforcing member is arranged in the closed cross section of the front side frame located between the insertion hole for inserting the member extending to the dash panel and the dash panel, and the rear end of the reinforcing member is the dash panel member. , Its front end is connected to the insertion hole surface, and its bottom is connected to a bottom plate member forming a bottom surface at the rear end of the front side frame. It is characterized by being

With such a structure, the strength of connection between the front side frame and the dash panel member is further increased by the reinforcing member. As a result, it is possible to solve problems such as deterioration of vibration characteristics and increase of noise due to insufficient strength of the joint portion.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 are views showing an embodiment of the present invention. First, FIG. 5 shows a basic framework of the front portion of the vehicle body of this example. Since the left and right structures are symmetrical, the left part will be described in the following description. As shown in the figure, the side wall of the front part 1 of the vehicle body is formed by a wheel apron 2, and a cylindrical suspension tower 3 is integrally formed in a substantially central portion of the apron. A front side frame 4 is arranged in the vehicle front-rear direction at a lower position inside the wheel apron 2 in the vehicle width direction. The frame 4 extends from the front end of the vehicle body to the positions of the dash lower panel 5 and the dash lower member 6 and is connected to these. The rear portion of the frame is extended inwardly toward the lower side of the vehicle body over a certain length, and the tie rod 8 of the steering device is inserted in the vehicle width direction at the approximate center of the extension portion 4b. An insertion hole 9 for allowing the insertion is formed.

On the other hand, as shown in FIGS. 1 and 2, the lower portion of the dash lower panel 5 is bent toward the rear side of the vehicle body to form an inclined wall 5a. On the other hand, the dash lower member 6 has an L-shaped cross section, and is joined to the dash lower panel 5 to form a triangular tubular cross section 5b extending in the vehicle width direction. As can be seen from FIG. 2, the dash lower panel and dash lower member are the same as the above-mentioned extension 4b of the front side frame.
Has a shape curved toward the rear side of the vehicle body from a position adjacent to the position joined to the front side inner surface 10a of the front end of the side sill 10 extending in the vehicle body front-rear direction at the lower end of the vehicle body side portion. There is. Here, the lower surface 6a of the triangular tubular cross section 5b constituted by the dash lower panel and the dash lower member is at the same height position as the lower surface of the extension portion 4b of the front side frame, and these lower surfaces are A lower arm bracket 12 constituting a vehicle body side support portion of a lower arm 11 of the suspension device is bolted.

With reference to FIG. 3 and FIG. 4 as well, the structure of the extension portion 4b of the front side frame and the connecting portion between the extension portion 4b and the dash lower member will be described in more detail.

The front side frame 4 is composed of a front side frame outer 13 and a front side frame inner 14 located on the outer side and the inner side in the vehicle width direction.
The inner 14 has a groove-shaped cross section that opens toward the outside in the vehicle width direction, and the flat outer 13 is joined to the open side by spot welding to form a box-shaped closed cross section. Further, the upper end portion of the outer 13 is joined to the inner side surface of the lower end portion of the wheel apron 2. In the extension portion 4b formed at the rear end portion of the front side frame, the upper end wall 14a of the groove-shaped inner 14 extends horizontally to the side thereof, and the flange 14d formed at the rear end thereof is joined to the dash lower panel 5. . On the other hand, the bottom wall 1
4b is curved downward and extends to a position substantially the same as the lower surface of the dash lower member 6. The side wall 14c connecting the both end walls extends to a position lower than the lower end wall 14b. A flange 14e, which is continuous with the flange formed at the rear end of the upper end wall 14a, is formed at the rear end of the side wall of the vehicle body, and the flange is also joined to the dash lower panel and the dash lower member. .

On the other hand, the outer 13 side extends to the same position as the lower end wall 14 b of the inner 14. The central portion of the outer member is pressed against the side wall 14c of the inner member to form the inner peripheral wall 9a of the insertion hole 9 of the tie rod 8. The tip of the inner peripheral wall 9a, that is, the inner end in the vehicle width direction, is formed by the inner side wall 14a.
It is joined to a flange formed by bending the outer peripheral edge of the opening opened in c to the outer side. The bottom end opening of the extension portion 4b is closed by a separate bottom plate member 15. As shown in FIG. 3, an outer edge and an inner edge in the vehicle width direction of the bottom plate member 15 are respectively bent up and down to form flanges 15a and 15b.
3 and the inner surface of the lower end of the inner 14 are spot welded. The front side edge of the vehicle body of the bottom plate member 15 is also bent upward to form a flange 15c, which is spot-welded to the inner surface of the lower end of the inner member 14.

Here, in the extension portion 4b, the dash lower member 6
4c inside the closed cross-section located between the tie rod insertion hole 9 and
A reinforcing member 16 joined to the dash lower member is attached to the lower corner. The reinforcing member 16 is provided with a rectangular flat inclined wall 161, and flanges 162 and 163 formed by slightly bending these portions are formed above and below the inclined wall 161. Lower flange 163
Is sandwiched between the lower end edge of the side wall 14c of the front side frame inner and the flange 15b of the bottom plate member and joined thereto. As can be seen from FIG. 3, the upper flange 162 is provided on the side wall 14 of the front side frame inner.
A portion 141 that is largely inclined outward in the vehicle width direction at c
Is joined to the inner surface of the. A front wall 164 that is bent outward in the vehicle width direction is formed continuously with the edge of the inclined wall 161 on the front side of the vehicle body, and the upper end portion of the front wall is
As shown in FIG. 2, it is joined to the edge portion of the inner side wall 14c joined to the edge portion of the insertion hole inner peripheral surface 9a of the outer 13. The lower end portion of the front wall 164 is bent toward the front side of the vehicle body to form a flange 165, and this flange is joined to the upper surface of the bottom wall member 15. On the other hand, a rear wall 166 that is bent inward in the vehicle width direction is formed continuously from the edge of the inclined wall 161 on the rear side of the vehicle body. This rear wall is formed of the dash lower member 6 and the front side frame inner 14. It is arranged so as to be located between the flange 14 e and joined to the dash lower member 6.

Next, the lower arm bracket 12 of the suspension device arranged on the bottom side of the extension portion 4b has a box-shaped cross-section formed by joining the L-shaped inner and outer panels 12a and 12b. This bracket 12
Are connected to the lower surface of the bottom plate member 15 of the extension portion by two bolts 17. Also, the bracket 12
The rear side of the body of the car is two holts 18 arranged in the vehicle width direction.
Is connected to the lower surface of the triangular tubular cross section 5b formed by the dash lower panel and the dash lower member.

In this example configured as described above, the front side frame and the dash lower member 6 are provided by the reinforcing member 16.
Among the connecting portions between the and, especially the inner lower corner portion in the vehicle width direction is reinforced by the reinforcing member 16. As can be understood from FIG. 2, this portion is a portion that supports the lower portion of the extension portion that supports the suspension lower arm in a cantilever shape. Therefore, by increasing the strength of such a connecting portion, it is possible to suppress the lateral vibration particularly at the lower portion of the extension portion.

Further, in this example, as can be seen from FIGS. 2 and 3, in the closed cross-section inside 4c of the extension 4b, a part of the internal space is partitioned by the inclined wall 161 of the reinforcing member to form a node. It is in a state. Since the interior is partitioned in this way, there is also the advantage that the rigidity of the closed cross section can be increased.

It should be noted that the above-mentioned embodiment shows one form of the present invention, and the present invention is not limited to this embodiment. For example, the reinforcing member may have another shape. Further, the mounting range of the reinforcing member may be changed, and for example, the reinforcing member may be mounted on the outer side of the front side frame.

(Effects of the Invention) As described above, according to the present invention, in the front side frame, the reinforcing member coupled to the dash lower member is provided in the closed cross section located between the dash lower member and the insertion hole for the steering device. The reinforcing member is attached to the front side frame forming a closed cross section. Therefore, the reinforcing member strengthens the coupling between the front side frame and the dash lower member, and it is possible to suppress the generation of vibration, noise, and the like due to insufficient coupling strength of such a portion.

[Brief description of drawings]

FIG. 1 is an enlarged partial perspective view showing a rear portion of a front side frame according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a portion cut along line II-II in FIG. Three
1 is a partial cross-sectional view showing a portion taken along line III-III in FIG. 1, FIG. 4 is a perspective view showing a reinforcing member, and FIG. 5 is a schematic configuration diagram showing a basic frame structure of a vehicle body front structure. is there. 1 ... Front part of vehicle body 2 ... Wheel apron 4 ... Front side frame 4b ... Extension of front side frame 4c ... Closed cross section located between dash lower member and insertion hole 5 ... Dash lower panel 6 Dash lower member 9 Tie rod insertion hole 11 Suspension lower arm 12 Lower arm bracket 15 Bottom plate member 16 Reinforcing member

Claims (1)

[Scope of utility model registration request] 1. A front side frame having a closed cross-sectional shape is arranged in a front-rear direction of a vehicle body from a front end of the vehicle body to a dash panel member, inside a wheel apron forming a side wall of a front vehicle body of an automobile. At the rear end of the front side frame joined to the dash panel member, the front side frame located between the dash panel and an insertion hole for inserting a member of the steering device extending in the vehicle width direction is closed. A reinforcing member is arranged in the cross section, and the reinforcing member has a rear end on the dash panel member and a front end on the insertion hole surface,
A front vehicle body structure for an automobile, characterized in that bottom portions thereof are respectively coupled to bottom plate members forming a bottom surface at a rear end portion of a front side frame.