JPH01182178A - Front car body structure for automobile - Google Patents

Abstract

PURPOSE:To improve twist and bending rigidity of a part where a reinforcing member is mounted, by a method wherein the reinforcing member is mounted to the interior of a closed section between the insertion hole of the steering member of a front side frame and a wheel apron. CONSTITUTION:The rear part of a frame 4 is extended in a state to be bent inwardly and downwardly of a car body throughout a specified length. An insertion hole 9 in which a tie rod 8 of a steering device is inserted in the direction of width is formed approximately in the central part of an extension part 4b. A reinforcing member 16 is mounted in the insertion hole 9 and an interior 15 of the closed cross section of the suspension power of a wheel apron. The reinforcing member 16 is formed in a groove shape in cross section opened to the outside in the direction of the width of a car. The closed cross section 15 has a length ranging from a position adjoined to a dash lower panel 5 to a position passing a suspension tower 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a front body structure of an automobile, and more particularly to a structure of a front side frame disposed on both sides thereof in the longitudinal direction of the vehicle body.

(Prior Art and its Problems) As one of the front body structures of an automobile, one has been proposed in which a cross member is arranged to provide a support part on the body side of the lower arm of the front suspension. There is. For example, Japanese Utility Model Application Publication No. 61-17377 discloses this type of vehicle body front structure. In this structure, the front side frame is arranged in the longitudinal direction of the vehicle body along the inside of the wheel apron that forms the front side of the vehicle body, and the rear part joined to the dash panel is oriented toward the bottom of the vehicle body. It has an extended, curved shape. The lower surface of this extension is the support part of the suspension lower arm on the vehicle body side. In order to form such a support part, an opening that penetrates in the vehicle width direction is formed in the rear extension part of the front side frame that extends toward the bottom of the vehicle body, and the tie rod of the steering device is inserted into the vehicle through this opening. It can be placed in the width direction.

(Problem to be Solved by the Invention) In such a structure, stress concentration occurs in the rear extension of the front side frame as loads are transmitted from the front side of the front side frame, the suspension side, and the floor side plate side. That's the easy part. If the rigidity of this part is low, it is not preferable because it causes problems such as an increase in vehicle body vibration and an increase in noise inside the vehicle. However, in this type of structure as described above, an insertion hole for the tie rod of the steering device is formed in this extension, so there is a risk that the rigidity of this frame part in the vehicle width direction and the vehicle body vertical direction is insufficient. There is.

SUMMARY OF THE INVENTION In view of these problems, an object of the present invention is to realize a front body structure of an automobile in which the rear extension portion of the front side plate in which the insertion hole for the tie rod is formed has sufficient rigidity. .

(Means for Solving the Problems) In order to achieve the above object, in the front body structure of an automobile of the present invention, at least the rear extension portion of the front side frame is provided with a steering device in the vehicle width direction. The structure is such that a reinforcing member is attached inside the closed section portion of the front side frame located between the wheel apron and the insertion hole through which the disposed member is inserted.

In this way, by attaching the reinforcing member, the rigidity of the portion of the front side frame is increased. Furthermore, when the rigidity of this portion increases, the front side frame itself is firmly connected to the highly rigid wheel apron via this increased rigidity portion. As a result, the torsional and bending rigidity of the front side frame can be increased, and problems such as increased vibration and increased noise caused by insufficient rigidity can be solved.

(Example) The present invention will be described in detail below with reference to the drawings.

1 to 5 are diagrams showing one embodiment of the present invention. First, FIG. 5 shows the basic framework of the front part of the vehicle body of this example. Since the left and right structures are symmetrical, the following explanation will focus on the left side. As shown in the figure, the side wall of the engine compartment of the front portion 1 of the vehicle body is formed by a wheel apron 2, and a cylindrical suspension tower 3 is integrally formed approximately in the center of this apron. At a lower position inside the wheel apron 2 in the vehicle width direction, a front side frame 4 is arranged in the longitudinal direction of the vehicle body. This frame 4 starts from the front end of the vehicle body:
, extends to the lower panel 5 and the darts lower member 6, and is coupled thereto. The rear part of the frame is extended over a certain length in an inwardly curved state toward the bottom of the vehicle body, and the tie rod 8 of the steering device is inserted into the approximately center of this extension part 4b in the vehicle width direction. An insertion hole 9 is formed for this purpose.

On the other hand, as shown in FIG. 1, the lower portion of the darts lower panel 5 is bent toward the rear side of the vehicle body to form an inclined wall 5a.
is formed here, and a needle lower member 6 with an L-shaped cross section is formed here.
are joined, thereby forming a cylindrical cross section 5b with a triangular cross section extending in the vehicle width direction. This cross section 5
Both side portions in the vehicle width direction of b are curved toward the rear of the vehicle body and are joined to the Zydo sill 7.

A bracket 12 constituting a support portion of the suspension lower arm 11 on the vehicle body side is fixed to the lower end of the extension portion 4b of the front suspension arm 1. This bracket 12 has a box-like closed cross-sectional shape, and its rear side is located on the lower surface of the needle lower member 6 and is fixed thereto.

Next, the structure of the above-mentioned front side plate extension portion 4b will be explained with reference to FIGS. 1 to 4. The front side frame 4 is composed of a front side frame outer 13↓ and a front side frame inner 14 located on the outside and inside in the vehicle width direction. The inner 14 has a groove-shaped cross section that opens outward 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. In addition, the upper end portion of the outer 13 is connected to the wheel apron 2.
It is joined to the inner surface of the lower end of the

In this front side frame extension part 4b,
The upper end wall 14a of the groove-shaped inner 14 extends horizontally on its side,
The flange 14d formed at the rear end of the darts lower
It is joined to panel 5. In contrast, the lower end wall 14b
is curved downward, and its lower end extends to the same position as the lower surface of the darts lower member 6. The lower end of the side wall 14C connecting these end walls extends below the lower end wall 14b and is joined to the side of the bracket 12. Further, a flange 14e is formed at the rear end of the vehicle body of this side wall, which is continuous with a flange 14d formed at the rear end of the upper end wall 14a, and this flange is also connected to the darts lower panel 5 and the darts lower member 6. is joined to. On the other hand, the outer 13 side is
(It is extended to the same position as the wall 14b, and its central portion is pressed to the side wall 14c of the inner side to form the inner circumferential wall 9a of the insertion hole 9 of the tie rod 8. This inner circumferential wall 9
The tip of a is connected to the inner side wall 14c as shown in FIG.
The inner side wall 14c projects inward beyond the opening, and this projecting edge portion is joined to a flange formed by bending the opening end of the inner side wall 14c.

A lower end opening of the extension portion 4b is closed by a bottom plate member 17. That is, a downwardly bent flange is formed on the inner edge of the bottom plate member 17 in the vehicle width direction, and this part is sandwiched between the side part of the bracket 12 and the lower edge of the inner side x=14C. It is connected there.

Further, the outer edge of the bottom plate member in the vehicle width direction is formed with a flange bent upward, and this part is joined to the inside of the lower edge of the outer 13, and the front edge of the bottom plate member is formed with a flange bent upward. is formed, and this portion is joined to the inside of the lower edge of the inner lower end wall 14b. The above bracket 1 is attached to the bottom surface of the bottom plate member 17 attached in this way.
2 is fixed by bolt connection.

Here, in the extension part 4b configured in this way, a reinforcing member 16 is attached to the inside 15 of the closed section of the front side frame located between the insertion hole 9 and the suspension tower 3 of the wheel apron. . This reinforcing member 16 has a groove-shaped cross section that is open outward in the vehicle width direction, and has a length from a position adjacent to the darts lower panel 5 to a position beyond the suspension hoe 3 in the inside 15 of the closed cross section. have. To explain in more detail, the second end wall 16a and the side q 16 of this reinforcing member
b is the upper end of the inch as shown in the second bacterium"J 14 a
and is joined to the inner surface of the side wall 14c. Top”41
6a has a width narrower than the entire width of the inner upper end wall 14a. Further, the side wall 16b has a width shorter than the height of the closed cross section in which the reinforcing member is arranged, and a lower end wall 16C is continuous to the lower end thereof. A flange 16d whose side end is bent downward is formed on the lower end wall 16C, and this flange 16d is joined to the inner surface of the outer. This reinforcing member 16 has a cross-sectional shape that gradually widens downward as it goes toward the front side, and the lower surface of the lower end wall 16c at the front end portion is in inches.
c, and the flange 16d of the lower end wall 16c is sandwiched between the outer and inner parts and joined thereto.

In this example configured in this manner, the closed section portion of the front side frame located between the wheel apron 2 and the tie rod insertion hole 9 is reinforced by the reinforcing portion 16. Therefore, the rigidity of this portion is increased, and the extension portion 7 of the front side frame is coupled to the wheel apron 2 via this increased rigidity portion. As a result, an increase in vibration and noise due to insufficient rigidity of the extension portion 7 can be avoided.

In addition, in the above embodiment, the upper end wall 16b of the reinforcing member 16
The width of the front side frame 1 is narrower than the inner width of the front side frame 1-. Instead, as shown in FIG. 6, the upper 2mV is applied across the entire width, and the edge 16e is bent upward to form the outer 1 of the front side frame.
3 and inner 14, and may be joined at this portion.

In such a case, this closed cross-section portion is connected to the wheel apron side, particularly to the highly rigid suspension tower 3, via a reinforcing member. Therefore, the rigidity of this portion can be made even higher.

Next, FIG. 7 to FIG. 1O are diagrams showing another embodiment of the present invention. In this example, the reinforcing member is arranged inside the closed section between the wheel apron and the tie rod insertion hole, and is also arranged inside the closed section of the front side frame located on the front side of the vehicle body of the insertion hole. ing. In this example, the only difference is the shape and mounting position of the reinforcing member, and the other structure is the same as the above example.
In the following description, the same reference numerals will be used for the same parts, and the description thereof will be omitted.

In this example, the extension portion 4b of the front side frame
Insertion hole 9 for wheel apron 2 and tie rod in
A reinforcing member 22 is attached to the closed cross section interior 15 between the two and the closed cross section interior 21 located further forward of the vehicle body than the insertion hole 9. As can be seen from FIG. 10, this reinforcing member 22 is composed of a first reinforcing member 23 disposed inside the - side cross section 15 and a second reinforcing member 24 disposed inside the other cross section inside 21. has been done. First reinforcing member 23
has almost the same shape as the reinforcing member 16 of the above-described embodiment, but its rear end extends to the darts lower panel 5. As shown in FIG. 7, in this position, the flange 23e formed on the lower end wall 23b of the reinforcing member is sandwiching the upper end portion 6a of the needle lower member 6.
It is joined to the front side of the needlework lower panel 5.

On the other hand, the second reinforcing member 24 has a flat plate shape as a whole, and is arranged diagonally inside the box-shaped closed section 21, as shown in FIG. 24a and 24b are sandwiched and joined between the outer 13 and inner 14 of the front side frame. The upper end edge 24c of this reinforcing member is extended to a position where it is sandwiched between the side wall 23C of the first reinforcing member 23 and the inner 14 of the front side frame, and is joined between them at this position. .

On the other hand, the flange 24b separates inwardly from the outer 13 and the inner 14 at its upper portion and extends upward, and its upper edge portion is in contact with the lower surface of the lower end wall 23b of the other reinforcing member 23. There is. On the other hand, the lower end portion of this reinforcing member 24 is bent inside the vehicle body.
Flange 24d joined to the inner surface of the inner side wall 14c
is formed.

In this example configured in this way, the closed cross-section portion of the front side frame between the wheel apron and the insertion hole is reinforced, and the closed cross-section portion located in front of the insertion hole is also reinforced.

Therefore, the torsional and bending rigidity of the front side plate extension having the insertion hole is increased, and the disadvantages caused by insufficient rigidity of this portion can be eliminated. Furthermore, in this example, the rear part 11 of the first reinforcing member arranged inside the closed section between the wheel apron and the insertion hole is joined to the darts lower panel, so that the extension part and the darts lower panel are connected to each other. This is preferable because the bonding strength is high.

In addition, in the above example, the reinforcing member 22 is divided into two members 23.2.
4, but these can also be made into an integral member.

(Effects of the Invention) As explained above, in the vehicle body structure of the present invention, the reinforcing member is attached at least inside the closed section between the insertion hole of the steering member and the wheel apron in the rear extension of the front side frame. That's what I do.

Therefore, since the torsional and bending rigidity of this portion is increased, it is possible to suppress vibrations, noise, etc. caused by insufficient rigidity of this portion.

[Brief explanation of the drawing]

FIG. 1 is an enlarged partial perspective view of the rear extension of the front side frame according to an embodiment of the present invention, and FIG. 2 shows the front side frame 2 of FIG. FIG. 3 is a perspective view showing the inches that make up the rear side extension JdB of the front side frame in FIG. 5 is a schematic configuration diagram showing the basic framework of the front structure of the vehicle body, FIG. 6 is a partial sectional view showing another example of the structure of the reinforcing member, and FIG. 7 is a diagram showing another embodiment of the present invention. 8 is a partial sectional view taken along the line ■-■ in FIG. 7, and FIG. 9 is a partial perspective view taken along line IX-IX in FIG. 7.
FIG. 10 is a partial sectional view showing a section taken along a line, and FIG. 10 is an exploded perspective view showing the reinforcing member of FIG. 7. 1 Vehicle front part 2 Wheel apron 3 Suspension tower 4 Front side frame 4b Extension part 5 Darts lower panel 6 Darts lower member 9 Insertion hole 11 Lower arm 12 Bracket 13 Outer 14 Inner 15 Closed section interior 16 Reinforcement member 17 Bottom plate member 4th factor Figure 5

Claims (1)

[Claims] A front side frame with a closed cross section is arranged along the inside of the wheel apron that forms the side wall of the front body of the car in the longitudinal direction of the car body. An insertion hole is formed for inserting a member extending in the width direction, and at least an inside of the closed section of the front side frame located between the insertion hole and the wheel apron is provided with a hole for reinforcing the closed section. A front body structure of an automobile, characterized in that a reinforcing member is attached.