JPS6154368A - Chassis front part structure of car - Google Patents

Abstract

PURPOSE:To increase the rigidity of the supporting part of a suspension lower arm by arranging a horizontal reinforcing member at the corner part between the projection part of a floor side frame for supporting the suspension lower arm and a dash lower panel. CONSTITUTION:The top edge of a floor side frame 7 is projected by a prescribed length into an engine room 1 from a dash lower panel 3. Said projection part forms a front lower side frame 8, and the lower arm 9 of a front suspension is supported in swingable ways at two positions onto the frame 8. A gusset 10 is spot-welded onto the frame 8. Said gusset 10 is laid onto a corner part 11 formed by the frame 8 and the dash lower panel 3, and the edge part 10a of the dash lower panel 3 side is extended to the undersurface of a floor panel 5, and joined with the floor panel 5 through spot welding.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the front structure of an automobile body, and particularly to the structure of a mounting portion of a lower arm of a front suspension.

(Prior Art) There are two types of lower arms of front suspensions of automobiles: I-shaped lower arms in which both ends are supported at one point, and human-shaped lower arms in which one end is bifurcated and supported at two points. Among these, the structure of the mounting part that allows for suitable mounting of those that are supported at two points on the vehicle body side, such as the lower arm of the A type, is disclosed in Japanese Utility Model Application No. 55-129173 filed by the present applicant. It is disclosed in the publication No. In the structure disclosed in this publication, a front lower side frame is formed by extending a floor side frame extending in the front-rear direction on the lower surface of a vehicle floor in a forward direction, and a lower arm of a suspension is supported on this front lower side frame.

(Problems to be Solved by the Invention) The support portion of the lower 7-me configured as described above is required to have high rigidity, so it must be strong. especially,
If the front lower sight frame that constitutes the supporting portion vibrates or deforms from side to side, the steering stability of the vehicle will be impaired.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a front structure of an automobile body that can provide a lower arm support portion with high rigidity.

(Means for Solving the Problems) The present invention has a floor side frame extending in the longitudinal direction of the vehicle body on the lower surface of the vehicle body floor, which extends toward the front of the vehicle body and projects from the darts lower panel into the engine route 11. In a vehicle body 111 structure in which a lower arm of a suspension is swingably supported on a vehicle body, the protruding portion and the darts lower panel are connected to a corner formed by the projecting portion and the darts lower panel. It is characterized by the provision of horizontal reinforcing members.

(Example) Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows the right front part of the vehicle body in one embodiment of the present invention, and FIG. 2 shows a cross section taken along the line - -. In the figure, reference numeral 1 denotes an engine room formed at the front of the vehicle body, which is divided by a wheel apron 2 forming both side walls and a darts lower panel 3 forming a rear wall. A front side frame 4 extends below the wheel apron 2 in the longitudinal direction of the vehicle body, and has a U-shaped cross-sectional shape with an open outer side. The frame 4 is joined to the wheel apron 2 to form a closed cross section extending in the longitudinal direction of the vehicle body at the lower side of the engine compartment 1.

On the other hand, the lower part of the dash lower panel 3 is joined to a vehicle body floor panel 5, and this floor panel 5 extends from the dash lower panel 3 toward the rear of the vehicle body. Diagonal members 6 are disposed at the corners of both panels so as to form a triangular closed cross section.

7 is a floor sight frame extending in the longitudinal direction of the vehicle body on the lower surface of the vehicle body floor panel 5, has a U-shaped cross section opening upward, and is joined to the floor panel 5;
A closed cross section extending in the longitudinal direction of the vehicle body is formed on the lower side surface of the floor panel 5.

The tip of the floor side frame 7 is extended toward the front of the vehicle body and projects into the engine room 1 by a predetermined length from the darts lower panel 3, and the projecting portion forms a front lower side frame 8. The front side frame 1 - lower side frame 8 is located at the lower side of the engine room 1 , is approximately parallel to the front side frame 4 , and is located lower and inner than the front side frame 4 . The inner end of a lower arm 9 of a front suspension is swingably supported at two points on the front lower side frame 8. That is, a front base end 9a of a lower arm 9 is supported at the front end of the front lower side frame 8, and a rear base end 9b of the lower arm 9 is supported at the rear end of the frame 8.

On the other hand, 10 has a front lower side fly J, and a subono h on the upper side of 8? It is a gaseso l- joined by an 8-contact or the like. This gusset 10 is the front lower side frame 8
The frame is extended to a corner 11 formed by the lower panel 3 and the lower panel 3, and its end 10a on the lower panel 3 extends to the lower surface of the floor panel 5, where spot welding (by concubines etc.) is carried out. It is joined to the floor panel 5.

Next, 12 is a connecting member that connects the front lower sight frame 8 and the front side frame 4. The connecting member 12 has a substantially rectangular parallelepiped shape as a whole, and has a tie loft through hole 12a formed in the center thereof through which a tie rod (not shown) extending in the vehicle width direction is passed. At the upper end side of such a connecting member 12, as shown in FIG.
b and the inner panel 12C are joined to the lower surface and side surface of the front side frame 4, respectively. Also,
On the lower part 1 side of the connecting member 12, as also shown in FIG. 2, an outer panel 12b and an inner panel 12C are joined to the upper surface 10b of the gusset 10 to form a closed cross section.

In the figure, 13 is a tire house formed on the wheel apron 2, and 14 is a suspension tower also formed on this apron.

According to this embodiment configured in this way, the gusset 10 increases the rigidity of the corner 11 between the front lower side frame (front lower side frame) (and the darts lower panel 3), especially the rigidity against horizontal movement. 9, the gusset effectively acts against the load acting on the front lower side frame 8 that supports the support member, and lateral movement of the front lower side frame 8 is reliably prevented. Since the point is held at a fixed position with respect to the vehicle body, handling stability can be improved.

Here, in the above embodiment, the gusset 10 is separate from the front lower side frame 8 and the connecting member 12, and is joined to the art material 10.12, but the art material 10. The gusset 10 may be formed by either one or both of the gussets 12.

3 to 7 show examples of forming the gusset 10 in this manner.

First, FIG. 3(A) shows the inner panel 1 of the connecting member 12.
A gusset portion 31 is formed by horizontally extending the lower end portion (joint portion with the front lower side frame 8) 12 ct of the lower end portion 2b toward the engine room 1 side. FIG. 3(B) further shows the lower end 1 of the outer panel 12G of the connecting member 12.
2e is bent inward at a substantially right angle and extended to the inner panel 12b, and its tip 12f is sandwiched between the inner panel 12b and the front lower side frame 8 and joined. Bent portion 1 of this outer panel 12c
2g is preferable because it increases the horizontal rigidity of the closed cross section formed by the connecting member 12 and the front lower side frame 8.

In the example shown in FIG. 4, gasset parts 1 to 31 are formed by the outer panel 12C, and the lower end part 12e of the outer panel 12C is bent inward at a substantially right angle and extended horizontally into the engine room 1 to form the gusset part. It is set at 31. The inner panel 12b and the front lower side frame are joined to each other with the gusset portion 31 sandwiched therebetween.

In the example shown in FIG. 5, both the inner panel 12G and the outer panel 12b form a gap 3t. In other words, the lower end portion 12d of the inner panel 12b is bent to form the upper gusset portion 31a in the same manner as in the example shown in FIG. Fold the bottom part 1
A portion 31t) is formed, and these upper and lower gusset portions are joined by spot welding, bolts, or other fastening means to form the gusset portion 31. By doing so, the strength of the gusset portion can be increased.

In the example shown in FIG. 6, a gusset portion is formed by the front lower side frame 8, and the upper end portion 8a of the side wall of the frame 8 on the engine room 1 side is horizontally extended toward the engine room 1 side to form the gusset portion 31. That is.

In the example shown in FIG. 7, the gusset portion 31 is formed by the connecting member and the fluorocarbon l-+:+anite fluorocarbon.

In FIG. 7(A), the gusset portion 31 is formed by the inner panel 12b and the front lower side frame 8, and in FIG. 7(B), the gusset portion 31 is formed by the outer panel 12c and the front lower side frame 8. is forming. Further, in FIG. 7(C), a gusset portion 31 is formed by three members: the inner panel 12b1, the outer panel 12C, and the frame 8. In this way, it is possible to increase the strength of the gusset portion 31 as required.

(Effects of the Invention) As explained above, according to the present invention, horizontal reinforcing members (gussets) are provided at the corners of the front lower side frame and the darts lower panel, which are the supporting parts of the suspension lower arm, so that both Since the members are connected, the horizontal rigidity of the front lower side frame is increased, and improved steering stability is achieved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
The cross-sectional views taken along line nn in the figure and FIGS. 3 to 7 are cross-sectional views showing examples of the structure of the gusset, respectively. 1-Engine room, 2-Wheel apron, 3-・-
Tassosch lower panel, 4-front side frame,
5--floor panel, 7-floor side frame, 8
-Front lower side frame (projection), 9-lower arm, 10-gusset (horizontal reinforcing member), 11-corner, 12 connecting member.

Claims (1)

[Claims] The front of an automobile body consists of a floor side frame that extends in the longitudinal direction of the vehicle body on the underside of the vehicle floor, extends toward the front of the vehicle body, projects from the dash lower panel into the engine room, and the lower arm of the suspension is swingably supported on the protruding part. A vehicle body front structure for an automobile, characterized in that a horizontal reinforcing member connecting the protruding part and the dash lower panel is disposed at a corner formed by the protruding part and the dash lower panel.