JPH0352616Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the lower body structure of an automobile, and more specifically, to the body structure of the boundary portion between the front frame and the floor frame.

(Prior Art) Important strength members extending in the longitudinal direction at the lower part of the vehicle body include a front frame and a floor frame, each of which has a closed cross section. The front frame is located forward of the dash panel that partitions the engine room and the passenger compartment, and is joined to the lower part of the wheel apron that forms the side wall of the engine room, and the floor frame is joined to the lower surface of the floor panel. On the other hand, as an important strength member located at the lower part of the vehicle body and extending in the vehicle width direction, there is a cross member that is joined to the lower part of the dash panel and forms a closed cross section.

The above-mentioned front frame and floor frame are separated from each other in the front-rear direction approximately at the darts panel. Therefore, it is possible to improve the strength near the darts panel, especially in the case of a frontal collision, which reduces the load from the front frame to the rear. Some kind of countermeasure is needed to widely disperse and absorb the vibrations from the engine, engine, etc. to the vehicle body.

For this reason, conventionally, as shown in Japanese Patent Application Laid-Open No. 59-109468, the front frame and the floor frame have been connected via a joint member that penetrates in the front-rear direction within a closed section formed by a cross member. There is something I did.

(Problem to be solved by the invention) By the way, as in the above publication, if the front frame and the floor frame are connected via a joint member, the strength in the front and rear direction can be improved, but it is not possible to improve the strength in the front and rear direction. This is not necessarily sufficient in terms of load distribution in the vehicle width direction. Moreover, since the front frame and the floor frame are directly joined, there is a limit to how strong the connection can be increased, and some kind of countermeasure is desired in this respect as well.

Therefore, an object of the present invention is to make it possible to effectively transmit the rearward load from the front frame to the floor frame and the cross member by effectively utilizing the cross member, and to effectively transmit the rearward load from the front frame to the floor frame and the cross member. It is an object of the present invention to provide a lower vehicle body structure for an automobile, which can ensure sufficient connection strength at the connection portion with the vehicle.

(Means and effects for solving the problems) In order to achieve the above-mentioned object, the present invention has the following configuration. In other words, the front frame is placed in front of the darts panel that separates the engine room from the passenger compartment and extends in the front-rear direction to form a closed cross-section, and the floor is joined to the lower surface of the floor panel and extends in the front-rear direction to form a closed cross-section. In the lower body structure of an automobile, comprising a frame and a cross member that is joined to the lower end of the dash panel and extends in the vehicle width direction to form a closed cross section, the cross member has a cross member that extends rearward and has a cross section of approximately U.
A joint member having a substantially U-shaped cross section is disposed so as to penetrate in the front-back direction within the closed cross section formed by the cross member, and a joint member having a substantially U-shaped cross section is disposed so as to penetrate in the front and rear direction within the closed cross section formed by the cross member. A front end portion is joined to the front frame, a rear end portion of the joint member is joined to the front portion of the rear extension portion in a fitted state, and a front end portion of the floor frame is joined to the rear portion of the rear extension portion. The structure is such that they are joined in a fitted state.

In this way, the front frame and floor frame are connected via the rear extension of the cross member and the joint member, so rearward loads and vibrations from the front frame are effectively transmitted to the floor frame. be able to. especially,
By using the rear extension that extends rearward, the joint member that extends from the front frame is connected to the floor frame while being fitted, increasing the connection strength of this part and connecting it to the floor frame. Not only can this rear load and vibration be effectively transmitted, but also the rear load and vibration can be effectively transmitted and dispersed to the cross member, that is, in the vehicle width direction.

(Example) An example of the present invention will be described below based on the attached drawings.

In FIG. 1, reference numeral 1 denotes a dash panel, the front side of which is the engine room side, and the rear side is the vehicle interior side. As shown in FIG. 2, this darts panel 1 has a sloped wall 1a extending rearward as it goes downward, as shown in FIG.
An upright wall 1b extends substantially perpendicularly upward from the upper end of the inclined wall 1a, and a horizontal portion 1c extends rearward from the lower end of the inclined wall 1a.

At the lower end of the darth panel 1, as shown in FIG.
A cross member 2 as shown in FIG. 3 is joined, and this cross member 2 cooperates with the dash panel 1 to form a closed cross section. This cross member 2 extends in the vehicle width direction, and its left and right ends are respectively joined to side sills 3 (see Figure 1).
As is clear from the figure, a rear extension portion 2a is formed which extends rearward and has a substantially U-shaped cross section.

A front frame 4 extending in the front-rear direction is disposed in front of the dash panel 1. This front frame 4 is joined to the lower end of a wheel apron 5 (see FIG. 3) constituting the side wall of the engine room using its joint flange portion 4a, and cooperates with the wheel apron 5 to close. It constitutes a cross section. A joining flange portion 4b formed at the rear end of the front frame 4 is joined to the front surface of the dash panel 1.

At the rear of the dash panel 1, a floor frame 6 having a substantially U-shaped cross section extending in the front-rear direction is provided. This floor frame 6
is joined to the lower surface of the floor panel 7 using the joining flange portion 6a, and cooperates with the floor panel 7 to form a closed cross section. The front end portion of the floor panel 7 is overlapped with the rear end portion of the horizontal portion 1c of the dash panel 1 so as not to form a step. That is, the horizontal portion 1c of the dash panel 1 constitutes a part of the floor panel.

Reference numeral 8 in FIG. 1 denotes a joint member, and as shown in FIG. 2, this joint member 8 penetrates the closed section formed by the cross member 2 in the front-rear direction. Such a joint member 8 is
As shown in FIG. 3, the cross section is approximately U-shaped,
It connects the front frame 4 and the rear extension 2a of the cross member 2. That is, the front end 8a (joint flange) of the joint member 8 is inserted into the rear end of the front frame 4 and joined to the front frame 4, and the rear end 8b of the joint member 8 is extended rearward. It is joined to the rear extension part 2a while being fitted into the front part of the part 2a. Further, the joint member 8 is joined to the lower surface of the cross member 1 using a joining flange portion 8c formed over almost its entire length.

On the other hand, the floor frame 6 has a front end 6
b is joined to the rear extension part 2a in a state where it is fitted onto the rear outer periphery of the rear extension part 2a.

Note that a relief portion 2b for passing the joint member 8 is formed at the upper end edge of the cross member 2 (see FIG. 3), and a step is formed between the lower surface of the rear extension portion 2a and the lower surface of the floor frame 6. They are superimposed so that they do not overlap (see Figure 2).

With the above configuration, vibrations from the engine etc. and the rear load in the event of a frontal collision are transmitted from the front frame 4 to the floor frame 6 via the joint member 8 and the rear extension 2a of the cross member 2. distributed. As a result, vibrations and rear loads are also absorbed by the floor frame 6. In particular, the long rear extension 2a
On the other hand, since the joint member 8 and the floor frame 6 are connected by joining using fitting, the strength of this connection is strong, and the vibration and load from the front frame 4 mentioned above can be absorbed by the floor frame 6 alone. It is possible to effectively transmit and disperse the information to the cross member 2 as well.

Here, the assembly may be performed, for example, as follows. That is, the front frame 4 and the joint member 8 are joined together, and the floor frame 6 and the floor panel 7 are joined in advance. Thereafter, the cross member 2 is assembled and joined to the joint member 8, the dart panel 1 is assembled and joined to the joint member 8 and the cross member 2, and finally the floor frame 6 and the floor panel 7 are assembled and joined. All you have to do is assemble and join the joints.

(Effects of the invention) As is clear from the above, the invention has the following effects:
Vibrations and loads from the front frame can be effectively transmitted and dispersed not only to the floor frame but also to the cross member. In particular, the strength of the connection between the front frame, cross member, and floor frame via the joint member is high, which not only makes it possible to more effectively transmit and distribute the vibrations and loads mentioned above, but also increases the rigidity around the lower end of the darts panel. will also be greatly improved.

Moreover, no particular trouble will occur during assembly.

[Brief explanation of the drawing]

FIG. 1 is a top perspective view showing one embodiment of the present invention.
Figure 2 shows the first joint along the longitudinal direction of the joint member.
A side cross-sectional view of the figure. FIG. 3 is an exploded perspective view of the main components of the present invention. 1: Dashboard panel, 2: Cross member, 2
a: rear extension, 4: front frame, 6: floor frame, 6a: front end, 7: floor panel, 8: joint member, 8a: front end, 8
b: Rear end.

Claims (1)

[Scope of Utility Model Registration Claim] The front frame is placed in front of the darts panel that partitions the engine room and the passenger compartment, and extends in the front-rear direction to form a closed section. In the lower body structure of an automobile, comprising a floor frame forming a closed cross section, and a cross member joined to the lower end of the dash panel and extending in the vehicle width direction to form a closed cross section, the cross member has a cross section extending rearward. Stretched and cross section abbreviated to U
A joint member having a substantially U-shaped cross section is disposed so as to penetrate in the front-back direction within the closed cross section formed by the cross member, and a joint member having a substantially U-shaped cross section is disposed so as to penetrate in the front and rear direction within the closed cross section formed by the cross member. A front end portion is joined to the front frame, a rear end portion of the joint member is joined to the front portion of the rear extension portion in a fitted state, and a front end portion of the floor frame is joined to the rear portion of the rear extension portion. A lower body structure of an automobile, characterized in that the lower body structure is joined in a fitted state.