JPH044947Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the front body structure of an automobile, and in particular relates to the structure of the joint between a cross member that is bonded and fixed to the toe board and a frame that is bonded and fixed to the wheel apron. It is.

Conventional technology The front part of an automobile body consists of a frame with an almost hat-shaped cross section that is fixed to the left and right wheel aprons, which form the left and right side walls of the engine room, and the lower part of the toe board that separates the engine room from the passenger compartment behind it. Usually, the rear end of the frame is fixedly connected to a cross member that is fixedly connected to the cross member (for example, see Japanese Utility Model Application Publication No. 58-39377).

Problems to be Solved by the Invention The joint between the frame and the cross member is generally made by widening the rear end of the frame with a hat-shaped cross section and bending it downward, so that the rear edge and the lower edge are aligned toward the center of the vehicle body. The rear edge flange and the lower edge flange facing each other are continuously drawn and formed, and one end is joined and fixed to the wheel apron, and the other end is joined to the lower edge flange to close the rear lower end of the frame. In addition to providing a reinforcement, a second reinforcement is provided, the front end of which is narrowly fixed to the joint and fixed part of the frame and the wheel apron, the middle part of which is joined and fixed to the inner surface of the frame, and the lower end of which is fixed and fixed to the first reinforcement. The rear end of the reinforcement is bonded and fixed to the toe board, the left and right ends of the cross member are bonded and fixed to the second reinforcement, and the rear edge flange of the frame is conveniently fixed to the cross member. It is normal to have one.

However, as mentioned above, the conventional structure in which the frame and cross member are connected by the first reinforcement that closes the rear lower end of the frame and the second reinforcement that is simply bonded and fixed to the inner surface of the frame is , the problem is that both the joint stiffness and the lateral stiffness are insufficient.

The main purpose of the present invention is to improve the joint rigidity of the joint between the frame and the cross member without increasing the number of parts, and also to improve the lateral rigidity.

Means for Solving the Problems The present invention combines a frame that is bonded and fixed to the wheel apron and a cross member that is bonded and fixed to the toe board with the first reinforcement and frame that connect the wheel apron and the lower end of the frame. In a front body structure of an automobile that is connected using a second reinforcement that connects a first reinforcement and a toe board, a bulge that bulges toward the center of the vehicle body is formed at the lower rear part of the frame. The bulge, the first and second reinforcements, and the cross member have a structure in which a closed section having a substantially triangular cross section is formed at the joint between the frame and the cross member.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In the figure, 1 is a wheel apron that serves as the side wall of the engine room, and 2 is a frame with an approximately hat-shaped cross section that is bonded and fixed to the inner surface of the wheel apron 1, with the rear end of the frame 2 facing downward. The wide portion 21 has a wide portion 21 that is curved inwardly, and a trailing edge flange 22 and a lower edge flange 23 facing toward the center of the vehicle body are continuously formed on the rear edge and lower edge of the wide portion 21.

Reference numeral 3 denotes a toe board that partitions the engine room from the vehicle compartment behind it, and a cross member 4 is fixedly bonded to a bent portion of the lower edge of the toe board 3.

5, as shown in FIG.
This is a first reinforcement which is bonded and fixed to the lower edge flange 23 of the frame 2 to close the lower end of the wide portion 21 of the frame 2, and whose rear end is bonded and fixed to the lower surface of the cross member 4.

As shown in FIG. 3, 6 has a rear end portion 62 whose front end portion 61 is sandwiched and fixed between the joint portion between the front edge flange 24 of the wide portion 21 of the frame 2 and the wheel apron 1.
is a second reinforcement which is bonded and fixed to the toe board 3 and its intermediate portion is bonded and fixed to the inner surface of the wide part 21 of the frame 2, and the lower part 63 of the second reinforcement 6 is shown in FIG. As shown, it is bonded and fixed to the first reinforcement 5.

Further, the side end portion 41 of the cross member 4 is bonded and fixed to the second reinforcement 6 as shown in FIG. 3, and the trailing edge flange 22 of the wide portion 21 of the frame 2 is bonded and fixed to the cross member 4. Ru.

In the above, the rear lower part of the wide part 21 of the frame 2 has a rear bulge part 21a that gradually bulges toward the center of the vehicle body as it goes rearward, and a rear bulge portion 21a that gradually bulges toward the center of the vehicle body as it goes downward. A lower bulging portion 21b is formed continuously, and a first reinforcement 5 and a second reinforcement 6 are formed at the joint between the wide portion 21 of the frame 2 and the cross member 4.
and the lower bulging portion 21 of the wide portion 21 of the frame 2.
b forms a closed section A having a substantially triangular cross section (see Fig. 2), and the second reinforcement 6, the cross member 4, and the rear bulge 21a of the wide portion 21 of the frame 2 form a closed section A having a substantially triangular cross section. The structure is such that a substantially triangular closed section B (see FIG. 3) is formed continuously with the closed section A.

Incidentally, the rear end portion 11 of the wheel apron 1 is bonded and fixed to the side surface portion of the toe board 3, as shown in FIG.

Effects of the Invention In the present invention configured as described above, the rear end of the frame 2 which is bonded and fixed to the wheel apron 1 and the cross member 4 which is fixed to the toe board are connected to the lower rear end of the frame 2 and the wheel apron 1. first reinforcement 5 and frame 2 that connect
bulging parts 21a and 21 which bulge out toward the center of the vehicle body at the rear lower part of the frame 2 in the case where the second reinforcement 6 is used to connect the rear part of the frame 2, the first reinforcement 5, and the cross member 4.
By forming the section b, closed section sections A and B having a substantially triangular cross section are continuously formed at the connection section between the rear end of the frame 2 and the cross member 4.
As shown by chain lines 2' and 2'' in the figure, compared to the case where the second reinforcement 6 is simply superimposed on the inside of the frame 3, it is possible to connect it without adding new parts such as a gusset. It is possible to enlarge the cross section of the part, distribute stress, and significantly improve the joint rigidity, and not only can the lateral rigidity of the front body be significantly improved, but also the draw forming of the trailing edge flange and lower edge flange of the frame 2 can be done. The above-mentioned bulging parts A and B make it considerably easier to form the frame, and the formability of the frame can also be improved.This, together with the fact that there is no increase in weight and is advantageous in terms of cost, has a great practical effect. It is possible to bring about

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts showing an embodiment of the present invention;
2 is a sectional view taken along the line XX in FIG. 1, and FIG. 3 is a sectional view taken along the line YY in FIG. 1...Wheel apron, 2...Frame, 2
1... Wide portion, 22... Trailing edge flange, 23...
Lower edge flange, 24... Front edge flange, 21a,
21b...bulge, 3... toe board, 4... cross member, 5... first reinforcement, 6
...Second reinforcement, A, B...Closed section.

Claims (1)

[Scope of utility model registration request] The rear part of the frame that is bonded and fixed to the wheel apron and the cross member that is bonded and bonded to the toe board are connected to the first reinforcement that connects the wheel apron and the lower end of the frame, and the frame that is bonded and fixed to the inside of the frame. A second reinforcement connects the reinforcement and the cross member.
In the case where the frame is connected using a stent, there is a bulge part at the rear lower part of the frame that gradually bulges out toward the center of the vehicle body as it goes toward the rear end, and a bulge that gradually bulges out toward the center of the vehicle body as it goes toward the bottom end. The structure has a structure in which the first and second reinforcements, the cross member, and the two continuous bulges of the frame form a closed section having an approximately triangular cross section. A front body structure of an automobile characterized by: