JPH0517348Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a front body structure of an automobile, particularly to a reinforcement structure for a connecting portion between a side sill and a front side frame.

(Prior Art) A side sill with a closed cross section extending in the longitudinal direction of the vehicle body is provided at the side end of the passenger compartment, and a front side frame with a closed cross section extending in the longitudinal direction of the vehicle body is provided in front of the side sill. Generally, the front side frame is offset upwardly from the side sill. Therefore, a connecting frame is provided between the two to connect the front end of the side sill and the rear end of the front side frame. This connection frame is designed to form a closed cross section with the dash panel etc. to ensure strength.
This alone is still not sufficient in terms of strength. On the other hand, if a reinforcement as disclosed in Japanese Utility Model Application Publication No. 59-142179 is provided in the connecting frame, it is possible to improve the strength to some extent.

(Problem to be solved by the invention) However, considering that the connecting part between the side sill and the front side frame is located at the front of the vehicle interior, it is necessary to improve its strength from the viewpoint of protecting the occupants of the vehicle interior in the event of a vehicle collision. It is hoped that it will improve. Further, a suspension cross member that supports the suspension device is provided below the front side frame, but when this suspension cross member is supported by the front side frame, etc., input from the suspension cross member is provided. It is desirable to ensure sufficient strength to withstand loads.

The present invention was developed in view of the above circumstances, and it is an object of the present invention to provide a front body structure for an automobile that can improve safety in the event of a vehicle collision and improve support strength for the suspension cross member. It is something to do.

(Means for Solving the Problems) In the front body structure of an automobile according to the present invention, the suspension cross member is connected to the vehicle body near the rear end of the front side frame and near the rear end of the connection frame. By doing this, the suspension cross member, front side frame, and connecting frame form a closed system with continuity in terms of strength.Furthermore, by using reinforcement that reinforces the connecting frame, the suspension cross member and front The above objective is achieved by also reinforcing each connecting portion with the side frame and the connecting frame. That is, a side sill with a closed cross section extending in the longitudinal direction of the vehicle body is provided at the side end of the passenger compartment, and a closed cross section extending in the longitudinal direction of the vehicle body is provided in front of the side sill and offset upward from the side sill. a front side frame, a connecting frame that connects the front end of the side sill and the rear end of the front side frame, and a connecting frame connected to the vicinity of the rear end of the front side frame and the rear end of the connecting frame, respectively. a suspension cross member extending in the vehicle width direction, a front end portion of which is connected to the inner surface of the front side frame to reinforce a connecting portion of the front side frame to the suspension cross member, and a rear end portion of which is connected to the side sill. and a reinforcement that is connected to the connecting frame and forms a closed cross section with the connecting frame at least at a connecting portion near the rear end of the connecting frame and the suspension cross member. be.

The above-mentioned "connection frame" may have a closed cross section or an open cross section as long as it has sufficient strength to achieve the above purpose when the front body structure shown in the above configuration is adopted. In the case of a closed cross-sectional shape, the connecting frame itself may be formed in a closed cross-sectional shape, or the connecting frame and another member such as a dash panel may be formed in a closed cross-sectional shape.

The above "reinforcement" is connected to the "inner surface of the front side frame" and the "side sill", but the "inner surface of the front side frame"
does not necessarily have to be the back side of the outer surface of the front side frame to which the suspension cross member is connected, but can be placed inside the front side frame as long as it is possible to reinforce the connection between the suspension cross member and the front side frame. It may be connected to any part of the side sill, and the connection to the "side sill" may be made to either the inner or outer surface of the side sill.

(Function) As shown in the above configuration, the suspension cross member is connected to the vehicle body near the rear end of the front side frame and near the rear end of the connection frame, so these three members maintain continuity in terms of strength. Therefore, the front side frame, the connecting frame, and the suspension cross member are in a mutually reinforcing relationship. In addition, near the rear end of the connection frame to which the suspension cross member is connected, the connection frame and reinforcement form a closed section, which improves the support strength for the suspension cross member. On the other hand, the vicinity of the rear end of the front side frame to which the suspension cross member is connected is reinforced with reinforcement in addition to the front side frame formed in a closed cross-section, so that the suspension cross member is The support strength will be improved. Furthermore, the suspension cross member is connected near the rear end of the front side frame and near the rear end of the connecting frame, so the input load from the suspension cross member is efficiently distributed to the front side frame and side sills. It happens.

(Effects of the invention) Therefore, according to the invention, the strength of the vehicle body at the connecting portion between the side sill and the front side frame is improved, so that the load at the time of a vehicle collision is smoothly transmitted from the front side frame to the side sill, and the above-mentioned It is possible to prevent stress from concentrating on the connecting portion, improving the safety of occupants in the vehicle interior, and also improving the support strength for the suspension cross member.

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

1 and 2 are a side view and a plan view showing an embodiment of the front body structure of an automobile according to the present invention, and are views showing the portion shown in FIG. 3 in detail.

As shown in FIG. 3, a side sill 2 with a closed cross section that extends in the longitudinal direction of the vehicle body is provided at the side end of the passenger compartment 1, and in front of this side sill 2 is a side sill 2 that extends in the longitudinal direction of the vehicle body with a dash panel 3 in between. A front side frame 4 having a closed cross section is provided.

As shown in FIGS. 1 and 2, the front side frame 4 is provided offset upwardly and inwardly in the vehicle width direction with respect to the side sill 2, and a connecting frame 5 connects the front end of the side sill 2 with the front side frame. 4 is connected to the rear end. The connecting frame 5 is formed to have a U-shaped cross section, and is joined to the dash panel 3 so as to form a closed cross section together with the dash panel 3.

A suspension cross member 6 extending in the vehicle width direction is provided below the front side frame 4. This suspension cross member 6
is connected to the vicinity of the rear end of the front side frame 4 and the vicinity of the rear end of the connecting frame 5. The connection to the connecting frame 5 is made by fastening bolts 8 to weld nuts 7 fixed to the connecting frame 5, while the connection to the front side frame 4 is made by tightening bolts 8 from the front side frame 4 downward. 10 protruding bolts and 1 nut
This is done by entering into 1.

As shown in FIG. 4, which is a sectional view taken along the line - in FIG.
A first reinforcement 12 having a U-shaped cross section is welded to the inner surface of the front side frame 4. 1st reinforcement 12
By fastening the bolt 10 to a weld nut 13 fixed to the suspension cross member 6, the support strength of the bolt 10 to the suspension cross member 6 is increased.

As shown in FIG. 1, the first reinforcement 12 is provided so as to extend toward the rear of the vehicle body within the front side frame 4 with the portion to which the weld nut 13 is fixed as the front end, and extends into the connection frame 5. ing. The front end of the second reinforcement 14 is superposed and welded to the rear end of the first reinforcement 12 . This second reinforcement 14 has a rear end portion welded to the side sill 2. The connecting frame 5 is reinforced by these first and second reinforcements 12 and 14.

Further, as shown in FIG. 5, which is a sectional view taken along the line - in FIG.
The connecting frame 5 and the side sill 2 form a closed section. Therefore,
The vicinity of the rear end of the connection frame 5 to which the suspension cross member 6 is connected is sufficiently reinforced by the second reinforcement 14.

As shown in FIG. 1, the suspension cross member 6 is located below the steering tie rod 15 disposed near the front of the dash panel 3, so it is connected to the vehicle body so as to surround the steering tie rod 15. , a closed quadrangular system is formed around the steering tight 15 by the front side frame 4, the connection frame 5, and the suspension cross member 6. This creates a structure in which the front side frame 4, the connection frame 5, and the suspension cross member 6 mutually reinforce each other. The load input to the suspension cross member 6 from the suspension device (not shown) is
It is efficiently distributed between the front side frame 4 and the side sill 2 via the connecting frame 5.

Further, as is clear from FIG. 1, the first reinforcement 12 is in contact with the lower surfaces of the front side frame 4 and the connecting frame 5 except for the overlapped portion with the second reinforcement 14, whereas the second The reinforcement 14 and the connecting frame 5 form a closed cross section. Therefore, the first reinforcement 12
The strength of the vehicle body is higher in the part reinforced with the second reinforcement 14 than in the part reinforced with the second reinforcement 14. Therefore, when the vehicle receives an impact load in the longitudinal direction such as during a vehicle collision, if the load is below a predetermined value, the front side frame 4 is The input load from the side sill 2 is transmitted to the side sill 2, thereby preventing the vehicle body from deforming; however, if the load exceeds a predetermined value, the vehicle body will undergo compressive deformation in stages. That is, the second reinforcement 14 is arranged in a part of the vehicle body that is close to the occupant in the vehicle interior 1.
Since the reinforcing effect is greater, this is advantageous in terms of ensuring the safety of the occupants.

[Brief explanation of the drawing]

Fig. 1 is a side view of Fig. 3 showing an example of the front body structure of an automobile according to the present invention, and Fig. 2 is a side view of the part shown in Fig.
3 is a perspective view showing the vehicle body part to which the structure is applied, FIG. 4 is a sectional view taken along the line -- in FIG. 1, and FIG. 5 is a sectional view taken along the line -- in FIG. 2. . 1... Vehicle interior, 2... Side sill, 4... Front side frame, 5... Connection frame, 6...
Suspension cross member, 12...first reinforcement, 14...second reinforcement.

Claims (1)

[Scope of utility model registration request] A side sill with a closed cross section extending in the longitudinal direction of the vehicle body is provided at the side end of the passenger compartment, and a front with a closed cross section extending in the longitudinal direction of the vehicle body is provided in front of the side sill and offset upward from the side sill. a side frame, a connection frame that connects a front end of the side sill and a rear end of the front side frame, and a vehicle connected to the vicinity of the rear end of the front side frame and the rear end of the connection frame, respectively. A suspension cross member extending in the width direction, a front end portion of which is connected to the inner surface of the front side frame to reinforce a connection portion of the front side frame with the suspension cross member, and a rear end portion of which is connected to the side sill. and a reinforcement that forms a closed cross section with the connecting frame at least at a connecting portion between the rear end of the connecting frame and the suspension cross member. Part car body structure.