JPH0626468Y2 - Car front body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a front body structure of an automobile in which side members having a closed cross-section with front ends opened are arranged on both sides of the body.

(Prior Art) In general, a front body of an automobile has side members (A) having a closed cross-section with a front end opened on both sides of the body as schematically shown in FIG. 7, for example. An end of a cross member (B) having a closed cross section is joined to the lower surface of the front end of (A) by welding, while a bumper stay (D) extending rearward from the front bumper (C) is
From the front end opening of the side member (A) to the member (A)
It is inserted into the inside, and the inserted end is bolted to the side member (A).

(Problems to be Solved by the Invention) In the front body having the above structure, since the front end of the side member (A) is open, muddy water or the like easily enters the inside of the side member (A), This is a cause of rusting, and the bonding strength between the side member (A) and the cross member (B) is weak. Therefore, conventionally, it is separately formed at the bonding site of both the members (A) and (B). Although the reinforcement strength is increased by assembling the reinforcing member, the additional reinforcement member has a disadvantage that the number of parts and the vehicle weight increase accordingly.

The present invention was developed in view of the above circumstances, and an object thereof is to reliably close the front end opening of the side member and effectively utilize the closing member of the opening to support the bumper and the side. It is an object of the present invention to provide a front body structure that efficiently enhances the rigidity of the connecting portion between the member and the cross member and at the same time sufficiently secures the torsional rigidity of the vehicle body, while efficiently transmitting the energy absorption at the time of a frontal collision of the vehicle.

(Means for Solving the Problems) However, the present invention provides a cross member that is connected to the lower surface of the front end portion of a side member in a vehicle in which side members having a closed cross-section whose front end is open are arranged on both sides of the body. ,
The side member is coupled at a position displaced rearward by a predetermined distance from the front end of the side member, and at the front end of the side member, a closing plate for closing the front end opening of the side member is fixed, and the mounting shaft of the bumper is attached to the plate. Along with the provision, the lower end side of the closing plate is extended rearward, and the extension is fixed to the cross member.

(Operation) According to the present invention, the front end opening of the side member is closed by the closing plate to prevent intrusion of muddy water and the like into the side member. The bumper can be securely assembled to the shaft, and moreover, since the cross member is coupled at a position displaced rearward by a predetermined distance from the front end of the side member, the cross member is coupled to the front end of the side member. Compared to the case in which the vehicle body has a higher torsional rigidity, the front end of the side member that protrudes further forward than the cross member efficiently buckles during a vehicle front collision, and the collision load absorption performance is improved. Further, the side member and the cross member are coupled by the closing plate and an extension portion provided on the plate, and the coupling strength of both members is enhanced. To do.

(Embodiment) A front body structure of an automobile according to the present invention will be described below with reference to an embodiment shown in the drawings.

The front body shown in the figure is basically a side member (1) disposed in the front-rear direction on both sides of the front part of the body.
A cross member (2) having a closed cross section disposed in the front portion of the body in the vehicle width direction; and a front bumper (3) disposed in front of the cross member (2) in the vehicle width direction.
It has and.

The side bumper (1) has a hollow quadrangular cross section with an open front end, and in the embodiment shown in the drawings, includes an upper wall (11) and an inner wall (12), and is open downward and outward in the vehicle width direction. A connecting piece (13) having an inverted L-shape in cross section is connected to the front end of the side bumper (1), and an extension that covers the outside of the connecting piece (13) in the vehicle width direction. A panel (14) is separately formed, and a welding flange (14a) is provided on the upper edge of the extension panel (14).
Is fixed to the outer end of the upper wall (11) of the connecting piece (13) in the vehicle width direction by spot welding, and the welding flange (14b) provided at the rear edge of the extension panel (14) is attached to the side. Outer wall (15) of member (1)
It is fixed to the front end by spot welding.

The cross member (2) is a member body (2) having an inverted U-shaped cross section.
1) and a closing plate (22) that closes the lower opening of the member body (21), the cross member (2) is arranged in the vehicle width direction at the front part of the body, and the upper surfaces of both end parts are The welded flange (23) provided at the tip of the cross member (2) is welded to the rear portion of the inner side wall (12) of the connecting piece (13) and spot welded to the rear portion of the inner side surface of the extension panel (14). It is stuck in.

Thus, the front end of the side member (2), that is, the portion where the connecting piece (13) is formed is also the upper wall (1) of the connecting piece (13).
1), the inner wall (12), the extension panel (14) and the upper wall of the cross member (2) have a hollow rectangular cross section, and the cross member (2).
Are arranged at positions displaced rearward by a predetermined distance from the front end of the side member (2).

In the above front body, a closing plate (4) for closing the front end opening of the side member (2) is fixed to the front end portion of the side member (2), and a bumper (4) is attached to the closing plate (4). ) Mounting shaft (5) is provided, and the lower end of the closing plate (4) is extended rearward,
The extension (41) is fixed to the cross member (2).

Specifically, a substantially rectangular closing wall portion (40) capable of closing the front end opening of the side member (2), and the extension portion (41) extending rearward from the lower edge of the closing wall portion (40). A closing plate (4) consisting of a first welding flange (42) at the upper edge of the closing wall (40) and a second welding flange (43) at the inner edge of the closing wall (40). To
Further, a third welding flange (4
4) is connected to the inner edge of the extension portion (41) with a fourth welding flange (45), respectively, while the closing wall portion (4)
The mounting shaft (5) is in contact with the center of (0).

The above closing plate (4) applies the closing wall portion (40) to the front end of the connecting piece (13), and puts the first welding flange (42) on the connecting piece (13). The second welding flange (43) and the fourth welding flange (45) are provided on the wall (11) on the inner side wall (1) of the connecting piece (13).
The third welding flanges (44) are fixed to the front side wall (23) of the cross member (2) by spot welding, respectively.

On the other hand, the front bumper (3) includes a resin bumper body (31) and a reinforcement (32) that holds the bumper body (31).
Is a through hole (3) formed in the reinforcement (32).
The mounting shaft (5) is inserted through the mounting shaft (3), and a nut (50) is screwed onto the mounting shaft (5) to fix the side member (1) to the front end.

Further, in the embodiment shown in the drawings, a separately formed gusset plate (6) is attached to the connecting portion of the side member (1) and the cross member (2). The lower edge of the plate (6) is fixed to the upper portion of the cross member (2) by spot welding, and the outer edge of the gusset plate (6) is connected to the connecting piece (1).
3) It is fixed to the upper wall (11) and the inner wall (12) by spot welding.

Incidentally, (7) in the figure shows a radiator support.

(Effects of the Invention) As described above, according to the present invention, the front end opening of the side member is closed by the closing plate to prevent muddy water and the like from entering the side member. While the bumper can be surely assembled to the mounting shaft provided in, the side member and the cross member are coupled through the closing plate, and the coupling strength of both members can be sufficiently increased. Moreover, since the cross member is connected at a position displaced rearward by a predetermined distance from the front end of the side member, the torsional rigidity of the vehicle body is increased as compared with the case where the cross member is connected to the front end of the side member. The front end of the side member, which is able to do so and which protrudes further forward than the cross member, efficiently buckles during a vehicle frontal collision, and absorbs the collision load. Can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of a front body structure according to the present invention, FIG. 2 is an exploded perspective view of the same, and FIG.
4 and 5 are cross-sectional views of a main part, FIG. 6 is an explanatory view of an automobile adopting the front body structure of the present invention, and FIG. 7 is a schematic perspective view showing an example of a conventional front body structure. (1) …… Side member (2) …… Cross member (3) …… Bumper (4) …… Closed plate (41) …… Extended part

Claims (1)

[Scope of utility model registration request] 1. In an automobile in which side members having a closed cross-section whose front end is open are disposed on both sides of a body, a cross member connected to a lower surface of a front end of the side member is spaced a predetermined distance from the front end of the side member. A closing plate for closing the front end opening of the side member is fixed to the front end of the side member while being coupled at a position displaced rearward, and a mounting shaft for a bumper is provided on the plate, and a lower end side of the closing plate. Is extended rearward, and the extension is fixed to the cross member.