JPH0744537Y2 - Car body front structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a vehicle body front structure.

2. Description of the Related Art At the foremost end of the engine room formed in the front part of the vehicle body of an automobile, the left and right radiator panel sides are joined to the front edge of the left and right wheel aprons that form the left and right side walls of the engine room and the wheel apron. The left and right radiator panel sides are joined and fixed to the front end edges of the left and right fixed side frames, and the upper and lower sides of the radiator panel side are connected by a radiator panel upper and a front cross member, respectively, and the left and right radiator panel sides and the radiator panel upper are connected. It is usual to have a structure in which a radiator for cooling engine cooling water and a condenser for an air conditioner are arranged in a space surrounded by a front cross member (for example, see Japanese Utility Model Laid-Open No. 59-92067). .

As shown in FIG. 8, the bumper b is joined and fixed along the lower edge of the wheel apron, and the front end of the side frame a for mounting and supporting the bumper b has the bumper near the front end. In order to transmit a collision input from a front cross member c which is located below b and which mounts and supports a radiator (not shown), the cross-sectional area formed between the side frame a and the substantially U-shape is gradually formed. A small bracket d is attached to the side frame a, and a base end portion of a lower arm of a strut type wheel suspension device shown in the figure is provided between the side frame rear portion f and a substantially central portion in the front-rear direction. In the case where the sub-frame e which supports so as to be vertically swingable is screwed and fixed by the bolt g, it is provided on the side frame a. Both of the lymph augmentation front h and the lymph augmentation rear i, which are provided on the inner side surface of the side frame a as shown in FIGS. 8 (a) and 8 (b), do not form a node plate. By a collision input from the bumper b or the front cross member c, the front portion of the side frame a, that is, the front portion from the vicinity of the central portion which is the attachment portion of the sub frame e to the side frame a is bent or strut type wheels. The bolt g for fixing the front end of the sub-frame e to the side frame a may fall down and be deformed by an input from the lower arm attachment portion of the suspension device.

The present invention addresses such a problem.

Means for Solving the Problems The present invention is directed to a lower surface of a substantially U-shaped side frame joined and fixed to a lower edge portion of an inner side surface of a wheel apron, which is inclined downward toward a front side from a vicinity of a central portion in a vehicle body front-rear direction. And a horizontal plane that is continuous with the inclined surface and has a horizontal surface that is substantially the same height as the lower surface of the front cross member that is joined and fixed to the front end portion of the wheel apron, and
The front end of a subframe for supporting a wheel suspension device, which is arranged between a lower surface of the side frame near the center in the vehicle front-rear direction and a side frame rear joined and fixed to a rear end of a wheel apron, and the side. It is characterized in that a reinforcing member for connecting the rear end of the horizontal surface of the lower surface of the frame in a substantially horizontal direction is provided.

Action As described above, since the initial vehicle body drag force can be made sufficiently high and the work amount due to the initial vehicle body drag force can be increased, the peak value of the vehicle body deceleration that occurs thereafter can be lowered, and the running stability can be enhanced by improving the vehicle body rigidity. Further, by improving the proportion of collision input sharing by the subframe, the cross-sectional area of the rear portion of the side frame can be reduced, and the area of the opening surrounded by the side frame and the subframe for passing the axle shaft can be made sufficiently large. .

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, 1 is a wheel apron that constitutes the left and right side walls of the engine room, and 2 is a side frame that has a substantially U-shaped cross section and is joined and fixed along the lower edge of the inner side surface of the wheel apron 1. 3 is a side frame rear for transmitting the force from the front part of the vehicle body to the toe board and the floor, 4 is a radiator panel side that is fixedly joined to the front end of the wheel apron 1, and the radiator panel side 4 is not shown in its upper part. The lower part is connected by a radiator panel upper and the lower part is connected by a front cross member 5 having a box-shaped cross section, and the left and right radiator panel sides 4, the radiator panel upper and the front cross member 5 are connected.
A heat exchanger such as a radiator for cooling engine cooling water or a condenser of an air conditioner, which is not shown, is arranged in a space surrounded by.

The side frame 2 having the U-shaped cross section has an inclined surface 2a whose lower surface descends toward the front of the vehicle body from the vicinity of the central portion in the vehicle front-rear direction, and a front cross member having the box-shaped cross section connected to the inclined surface 2a. 5 has a horizontal surface 2b having substantially the same height as the lower surface of 5, and inside the side frame 2 there is provided a reinforcement 6 consisting of a front reinforcement 7 and a rear reinforcement 8. As shown in FIG. 3 and FIG. 4, the reinforcement 6 has the same height as the height of the side frame 2 near the central portion in the vehicle front-rear direction.
The vertical surface 7a bonded and fixed to the inner surface of the vehicle and the lateral surface 7b having the same length as the width of the side frame 2 in the vehicle body width direction have an inverted L shape.
The upper flange 7c, which is formed in a V shape and is provided substantially horizontally at the outer upper edge of the vertical surface 7a, is sandwiched and fixed by being joined to the joint between the wheel apron 1 and the side frame 2. A lower flange 7d provided substantially vertically on the inner lower edge of the surface 7b is fixedly joined to the inner surface of the side frame 2 to form a substantially horizontal joint plate, and the front reinforcement 7 and FIGS. As shown in the figure, the side frame 2 having the substantially U-shaped cross section has a U-shaped cross section formed so as to be bonded and fixed to the inner side surface of the side frame 2 from the vicinity of the substantially central portion in the vehicle front-rear direction to the rear side. The rear end face of the vertical surface 7a of the front phosphorus reinforcement 7 which is composed of the rear phosphorus reinforcement 8 and is fixedly joined to the inner side surface of the wheel apron 1, and the rear side which is joined to the inner side surface of the side frame 2. The front end surface of the vertical surface 8a of the reinforcement 8 is joined and fixed to each other so as to form a vertical node plate.

Reference numeral 9 is a sub-frame for supporting the lower arm of a lower arm of a strut type wheel suspension device (not shown) so as to be vertically swingable, and its front end is screwed to the lower surface of the side frame 2 in the vicinity of the center of the vehicle body front and rear. 9a is screwed and fixed, and its rear end is screwed and fixed to the reinforcing bracket 3a that is joined and fixed to the lower portion of the side frame rear 3.

The front end of 10 is the inclined surface portion 2a of the side frame 2 described above.
Is attached to the bottom surface of the reinforcing bracket 2c joined and fixed to the lower surface of the side frame 2 with the two screws, and the rear end of the sub frame 9 is fastened together with the screw 9a for fixing the front end of the side frame 2 to the side frame 2. A reinforcing plate which is substantially flush with the horizontal surface 2b of the front portion, and the collision input from the front cross member 5 and the bumper 11 which are joined and fixed to the front ends of the wheel apron 1 and the side frame 2 by the reinforcing plate 10 is received by the sub-frame 9 It is configured to be distributed to the side frame rear 3 via.

6 (a) is a bottom view of the reinforcing plate 10.
FIG. 6B is a sectional view taken along line FF of FIG. 6A.

Due to the above, the conventional device as shown in FIG. 8 bends the front half of the side frame a due to the collision input from the bumper b or the front cross member c, and the initial vehicle body drag force as shown in FIG. However, the peak value of the deceleration of the vehicle body that occurs after that is inevitably high because the work load (shown by the hatch) cannot be sufficiently high. Since the vehicle body drag force can be made sufficiently high and the work amount by the initial vehicle body drag force can be increased, the peak value of the vehicle body deceleration that occurs thereafter can be lowered, and the reinforcing plate 10 is screwed to the side frame 2 at the front end portion of the sub-frame 9. Since the lower end of the screw 9a that supports the screw 9a is supported, both ends of the screw 9a are supported, and when the subframe 9 is firmly attached to the side frame 2, the rigidity of the vehicle body is increased and the rigidity of the wheel suspension device is increased. In addition to improving the running stability, the cross-sectional area of the rear portion of the side frame 2 is reduced by increasing the proportion of the collision input of the sub frame 9 and the axle frame (not shown) surrounded by the side frame 2 and the sub frame 9 is passed through. The area of the opening 12 can be made sufficiently large.

As described above, according to the present invention, the lower surface of the side frame having a substantially U-shaped cross section, which is joined and fixed to the lower edge of the inner side surface of the wheel apron, faces forward from the vicinity of the central portion in the vehicle longitudinal direction. A structure having a descending inclined surface and a horizontal surface having substantially the same height as the lower surface of the front cross member connected to the inclined surface and joined and fixed to the front end of the wheel apron, and the vehicle body of the side frame. The front end of the sub-bracket for supporting the wheel suspension device arranged between the lower surface near the center in the front-rear direction and the side frame rear joined and fixed to the rear end of the wheel apron and the horizontal plane of the lower surface of the side frame. By providing a reinforcing member that connects the rear end portion in a substantially horizontal direction, the initial vehicle body drag force is sufficiently increased and the work amount due to the initial vehicle body drag force is increased. Since it is possible to reduce the peak value of the vehicle deceleration that occurs thereafter, the reinforcing plate 10 supports the lower end of the screw 9a for fixing the front end of the sub-frame 9 to the side frame 2, so that the screw 9a has both ends. Since the sub-frame 9 is supported firmly and the sub-frame 9 is firmly attached to the side frame 2, the vehicle body rigidity is increased and the rigidity of the wheel suspension device is increased, so that the running stability can be improved and the share ratio of collision input by the sub-frame is improved. This reduces the cross-sectional area of the rear portion of the side frame and makes it possible to sufficiently increase the area of the opening surrounded by the side frame and the subframe for allowing the axle shaft to pass therethrough. Therefore, a great effect can be brought about in practical use.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a side view of FIG.
5 and FIG. 5 are BB cross-sectional views and CC cross-sectional views of FIG. 3, FIG. 6 (a) is a bottom view of the reinforcing plate, and FIG. 6 (b) is F of FIG. 6 (a). -F sectional view, FIGS. 7 (a) and 7 (b) are explanatory views showing the situation of deceleration of the vehicle body by the collision input of the structure of the present invention and the conventional structure, respectively. FIG. 8 is a side view of the conventional structure, and FIG. (A) and (b) are DD of FIG.
It is sectional drawing and EE sectional drawing. 1 ... Wheel apron, 2 ... Side frame, 2a ...
… Sloping surface, 2b …… Horizontal surface, 3 …… Side frame rear,
4 ... Radiator panel side, 5 ... Front cross member, 6 ... Linkage reinforcement, 7 ... Front linkment, 7a ... Vertical surface, 7b ... Horizontal surface, 7c ... Upper flange, 7d ... Lower flange, 8 …… rearward reinforcement, 8a …… vertical surface, 9 …… sub-frame, 10 …… reinforcing plate, 11 …… bumper, 12 …… opening.

Claims (1)

[Scope of utility model registration request] 1. An inclined surface which descends forward from the vicinity of the central portion in the front-rear direction of a vehicle body on the lower surface of a side frame having a substantially U-shaped cross section which is joined and fixed to a lower edge portion of an inner side surface of a wheel apron. And a lower surface of a front cross member joined and fixed to a front end portion of the wheel apron and a horizontal surface having substantially the same height, and a lower surface near a central portion of the side frame in the vehicle longitudinal direction. And the rear end of the side apron joined to and fixed to the rear end of the wheel apron, the front end of the subframe for supporting the wheel suspension device and the rear end of the horizontal surface of the lower surface of the side frame are substantially horizontal. A front structure of a vehicle body, characterized in that a reinforcing member connected to the vehicle body is provided.