JPH01309880A - Structure of front body of vehicle - Google Patents

Abstract

PURPOSE:To prevent a front side frame from being folded in a head-on collision to heighten buffer effect by connecting a reinforcement coupled to a suspension tower to a neighborhood of the connecting part between font side frame and a reinforcing member. CONSTITUTION:A closed cross section shape front side frame 4 stretched in both front and rear directions of a body is connected to the inner side surface of a wheel apron 2 forming the sidewall of an engine room S. In the wheel apron 2, a wheel house 2A is formed and a suspension tower 3 is connected to its upper part. The suspension tower 3 is connected to the front side frame 4 through a pair of front and rear reinforcements 5A, 5B to be prevented from falling inward. The back end of the front side frame 4 is connected to a dash lower panel which divides the engine room S from a cabin through a gusset 13B as a reinforcing member.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a front body structure of a vehicle such as an automobile.

(Prior art) Conventionally, as a front body structure of an automobile, for example,
As described in Publication No. 28669, front side frames extending in the longitudinal direction of the vehicle body are provided on both sides of the engine room, and the front side frames are connected to a darts lower panel that partitions the engine room and the passenger compartment. On the other hand, it is known that a suspension tower section for housing a front suspension member is formed on both side walls of the engine room, and the suspension tower section is connected to the front side frame.

(Problem to be solved by the invention) However, in such a structure, the highly rigid suspension tower part and the similarly rigid front side frame are connected, and as a result, the rigidity of the connected part is lower than that of other parts. Therefore, in the event of a frontal collision (hereinafter simply referred to as a frontal collision), the extremely low rigidity of the suspension tower will cause the suspension tower to fall backwards, causing the front part of the front side frame to collapse against the front side. Since the front side frame is bent upward relative to the rear part of the frame, the front side frame cannot receive the impact load in the axial direction, and the impact absorption due to the bellows deformation of the front side frame cannot be efficiently performed.

The present invention has been made in view of the above, and an object of the present invention is to provide a front body structure for a vehicle that prevents bending and deformation of the front side frame in the event of a collision and efficiently absorbs shock in the event of a collision. shall be.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a front side frame extending in the longitudinal direction of the vehicle body on both sides in the engine room, and the front side frame is connected to a reinforcing member. It is connected to the darts lower panel that partitions the engine room and the passenger compartment, while a suspension tower section that houses the front suspension members is formed on both side walls of the engine room, and the rear part of the suspension tower section is connected to the darts lower panel that partitions the engine room and the passenger compartment. A reinforcing reinforcement for preventing this is joined, and the reinforcing reinforcement is connected near the connecting portion between the front side frame and the reinforcing member.

That is, in the present invention, the suspension tower section is supported by the dash panel through the reinforcing reinforcement and the reinforcing member, thereby preventing the suspension tower section from falling backward in the event of a collision.

(Function) The reinforcing reinforcement that prevents the suspension tower from falling inward is connected near the connection between the front side frame and the reinforcing member, so in the event of a collision, the front of the vehicle receives an impact load. Also, the suspension tower section is supported by the highly rigid dash panel via the reinforcing reinforcement and the reinforcing member, and the suspension tower section is prevented from falling backwards. The bending deformation of the front side frame is suppressed.

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

In the front body structure of the automobile 1 shown in FIG. 1, as shown in FIG. 2, the side wall portion of the engine room S is constituted by a wheel apron 2, and the inner surface of the wheel apron 2 is located on the vehicle width center side. A front side frame 4 having a closed cross section and extending in the longitudinal direction of the vehicle body is joined to the front side frame 4.

A wheel house part 2A is formed in the wheel apron 2, and the upper part of the shock absorber 11 (see FIGS. 1 and 5) of the front wheel suspension device is accommodated in the approximate center of the wheel house part 2A. A suspension tower 3 having extremely high rigidity is joined to the wheel house portion 2A in order to fix the wheel.

The suspension tower 3 includes a tower upper 3A that forms the upper part and has a mounting hole for partially inserting and supporting and fixing the upper end of the shock absorber 11, and a tower upper 3A that is joined to the lower peripheral wall of the tower upper 3A. forming the lower part of the shock absorber 1
1, and a tower lower 3B that accommodates a part of the tower. Here, tower upper 3 of suspension tower 3
A is slightly inclined at a predetermined inclination angle toward the inside of the engine room, and is provided so as to protrude upward by a predetermined height from the upper end of the wheel house portion 2A.

A flat vertical wall portion 3b that is parallel to the outer vertical wall portion 4a of the front side frame 4 is formed on the inner side of the tower lower 3B of the suspension tower 3.
b is joined to the outer vertical wall portion 4a of the front side frame 4. Further, auxiliary members 10A and IOB are attached to the front and rear surfaces of the tower lower 3B with bolts 9, 9.

The front side frame 4 has a closed section shape with a frame lower 4A and a frame upper 4B, and a flange portion 4b is provided at the upper end of the inner vertical wall portion 4C of the frame lower 4A having a U-shaped cross section. It is formed as a result.

Except for the portion of the front side frame 4 located inside the suspension tower 3, a flange portion 4d is formed outward at the upper end portion of the outer vertical wall portion 4a of the front side frame 4, and a flange portion 4d is formed facing outward. The upper end is joined to the inner edge and flange portion 4b of the frame upper 4B that closes the upper end, and to the outer edge and flange portion 4d of the frame upper 4B, and the frame lower 4A and the frame upper 4B form a closed cross-sectional shape. has been done. The portions of the wheel apron 2 before and after the wheel house portion 2A extend substantially horizontally at the same height as the upper end of the front side frame 4, and their inner edges are joined to the upper surface of the frame upper 4B.

Here, in order to strengthen the connection structure between the suspension tower 3 and the front side frame 4 and prevent the suspension tower 3 from falling inwards, a pair of reinforcing rains are installed in the front and rear across the suspension tower 3 and the front side frame 4. Forcements 5A and 5B are provided.

That is, the front and rear sides of the suspension tower 3 are each formed into a substantially vertical and flat vertical wall shape, and reinforcing reinforcements 5A and 5B are respectively joined along the vertical wall-shaped portions at both the front and rear sides.

A flange portion 5a is formed on the lower edge side of the upper part of the front reinforcing reinforcement 5A, and the flange portion 5a is
At the front joint between the tower upper 3A and the tower lower 3B, a pair of bolts 8, 8 are attached to the wheel house 12A, the lower flange 3c of the tower upper 3A, and the flange 10a of the auxiliary member 10A on the front of the tower lower 3B.
connected by. On the other hand, the lower part of the reinforcing reinforcement 5A extends to the inside of the front side frame 4 and is arranged in the shape of a transverse partition wall that partitions the inside of the front side frame 4, and each flange formed at the lower part of the reinforcing reinforcement 5A The portions 5b, 5c, and 5d are joined to the inner wall surface of the frame lower 4A to form a joint inside the front side frame 4. The connection structure of the rear reinforcing reinforcement 5B to the joint between the tower upper 3A and the tower lower 3B is the same as that of the front part.

In this way, since the suspension tower 3 is connected to the front side frame 4 via the front and rear pair of reinforcing reinforcements 5A and 5B, when driving, the suspension tower 3 is connected to the suspension tower 3 toward the inside of the engine room. When an external force in the lateral direction is applied, the load from the suspension tower 3 is reliably supported by the entire front side frame 4 via the pair of front and rear reinforcing reinforcements 5A and 5B. Falling down can be prevented.

Since the reinforcing reinforcements 5A and 5B form joints inside the front side frame 4, the joint strength between the suspension tower 3 and the front side frame 4 is significantly strengthened, and the rigidity of the front side frame 4 is increased. is also enhanced at the same time.

Furthermore, the above-mentioned pair of front and rear reinforcing reinforcements 5
Inside the front side frame 4 divided by A and 5B, a bracket 6 is provided for attaching a subframe in the vehicle width direction for mounting a lower arm of a suspension device and an engine.

The frame upper 4B is divided at the position of the reinforcing reinforcements 5A and 5B, and the upper end of the frame lower 4A is closed between the reinforcing reinforcements 5A and 5B with a lid member 7. 7 and frame lower 4A
An insertion hole is formed in which a cross member 16, which will be described later, is attached with a pair of bolts. The inner end portion of the lid member 7 is joined to the flange portion 4b of the frame lower 4A,
A vertical flange portion 7a provided at the outer end of the lid member 7
is joined to the vertical flange portion 4e at the upper end of the outer vertical wall portion 4a of the frame lower 4A, and the flange portions 7b at both front and rear ends of the lid member 7 are connected to the reinforcing reinforcement 5A,
5B, and the lid member 7 and the frame lower 4
A and A form a closed cross section.

Note that a flange portion 5b for increasing rigidity is extended and provided at the upper edge portion of the upper portion of the reinforcing reinforcements 5A and 5B that are joined to the suspension tower 3.

Further, the rear end portion of the frame lower 4A of the front side frame 4 extends to the vicinity of the darts lower panel 12 that partitions the engine room and the passenger compartment, and is connected to the darts lower panel 12 through gussets 13A and 13B as reinforcing members. It is connected to the.

The lower part of the rear reinforcing reinforcement 5B is connected to the vicinity of the connection between the front ends of the gussets 13A and 13B and the frame lower 4A.

The lid member 18 joined to the upper side of the gussets 13A and 13B has a vertical flange part 18a on the outer edge and a horizontal flange part 18b on the inner edge at the same height position as the frame upper 4B. flange portion 18a of
is joined to the vertical flange portion 13a of the gusset 13A, while the inner flange portion 13b is joined to the horizontal flange portion 18b of the gusset 13B. At the same time, the lid member 18 has a vertical wall portion 18c on the rear edge, the vertical wall portion 18c is joined to the dash lower panel 12, and a reinforcing portion protrudes upward near the joint with the dash lower panel 12. A convex portion 18d is formed.

Furthermore, reinforcing members 14 and 15 are provided at the connection portions between the tower lower 3B of the suspension tower 3 and the frame lower 4A of the front side frame 4, respectively. That is, the front reinforcing member 14 has a substantially U-shaped cross section with tall vertical walls 14b and 14c extending upward from both side edges of the base plate 14a, and the front side is divided by the reinforcing reinforcement 5A. It is provided across the frame lower 4A of the frame 4, and is connected to a cross member 16 having a hat-shaped cross section that extends in the left-right direction of the vehicle body and supports an engine (not shown). Further, the outer vertical wall portion 14c is connected to the lower portions of the frame lower 4A and the tower lower 3B of the front side frame 4 via bolts 19 and 19.

On the other hand, the rear reinforcing member 15 has vertical wall parts 15b and 15c of low height on both side edges of the base plate part 15a, and similarly, the frame of the front side frame 4 is divided by the reinforcing reinforcement 5B. It is provided across the lower 4A. That is, the front side frame 4 and the reinforcement member 1
A reinforcing reinforcement 5B on the rear side is connected near the connection part with 5 to reinforce the connection part. Further, the outer vertical wall portion 15c is connected to the frame lower 4A and the tower lower 3B of the front side frame 4 by bolts 20, and the rear end portion is also connected to the floor panel 17.

The front body structure on the right side of the automobile has been described above, but the front body structure on the left side is also symmetrical and has a similar structure.

With the above configuration, the reinforcing reinforcements 5A and 5B are connected to the vicinity of the connecting portion between the front side frame 4 and the gussets 13A and 13B, and the connecting portion is reinforced and As a result, the suspension tower 3 is tension-supported by the darts lower panel 12, and even if the suspension tower 3 tries to fall backward due to the impact during a frontal collision, the tension support prevents the suspension tower 3 from falling backward. As a result, the connecting portion does not become a trigger for bending deformation, and bending deformation is suppressed.
The front side frame 4 is deformed into a bellows shape, and the impact force is absorbed by the bellows deformation.

In addition, since the above-mentioned connecting portion is reinforced and bent and deformed, the gusset (13A, 1) that widens toward the rear.
3B, and the load is effectively distributed to the darts lower panel 12.

In the above embodiment, the reinforcing reinforcement 5B joined to the suspension tower 3 is connected to the front side frame 4 and the gusset 13A.

Although it is connected to the front side frame 4 near the connection part with 13B (reinforcing member), the gussets 13A and 13 are connected to the front side frame 4 without being connected to the front side frame 4.
It may be possible to connect only to B.

(Effects of the Invention) As described above, the present invention includes a reinforcing reinforcement that is joined to a suspension tower portion that accommodates a front suspension member, and a reinforcing reinforcement that is connected to a connecting portion between the front side frame and the reinforcing member. Since they are connected nearby, the front side frame is prevented from bending and deforming in the event of a head-on collision, thereby allowing the front side frame to efficiently absorb impact.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a perspective view of an automobile, FIG. 2 is a perspective view of a main part of the front body structure of the automobile, and FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2. , FIG. 4 is a side view of the main part of the front body structure of an automobile, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, and FIG. FIG. 7 is a perspective view showing the relationship among the front side frame, gusset, and floor panel. 1...Car, 2...Wheel apron, 3...
Suspension tower, 4... Front side frame, 5A, 5B... Reinforcement, 1
1...Shock absorber, 12...Dass lower panel, 13A, 13B...Gusset

Claims (1)

[Claims] (1) Front side frames extending in the longitudinal direction of the vehicle body are disposed on both sides of the engine room, and the front side frames are connected to a reinforcing member and connected to a dash lower panel that partitions the engine room and the passenger compartment. Suspension tower sections for storing front suspension members are formed on both side walls of the room, and a reinforcing reinforcement is joined to the rear of the suspension tower section to prevent the suspension tower section from falling inward. A front body structure for a vehicle, characterized in that the front side frame and the reinforcing member are connected to each other near a joint between the front side frame and the reinforcing member.