JPH0733985Y2 - Vehicle body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a body structure of a connecting portion between a floor panel and a dash panel.

(Prior Art) Generally, in this type of body structure, as schematically shown in FIG. 4, the front end portion of the floor panel (A) and the lower end portion of the dash panel (B) are connected to each other, and At the binding site of panels (A) and (B), both of these panels (A)
A cross member (C) having a U-shaped cross section which is connected to (B) and extends in the vehicle width direction is provided, and a space having a closed cross section between the both panels (A) and (B) and the cross member (C). (S) is formed, and the support bracket (D) is attached to the longitudinal middle portion of the cross member (C) to elastically support the engine on the support bracket (D).

By the way, in the vehicle having the above-mentioned body structure, as is apparent from FIG. 4, the support point (P) of the engine with respect to the support bracket (D) is located in front of the cross member (C) for reasons such as assemblability. It is generally offset in the left direction in FIG. 4, and therefore the support bracket (D) tries to shake its head in the direction of the arrow X in FIG. 4 due to the vibration when the engine is driven. The central portion in the vehicle width direction at the front end portions of the cross member (C) and the floor panel (A) forming the closed cross section space (S) is the rear end of the cross member (C) indicated by arrow X in FIG. There is a problem in that the floor panel (A) causes a waviness phenomenon due to the swing, and the muffled noise generated in the vehicle interior becomes loud.

The present invention was developed in view of the above circumstances, and its purpose is to ensure rigidity of the mounting portion of the engine support bracket by the extremely simple structure and to reliably generate the muffled sound in the vehicle interior. It is to provide a body structure that can be suppressed.

(Means for Solving the Problems) The present invention, however, connects the front end of the floor panel and the lower end of the dash panel, and the upper wall and the lower wall facing each other at the connecting portions of these panels. A cross member that extends in the vehicle width direction and includes a front wall that connects the front ends of the upper wall and the lower wall is assembled, and a space having a closed cross section is formed by the floor panel, the dash panel, and the cross member.
The middle portion of the cross member and the floor panel in the vehicle width direction is bent upward in a substantially U-shape, and is defined on the lower surface of the floor by the left and right inner side surfaces and the upper inner side surface connecting the upper ends of these inner side surfaces. In a vehicle in which an engine support bracket is bolted to the cross member while the formed front and rear extending floor tunnel is provided, in the floor tunnel, a portion where the cross member extends from the cross member to the floor panel. In the above, by arranging a reinforcement that overlaps from the upper inner surface to the left and right inner surfaces of the floor tunnel, and fixing the reinforcement to the cross member and the floor panel, a mounting bolt for the support bracket, Over the upper wall of the cross member, the lower wall of the cross member, and the reinforcement that overlaps with the lower wall Thereby passed by screw tightening of the nut to the bolt, it is characterized in that the support bracket is fixed to the floor tunnel forming part of the cross member.

(Operation) According to the present invention, in a highly rigid floor tunnel defined by the left and right inner side surfaces and the upper inner side surface connecting the upper ends of the both inner side surfaces, the cross member in the floor tunnel extends from the cross member to the floor panel. Since the reinforcement which is superposed from the upper inner surface to the left and right inner surfaces of the floor tunnel is fixed to the sharpened portion, the rigidity of the floor tunnel forming portion in the cross member to which the support bracket is assembled is fixed to the reinforcement. The mounting bolt of the support bracket overlaps with the upper wall of the cross member, the lower wall of the cross member, and the lower wall at the floor tunnel forming portion of the cross member that is further secured through the above-mentioned structure and has sufficient rigidity as described above. Since it is passed through the reinforcement and fixed by a nut, for example, Even if the engine support point on the support bracket is offset forward of the cross member, the cross member forming the closed cross-section space and the front end of the floor panel use the rear end of the cross member as a fulcrum. It is possible to reliably suppress the shaking.

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

The schematic sectional view of FIG. 1 shows a boundary portion between a vehicle compartment and an engine room in a sedan-type passenger car. In the figure, (1) is a dash panel that divides the vehicle room (R1) and the engine room (R2), ( Reference numeral 2) is a floor panel forming a floor of the passenger compartment (R1), the front end portion of the floor panel (2) is bent obliquely upward to provide an inclined wall portion (21), and the inclined wall portion is provided. The free end of the part (21) is fixed to the lower end of the dash panel (1) by welding.

Further, (3) is a cross member having a substantially U-shaped cross section that extends substantially the entire length in the vehicle width direction, and the cross member (3) and the floor panel (2) are arranged in the vehicle width direction as shown in FIG. The central portion is bent upward in a substantially U shape, and the left and right inner side surfaces (T1) (T2) and both inner side surfaces thereof are located below the central portion in the vehicle width direction of the cross member (3) and the floor panel (2). A floor tunnel (T) extending in the front-rear direction is defined by an upper inner surface (T3) connecting the upper ends of (T1) and (T2).

The hanging cross member (3) has the upper and lower walls (31) facing each other.
(32) and a front wall (33) that connects the front ends of the upper and lower walls (31) (32), and the rear end of the upper wall (31) is connected to the dash panel (1) and the floor panel (2). ) And the rear end of the lower wall (32) is connected to the front end of the floor panel (2) at the same time, and the cross member (3) and the floor panel (2) are inclined. The wall portion (21) forms a space (S) having a closed cross section that extends over substantially the entire length in the vehicle width direction.

Reference numeral (4) is a support bracket for elastically supporting an engine (not shown) on the vehicle body. The support bracket (4) is provided with a bolt (41) at the center of the cross member (3) in the vehicle width direction. ) And a nut (42).

The engine support point (P) of the support bracket (4) is located in front of the cross member (3) (first position).
Offset to the left in the figure).

In the embodiment shown in the figure, the second configuration
As shown in the figure, a steel sheet reinforcement is formed by bending both widthwise end portions into a curved shape so as to overlap from the upper inner side surface (T3) to the left and right inner side surfaces (T1) (T2) of the floor tunnel (T) ( 5) is separately formed, and the reinforcement (5) is groped from the cross member (3) to the floor panel (2) in the floor tunnel (5). The front end of (5) is located at the front end of the lower wall (32) of the cross member (3), and the rear end of the reinforcement (5) is behind the rear end of the lower wall (32) by a predetermined distance. The reinforcements (5) are arranged so as to be positioned, and the reinforcement (5) is formed on the lower surface of the cross member (3) and the floor panel (2). Spot melt to (T1) (T2) It is fixed by contact.

And a bolt (41) for mounting the support bracket (4)
As shown in FIG. 1, the reinforcement () for superposing on the upper wall (31) of the cross member (3), the lower wall (32) of the cross member (3) and the lower wall (32). 5) and the nut (42) is screwed to the bolt (41) so as to fix the support bracket (4) to the floor tunnel forming portion of the cross member (3).

In the above-mentioned body structure, the cross bracket (3) forming the support bracket (4) and the closed cross section space (S) and the inclined wall portion (21) of the floor panel (2) due to the vibration accompanying the driving of the engine. The central portion in the vehicle width direction is the second with the rear end of the cross member (C) as a fulcrum.
Although it tries to swing particularly greatly in the direction of the arrow X in the figure, the inner surface of the upper part of the floor tunnel (T) is located at the part where the cross member (3) in the floor tunnel (T) is crotch to the floor panel (2). (T3) to the left and right inner sides (T1) (T2)
Since the reinforcement (5) which is polymerized over the entire area is fixed, the rigidity of the floor tunnel forming portion of the cross member (3) is sufficiently secured through the reinforcement (5), and the rigidity is secured as described above. The mounting bolt (41) is superposed on the upper wall (31), the lower wall (31) and the lower wall (31) of the cross member (3) at the floor tunnel forming portion of the cross member (3). Since it is passed through the reinforcement (5) and fixed with a nut, the swing is reliably prevented,
Therefore, the waving phenomenon of the floor panel (2) is also suppressed,
The muffled sound in the passenger compartment is reduced accordingly.

FIG. 3 shows data obtained by measuring the muffled sound in the passenger compartment. In the figure, the alternate long and short dash line shows the case of the conventional body structure without the reinforcement (5), and the solid line (reinforcement (). 5 shows the case of the above embodiment including 5).

Thus, as is clear from FIG. 3, it can be seen that the muffled sound generated in the passenger compartment of the automobile having the structure of the embodiment is reduced.

(Effect of the Invention) As described above, according to the present invention, in a highly rigid floor tunnel defined by the left and right inner side surfaces and the upper inner side surface that connects the upper ends of these inner side surfaces, a cross is performed in the floor tunnel. From the member to the floor panel,
Since the reinforcement which is superposed from the upper inner surface to the right and left inner surfaces of the floor tunnel is fixed, the rigidity of the floor tunnel forming portion in the cross member to which the support bracket is assembled is further secured through the reinforcement, and As described above, at the floor tunnel forming portion of the cross member having sufficient rigidity, the mounting bolts of the support bracket are made to penetrate through the upper wall of the cross member, the lower wall of the cross member, and the reinforcement that overlaps with the lower wall. Since it is fixed by a nut, the cross member forming the closed cross-section space and the front end portion of the floor panel are the same even if the support point of the engine in the support bracket is offset forward of the cross member. Swing with the rear end of the cross member as the fulcrum The can reliably suppressed, thus ruffling of the floor panel be suppressed, the vehicle interior of booming noise is also be able to be correspondingly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a body structure according to the present invention, FIG. 2 is a schematic front view of a cross member, and FIG.
FIG. 4 is an explanatory view showing the measurement result of the muffled sound in the passenger compartment, and FIG. 4 is a schematic sectional view showing an example of a conventional body structure. (1) …… Dash panel (2) …… Floor panel (3) …… Cross member (4) …… Support bracket (5) …… Reinforcement

Claims (1)

[Scope of utility model registration request] 1. A front end portion of a floor panel and a lower end portion of a dash panel are connected to each other, and upper and lower walls facing each other and front ends of the upper wall and the lower wall are connected to connecting portions of these panels. A cross member having a front wall and extending in the vehicle width direction is assembled to form a space having a closed cross section with the floor panel, the dash panel, and the cross member, and the cross member and the floor panel have a vehicle width direction. By bending the middle portion upward in a substantially U shape, a floor tunnel is formed on the lower surface of the floor, which extends in the front-rear direction and is defined by the left and right inner side surfaces and the upper inner side surface connecting the upper ends of these inner side surfaces. On the other hand, in a vehicle in which an engine support bracket is bolted to the cross member, in a portion where the cross member extends from the cross member to the floor panel in the floor tunnel. Reinforcement that overlaps from the upper inner surface to the left and right inner surfaces of the floor tunnel is disposed, and the reinforcement is fixed to the cross member and the floor panel, while the mounting bracket mounting bolt is attached to the cross member. Through the upper wall of the member, the lower wall of the cross member, and the reinforcement that overlaps with the lower wall, the nut is screwed to the bolt, and the support bracket is fixed to the floor tunnel forming portion of the cross member. The body structure of the vehicle, which is fixed.