JPH11208520A - Floor cross member reinforcing structure on car body of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient rigidity on a car body against impact force at the time of side collision and to maintain a function of an opening to pass through an air conditioner duct, etc., favourable even in the case of forming the opening in a floor cross member passing through a middle part in the longitudinal direction of the air conditioner duct, etc. SOLUTION: A floor cross member 15 extending in the car width direction is fastened on an upper surface on a middle part in the longitudinal direction of a floor panel 11 of an automobile. Openings 21, 21 passing through in the longitudinal direction are formed on this floor cross member 15. Beads 22-25 extending in the car width direction are formed on the aforementioned floor panel 11 and/or the floor cross member 15 in the neighbourhood in the longitudinal direction of the aforementioned openings 21, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for a floor cross member when the vehicle body has a floor cross member fixed to the upper surface of a floor panel.

[0002]

2. Description of the Related Art A conventional structure for reinforcing a floor cross member in a vehicle body of an automobile is disclosed in Japanese Patent Application Laid-Open No. 9-24864. The floor cross member extending in the vehicle width direction is fixed to the upper surface of
The body is more reinforced.

In an automobile, an air-conditioning duct or a wire harness may be extended from the front to the rear of the vehicle body along the upper surface of the floor panel. At the intersection of the middle part in the longitudinal direction of the floor cross member and the middle part in the longitudinal direction of the floor cross member, the middle part protrudes upward and the vehicle compartment above the floor panel May be unnecessarily narrowed.

In view of the above, conventionally, there has been proposed a structure in which an opening penetrating in the front-rear direction is formed in the floor cross member so as to penetrate an intermediate portion of the air conditioning duct or the like so that the passenger compartment is not unnecessarily narrowed. Have been.

[0005]

By the way, when an opening is formed in a floor cross member as in the above-mentioned prior art, the strength of the portion of the floor cross member where the opening is formed tends to decrease.

For this reason, especially when another object such as another car collides with the side of the body of the car from outside (hereinafter, this is simply referred to as "side collision"), the above-mentioned floor cross member is used. And the floor cross member tends to bend in the vertical direction together with the floor panel around this portion, that is, there is a possibility that sufficient rigidity is not secured in the vehicle body.

[0007] Therefore, it is conceivable to provide a reinforcing material for reinforcing the portion of the floor cross member in which the opening is formed. However, if such a reinforcing material is simply provided, the area of the opening is reduced by the reinforcing material. May be
For this reason, there arises a problem that the function of the opening for penetrating an air conditioning duct or the like is impaired.

[0008] The present invention has been made in view of the above circumstances, and even if an opening is formed in the floor cross member through an intermediate portion in the longitudinal direction of an air-conditioning duct or the like,
It is an object to ensure that the vehicle body has sufficient rigidity against the impact force at the time of “side collision”.

It is another object of the present invention to solve the above-mentioned problem by maintaining the function of the above-mentioned opening for allowing an air-conditioning duct or the like to pass therethrough.

[0010]

A floor cross member reinforcing structure for a vehicle body of an automobile according to the present invention for solving the above-mentioned problems is provided on an upper surface of a floor panel 11 of the automobile 1 at an intermediate portion in a front-rear direction, in a vehicle width direction. In a vehicle body of an automobile having an extended floor cross member 15 fixed thereto and openings 21 and 21 penetrating the floor cross member 15 in the front-rear direction,

The floor panel 11 and / or the floor cross member 15 near the openings 21 and 21 in the front-rear direction are provided with beads 22 to 25 extending in the vehicle width direction.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes an automobile, and an arrow Fr
Indicates the front, and the left and right described below refer to the vehicle width direction toward the front.

The vehicle body 2 of the automobile 1 has a vehicle body frame 3 and a vehicle body 4 located above the vehicle body frame 3 and supported by the vehicle body frame 3. Left and right front wheels 5 and 5 suspended from the vehicle body frame 3 and left and right rear wheels 6 and 6 suspended
Thus, the vehicle body 2 is supported on the running surface 7. The vehicle body 2 is substantially symmetrical with respect to a vehicle body center line 8 passing through the center in the vehicle width direction.

The vehicle body 4 has a floor panel 11 at a lower end thereof. The floor panel 11 is joined to an upper surface of the vehicle body frame 3 by spot welding S, and the vehicle body 4 above the floor panel 11 is provided. The interior of 4 is a vehicle compartment 12. The floor panel 11 is a tunnel 1 formed near the vehicle body center line 8.
The tunnel 13 has a substantially inverted U-shaped cross section when viewed from the front and extends in the front-rear direction.

A pair of left and right floor cross members 15, 15 extending in the vehicle width direction are arranged in a row on the upper side surface of the floor panel 11 in the middle part in the front-rear direction with the tunnel 13 interposed therebetween. Is fixed to the upper surface of the side part. Each of these floor cross members 15
Is formed by pressing a single long sheet metal material, and a ceiling plate 16 extending in the vehicle width direction;
A pair of front and rear side plates 17 extending integrally downward from respective front and rear edges of the ceiling plate 16;
7 has outward flanges 18 extending integrally from the lower end edge toward the front or the rear, and each of the cross sections of the floor cross member 15 in the longitudinal direction (vehicle width direction) is substantially an inverted U-shape. It has a shape.

The end of each of the floor cross members 15 on the vehicle body center line 8 side is connected to the tunnel 13 by spot welding S.
In the middle part in the longitudinal direction, the outward flanges 18 are joined to the floor panel 11 by spot welding S, whereby the floor cross members 15 are fixed to the floor panel 11 as described above. I have. On each side of the floor panel 11, another floor cross member 15 'is provided behind each floor cross member 15, and a seat 19 is supported so as to straddle these floor cross members 15, 15'.

In the above case, the floor cross member 15 has a box-shaped cross section in a side view in cooperation with the middle part of the floor panel 11 in the front-rear direction, and has the same high strength and rigidity as the tunnel 13. Thereby, the strength and rigidity of the vehicle body 2 are increased as a whole.

The front and rear side plates 17, 17 at the end of the floor cross member 15 on the vehicle body center line 8 side have:
Openings 21 and 21 penetrating in the front-rear direction are formed, and these openings 21 and 21 penetrate an intermediate part in the longitudinal direction when an air conditioning duct or the like is provided.

A plurality of first to fourth beads 22 to 25 projecting upward and extending in the vehicle width direction are provided on the floor panel 11 in the vicinity of the openings 21 and 21 in the front-rear direction.
Are formed, and among these, the first and second beads 22 and 23 are formed.
Are formed on each part of the floor panel 11 near the front and rear of each of the floor cross members 15. Also,
First and second extension beads 26 and 27 are formed on the side plate of the tunnel 13 so as to be continuous with the respective ends of the first and second beads 22 and 23 on the vehicle body center line 8 side. In addition, the third bead 24 is connected to the floor cross member 1.
5, a portion of the floor panel 11 between the front and rear side plates 17 and 17 and between the front and rear openings 21 and 21.

The fourth bead 25 is formed on the ceiling plate 16 of the floor cross member 15 so as to extend in the vehicle width direction.
5 is provided over almost the entire length.

According to the above configuration, the strength of the floor cross member 15 where the openings 21 and 21 are formed tends to decrease. However, the floor cross member 15 has the first to fourth beads 22 to 25. And the above-mentioned reduction in strength is prevented.

Furthermore, since the first to fourth beads 22 to 25 extend in the vehicle width direction, when the vehicle body 2 receives a large impact force from the outside thereof, such as when the vehicle 1 is in a "side collision", Since each of the beads 22 to 25 strongly supports the impact force in the longitudinal direction thereof,
The floor cross member 15 is attached to the floor panel 11
In addition, bending in the vertical direction is more reliably prevented.

Therefore, the opening 2 is formed in the floor cross member 15.
Even in the case of forming 1, 21, sufficient rigidity of the vehicle body 2 is secured against the impact force at the time of “side collision”.

In particular, the third and fourth beads 24, 25
In the front-rear direction, between the two openings 21 and 21 (almost at the center)
The front and rear side plates 17 having the openings 21 formed therein are reinforced without bias to each other, and the floor panel 11
The third and fourth beads 24 and 25 are used to directly reinforce the box-shaped cross section formed by the
Prevents the floor cross member 15 from bending as described above.

Further, the reinforcement of the portion of the floor cross member 15 in which the openings 21 and 21 are formed as described above is performed by a bead 22 formed to extend in the vehicle width direction near the front and rear direction of the openings 21 and 21. Since these beads have a small projecting dimension, it is possible to prevent the beads 22 to 25 from reducing the area of the openings 21 and 21.

Thus, as described above, the function of the openings 21 and 21 for allowing the air-conditioning duct and the like to penetrate is maintained in a good condition, while ensuring the vehicle body 2 to have sufficient rigidity.

Further, according to the floor cross member 15 reinforced as described above, there is an advantage that the torsional rigidity of the vehicle body 2 is improved.

Further, in the above configuration, the floor panel 1
Inside the closed cross section surrounded by the floor cross member 15 and the floor cross member 15, a plurality (a pair of right and left) of reinforcing plates 30 as bulk heads are provided at a middle portion of the floor cross member 15 in the longitudinal direction. The board 30 is the floor panel 11
And the ceiling plate 16 and each side plate 17 of the floor cross member 15 are connected by spot welding S. For this reason, the reinforcing plate 30 improves the strength and rigidity of the floor cross member 15, and keeps the floor cross member 15 in the cross-sectional shape against various external forces.

The tunnel 13 is reinforced by the extension beads 26 and 27 and has a greater strength and the like.
And the reinforcing plate 30 are disposed near the openings 21 and 21 in the vehicle width direction so as to sandwich the openings 21 and 21 from the left and right.
In addition to the elements 25 to 25, the portion of the floor cross member 15 having the openings 21 and 21 is further reinforced by the tunnel 13 and the reinforcing plate 30.

Therefore, the bending of the floor cross member 15 around the above-mentioned portion at the time of the "side collision" is more reliably prevented.

In the above case, the first to third beads 22 to 22
24 is formed only in a part of the floor panel 11 near the openings 21 and 21 in the vehicle width direction, and is formed in the vehicle width direction with the tunnel 13 based on the first to third beads 22 to 24. Is a plurality of other beads 3 extending in the front-rear direction on the other side of the floor panel 11 on the opposite side in the vehicle width direction.
1 is formed.

The other bead 31 strongly supports, in the longitudinal direction, an external force directed to the vehicle body 2 in the front-rear direction, so that the vehicle 1 collides (frontal collision) with an object in front of it. Of the tunnel 13
At the same time, the other bead 31 firmly supports the vehicle body 2, thereby preventing the vehicle body 2 from bending up and down around a part in the front-rear direction. In this regard, the vehicle body 2 also has sufficient rigidity. .

Although the above description is based on the illustrated example, the first to fourth
Of the beads 22 to 25, only a part of the beads may be provided. In addition, the fourth bead 25 includes the first to third beads 22 to
Together with 24, it may be formed only in the vicinity of the openings 21 and 21 in the vehicle width direction, or may protrude downward from the ceiling plate 16.

[0035]

According to the present invention, there is provided an automobile in which a floor cross member extending in the vehicle width direction is fixed to an upper surface of a floor panel of an automobile at a middle part in the front and rear direction, and an opening penetrating in the front and rear direction is formed in the floor cross member. In the body of

A bead extending in the vehicle width direction is formed on the floor panel and / or floor cross member in the vicinity of the opening in the front-rear direction.

For this reason, although the strength of the portion of the floor cross member where the opening is formed tends to decrease, the portion of the floor cross member is reinforced by the beads,
The above-mentioned decrease in strength is prevented.

Further, since the bead extends in the vehicle width direction, when the vehicle body receives a large impact force from the outside thereof, such as when the vehicle is in a "side collision", the bead reduces the impact force. Since the floor cross member is firmly supported in the longitudinal direction, the floor cross member is more reliably prevented from bending in the vertical direction together with the floor panel around the portion of the floor cross member where the opening is formed.

Therefore, even when the opening is formed in the floor cross member, sufficient rigidity is secured in the vehicle body against the impact force at the time of "side collision", and the deformation is prevented.

Further, what reinforces the portion of the floor cross member having the opening formed as described above is a bead formed so as to extend in the vehicle width direction in the vicinity of the opening in the front-rear direction. Since the size of the protrusion is small, it is avoided that this bead reduces the area of the opening.

Therefore, as described above, the function of the opening for penetrating an air-conditioning duct or the like is maintained in good condition, while ensuring sufficient rigidity in the vehicle body.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of FIG.

FIG. 2 is an overall side view simplified view of an automobile.

FIG. 3 is a partial perspective view of a vehicle body floor.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

5 is a sectional view taken along line 5-5 in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile 2 Body 11 Floor panel 12 Cabin 13 Tunnel 15 Floor cross member 21 Opening 22-25 Bead 30 Reinforcement plate

Claims (1)

[Claims] 1. A vehicle body in which a floor cross member extending in a vehicle width direction is fixed to an upper surface of a floor panel of a vehicle at a middle part in a front-rear direction, and an opening penetrating in the front-rear direction is formed in the floor cross member. A floor cross member reinforcing structure in a vehicle body of a vehicle, wherein a bead extending in a vehicle width direction is formed in the floor panel and / or the floor cross member in the vicinity of the opening in the front-rear direction.