JP7137905B2 - vehicle structure - Google Patents

Description

The present invention relates to vehicle structures such as automobiles.

As a specific example of a general vehicle structure, there is a structure described in Patent Document 1.
In the structure described in the document, a floor tunnel portion extending in the vehicle front-rear direction is formed at substantially the center portion in the vehicle width direction of the floor portion of the vehicle compartment. A pair of left and right floor cross portions extending in the vehicle width direction are provided on the floor portion on both sides of the floor tunnel portion in the vehicle width direction, with one ends joined to both side wall portions of the floor tunnel portion. .
According to such a configuration, it is possible to increase the rigidity of the vehicle body due to the presence of the floor cross portion.

However, the prior art still has room for improvement as described below.

That is, when a side collision of the vehicle occurs and a collision load is input to the vehicle body from the outer side in the vehicle width direction, the collision load may act on one of the pair of left and right floor cross portions. In this case, it is desired that the collision load is transmitted to the other floor cross portion via the floor tunnel portion and received appropriately. In order to deal with this, if the rigidity of the floor tunnel portion itself is increased or a large reinforcing member is added, the weight of the vehicle will increase and the manufacturing cost will increase.
In addition, the side wall of the conventional floor tunnel has a relatively small inclination angle with respect to the vertical direction. Therefore, when a vehicle side collision occurs and a collision load acts on the side wall portion in a substantially horizontal direction, the collision load acts on the side wall portion at an angle close to a right angle, and the side wall portion is relatively It is easily crushable. If an attempt is made to reinforce the floor tunnel portion in order to solve this problem, the weight of the vehicle will increase further, and the manufacturing cost of the vehicle will become more expensive.

As another example of conventional technology relating to the floor tunnel portion, Patent Document 2 describes means for providing a floor tunnel portion with a curved portion for suppressing so-called opening deformation of the floor tunnel portion. Patent Document 3 describes a means for curving the upper wall portion of the floor tunnel portion in the vertical direction. However, the means described in Patent Literatures 2 and 3 do not adequately solve the above problems.

JP 2011-194915 A JP-A-6-99857 JP 2011-173485 A

The present invention has been devised under the circumstances as described above, and it is possible to increase the strength of the vehicle against side collisions while suppressing increases in vehicle weight and manufacturing costs. The task is to provide a vehicle structure.

In order to solve the above problems, the present invention takes the following technical means.

A vehicle structure provided by the present invention includes a floor tunnel section positioned substantially in the center of a vehicle interior floor in the vehicle width direction and extending in the vehicle front-rear direction and having an upper wall section and left and right side wall sections; a pair of floor cross portions positioned on both sides of the floor tunnel portion in the vehicle width direction and extending in the vehicle width direction with one ends thereof joined to both side wall portions of the floor tunnel portion; A portion of the upper ridgeline serving as a boundary between the upper wall portion and the side wall portions in the vehicle front-rear direction is a curved ridgeline recessed toward the center of the floor tunnel portion in the vehicle width direction in a plan view. In the vehicle structure, each of the pair of floor cloth portions has a curved portion in which a portion of the both side wall portions in the vehicle front-rear direction is curved so that one end portion of each of the pair of floor cloth portions is the deepest recess of the curved portion. The floor tunnel portion includes a joint portion joined to the upper wall portion, and the area adjacent to the joint portion on the vehicle front side and the vehicle rear side of the floor tunnel portion is closer to the joint portion than the upper wall portion. The width and the width between the side wall portions are made small, and the lower ridge line as a boundary portion between the side wall portions of the floor tunnel portion and the general portion of the floor portion is the floor. The tunnel portion has a linear shape extending substantially over the entire length of the tunnel portion in the vehicle front-rear direction, or a curved shape having a radius of curvature larger than that of the upper ridge line, and the deepest portion of the recess of the curved portion of the both side wall portions, A wall portion on which the joint portion is provided is an inclined wall portion having a larger inclination angle with respect to the vertical direction than a portion where the curved portion is not formed .

According to such a configuration, the following effects are obtained.
First, when a side collision of the vehicle occurs and a collision load is input to the floor cross portion from the outer side in the vehicle width direction, this collision load acts on the deepest recess of the floor tunnel portion. On the other hand, the deepest recessed portion of the floor tunnel portion has the narrowest width (interval between both side wall portions) of the floor tunnel portion and has higher rigidity than the other portions. Therefore, it is possible to prevent the floor tunnel portion from being crushed by the collision load.
Second, a pair of floor cross sections can be brought closer together. Therefore, it is possible to improve the load transferability from one floor cross portion to the other floor cross portion and increase the strength of the vehicle body against a side collision of the vehicle.
Third, among the side walls of the floor tunnel portion, the side wall of the curved portion has a gentler inclination angle (larger inclination angle with respect to the vertical direction) than the side wall portions of the other portions. Therefore, when a side collision of the vehicle occurs and a load is input in a substantially horizontal direction from the floor cross portion to the side wall portion of the curved portion, the load should not be input at an angle close to a right angle to the side wall portion. It becomes possible to Therefore, the side wall portion of the floor tunnel portion is made more difficult to crush, and the load transferability from one floor cross portion to the other floor cross portion can be further improved.
Fourthly, as described above, the portion of the floor tunnel that receives the load from the floor cloth (the deepest recessed portion of the curved portion) has high rigidity and is resistant to crushing in the event of a vehicle side collision. It is possible to eliminate or reduce the need to increase the thickness of the tunnel portion or to reinforce the floor tunnel portion using a reinforcing member having a large size. Therefore, it is possible to reduce the weight of the vehicle and reduce the manufacturing cost.
Fifth, by providing the curved portion in the floor tunnel portion, it is possible to obtain the effect of suppressing the so-called opening deformation of the floor tunnel portion.

Other features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

1 is a schematic cross-sectional view of a main part showing an example of a vehicle structure according to the present invention; FIG. FIG. 2 is a schematic plan view of a main part of FIG. 1; FIG. 3 is a schematic perspective view of a main part of FIG. 2; FIG. 4 is a sectional view along IV-IV in FIG. 3;

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

A vehicle structure B shown in FIGS. 1 and 2 includes a floor portion 2 (front floor portion) of a passenger compartment 10 of a vehicle A, a floor tunnel portion 2A provided in the floor portion 2, a pair of left and right floor cross portions 3, and An additional floor cloth part 4 is provided.
A halftone dot pattern portion in FIG. 1 is a pair of left and right front side members 6 . The front side members 6 are spaced apart in the vehicle width direction and extend in the vehicle front-rear direction. there is
In FIG. 2, reference numeral 19 denotes a cowl provided on the upper part of the dash panel 29. As shown in FIG.

The floor portion 2 is configured by joining the front end portion of the floor panel 22 to the lower region of the dash panel 29 . The floor tunnel portion 2A is formed integrally with or separately from the floor portion 2, and has both side wall portions 20 and an upper wall portion 21 that are positioned substantially at the vehicle width direction central portion of the floor portion 2 and extend in the vehicle front-rear direction. is doing. An exhaust muffler (not shown) and the like are arranged inside the floor tunnel portion 2A.

The floor tunnel portion 2A has a pair of left and right upper ridgelines La as a boundary portion between the upper wall portion 21 and the side wall portions 20. A part of the ridgelines La is located on the floor tunnel portion 2A in plan view. A curved ridgeline La′ recessed with an appropriate radius of curvature is formed near the center in the width direction. This curved ridge line La' is formed by partially providing a curved portion 20a, which is formed by curving at least the upper region of both side wall portions 20 with an appropriate radius of curvature R, in a portion of the floor tunnel portion 2A in the longitudinal direction of the vehicle. formed by The width W of the upper wall portion 21 also changes correspondingly to the portion where the curved portion 20a is formed. Of the upper ridgeline La, portions other than the curved ridgeline La' are straight lines extending in the vehicle front-rear direction.

On the other hand, in the lower portion of the floor tunnel portion 2A, there is a lower ridgeline Lb as a boundary portion between the side wall portions 20 and the general portion of the floor portion 2 (non-floor tunnel portion). The lower ridgeline Lb extends linearly over substantially the entire length of the floor tunnel portion 2A in the longitudinal direction of the vehicle.
Therefore, in the side wall portion 20 of the floor tunnel portion 2A, the inclination angle (inclination angle with respect to the vertical direction) α1 at the portion where the curved portion 20a is provided is larger than the inclination angle α2 at the portion where the curved portion 20a is not provided. Large (see Figure 4).

The pair of floor cross portions 3 are arranged on the left and right sides of the floor tunnel portion 2A on the floor portion 2 and extend in the vehicle width direction to bridge the floor tunnel portion 2A and the rocker 18. As shown in FIG. One end 3a of the floor cloth portion 3 in the longitudinal direction is in contact with and joined to the deepest portion 20a' of the curved portion 20a of the floor tunnel portion 2A. As shown by the phantom lines in FIG. 4, as a means for reinforcing the floor tunnel portion 2A, a configuration in which a bridge-shaped reinforcing member 5 is provided in the floor tunnel portion 2A may be employed. As will be described later, the strength of the floor tunnel portion 2A is improved by the existence of the curved portion 20a, so that the reinforcing member 5 need not be thick and large in size.
The floor cross portion 3 is located between the A pillar 81 and the B pillar 82 of the vehicle A, as shown in FIG. The floor cloth portion 3 is constructed by using, for example, a hat-shaped cross-sectional member having a pair of flange portions 30 that are open downward, and the pair of flange portions 30 are welded to the floor panel 22 .

A pair of additional floor cross portions 4 have the same shape as the floor cross portion 3 and extend in the vehicle width direction. However, it is located on the rear side of the vehicle relative to the floor cross portion 3 and bridges and connects a portion of the floor tunnel portion 2A where the curved portion 20a is not provided and the rocker 18 .

Next, the operation of the vehicle structure B described above will be described.

First, the pair of floor cloth portions 3 are joined to the deepest recessed portion 20a' of the curved portion 20a of the floor tunnel portion 2A, and are indirectly connected via the deepest recessed portion 20a'. Here, the deepest recessed portion 20a' is the distance S between the side wall portions 20 in the floor tunnel portion 2A.
(see FIG. 4) is the narrowest portion and is the portion that is stiffer than the other portions. Therefore, when a side collision of the vehicle A occurs and the collision load F is input from the vehicle width direction outer side to the floor cross portion 3 and acts on the floor tunnel portion 2A, the floor tunnel portion 2A is prevented from being crushed. can be done. Further, since the pair of floor cross portions 3 are close to each other, the load transferability of the collision load F from one floor cross portion 3 to the other floor cross portion 3 can be improved. As a result, the strength of the vehicle body against a side collision of the vehicle A can be increased.

The side wall portion 20 of the curved portion 20a of the floor tunnel portion 2A has a gentler inclination angle than the side wall portions 20 of the portions other than the curved portion 20a. Therefore, when a side collision of the vehicle A occurs and the collision load F acts on the side wall portion 20 of the curved portion 20a through the floor cross portion 3, the collision load F is applied to the side wall portion 20 at an angle close to a right angle. becomes difficult to enter. Therefore, the side wall portion 20 is more resistant to crushing, and the load transferability from one floor cloth portion 3 to the other floor cloth portion 3 is further improved.

When a side collision of the vehicle A occurs, the position between the A pillar 81 and the B pillar 82 in the side part of the vehicle A is compared with the position where the A pillar 81 and the B pillar 82 are provided. easier to receive. On the other hand, since the floor cloth portion 3 is arranged in such a position, it is more preferable in terms of enhancing the load bearing performance and the impact absorption performance in the event of a side collision of the vehicle A.

On the other hand, unlike the upper ridgeline La, the lower ridgeline Lb of the floor tunnel portion 2A is a straight line extending in the vehicle front-rear direction over substantially the entire length of the floor tunnel portion 2A. Therefore, the portion where the lower ridge line Lb is formed has a high strength against the compressive force in the longitudinal direction of the vehicle. Therefore, when a frontal collision of the vehicle A occurs and a collision load Fa is input to the floor tunnel portion 2A from the front side of the vehicle as shown in FIG. It is possible to effectively transmit the collision load to the vehicle body member on the rear side of the floor tunnel portion 2A through the lower ridge line Lb while preventing deformation.

In addition, in the present embodiment, since the floor tunnel portion 2A is provided with the curved portion 20a, an effect of suppressing so-called opening deformation of the floor tunnel portion 2A is also obtained. Further, according to this embodiment, as a means for increasing the strength of the floor tunnel portion 2A in the vehicle width direction, a means for providing the curved portion 20a in the floor tunnel portion 2A is adopted, and the floor tunnel portion 2A is made thicker. Alternatively, it is possible to eliminate or reduce the need to use dedicated stiffening members which are large in size. Therefore, it is possible to promote reduction in vehicle weight and manufacturing cost.

The invention is not limited to the content of the embodiments described above. The specific configuration of each part of the vehicle structure according to the present invention can be modified in various ways within the intended scope of the present invention.

The specific radius of curvature and width of the curved portion 20a of the floor tunnel portion 2A and the curved ridgeline La' are not limited.
In the above-described embodiment, the lower ridgeline Lb is linear, but the present invention is not limited to this, and may be curved (curved with a larger radius of curvature than the curved ridgeline La'). good.
The upper wall portion 21 of the floor tunnel portion 2A may have a curved surface that is upwardly convex when viewed from the side of the vehicle, instead of having a planar upper surface, as described in Patent Document 3, for example. can. According to such a configuration, when a frontal collision of the vehicle A occurs, it is possible to obtain the effect of suppressing deformation of the vehicle front-rear direction intermediate portion of the upper wall portion 21 of the floor tunnel portion 2A so as to be depressed downward. .

B Vehicle structure La Upper ridgeline (ridgeline)
La' Curved ridge line 2 Floor portion 2A Floor tunnel portion 20 Side wall portion (of the floor tunnel portion)
20a Curved portion 20a' Deepest recessed portion 21 Upper wall portion (of the floor tunnel portion)
3 Floor cloth part 3a One end (of the floor cloth part)

Claims (1)

a floor tunnel portion positioned substantially in the vehicle width direction center portion of the floor portion of the vehicle compartment, extending in the vehicle front-rear direction, and having an upper wall portion and left and right side wall portions;
a pair of floor cross portions positioned on both sides in the vehicle width direction of the floor tunnel portion and extending in the vehicle width direction with one ends thereof joined to both side wall portions of the floor tunnel portion;
and
In the floor tunnel portion, an upper ridgeline serving as a boundary portion between the upper wall portion and the side wall portions has a curved shape recessed toward the center of the floor tunnel portion in the vehicle width direction in a plan view. The vehicle structure has a curved portion in which a part of the both side wall portions in the vehicle front-rear direction is curved so as to form a ridgeline of
One end of each of the pair of floor cloth portions further comprises a joint portion joined to the deepest recess of the curved portion,
Of the floor tunnel portion, in regions adjacent to the joint portion on the vehicle front side and the vehicle rear side, the width of the upper wall portion and the width between the side wall portions become smaller the closer the portion is to the joint portion. It is configured and
The lower ridgeline serving as a boundary between the side wall portions of the floor tunnel portion and the general portion of the floor portion is a straight line extending over substantially the entire length of the floor tunnel portion in the longitudinal direction of the vehicle, or the upper ridgeline. is curved with a radius of curvature greater than
Among the side wall portions, the wall portion, which is the deepest recessed portion of the curved portion and where the joint portion is provided, is an inclined wall having a larger angle of inclination with respect to the vertical direction than a portion where the curved portion is not formed. A vehicle structure, characterized in that it is a part .

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