JP7332260B2 - vehicle structure - Google Patents

Description

The present invention relates to vehicle structures such as automobiles.

As types of vehicles, there are cab-over vehicles and semi-cab-over vehicles (see Patent Documents 1 and 2, for example). Its structure is simplified and shown in FIG.
In the vehicle structure Ae shown in the figure, a power plant (not shown) such as an engine is mounted below the front floor portion 2, and an opening 20 (maintenance hole) for the power plant is provided in the area located above it. is provided. On the other hand, a pair of left and right front side members 4 are provided on the lower surface side of the front floor portion 2 so as to be spaced apart in the vehicle width direction and extend in the vehicle front-rear direction. The pair of front side members 4 are provided with inclined portions 42 that are inclined so that the distance between them in the vehicle width direction widens toward the rear of the vehicle with the vicinity of the front portion of the opening 20 as the inclination base point P.

However, in the above-described prior art, there is room for improvement as described below.

That is, as shown in FIG. 3(b), when an offset collision of the vehicle against the barrier B occurs as a frontal collision of the vehicle, the front side member 4 uses the inclination base point P as the bending deformation base point, As shown, there is a risk of bending deformation to the inner side in the vehicle width direction. As a result, excellent anti-collision load performance (impact resistance) cannot be obtained.
As a means for solving this problem, as shown in FIG. 4(a), it is conceivable to provide a cross member 49 that bridges and connects the pair of front side members 4 in the vicinity of the front side of the opening 20. FIG. However, according to such a configuration, when an offset collision occurs as shown in FIG. ) may occur. Therefore, it is not very effective in enhancing the collision load resistance performance at the time of a frontal collision of the vehicle.

JP 2006-88977 A JP 2015-116961 A

SUMMARY OF THE INVENTION The present invention has been conceived under the circumstances as described above, and is a vehicle structure capable of obtaining excellent collision load resistance performance at low cost and light weight when a frontal collision of the vehicle occurs. The challenge is to provide

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

The vehicle structure provided by the present invention is positioned at a distance in the vehicle width direction from an opening for a power plant provided in the front floor portion of the vehicle interior, and is located on the lower surface side of the front floor portion in the front and rear of the vehicle. and a pair of left and right front side members extending in the direction of the vehicle width, wherein the pair of front side members extend in the vehicle width direction toward the rear of the vehicle with the curved portion in the vicinity of the front portion of the opening in plan view as the base point of inclination. A floor cross which has an inclined portion which is inclined so as to widen the mutual interval, and which is located on the front side of the vehicle with respect to the opening portion and the inclination base point and bridges and connects the pair of front side members. member, the base point of inclination of each of the pair of front side members, and the midway point in the vehicle width direction of the floor cross member are bridged and connected, and the mutual interval in the vehicle width direction increases toward the rear of the vehicle. A pair of left and right inclined beam members are further provided, and each of the inclined beam members extends linearly in the longitudinal direction of the inclined beam member from the front end portion to the rear end portion thereof. Further, in a plan view, the rear end portion of each inclined beam member extends linearly in the longitudinal direction so as to overlap with the area extending from the front portion to the rear portion of the inclination base point. It is characterized by being insert welded to the front side member .

According to such a configuration, the following effects are obtained.
That is, when an offset collision occurs as a front collision of the vehicle, the front side member generates a force that tends to bend and deform greatly inward in the vehicle width direction with the tilt base point as the bending deformation base point. The slanted beam members effectively absorb such forces. Therefore, deformation of the front side member, and thus deformation of the area around the opening of the front floor portion, can be suppressed, and excellent collision load resistance performance can be obtained. It is possible to prevent deformation similar to matchbox deformation as shown in FIG. 4(b).
In addition, even when a full wrap collision occurs as a front collision of the vehicle, not only can the effect of suppressing the deformation of the front side member and the front floor portion as described above be obtained, but also the slanted beam member is projected from the front side of the vehicle. The received load is distributed to the pair of left and right front side members and transmitted to the inclined portions of the front side members in the longitudinal direction. Therefore, by improving the load transferability, it is possible to improve the impact absorption performance at the time of a frontal collision of the vehicle. In addition, a low-cost, lightweight structure can be achieved while improving offset and full-wrap crash performance.

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.

(a) is a schematic side view showing an example of a vehicle structure according to the present invention, and (b) is a schematic bottom view of a main part of (a). FIG. 3(a) is a schematic exploded perspective view of the essential parts of the vehicle structure shown in FIGS. 1 and 2, and FIG. (a) is a schematic bottom view of a main part showing an example of the prior art, and (b) is an explanatory diagram of action of (a). (a) is a schematic bottom view of a main part showing another example of the prior art, and (b) is an operation explanatory diagram of (a).

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.
In order to facilitate understanding, the same reference numerals are used for elements that are the same as or similar to those shown in FIGS.

A vehicle structure A shown in FIG. 1A is applied to a semi-cab-over type vehicle 1, and a power plant 8 located above a so-called underfloor-mounted power plant 8 is installed on a front floor portion 2 in a vehicle interior 10. The seat 3 is provided above the opening 20 with a seat riser 30 interposed therebetween. In the figure, reference numerals 9a and 9b indicate front wheels and rear wheels.

As shown in FIG. 1(b), this vehicle structure A includes a pair of left and right front side members 4 provided on the underside of the front floor portion 2, a floor cross member 5, and a pair of left and right inclined beams. A member 6 is provided.

The pair of front side members 4, which are one of the vehicle body frame members, are spaced apart in the vehicle width direction, and extend from the vicinity of the front end of the vehicle 1 toward the rear of the vehicle on the lower surface side of the front floor portion 2. It extends in the longitudinal direction of the vehicle. 2, each front side member 4 includes a main member 40 having a hat-shaped cross section with an upper opening, and joined to the upper surface of the main member 40 so as to close the upper opening of the main member 40. It is configured using a cover member 41 that is Note that the front side member 4 may be provided with a portion where the cover member 41 is not provided.
As shown in FIG. 1(b), the pair of front side members 4 are inclined so that the distance between them in the vehicle width direction widens toward the rear of the vehicle, with the vicinity of the front portion of the opening 20 as the inclination base point P. A slanted portion 42 that widens rearwardly is provided.

The floor cross member 5 is arranged on the lower surface side of the front floor portion 2 so as to be spaced from the opening portion 20 and the inclination base point P toward the front side of the vehicle, extends in the vehicle width direction, and is a pair of front side members. Both ends are welded to these front side members 4 so as to bridge the members 4 . As shown in FIG. 2(b), the front floor cross member 5 is composed of, for example, a main member 50 having a hat-shaped cross section with an upper opening, and an auxiliary member 51 joined to the upper surface. .

The pair of inclined beam members 6 are welded at both front and rear end portions thereof so as to bridge and connect the base points P of inclination of the pair of front side members 4 and the intermediate portions of the floor cross member 5 in the vehicle width direction. It is set in such a way that the distance between them in the vehicle width direction increases toward the rear of the vehicle. In a bottom view (plan view), the inclination angle α of the inclined beam member 6 can be substantially the same as the inclination angle β of the inclined portion 42 of the front side member 4, which is shown in FIG. 1(b). As such, they may be somewhat different.

As shown in FIG. 2, each inclined beam member 6 is configured using, for example, a member having a hat-shaped cross section. Also, as means for joining the inclined beam member 6 to the inclination base point P of the front side member 4, so-called insertion welding is employed. More specifically, in the vicinity of the inclination base point P of the front side member 4, a recessed portion 40a is formed by partially notching the upper edge portion of the main member 40. As shown in FIG. The rear end portion of the inclined beam member 6 is inserted inside the front side member 4 via the recessed portion 40a, and is welded while sandwiched between the main member 40 and the cover member 41. there is

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

When an offset collision occurs in the vehicle 1 and a large collision load Wa is input to the front portion of the vehicle 1 as shown in FIG. As such, bending deformation is likely to occur inward in the vehicle width direction, and in the vicinity of the tilt base point P, a bending force F in the vehicle width direction is generated. In contrast, in this embodiment, the inclined beam member 6 is connected to the inclination base point P, and the inclined beam member 6 effectively generates a tension force against the bending force F described above. Therefore, the front side member 4 is appropriately prevented from undergoing a large bending deformation at the position of the base point P of inclination. As a result, it is possible to improve the collision load resistance performance in the event of an offset collision, and to prevent the formation portion of the opening 20 of the front floor portion 2 from greatly deforming along with the front side member 4. be.

On the other hand, when a full wrap collision occurs as a frontal collision of the vehicle 1, the collision load at that time acts on the pair of front side members 4, and the floor cross member 5 also indirectly receives the load Wb. may work. In this case, the load Wb can be received by the pair of inclined beam members 6, and the distributed load Wb' of the load Wb is transmitted from the inclined beam members 6 to the inclined portions 42 of the front side members 4. be able to. Since the inclined beam member 6 and the inclined portion 42 are both widened rearward, the load can be easily transmitted from the pair of inclined beam members 6 to the inclined portion 42, and in addition to the collision load resistance performance of the vehicle 1, the impact absorption is improved. Better performance is also possible.

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 inclined beam member 6 and the inclined portion 42 of the front side member 4 may have a so-called rearwardly widening inclined shape, and as described above, the inclination angles α and β thereof may be the same or not. It doesn't matter if
Each of the front side member, the floor cross member, and the inclined beam member may be configured using a member different from the hat-shaped cross-sectional member as a main member.
Although the vehicle of the above-described embodiment is a semi-cab-over type vehicle, it goes without saying that the present invention can also be applied to a full-cab-over type vehicle.

A Vehicle structure P Inclination base point 2 Front floor portion 20 Power plant opening 4 Front side member 42 Inclined portion 5 Floor cross member 6 Inclined beam member

Claims (1)

An opening for the power plant provided on the front floor of the passenger compartment,
a pair of left and right front side members that are spaced apart in the vehicle width direction and extend in the vehicle front-rear direction on the lower surface side of the front floor portion;
and
The pair of front side members have inclined portions that are inclined so that the distance between them in the vehicle width direction widens toward the rear of the vehicle, with the curved portion in the vicinity of the front portion of the opening in plan view as the base point of inclination. a vehicle structure,
a floor cross member located on the front side of the vehicle relative to the opening and the base point of inclination and connecting the pair of front side members as a bridge;
A pair of right and left sides which bridge and connect the base points of inclination of the pair of front side members and an intermediate portion of the floor cross member in the vehicle width direction, and are set such that the distance between them in the vehicle width direction increases toward the rear of the vehicle. an inclined beam member;
is further equipped with
Each inclined beam member extends linearly in the longitudinal direction of the inclined beam member from its front end to its rear end, and in plan view, the rear of each inclined beam member. The ends are inserted and welded to the front side members so as to extend linearly in the longitudinal direction and overlap the region extending from the front to the rear of the base point of inclination. vehicle structure.

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