JP6964939B2 - Vehicle substructure - Google Patents

Description

The present invention relates to a substructure of a vehicle such as an automobile.

As an example of the lower structure of the vehicle, there is the structure described in Patent Document 1.
The structure described in the same document consists of a pair of left and right side members that are located on both left and right sides of the lower part of the vehicle and extend in the front-rear direction of the vehicle, and are connected to these pair of side members in a bridging manner so as to be spaced apart in the front-rear direction of the vehicle. It is provided with a plurality of cross members located at the same time and vertical members connected to the plurality of cross members in a bridging manner.

However, in the above-mentioned vehicle substructure, there is room for improvement as described below.

That is, although the vertical members are connected to a plurality of cross members in a bridging manner, they are set so as to extend straight in the front-rear direction of the vehicle. Therefore, the vertical member, the plurality of cross members, and the pair of side members are merely connected in a grid shape orthogonal to each other in a plan view. Therefore, when a large load in the horizontal direction is applied to the lower part of the vehicle, for example, the above-mentioned square-shaped portion is likely to be deformed into a parallelogram (hereinafter referred to as "matchbox deformation"), and the vehicle is likely to be deformed. It is difficult to make the body rigidity of the lower part of the body sufficiently high.
As a means for solving such a problem, it is conceivable to increase the number of vertical members and cross members, but even if such a means is adopted, it is difficult to effectively prevent the matchbox deformation. In addition, it causes new defects such as an increase in weight, a deterioration in productivity, and an increase in manufacturing cost.

Japanese Unexamined Patent Publication No. 2007-38717

The present invention has been conceived under the above-mentioned circumstances, and it is possible to prevent the matchbox deformation of a predetermined member while appropriately suppressing an increase in weight and an increase in manufacturing cost, and to prevent a vehicle from being deformed. The challenge is to provide the lower structure of the vehicle that can effectively increase the rigidity of the lower body.

In order to solve the above problems, the following technical measures are taken in the present invention.

The vehicle lower structure provided by the present invention is formed as a bridge between a pair of left and right side members located on both left and right sides of the lower portion of the vehicle and extending in the vehicle front-rear direction and the pair of side members extending in the vehicle width direction. A plurality of cross members that are connected to each other and are spaced apart from each other in the front-rear direction of the vehicle, and a plurality of cross members that are located closer to the center in the vehicle width direction than the pair of side members and are connected to the plurality of cross members in a bridging manner. It is a lower structure of a vehicle and includes a vertical member having at least one side wall portion in a vertical height direction or a vertical diagonal direction, and the vertical member has a plan view table shape. The plate-shaped member is provided, and the side wall portion is provided with a pair of side wall portions that are bent-likely connected to both side edges of the plate-shaped member in the vehicle width direction and are spaced apart in the vehicle width direction. , These pair of side wall portions extend linearly at an angle inclined obliquely with respect to the vehicle front-rear direction over the entire length range from one cross member to the other cross member among the plurality of cross members. It is characterized by being symmetrical in a plan view centered on a straight line extending in the front-rear direction of the vehicle.

According to such a configuration, the following effects can be obtained.
First, since the side wall portion of the vertical member extends in a direction inclined diagonally with respect to the front-rear direction of the vehicle, deformation of the connecting structure between the cross member and the vertical member is suppressed as in the case of the diagonal member in the truss structure. It exerts the action of Therefore, it is possible to make the matchbox deformation less likely to occur when a horizontal load is applied to the lower part of the vehicle, as compared with the conventional technology in which the cross member and the vertical member are simply connected in a square shape. , It is possible to effectively increase the body rigidity of the lower part of the vehicle.
Secondly, according to the present invention, as a means for increasing the body rigidity of the vehicle, a means for tilting the side wall portion of the vertical member diagonally with respect to the front-rear direction of the vehicle is adopted, but a reinforcing member is separately used. There is no particular need to make each part thicker than before. Therefore, it is possible to reduce the weight and improve the productivity, and it is also possible to appropriately reduce the manufacturing cost of the vehicle.

In the present invention, preferably, one of the plurality of cross members is a lower back located near the rear end of the vehicle, and the vertical member is provided with a spare tire carrier capable of holding a spare tire. The vertical member has a pair of left and right side wall portions located on both sides of the vertical member in the vehicle width direction as the side wall portions, and these pair of side wall portions are in the vehicle width direction toward the front side of the vehicle. Both extend in a direction obliquely inclined with respect to the front-rear direction of the vehicle so that the mutual distance between the two side walls is narrowed, and the region between the pair of side wall portions provides a tool for operating the spare tire carrier. It is a passage for advancing from the rear side toward the spare tire carrier.

According to such a configuration, the following effects can be obtained.
First, since both of the pair of side wall portions located on both sides of the vertical member in the vehicle width direction are inclined diagonally with respect to the vehicle front-rear direction, a matchbox having a connection structure of the vertical member, the cross member, and the side member. It becomes more preferable in preventing deformation.
Second, when the tool is advanced from the rear side of the vehicle toward the spare tire carrier in order to operate the spare tire carrier, the pair of side wall portions can function as guides for the tool. In this case, as the tip of the tool is advanced so as to be closer to the spare tire carrier, the distance between the pair of side wall portions becomes narrower, so that the tip of the tool can be guided to a predetermined position on the spare tire carrier more accurately. Therefore, it is very convenient.
Thirdly, since the vertical member is used as a bracket for the spare tire carrier, it is not necessary to separately provide a dedicated member for attaching the spare tire carrier. Therefore, it is possible to further promote weight reduction and reduction of manufacturing cost.

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

It is a schematic perspective view of the main part which shows an example of the lower structure of the vehicle which concerns on this invention. It is a plane explanatory view of the main part which showed the lower structure of the vehicle shown in FIG. 1 simply. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 6 is a sectional view taken along line IV-IV of FIG. (A) is a perspective view of a vertical member used in the lower structure of the vehicle shown in FIG. 1, and (b) is an exploded perspective view thereof. It is explanatory drawing of the main part plane which shows the other example of this invention. It is a plane explanatory view of the main part which shows the other example of the substructure of a vehicle.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
In the drawings, the arrow Fr indicates the front of the vehicle, the arrow W indicates the vehicle width direction, and the arrow Up indicates the upper direction in the vehicle height direction.

The vehicle substructure A shown in FIGS. 1 and 2 is applied to a rear portion of the vehicle V provided with a back door opening 10 opened and closed by a back door (not shown), and a pair of left and right side members 2 , A lower back 3, a cross member 4, a vertical member 5, a spare tire carrier 6 capable of holding a spare tire 91 (omitted in FIGS. 1 and 2), and a floor panel 11. The lower back 3 corresponds to the "cross member" in the present invention. Therefore, the combination of the lower back 3 and the cross member 4 corresponds to the "plurality of cross members" in the present invention.

The pair of side members 2 are members located on both left and right sides of the lower portion of the vehicle V and extending in the front-rear direction of the vehicle. The lower back 3 is located at the rear end of the vehicle V to form the lower edge portion of the back door opening 10, extends in the vehicle width direction, and is connected to the rear end portions of the pair of side members 2 in a bridging manner. There is. The cross member 4 is located in front of the vehicle of the lower back 3 and extends in the vehicle width direction, and is connected to the pair of side members 2 in a bridging manner like the lower back 3. The floor panel 11 is arranged and joined on the upper side of the pair of side members 2, the lower back 3, and the cross member 4 described above.

As is well shown in FIG. 5, the vertical member 5 is formed by combining the vertical member main body portion 50 and the auxiliary plate portion 51, and is preferably symmetrical. The vertical member main body 50 and the auxiliary plate 51 are formed by, for example, pressing a metal plate, and the vertical member main body 50 is a plan view trapezoidal upper plate portion 50a and the upper plate portion 50a. It is provided with a pair of side wall portions 50b protruding downward from the left and right side edge portions of the above, and a substantially horizontal plate-shaped flange portion 50c connected to the lower ends of these side wall portions 50b. A spare tire carrier 6 is attached to the vertical member main body 50, and this point will be described later. The auxiliary plate portion 51 has a substantially trapezoidal shape having a shape and size corresponding to the upper plate portion 50a of the vertical member main body portion 50, and has an opening 52 for avoiding interference with the spare tire carrier 6, which will be described later. It is formed. The vertical member 5 is assembled in a state where the auxiliary plate portion 51 is joined to the lower surface of the flange portion 50c of the vertical member main body portion 50. The front portion 51a and the rear portion 51b of the auxiliary plate portion 51 protrude to the front side and the rear side of the vertical member main body portion 50, respectively, and a plurality of bolt insertion holes 53 are provided in these portions.

As shown in FIGS. 3 and 4, the vertical member 5 is connected to the lower back 3 and the cross member 4 in a bridge shape at a substantially central portion in the vehicle width direction. As a means for connecting the vertical members 5, for example, a means for fastening the front portion 51a and the rear portion 51b of the auxiliary plate portion 51 of the vertical member 5 to the lower wall portions of the cross member 4 and the lower back 3 by using bolts 90 is adopted. Preferably, the front end and the rear end of the vertical member main body 50 are joined to the rear surface portion of the cross member 4 and the front end portion of the lower back 3 by means such as welding.

As is well shown in FIG. 2, the pair of side wall portions 50b of the vertical members 5 have an appropriate angle α with respect to the vehicle front-rear direction so that the mutual spacing wa becomes narrower toward the front side of the vehicle. It is tilted. Therefore, the pair of side wall portions 50b diagonally intersect the lower back 3 and the cross member 4 at the above-mentioned angle α in a plan view.

A spare tire carrier 6 is arranged inside the vertical member 5. The spare tire carrier 6 is the same as that described in Patent Document 1, and as shown in FIGS. 3 and 4, a chain having a locking member 60 at the lower end for suspending and holding the spare tire 91. A 61, a wheel 62 for winding the chain 61, and an operation shaft portion 63 connected to the wheel 62 are provided. Openings 30a and 30b for inserting the tool 92 for operating the spare tire carrier 6 are provided on the rear surface portion and the front surface portion of the lower back 3, and the tool 92 is opened from the rear side of the vehicle V. , 30b, and by fitting the tip of the tool 92 into the operating shaft 63 and rotating it, the chain 61 is wound or unwound by the wheel 62, and the spare tire 91 is attached to the vertical member 5. It is possible to arrange and hold the spare tire 91 on the lower surface side, and to lower the spare tire 91 below the vertical member 5 to remove it. When the spare tire 91 is held by the spare tire carrier 6, the lower surface side of the spare tire 91 may be covered with a cover case (not shown) in order to protect the spare tire 91. The mutual region between the pair of side wall portions 50b of the vertical member 5 is a path for passing the tool 92.

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

First, as described above, the pair of side wall portions 50b of the vertical member 5 are inclined at an appropriate angle α with respect to the vehicle front-rear direction, and are obliquely connected to the lower back 3 and the cross member 4. There is. Therefore, the vertical member 5 exerts the same function as the diagonal member of the truss structure, and when the side member 2, the lower back 3, the cross member 4 and the vertical member 5 receive a load in the horizontal direction, the matchbox is deformed. Is effectively suppressed. As a result, the body rigidity of the lower part of the vehicle V can be appropriately increased without adding a large reinforcing member separately or increasing the wall thickness of each part.

Since the spare tire carrier 6 is provided on the vertical member 5, it is not necessary to separately provide a dedicated member for attaching the spare tire carrier 6. When the spare tire carrier 6 is operated by using the tool 92, the pair of side wall portions 50b of the vertical member 5 function as guides for the tool 92. That is, when the tool 92 is inserted into the openings 30a and 30b of the lower back 3 from the rear of the vehicle and approaches the spare tire carrier 6, if the orientation of the tool 92 is inappropriate, the tip portions of the tool 92 are paired. Abuts on any of the side wall portions 50b of the. Further, since the mutual distance between the pair of side wall portions 50b becomes narrower toward the front, the tool 92 is naturally guided to the position of the spare tire carrier 6 or its vicinity. Therefore, the work of fitting the tool 92 to the operating shaft portion 63 of the spare tire carrier 6 can be facilitated, which is convenient for the user.

6 and 7 show other embodiments. In these figures, elements that are the same as or similar to those of the embodiment are designated by the same reference numerals as those of the embodiment, and duplicate description will be omitted.

In the embodiment shown in FIG. 6, the orientation of the vertical member 5 is opposite to that of the embodiment, and the mutual spacing wa of the pair of side wall portions 50b is narrower on the rear side than on the front side. ing.
Even with such a configuration, it is possible to appropriately obtain the matchbox deformation suppressing effect intended by the present invention.

In the embodiment shown in FIG. 7, of the pair of side wall portions 50b and 50b'of the vertical members 5, one side wall portion 50b is inclined with respect to the vehicle front-rear direction, but the other side wall portion 50b'is the front and rear of the vehicle. Not tilted with respect to direction.
Even with such a configuration, one side wall portion 50b exerts a matchbox deformation suppressing effect .

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of each part of the substructure of the vehicle according to the present invention can be variously redesigned within the scope intended by the present invention.

In the above-described embodiment, the vertical member 5 is configured to include the auxiliary plate portion 51, and the strength of the vertical member 5 itself is also increased, but the present invention is not limited to this, for example, the auxiliary plate portion 51. It may be configured to consist only of the vertical member main body 50 without the above . The vertical member may be formed by using, for example, a member having an L-shaped cross section. The side wall portion of the vertical member may be in a posture in which the vertical member is erected in the vertical and diagonal directions instead of the posture in which the vertical member is erected in the vertical height direction, and may be in a downward standing posture or an upward standing posture. Further, the vertical members are connected to a plurality of cross members in a bridging manner, but the number of cross members is not limited to two, and for example, the vertical members are provided in a state of being bridged to three or more cross members. You may.
Although it is not so preferable from the viewpoint of weight reduction and simplification of the structure, in the present invention, it is possible to provide a plurality of vertical members.

In the above-described embodiment, the lower back 3 is one of the cross members, but the present invention is not limited to this, and the plurality of cross members referred to in the present invention may be cross members that do not include the lower back. The lower structure of the vehicle according to the present invention can be applied not only to the structure of the rear portion of the vehicle but also to the structure of the front portion or the center portion of the vehicle.

The structure in which the spare tire carrier is provided on the vertical member is effective for a vehicle having a structure in which a recess for accommodating the spare tire is not formed on the rear floor and the spare tire is suspended and held on the lower surface side of the vehicle. However, even in a vehicle in which a recess for accommodating a spare tire is formed on the rear floor, if a vertical member can be provided on the lower surface side of the rear floor, the configuration intended by the present invention can be appropriately constructed. ..

A Vehicle substructure V Vehicle 2 Side member 3 Lower back (equivalent to cross member)
4 Cross member 5 Vertical member 50b Side wall (of vertical member)
6 Spare tire carrier 91 Spare tire 92 Tools

Claims (2)

A pair of left and right side members that are located on both the left and right sides of the lower part of the vehicle and extend in the front-rear direction of the vehicle,
A plurality of cross members that extend in the vehicle width direction and are connected to the pair of side members in a bridging manner and are located at intervals in the vehicle front-rear direction.
At least one side wall portion that is located closer to the center in the vehicle width direction than the pair of side members, is connected to the plurality of cross members in a bridging manner, and stands up in the vertical height direction or the vertical diagonal direction. With vertical members
The substructure of the vehicle, which is equipped with
The vertical member includes a plate-shaped member in the shape of a plan view trapezoid, and the side wall portion is provided so as to be bent-likely connected to both side edges of the plate-shaped member in the vehicle width direction and spaced apart in the vehicle width direction. It has a pair of side walls and
These pair of side wall portions extend linearly at an angle inclined obliquely with respect to the front-rear direction of the vehicle over the entire length range from one cross member to the other cross member among the plurality of cross members. The substructure of the vehicle, which is symmetrical in a plan view centered on a straight line extending in the front-rear direction of the vehicle. The substructure of the vehicle according to claim 1.
Of the plurality of cross members, one cross member is a lower back located near the rear end of the vehicle.
The vertical member is provided with a spare tire carrier capable of holding a spare tire.
The vertical member has a pair of left and right side wall portions located on both sides of the vertical member in the vehicle width direction as the side wall portions, and the pair of side wall portions are spaced apart from each other in the vehicle width direction toward the front side of the vehicle. Both extend in a direction that is tilted diagonally with respect to the front-rear direction of the vehicle so that
A vehicle structure in which a region between the pair of side wall portions serves as a passage for advancing a tool for operating the spare tire carrier from the rear side of the vehicle toward the spare tire carrier.

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