JP2012166599A - Vehicle body structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage of a lower structure due to bending of a frame upon vehicle collision.SOLUTION: In a vehicle including a backbone stringer 7 which is provided on a body and extends in a vehicle front and rear direction between a pair of right and left side members and whose front end is connected to the side members, the backbone stringer 7 is cut at an intermediate part thereof and disposed to be separated from each other in the vehicle front and rear direction and the part, which is cut, of the backbone stringer 7 is connected by a slide frame 20 of a front seat 16 disposed on an upper part of the backbone stringer 7.

Description

  The present invention relates to a vehicle body structure, and relates to a frame shape of a lower part of the vehicle body.

In recent years, in order to reduce design costs and component costs, an electric vehicle based on a gasoline engine vehicle has been developed as much as possible to share a vehicle body and the like.
As described above, in an electric vehicle based on a gasoline engine vehicle, a battery is usually mounted under the floor panel in order to secure a space such as a luggage compartment.
Incidentally, in a vehicle such as a gasoline engine vehicle or an electric vehicle, generally, a pair of left and right side members extending in the vehicle front-rear direction is provided as a strength member at the lower portion of the vehicle body. Furthermore, in order to improve the strength of the vehicle body, there is a vehicle provided with a frame extending in the vehicle front-rear direction below the floor panel. The frames are arranged substantially parallel to each other between the side members, and both ends are fixed to a cross member provided between the side members (Patent Document 1).

Japanese Patent No. 428684

  When the vehicle body including the side member and the frame as described in Patent Document 1 is used for an electric vehicle, for example, the battery is disposed below the floor panel as described above, and is protected in a side collision. Arranged between the side members for illustration. Therefore, the battery is disposed so as to overlap the frame when viewed from above. Therefore, for example, when an excessive load is applied to the vehicle during a frontal collision, the frame may buckle and bend downward together with the side members, and the battery may be damaged by the frame.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a vehicle body structure capable of preventing damage to a lower vehicle structure due to bending of a frame at the time of a collision. It is in.

  In order to achieve the above object, a vehicle body structure according to claim 1 is provided on a vehicle body, and is disposed between a pair of left and right side members extending in the vehicle front-rear direction and the pair of side members. A frame that extends and has a front end fixed to the side member, the frame being cut at an intermediate portion and spaced apart from each other in the vehicle front-rear direction, and connecting the cut portion of the frame above the frame A connecting means is provided.

A vehicle body structure according to a second aspect of the present invention is the vehicle body structure according to the first aspect, wherein the side member and the frame are arranged below a floor panel of the vehicle.
According to a third aspect of the present invention, there is provided a vehicle body structure according to the second aspect, wherein the vehicle is an electric vehicle in which a battery for storing driving power is disposed below the floor panel.
According to a fourth aspect of the vehicle body structure of the present invention, in any one of the first to third aspects, the connecting means is a slide frame that is a support member for a front seat of the vehicle.

  A vehicle body structure according to a fifth aspect of the present invention is the vehicle body structure according to any one of the first to fourth aspects, wherein the side member is bent outward in the left-right direction of the vehicle at a fixed position with the front end of the frame. It is characterized by being.

According to the first aspect of the present invention, since the frame provided between the side members is cut at the intermediate portion and is spaced apart from each other in the vehicle front-rear direction, the frame faces the frame from the front to the rear when the vehicle collides forward. Even if an excessive load is applied, the frame does not bend, and therefore it is possible to prevent damage to surrounding vehicle structures due to the bending of the frame.
Furthermore, since the connecting means for connecting the cut part of the frame is provided above the frame, the load acting on the frame from the front to the rear is smoothly transmitted to the rear of the vehicle body by the connecting means. Therefore, the strength of the vehicle body can be ensured even when the frame is cut at the intermediate portion.

According to the invention of claim 2, since the side member and the frame are disposed below the floor panel of the vehicle, the vehicle structure disposed below the floor panel is not damaged by the bending of the frame. Can be prevented.
According to the invention of claim 3, since the battery for storing the travel drive power as the travel drive power source is disposed below the floor panel, the battery can be prevented from being damaged due to the bending of the frame.

In addition, since the frame is cut at the middle part and spaced apart from each other in the vehicle front-rear direction, the space between the separated frames can be used as a space for mounting the battery, and the capacity of the battery is increased. Can do.
Further, according to the invention of claim 4, since the connecting means for connecting the cut parts of the frame is a slide frame in the front seat of the vehicle, the connecting means is used by utilizing parts already provided in the vehicle. It can be provided, and an increase in the number of parts can be suppressed.

  According to the invention of claim 5, since the side member is formed to be bent outward in the left-right direction of the vehicle at a fixed position with the front end portion of the frame, the side member is excessively moved from the front at the time of a frontal collision of the vehicle. Even if a heavy load is applied, the side member bends outward in the lateral direction of the vehicle. Therefore, the vehicle structure disposed between the side members can be more reliably protected.

It is a side view showing the structure of the body of the vehicle concerning the embodiment of the present invention. It is a top view which shows the structure of the body of the vehicle which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the backbone stringer under the front seat. It is a top view which shows the structure of the body of the vehicle which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a structure of a body 2 of a vehicle 1 according to an embodiment of the present invention.
FIG. 2 is a plan view showing the structure of the body 2 of the vehicle 1.
The vehicle 1 of the present embodiment is an electric vehicle equipped with a large-capacity battery 3 and an electric motor (not shown) as a travel drive source. The body 2 (vehicle body) of the vehicle 1 has a specification that can also be used in a gasoline engine vehicle.

As shown in FIGS. 1 and 2, the vehicle 1 includes a U-shaped side member 5 and a backbone stringer 7 (frame) as a skeleton member of the body 2 at the bottom.
The side members 5 extend in the vehicle front-rear direction and are provided on the left and right sides. The front end 5 a of the side member 5 is connected by a cross member 9 that supports the bumper 8. The rear end portion 5b of the side member 5 is fixed to the body rear portion 2a.

  Two backbone stringers 7 are provided between the side members 5 at intervals in the left-right direction of the vehicle, and are arranged so as to extend in the vehicle front-rear direction. The front end portion 7a of the backbone stringer 7 is bent outward in the left-right direction of the vehicle in the vicinity of the front end portion of the floor panel 10 serving as a floor portion of the passenger compartment, and is fixed to the left and right side members 5, respectively. The rear end portion 7b of the backbone stringer 7 is fixed to the body rear portion 2a.

The side member 5 and the backbone stringer 7 are disposed below the floor panel 15 and have a function of supporting the floor panel 15.
The battery 3 is disposed below the floor panel 15. As described above, the battery 3 has a large capacity as a power supply source of the electric motor for driving driving, that is, a battery having a relatively large outer shape, and uses the space between the side members 2 almost fully. The left and right width dimensions.

Further, cross members 17a and 17b extending in the left-right direction of the vehicle are provided below the left and right front seats 16 of the vehicle 1, respectively. The cross members 17a and 17b are arranged in pairs on the left and right sides with an interval in the longitudinal direction of the vehicle, and connect the side member 5 and the backbone stringer 7.
FIG. 3 is an explanatory view showing the structure of the backbone stringer 7 below the front seat 16.

As shown in FIG. 3, in the present embodiment, the backbone stringer 7 is cut below the front seat 16 and is spaced apart in the vehicle front-rear direction, and the portion between the cross members 17a and 17b is removed. It has a structure like this.
Further, end portions of slide rails 20a and 20b (connection means) which are slide support members of the front seat 16 are fastened to the upper surfaces of the cross members 17a and 17b by bolts via brackets 21, respectively. The slide rails 20a, 20b are provided in a pair so as to be separated from each other in the vehicle left-right direction, and are connected to a pair of cross members 17a, 17b separated from each other in the vehicle front-rear direction. Yes. The inner one (20a) of the pair of slide rails 20a and 20b is disposed close to the upper side of the backbone stringer 7. Therefore, the cut portion of the backbone stringer 7 has a structure connected by the slide rail 20a via the cross members 17a and 17b and the bracket 21.

Further, between the cross members 17a and 17b, the floor panel 15 is bent upward to form a convex portion 15a.
With the structure as described above, in the present embodiment, for example, a load input from the vehicle front end during a frontal collision is transmitted to the body rear portion 2a by the side member 5. Furthermore, since the backbone stringer 7 is provided between the side members 5, the load input to the side member 5 from the front of the vehicle can be divided and received, and the strength of the central portion of the body 2 can be improved.

  In particular, in the present embodiment, the portion between the cross members 17a and 17b of the backbone stringer 7 is cut and removed. Even if a heavy load is applied, the backbone stringer 7 does not bend, and thus the backbone stringer 7 can be prevented from protruding downward, and the battery 3 can be prevented from being damaged.

  Further, since the cut portions of the backbone stringer 7 are connected by the slide rail 20, it is possible to suppress the strength reduction of the central portion of the body 2 due to the cutting of the backbone stringer 20. Moreover, since the edge part of the site | part by which the backbone stringer 7 was cut | disconnected is fixed to the side member 5 via the cross members 17a and 17b, the strength reduction of the center part of the body 2 can further be suppressed.

  In addition, since the portion between the cross members 17a and 17b of the backbone stringer 7 is cut and removed, the battery 3 is disposed above the cross members 17a and 17b without interfering with the backbone stringer 7. Can be made. Further, since the floor panel 15 is protruded upward between the cross members 17a and 17b and the convex portion 15a is provided, the dead space under the front seat 16 can be effectively used as the mounting space for the battery 3. As a result, the mounting space of the battery 3 can be increased and the battery capacity can be increased.

Further, since the slide rail 20a of the front seat 16 already provided is used to connect the cut portions of the backbone stringer 7, it is not necessary to newly provide a connecting member, and the number of parts can be reduced. Increase can be suppressed.
In this embodiment, the cross members 17a and 17b are provided for the left and right front seats. However, if there is no structure at the center in the left and right direction of the vehicle 1, the left and right cross members 17a and 17b are connected, A structure may be used in which the left and right side members 5 are connected by a single cross member. Thereby, the intensity | strength of the cross member 5 can be improved significantly and, therefore, the intensity | strength of the center part of the body 2 can be improved more.

FIG. 4 is a top view showing the structure of the body 2 of the vehicle 1 in another embodiment of the present invention.
As shown in FIG. 4, the side member 5 may be further bent outward in the vehicle left-right direction in the vicinity of a fixed portion with the front end portion 7 a of the backbone stringer 7. With such a structure, even if an excessive load acts on the side member 5 from the front during a frontal collision, the side member 5 bends outward in the left-right direction of the vehicle. Therefore, the battery 3 disposed between the side members 5 can be more reliably protected. Further, since the front end portion 7a of the backbone stringer 7 is fixed to the bent portion of the side member 5, the structure has an effect of suppressing the buckling of the side member 5 and the strength of the body 2 is sufficiently secured. It has become.

In the above embodiment, the front end of the backbone stringer 7 is directly fixed to the side member 5, but the present invention is not limited to this. For example, the front end of the backbone stringer 7 and the side member via a cross member are used. The present invention can also be applied to a vehicle having a body with a structure fixed to the vehicle.
Further, in the above embodiment, the battery 3 can be protected by bending the backbone stringer 7, but the protection can be achieved even with a vehicle structure other than the battery disposed below the backbone stringer 7.

  Moreover, in the above embodiment, the vehicle body structure of the present invention is applied to an electric vehicle, but it can also be applied to a hybrid vehicle or a gasoline engine vehicle. For example, in a gasoline engine vehicle, when a gasoline tank is provided under the front seat, the gasoline tank can be protected.

2 Body 5 Side member 7 Backbone stringer 15 Floor panel 20a Slide rail

Claims (5)

A pair of left and right side members provided in the vehicle body and extending in the vehicle longitudinal direction;
A frame disposed between the pair of side members, extending in the vehicle front-rear direction and having a front end fixed to the side members,
The frame is cut at an intermediate portion and is spaced apart from each other in the vehicle longitudinal direction,
A vehicle body structure for a vehicle, comprising connecting means for connecting a cut portion of the frame above the frame.   The vehicle body structure according to claim 1, wherein the side member and the frame are disposed below a floor panel of the vehicle.   The vehicle body structure according to claim 2, wherein the vehicle is an electric vehicle in which a battery for storing driving power is disposed below the floor panel.   The vehicle body structure according to any one of claims 1 to 3, wherein the connecting means is a slide frame that is a support member for a front seat of the vehicle.   The vehicle body according to any one of claims 1 to 4, wherein the side member is formed to bend outward in the left-right direction of the vehicle at a fixed position with respect to a front end portion of the frame. Construction.

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