JP2010023538A - Vehicle body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body structure capable of suppressing deformation of a floor panel. <P>SOLUTION: The vehicle body structure includes: a floor panel 2 which forms a car interior floor; a tunnel part 9 extending in an anteroposterior direction of the car body in the floor panel; a side sill 10 extending in the anteroposterior direction of the car body at both ends in a body width direction of the floor panel; a front side frame 12 extending from the front end of the floor panel forwardly in the anteroposterior direction of the car body; and a floor frame 14 extending from the front end of the floor panel or its vicinity rearwardly in the anteroposterior direction of the car body between the tunnel part and the side sill. A fragile part 14a having less strength than other parts of the floor frame is formed in the vicinity of the front end of the floor panel of the floor frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body structure, and more particularly, to a vehicle body structure having a floor frame extending in the longitudinal direction of a vehicle body from a front edge portion of a floor panel or the vicinity thereof between a tunnel portion and a side sill.

  2. Description of the Related Art Conventionally, there has been known a vehicle body structure that absorbs energy by dispersing a collision load by connecting side frames that extend linearly in the vehicle longitudinal direction to a reinforcing member and a cross member (Patent Document 1).

Japanese Patent Laying-Open No. 2005-041247

  However, in the conventional structure as described above, a load is input to the vehicle body longitudinal frame, particularly a frame (floor frame) extending in the vehicle longitudinal direction between the floor tunnel and the side sill in a frontal collision or offset collision. Then, even if the load is distributed, the frame itself may recede, which causes shear deformation in the entire floor panel, and stress is applied to the welded part between the floor panel and the side sill and the floor panel and the floor frame. There was a problem that the bonds might break due to concentration. Such deformation of the floor panel causes the deformation of the cabin and may cause occupant injury.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a vehicle body structure that can suppress deformation of a floor panel.

  In order to achieve the above object, according to the vehicle body structure of the present invention, a floor panel that forms a passenger compartment floor, a tunnel portion that extends in the vehicle body longitudinal direction, and both edges of the floor panel in the vehicle width direction are provided. A side sill extending in the longitudinal direction of the vehicle body, a front side frame extending from the front edge of the floor panel toward the front in the longitudinal direction of the vehicle body, and a rear edge from the front edge of the floor panel or its vicinity between the tunnel portion and the side sill. A floor frame extending in the longitudinal direction of the vehicle body, and a weakened portion having a lower strength than that of other floor frame portions is formed at a position near the front edge of the floor panel of the floor frame. It is characterized by.

  In the present invention configured as described above, since the impact force at the time of a frontal collision including an offset collision (at the time of a normal collision) is received by the fragile portion provided in the floor frame, the portion behind the fragile portion of the floor frame recedes. Since this weak part is provided in the part near the front edge part of the floor panel of the floor frame, the part which is the most part of the floor panel behind the weak part is deformed. Can be prevented. As a result, the cabin can be prevented from being deformed and causing occupant injury. Furthermore, since the deformation of the entire floor panel is suppressed if the weakened portion is provided only in a part of the floor frame, it is not necessary to provide a reinforcing member on the entire floor panel, and the weight of the vehicle body can be reduced.

In the present invention, preferably, the floor panel is provided with a reinforcing member having one end near the fragile portion and extending from the one end toward the periphery.
In the present invention configured as described above, the reinforcing member having one end portion in the vicinity of the fragile portion and extending from the one end portion toward the periphery in accordance with the deformation of the fragile portion. Can be suppressed. Thus, the deformation | transformation of the whole floor panel can be suppressed by the combination of a weak part and a reinforcement member. Further, the combination of the fragile portion and the reinforcing member eliminates the need to provide the reinforcing member on the entire floor panel, so that the deformation of the floor panel can be suppressed without increasing the weight and at a low cost.

In the present invention, preferably, the other end of the reinforcing member extends to the vicinity of the side sill or is connected to the side sill.
In this invention comprised in this way, a deformation | transformation of the floor panel of a weak part vicinity can be suppressed more reliably.

In the present invention, preferably, the other end portion of the reinforcing member extends to the vicinity of the tunnel portion or is connected to the tunnel portion.
In this invention comprised in this way, a deformation | transformation of the floor panel of a weak part vicinity can be suppressed more reliably.

In the present invention, preferably, the vehicle has a torque box extending in the vehicle width direction at the front edge of the floor panel, and the other end of the reinforcing member extends to the vicinity of the torque box or is connected to the torque box. ing.
In this invention comprised in this way, a deformation | transformation of the floor panel of a weak part vicinity can be suppressed more reliably.

In the present invention, preferably, the vehicle has a cross member extending in the vehicle width direction at the front edge of the floor panel, and the other end of the reinforcing member extends to the vicinity of the cross member or is connected to the cross member. ing.
In this invention comprised in this way, a deformation | transformation of the floor panel of a weak part vicinity can be suppressed more reliably.

In the present invention, preferably, the reinforcing member is a member that extends substantially linearly, and extends obliquely with respect to the vehicle body longitudinal direction in which the floor frame extends.
In this invention comprised in this way, the shear deformation of a floor panel which arises by a deformation | transformation of a weak part can be suppressed more reliably.

In the present invention, preferably, the reinforcing members are respectively provided on both sides of the floor frame in the vehicle width direction, and both of them are members that extend substantially linearly, and these reinforcing members are front and rear of the vehicle body from which the floor frame extends. It is provided so as to extend obliquely with respect to the direction and have a V shape in plan view.
In this invention comprised in this way, the shear deformation of a floor panel which arises by a deformation | transformation of a weak part can be suppressed more reliably.

In the present invention, preferably, the reinforcing member extends at an angle of approximately 45 degrees with respect to the vehicle longitudinal direction in which the floor frame extends.
In this invention comprised in this way, the shear deformation of the floor panel which arises by a 45-degree angle with the direction where a floor frame extends, which arises by a deformation | transformation of a weak part can be suppressed more reliably.

Moreover, in this invention, Preferably, the weak part is formed with the tailored blank.
In this invention comprised in this way, a weak part can be formed at lower cost.

In the present invention, preferably, the weak part is formed of the same thickness as that of the other floor frame and is made of a material different from that of the other floor frame.
In the present invention configured as described above, even if the weakened portion is provided, the weakened portion is formed in the same plate thickness as that of the other floor frame portion and is formed of a material different from that of the other floor frame portion. Therefore, it is possible to suppress an increase in NVH by maintaining the static rigidity of the floor panel and converting the vibration energy transmitted from the engine and wheels by the frame into strain energy at the weak part.

In the present invention, preferably, a front end portion of the floor frame is connected to a rear end portion of the front side frame.
In this invention comprised in this way, the deformation | transformation of a floor panel can be suppressed by the energy absorption by a weak part more effectively at the time of a front collision.

  According to the vehicle body structure of the present invention, the deformation of the floor panel can be suppressed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a bottom view of a vehicle to which a vehicle body structure according to an embodiment of the present invention is applied as viewed from below.
As shown in FIG. 1, the vehicle 1 has a front floor panel 2 and a rear floor panel 4. A toe board 6 extending obliquely upward and forward from the front edge is formed on the front edge of the front floor panel 2, and a dash panel 8 extending upward from the upper edge is formed on the upper edge of the toe board 6. Is formed. In addition, a floor tunnel 9 that bulges upward in the vehicle longitudinal direction is formed at the center of the front floor panel 2 in the vehicle width direction.

  A pair of left and right side sills 10 extending in the longitudinal direction of the vehicle body is provided at both edges of the front floor panel 2, and a pair of left and right front side frames 12 are provided in front of the front floor panel 2. The front side frame 12 extends to the front end of the vehicle and receives collision energy at the time of a normal collision.

  The front side frame 12 extends to a front edge portion of the front floor panel 2, and a floor frame 14 is connected to the rear end portion thereof. The floor frame 14 extends from the front floor panel 2 in the longitudinal direction of the vehicle body and terminates at the rear floor panel 4. The floor frame 14 is formed in a U-shaped cross section, and is attached to the bottom surface portion of the front floor panel 2 by welding from below to form a closed cross section.

  A pair of left and right torque boxes 16 are formed on the outer side in the vehicle width direction of the rear end portion of the front side frame 12 and the front end portion of the floor frame 14. A pair of left and right cross members 18 are provided on the inner side in the vehicle width direction of the rear end portion of the front side frame 12 and the front end portion of the floor frame 14, and from the inner end portions of these cross members 18, A tunnel side frame 19 extending toward the center is provided.

  In addition, the code | symbol 14a is a weak part provided in 1st Embodiment and 2nd Embodiment, and the codes | symbols 30 and 32 are reinforcement members provided in 2nd Embodiment.

  Next, a floor structure to which the vehicle body structure according to the first embodiment of the present invention is applied will be described with reference to FIGS. FIG. 2 is a bottom view of the floor structure to which the vehicle body structure according to the first embodiment of the present invention is applied as viewed from below the vehicle body, and FIG. 3 illustrates the fragile portion of the floor frame according to the first embodiment of the present invention. It is the bottom view seen from the bottom.

As shown in FIGS. 2 and 3, the floor frame 14 is provided with a fragile portion (low strength region) 14 a, and the material of the fragile portion 14 a has other strength or yield stress than other portions of the floor frame 14. It is lower than the material of 14b. In this embodiment, although the kind of steel plate is changed, the plate | board thickness of this weak part 14a may be set smaller than the plate | board thickness of the other part 14b. As shown in FIG. 2, the weakened portion 14 a is provided in a portion near the front edge portion of the floor panel 2 of the floor frame 14.
This weak part 14a is formed by the tailored blank, and is formed by laser welding along the line like 14c shown in FIG. The length in the front-rear direction of the fragile portion 14a is preferably set to about 30 mm to 50 mm.

  According to such a 1st embodiment, since the impact force at the time of a frontal collision is received in weak part 14a whose intensity or yield stress is smaller than other parts 14b, portion 14b behind floor weak part 14a of floor frame 14 is formed. Retreating can be suppressed. And since this weak part 14a is provided in the part near the front edge part of the floor panel 2 of the floor frame 14, it can prevent that most parts of the floor panel 2 behind the weak part 14a deform | transform. . As a result, the cabin can be prevented from being deformed and causing occupant injury. Furthermore, since the deformation of the entire floor panel 2 can be suppressed by providing the fragile portion 14a only on a part of the floor frame 14, it is not necessary to provide a reinforcing member on the entire floor panel 2 and the weight of the vehicle body can be reduced. I can plan.

  Next, a floor structure to which the vehicle body structure according to the second embodiment of the present invention is applied will be described with reference to FIG. FIG. 4 is a bottom view of the floor structure to which the vehicle body structure according to the second embodiment of the present invention is applied as viewed from below the vehicle body.

  As shown in FIG. 4, a fragile portion 14 a similar to that of the first embodiment is provided in a portion of the floor frame 14 near the front edge portion of the floor panel 2. Similar to the first embodiment, the fragile portion 14a is formed of a tailored blank, and its strength or yield stress is lower than that of the other portion 14b of the floor frame 14.

  As shown in FIG. 4, the front floor panel 2 has one end portions 30a and 32a in the vicinity of the fragile portion 14a, and the first reinforcing member 30 and the second reinforcing member extending obliquely forward from the one end portion 30a. 32 is attached. These reinforcing members 30 and 32 are provided so as to extend at an angle of 45 degrees with respect to the vehicle body longitudinal direction in which the floor frame 14 extends. These reinforcing members 30 and 32 are bonded by welding with patchworks to the floor of the steel plate. Moreover, you may make it form a closed cross section with members, such as a U-shape.

  One end portions 30 a and 32 a of these reinforcing members 30 and 32 are formed along the floor frame 14 in the vicinity of the floor frame 14 with a slight gap therebetween. The other end 30 b of the first reinforcing member 30 extends to the vicinity of the cross member 18 and the tunnel side frame 19, and has a shape along the cross member 18 and the tunnel side frame 19. Note that the other end 30 b of the first reinforcing member 30 may extend to the vicinity of one of the cross member 18 and the tunnel side frame 19. Further, the other end 30 b of the first reinforcing member 30 may be coupled to both or one of the cross member 18 and the tunnel side frame 19.

  The other end 32 b of the second reinforcing member 32 extends to the vicinity of the torque box 16 and the side sill 10 and has a shape along the torque box 16 and the side sill 10. Note that the other end 32 b of the second reinforcing member 32 may extend to the vicinity of one of the torque box 16 and the side sill 10. Further, the other end 32b of the second reinforcing member 32 may be coupled to both or one of the torque box 16 and the side sill 10.

  According to such 2nd Embodiment, like the 1st Embodiment, the impact force at the time of a frontal collision is received by the weak part 14a, and it is suppressed that the part 14b behind the weak part 14a of the floor frame 14 reverse | retreats. I can do it. And it can prevent that most parts of the floor panel 2 behind the weak part 14a provided in the part near the front edge part of the floor panel 2 deform | transform.

  Here, it is known that, for example, when the fragile portion 14a is deformed in the longitudinal direction of the vehicle body in a normal collision, the front floor panel 2 is subjected to shear deformation. In general, in the case of a steel plate, a portion where the shear stress increases at an angle of 45 degrees with respect to the vehicle body longitudinal direction in which the floor frame 14 extends extends, and shear strain or shear deformation occurs in that portion.

  On the other hand, in the present embodiment, the reinforcing members 30 and 32 are provided so as to extend at an angle of 45 degrees with respect to the vehicle body longitudinal direction in which the floor frame 14 extends. Therefore, the fragile portion 14a accompanying the deformation of the fragile portion 14a. The deformation of the floor panel 2 around can be suppressed by the reinforcing members 30 and 32 having the one end portions 30a and 32a in the vicinity of the fragile portion 14a and extending from the one end portion toward the periphery.

  Thus, the deformation of the entire floor panel 2 can be suppressed by the combination of the fragile portion 14a and the reinforcing members 30 and 32. Further, the combination of the fragile portion 14a and the reinforcing members 30 and 32 eliminates the need to provide a reinforcing member over the entire floor panel 2, thereby suppressing the deformation of the floor panel without increasing the weight and at a low cost. I can do it. In addition, even when only one of the reinforcing members 30 and 32 is provided, the same effect is exhibited.

  As a result, the cabin can be prevented from being deformed and causing passenger injury. Furthermore, if the fragile portion 14a can be provided only at a part of the floor frame 14 and the reinforcing members 30 and 32 are provided, deformation of the entire floor panel 2 is suppressed, so that the reinforcing member need not be provided on the entire floor panel 2. It is possible to reduce the weight of the vehicle body.

It is the bottom view which looked at the vehicle to which the vehicle body structure by embodiment of this invention was applied from the downward direction. It is the bottom view which looked at the floor structure to which the vehicle body structure by 1st Embodiment of this invention was applied from the vehicle body downward. It is the bottom view which looked at the weak part of the floor frame by a 1st embodiment of the present invention from the lower part of the body. It is the bottom view which looked at the floor structure to which the vehicle body structure by 2nd Embodiment of this invention was applied from the vehicle body downward.

Explanation of symbols

2 Front floor panel 6 Toe board 9 Floor tunnel 10 Side sill 12 Front side frame 14 Floor frame 16 Torque box 18 Cross member 19 Tunnel side frames 30, 32 Reinforcing members 30a, 32a One end 30b, 32b The other end

Claims (12)

A floor panel that forms a passenger compartment floor, a tunnel portion that extends in the vehicle longitudinal direction of the floor panel, a side sill that extends in the vehicle longitudinal direction at both edges in the vehicle width direction of the floor panel, and a front edge portion of the floor panel A front side frame extending toward the front in the longitudinal direction of the vehicle body, and a floor frame extending in the longitudinal direction of the vehicle body from the front edge of the floor panel or the vicinity thereof to the rear between the tunnel portion and the side sill. A vehicle body structure having
A vehicle body structure characterized in that a weakened portion having a lower strength than that of other floor frame portions is formed at a position near the front edge of the floor panel of the floor frame.   The vehicle body structure according to claim 1, wherein the floor panel is provided with a reinforcing member having one end near the fragile portion and extending from the one end toward the periphery.   The vehicle body structure according to claim 2, wherein the other end portion of the reinforcing member extends to the vicinity of the side sill or is connected to the side sill.   The vehicle body structure according to claim 2, wherein the other end portion of the reinforcing member extends to the vicinity of the tunnel portion or is connected to the tunnel portion. The vehicle has a torque box extending in the vehicle width direction at the front edge of the floor panel,
The vehicle body structure according to claim 1, wherein the other end portion of the reinforcing member extends to the vicinity of the torque box or is connected to the torque box. The vehicle has a cross member extending in the vehicle width direction at the front edge of the floor panel,
The vehicle body structure according to claim 2, wherein the other end portion of the reinforcing member extends to the vicinity of the cross member or is connected to the cross member.   The vehicle body structure according to any one of claims 1 to 6, wherein the reinforcing member is a member extending substantially linearly, and extends obliquely with respect to a vehicle longitudinal direction in which the floor frame extends.   The reinforcing members are respectively provided on both sides of the floor frame in the vehicle width direction, and both of them are members that extend substantially linearly, and these reinforcing members extend obliquely with respect to the vehicle body longitudinal direction in which the floor frame extends. The vehicle body structure according to any one of claims 1 to 7, wherein the vehicle body structure is provided in a V shape in plan view.   The vehicle body structure according to claim 7 or 8, wherein the reinforcing member extends at an angle of approximately 45 degrees with respect to a vehicle longitudinal direction in which the floor frame extends.   The vehicle body structure according to any one of claims 1 to 9, wherein the fragile portion is formed of a tailored blank.   11. The vehicle body structure according to claim 1, wherein the weakened portion is formed of a material having the same thickness as that of the other floor frame and a material different from that of the other floor frame.   The vehicle body structure according to any one of claims 1 to 11, wherein a front end portion of the floor frame is connected to a rear end portion of the front side frame.

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