JP2015110386A - Vehicle body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body structure which effectively utilizes an upper tunnel member and a lower tunnel member of a floor tunnel part to efficiently transmit a large load input from a fore and aft direction of a vehicle body to another portion on the vehicle body.SOLUTION: A front part side partition wall part 5 has a structure including a first dashboard cross member 18 extending along a vehicle width direction and a second dashboard cross member 19 extending along the vehicle width direction below the first dashboard cross member 18. A front end part of the upper tunnel member 20U is fixed to the first dashboard cross member 18 and a front end part of the lower tunnel member 20L is fixed to the second dashboard cross member 19.

Description

  The present invention relates to a vehicle body structure having a floor tunnel portion at the center in the vehicle width direction below a passenger compartment.

  As a vehicle body structure, a floor tunnel portion provided at the center in the vehicle width direction below the passenger compartment is fixed to the floor portion of the passenger compartment, an upper tunnel member fixed to the upper portion of the lower tunnel portion, (For example, refer to Patent Document 1).

  The vehicle body structure described in Patent Document 1 has a two-layer structure in which the floor tunnel portion is composed of a lower tunnel member and an upper tunnel member, and a closed cross section that is continuous in the vehicle longitudinal direction is formed between the lower tunnel member and the upper tunnel member. Has been. The front end portion of the upper tunnel member is provided with a partition wall that separates the passenger compartment and the vehicle front chamber such as an engine room, and is disposed above the dashboard cross member (vehicle width direction reinforcing member) that constitutes the partition wall. The front end of the tunnel member is fixed. In addition, an extension portion extending outward in the vehicle width direction is provided in the front end region of the left and right side walls of the upper tunnel member, and the distal end portion of the extension portion is connected to the base portions of the left and right front pillars. Yes. The left and right extending portions serve as sub-frame mounting portions that support the power unit in the vehicle front compartment.

Japanese Patent No. 4123024

  In the conventional vehicle body structure, since the floor tunnel portion disposed at the center of the floor portion is composed of the lower tunnel member and the upper tunnel member, the rigidity at the lower center of the passenger compartment is enhanced by the floor tunnel portion. However, since the front end portion of the floor tunnel portion is fixed to the dashboard cross member only by the upper tunnel member, for example, when a large impact load is input to the dashboard cross member from the front side of the vehicle, the dashboard cross member The impact load input to is directly input only to the upper tunnel member. For this reason, the lower tunnel member does not easily contribute to load transmission in the front-rear direction.

  Accordingly, the present invention provides a vehicle body structure that can efficiently transmit a large load input from the front-rear direction of the vehicle body to other parts of the vehicle body by effectively utilizing the upper tunnel member and the lower tunnel member of the floor tunnel portion. Is to provide.

The vehicle body structure according to the present invention employs the following configuration in order to solve the above problems.
The invention according to claim 1 includes a passenger compartment (for example, the passenger compartment 2 of the embodiment) in which an occupant is boarded, and a vehicle front chamber (for example, the vehicle front chamber 3 of the embodiment) provided at the front of the passenger compartment. A front-side partition wall (for example, the front-side partition wall 5 of the embodiment) disposed between the passenger compartment and the vehicle front chamber, and a vehicle body longitudinal direction at the center in the vehicle width direction below the passenger compartment And a first tunnel cross member (for example, the floor tunnel portion 9 of the embodiment) extending along the vehicle width direction, the front-side partition wall portion extending along the vehicle width direction. For example, the first dashboard cross member 18 according to the embodiment and the second dashboard cross member extending along the vehicle width direction below the first dashboard cross member (for example, the second dashboard according to the embodiment). Cross member 19) The floor tunnel portion extends along the longitudinal direction of the vehicle body, and extends along the longitudinal direction of the vehicle body, and a lower tunnel member (for example, the lower tunnel member 20L of the embodiment) fixed to the floor portion of the passenger compartment. An upper tunnel member (for example, the upper tunnel member 20U of the embodiment) fixed to an upper portion of the lower tunnel member, and a front end portion of the upper tunnel member is fixed to the first dashboard cross member. The front end portion of the lower tunnel member is fixed to the second dashboard cross member.
Thereby, for example, when a large impact load is input from the front side of the vehicle, the impact load is input to the first dashboard cross member and the second dashboard cross member, and input to the first dashboard cross member. The load input to the upper tunnel member and the load input to the second dashboard cross member are input to the lower tunnel member, respectively. Therefore, the load input to the vehicle is distributed to the upper tunnel member and the lower tunnel member and transmitted to the rear side of the vehicle body.
In particular, in the case of an offset collision from the front, a large load input through one of the left and right front side frames at the front of the vehicle is distributed to the first dashboard cross member and the second dashboard cross member. Is input. For this reason, the first dashboard cross member and the second dashboard cross member receive the load efficiently, and the load is efficiently distributed to the floor tunnel portion and the opposite side in the vehicle width direction so that the load is spread over a wide area of the vehicle. Can be absorbed.

According to a second aspect of the present invention, in the vehicle body structure according to the first aspect, the first dashboard cross member is a first cross member main body portion having a substantially U-shaped cross section that opens to the rear side of the vehicle body (for example, in the embodiment). A first cross member main body portion 21) and a first reinforcing member (for example, the mounting bracket 22 of the embodiment) fixed in a substantially U-shaped cross section of the first cross member main body portion, The front end portion of the tunnel member is fixed to the first reinforcing member.
As a result, the front end portion of the upper tunnel member is fixed to the first reinforcing member in the substantially U-shaped cross section of the first cross member main body, so that the cross section of the first cross member main body is reinforced by the first reinforcing member. In addition, the upper tunnel member is rigidly coupled to the first dashboard cross member in a wide range in the vertical direction. For this reason, it becomes possible to transmit a load more efficiently between the first dashboard cross member and the front end portion of the upper tunnel member.

According to a third aspect of the present invention, in the vehicle body structure according to the first or second aspect, the second dashboard cross member is a second cross member main body portion having a substantially U-shaped cross section that opens to the rear side of the vehicle body (for example, implementation). A second cross member main body portion 23) and a second reinforcing member (for example, the mounting bracket 24 of the embodiment) fixed in a substantially U-shaped cross section of the second cross member main body portion, The front end portion of the lower tunnel member is fixed to the second reinforcing member.
As a result, the front end portion of the lower tunnel member is fixed to the second reinforcing member in the substantially U-shaped cross section of the second cross member main body, so that the cross section of the second cross member main body is reinforced by the second reinforcing member. In addition, the lower tunnel member is rigidly coupled to the second dashboard cross member in a wide range in the vertical direction. For this reason, it becomes possible to transmit a load more efficiently between a 2nd dashboard cross member and the front-end part of a lower tunnel member.

The invention according to claim 4 is the vehicle body structure according to any one of claims 1 to 3, wherein a pair of side frames (e.g., extending along the vehicle longitudinal direction on both sides in the vehicle width direction of the vehicle front chamber) The front side frame 10) of the embodiment is provided, and both end portions of the first dashboard cross member and the second dashboard cross member are respectively connected to the pair of side frames. .
Thereby, the load input to the side frame of the vehicle front chamber is distributed and transmitted to the first dashboard cross member and the second dashboard cross member. For this reason, the load input to the side frame can be efficiently distributed to the upper tunnel member and the lower tunnel member.

According to a fifth aspect of the present invention, in the vehicle body structure according to the fourth aspect, a pair of side sills (for example, the side sill 7 of the embodiment) extending along the vehicle longitudinal direction on both sides in the vehicle width direction of the passenger compartment, A pair of outriggers (for example, the outriggers 11 of the embodiment) that extend outward in the vehicle width direction from the side frames and are connected to the corresponding left and right side sills, respectively, and the outriggers on the side frames Are connected to a front-rear direction region extending over a connection portion with the first dashboard cross member and a connection portion with the second dashboard cross member.
Thereby, the load input to the side frame of the vehicle front chamber is transmitted to the first dashboard cross member and the second dashboard cross member, and further transmitted from these to the upper tunnel member and the lower tunnel member, It is also transmitted to the left and right side sills via the left and right outriggers. Therefore, the load input to the side frame can be distributed to more skeleton members.

According to a sixth aspect of the present invention, in the vehicle body structure according to any one of the first to fifth aspects, a vehicle rear chamber (for example, the engine room 4 of the embodiment) provided in a rear portion of the passenger compartment, and the passenger compartment And a rear-side partition wall (for example, the rear-side partition wall 6 of the embodiment) disposed between the vehicle rear chamber, and the rear-side partition wall extends along the vehicle width direction. A member (for example, the bulkhead cross member 15 of the embodiment), at least the upper wall of the lower tunnel member is inclined upward from the front to the rear, and the rear ends of the upper tunnel member and the lower tunnel member are The bulkhead cross member is connected to the bulkhead cross member.
As a result, the impact load input to the first dashboard cross member and the second dashboard cross member from the longitudinal direction of the vehicle body is transmitted to the rear bulkhead cross member via the upper tunnel member and the lower tunnel member of the floor tunnel portion. Is done. Further, when an impact load is input from the vehicle width direction in the front region of the floor tunnel portion, the impact load includes the first dashboard cross member and the second dashboard cross member, and the upper tunnel member. It is received by the bulkhead cross member connected via the lower tunnel member. Even when it is necessary to reduce the height of the passenger compartment floor and the first and second dashboard cross members due to the vehicle body design, the rear bulkhead cross member can efficiently receive the impact load from the side. Is possible.

The invention according to claim 7 is the vehicle body structure according to any one of claims 1 to 6, wherein the first dashboard cross member is a central member to which a front end portion of the upper tunnel member is fixed (for example, implementation) A central member 18C) of the form and a pair of side members (for example, the side member 18S of the embodiment) respectively connected to both ends of the central member, and the second dashboard cross member includes: A central member (for example, the central member 19C of the embodiment) to which the front end portion of the lower tunnel member is fixed, and a pair of side members (for example, the side member of the embodiment) respectively connected to both ends of the central member 19S).
Thereby, at the time of vehicle body assembly, the first dashboard cross member and the second dashboard cross member are divided into the central member and the side member, respectively, and only the central members are the front end portions of the upper tunnel member and the lower tunnel member. The assembly of the central member and the floor tunnel portion can be easily assembled later on the side member assembled in advance in another place and assembled on the vehicle body side.

  According to this invention, the front end of the upper tunnel member is fixed to the first dashboard cross member, and the front end of the lower tunnel member is fixed to the second dashboard cross member. Large load can be distributed to the upper and lower tunnel members of the floor tunnel portion and efficiently transmitted to other parts of the vehicle body.

1 is a schematic longitudinal sectional view of a vehicle according to an embodiment of the present invention cut along a longitudinal direction of a vehicle body. It is a bottom view from the front part of the vehicle of one Embodiment of this invention to the center area | region. It is the perspective view which looked at the frame part of the rear part of vehicles of one embodiment of this invention from the back side. It is the perspective view which looked at the front part of the vehicle of one Embodiment of this invention from diagonally upward rear of a passenger compartment. It is the perspective view which looked at the frame of the front part of the vehicle of one embodiment of this invention from the back side. It is the perspective view which looked at the frame part of the front part of the vehicle of one embodiment of this invention from diagonally upper back. It is the perspective view which looked at the front part of the vehicle of one Embodiment of this invention from the diagonally upper back of the passenger compartment, removing a part member. It is the perspective view which looked at the front part of the vehicle of one Embodiment of this invention from the diagonally upper back of the passenger compartment, removing a part member. It is the perspective view which looked at the rear part of the vehicle of one embodiment of this invention from the diagonally upper front of the passenger compartment with some members removed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow LH indicates the left side of the vehicle.

FIG. 1 is a view of a vehicle 1 according to this embodiment cut along the longitudinal direction of the vehicle body at the approximate center in the vehicle width direction and viewed from the left side. FIG. 2 shows the skeleton of the vehicle 1 from the back side. FIG. FIG. 3 is a view of the skeleton portion at the rear of the vehicle body of the vehicle 1 as seen from the back side.
The vehicle 1 of this embodiment is a rear wheel drive vehicle in which an engine is mounted on the rear part of the vehicle body and the rear wheels are driven by the engine. A vehicle front chamber 3 in which a front suspension device and the like are accommodated is disposed in front of the passenger compartment 2 of the vehicle 1, and an engine room 4 that is a vehicle rear chamber is disposed behind the passenger compartment 2. . The passenger compartment 2 and the vehicle front compartment 3 are partitioned by a front partition wall portion 5, and the passenger compartment 2 and the engine room 4 are partitioned by a rear partition wall portion 6. Side sills 7, which are skeleton members along the longitudinal direction of the vehicle body, are arranged below the left and right sides of the passenger compartment 2. The left and right side sills 7 are connected to each other by a plurality of cross members such as a floor cross member 14 in the center region in the longitudinal direction of the vehicle body. In addition, left and right floor panels 8 forming the floor of the passenger compartment 2 are laid between the left and right side sills 7, and between the left and right floor panels 8, along the vehicle body longitudinal direction below the passenger compartment 2. An extended floor tunnel portion 9 is arranged.

  A pair of left and right front side frames 10 (side frames) extending toward the front side of the vehicle body (extending along the longitudinal direction of the vehicle body) are disposed on the left and right sides of the front side of the passenger compartment 2. The left and right front side frames 10 extend forward of the vehicle body from the inner side in the vehicle width direction than the left and right side sills 7. One end of an outrigger 11 extending outward in the vehicle width direction is joined to the rear edge of each of the left and right front side frames 10. The other end of the outrigger 11 is joined to the front edge of the corresponding side sill 7 on the left and right. Further, the rear end portions of the left and right front side frames 10 are connected to the left and right front floor frames 13 below the passenger compartment 2 with a dashboard panel 12 described later interposed therebetween. The left and right front floor frames 13 extend along the longitudinal direction of the vehicle body, and the rear ends are joined to the floor cross member 14. The front floor frame 13 is configured by joining upper and lower panels that form a substantially U-shaped cross section with the floor panel 8 interposed therebetween.

  A pair of left and right rear side frames 17 extending toward the rear side of the vehicle body are joined to the vehicle width direction inner side portions of the rear edges of the left and right side sills 7. A bulkhead cross member 15 extending in the vehicle width direction is disposed between the front edge portions of the left and right rear side frames 17, and the left and right rear side frames 17 are connected to each other by the bulkhead cross member 15. Yes. A bulkhead panel 16 rising upward from the rear end of the floor panel 8 is joined to the front surface of the bulkhead cross member 15. In this embodiment, the bulkhead cross member 15 and the bulkhead panel 16 constitute the rear partition wall 6.

FIG. 4 is a view of the front lower portion of the passenger compartment 2 of the vehicle 1 as viewed from the passenger compartment 2 side. Further, FIG. 5 is a view of the front lower part of the passenger compartment 2 as viewed from the rear side with the dashboard panel 12 and the floor panel 8 removed, and FIG. 6 is a front view of the passenger compartment 2 below the dashboard. It is the figure which removed the panel 12 and the floor panel 8, and was seen from the upper side.
The left and right front side frames 10 are curved upward from a joint portion with the front floor frame 13 on the rear side, and extend substantially horizontally from the front end side of the curved portion to the vehicle front side. A first dashboard cross member 18 and a second dashboard cross member 19 extending along the vehicle width direction are coupled to the rear edge portions of the left and right front side frames 10. Both ends of the first dashboard cross member 18 are joined to the inner side surfaces of the left and right front side frames 10, and the second dashboard cross member 19 has both ends connected to the first dashboard cross member 18. At the lower rear position than 18, it is joined to the lower surfaces of the left and right front side frames 10 and the inner side surface in the vehicle width direction. A dashboard panel 12 is joined to the rear surfaces (surfaces facing the rear side of the vehicle body) of the first dashboard cross member 18 and the second dashboard cross member 19.
In this embodiment, the first dashboard cross member 18 and the second dashboard cross member 19 together with the dashboard panel 12 constitute the front partition wall 5. In addition, the left and right outriggers 11 described above are arranged in a front-rear direction region straddling the joint portion between the first dashboard cross member 18 and the joint portion with the second dashboard cross member 19 in the corresponding left and right front side frames 10. It is joined.

  In addition, the floor tunnel portion 9 has a hat-shaped cross-sectional shape that opens downward and extends in the vehicle front-rear direction, and the left and right opening edges are joined to the inner edges of the left and right floor panels 8 in the vehicle width direction Upper tunnel in which tunnel member 20L and a substantially U-shaped cross-sectional shape that opens downward extend along the longitudinal direction of the vehicle body, and left and right opening edges are joined along side edges on the upper end side of lower tunnel member 20L And a member 20U. The upper tunnel member 20U and the lower tunnel member 20L are joined to each other, thereby forming a substantially rectangular closed cross section along the longitudinal direction of the vehicle body between them.

  The front end portions of the upper tunnel member 20U and the lower tunnel member 20L protrude to the rear surfaces (surfaces facing the rear side of the vehicle body) of the first dashboard cross member 18 and the second dashboard cross member 19 with the dashboard panel 12 interposed therebetween. The rear panel is joined to the rear panel with the dashboard panel 12 interposed therebetween. Further, the rear end portions of the upper tunnel member 20U and the lower tunnel member 20L are abutted against the front surface (surface facing the front side of the vehicle body) of the bulkhead cross member 15 and joined to the front surfaces thereof. In addition, each joining form before and behind the upper tunnel member 20U and the lower tunnel member 20L will be described in detail later.

FIG. 7 is a view showing a joint portion on the front end side of the first dashboard cross member 18 with the upper tunnel member 20U. In FIG. 7, the dashboard panel 12 is omitted for convenience of illustration.
The first dashboard cross member 18 includes a first cross member main body 21 having a substantially U-shaped cross section that opens toward the rear side of the vehicle body, and a substantially U-shaped central region of the first cross member main body 21 in the vehicle width direction. A pair of mounting brackets 22 (first reinforcing members) fixed in the cross section. The first cross member main body portion 21 is provided with flange portions 21a at upper and lower opening edges of a substantially U-shaped cross section, and the dashboard panel 12 is joined to a surface of the flange portion 21a facing the vehicle body rear side. It has become. The mounting bracket 22 includes a support wall 22a that hangs from a joint portion joined to the inner bottom surface of the first cross member main body portion 21 toward the opening side of the first cross member main body portion 21, and an upper end of the support wall 22a. And a flange portion 22b bent outward in the vehicle width direction, and the dashboard panel 12 is joined to a surface of the flange portion 22b facing the vehicle body rear side.

Here, as shown in FIGS. 4 and 6, a joining flange 20 </ b> Ua is integrally formed at the front end portion of the upper tunnel member 20 </ b> U. The front end portion of the upper tunnel member 20U is joined to the flange portions 21a and 22b of the first cross member main body portion 21 and the mounting bracket 22 with the joining flange 20Ua portion sandwiching the dashboard panel 12 therebetween.
In this embodiment, the first cross member main body 21 has a panel material arranged at the center in the vehicle width direction and another panel material joined to both sides of the panel material in the vehicle width direction by bolt fastening or the like. It has come to be. The mounting bracket 22 is welded and fixed to the panel member in the center in the vehicle width direction in advance, and both edges of the center panel member are joined to the panel members on both sides in the vehicle width direction at the time of final assembly. In this embodiment, the panel material at the center in the vehicle width direction and the mounting bracket 22 constitute the central member 18C, and the panel materials on both sides in the vehicle width direction constitute the side member 18S.
Further, a lower end flange portion 21 b that protrudes toward the rear side of the vehicle body is provided at the lower end of the center of the first cross member main body portion 21 in the vehicle width direction. The lower end flange portion 21b protrudes rearward of the vehicle body from substantially the same height as the upper wall constituting the top surface of the lower tunnel member 20L, and the upper surface of the protruding portion is the front end portion of the upper wall of the lower tunnel member 20L. It is joined to the bottom surface. For this reason, for example, when a load is input to the first dashboard cross member 18 from the front, the load is also transmitted to the lower tunnel member 20L via the lower end flange portion 21b.

FIG. 8 is a view showing a joint portion on the front end side of the second dashboard cross member 19 with the lower tunnel member 20L. In FIG. 8, the dashboard panel 12 is omitted for the sake of illustration.
The second dashboard cross member 19 includes a second cross member main body 23 having a substantially U-shaped cross section that opens toward the rear side of the vehicle body, and a substantially U-shaped central region of the second cross member main body 23 in the vehicle width direction. And a pair of mounting brackets 24 (second reinforcing members) fixed in the cross section. The second cross member main body portion 23 is provided with flange portions 23a at upper and lower opening edges of a substantially U-shaped cross section, and the dashboard panel 12 is joined to a surface of the flange portion 23a facing the vehicle body rear side. It has become. The mounting bracket 24 includes a support wall 24a that hangs from a joint portion joined to the inner bottom surface of the second cross member main body portion 23 toward the opening side of the second cross member main body portion 23, and a vehicle from the upper end of the support wall 24a. A flange portion 24b that is bent inward in the width direction, and the dashboard panel 12 is joined to a surface of the flange portion 24b facing the vehicle body rear side.

As shown in FIGS. 4, 6, and 7, a joining flange 20La is integrally formed at the front end of the lower tunnel member 20L. At the front end portion of the lower tunnel member 20L, the joining flange 20La portion is joined to the second cross member main body portion 23 and the flange portions 23a and 24b of the mounting bracket 24 with the dashboard panel 12 interposed therebetween.
In this embodiment, the second cross member main body 23 has a panel member arranged at the center in the vehicle width direction and another panel member joined to both sides of the panel member in the vehicle width direction by bolt fastening or the like. It is like that. The mounting bracket 24 is fixed to the panel member in the center in the vehicle width direction in advance by welding, and both edges of the center panel member are joined to the panel members on both sides in the vehicle width direction at the time of final assembly. The panel member at the center in the vehicle width direction and the mounting bracket 24 constitute a center member 19C of the second dashboard cross member 19, and the panel members on both sides in the vehicle width direction include the side members 19S of the second dashboard cross member 19. It is composed.

FIG. 9 is a view showing a connecting portion on the rear end side of the upper tunnel member 20U and the lower tunnel member 20L of the bulkhead cross member 15. In FIG. 9, the bulkhead panel 16 is omitted for convenience of illustration.
The lower surface of the bulkhead cross member 15 has a shape in which left and right edges are inclined so that a central region in the vehicle width direction is recessed upward. The rear end portions of the upper tunnel member 20U and the lower tunnel member 20L are joined to the central region in the vehicle width direction of the bulkhead cross member 15 having the lowest lower surface height. The bulkhead cross member 15 includes a member body portion 25 having a substantially U-shaped cross section that opens toward the front side of the vehicle body, and a pair of members fixed in a substantially U-shaped cross section in the center region in the vehicle width direction of the member main body portion 25. Mounting bracket 26. The member main body 25 is provided with flange portions 25a at upper and lower opening edges of a substantially U-shaped cross section. The mounting bracket 26 has a pair of support walls 26a joined to the inner bottom surface of the member main body 25 and a joint wall 26b connecting the extended ends of the pair of support walls 26a.
Further, a lower end flange portion 15 a that protrudes toward the front side of the vehicle body is provided at the lower end of the bulkhead cross member 15 in the center in the vehicle width direction. The lower end flange portion 15a protrudes forward of the vehicle body from substantially the same height as the rear end portion of the upper wall constituting the top surface of the lower tunnel member 20L, and the upper surface of the protruding portion is the upper wall of the lower tunnel member 20L. It is joined to the lower surface of the rear end portion.

  Here, the upper tunnel member 20U and the lower tunnel member 20L of the floor tunnel portion 9 have their upper surfaces inclined upward from the front to the rear, and the rear end side is higher than the front end side. Joining flanges 20Lb and 20Ub are provided at the rear end portion of the lower tunnel member 20L and the rear end portion of the upper tunnel member 20U, respectively. The upper end portion of the joining flange 20Lb of the lower tunnel member 20L is joined to the lower flange portion 25a of the member main body portion 25 with the bulkhead panel 16 in between. Further, the joining flange 20Ub of the upper tunnel member 20U is joined to the joining wall 26b of the mounting bracket 26 and the upper flange portion 25a of the member main body 25 with the bulkhead panel 16 interposed therebetween.

  In the vehicle body structure of the vehicle 1 according to this embodiment, the first dashboard cross member 18 and the second dashboard cross member 19 are provided in the front partition wall 5 in front of the passenger compartment 2 so as to be lined up and down. Since the front end portion of the upper tunnel member 20U of the tunnel portion 9 and the front end portion of the lower tunnel member 20L are coupled to the first dashboard cross member 18 and the second dashboard cross member 19, for example, the front side of the vehicle When a large impact load is input, the impact load is distributed to the upper tunnel member 20U and the lower tunnel member 20L via the first dashboard cross member 18 and the second dashboard cross member 19 and transmitted to the rear side of the vehicle body. Will come to be. Therefore, by adopting this vehicle body structure, the input impact load can be distributed to the upper tunnel member 20U and the lower tunnel member 20L, and the impact load can be efficiently absorbed by these tunnel members 20U and 20L.

  Further, when the vehicle has an offset collision from the front, the impact load input to one of the left and right front side frames 10 is distributed and transmitted to the first dash cross member 18 and the second dash cross member 19. become. For this reason, even if one of the left and right front side frames 10 receives a large impact load, the load is transferred to the floor tunnel portion 9 via the first and second dashboard cross members 18 and 19 and on the opposite side in the vehicle width direction. Can be transmitted efficiently. Therefore, even during an offset collision of the vehicle, the impact load can be efficiently absorbed in a wide area of the vehicle.

Further, in the vehicle body structure of this embodiment, the first dashboard cross member 18 is fixed within the first cross member main body 21 having a substantially U-shaped cross section and the substantially U-shaped cross section of the first cross member main body 21. Mounting bracket 22, and the front end portion of the upper tunnel member 20U is joined to the mounting bracket 22. Therefore, the cross section of the first cross member main body portion 21 is reinforced by the mounting bracket 22, and the first cross member main body is reinforced. The rigidity of the portion 21 can be increased, and the front end portion of the upper tunnel member 20U can be rigidly coupled to the first dashboard cross member 18 in a wide vertical range. Therefore, the load transmission efficiency between the 1st dashboard cross member 18 and the front-end part of the upper tunnel member 20U can be improved.
In particular, in the case of this embodiment, since the front end portion of the upper tunnel member 20U is coupled not only to the mounting bracket 22 but also to the flange portion 21a of the first cross member main body portion 21, the first dashboard cross member 18, the joining region of the front end portion of the upper tunnel member 20 </ b> U can be made wider, and the joining portion rigidity can be further increased.

Furthermore, in the vehicle body structure of this embodiment, the second dashboard cross member 19 is fixed to the second cross member main body portion 23 having a substantially U-shaped cross section and the cross section of the second cross member main body portion 23. Bracket 24, and the front end portion of the lower tunnel member 20L is joined to the mounting bracket 24, so that the cross section of the second cross member main body portion 23 is reinforced by the mounting bracket 24 and the second cross member main body portion 23 In addition to increasing the rigidity, the front end portion of the lower tunnel member 20L can be rigidly coupled to the second dashboard cross member 19 in a wide vertical range. Thereby, the load transmission efficiency between the 2nd dashboard cross member 19 and the front-end part of the lower tunnel member 20L can be improved.
In the case of this embodiment, the front end portion of the lower tunnel member 20L is coupled not only to the mounting bracket 24 but also to the flange portion 23a of the second cross member main body portion 23. The joint region at the front end of the lower tunnel member 20L can be made wider to further increase the joint rigidity.

  Further, in the vehicle body structure of this embodiment, both end portions of the first dashboard cross member 18 and the second dashboard cross member 19 are connected to the left and right front side frames 10, respectively. The impact load input to the front side frame 10 can be efficiently distributed and transmitted to the first dashboard cross member 18 and the second dashboard cross member 19. Therefore, with this structure, the input load can be efficiently distributed to the upper tunnel member 20U and the lower tunnel member 20L.

  Further, in the vehicle body structure of this embodiment, the outrigger 11 that connects the left and right front side frames 10 and the side sills 7 is connected to the first dashboard cross member 18 on the front side frame 10 and the second dashboard cross. Since it is connected to the front-rear direction region straddling the connecting portion with the member 19, the impact load input from the front of the vehicle body to the left and right front side frames 10 is applied to the first and second dashboard cross members 18, 19. Via the upper tunnel member 20U and the lower tunnel member 20L, and can be efficiently dispersed and transmitted to the left and right side sills 7 as well. For this reason, the impact load input to the front side frame 10 from the front side can be distributed to many skeleton members, and the load can be absorbed efficiently.

  Further, in the vehicle body structure of this embodiment, the upper tunnel member 20U and the lower tunnel member 20L extend so that the respective upper walls are inclined upward from the front toward the rear, and the respective rear end portions are on the rear side. Since it is coupled to the bulkhead cross member 15 of the partition wall portion 6, the impact load transmitted from the front side of the vehicle body to the upper tunnel member 20U and the lower tunnel member 20L is received by the bulkhead cross member 15 behind the passenger compartment 2. Can do. For this reason, the input impact load can be efficiently absorbed by the floor tunnel portion 9 or the like.

Further, in the case of this vehicle body structure, when an impact load is input from the vehicle width direction in the front region of the floor tunnel portion 9, the impact load is not limited to the first and second dashboard cross members 18 and 19. The bulkhead cross member 15 connected to these via the upper tunnel member 20U and the lower tunnel member 20L can also be received. For this reason, when the height of the floor panel 8 and the first and second dashboard cross members 18 and 19 in the passenger compartment 2 is reduced in order to make the shape of the car body, for example, in the vehicle body design, The bulkhead cross member 15 can efficiently receive an impact load from the side of the vehicle body.
In this embodiment, the upper walls of both the upper tunnel member 20U and the lower tunnel member 20L are inclined upward from the front to the rear, but only the upper wall of the lower tunnel member 20L is from the front to the rear. You may make it incline upwards.

  Further, in the vehicle body structure of this embodiment, the first dashboard cross member 18 includes a central member 18C fixed to the front end portion of the upper tunnel member 20U, and left and right fixed to the front side frame 10 and the outrigger 11. A central member 19C fixed to the front end portion of the lower tunnel member 20L, and left and right side portions fixed to the front side frame 10 and the outrigger 11 Therefore, only the central members 18C and 19C of the first and second dashboard cross members 18 and 19 are assembled in advance at the front end portions of the upper tunnel member 20U and the lower tunnel member 20L in advance at different locations. Can do. Therefore, it is possible to efficiently assemble the assembly of the center members 18C and 19C and the floor tunnel portion 9 with respect to the side members 18S and 19S of the first and second dashboard cross members 18 and 19 fixed to the vehicle body side. it can. Therefore, by adopting this structure, the assembly efficiency of the vehicle body can be improved.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

2 ... Passenger room 3 ... Vehicle front room 4 ... Engine room (vehicle rear room)
5 ... Front side partition wall portion 6 ... Rear side partition wall portion 7 ... Side sill 9 ... Floor tunnel portion 10 ... Front side frame (side frame)
11 ... Outrigger 15 ... Bulkhead cross member 18 ... First dashboard cross member 18C ... Central member 18S ... Side member 19 ... Second dashboard cross member 19C ... Central member 19S ... Side member 20U ... Upper tunnel member 20L ... Lower tunnel member 21... First cross member main body 22... Mounting bracket (first reinforcing member)
23 ... 2nd cross member main-body part 24 ... Mounting bracket (2nd reinforcement member)

Claims (7)

A passenger compartment where passengers board,
A vehicle front chamber provided at the front of the passenger compartment;
A front-side partition disposed between the passenger compartment and the vehicle front chamber;
In the center of the vehicle width direction below the passenger compartment, a floor tunnel portion extending along the longitudinal direction of the vehicle body, and
A first dashboard cross member that extends along the vehicle width direction, and a second dashboard cross member that extends along the vehicle width direction below the first dashboard cross member. And having
A lower tunnel member that extends along the vehicle body longitudinal direction and is fixed to the floor portion of the passenger compartment, and an upper tunnel member that extends along the vehicle body longitudinal direction and is fixed to the upper portion of the lower tunnel member. And having
A vehicle body structure, wherein a front end portion of the upper tunnel member is fixed to the first dashboard cross member, and a front end portion of the lower tunnel member is fixed to the second dashboard cross member. The first dashboard cross member includes a first cross member main body portion having a substantially U-shaped cross section that opens to the rear side of the vehicle body, and a first reinforcement fixed in the substantially U-shaped cross section of the first cross member main body portion. A member, and
The vehicle body structure according to claim 1, wherein a front end portion of the upper tunnel member is fixed to the first reinforcing member. The second dashboard cross member includes a second cross member main body portion having a substantially U-shaped cross section that opens to the rear side of the vehicle body, and a second reinforcement fixed in the substantially U-shaped cross section of the second cross member main body portion. A member, and
The vehicle body structure according to claim 1 or 2, wherein a front end portion of the lower tunnel member is fixed to the second reinforcing member. A pair of side frames extending along the longitudinal direction of the vehicle body are provided on both sides of the vehicle front chamber in the vehicle width direction,
The vehicle body structure according to any one of claims 1 to 3, wherein both end portions of the first dashboard cross member and the second dashboard cross member are connected to a pair of the side frames, respectively. . A pair of side sills extending along the vehicle longitudinal direction on both sides in the vehicle width direction of the passenger compartment;
A pair of outriggers extending outward in the vehicle width direction from the pair of side frames and respectively connected to the corresponding left and right side sills,
The said outrigger is connected to the front-back direction area | region straddling the connection part with the said 1st dashboard cross member and the connection part with the said 2nd dashboard cross member on the said side frame. Item 5. The vehicle body structure according to Item 4. A vehicle rear chamber provided at the rear of the passenger compartment;
A rear partition wall disposed between the passenger compartment and the vehicle rear compartment,
The rear side partition wall portion has a bulkhead cross member extending along the vehicle width direction,
The upper wall of at least the lower tunnel member is inclined upward from the front to the rear, and the rear end portions of the upper tunnel member and the lower tunnel member are coupled to the bulkhead cross member. Item 6. The vehicle body structure according to any one of Items 1 to 5. The first dashboard cross member includes a central member to which a front end portion of the upper tunnel member is fixed, and a pair of side members respectively connected to both end portions of the central member.
The second dashboard cross member includes a central member to which a front end portion of the lower tunnel member is fixed, and a pair of side members respectively connected to both end portions of the central member. The vehicle body structure according to any one of claims 1 to 6.

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