JP3166596B2 - Lower body structure of vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower body structure of a vehicle, and more particularly, to a lower body structure of a vehicle having a tunnel formed on a floor of the vehicle.

[0002]

2. Description of the Related Art Conventionally, as an example of a lower vehicle body structure of a vehicle having a tunnel portion formed on a vehicle body floor, Japanese Patent Laid-Open No. 3-126 is disclosed.
No. 779 is known.

As shown in FIG. 5, in the lower vehicle body structure of the vehicle, a member 7 for vertically partitioning a tunnel 70 formed in the vehicle width direction central portion of the vehicle body floor along the vehicle front-rear direction.
2, the strength of the tunnel portion 70 and the strength of the vehicle body in the front-rear direction are increased by forming the closed cross section 74 at the upper portion of the tunnel portion 70. The left and right rockers 76
A floor cross member 78 having both ends coupled to a side sill (also referred to as a side sill) is caused to rise along the tunnel portion 70, and is coupled to the closed cross section 74 at the upper portion of the tunnel portion 70, so that the vehicle can be moved in the vehicle longitudinal direction and the vehicle width direction. The strength of the floor surface 80 is increased.

[0004]

However, in this lower vehicle body structure of the vehicle, the vehicle is moved to only one of the right and left under reinforcements 84 via the right or left front side member 82 by a so-called offset collision. When an impact force equal to or greater than a predetermined value acts from the front, the tunnel portion 70 that easily expands and contracts in the vehicle width direction is interposed, and it is difficult for this impact force to be transmitted across the tunnel portion 70 to the opposite floor surface. Therefore, a large impact force is input only to the floor surface 80 on the side where the underreinforce 84 on which the impact force has acted is disposed.

In consideration of the above fact, the present invention reliably transmits the impact force input to one floor to the other floor via the tunnel under one of the right and left under reinforces so as to prevent the vehicle body from reacting. It is an object to obtain a lower body structure of a vehicle capable of improving power.

[0006]

According to the first aspect of the present invention, there is provided a vehicle having a tunnel portion formed in a vehicle width direction central portion of a vehicle body floor along a vehicle front-rear direction, and a vehicle having the tunnel portion on the vehicle body floor. A pair of left and right underreinforces provided on both sides in the width direction along the vehicle front-rear direction, and a lower body structure of the vehicle, the vehicle being substantially 45 degrees obliquely forward along the vehicle body floor with respect to the underreinforces A load transmitting member for connecting the left and right vehicle body floor portions across the tunnel portion on a line extending to the vehicle.

Therefore, when an impact force acts on one of the left and right underreinforces, the impact force causes the vehicle body floor to be substantially obliquely forward along the vehicle body floor along the underreinforce on which the impact force has acted. A tensile field is formed on a line extending in the 45-degree direction . A load transmission member extending in a direction approximately 45 degrees diagonally forward of the vehicle is provided in a direction along the pulling place, and is input to one floor via a tunnel through an under reinforcement. The applied impact force is reliably transmitted to the other floor via the tunnel portion via the load transmitting member.

According to the present invention, a tunnel formed in the vehicle width direction central portion of the vehicle body floor along the vehicle front-rear direction, and the vehicle front and rear are provided on both sides of the tunnel portion of the vehicle body floor in the vehicle width direction. A pair of left and right under reinforcements provided along the direction, a pair of left and right rockers provided along the vehicle longitudinal direction at both ends in the vehicle width direction of the vehicle body floor portion, and provided along the vehicle width direction on the vehicle body floor portion. And a floor cross member having both ends coupled to the pair of left and right rockers, and a lower body structure of the vehicle,
The intersection of the floor cross member and the under reinforce, and at least one of the left and right vehicle body floor portions across the tunnel portion on a line extending in a direction approximately 45 degrees obliquely forward along the vehicle body portion along the vehicle body floor portion. It is characterized in that a load transmitting member to be connected is provided.

Therefore, when an impact force acts on one of the right and left under reinforcements from the front of the vehicle, the impact force causes the vehicle floor to be inclined approximately 45 degrees obliquely forward with respect to the under reinforcement that has been subjected to the impact force. A pulling station is formed on the extending line. The direction along the pulling area extending from at least one of the rear end of the underreinforce where the pulling area is most susceptible to load and the intersection of the floor cross member and the underreinforce is approximately 45 degrees diagonally forward of the vehicle. A load transmitting member extending in the degree direction is provided. Therefore, the impact force input to one floor across the tunnel via the under reinforcement is transmitted most effectively to the other floor across the tunnel via the load transmitting member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a lower vehicle body structure of a vehicle according to the present invention will be described with reference to FIGS.

In the drawings, arrow FR indicates the forward direction of the vehicle, and arrow UP indicates the upward direction of the vehicle. As shown in FIG. 1, a tunnel portion 12 is provided along a vehicle front-rear direction at a central portion in a vehicle width direction of a floor panel 10 constituting a vehicle body floor portion of the present embodiment.
This tunnel portion 12 is formed by bending the floor panel 10 upward in the shape of a trapezoid.

A pair of right and left rockers 14 are disposed at both ends of the vehicle body floor in the vehicle width direction (the rockers on the left side of the vehicle are not shown) along the vehicle front-rear direction. The parts are each coupled to a rocker 14.

A pair of left and right underreinforces 16 and 18 are disposed substantially in the center of the vehicle body floor between the tunnel portion 12 and the rocker 14 in the vehicle longitudinal direction. The cross-sectional shape of these under reinforcements 16 and 18 viewed from the vehicle front-rear direction is a U-shape with the opening facing upward, and the left and right flanges formed at the opening ends are the left and right flanges of the floor panel 10. Are welded to the lower surfaces of the floor portions 10A and 10B.

At the front end of the floor panel 10, a dash lower panel 20, which separates an engine room and a vehicle compartment and forms a front portion of a vehicle body floor, is provided. A pair of left and right front side members 22 and 24 are connected to a lower surface 20A of the dash lower panel 20, and front end portions 16A and 18A of the under reinforcements 16 and 18 are connected to the front side members 22 and 24. .

The floor panel 10 is provided with a front floor cross member 26 along the vehicle width direction. The cross-sectional shape of the front floor cross member 26 when viewed from the vehicle width direction is a U-shape with the opening directed downward, and front and rear flanges formed at the opening end are formed on the left and right of the floor panel 10. It is welded to the upper surfaces of the floor portions 10A and 10B and the tunnel portion 12. The center floor cross member 2 is located behind the front floor cross member 26.
8 are similarly arranged.

On a line 32 extending from the intersection 30 between the center floor cross member 28 and the right under reinforcement 18 along the vehicle body floor in a direction approximately 45 degrees diagonally forward of the vehicle, the right and left floors straddling the tunnel portion 12. Parts 10A, 10B
A brace 34 is disposed as a load transmitting member for connecting the two.

As shown in FIG. 2, the brace 34 is disposed on the lower surface side of the vehicle body floor, and has both ends 34A, 34B.
Are fixed to the lower surfaces of the left and right floors 10A and 10B.

As shown in FIG. 3, the brace 34 is made of a pipe material, and both ends 34A and 34B are formed by crushing both ends of the pipe material. In addition, brace 3
4 are fixed to the left and right floors 10A and 10B by bolts 36 and nuts 38, respectively.

Next, the operation of the present embodiment will be described. In the present embodiment, when an impact force acts on the underreinforce 18 on the right side of the vehicle from the front of the vehicle via the front side member 24 on the right side of the vehicle, the underreinforce 18 on the right side of the vehicle on which the impact force has acted is directed obliquely forward of the vehicle. A pulling station is formed on the extending line. A straight line 32 extends approximately 45 degrees obliquely forward along the vehicle body floor from the intersection 30 between the center floor cross member 28 and the right under reinforcement 18 where the pulling site is most likely to receive a load. A brace 34 is provided as a load transmitting member that connects the left and right floor portions 10A and 10B across the tunnel portion 12.

Accordingly, the impact force input to the floor 10B on the right side of the vehicle via the under reinforcement 18 on the right side of the vehicle is most effectively applied to the floor 10A on the left side of the vehicle with the tunnel 12 interposed therebetween via the brace 34. Is transmitted. Therefore, the reaction force of the vehicle body can be most effectively improved, and deformation of the vehicle body can be suppressed.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, in the lower body structure of the vehicle of the present embodiment,
Assuming that an impact force acts on the underreinforce 18 on the right side of the vehicle from the front of the vehicle, the vehicle diagonally forwards approximately 45 from the intersection 30 between the center floor cross member 28 and the underreinforce 18 on the right side of the vehicle along the vehicle body floor. A brace 34 as a load transmitting member for connecting the left and right floor portions 10A and 10B across the tunnel portion 12 is disposed on a line 32 extending in the direction of the angle, but the underforce 16 on the left side of the vehicle is subjected to an impact force from the front of the vehicle. Is assumed to act, a line 4 extending from the intersection 40 (see FIG. 1) of the center floor cross member 28 and the under reinforcement 16 on the left side of the vehicle in a direction approximately 45 degrees obliquely forward along the vehicle body floor along the vehicle body floor.
2 (see FIG. 1), a brace as a load transmitting member that connects the left and right floor portions 10A and 10B across the tunnel portion 12 may be provided.

Also, an intersection 30, between the center floor cross member 28 and the left and right under reinforcements 16, 18,
Instead of 40, the front floor cross member 26 and the left and right under reinforcements 16, where the pulling area is most likely to receive a load, like the intersections 30, 40,
At the intersection with 18 or under reinforce 16, 1
8, a brace as a load transmitting member for connecting the left and right floor portions 10A and 10B across the tunnel portion 12 is provided on a straight line extending in a direction approximately 45 degrees obliquely forward of the vehicle along the vehicle body floor portion from the rear end portion. Is also good.

Further, in the lower body structure of the vehicle according to the present embodiment, a pipe material is used for the brace 34 as a load transmitting member, but a square material is used for the brace 34 instead, as shown in FIG. May be. In addition, brace 34
Other members may be used.

[0024]

According to the first aspect of the present invention, there is provided a tunnel formed at the center of the vehicle body floor in the vehicle width direction along the vehicle front-rear direction, and a vehicle on both sides of the tunnel of the vehicle body floor in the vehicle width direction. A lower body structure of the vehicle having a pair of left and right underreinforces provided along the front-rear direction, and substantially diagonally forward of the vehicle along the vehicle body floor with respect to the underreinforces.
Since the load transmitting member connecting the left and right vehicle floors across the tunnel portion is provided on a line extending in the 45-degree direction , the floor portion is sandwiched between the tunnel portions via one of the right and left under reinforcements. Has an excellent effect that the impact force input to the vehicle can be reliably transmitted to the other floor, and the vehicle body reaction force can be improved.

According to a second aspect of the present invention, there is provided a tunnel formed in the vehicle width direction central portion of a vehicle body floor along a vehicle front-rear direction, and a vehicle front-rear direction on both sides of the vehicle body floor tunnel in a vehicle width direction. A pair of left and right under reinforcements provided along the vehicle body, a pair of left and right rockers provided along the vehicle longitudinal direction at both ends in the vehicle width direction of the vehicle body floor, and a pair of left and right rockers provided along the vehicle width direction on the vehicle body floor. A lower body structure of a vehicle having a floor cross member having both ends coupled to a pair of left and right rockers, wherein at least a rear end of an underreinforce and an intersection between the floor cross member and the underreinforce are provided. And approximately 45 from the vehicle diagonally forward along the vehicle body floor
A load transmission member that connects the left and right vehicle floors across the tunnel section on a line extending in the degree direction is provided, so that the tunnel section is sandwiched via one of the left and right underreinforces on one floor section It has an excellent effect that the input impact force can be transmitted most effectively to the other floor and the vehicle body reaction force can be most effectively improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lower vehicle body structure of a vehicle according to an embodiment of the present invention, as viewed obliquely from above and behind a vehicle.

FIG. 2 is a perspective view showing a part of a lower vehicle body structure of the vehicle according to one embodiment of the present invention, as viewed obliquely from the lower rear side of the vehicle.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a perspective view showing a part of a lower vehicle body structure of a vehicle according to another embodiment of the present invention, as viewed obliquely from the lower rear side of the vehicle.

FIG. 5 is a perspective view of a lower vehicle body structure of a vehicle according to a conventional embodiment, as viewed obliquely from above and behind the vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Floor panel 10A Vehicle left floor 10B Vehicle right floor 12 Tunnel part 14 Rocker 16 Vehicle left under reinforcement 18 Vehicle right under reinforcement 26 Front floor cross member 28 Center floor cross member 30 Center floor cross member and vehicle right Intersection with the underreinforce of the vehicle 32 Line extending obliquely forward from the intersection 34 Brace (load transmission member) 40 Intersection between the center floor cross member and the underreinforce on the left side of the vehicle 42 Line extending obliquely forward from the intersection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-227032 (JP, U) JP-A 3-126779 (JP, U) JP-A 63-119486 (JP, U) JP-A 60-120 44874 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (2)

(57) [Claims] 1. A tunnel portion formed in a vehicle width direction central portion of a vehicle body floor along a vehicle front-rear direction, and provided on both sides of the vehicle body width direction of the tunnel portion of the vehicle body floor along a vehicle front-rear direction. A lower body structure of a vehicle having a pair of left and right underreinforces, wherein the left and right vehicle bodies straddle the tunnel portion on a line extending in a direction approximately 45 degrees obliquely forward of the vehicle along the vehicle body floor with respect to the underreinforces. A lower vehicle body structure for a vehicle, comprising a load transmitting member for connecting a floor portion. 2. A tunnel formed in the vehicle width direction central portion of the vehicle body floor along the vehicle front-rear direction, and provided on both sides of the tunnel portion of the vehicle body floor in the vehicle width direction along the vehicle front-rear direction. A pair of left and right under reinforcements, a pair of left and right rockers provided along both sides of the vehicle body in the vehicle width direction, and a pair of left and right rockers provided along the vehicle width direction on the body floor. A floor cross member coupled to the rocker of claim 1, wherein at least one of: a rear end portion of the underreinforce; and an intersection of the floor cross member and the underreinforce. vehicle diagonally forward substantially along the vehicle body floor from
A lower vehicle body structure for a vehicle, wherein a load transmitting member is provided on a line extending in a 45-degree direction to connect the left and right vehicle body floor portions across the tunnel portion.