JP3067485B2 - Underbody 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 vehicle underbody structure provided with an undercover for covering a lower surface of a vehicle body floor.

[0002]

2. Description of the Related Art Conventionally, an underbody structure of a vehicle having an undercover for covering a lower surface of a vehicle body floor is known, and an example thereof is disclosed in Japanese Utility Model Laid-Open No. 59-129676.

As shown in FIG. 6, in this underbody structure of a vehicle, a lower surface 70A of a floor panel 70 of the vehicle body is provided.
An under cover 72 is attached to the side, and the under cover 72 covers the floor panel 70 from below, so that the flow of air passing through the lower part of the vehicle body is smooth and the air resistance is reduced. .

[0004]

However, in this underbody structure of the vehicle, the side wall portion 76A of the tunnel portion 76 formed at the center of the floor panel 70 in the vehicle width direction.
The under cover 72 is supported by a pair of under reinforcements 78 provided in the vicinity of the lower end of the lower cover 80 and the lower flange 80A of the rocker 80. Also, since the under cover 72 is flat, the under cover 7
(2) There is a problem that the surface rigidity of the simple substance is low and it is difficult to handle.

In view of the above, it is an object of the present invention to provide a vehicle underbody structure capable of increasing the surface rigidity of an undercover in a vehicle mounted state and a single body and suppressing vibration of the undercover. It is.

[0006]

According to the present invention, there is provided an underbody structure for a vehicle, comprising: a plurality of under reinforcements arranged in the front-rear direction of the vehicle, which are disposed on a lower surface of the vehicle floor between a tunnel portion of the vehicle floor and a rocker; An undercover for covering the lower surface of the vehicle floor and the lower surface of the rocker, and a reinforcement for the undercover provided at a position of the undercover facing the rocker and the underreinforcement and fixed to the rocker and the underleanment. And, it is characterized by having.

[0007]

In the underbody structure for a vehicle according to the present invention, a plurality of under reinforcements extending in the front-rear direction of the vehicle body are arranged on the lower surface of the vehicle body floor between the tunnel portion of the vehicle body floor and the rocker, and these under reinforcements are arranged. And a plurality of undercover reinforcements provided on the undercover that covers the vehicle body floor are fixed to the vehicle and the rocker. Therefore, the number of locations where the vehicle body floor and the undercover are fixed increases, and the surface rigidity of the undercover alone increases due to the undercover reinforcement. For this reason, the surface rigidity of the undercover in a mounted state of the vehicle body and the undercover alone can be increased, and the vibration of the undercover can be suppressed. Further, the surface rigidity of the undercover alone is increased by the undercover reinforcement, so that the undercover alone can be easily handled.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a vehicle underbody structure according to the present invention will be described with reference to FIGS. In the drawings, the arrow FR indicates the forward direction of the vehicle body, the arrow IN indicates the inner direction of the vehicle width,
Arrow UP indicates the vehicle body upward direction.

As shown in FIG. 5, an under cover 12 is provided at a lower portion of the vehicle body. The under cover 12 has a front under cover 16 which covers a lower portion of an engine room, and an under cover 12 which is provided below a vehicle compartment. It is composed of a center under cover 20 and a rear under cover 24 located below the luggage box.

As shown in FIG. 1, the center undercover 20 is disposed below a center floor pan 26. At the center of the center floor pan 26 in the vehicle width direction, there is formed a tunnel portion 28 bulging upward from the vehicle body, and the tunnel portion 28 extends in the vehicle longitudinal direction. An under reinforcement 30 extending in the front-rear direction of the vehicle body is provided on a lower surface 26A of the center floor pan 26 below the side wall 28A of the tunnel 28. The cross section of the under reinforcement 30 when viewed from the vehicle front-rear direction has a U-shape with the opening directed upward, and the upper end of the inner wall 30A is formed inside the side wall 28A of the tunnel 28. Welded at the bottom. A flange 30C is formed on the upper end portion of the outer wall portion 30B of the under reinforcement 30 toward the outside in the vehicle width direction.
6 is welded to the lower surface 26A. Therefore, the under reinforcement 30 and the center floor pan 26,
It constitutes a closed cross-section structure extending in the vehicle longitudinal direction.

The lower surface 26A of the center floor pan 26
Is provided with an under reinforcement 32 extending in a vehicle front-rear direction at a position away from the under reinforcement 30 by a predetermined distance outward in the vehicle width direction.

As shown in FIG. 2, the cross section of the under reinforcement 32 when viewed from the front and rear direction of the vehicle has a U-shape with an opening directed upward. A flange 32B is formed at the upper end of the inner wall portion 32A of the under reinforcement 32 inward in the vehicle width direction, and the upper end of the outer wall portion 32C of the under reinforcement 32 has a vehicle width direction. Outward flange 3
2D is formed. These flanges 32B, 32
D is welded to the lower surface 26A of the center floor pan 26, respectively. Therefore, the under reinforcement 32 and the center floor pan 26 constitute a closed cross-sectional structure extending in the vehicle longitudinal direction.

In addition, under reinforcement 32
A plurality of mounting holes 33 are formed at predetermined intervals along the vehicle body front-rear direction in the mounting wall portion 32E.
E, the weld nut 3 is coaxial with the through hole 33.
5 is fixed.

As shown in FIG. 3, the center floor pan 2
Rocker 3 extending in the front-rear direction of the vehicle is located on the outside of the vehicle in the vehicle width direction.
4 are provided. The rocker 34 includes a rocker outer 36 that forms an outer portion of the rocker 34 in the vehicle width direction and a rocker inner 38 that forms an inner portion of the rocker 34 in the vehicle width direction, and forms a closed cross-sectional structure 40 extending in the vehicle longitudinal direction. .

At the lower portion of the vertical wall portion 38A of the rocker inner 38, flanges 26B provided upward at both end portions in the vehicle width direction of the center floor pan 26 are welded. A plurality of mounting holes 37 are formed at predetermined intervals along the vehicle front-rear direction in the lower wall portion 36A of the rocker outer 36, and the upper surface of the lower wall portion 36A is coaxial with the through hole 37. A weld nut 39 is fixed.

The outer portion 20A of the center undercover 20 in the vehicle width direction is smoothly curved toward the upper outside of the vehicle body, covers the lower wall portion 36A of the rocker outer 36, and is provided below the vertical wall portion 36B of the rocker outer 36. Has reached. An undercover reinforcement 42 extending in the front-rear direction of the vehicle body is provided at a portion of the center undercover 20 facing the lower wall portion 36A of the rocker outer 36 at an outer portion 20A in the vehicle width direction.

The cross-sectional shape of the undercover reinforcement 42 when viewed from the front-rear direction of the vehicle has a U-shape with the opening directed obliquely outward and downward. At the lower end of the inner wall portion 42A of the undercover reinforcement 42, a flange 42B is provided diagonally inward and downward in the vehicle width direction.
A flange 42D is formed at the lower end of the outer wall 42C of the undercover reinforcement 42 so as to extend diagonally outward and upward in the vehicle width direction. These flanges 42B and 42D are welded to the upper surface 20B of the center undercover 20, respectively.

As shown in FIG. 4, a plurality of through holes 46 are formed in the mounting wall portion 42E of the under cover reinforcement 42 at predetermined intervals along the longitudinal direction of the vehicle body.

As shown in FIG. 3, these through holes 46
Is coaxial with the mounting hole 37, and the inserted bolt 4
By screwing 8 into the weld nut 39, the vehicle width direction outer portion 20 </ b> A of the center undercover 20 can be fixed to the lower wall portion 36 </ b> A of the rocker outer 36.

A work hole 50 for attaching a bolt 48 is formed in a portion of the center under cover 20 facing the through hole 46. The working hole 50 is closed by a lid 52 made of a rubber material, so that water, dust and the like do not enter between the under cover reinforcement 42 and the center under cover 20.

As shown in FIG. 2, an under cover reinforcement 54 extending in the front-rear direction of the vehicle body is provided on the upper surface 20B of the center under cover 20 facing the under reinforcement 32. As shown in FIG.
The cross-sectional shape of the undercover reinforcement 54 when viewed from the vehicle front-rear direction is a U-shape with the opening directed downward. A flange 54B is formed at the lower end of the inner wall 52A of the undercover reinforcement 45 toward the inside in the vehicle width direction, and a lower end of the outer wall 54C of the undercover reinforcement 54 is provided with a vehicle. A flange 54D is formed outward in the width direction. These flanges 54B and 54D are welded to the upper surface 20B of the center undercover 20, respectively.

As shown in FIG. 4, through holes 56 are formed in the mounting wall portion 54E of the under cover reinforcement 54 at predetermined intervals along the vehicle longitudinal direction.

As shown in FIG. 2, these through holes 56
Is coaxial with the mounting hole 33, and the inserted bolt 5
8 is screwed into the weld nut 35, so that the center undercover 20 is attached to the lower surface 2 of the center floor pan 26.
6A.

A work hole 60 for attaching a bolt 58 is formed in a portion of the center under cover 20 facing the through hole 56. The working hole 60 is closed by a lid 52 made of a rubber material, so that water, dust, and the like do not enter between the undercover reinforcement 54 and the center undercover 20.

As shown in FIG. 1, an undercover reinforcement 64 extending in the front-rear direction of the vehicle body is provided on the upper surface 20B of the center undercover 20 facing the under reinforcement 30. As shown in FIG.
The coupling structure between the undercover reinforcement 64 and the underreinforcement 30 is the same as the coupling structure between the underreinforcement 30 and the undercover reinforcement 64, and a description thereof will be omitted.

Next, the operation of this embodiment will be described. In the underbody structure of the vehicle of this embodiment, the center floor pan 2
6, between the tunnel portion 28 and the rocker 34, the under reinforcements 30 and 32 extending in the vehicle longitudinal direction are arranged on the lower surface 26 </ b> A of the center floor pan 26.
On these under reinforcements 30 and 32 and the rocker 34, an under cover reinforcement 42 extending in the vehicle longitudinal direction provided on the upper surface 20 </ b> B of the center under cover 20 covering the center floor pan 26,
54 and 64 are fixed by bolts 48 and 58 and weld nuts 39 and 35, respectively.

Accordingly, the center floor pan 26 and the center undercover 20 are fixed at many locations, and the surface rigidity of the center undercover 20 alone is increased by the undercover reinforcements 42, 54, 64. Vibration can be suppressed. In addition, since the surface rigidity of the center undercover 20 alone increases, the handling of the center undercover 20 becomes easy, and the assembling workability and the like are improved.

In this embodiment, since the under reinforcements 30 and 32 and the under cover reinforcements 42, 54 and 64 are provided along the longitudinal direction of the vehicle body, the center floor pan 26 and the center under cover 20 The air flow between them becomes smooth, and it is difficult for hot air to be trapped.

In this embodiment, the bolts 4 are provided inside the under cover reinforcements 42, 54, 64.
Since the heads 8 and 58 are accommodated, the lower surface of the center undercover 20 can be lowered to the minimum ground height.

In this embodiment, since the working holes 50, 60 of the center undercover 20 are closed by the lids 52, 62, water, dust, etc., are conveyed to the undercover reinforcements 42, 54, 64 and the center. Since it does not enter between the under cover 20 and the under cover 20, the generation of rust can be suppressed.

[0031]

The underbody structure of the vehicle according to the present invention has the following features.
A plurality of under reinforcements extending in the front-rear direction of the vehicle body, which are arranged on the lower surface of the vehicle floor between the tunnel portion of the vehicle floor and the rocker, an under cover covering the lower surface of the vehicle floor and the lower surface of the rocker, and a rocker and under of the under cover. The structure is provided with a rocker provided at a position facing the reinforcement and a reinforcement for the undercover fixed to the under reinforcement, so that the surface rigidity of the under cover in a vehicle mounted state and a single body is increased. This has an excellent effect that vibration of the undercover can be suppressed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one half of an underbody structure of a vehicle according to an embodiment of the present invention, as viewed from the front of a vehicle body.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4 is a perspective view showing one half of an under cover of an under body structure of a vehicle according to an embodiment of the present invention, as viewed from obliquely above the rear side of the vehicle body.

FIG. 5 is a perspective view showing a vehicle body to which the underbody structure of the vehicle according to one embodiment of the present invention is applied, as viewed obliquely from the upper rear side of the vehicle body;

FIG. 6 is a cross-sectional view of an underbody structure of a conventional vehicle as viewed from the front of a vehicle body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Auto body 12 Under cover 20 Center under cover 20B Upper surface 26 Center floor pan 26A Lower surface 28 Tunnel part 30 Under lean reinforcement 32 Under lean reinforcement 34 Rocker 42 Reinforcement for under cover 54 Reinforcement for under cover 64 Reinforce for under cover Ment

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (1)

(57) [Claims] 1. An under-reinforcement extending in the front-rear direction of a vehicle body, which is disposed on a lower surface of a vehicle body floor between a tunnel portion of a vehicle body floor and a rocker, an under cover for covering the lower surface of the vehicle body floor and a lower surface of the rocker, An underbody for a vehicle, comprising: an undercover reinforcement provided at a position of the undercover facing the rocker and the underreinforcement and fixed to the rocker and the underleanment. Construction.