JP2004216957A - Floor structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively transmit input load at the time of front collision and side collision. <P>SOLUTION: A load inputted to dash cross closed sections 27, 28 is transmitted to rear cross closed sections 34, 36 arranged on a same plane as tunnel closed sections 14 and connected with each other via the tunnel closed sections 14 arranged on the same plane as the dash cross closed sections 27, 28 and connected with each other. The load inputted to a floor cross closed section 46 on the collision side is transmitted to an opposite floor cross closed section 46 arranged on the same plane as the tunnel closed sections 14 and connected with each other via the tunnel closed sections 14 arranged on the same plane as the dash cross closed section 46 and connected with each other. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a floor structure of a vehicle, and particularly to a floor structure of a vehicle such as an automobile.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a floor structure of a vehicle such as an automobile, a floor tunnel constituent member in which a concave surface that is open downward and has a flat top surface and is continuous downward in a vehicle front-rear direction is an extruded product of a light alloy material. In addition, there has been known a configuration in which a continuous closed cross section is formed at a corner of the top surface of a floor tunnel constituent member (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-128026
[Problems to be solved by the invention]
However, in such a configuration, the closed cross section formed in the floor tunnel portion is formed at the corner of the top surface of the floor tunnel constituent member, and is not continuous in the vehicle width direction. As a result, the input load acting on the collision side cross member at the time of a side collision cannot be effectively transmitted to the opposite side cross member via the floor tunnel portion.
[0005]
An object of the present invention is to provide a vehicle floor structure capable of effectively transmitting an input load at the time of a frontal collision and a side collision in consideration of the above fact.
[0006]
[Means for Solving the Problems]
The floor structure of the vehicle according to the first aspect of the present invention includes a tunnel closed cross-section that forms a floor tunnel portion extending along the vehicle front-rear direction at the center of the floor in the vehicle width direction;
A dash cross closed cross section that constitutes a dash cross member extending along the vehicle width direction at the front of the floor,
A pair of left and right floor cross closed cross sections that form a pair of left and right floor cross members extending along the vehicle width direction at the front and rear intermediate portions of the floor,
A rear cross closed cross section that constitutes a rear cross member extending along the vehicle width direction at the rear of the floor,
Wherein the pair of left and right floor crosses, the tunnels, the dash crosses, and the rear crosses are arranged on the same plane and connected to each other.
[0007]
Therefore, when the vehicle has a frontal collision, the load input to the dash cross closed section is effectively transmitted to the rear cross closed section via the tunnel closed section when the load is arranged on the same plane as the dash cross closed section and connected to each other. Is done.
[0008]
Also, when the vehicle collides, the load input to the closed cross section of the collision side is placed on the same plane as the closed cross section of the dash cross and connected to each other. Effectively transmitted to the closed section.
[0009]
As a result, the input load can be effectively transmitted at the time of a frontal collision and a side collision. Further, in addition to the improvement in the front collision performance and the side collision performance, the torsion and bending rigidity of the vehicle body can be improved.
[0010]
According to a second aspect of the present invention, in the vehicle floor structure according to the first aspect, the tunnel closed section is divided into a plurality of divided sections along the vehicle front-rear direction, and only a part of the divided closed section is parked. It is characterized in that a through hole for a brake cable is formed, and another divided closed section in which the through hole is not formed is a rear heater duct.
[0011]
Therefore, in addition to the effect of the first aspect, the closed section of the tunnel is divided into a plurality of divided sections along the longitudinal direction of the vehicle, and a through hole for a parking brake cable is formed only in a part of the divided closed section. At the same time, the other closed closed section without the through hole is used as the rear heater duct, so the parking brake cable can be installed through the closed tunnel section and the other closed closed section without the through hole is used as the rear heater duct. it can.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a vehicle floor structure according to the present invention will be described with reference to FIGS.
[0013]
In the drawings, the arrow FR indicates the forward direction of the vehicle body, and the arrow UP indicates the upward direction of the vehicle body.
[0014]
As shown in FIG. 2, in the present embodiment, a tunnel portion 12 extends along the vehicle front-rear direction at the center of the floor 10 of the vehicle body in the vehicle width direction.
[0015]
As shown in FIG. 4, the tunnel portion 12 is made of an extruded material of a light alloy such as aluminum, and has a hat-like cross section viewed from the vehicle front-rear direction with an opening directed downward. A tunnel closed section 14 is formed along the vehicle front-rear direction in the entire upper portion of the tunnel section 12, and the tunnel closed section 14 is formed of three tunnels as divided closed sections extending along the vehicle front-rear direction. It is divided into closed sections 16, 18, and 20 along the vehicle width direction.
[0016]
As shown in FIG. 1, a dash cross member 22 extends in the vehicle width direction at a front portion of the floor 10, and both end portions 22A of the dash cross member 22 in the vehicle width direction are respectively provided on the left and right front cyto domain bars. 23. The dash cross member 22 is made of a light alloy extruded material such as aluminum, and has a dash cross closed section 24 extending along the vehicle width direction. The dash cross closed section 24 is divided along the vehicle up-down direction into three dash cross closed sections 26, 27, and 28 extending along the vehicle width direction. , 28 are arranged at the same height as the tunnel closed section 14 in a side view, that is, on the same plane.
[0017]
As shown in FIG. 2, a rear cross member 30 extends along the vehicle width direction at the rear of the floor 10 along the vehicle width direction, and both ends 30A and 30B of the rear cross member 30 are respectively It is connected to lockers 32 and 34.
[0018]
As shown in FIG. 1, the rear cross member 30 is made of an extruded material of a light alloy such as aluminum, and the rear cross member 30 has three rear cross closed sections 32 and 34 extending along the vehicle width direction. It is divided into 36 along the vehicle up-down direction. The rear cross closed section 34 at the center in the vertical direction is disposed at the same height as the tunnel closed section 14 in a side view, that is, on the same plane.
[0019]
As shown in FIG. 2, a pair of left and right front floor cross members 40 are disposed along the vehicle width direction along the vehicle width direction at an intermediate portion in the front-rear direction of the floor 10. The vehicle width direction outer ends 40A are connected to rockers 32 and 34, respectively. The inner end 40B in the vehicle width direction of the front floor cross member 40 is connected to the tunnel portion 12 via a joint 44. The joint 44 is made of a casting, and covers the vehicle width direction inner end 40B of the front floor cross member 40 and the tunnel portion 12 from above the vehicle in a vehicle width direction inner end of the front floor cross member 40. 40B and the tunnel portion 12 are welded.
[0020]
As shown in FIG. 1, the front floor cross member 40 is made of an extruded material of a light alloy such as aluminum, and has a hat-like cross section viewed from the vehicle width direction with an opening directed downward. ing. A floor cross closed section 46 is formed along the vehicle width direction in the entire upper area of the front floor cross member 40, and the floor cross closed section 46 has the same height as the tunnel closed section 14 in a side view, that is, , On the same plane.
[0021]
On the upper surface 44A of the joint 44, a convex portion 54 having a through hole 52 through which the parking brake cable 50 is inserted is formed, and three tunnel closed sections 16, 18 located substantially below the convex portion 54 are formed. , 20, through holes 56 (see FIG. 4) for parking brake cables are formed in the upper and lower walls of the tunnel closed section 18 at the center in the vehicle width direction.
[0022]
On the other hand, the left and right tunnel closed sections 16, 20 of the three tunnel closed sections 16, 18, 20 are not formed with through holes for parking brake cables, and serve as heater ducts.
[0023]
As shown in FIG. 1, rear heater duct introduction ports 62 to which rear heater ducts 60 are connected are formed on the front upper surfaces of the tunnel closed sections 16 and 20, respectively. A rear heater duct outlet 66 to which a rear heater duct 64 is connected is formed at an upper portion of the side wall 12A of the tunnel portion 12 serving as a wall.
[0024]
Next, the operation of the present embodiment will be described.
[0025]
In the present embodiment, when the vehicle collides forward, the loads (arrows F1 in FIG. 2) input to the dash cross closed sections 27 and 28 from the left and right front cymbars 23 are the same as the dash cross closed sections 27 and 28. Via the closed tunnel cross section 14 arranged on the plane and connected to each other, it is effectively transmitted to the rear cross closed sections 34, 36 arranged on the same plane as the closed tunnel section 14 and connected to each other. A part of the input load F1 is also transmitted to the floor cross closed section 46 arranged on the same plane as the tunnel closed section 14 and connected to each other.
[0026]
Further, when the vehicle has a side collision, the load (arrow F2 in FIG. 2) input from the collision side rocker 32 to the collision side floor cross closed section 46 is arranged on the same plane as the floor cross closed section 46. Via the mutually connected tunnel closed section 14, it is transmitted to the opposite floor cross closed section 46 which is arranged on the same plane as the tunnel closed section 14 and connected to each other, and is effectively transmitted to the opposite rocker 34. You. Further, the load F2 input to the floor cross closed section 46 can be received by the side wall 12A of the tunnel portion 12, and a part of the input load F2 is arranged on the same plane as the floor cross closed section 46 and connected to each other. It is also transmitted to the tunnel closed section 14.
[0027]
As a result, in the present embodiment, the input load can be effectively transmitted at the time of a frontal collision and a side collision. Further, in addition to the improvement in the front collision performance and the side collision performance, the torsion and bending rigidity of the vehicle body can be improved.
[0028]
Further, in the present embodiment, from the front dash cross closed sections 27 and 28 to the rear rear cross closed sections 34 and 36, the tunnel section 12 made of one extruded material is used, so that the welding portion in the tunnel section 12 is formed. No cross section, offset part is made. As a result, generation of a moment with respect to the input load at the time of a frontal collision is also suppressed. For this reason, at the time of a front collision, the tunnel portion 12 is not deformed or broken at the welded portion, the discontinuity in the cross section, or the offset portion, and the input load at the time of the front collision can be effectively transmitted also at this point. Further, by forming the tunnel portion 12 with one extruded material, it is possible to improve productivity and reduce costs.
[0029]
In the present embodiment, the tunnel closed section 14 is divided into three tunnel closed sections 16, 18, and 20, and only one tunnel closed section 18 is formed with the through hole 56 for the parking brake cable. The parking brake cable 50 can be provided through the section 18 and the other tunnel closed sections 16 and 20 having no through holes can be used as heater ducts, so that functions can be integrated. Further, the size and weight of the rear heater duct component can be reduced.
[0030]
Further, in the present embodiment, since the convex portion 54 having the through hole 52 for inserting the parking brake cable 50 is formed on the upper surface 44A of the joint 44 made of casting, the tunnel portion 12 which is an extruded material is formed. Complicated processing can be reduced as compared with the configuration in which the convex portion 54 having the through hole 52 is formed.
[0031]
Further, in a state where the joint 44 covers the vehicle width direction inner end 40B of the front floor cross member 40 and the tunnel portion 12 from above the vehicle, the vehicle width direction inner end 40B of the front floor cross member 40 and the tunnel portion 12 Therefore, the welding position with the front floor cross member 40 becomes flexible in the vehicle width direction. That is, the welding position between the joint 44 and the front floor cross member 40 can be adjusted in the vehicle width direction. As a result, the assembly accuracy of the left and right front floor cross members 40 can be improved. In addition, the joint 44 can prevent a fold that is likely to occur at the front-rear center portion of the tunnel portion 12 at the time of a front collision.
[0032]
In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to such an embodiment, and various other embodiments are possible within the scope of the present invention. Some will be apparent to those skilled in the art. For example, in the above embodiment, the dash cross closed sections 27 and 28, the tunnel closed section 14, the rear cross closed sections 34 and 36, and the floor cross closed section 46 are arranged on the same plane. The cross sections 27 and 28, the tunnel closed section 14, the rear cross closed sections 34 and 36, and the floor cross closed section 46 may be arranged on the same inclined plane.
[0033]
【The invention's effect】
The vehicle floor structure according to the first aspect of the present invention has a tunnel closed section forming a floor tunnel portion extending along the vehicle front-rear direction at the center of the floor in the vehicle width direction, and a vehicle width direction at a front portion of the floor. And a pair of left and right floor cross members forming a pair of left and right floor cross members extending along the vehicle width direction at the front and rear middle part of the floor. A rear cross member that constitutes a rear cross member extending along the vehicle width direction at the rear of the floor, and a pair of left and right floor cross sections, a tunnel closed section, a dash cross closed section, and a rear cross closed section. Are arranged on the same plane and are connected to each other, so that an excellent effect that the input load can be effectively transmitted at the time of a frontal collision and a side collision is provided. Further, in addition to the improvement of the front collision performance and the side collision performance, there is an excellent effect that the torsion and bending rigidity of the vehicle body can be improved.
[0034]
According to a second aspect of the present invention, in the vehicle floor structure according to the first aspect, the closed section of the tunnel is divided into a plurality of divided sections along the vehicle front-rear direction, and the parking brake is provided only in a part of the divided closed section. In addition to forming a through hole for cabling, the other closed section that does not form a through hole is used as a rear heater duct, so that a parking brake cable can be installed through the closed section of the tunnel and another section without a through hole. There is an excellent effect that the closed section can be used as a rear heater duct.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a floor structure of a vehicle according to an embodiment of the present invention, as viewed obliquely from the front of the vehicle.
FIG. 2 is a plan view showing a floor structure of the vehicle according to one embodiment of the present invention.
FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 2;
FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3;
[Explanation of symbols]
10 floor 12 tunnel section 14 tunnel closed section 16 tunnel closed section (divided closed section)
18 Tunnel closed section (split closed section)
20 Tunnel closed section (split closed section)
22 Dash Cross Member 24 Dash Cross Closed Section 26 Dash Cross Closed Section 27 Dash Cross Closed Section 28 Dash Cross Closed Section 30 Rear Cross Member 32 Rear Cross Closed Section 34 Rear Cross Closed Section 36 Rear Cross Closed Section 40 Front Floor Cross Member 44 Joint 46 Floor Cross Closed cross section 50 Parking brake cable 56 Through hole for parking brake cable

Claims (2)

A tunnel closed cross section that forms a floor tunnel portion extending along the vehicle front-rear direction at the center of the floor in the vehicle width direction,
A dash cross closed cross section that constitutes a dash cross member extending along the vehicle width direction at the front of the floor,
A pair of left and right floor cross closed cross sections that form a pair of left and right floor cross members extending along the vehicle width direction at the front and rear intermediate portions of the floor,
A rear cross closed cross section that constitutes a rear cross member extending along the vehicle width direction at the rear of the floor,
Wherein the pair of left and right floor crosses, the tunnels, the dash crosses, and the rear crosses are arranged on the same plane and connected to each other. Construction. The tunnel closed section is divided into a plurality of divided sections along the longitudinal direction of the vehicle, and a through hole for a parking brake cable is formed only in a part of the closed cross section, and another divided closed section not forming the through hole is formed. The vehicle floor structure according to claim 1, wherein the cross section is a rear heater duct.

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