JPH11208521A - Body skeleton member of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure wall surface rigidity of a body skeleton member making a closed cross section and extending in the longitudinal direction and to lighten it. SOLUTION: It is a body skeleton member (side sil) 10 of a vehicle consisting of two plate members 12 and 14 connected to each other by flange members 12A, 12B, 14A, 14B along the longitudinal direction to make a flat cross section. The inside plate member 12 is formed of a hollow plate member extrusion molded having a hollow space 18 inside. Two plate parts 20 and 22 of the hollow plate member are integrally connected to each other by a plural number of ribs 24, and the ribs 24 are provided adjacent to each other on curved parts 12C and 12D. Additionally, the inside plate member 12 has a portion (connecting part) 26 on which the two plate members 20 and 22 are crimped and processed on each other, and the ribs 24 on this portion are moved by plastic deformation to the inside of a recessed part previously formed on an inner surface of the plate part in their neighbourhood.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body skeleton member of a vehicle such as an automobile, and more particularly, to a body skeleton member comprising a plurality of plate members connected to each other along a longitudinal direction so as to form a closed cross section. Related.

[0002]

2. Description of the Related Art As one method of manufacturing a body skeleton member which has a closed cross section and extends along a longitudinal direction, such as a locker or a pillar of a vehicle such as an automobile, see, for example, Japanese Patent Laid-Open No. 4-19.
As described in Japanese Patent No. 3689, a method of extruding a body skeleton member as a hollow member by extrusion has been conventionally known. According to this method, the body skeleton member can be manufactured more efficiently than when two plate members are joined to each other along the longitudinal direction so as to form a closed cross section.

[0003]

However, in the body skeleton member manufactured by the conventional method as described above, the skeleton member is formed as a member having a uniform cross-sectional shape in the longitudinal direction by extrusion. If the inside of the cross section of the skeletal member cannot be partially reinforced, and if the thickness is reduced to reduce the weight, the rigidity of the wall surface will decrease and the collapse of the cross section will easily occur. It is difficult to achieve.

[0004] The present invention has been made in view of the above-mentioned problems in a conventional body skeleton member manufactured as a hollow member by extrusion, and the main problems of the present invention are as follows.
By reducing the weight of the plate member forming the body skeleton member that forms a closed cross section and extending along the longitudinal direction without reducing the strength, the weight of the body skeleton member is reduced while ensuring the wall surface rigidity. It is to plan.

[0005]

SUMMARY OF THE INVENTION The main object as described above is, according to the present invention, an arrangement according to claim 1, comprising a plurality of plate members which are connected to each other along a longitudinal direction so as to form a closed cross section. The present invention is achieved by a vehicle body skeleton member, wherein at least one plate member is an extruded hollow plate member having a hollow space therein.

According to the first aspect of the present invention, at least one plate member constituting the body skeleton member is an extruded hollow plate member having a hollow space therein, so that the wall rigidity of at least one plate member is attained. And a large reduction in weight can be achieved while significantly improving the elastic buckling limit of the wall formed by the plate member. The body skeleton member can be deformed in a plastic buckling mode that is stable against a longitudinal load.

According to the present invention, in order to achieve the above-mentioned main object effectively, the hollow plate member may have a curved portion extending along the longitudinal direction. The curved portion is provided with at least one rib extending along the longitudinal direction and integrally connecting the plate portions on both sides of the hollow space. Configuration of claim 2).

According to the second aspect of the present invention, since the bending portion is provided with the rib extending in the longitudinal direction and integrally connecting the plate portions on both sides of the hollow space, the rigidity of the bending portion is improved. Accordingly, it is possible to prevent cross section collapse when a curved portion is formed by bending.

According to the present invention, in order to effectively achieve the above-mentioned main object, in the structure of the above-mentioned claim 1, the hollow plate member extends along the longitudinal direction and extends in the hollow space. A rib that integrally connects the plate portions on both sides of the plate portion, and a portion where the plate portion is press-bonded to each other, and the rib of the portion is formed in a recess formed in advance in the inner surface of the plate portion in the vicinity thereof. It is moved by deformation.
Configuration).

According to the third aspect of the present invention, the rib at the portion where the plate portions are pressure-bonded to each other is moved by plastic deformation into a concave portion formed in advance on the inner surface of the plate portion in the vicinity thereof. Excessive bulges due to this are prevented from being generated in the crimped portion, so that the outer surface and the inner surface of the crimped portion can be formed substantially flat.

[0011]

According to a preferred aspect of the present invention, in the configuration of the first aspect, the body skeleton members are joined to each other at a joining portion along a longitudinal direction so as to form a closed cross section. (Preferred Embodiment 1).

According to another preferred embodiment of the present invention, in the structure of the preferred embodiment 1, the two plate portions of the hollow plate member are configured so as to be integral with each other at a joint (preferred). Aspect 2).

According to another preferred embodiment of the present invention, in the configuration of the preferred embodiment 1, the joint portion of each plate member is configured to extend along substantially the same plane ( Preferred embodiment 3).

According to another preferred embodiment of the present invention, in the configuration of the preferred embodiment 3, the body skeleton member has an asymmetric cross-sectional shape with respect to the plane, and only one of the plate members is a hollow plate. The hollow plate member is configured to have a maximum distance from the plane smaller than the maximum distance of the other plate member from the plane (preferred embodiment 4).

According to another preferred embodiment of the present invention, in the configuration of the second aspect, the hollow plate member has a plurality of curved portions, and a space between the curved portions along the longitudinal direction. There is provided at least one rib extending to connect the plate portions on both sides of the hollow space integrally (preferred embodiment 5).

According to another preferred embodiment of the present invention, in the configuration of the third aspect, the concave portion is formed at the time of extruding the hollow plate member (preferred embodiment 6).

According to another preferred embodiment of the present invention, in the configuration of the third aspect, the total volume of the recess is configured to be substantially the same as the volume of the rib (preferred embodiment 7). ).

According to another preferred embodiment of the present invention, in the configuration of the third aspect, the concave portion is provided on the inner surface on both sides of the rib of the one plate portion (preferred embodiment 8).

According to another preferred embodiment of the present invention, in the configuration of the third aspect, the concave portion is provided on the inner surface on both sides of the rib of both plate portions (preferred embodiment 9).

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing a body frame member of a vehicle according to the present invention applied to a side sill, and FIG. 2 is an enlarged sectional view showing a cross section of the side sill shown in FIG.

In these figures, reference numeral 10 denotes a side sill as a body frame member, and the side sill 10 includes an inner plate member 12 and an outer plate member 14. The inner plate member 12 and the outer plate member 14 have substantially U-shaped cross sections facing each other, and extend in a longitudinal direction corresponding to the front-rear direction of the vehicle. Further, the inner plate member 12 and the outer plate member 14 have flange portions 12A, 12B and 14A, 14B which are in contact with each other at the upper end and the lower end, respectively. The members are joined to each other to form an integral member having a closed cross section.

As shown, the abutment surfaces of the flanges 12A, 12B and 14A, 14B extend substantially along one plane 16. Inner plate member 12 and outer plate member 1
4 has an asymmetric cross-sectional shape with respect to the plane 16, and the maximum distance of the inner plate member 12 from the plane 16 is smaller than the maximum distance of the outer plate member 14 from the plane 16. In the illustrated embodiment, the outer plate member 14 is formed of a normal solid plate member, but the inner plate member 12 has a hollow space 18 therein.
It is formed of an extruded hollow plate member having the following.

The hollow plate member of the inner plate member 12 has two plate portions 20 and 22 which are substantially parallel and spaced from each other,
These plate portions are integrally connected to each other by a plurality of ribs 24. The rib 24 is formed during extrusion of the hollow plate member so as to extend along the longitudinal direction of the inner plate member 12. As shown, the inner plate member 12 has two curved portions 12.
C and 12D, and ribs 24 at these bends.
Is set to be much smaller than other areas.

Further, the two plate portions 20 and 22 of the inner plate member 12 each have the same thickness substantially equal to half the thickness of the outer plate member 14, and the spacing between the two plate members is It is larger than the plate thickness. The plate portions 20 and 22 are integral with each other at the flange portions 12A and 12B, and are pressed against each other by plastic deformation at a connection portion 26 with another member. The rib 24 located at the connecting portion 26 is shown in FIG.
As shown in FIG. 4, on both sides of the rib, the ribs are moved by plastic deformation into recesses 28 and 30 which are formed in advance on the inner surfaces of the two plate members during extrusion molding.

In particular, in the illustrated embodiment, the recess 28
And 30 are set substantially equal to the volume of the corresponding rib 24. Therefore, the connecting portion 26 is connected to the rib 2
4 has a substantially flat outer surface and inner surface without swelling outward even at the portion where it was provided. FIG. 1
In FIG. 2, reference numeral 32 denotes a through hole for connecting another member to the side sill 10.

Although not shown in the drawings, the side sill 10 configured as described above is manufactured, for example, as follows.
First, a substantially flat hollow plate member for forming the inner plate member 12 is formed by extrusion, and the hollow plate member is formed into the inner plate member 12 by plastic deformation such as press working. In this case, it is preferable that the connecting portion 26 is also formed at the same time, and then the through hole 32 is formed.

Further, a substantially plate-like solid plate member is formed into the outer plate member 14 by plastic deformation. Then, as shown in FIGS. 1 and 2, the inner plate member 12 and the outer plate member 14 have their flange portions 12A, 14A and 12A.
B and 14B are arranged so as to contact each other, and in this state, the two plate members 12 and 14 are integrally joined by welding the flange portions to each other by spot welding or the like.

Thus, according to the illustrated embodiment, the inner plate member 1 of the two plate members forming the side sill 10 is provided.
2 is formed of a hollow plate member having a hollow space 18 therein, and the two plate portions 20 and 22 of the hollow plate member are integrally connected to each other by a plurality of ribs 24. The side sill 10 can be significantly reduced in weight as compared with the case where it is formed of a solid plate member having the same thickness, and the inner plate member 12 has a thickness of the two plate portions 20 and 22. Wall rigidity of the inner plate member 12 can be greatly improved as compared with a case where the inner sill member 12 is formed of a solid plate member having a thickness equal to the sum of the thicknesses, thereby ensuring good wall rigidity of the side sill 10. While achieving a significant weight reduction.

For example, a hollow plate member having two plate portions with a plate thickness t separated from each other by 2t with respect to a plate-like solid plate member having a plate thickness of 3t, where t is a certain positive constant value. Has a flexural rigidity ratio and a mass ratio of 2.07 and 0.67, respectively.
Therefore, it is understood from these values that the hollow plate member can greatly improve the wall surface rigidity of the inner plate member 12 and achieve a significant weight reduction.

According to the illustrated embodiment, the curved portions 12C and 12D of the inner plate member 12 are provided with a plurality of ribs 24 at intervals much smaller than other regions. The rigidity of the curved portion can be improved, so that when the inner plate member 12 is formed by plastic deformation, it is possible to reliably prevent the cross section from being collapsed in the curved portion.

According to the illustrated embodiment, in the connecting portion 26 formed by pressing the plate portions 20 and 22 together, the ribs 24 are formed in advance on the inner surfaces of the plate portions on both sides thereof. Since the ribs are moved into the recessed portions 28 and 30 by plastic deformation, the outer surface and the inner surface of the connecting portion can be formed substantially flat without generating an excessive bulging portion due to the rib in the connecting portion 26. .

In particular, according to the illustrated embodiment, the inner plate member 12 having a smaller maximum distance from the plane 16 in the side wall portion is formed by a hollow plate member, and the side sill 10 is generally formed by a hollow plate member.
Is usually subjected to bending stress along the plane near the plane 16, so that the outer plate member is formed by a hollow plate member and the inner plate member is formed by a solid plate member, contrary to the illustrated embodiment. The strength of the side sill can be increased and its durability can be improved as compared with the case of the structure described above.

According to the illustrated embodiment, since the concave portions 28 and 30 are provided on both sides of the rib 24 of the connecting portion 26, these concave portions are provided only on one side in the thickness direction of the rib. And the depth and width of the recess may be smaller than when the recess is provided or only when the recess is provided only on one of the inner surfaces of the plate portions 20 and 22. The connection strength can be ensured, and the possibility that the strength of the inner plate member 12 is reduced due to the concave portions 28 and 30 in the region other than the connecting portion 26 can be reduced.

Further, according to the illustrated embodiment, the total volume of the recesses 28 and 30 is set to be substantially the same as the volume of the corresponding rib 24, so that the ribs 24 of the connecting portion 26 can be formed without any excess or shortage. Can be moved into 28 and 30;
As a result, the flatness of the outer surface and the inner surface of the connecting portion 26 can be increased as compared with the case where the relationship between the volumes is set to another relationship, and voids are generated in the connecting portion. It is possible to reduce the possibility of a decrease in strength due to the above.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments may be included within the scope of the present invention. It will be clear to those skilled in the art that is possible.

For example, in the above embodiment, the body skeletal member is the side sill 10, but the body skeletal member in the present invention is composed of a plurality of plate members connected to each other along the longitudinal direction so as to form a closed cross section. Any body skeleton member of a vehicle may be used as long as at least one plate member is formed of a hollow plate member.

In the above-described embodiment, the side sill 10 as the body skeleton member is formed by the two plate members 12 and 14 joined to each other, but the body skeleton member includes three or more plate members. May be formed. Further, in the above-described embodiment, only one plate member 12 is formed of a hollow plate member, but all plate members constituting the body skeleton member may be formed of a hollow plate member.

Further, in the above embodiment, the connecting portion 2
The recesses 28 and 30 are provided on the inner surfaces of the plate members 20 and 22 on both sides of the rib 24 of FIG. 6. For example, the recesses are provided only on one inner surface of the plate members 20 and 22 as shown in FIG. Alternatively, it may be provided on both inner surfaces of the plate members 20 and 22 on one side of the rib 24.
In these cases, it is preferable that the total volume of the concave portions is set substantially equal to the volume of the corresponding rib.

[0040]

As is apparent from the above description, according to the first aspect of the present invention, at least one plate member constituting the body skeleton member is an extruded hollow plate having a hollow space therein. Since it is a member, it is possible to significantly reduce the weight while significantly improving the wall rigidity of at least one plate member, thereby increasing the elastic buckling limit of the wall surface formed by the plate member. In addition, the body skeleton member can be deformed in a plastic buckling mode that is stable against a longitudinal load at the time of a vehicle collision or the like.

According to the second aspect of the present invention, since the curved portion is provided with the rib extending in the longitudinal direction and integrally connecting the plate portions on both sides of the hollow space, the rigidity of the curved portion is reduced. Thus, it is possible to effectively prevent the cross section from being collapsed when the curved portion is formed by the bending process, and to form the curved portion satisfactorily.

According to the third aspect of the present invention, the rib at the portion where the plate portions are pressure-bonded to each other is moved by plastic deformation into a concave portion formed in advance on the inner surface of the plate portion in the vicinity thereof. This prevents an excessive bulging portion from being caused in the crimping portion, thereby making it possible to form the outer surface and the inner surface of the crimping portion substantially flat, and to omit a rib located in the crimping portion. As a result, the strength of the plate member can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a body frame member of a vehicle according to the present invention applied to a side sill.

FIG. 2 is an enlarged sectional view showing a cross section of the side sill shown in FIG.

FIG. 3 is an enlarged partial sectional view showing a crimping portion of the side sill shown in FIG. 1;

FIG. 4 is an enlarged partial cross-sectional view showing a crimped portion of the side sill shown in FIG. 1 before a crimping process.

FIG. 5 is an enlarged partial cross-sectional view showing another embodiment of the crimping portion of the side sill shown in FIG. 1 in a state before the crimping process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Side sill 12 ... Inner plate member 14 ... Outer plate member 18 ... Hollow space 20, 22 ... Plate part 24 ... Rib 26 ... Connection part 28, 30 ... Depression

Claims (3)

[Claims] An extruded hollow body having at least one plate member having a hollow space therein, wherein the body frame member comprises a plurality of plate members joined to each other along a longitudinal direction so as to form a closed cross section. A body frame member for a vehicle, which is a plate member. 2. The hollow plate member is bent so as to have a curved portion extending along the longitudinal direction, and the curved portion extends along the longitudinal direction and is provided on both sides of the hollow space. The body skeleton member for a vehicle according to claim 1, wherein at least one rib for integrally connecting the plate portions is provided. 3. The hollow plate member has a rib extending along the longitudinal direction and integrally connecting plate portions on both sides of the hollow space, and a portion where the plate portions are pressed together. The vehicle body skeleton member according to claim 1, wherein the rib at the portion is moved by plastic deformation into a concave portion formed in advance on an inner surface of the plate portion in the vicinity thereof.