JP5206376B2 - Body frame material structure - Google Patents

Description

  The present invention relates to an automobile body frame material structure.

Conventionally, skeleton materials such as side members, side sills, and center pillars have been used for automobile bodies. Such a vehicle body skeleton material is required to have high rigidity.
Therefore, a technique for increasing the torsional rigidity by providing a reinforcing member on the vehicle body frame material is known, for example, from Patent Document 1.
Patent Document 1 describes a technique for increasing torsional rigidity by welding a reinforcing beam having a closed cross-sectional shape that crosses the cross-section of the side sill at the intersection of the side sill and the center pillar.
Japanese Patent Laid-Open No. 08-20363

  However, in the technique of providing the reinforcing member inside the vehicle body skeleton as described above, the number of parts, the weight, and the number of manufacturing processes are increased by the amount of the reinforcing member.

  The present invention has been made paying attention to the above-mentioned conventional problems, and aims to improve the torsional rigidity of the vehicle body skeleton while suppressing the number of parts.

  In order to achieve the above object, the vehicle body skeleton material structure of the present invention is characterized in that an anisotropic material having a high rigidity direction in a predetermined direction is applied to a first metal panel material among a plurality of metal panel materials forming a skeleton member. And the high-rigidity direction of the second metal panel material is set to a direction inclined obliquely with respect to the longitudinal direction of the skeleton member, and the high-rigidity direction of the second metal panel material is set to the high-rigidity direction of the first metal panel material. The cross direction was set with respect to the direction.

Since the high-rigidity direction of the first metal panel material and the high-rigidity direction of the second metal panel material tend to be oblique to the longitudinal direction of the vehicle body frame material, no anisotropic material is used for the vehicle body frame material The torsional rigidity with the longitudinal direction of the body frame material as the axis is improved as compared with the above.
Moreover, since the high-rigidity direction of the first metal panel material and the high-rigidity direction of the second metal panel material are set in the crossing direction, the rigidity in the torsional direction with the longitudinal direction as the axis is set to either the forward or reverse torsional direction. Can also be improved. Therefore, the torsional rigidity of the body frame material can be further increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The vehicle body skeleton material structure of the embodiment of the present invention is a vehicle body formed into a hollow column shape by combining a plurality of metal panel materials (111, 112, 121, 122) including at least first and second metal panel materials. In the skeleton material structure, an anisotropic material having a high rigidity direction directed to a predetermined direction is used for the plurality of metal panel materials (111, 112, 121, 122), and the first metal panel material (111 , 122) is set obliquely with respect to the direction along the longitudinal direction of the vehicle body skeleton member, and the high rigidity direction of the second metal panel member (112, 121) is set. Is a vehicle body skeleton material structure characterized in that the first metal panel material (111, 122) is set in a direction intersecting the high-rigidity direction.

  Based on FIGS. 1-9, the vehicle body frame | skeleton structure of Example 1 of this invention is demonstrated.

  The body frame structure of the first embodiment is applied to the side sill 1 of the vehicle body BD shown in FIG. The side sill 1 is in the vehicle front-rear direction at both side edges in the vehicle width direction of the floor panel 2 (in the figure, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow OUT indicates the vehicle outer direction in the vehicle width direction). It is a car body skeleton material that is extended.

A plurality of cross members 3, 3 are provided along the floor panel 2 between the side sills 1 arranged on the left and right sides of the vehicle. Further, a center pillar 4 is raised from an intermediate portion of the side sill 1 in the vehicle longitudinal direction.
A winding device 51 for the seat belt device 5 is built in the lower portion of the center pillar 4. The webbing 52 drawn out from the winding device 51 is inserted into a ring member 53 provided at the upper portion of the center pillar 4 and folded downward, and is seated on a seat belt anchor (support member) 54 coupled to the side sill 1. It is connected.
Further, the webbing 52 is provided with a tongue 55. As shown in FIG. 3, the tongue 55 is engaged with a buckle 57 at the tip of another webbing 56 extending from the floor panel 2, so that the seat belt device 5 is engaged. However, the passenger MN is restrained.

Next, the details of the structure of the side sill 1 will be described.
The side sill 1 includes a sill inner panel 11 which is a metal panel material formed in a substantially hat shape in cross section shown in FIG. 4 and a sill outer panel 12 which is a metal panel material formed in a substantially hat shape in cross section shown in FIG. I have. The side sill 1 is formed by spot-welding the sill inner panel 11 and the sill outer panel 12 between the upper and lower coupling flange portions 11f and 12f.

As shown in FIG. 1, the sill inner panel 11 includes an upper inner panel material (first metal panel material) 111 having a lower end edge of a vertical wall portion 111 a and a lower inner panel material (second metal panel material) 112. The upper edge of the vertical wall 112a is joined by laser welding at a laser welded portion LZ1 (see FIG. 4).
Similarly, the sill outer panel 12 has a lower end edge portion of the vertical wall portion 121a of the upper outer panel material (second metal panel material) 121 and a vertical wall portion 122a of the lower outer panel material (first metal panel material) 122. The upper edge portion is formed by laser welding at a laser welding portion LZ2 (see FIG. 5).

An anisotropic steel plate is used for the upper inner panel material 111, the lower inner panel material 112, the upper outer panel material 121, and the lower outer panel material 122.
This anisotropic steel plate is a steel plate having properties of high rigidity and strength only in a predetermined direction.
FIG. 6 is an explanatory diagram of the direction of strength and strength of the anisotropic steel plate. Normally, iron atoms a mainly have a body-centered cubic lattice structure, but in anisotropic steel sheets, the distance between atoms a and a has a dense direction and a sparse direction as shown in the figure. It has become an atomic arrangement.
For this reason, the direction of the arrow A in which the distance between the atoms a and a is dense is the highest in rigidity and strength. Next, in the order of the arrow B direction orthogonal to the arrow A direction and the arrow C direction oblique to the arrow A direction, Increased stiffness and strength.

In the first embodiment, the upper inner panel material 111 forming the sill inner panel 11 has a direction in which the rigidity and strength are highest (hereinafter, this direction is referred to as a high rigidity direction) in the direction of the arrow G11 in the vertical wall portion 111a. Is set to face. That is, the high rigidity direction of the vertical wall portion 111 a of the upper inner panel member 111 is set to face the vehicle front upper direction that is a direction inclined with respect to the vehicle front-rear direction that is the longitudinal direction of the side sill 1. The seat belt anchor 54 described above is coupled to the upper inner panel material 111.
On the other hand, the vehicle front lower side in which the high rigidity direction in the vertical wall portion 112a of the lower inner panel material 112 is the direction indicated by the arrow G12, that is, the direction that intersects the high rigidity direction (G1) of the upper inner panel material 111 at a substantially right angle. Set to direction.

Further, in the sill outer panel 12, in the upper outer panel material 121, the high rigidity direction in the vertical wall 121a is the direction indicated by the arrow G21, that is, the direction that intersects the high rigidity direction of the upper inner panel material 111 substantially at a right angle. It is set forward and downward.
On the other hand, the high rigidity direction in the vertical wall portion 122a of the lower outer panel material 122 is a direction that intersects the direction indicated by the arrow G22, that is, the direction substantially perpendicular to the high rigidity directions of the upper outer panel material 121 and the lower inner panel material 112. It is set to face up.

Next, the operation of the first embodiment will be described.
(Manufacturing)
When a panel material P having a substantially hat cross section as shown in FIG. 7A similar to the sill inner panel 11 and the sill outer panel 12 is press-molded, the panel material P has a shape as shown in FIG. 7B. A springback that tries to return to the original state occurs due to elastic deformation.
As shown in FIG. 8, the amount of spring back is proportional to the Young's modulus and strength, and increases as the Young's modulus and strength increase.

  Therefore, when an anisotropic steel plate is used as the panel material P shown in FIG. 7 and the high rigidity direction is directed to the arrow P1, there is a difference in the amount of opening up and down as shown in FIG. On the other hand, if the direction of the high rigidity direction is reversed, the opening amount on the upper side is increased, contrary to FIG.

Therefore, when the panel material P is applied to the sill inner panel 11 and the sill outer panel 12 of the first embodiment and the high rigidity directions are set in opposite directions, the vertical opening amounts are different, and the positions of the upper and lower coupling flange portions are different. It becomes difficult to match.
In this case, a press mold that takes such deformation into consideration is necessary, and it takes time to manufacture the mold.

On the other hand, in the first embodiment, the sill inner panel 11 and the sill outer panel 12 are divided into an upper inner panel material 111, a lower inner panel material 112, an upper outer panel material 121, and a lower outer panel material 122, respectively. The structure. Furthermore, the upper inner panel material 111 and the lower inner panel material 112 set the high rigidity direction vertically symmetrical, and the upper outer panel material 121 and the lower outer panel material 122 set the high rigidity direction vertically symmetrical. Furthermore, the inner panel members 111 and 112 were set in the opposite direction.
For this reason, it is possible to suppress the difference in opening between the upper and lower sides during pressing, to obtain high dimensional stability and to facilitate the manufacture of the mold.

(When torsion input)
When the side sill 1 receives a torsional input with the longitudinal direction of the vehicle as the axis, the main stress is generated in an oblique direction with respect to the longitudinal direction. On the other hand, the side sill 1 of Example 1 sets the high-rigidity direction of each panel material 111,112,121,122 in this diagonal direction, and sets the high-rigidity direction upside down and inside and outside. Therefore, the rigidity is improved in either the forward or reverse direction of the torsion as compared with the case where no anisotropic steel plate is used.
As a result, the torsional rigidity of the side sill 1 can be improved by about 20% as compared with that using no anisotropic steel plate.

(At the time of load input from the seat belt device 5)
When the occupant MN wears the seat belt device 5 during the sudden braking operation, a load is applied to the side sill 1 obliquely forward and upward of the vehicle indicated by the arrow F in the seat belt anchor 54 as shown in FIG.
In the first embodiment, since the high rigidity direction of the upper inner panel material 111 to which the seat belt anchor 54 is coupled is set to substantially coincide with the load input direction, an anisotropic steel plate is not used. As compared with the above, the strength of the joint portion of the seat belt anchor 54 is improved.

As described above, in the vehicle body skeleton material structure of the first embodiment, the effects listed below can be obtained.
a) Anisotropic steel is used as each of the panel members 111, 112, 121, and 122 forming the side sill 1, and the high rigidity direction is mainly generated when the side sill 1 receives a torsional input with the longitudinal direction as an axis. It was set in an oblique direction with respect to the vertical direction, which is the direction of stress.
Therefore, the rigidity against torsional input could be improved without providing a reinforcing member as compared with the side sill 1 not using an anisotropic steel plate.
Moreover, since the high rigidity direction of each panel material 111, 112, 121, 122 is set to the cross direction of the opposite direction in the vertical direction and the inside / outside, the rigidity is improved in either the forward or reverse direction of this torsion. To do.
Therefore, the number of parts can be reduced, the weight and cost can be reduced, and the degree of freedom in design can be increased as compared with the case where the torsional rigidity is improved by using the reinforcing member.

b) The high-rigidity direction of the coupling position of the seat belt anchor 54 is set to the upper front side of the vehicle, which is the direction in which the load from the seat belt device 5 is input.
Therefore, the strength against the load from the seat belt anchor 54 can be improved without providing a reinforcing member, which is advantageous in terms of weight and cost as compared with those using the reinforcing member.

c) The sill inner panel 11 and the sill outer panel 12 have a vertically divided structure, and the high rigidity directions of the panel members 111, 112, 121, and 122 are vertically symmetrical.
Therefore, it is possible to suppress the difference between the upper and lower opening amounts due to the spring back during press molding, and high dimensional stability can be obtained. Also, the mold can be easily manufactured.

  d) For the sill inner panel 11 and the sill outer panel 12, laser welding is used to join the upper and lower inner panel materials 111 and 112 and the upper and lower outer panel materials 121 and 122, respectively. For this reason, compared with what uses spot welding etc., the rigidity of the sill inner panel 11 and the sill outer panel 12 can be made high.

(Other examples)
Other embodiments will be described below. Since these other embodiments are modifications of the first embodiment, only the differences will be described, and the configuration common to the first embodiment or the other embodiments will be described. The description is omitted by giving a common reference numeral.

The vehicle body skeleton material structure of Example 2 will be described based on FIGS. 10 and 11.
Example 2 is an example applied to the side sill 1 in the same manner as in Example 1. In Example 2, the sill inner panel 201 and the sill outer panel 202 are each formed of a single metal panel material. is there.

  Even in the second embodiment, an anisotropic steel material is used as a metal panel material for forming both panels 201 and 202. And the sill inner panel 201 sets the high rigidity direction of the vertical wall part 211 to the vehicle front upper direction, as shown by arrow G201. Further, in the sill outer panel 202, the high rigidity direction of the vertical wall portion 222 is set to the vehicle front lower direction and the intersecting direction of the high rigidity direction of the vertical wall portion 211.

Even in the second embodiment, the torsional rigidity can be increased because the sill inner panel 11 and the sill outer panel 12 constituting the side sill 1 are directed in a direction intersecting the high rigidity direction. In addition, since the high rigidity direction is made different between the sill inner panel 11 and the sill outer panel 12, the rigidity can be increased regardless of whether the torsion direction is forward or reverse.
Furthermore, the strength against the load from the seat belt anchor 54 can be improved without providing a reinforcing member.

  As mentioned above, although embodiment and Example 1-2 of this invention were explained in full detail with reference to drawings, specific structure is not restricted to this embodiment and each Example 1-2, this invention. Design changes that do not depart from the gist of the present invention are included in the present invention.

  For example, in Examples 1 and 2, the side sill is shown as the skeleton member, but the skeleton member to which the present invention is applied is not limited to the side sill. For example, it can be applied to other skeleton members such as side members, cross members, and pillars. In this case, the direction of the high rigidity is not limited to the direction shown in the embodiment as long as it is inclined in the torsional direction with respect to the longitudinal direction of the skeleton member. For example, in the case of a pillar whose longitudinal direction is in the vehicle up-down direction, it may be tilted with respect to the vehicle up-down direction, and is tilted in the vehicle front-rear direction or the vehicle left-right direction. Moreover, when applying to a side sill, the high rigidity direction may be set to a direction different from the direction shown in the first embodiment.

It is a disassembled perspective view which shows the side sill 1 to which the vehicle body frame | skeleton structure of Example 1 which is the best form of this invention is applied. It is a perspective view which shows the vehicle body BD which has the side sill 1 to which the vehicle body frame material structure of Example 1 is applied. It is a perspective view which shows the mounting state of the seatbelt apparatus 5 which the side sill 1 to which the vehicle body frame material structure of Example 1 applies. It is a perspective view which shows the sill inner panel 11 used for the side sill 1 to which the vehicle body frame material structure of Example 1 is applied. It is a perspective view which shows the sill outer panel 12 used for the side sill 1 to which the vehicle body frame material structure of Example 1 is applied. It is explanatory drawing which shows the outline of the atomic structure of the anisotropic steel plate used for the side sill 1 to which the vehicle body frame material structure of Example 1 was applied. It is explanatory drawing of the twist phenomenon which arises by a springback. It is a characteristic view explaining the generation principle of a springback. It is explanatory drawing of the difference in the opening angle which arises at the time of press molding of the panel material P. FIG. It is a perspective view which shows the sill inner panel 201 used for the side sill to which the vehicle body frame material structure of Example 2 is applied. It is a perspective view which shows the sill outer panel 202 used for the side sill to which the vehicle body frame material structure of Example 2 is applied.

Explanation of symbols

1 Side sill (body frame material)
5 Seat belt device 11 Sill inner panel 12 Sill outer panel 52 Webbing 54 Seat belt anchor (supporting member)
111 Upper inner panel material (first metal panel material)
112 Lower inner panel material (second metal panel material)
121 Upper outer panel material (second metal panel material)
122 Lower outer panel material (first metal panel material)
201 Sill inner panel (first metal panel material)
202 Sill outer panel (second metal panel material)
BD body

Claims (4)

A vehicle body skeleton material structure formed by combining a plurality of metal panel materials including at least a first and a second metal panel material into a hollow column shape,
For the plurality of metal panel materials, an anisotropic material having a high-rigidity direction facing a predetermined direction is used,
The high-rigidity direction of the first metal panel member is set obliquely with respect to the direction along the longitudinal direction of the vehicle body skeleton member, and the high-rigidity direction of the second metal panel member is The vehicle body skeleton material structure is set in a crossing direction with respect to the high-rigidity direction of the first metal panel material. The vehicle body skeleton member is a side sill extending in the vehicle front-rear direction along both ends of the vehicle body floor in the vehicle width direction;
The side sill includes a sill inner panel as the first metal panel material disposed on the vehicle interior side, and a sill outer panel as the second metal panel material disposed on the vehicle exterior side,
2. The high rigidity direction of one of the sill inner panel and the sill outer panel is inclined upward in the front of the vehicle, and the other high rigidity direction is inclined downward in the rear of the vehicle. Body frame material structure. The sill inner panel and the sill outer panel are each formed in a substantially hat cross-sectional shape having a flange for joining up and down,
The sill inner panel is vertically divided into an upper inner panel as the first metal panel material and a lower inner panel as the second metal panel material,
The sill outer panel is vertically divided into an upper outer panel as the second metal panel material and a lower outer panel as the first metal panel material,
2. The vehicle body skeleton structure according to claim 1, wherein the high-rigidity direction of the upper inner panel and the lower outer panel is inclined to either the upper front of the vehicle or the lower rear of the vehicle. The sill inner panel is provided with a support member that receives a load from the webbing of the seat belt device,
4. The vehicle body according to claim 2, wherein the high rigidity direction of the portion where the support member is installed in the sill inner panel is set toward a load input direction from the webbing. Skeleton structure.

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