JPH04297376A - Body skeletal member - Google Patents

Abstract

PURPOSE:To improve an energy absorbing characteristic by installing a jointing flange in the cross direction edge of a light-metal long plate, joining this jointing flange and setting it down to a closed section construction, while installing a high rigid member in this jointing flange at a specified interval in the longitudinal direction, and forming a body skeletal member. CONSTITUTION:A vertical wall part 3 and symmetrical wall parts 5, 7 are formed by a light-metal long plate machine for aluminum or the like, forming a side member 1 in a closed section structure with an angular part 9. In addition, a jointing flange 11 is installed in an edge of the vertical wall part 3, and further a projecting piece 13 jutting out in the plate thickness direction of the flange 11 is installed at a specified interval in the longitudinal direction. Likewise, a jointing flange 15 is installed in a lower end of the left wall part 5, installing a projecting piece 17 there. In succession, these projecting pieces 13, 17 are joined together with a bonding agent, and both these joint flanges 11, 15 are joined by means of spot welding. With this constitution, two high rigid parts 20 and a deformed part 21 lying between these rigid parts 20 and 20 at a specified interval in the longitudinal direction of both these jointing flanges 11, 15.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a vehicle body frame member that can reduce the weight of a vehicle body and increase the amount of energy absorbed in the event of a vehicle collision.

0002

2. Description of the Related Art An example of a conventional vehicle body frame member is a front side member 101 shown in FIG. 11.

This side member 101 is made of steel, and for example, as shown in FIG.
09, they are joined by spot welding 111 at predetermined intervals and have a closed cross-sectional structure. When a collision load is input from the bumper side to the side member 101 during a frontal collision of the vehicle, the side member 101 absorbs the collision energy through crushing deformation or the like.

0004

[Problems to be Solved by the Invention] In recent years, there has been a demand for lighter vehicle bodies in order to reduce fuel consumption and improve vehicle performance.In order to meet these demands, side members 101 have been developed.
Research is underway to form the frame members of aluminum and other light metals from light metals such as aluminum, and has already been put into practical use.

In this case, the strength of the material such as aluminum is increased by heat treatment, but if the composition of the material changes due to spot welding and returns to the state before treatment, there is a possibility that the strength of the welded part will partially decrease. be. Furthermore, when an axial compressive load is input to the side member 101 due to a frontal collision or the like, and the side member 101 is crushed and deformed into a bellows shape as shown in FIG. However, as the crushing deformation progresses, loads fa2 and fb2 are generated in the direction of peeling off both joining flanges 107 and 109 as shown in FIG. 13, so the spot weld 111, which is weak against the load in the peeling direction, may peel off as shown in the figure. There is sex. Therefore, conventionally both joint flanges 107, 109
increase the number of spot welding points, or
3,105 must be thickened to set a predetermined amount of energy absorption.

On the other hand, increasing the number of spot welds 111 on both joining flanges 107, 109 will make the welding work extremely complicated, and if the thickness of the members 103, 105 is increased, there is a limit to weight reduction, and aluminum There is a risk that the advantages of molding with light metals such as

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle body frame member that is molded from a light metal plate such as aluminum and can improve energy absorption characteristics without increasing the plate thickness.

[0008]

[Means for Solving the Problems] A vehicle body frame member having a closed cross-section structure, which is formed by providing a joining flange at the widthwise edge of a long plate made of light metal and joining the joining flange by spot welding and adhesive bonding. , characterized in that high-rigidity portions are provided at predetermined intervals in the longitudinal direction on both of the joined flanges.

[0009]

[Operation] The vehicle body frame member is crushed and deformed due to the input load in the axial compression direction. At this time, in both joining flanges, deformation is promoted between high-rigidity parts provided at predetermined intervals in the longitudinal direction, and deformation is suppressed in the high-rigidity parts. In the highly rigid parts of both joining flanges, the load in the peeling direction input to the spot welded part is significantly reduced.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the front end side of a side member 1 as a vehicle body frame member according to an embodiment of the present invention.

[0012] The side member 1 according to this embodiment is composed of an upper and lower wall portion 3 and left and right wall portions 5 and 7 made of elongated plates made of light metal such as aluminum, and has a closed cross-sectional structure having corner portions 9. .

The upper and lower wall portions 3 and the right wall portion 7 are formed of a channel-shaped projecting plate member 1A, and a joining flange 11 is provided at the end of the upper and lower wall portions 3. Furthermore, protruding pieces 13 protruding in the thickness direction of the joining flange 11 are provided at predetermined intervals in the longitudinal direction.

The left wall portion 5 is formed of a flat plate member 1B,
Joint flanges 15 are provided at the upper and lower ends. Furthermore, protruding pieces 17 protruding in the thickness direction of the joining flange 15 are provided at predetermined intervals in the longitudinal direction.

[0015] Then, the joining flange 11 of the veneer member 1A
The protruding piece 13, the joining flange 15 of the flat plate member, and the protruding piece 17 are joined with an adhesive, and the joining flanges 11, 15 are joined by spot welding 19 at the positions of the protruding pieces 13, 17.

Therefore, the side member 1 according to this embodiment
Both joining flanges 11, 15 are connected by protruding pieces 13, 17.
It has a structure in which high rigidity parts 20 are provided at predetermined intervals in the longitudinal direction, and the space between the high rigidity parts 20 becomes a deformable part 21.

Next, the operation of the above embodiment will be explained.

When a collision load is input to the side member 1 from the front bumper side (not shown) due to a frontal collision of a vehicle, crushing deformation starts from the deformed part 21 due to the existence of the high-rigidity part 20, and the left and right walls are damaged as shown in FIG. The parts 5, 7, etc. are crushed and deformed into a bellows shape. Due to this crushing deformation, both joint flanges 11
, 15 bend and deform as one unit while being bonded with adhesive when the collision load is small, thereby sufficiently absorbing the load. As the collision load increases, the deformation of the deformed portion 21 further progresses, and shear loads fa1, fb1 and peeling loads fa2, fb are generated in the deformed portion 21 between both joining flanges 11 and 15.
2 comes into play. The adhesive that joins both joining flanges 11 and 15 is strong against shear loads fa1 and fb1 and contributes to load absorption. Further, even when a gap is created between the joining flanges 11 and 15 due to the peeling loads fa2 and fb2, the adhesive resists the loads fa2 and fb2 and contributes to load absorption. Furthermore, the joint flange 11 due to loads fa2 and fb2
, 15 extends to the high-rigidity part 20, but the adhesive between the protruding pieces 13 and 17 receives it as a shear load, and the peeling force input to both joining flanges 11 and 15 and the spot weld 19 is significantly reduced. Therefore, the crushing deformation further progresses in the deformed part 21 where the adhesive has peeled off, and in the high-rigidity part 20 deformation in the peeling direction is prevented by the spot weld 19 and the adhesive, and the peeling deformation occurs in the deformed part 21.
1 to the high-rigidity portion 20, and stable load absorption is achieved. Moreover, since the crushing deformation location can be identified, it becomes easy to set the energy absorbed by the side member 1. Furthermore, the number of spot welds 19 can be reduced, making the work easier.

FIG. 3 shows another embodiment of the invention. Components that are the same as those of the side member 1 shown in FIG. 1 are given the same reference numerals, and redundant explanations will be omitted.

In this embodiment, both joining flanges 11, 15
A horizontal bead 23 is formed at a predetermined location in the longitudinal direction on the widthwise edge of the
, 25 are provided. These horizontal beads 23, 25 are shown in FIG.
As shown in FIG. 1, both joining flanges 11 and 15 are bent obliquely in the plate thickness direction, and the protruding piece 13 in the embodiment of FIG.
, 17. Further, on both longitudinal sides of the horizontal beads 23, 25, the joining flanges 11, 15 have vertical beads 27 as shown in FIG.
, 29 are provided, and these vertical beads 27, 29 serve as deformation accelerating portions. Therefore, this embodiment also has a configuration including a high rigidity section 20 and a deformable section 21.

FIG. 6 shows the operating state of this embodiment. Basically, the highly rigid section 20 having the horizontal beads 23 and 25 and the deformable section 21 therebetween function in substantially the same manner as the embodiment shown in FIG. Further, in this embodiment, the vertical beads 27, 29
serves as a deformation accelerating portion, and peeling deformation of both joining flanges 11 and 15 is reliably prevented and does not extend to the spot weld 19, so that peeling of the spot weld is reliably prevented.

Therefore, according to this embodiment, in addition to achieving the same effects as those of the previous embodiment, deformation of the spot welded portion in the peeling direction can be more reliably prevented, and the energy absorption performance is more stabilized. be able to.

FIGS. 7 to 10 show still other embodiments of the present invention. Components that are the same as those of the side member 1 shown in FIGS. 1 and 2 are given the same reference numerals, and redundant explanations will be omitted.

[0024] This embodiment is a modification of the embodiment shown in Fig. 1, and is designed to eliminate the gap between the joint flanges that occurs when buckling is produced by forming a long light metal plate material, especially a member with a convex cross section. .

As shown in FIG. 14, in a veneer member 103 such as a general skeleton member, the end 107a of the joining flange 107 is open due to buckling due to molding, and when this is forcefully welded under pressure by spot welding, the end 107a of the joint flange 107 is opened. Although both the joining flanges 107 and 109 are firmly fixed in some parts, the end 107a of the joining flange 107 is in an open state between the spot welds 111, and the effect of the adhesive cannot be expected.

Therefore, as shown in FIGS. 7 and 8, a shape-retaining piece 31 extending between the protruding pieces 13 is provided at the edge of the joining flange 11 of the projecting plate member 1A.

To explain the joining state of the veneer member 1A and the flat plate member 1B formed in this way, as shown in FIGS. Pressure is applied to the joint flange 15 at the spot 33 to perform spot welding. Then, when spot welding is performed one after another at predetermined intervals in the longitudinal direction, the joining flange 11 is bonded to the shape retaining piece 31 between the spot welds 19.
As a result, it is forcefully and closely joined to the joining flange 15 while maintaining its shape. Therefore, both joining flanges 11 and 15 are reliably joined by the adhesive.

In this example, the load absorption effect is as shown in FIG.
This is carried out in substantially the same manner as in the embodiment.

Note that the present invention is not limited to the above embodiments. For example, it can also be applied to rear side members or other vehicle body frame members. Further, the skeleton member is not limited to a structure in which two members are joined together to have a closed cross-sectional structure, but may also be a bag-shaped cross-sectional structure.

[0030]

[Effects of the Invention] As is clear from the above explanation, according to the structure of the present invention, crushing deformation in the high-rigidity portions is suppressed, and since crushing deformation occurs between the high-rigidity portions, there is no spot in the high-rigidity portions. Welding and adhesion can securely hold both joining flanges together, and can perform sufficient energy absorption and stabilize energy absorption performance. In addition, the crushing deformation state can be specified, and the absorption energy can be easily set.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the action.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a sectional view taken along line BB in FIG. 3;

FIG. 6 is an explanatory diagram of the action.

FIG. 7 is a perspective view of another embodiment.

8 is a perspective view with a part of the projecting plate member in FIG. 7 omitted; FIG.

FIG. 9 is an action explanatory diagram.

FIG. 10 is an explanatory diagram of the action.

FIG. 11 is a perspective view of the front part of the vehicle body.

FIG. 12 is a perspective view of a conventional side member.

FIG. 13 is an action explanatory diagram.

FIG. 14 is an explanatory diagram of the action.

[Explanation of symbols]

1 Side member (vehicle body frame member) 11, 15
Joint flange 20 High rigidity part

Claims (1)

[Claims] Claim 1: A vehicle body frame member having a closed cross-section structure formed by providing a joining flange at the widthwise end edge of a long light metal plate material and joining the joining flange by spot welding and adhesion, wherein the joined A vehicle body frame member characterized in that high-rigidity portions are provided at predetermined intervals in the longitudinal direction on both joining flanges.