JPH09202263A - Frame for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items in number while high strength is being secured. SOLUTION: In an area where a cross sectional shape is changed in the longer direction of a body high in height, the frame of which is formed out of a definite cross sectional member such as an extruded form made of a light alloy and the like, and in a part of the extruded form where there exists each step by the thickness of sheet in both its surfaces between the surfaces faced to each other, each cut-out 5 provided for the stepped part in the longer direction and each cut-out 8 in a wedge shape provided for the end of aforesaid each cut-out 5 in the horizontal direction, are compressed in the direction normal to the longer direction of each cut-out, and portions where there exists each step by the thickness of a sheet, are piled up so as to be formed into a tapered shape in the longer direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body in which the skeleton of the vehicle body is made of a constant cross-section member such as a light alloy extruded material (FIG. 4)
The present invention relates to a vehicle body component which is used for components such as the center pillar 17 and the hood ridge 18 and whose sectional shape changes in the longitudinal direction.

[0002]

2. Description of the Related Art As a conventional automobile frame, for example, there is one shown in FIG. (JP-A-6-5037
No. 77). The center pillar comprises a first extruded material 1 and a second extruded material 2, which are arranged one behind the other in the vehicle longitudinal direction, and the first extruded material 1 is cut over most of its length. The cut surface is in close contact with the second extruded material 2, and the structure is such that the second extruded material 2 is bonded at the close contact portion.

[0003]

However, in such a conventional automobile frame, one extruded material 2 is welded to the other extruded material 1 cut in the longitudinal direction, and the plate material 3 is placed in the lower portion. By having a structure to weld, the thickness of the plate in the longitudinal direction is constant due to the use of extruded material, and the part where parts such as seat belt anchors are mounted has a closed cross section throughout the manufacturing process. Reinforcing material is required on the inner wall of extruded material at locations where strong input occurs, such as seatbelt anchors, etc., so it is difficult to attach nuts to the inner wall of extruded material to attach parts such as seatbelt anchors. Therefore, special parts 4 as shown in FIG.
There were problems such as having to use 4 '. Further, in a structure such as a steel monocoque structure, which uses a large number of pressed plate materials, a reinforcing material is necessary in a portion where the size of the cross section is reduced in order to input from the side.

[0004]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to such a conventional problem, and a notch is formed in one extruded material, and nuts are attached to the inner wall of the cross section at that time. However, it is an object of the present invention to solve the above problems by compressing the extruded material in the direction perpendicular to the notch to form a taper shape in the longitudinal direction, and by forming a structure in which the plates overlap at the taper portion.

That is, in the automobile frame according to the first aspect of the present invention, the skeleton of the vehicle body is constituted by a constant cross-section member such as a light alloy extruded material, and the portions of which the cross-sectional shape changes in the longitudinal direction of the vehicle body are respectively formed on opposing surfaces. Step difference by the plate thickness (6)
A notch (5) provided in the longitudinal direction of the step, and a wedge-shaped notch (8) provided in the horizontal direction at the end of the notch in a part of the extruded material with By compressing in a direction perpendicular to the notch and overlapping the portions having a step by the plate thickness, a taper shape was formed in the longitudinal direction. In the automobile frame according to claim 1, welding may be applied to the overlapping portion (claim 2). Further, in the automobile frame according to claim 1, the tapered tip position (12) of the component may be arbitrarily set by controlling the wedge shape (8) of the notch in the horizontal direction (claim 3). . Further, in the automobile frame according to claim 1, the notch in the longitudinal direction is 4
By providing the portions (5 ′), the dimensions in the width direction and the depth direction may be changed to form a three-dimensional taper shape (claim 4).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention.
First, the configuration will be described. The automobile center pillar 9 has a step 6 corresponding to each plate thickness on the opposing surfaces (a).
In a part of the extruded material 70 having the space 7 shown in FIG. 2, a notch 5 provided in the longitudinal direction of the step 6 as shown in FIG. 1B and an end portion of the notch 5 provided in the horizontal direction. Forming a wedge-shaped notch 8 and then compressing it in the direction perpendicular to the longitudinal notch 5 as shown by the arrow in FIG. (B), and as shown in FIGS. It is tapered in the longitudinal direction by overlapping the portions having the steps. The method of providing the notches 5 and 8 is not particularly limited, and for example, sawing, pressing, laser processing, etc. can be applied.

Further, a portion 11 in which the plates of the portion having a small cross section are doubled is welded at a welding portion 10, and this portion 11
The seatbelt anchor 19 is attached to the seatbelt, holes (not shown) are provided in the portions that are not tapered, and the seatbelt retractor 20 is attached.

Next, the operation will be described. By compressing in the direction perpendicular to the notch 5 in the longitudinal direction, the plates having steps by the plate thickness move while overlapping each other, so that the secondary processed product of the extruded material is tapered in the longitudinal direction (9). Is obtained.

As the size of the cross section decreases,
Since the area of the overlapping portion 11 of the plates becomes large, the plate thickness becomes substantially thick, and it is possible to obtain a frame member having substantially the same strength without using a reinforcing material.

Even when a bolt such as the seatbelt anchor 19 is subjected to both shearing force and tensile force, the plates are overlapped with each other, so that no reinforcing material is required.

Further, by providing the notch 5 in the longitudinal direction of the extruded material in the manufacturing process, it becomes easy to attach the parts such as the nuts 13 and 14 shown in FIG. 2 to the inner wall of the extruded material.

FIG. 3 shows another embodiment. This embodiment is applied to the hood ridge 18, and the cross-sectional shape 15 is obtained by offsetting four positions of the cross section of the extruded material by the plate thickness.
And the notch 5'in the longitudinal direction at the offset portion,
5'is provided, and a wedge-shaped notch is provided horizontally from each notch end 5 ', 5', and is sequentially compressed in the width direction and the depth direction to form a three-dimensionally tapered extrusion product 16
That is, the hood ridge 18 is obtained. By controlling the shape of the notch in the horizontal direction, the taper tip position 12 ′ can be arbitrarily changed.

[0013]

As described above, according to the present invention, by extruding the extruded material, a process of forming a notch and compressing the extruded material is performed. Since the structure is such that the overlapping area of the plates increases as the size of the cross section decreases, it is possible to maintain sufficient strength even in narrowed parts, and it is possible to apply it as a body part without using reinforcing materials. To be

The inventions according to claims 2 to 4 have the following effects in addition to the above-mentioned common effects. According to the second aspect of the invention, since the overlapping portion is welded, the strength is further improved. In the invention according to claim 3,
By controlling the wedge-shaped notch provided in the horizontal direction, the tip of the taper can be set arbitrarily,
The degree of freedom in design can be improved. In the invention according to claim 4, by providing four notches in the longitudinal direction, the dimensions in the width direction and the depth direction are changed, and a three-dimensionally tapered frame can be obtained, and the degree of freedom in design is improved. be able to.

[Brief description of drawings]

1A, 1B, and 1C are cross-sectional views showing a processing procedure of a first embodiment of the present invention, and FIG. 1B is a perspective view at the time when a notch of the embodiment is formed. It corresponds to FIG. (B)], and (C) is a perspective view of the embodiment after compression processing [corresponds to (c) in the figure].

FIG. 2 is a perspective view (a) and a sectional view (b) showing mounting of nuts according to the first embodiment.

3A, 3B and 3C are cross-sectional views showing a processing procedure of the second embodiment, and FIG. 3D is a perspective view thereof.

FIG. 4 is a perspective view of a space frame vehicle body made of aluminum extruded material.

FIG. 5 is a perspective view showing a conventional structure.

6A and 6B are perspective views showing a method of mounting nuts in a conventional structure, and FIG. 6C is a sectional view of the example of FIG. 6B.

[Explanation of symbols]

 70,70 'Extruded material 5,5' (longitudinal direction) Notch 6 Step 7 Space 8 (Wedge-shaped) Notch 9 Automobile center pillar (secondary extruded product) 10 Welded portion 11 (Double Part 12 Tapered tip position 13 Nut 14 Nut 15 Extruded cross-sectional shape 16 Extruded secondary processed product 17 Center pillar 18 Hood ridge 19 Seat belt anchor 20 Seat belt retractor

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[Procedure amendment]

[Submission date] May 13, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2 is an explanatory diagram showing a mounting mode of nuts according to the first embodiment.

Claims (4)

[Claims] 1. A portion (6) having a step thickness (6) corresponding to each plate thickness on opposing surfaces at a portion where the cross-sectional shape of the vehicle body is made of a constant cross-section member such as a light alloy extruded material and whose cross-sectional shape changes in the longitudinal direction. In a part of an extruded material, a notch (5) provided in the longitudinal direction of the step portion, a wedge-shaped notch (8) provided in the horizontal direction at the end of the notch portion, and A frame (9) for an automobile, characterized by being compressed in a direction perpendicular to the notch and overlapping portions having steps by a plate thickness to form a taper shape in the longitudinal direction. 2. The automobile frame according to claim 1, wherein the overlapping portion is welded. 3. The automobile frame according to claim 1, wherein the tapered tip position (12) of the component can be arbitrarily set by controlling the wedge shape (8) of the notch in the horizontal direction. Automobile frame. 4. The automobile frame according to claim 1, wherein by providing four notches in the longitudinal direction (5 ′), the dimensions in the width direction and the depth direction are changed to form a three-dimensional taper shape. Characteristic automobile frame.