JPH05305876A - Reinfrocing structure of frame - Google Patents

Abstract

PURPOSE:To secure a frame reinforcing structure that is able to improve the extent of rigidity even to a sectional break and also to make flexural rigidity improvable. CONSTITUTION:A frame 10 is being formed into a long-sized closed sectional structure almost made up in a rectangular form, and in four corner parts 10A, 10B, 10C and 10D, there is provided each of wavy parts 12 repeating the same jogs along the longitudinal direction of the frame 10. As for each of the wavy parts 12, each top part 12A of projections accords with each of the corner parts 10A, 10B, 10C and 10D of the frame 10, and its width becomes most narrowed. Likewise, each bottom part 12B of recesses of the wavy parts 12 is situated in the more inner part than each of these corner parts 10A, 10B, 10C and 10D of the frame 10, and its width becomes most widened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for a frame used in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, in a frame used in an automobile or the like, a structure is known in which a bent portion which is apt to be subjected to a concentrated stress is reinforced.
No. 4 is disclosed.

As shown in FIG. 8, in this frame reinforcing structure, a bent portion 72A of a side frame 72 is formed by using a corrugated steel plate 70 formed by corrugating a steel plate, and the bent portion of the side frame 72 is formed. 72A is reinforced.

[0004]

However, in this frame reinforcing structure, the bent portion 72A of the side frame 72 is formed in the vertical direction of the corrugated steel sheet 70 (the direction along the concave and convex portions of the wave). Therefore, the rigidity of the side frame 72 in the axial compression direction is improved, but as shown by the imaginary line in FIG. 9, the side frame 7 having a rectangular shape is used.
The structure has low rigidity against the so-called collapse of the cross section, that is, the collapse of the second closed cross section 74.

In view of the above facts, it is an object of the present invention to obtain a frame reinforcing structure capable of improving rigidity even with respect to cross-section collapse and improving bending rigidity.

[0006]

In the reinforcing structure for a frame according to claim 1 of the present invention, in a long frame having a rectangular closed cross section, a corrugated portion is formed in a corner portion in which unevenness is repeated along the longitudinal direction. The feature is that it is provided.

[0007]

In the reinforcing structure for a frame according to claim 1 of the present invention, since the corrugated portions provided at the corners of the frame and having the unevenness along the longitudinal direction serve as a beam, the collapse of the cross section of the frame is prevented. As a result, the bending rigidity of the frame is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the frame reinforcing structure of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the frame 10 of this embodiment has a closed cross-sectional structure having a substantially rectangular cross section, and is used as a body frame member such as a side member or a cross member.

The four corners 10A, 1 of this frame 10
Each of 0B, 10C, and 10D is provided with a wavy portion 12 that repeats unevenness along the longitudinal direction of the frame 10.

As shown in FIG. 2, the shape of the wavy portion 12 as viewed from the longitudinal direction of the frame 10 is such that the top portion 12A of the convex portion coincides with the corner portions 10A, 10B, 10C, 10D of the frame 10, and the width thereof is wide. S is the narrowest. On the other hand, the bottom portion 12B of the concave portion of the wavy portion 12 has the corner portion 10 of the frame 10.
Located inside A, 10B, 10C, and 10D,
The width S is the widest. Also, the top 12A and the bottom 1
2B, the width of the wavy portion 12 gradually changes.

As shown in FIG. 3, the corrugated portion 1 provided at the corner portions 10A, 10B, 10C, 10D of the frame 10
2 has a triangular wave-shaped cross section along the longitudinal direction of the frame 10, and each corner 10A, 10B, 10C,
The wavelength L, the amplitude H, and the phase of the wavy portion 12 provided in 10D are the same.

Next, the operation of this embodiment will be described. In the frame reinforcing structure of this embodiment, the corner portion 10 of the frame 10 is
The corrugated portions 12, which are provided in A, 10B, 10C, and 10D and which have unevenness along the longitudinal direction, serve as beams.
Therefore, the collapse of the cross section as shown by the imaginary line in FIG. 2 is prevented, and the bending rigidity of the frame 10 is improved. Further, since it is not necessary to provide a bulkhead or the like for preventing the collapse of the cross section, cost reduction and weight reduction can be achieved.

Next, the second reinforcing structure of the frame of the present invention
An embodiment will be described with reference to FIGS.

As shown in FIG. 4, the four corner portions 20A, 20B, 20C and 20D of the frame 20 are provided with wavy portions 22 which repeat irregularities along the longitudinal direction of the frame 20, respectively.

As shown in FIG. 5, the shape of the wavy portion 22 as viewed from the longitudinal direction of the frame 20 is such that the top portion 22A of the convex portion coincides with the corner portions 20A, 20B, 20C and 20D of the frame 20, and the width thereof is wide. S is the narrowest. On the other hand, the bottom portion 22B of the concave portion of the wavy portion 22 has an arc shape, and
It is located inside the zero corners 20A, 20B, 20C, 20D and has the widest width S. Also, the top 2
The width of the corrugated portion 22 gradually changes between 2A and the bottom portion 22B.

Therefore, in this embodiment, the same effect as that of the first embodiment can be obtained. In each of the above-described embodiments, the vertical wall portion and the horizontal wall portion of the frames 10 and 20 are formed in a flat plate shape to prevent the rigidity from decreasing in the axial compression direction. However, instead of this, it is shown in FIG. As described above, the vertical wall portions 20E and 20F and the horizontal wall portions 20G and 20H of the frame 20 may be provided with the corrugated portion 24 in which irregularities are repeated along the longitudinal direction.
Further, in each of the above embodiments, the cross-sectional shape of the wavy portions 12, 22 along the longitudinal direction of the frames 10, 20 is the triangular wave shape shown in FIG. 3, but instead of this, as shown in FIG. The cross-sectional shape of the portions 12 and 22 along the longitudinal direction of the frames 10 and 20 may be another wave shape such as a sine wave. Further, the wavelength and the amplitude of the wavy portions 12 and 22 are not constant and may be changed. 4 in one frame 10, 20
The wavelengths and amplitudes of the wavy portions 12 and 22 provided at one corner may be different, or the phases may be shifted.

The frames 10 and 20 of each of the above embodiments are
In the case of manufacturing, for example, a frame is divided into upper and lower parts, that is, a pair of members having a U-shaped cross section is manufactured by pressing or the like, and then these members are butted to each other so as to have a rectangular cross section. It is manufactured by a method such as bonding.

[0019]

The reinforcing structure of the frame of the present invention is a long frame having a rectangular closed cross section, and is provided with wavy portions that repeat irregularities along the longitudinal direction at the corners, so that the cross section collapses. Also, it has an excellent effect that the rigidity can be increased and the bending rigidity can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a frame reinforcing structure according to a first embodiment of the present invention.

2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view showing a frame reinforcing structure according to a second embodiment of the present invention.

5 is a sectional view taken along line 5-5 of FIG.

FIG. 6 is a perspective view showing a reinforcing structure of a frame according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view corresponding to FIG. 3, showing a frame reinforcing structure according to another embodiment of the present invention.

FIG. 8 is a perspective view showing a frame reinforcing structure according to a conventional example.

9 is a sectional view taken along line 9-9 of FIG.

[Explanation of symbols]

 10 frames 10A corners 10B corners 10A corners 10B corners 12 wavy parts 20 frames 20A corners 20B corners 20A corners 20B corners 22 wavy parts

Claims (1)

[Claims] 1. A reinforcing structure for a frame, characterized in that a long frame having a rectangular closed cross section is provided with a corrugated portion which repeats unevenness along a longitudinal direction at a corner portion.