JPH0225688Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to impact beams, and in particular,
This invention relates to improvements to impact beams that are installed inside side doors of automobiles to reinforce their strength.

[Prior art]

A conventional impact beam, for example, as shown in FIGS. 5 and 6, an impact beam 1 installed inside a side door of an automobile includes a central corrugated plate portion 2 having a plurality of continuous corrugated cross sections, and It has a flat plate-shaped welding surface part 3 formed at both ends of the corrugated plate part 2 in the longitudinal direction, and the width thereof is uniform in the longitudinal direction. Further, the wave height of the waveform in the cross section of the central corrugated plate portion 2 is highest at the longitudinal center portion, and gradually lowers toward both longitudinal ends thereof, and this is continuous with the flat welding surface portion 3. Therefore, there is a problem in that the section modulus of the central corrugated plate portion 2 changes rapidly from the center toward both ends in the longitudinal direction, resulting in non-uniform strength. Furthermore, as described above, although the wave height of the central corrugated sheet portion 2 is highest at the center and lower at both ends, the width of the central corrugated sheet portion 2 is uniform in the longitudinal direction. The plate material used as the material has the widest development width at the center of the central corrugated plate part 2 and gradually narrows toward both ends, so there is a problem that a lot of material is wasted when cutting the material and the yield is low. .

[Purpose of invention]

This invention was made in view of the above-mentioned conventional problems, and provides an impact beam in which the section modulus of the central corrugated plate portion changes gradually from the center in the longitudinal direction toward both ends. The purpose is to Another object of this invention is to provide an impact beam that can significantly improve material yield.

[Structure of the idea]

This invention provides an impact beam having a central corrugated plate portion having a plurality of continuous wave shapes in cross section, and flat plate-shaped welded surface portions formed at both longitudinal ends of the central corrugated plate portion. By forming the width and wave height of the waveform in the cross section of the central corrugated plate part to be narrowest and highest at the longitudinal center part and gradually widen and lower from the longitudinal center part to both ends, the central corrugated plate part The section modulus gradually changes from the center in the longitudinal direction to both ends,
This aims to achieve the above objectives. In addition, this invention has the development width of the central corrugated plate portion,
By making the material uniform in the longitudinal direction, the yield of the material is greatly improved and the above object is achieved.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, this embodiment includes a central corrugated plate section 12 having a plurality of continuous wave-shaped cross sections, and flat plates formed at both longitudinal ends of this central corrugated plate section 12. In the impact beam 10 having a welded surface portion 14 having a shape, the width of the center corrugated plate portion 12 and the wave height of the waveform in the cross section are narrowest and highest at the longitudinal center portion 12A, and Gradually widening from part 12A to both ends,
Moreover, it is formed low. Further, the developed width of the central corrugated plate portion 12 is uniform in its longitudinal direction. Reference numeral 16 in FIG. 1 indicates a spot welding point. The change in the longitudinal width of the central corrugated plate portion 12 is as follows:
As shown in FIG. 1, the longitudinal center portion 12A
It is made to form a gentle curve from the end toward both ends in the longitudinal direction. Therefore, in this embodiment, the central corrugated plate portion 1
2, the width of the portion with high wave height in the longitudinal center portion 12A is narrow, and conversely, the width of the portion with low wave height at both ends of the longitudinal direction is wide. Therefore, the section modulus of the central corrugated plate portion 12 is Direction center part 12A
Because the impact beam gradually changes from
The overall strength can be improved compared to the above. Further, since the developed width of the central corrugated plate portion 12 is made uniform in the longitudinal direction, the impact beam 10 can be formed from a rectangular plate material, and therefore, as shown in FIGS. 5 and 6. Compared to the conventional impact beam 1 as shown, the material yield can be significantly improved. Moreover, as mentioned above, since the central corrugated plate part 12 has a narrow width at its longitudinal center part 12A and a wide width at both ends, compared to the conventional impact beam 1 when the weight is the same, Welding surfaces 14 at both ends
The width of the door can be increased, and therefore the strength of attachment to a side door etc. can be increased, and
The degree of freedom in mounting position is also increased. Next, a second embodiment of the present invention shown in FIG. 4 will be described. This second embodiment has a shape in which the width of the central corrugated plate portion 12 in the first embodiment is narrowed from both sides in the width direction at the central portion 12A in the longitudinal direction. The shape is narrowed only from the end side, and the other end in the width direction is straight. This second embodiment can be adapted to the mounting space of a member to which the impact beam 12 is mounted or the position of a portion requiring reinforcement. Note that in the above embodiment, the developed width of the central corrugated plate portion 12 is made uniform in the longitudinal direction, but even if the developed width of the central corrugated plate portion 12 is not strictly uniform in the longitudinal direction, As long as the wave height at the longitudinal center portion 12A of the corrugated plate portion 12 is higher than at both ends, and the width can be formed narrower than at both ends, the developed width may vary slightly in the longitudinal direction. However, if the development width is made uniform in the longitudinal direction,
The yield is the highest because the raw material can be taken from rectangular plates. It should be noted that, although the above-mentioned embodiments relate to impact beams for automobiles, the present invention is not limited thereto, and may be applied to other vehicles other than automobiles, aircraft, etc.

[Effect of the idea]

Since the present invention is configured as described above, the section modulus of the central corrugated plate portion can be configured to change gently from the center in the longitudinal direction to both ends, and therefore the strength can be increased. With,
It has the excellent effect of significantly improving material yield.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the impact beam according to the present invention, FIGS. 2 and 3 are enlarged sectional views taken along lines - and - in FIG. FIG. 5 is a front view similar to FIG. 1 showing the embodiment, FIG. 5 is a front view showing a conventional impact beam, and FIG. 6 is an enlarged sectional view taken along the line - in FIG. DESCRIPTION OF SYMBOLS 10... Impact beam, 12... Center corrugated plate part, 12A... Longitudinal center part, 14... Welding surface part.

Claims (1)

[Claims for Utility Model Registration] (1) A central corrugated plate portion having a plurality of continuous wave-shaped cross sections, and flat welded surface portions formed at both ends of the central corrugated plate portion in the longitudinal direction. In the impact beam, the width and the wave height of the waveform in the cross section of the central corrugated plate part are narrowest and highest at the center in the longitudinal direction, and gradually widen and lower from the center in the longitudinal direction to both ends. An impact beam featuring (2) The impact beam according to claim 1, wherein the central corrugated plate portion has a developed width that is uniform in the longitudinal direction.