JPS5850127Y2 - hollow torsion bar - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improved hollow torsion bar.

When a torsion moment is applied to a torsion bar, the internal stress is maximum in the outer skin layer and decreases linearly as it approaches the center.

Therefore, from the viewpoint of weight reduction, those formed in a hollow shape are known.

However, since conventional hollow torsion hones are formed from seamless tubes, the unit cost of materials is relatively high.

The present invention was developed under the above circumstances, and its purpose is to provide a lightweight and inexpensive hollow torsion bar.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

In FIG. 1, a main body 1 is formed into a cylindrical shape by spirally winding a material 2 made of band-shaped spring steel and having a roughly rectangular cross section.

The spring steel 2 is wound so that the lead angle is approximately 45 degrees, and is welded at mutually opposing portions 3 in the axial direction.

At the end of the 10 main bodies, there is a connecting part 4 whose cross section is approximately hexagonal.
, 4 are formed.

The inner diameter dl of the main body 1, the outer diameter d2, the effective length 9,
If WP is heavy and the effective length of d1 is the outer diameter of a solid torsion bar with the same spring characteristics as W, then the hollow ratio is n = d 1 /d 2, and d2/LP = d. /L L3P=L3/(l-n4) Since there is a relationship, Wp=W/(l+n 2), the main body 1 is lighter than a solid torsion bar with the same spring characteristics. .

Further, when a counterclockwise torsional moment b is applied to the main body 1 from the right end side as shown in FIG. 1, a tensile stress is generated in the direction of the arrow a, and a compressive stress is generated in a direction perpendicular to this.

However, in the illustrated example, since the material 2 is wound along the direction in which tensile stress is generated, no unreasonable force that would destroy the weld is applied to the mutually opposing portions 3.

Therefore, unlike conventional solid torsion bars, expensive seamless steel pipes (approximately 350 to 400 Y/Kg)
Welded steel pipes (
100 to 150 Y/Kg) can be used.

Since the above tensile stress is normally generated around a direction that is approximately 45 degrees to the axis) the main body 1 and the material 2
By appropriately setting the winding direction of the material 2 between approximately 30 degrees and 60 degrees according to each dimension of the material 2, sufficient strength can be guaranteed against the torsional moment in the predetermined direction as described above. .

In the second embodiment shown in FIG. 2, both end connecting portions 5,
5 is formed by upset processing so as to have an inner diameter substantially equal to that of the main body 1.

Further, in the third embodiment shown in FIG. 3, connecting portions 6, 6 are welded to both ends of the main body 1.

Furthermore, in the fourth embodiment shown in FIG.
A reinforcing member 8.8 is embedded in the connecting portions 7, 1 formed at both ends of the reinforcing member 8.

In other respects, each embodiment has substantially the same structure as the first embodiment shown in FIG.

In each of these second to fourth embodiments, substantially the same effects as in the first embodiment can be achieved.

Note that the present invention is not limited to the above embodiments.

That is, the connecting portion 4 is provided at the end and has a hexagonal cross section.
, 5, 6, 7, etc., any connecting portion having, for example, a rectangular cross section, other polygonal shapes, or non-circular shapes may be provided.

Further, when providing a circular connecting portion, for example, serration processing may be performed.

Furthermore, the cross-sectional shape of the strip material may be different from a rectangular shape.

Further, the main body may be formed by stacking a plurality of layers of materials 2 in the radial direction with mutually different winding directions.

As mentioned above, the present invention allows the strip material to have a lead angle of approximately 3.
Since it has a main body formed into a cylinder, tAJc, by winding it in a spiral shape of 0 degrees to 60 degrees and welding mutually opposing parts in the axial direction, it is more effective than a solid torsion bar with the same characteristics. It can be made lightweight, and the cost can be significantly reduced compared to those using seamless pipes.

Moreover, by attaching the strip material so that tensile stress is generated in the winding direction, it is possible to guarantee strength substantially equivalent to that of a seamless tube all around the circumference, and it has excellent practical effects. can.

[Brief explanation of drawings]

Fig. 1 is a cutaway front view showing an embodiment of the present invention;
3 and 4 are cutaway front views showing different embodiments of the present invention, respectively. 1...Main body, 2...Material, 3...
・Mutually facing parts.

Claims (1)

[Scope of utility model registration request] A hollow torsion bar having a main body formed into a cylindrical shape by winding a strip material in a spiral shape with a lead angle of approximately 30 degrees to 60 degrees and welding mutually opposing portions in the axial direction.