KR930003585B1 - Steering wheel core - Google Patents

Abstract

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Description

Steering wheel core

1 is a plan view of a steering wheel core showing one embodiment of the present invention.

2 is a graph showing the relationship between the displacement and the load during the static load test between the example and the comparative example.

3 is a plan view of a wheel to be swiveled in a steering showing another embodiment.

4 shows a test piece at the time of a tensile test.

* Explanation of symbols for main parts of the drawings

1: steering wheel core 2: boss

3: ring portion core 4: spoke portion core

The present invention relates to a steering wheel core wherein at least the spoke core between the boss and the ring core is formed by diecast molding of an aluminum alloy.

Background Art Conventionally, in order to simplify the steering wheel and facilitate the manufacture, it has been proposed to form the steering wheel core by diecast molding of an aluminum alloy.

And when the spoke part core which connects a boss and a ring part core is to be formed by die-casting of aluminum alloy, it is preferable to use the kind of elongation which is good in the required performance of a steering wheel core.

Therefore, it is conceivable to use ADC6 having good elongation among six kinds of die-cast aluminum alloys (ADC1, ADC3, ADC5, ADC6, ADC10 and ADC12) shown in the conventional JIS.

However, using this ADC6 was not satisfactory enough.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object thereof is to provide a steering wheel core that satisfies the required performance by forming at least the spoke portion core between the boss and the ring portion core with a novel die-cast alloy.

The steering wheel core which concerns on this invention is a steering wheel core in which the spoke part core between at least a boss and a ring part core is formed by die casting of an aluminum alloy,

Mg

2.49중량%1.5

Mg

2.49 wt%

Fe

1.0중량%0.4

Fe

1.0 wt%

Mn

0.6중량%0.4

Mn

0.6 wt%

Si

0.4중량%0.2

Si

0.4 wt%

And the composition described above with Al containing inevitable impurities, to achieve the above object.

In the steering wheel core according to the present invention, in the die-cast aluminum alloy forming the spoke core, Mg, Fe, Mn and Si are added in a predetermined range, so that the elongation is good, and the conventional ADC6 is used. In comparison, the required performance of the steering wheel core can be satisfied.

The reason for addition of each element is as follows in balance with each element.

Mg is added to improve the mechanical strength (tensile strength, etc.). However, if it exceeds 2.49% by weight, the ductility is lowered, less than 1.5% by weight, and the mechanical strength as the steering wheel core cannot be satisfied.

Fe is added to improve the releasability to prevent adhesion to the mold. However, when it exceeds 1.0 weight%, ductility will fall, and when it is less than 0.4 weight%, mold release property will worsen.

Mn is added to remove the adverse effect of the formation of a needle-like compound by Fe incorporation. However, if the content exceeds 0.6% by weight, the mechanical strength decreases, making it unsuitable for the steering wheel core. If the content is less than 0.4% by weight, the adverse effect of Fe cannot be eliminated.

Si is added to improve fluidity. However, when it exceeds 0.4 weight%, ductility will fall, and when it is less than 0.2 weight%, fluidity will worsen.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the steering wheel core 1 of the embodiment, the four spoke part cores 4 which connect the forced boss 2 and the ring part core 3 made of steel pipes are made of die-cast aluminum alloy.

Each spoke part core 4 has a cross-sectional inverted U shape with concave grooves 4a formed at its bottom, and is integrated as an annular boss connection part 5 surrounding the outer periphery of the boss 2 on the boss 2 side. Moreover, in the ring part core 3 side, the ring connection part 4b of cyclic | annular cross section surrounding the circumferential surface of the ring part core 3 is provided, respectively.

And of course, this steering wheel core 1 sets the boss | hub 2 and the ring part core 3 in the metal mold | die of a predetermined die-casting machine, and forms the spoke part core 4 by the die-cast molding method.

Each element content of the spoke part core 4 of an Example is as following 1st table | surface. In addition, the lower part of a table | surface is content of each element in the case of the conventional ADC6 as a comparative example.

TABLE 1

The result of the static load test of the steering wheel coil 1 of an Example and the steering wheel core (comparative example) which formed the part of the spoke part core of the Example with the die-cast aluminum alloy of ADC6 is shown in the graph figure of FIG. do. In addition, this static load test lowers the front side 3A of the ring portion core 3 and lowers the rear side 3B from a state where the surface of the ring portion core 3 as shown in FIG. 1 is horizontal. The boss 2 is fixed in a state in which the axial direction of the boss 2 is inclined 30 degrees forward from the vertical direction so as to raise it. And the relationship between the displacement amount and the load of the ring part core back side 3B below when the load is applied to the back side 3B of the ring part core 3 in the perpendicular direction is investigated.

As is apparent from this graph, in the comparative example, the amount of displacement of the ring core is small, and in the example, the spoke core is smoothly plastically deformed even when the ring core is displaced by about 80 mm. It can be seen that the ones of the examples are suitable as compared to the above.

In the steering wheel core 1 of the embodiment, the moldability was better than that of the ADC6, and the deformation strength (elongation characteristic) was also improved.

In addition, although the steering wheel core 1 of the Example showed that only the spoke part core 4 was formed by die-casting of the aluminum alloy, as shown in FIG. 3, not only the spoke part core 14 but also the ring part core are shown. Also in (13), you may form from die-casting of a predetermined | prescribed aluminum alloy. In this connection, the steering wheel core 11 is provided with the spoke part core 14 and the ring part core 13 together with concave grooves 14a and 13a at the bottom thereof to have an inverted U-shaped cross section.

Furthermore, a tensile test is carried out on the test pieces in which the elements and the contents of the examples are different from each other, and the results are shown in the second table. As shown in FIG. 4, the shape of the test piece was 50 mm for the gauge length L, 60 mm for the length P of the parallel part, 8 mm for the diameter D, 20 mm for the shoulder radius R, and 20 mm for both ends. Is 16mm and the total length is 140mm.

TABLE 2

As can be seen from the above table, in specimens 1, 2 and 3 in which the content of each element is in the scope of the present invention, ADC6 is reduced by about 1 to 2% in tensile strength, compared to specimen 4, but in elongation 3 It improves to about 50 to 50, and when content of each element falls within the scope of this invention, the required performance of a steering wheel core is fully satisfied.

Claims (1)

At least the spoke portion core between the boss and the ring portion core is a steering wheel core formed by diecast molding of an aluminum alloy, wherein the aluminum alloy is 1.5

Mg

2.49 wt% 0.4

Fe

1.0 wt% 0.4

Mn

0.6 wt% 0.2

Si

0.4 wt% And Al comprising inevitable impurities.

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