JPS5844054Y2 - steering wheel - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steering wheel for an automobile or the like, and relates to a structure of a welded portion between a rim core metal and a spoke core metal.

To connect the rim core metal and the spoke core metal of a conventional steering wheel, as shown in Figure 1, the end face of the spoke core metal is welded to the inner peripheral surface of the rim core metal a, and a T-shaped bracket c is fitted therein. , and it is also welded.

When using this method, the strength is satisfactory, but the end surface d of the bracket c is the core metal a.

Because it protrudes in an edge shape from the outer peripheral surface of b, the core metal a,
When molding a skin by casting polyurethane foam resin, etc. around the outer circumference of platen b, the flow of the resin flowing through the gap between the mold and core metals a and b is obstructed by the end face d of platen c, causing a vortex flow. There was a drawback that molding defects were likely to occur.

In addition, the joint of both core metals is placed within the formwork without welding,
There is also a method of forming a joint material at the joint using Gui-casting, but the disadvantage is that the Gui-casting joint material tends to crack and the joint strength is weak, and as with the Sagi method, the joint material obstructs the flow of resin when molding the outer skin. There is also a drawback.

In view of the above, the present invention has been developed by thinning the end surface of a cast pipe covering the welded portions of the rim core metal and the spoke core metal toward the outer peripheral surface of each core metal to form a part of the annular taper. The end face of the gold-coated pouring pipe is designed to prevent the resin from interfering with the flow of the resin during the next shell molding.

Next, the configuration of an embodiment of the present invention will be explained with reference to the attached FIGS. 2 and 3.

Reference numeral 1 denotes a steering wheel body, which is composed of a rim part 2 and a spoke part 3.A rim core metal 4 is embedded in the rim part 2, a spoke core metal 5 is embedded in the spoke parts 3, and the spoke cores are embedded in the inner periphery of the rim core metal 4. One end of the metal 5 is fixed by welding, and the spoke core metal 5
The other end is welded and fixed to the handle shaft attachment boss 6.

Furthermore, the welded portion γ of the rim cored metal 4 and the spoke cored metal 5 is covered with a T-shaped note branched in three directions along the outer periphery of the rim cored metal 4 and spoke cored metal 5 near this welded portion 7. A mold pipe 8 is integrally formed, and each core metal 4, which is the end face of this mold pipe 8,
An annular tapered portion 9 is formed by making the wall thinner toward the outer circumferential surface of the portion 5 .

The material of the casting pipe 8 is preferably an engineering resin such as polypropylene resin, ABS resin, polyethylene resin, or polyester resin.

Further, the core metals 4 and 5 are integrally covered with an outer skin made of cast soft synthetic resin such as polyurethane foam resin or vinyl chloride foam resin, thereby forming the rim portion 2 and the spoke portions 3.

Further, reference numeral 10 is a synthetic resin hub core that integrally covers the outer periphery of the boss 6 and a portion of the spoke core metal 5 near the boss 6.

If the same resin as the T-shaped casting pipe 8 is used for the hub core 10, both can be injection molded at the same time.

Next, the operation of this embodiment will be explained.

The rim portion 2 and spoke portions 3 are molded by inserting the core metals 4 and 5 covered with a previously welded casting pipe 8 into a mold, and then injecting a soft synthetic resin material.

At this time, the resin flowing between the mold, the core metals 4 and 5, and the outer periphery of the casting pipe 8 reaches the boundary between the casting pipe 8 and the core metals 4 and 5.
It is guided by the annular taper part 9 and flows smoothly, so that it does not become stagnant there.

Next, in the embodiment shown in FIGS. 4 to 6, the casting pipe 8
In this case, the process can be simplified by making the bubble core 10 also made of aluminum die-casting and molding it at the same time.

The other structures and functions of this embodiment are the same as those of the previous embodiment.

According to the present invention, the welded part of the rim core metal and the spoke core metal, and the outer periphery of each core metal in the vicinity thereof, are made thinner toward the outer peripheral surface of each core metal at the end of a cast pipe that is integrally coated. Since a part of the annular taper is formed, the rim core metal and the spoke core metal are firmly connected by welding, and the outer periphery is integrally covered with a cast pipe to strengthen the welded area, increasing the strength of the welded area. Since the outer surface is coated smoothly with the cast pipe, it is possible to smooth the flow of the resin for molding the rim and spoke parts formed by casting on the outer surface of each core metal. Since a part of the annular taper is formed at the end of the molding pipe, the end face of the casting pipe does not protrude at an acute angle from the core metal and obstruct the flow of molding resin, which prevents cavitation caused by swirling of the injected resin. can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional example, FIG. 2 is a front view of a part of a steering wheel showing an example of implementation of the present invention, FIG. FIG. 5 is a front view of a part of the steering wheel showing the embodiment, FIG. 5 is a cross-sectional view taken along line A--A, and FIG. 6 is a cross-sectional view taken along line B--B in FIG. 4... Rim core metal, 5... Spoke core metal, 7... Welded part, 8... Cast pipe,
9... Part of the taper.

Claims (1)

[Scope of utility model registration request] A rim core metal, a spoke core metal welded to the rim core metal, and a cast pipe integrally covering the welded portion of both core metals and the outer periphery of each core metal in the vicinity thereof, A steering wheel characterized in that each core metal at the end of a cast pipe is thinned toward the outer peripheral surface to form a part of an annular taper.