JPH0867233A - Key ring of steering shaft - Google Patents

Abstract

PURPOSE: To shorten the working time and reduce the weight by forming a necking part contracted nearly to the outside diameter of the steering shaft of the exterior finish partner at the end part of a short pipe and forming a keyway on the side surface. CONSTITUTION: A pipe 3 as raw material member is cut to a short pipe 3a, and a keyway is press-drilled by using a trimming die having the shape of the keyway 2 from the outer peripheral side of the trimming hole by using a cam pierce mold. Then, a necking part 1 is formed through the press work. The necking part I can be obtained by the press molding for both the end parts. The key ring is fixed by the welding on a steering shaft. Also, another means such as caulking and screw fixation can be adopted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped member for locking a steering wheel key of a vehicle such as an automobile on the side of a steering shaft, and to an improvement of a key ring having a key groove and mounted on the steering shaft. Is.

[0002]

2. Description of the Related Art Conventionally, two methods of manufacturing a key ring are known, a bar work method and a chuck work method. In both cases, an inner diameter cutting process is required to make the diameter of the steering shaft exterior, and the side keyway is similarly cut. For example, Fig. 5 shows an example of the bar work method. In (a), the body 11 is cut into a predetermined length after the rod-shaped material 10 has been cut to the required length, and then the steering is performed as shown in (b). The product was obtained by cutting the shaft to an inner diameter D that can be installed on the shaft, punching the key groove 12 as shown in (c), and removing the burrs from the key groove cutting portion. The chuck work method is to cut the rod-shaped raw material into a predetermined length first, then cut the inner diameter,
Performs key groove cutting and burring.

[0003]

When the key ring is manufactured by cutting or cutting as in the prior art, it takes a lot of time and labor for the key ring, and the side wall of the key ring is almost entirely attached to the steering shaft. The entire diameter is formed with the same wall thickness as possible, and there is no room for weight reduction. It is intended to solve these points.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a key ring in which a necking portion 1 narrowed to almost the outer diameter of a steering shaft of an external partner is provided at an end portion of a short pipe, and a key groove 2 is provided on a side surface. . The short pipe herein may be a long pipe cut or a steel plate processed into a pipe shape.

[0005]

The key ring of the present invention can be manufactured from a short pipe made of sheet metal, and both the necking portion 1 and the key groove 2 can be pressed. The inner diameter of the sheet metal pipe is restricted to the outer diameter of the steering shaft by the necking portion 1 so that the inner and outer diameters can be regulated and the strength can be ensured, resulting in a lightweight and highly rigid key ring.

[0006]

1 (a) to 1 (d) are cross-sectional views showing a manufacturing process of a key ring of the present invention. FIG. 2 is a front view of the manufactured key ring, and FIG. 3 is a side view. FIG. 4 is a front view showing a state in which the steering shaft is exteriorly mounted.

The key ring shown in these figures is a short pipe obtained by cutting a raw material pipe into a predetermined length, and a necking portion 1 narrowed to the outer diameter of the steering shaft of the external counterpart is provided at the end and the side surface. Is provided with a key groove 2.

A concrete example of the manufacturing process is shown in FIGS. 1 (a) to 1 (d). In (a), the raw material pipe 3 is cut into a predetermined length to form a short pipe 3a. Further, in (b), the key groove 2 is provided by press working. The cam piercing type is used for this. A punch having the shape of the key groove 2 punches the key groove from the outer peripheral side of the hole.

In (c), the necking portion 1 is also formed by pressing. The necking portion 1 is obtained by press-pressing both ends. At this time, a structure in which the body of the short pipe is fixedly held is preferable.

FIG. 4 shows a state where the key ring is attached to the steering shaft. The fixing is performed by welding, but other means such as caulking and screwing can be adopted.

[0011]

According to the present invention, the inner and outer diameters of the key ring are accurately regulated by cutting or necking of the pipe, and the side holes can be easily punched by sheet metal pressing. In addition, the time and effort required to manufacture the key ring have been reduced, the processing time has been shortened, and the key ring has been made lighter.

[Brief description of drawings]

1A to 1D are cross-sectional views showing a manufacturing process of a key ring of the present invention.

FIG. 2 is a front view of the manufactured key ring.

FIG. 3 is a side view of the same.

FIG. 4 is a front view showing the exterior of the steering shaft.

5 (a) to 5 (c) are views showing a key ring manufacturing process by a conventional bar work method.

[Explanation of symbols]

 1 Necking part 2 Keyway

Claims (1)

[Claims] 1. A necking portion is provided at an end of the short pipe, the necking portion being narrowed to approximately the outer diameter of a steering shaft of an exterior partner,
A key ring on a steering shaft that has a key groove on its side surface.