JPS6136055A - Manufacture of steering wheel of car - Google Patents

Abstract

PURPOSE:To improve strength by forming a spoke by radially projecting a plurality of arms from a fixed wheel and installing an engaging piece at the top edge of the arm and constituting a steering wheel by superposing the fitting surfaces of two-divided wheel onto the above-described engaging piece. CONSTITUTION:A spoke 4 is formed by radially projecting a plurality of arms 7 onto the outer periphery of a fixed wheel 6 and by installing an engaging piece 8 at the top edge of each arm 7. Further, the spoke 4 is integrally punched out from a metal plate and the contraction work to a desired depth is carried out. While, a wheel 5 is formed by dividing a wooden material into the upper and lower parts, and a groove 9 having a depth at least over the half of the thickness of the engaging piece 8 and the diameter of the outer periphery equal to the length ranging from the center of the spoke 5 to the outer edge of the engaging piece 8 is formed onto each fitting surface, and an installation recess 10 having a same shape to the engaging piece 8 is formed. After the engaging piece 8 is fitted into the installtion recess of one wheel 5a, the other wheel 5b is superposed.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a steering wheel for an automobile.

The steering wheel of a car consists of a wheel and spokes. The wheel is a wooden ring, while the suboque is a bottom-shaped piece punched out of a metal plate such as aluminum, and is attached to the wheel by fitting it into the wheel. As shown in Figure 1, a ring 2 is integrally formed around the spoke L, while the wheel 3 is divided into two halves, upper and lower. It was then glued together.

That is, this ring 2 is, so to speak, a core metal of the wheel 3, and is formed for the purpose of reinforcing the wheel 3.

However, in reality, if the ring 2 is formed around the spokes 1, the manufacturing cost of the control wheel will increase because the area of the 9T material plate used to punch out the - spokes will become thicker and the number of processing steps will increase. F increases and T increases, and the impact resistance of the control wheel actually decreases. This is because spokes 1 can be punched out and then drawn into a υ shape to increase their strength, but if this process is done, ring 2 will be distorted and the roundness will be lost.
Since it becomes impossible to manufacture the control wheel if the wheel (wooden) and ring (metal) do not match, the drawing process must be limited to a range that does not impair the roundness of ring 2. Since the adhesive force is relatively weak, wheel 3
When an impact force of about 200 kg is applied to the ring, not only will the ring 2 separate and the ring 2 will not reinforce the wheel 3, but the wheel 3 will be more likely to be damaged. .

The present invention solves the above-described drawbacks of the conventional control wheels, and instead of forming a ring around the spokes, a mounting piece is formed at the tip of the spoke, and
This is narrowed down to an appropriate depth to exhibit a predetermined strength.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the figure, reference numeral -4 is a spoke, and 5 is a wheel.In order to fix the spoke 4 to the column, two or more arms 7 are protruded radially from the outer periphery of the fixed wheel 6.
Furthermore, it has a shape with an engagement piece 8 attached to its tip,
These are punched integrally from a single metal plate and then drawn to the desired depth. There are no particular limitations on the shape or number of arms 7, but it is necessary that there be at least two or more arms 7 and that they are symmetrical on the left and right sides.
Furthermore, it is important that the engagement piece 8 is located on the circumference.

The wheel 5 is made of a wood material, and is formed by dividing it into two parts, upper and lower, and the mating surface of the eaves is provided with a groove on the outer periphery at a depth of at least one part of the thickness of the engagement piece 8. A groove 9 whose diameter is the same as the length from the center of the spoke 4 to the outer edge of the engagement piece 8 is cut, and a mounting recess W having the same shape as the engagement piece 8 is formed.
Delete.

In order to assemble the wheel 5 formed in this way and the spokes 4 and connect them to the control wheel, first, one of the wheels 5a is assembled.
The engagement piece 8 is fitted into the mounting recess lO, and then the other wheel 5b'f is overlaid and bonded to it.

As detailed above, the present invention is a control wheel formed by assembling and forming a wheel and spokes, in which the spokes have arms projecting radially from a fixed wheel, and engagement pieces are formed at the tips of the spokes. Compared to conventional rings that are formed at the tip of the arm, the amount of metal plate material needed to create - yJT spokes is smaller, and it can be drawn to the desired depth. This allows the spokes to have sufficient strength.0 Also, since the mating surface of the wheel is cut to match the engagement piece of the spoke, the spokes can be easily positioned relative to the wheel, reducing assembly costs. In particular, the upper and lower wheels are bonded over the entire surface, so the strength of these materials is fully demonstrated, so in the end, the control wheels have impact resistance. It becomes something that is not good enough.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway exploded perspective view showing a conventional control wheel, and FIG. 2 is an exploded perspective view showing an embodiment of the present invention. 4; Spoke 5; Wheel 6; Fixed ring 7; Arm 8; Engagement piece 9; Groove lO; Mounting depression Fig. 1 Fig. 2

Claims (1)

[Claims] In a control wheel consisting of a wheel and spokes, the spokes are made of a single metal plate and are integrated with a fixed wheel, two or more arms projecting radially around the outer circumference, and an engaging piece at the tip of the arm. After punching, the wheel is drawn to the desired depth, and the wheel is formed by dividing it into upper and lower halves, with a depth of at least half the thickness of the engagement piece on the mating surface of the two. Now, cut a groove whose outer periphery coincides with the outer edge of the engaging piece, and also cut a mounting recess that has the same shape as the engaging piece, fit the engaging piece into the mounting recess of one wheel, and then A method for manufacturing a control wheel characterized by overlapping and bonding the other wheel.