JPS6192957A - Steering wheel - Google Patents

Abstract

PURPOSE:To prevent the welding distortion of a spoke core metal by pinching the fixed sectoin of the spoke core metal with a flange section protruded on the outer periphery of a boss coupled with a steering shaft and a pinching plate welded on the outer periphery of the boss. CONSTITUTION:A flange section 15 is protruded on the outer periphery of a boss 8 made of metal and coupled with a steering shaft, and an arc-like fixed section 16 in contact with nearly a half of the outer periphery of this boss 8 is formed in the center of a spoke core metal 5. The fixed section 16 of the spoke core metal 5 is brought into contact with the outer periphery of the boss 8 and the lower section of the flange section 15, and a pinching ring 17 is brought into contact with the lower section of the fixed section 16, thus the fixed section 16 is pinched between the flange section 15 and the pinching ring 17. Furthermore, the pinching ring 17 and the outer periphery of the boss 8 are welded 18 together, and the flange section 15 and the near center of the fixed section 16 are welded 19. Accordingly, the spoke core metal 5 is prevented from being deformed due to the welding distortion, and strength, safety, etc. can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steering wheel for an automobile or the like, and particularly to a connection structure between a boss and a spoke core metal.

[Conventional technology]

For example, as shown in Japanese Utility Model Application Publication No. 58-192167, in a conventional steering wheel, when connecting the metal boss and the spoke core metal, seven flange parts are provided protruding from the outer periphery of the boss. At the same time, an arc-shaped fixing part that abuts a part of the outer periphery of the boss, for example, approximately half the outer periphery of the boss, is formed in the center of the spoke core metal, and the fixing part of the spoke core metal, the outer periphery of the boss, and the flange part are connected to each other. was welding.

[Problem that the invention seeks to solve]

In the case of the conventional connection structure described above, in addition to stress in the rotational direction, stress in the axial direction acts between the spoke core metal and the boss, so it is necessary to lengthen the welded part, and it is necessary to fix the spoke core metal. Almost the entire length of the section was welded to the outer periphery of the boss and the flange section.

Therefore, welding distortion is likely to occur in the spoke core metal, and the outer periphery of the spoke core metal and rim core metal is set in a mold for the coating material layer together with the annular rim core metal welded to both ends of the spoke core metal. When forming a covering material layer on the spoke core metal, it was easy for the spoke core metal to be located on the surface of the covering material layer, or to cause cracks, and furthermore, it was sometimes impossible to set it in the mold.

The present invention has been made in view of these points, and an object of the present invention is to prevent welding distortion from occurring in the spoke core metal when connecting the boss and the spoke core metal.

[Means for solving problems]

In the steering wheel of the present invention, a flange portion 1 is provided on the outer periphery of a metal boss 8 that is fitted onto a steering shaft 6.
5, and an arc-shaped fixing portion 1 that abuts a part of the outer periphery of the boss 8, for example, approximately half of the outer periphery of the boss 8.
6 is formed in the center of the spoke core metal 5, and the fixing part 16 of the spoke core metal 5 is connected to the outer periphery of the boss 8 and the flange part 1.
5, and a clamping ring 17 as a clamping plate is brought into contact with the lower part of the fixing part 16 of the spoke core metal 5 to sandwich the fixing part 16 between it and the flange part 15 of the boss 8, This clamping plate and the outer periphery of the boss 8 are welded 18
In addition, the flange portion 15 of the boss 8 and the fixing portion 16 of the spoke core metal 5 are partially welded at approximately the center.

[Effect]

The steering wheel of the present invention includes a flange portion 15 protruding from the outer periphery of the boss 8 and a clamping plate such as a clamping ring 17 welded to the outer periphery of the boss 8.
The fixing portion 16 of the spoke core 5 is clamped to fix the axial direction, and a portion of the spoke core metal 5 at approximately the center of the fixing portion 16 is welded 19 to the 7 flange portion 15 of the boss 8 to fix the rotational direction.

〔Example〕

Embodiments of the steering wheel of the present invention will be described with reference to the drawings.

FIG. 1 shows a steering wheel, which consists of an annular rim portion 1 and a boss portion 2 in the center.
As shown in FIG. 2, the rim core 4, which is made of a metal round bar of the rim part 1, is connected to the rim core 4, which is made of a metal round bar of the spoke part 3, and is connected by spoke parts 3. Both ends of the spoke core metal 5 are connected, and a metal substantially cylindrical boss 8 that is fitted onto the steering shaft 6 and screwed and fixed with a nut 7 is connected to the center of the spoke core metal 5. A covering material layer 9 made of synthetic resin is formed on the outside of the rim core metal 4 and spoke core metal 5, and a horn switch mechanism 10 and a horn pad made of synthetic resin are formed on the upper part of the central part of the boss 8 and spoke core metal 5. 11 is disposed, and a lower cover 12 made of synthetic resin is disposed below the central portion of the boss 8 and the spoke core metal 5.

Then, the spoke core metal 5 and the boss 8 are connected to each other by the third
4, a disk-shaped flange portion 15 is integrally provided on the outer periphery of the upper end of the boss 8 by forging or the like, and a part of the outer periphery of the boss 8, for example, approximately half the outer periphery of the boss 8. The abutting arc-shaped fixing portion 16 is connected to the spoke core metal 5.
The fixing part 1 of the spoke core metal 5 is bent at the center of the spoke core metal 5.
6 is fitted onto the outer periphery of the boss 8 to abut against the outer periphery of the boss 8 and the lower part of the flange portion 15, and the flange portion 15
= As a disc-shaped clamping plate made of a metal plate with almost the same shape as
5- Fitting the clamping ring 17 to the outer periphery of the boss 8 and abutting the outer periphery of the boss 8 and the lower part of the fixing part 16 of the spoke core metal 5;
With the fixing portion 16 of the spoke core metal 5 being sandwiched between the clamping ring 17 and the flange portion 15 of the boss 8, welding 18 is performed to weld the inner circumference of the clamping ring 17 and the outer circumference of the boss 8 over the entire circumference. At the same time, the flange portion 15 of the boss 8 and the fixing portion 16 of the spoke core metal 5 are welded 19 at a portion approximately in the center of the arc-shaped fixing portion 16, for example, at a length of 10 to 30 m. There is.

Therefore, since the welded portion of the fixed part 16 of the spoke core metal 5' is short and the fixed part 16 of the spoke core metal 5 is clamped, there is no fear that the spoke core metal 5 will be deformed due to welding distortion.

Note that even if the welded portion between the fixed part 16 of the spoke core metal 5 and the boss 8 is shortened, when operating the steering wheel,
The stress applied in the direction of rotation is small, and since the fixed part 16 is held between the two, there is no risk of breaking the weld 19, and the driver can grip the steering wheel for support when getting in or out of the car. When a driver collides with the steering wheel during a car crash, a large stress is applied in the axial direction, but the clamping ring 17 is firmly welded to the outer periphery of the boss 8, and this clamping ring 17 holds the fixed part 16. Welding 18.1 because it is securely sandwiched between the boss 8 and the flange 15
There is no need to worry about the destruction of 9.

Further, FIGS. 5 and 6 show a modification example, in which the fixing part 16 of the spoke core metal 5 is flattened from above and below, and the flange part 15 of the boss 8 and the clamping part 16 of the boss 8 are Abutment surfaces 22 and 23 that make surface contact with the ring 17 are formed on the upper and lower sides of the fixed part 16, thereby preventing backlash in the axial direction.
．． 25 to the flange portion 1 of the boss 8.
5 and the corresponding edges of the clamping ring 17, the fixing portion 16 of the spoke core metal 5 is prevented from being handled forwardly, that is, upwardly in FIG.

〔Effect of the invention〕

As described above, according to the present invention, the fixed part of the spoke core metal is held between the flange part protruding from the outer periphery of the boss and the clamping plate firmly welded to the outer periphery of the boss, so that the axial direction can be ensured. At the same time, weld a portion of the spoke core metal, a portion that can be fixed in the rotational direction, to the flange of the boss at approximately the center of the fixed part of the spoke core metal, that is, at a position where the spoke core metal is difficult to deform due to welding distortion. Since the boss and the spoke core metal are connected by fixing the rotational direction thereof, the spoke core metal will not be deformed due to welding distortion, and there will be no inconvenience when forming the coating material layer. It has sufficient strength and is highly safe.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the steering wheel of the present invention, and FIG. 2 is a third side view taken along line II-II in FIG.
The figure is a bottom view of the main part, FIG. 4 is a side view from the IV-TV view of FIG. There is a Vl-Vll view of the figure. 5. Spoke core metal, 6. Steering shaft, 8
...Boss, 15..7 Lunge part, 16..Fixing part, 17
...Pinching ring as a holding plate, 18.19...Welding. October 12, 1981

Claims (1)

[Claims] (1) A flange portion is provided protruding from the outer periphery of a metal boss that is fitted onto the steering shaft, and an arc-shaped fixing portion that abuts a part of the outer periphery of this boss is formed in the center of the spoke core metal. , the fixed part of the spoke core metal is brought into contact with the outer periphery of the boss and the lower part of the flange part, and a holding plate is brought into contact with the lower part of the fixed part of the spoke core metal to connect this fixed part with the flange part of the boss. A steering wheel characterized in that the outer periphery of the boss is welded to the sandwiching plate, and a portion of the flange of the boss and a fixed portion of the spoke core metal are welded to each other at approximately the center thereof.