JPS59100055A - Steering wheel - Google Patents

Abstract

PURPOSE:To transmit the force of peration to a boss directly from a spoke core iron, by welding a curved central part of the spoke core iron along a boundary part between a vertical peripheral wall of the boss and a flange part, while engaging a rising part of the core iron with a notch part of the flange part. CONSTITUTION:A spoke core iron 35 is curved along a boundary part between a vertical peripheral wall of a boss 21 and a flange part 23 solidly formed horizontally by means of forging as its central part 36, while a pair of rising parts 37 are cuvedly formed at both outsides of the central part 36, and an arm part 38 is curvedly extended outward from the upper end of the paired rising parts 37. The curved central part 36 of the spoke core iron 35 is welded along the boundary part between the vertical peripheral wall of the boss 21 and the flange part 23 and also locked at both upper and lower parts by welding (39), while these paired rising parts 37 are engaged with notch parts 24 at both sides of the flange part 23, and the tip of the arm part 38 is butted to a rim core iron 40 by welding and locked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a steering wheel for an automobile or the like.

[Technical background of the invention and its problems]

2. Description of the Related Art In general, a steering wheel for an automobile or the like has a wheel portion attached to a central boss fitted to a steering shaft via spokes.

Recently, there has been a strong demand for this type of steering wheel to reduce weight, improve reliability, and reduce cost.

Therefore, as shown in FIGS. 1 and 2, the present inventors fitted the central cylindrical part σJ of the boss cover 0z to the lower end of the boss (11), and fitted the central cylinder part σJ of the boss cover 0z to the lower part of the boss cover 02.
A cylindrical part (15) having an operating part (alpha) on the outside is installed vertically concentrically, and the operating part (alpha) is brought into contact with the cancel cam of the direction indicator, thereby reducing the weight. - The center part of a horizontal flange plate (Le) is fitted onto the outer periphery of the upper end of the boss (aI) and welded aη on one side. The curved center part of the spoke core metal (18) is joined and welded (I
I suggested something that I did.

This item 11 is effective in avoiding the defect of multilayer increase that conventional steering wheels have, but it slips on the side of the upper outer periphery of the boss αD and the spoke core made of a round bar material ← Join and weld the curved center part of (11
Therefore, the welding strength of the welded portion where the operating stress of the steering wheel is concentrated is important, and special attention must be paid to setting and maintaining appropriate welding conditions.

[Purpose of the invention]

The present invention is intended to solve the above-mentioned problems, and aims to enable easy and reliable fixation of a boss and a spoke core metal.

[Summary of the invention]

The present invention provides a horizontal flange portion on the upper part of the vertical outer circumferential wall of a metal boss fitted to the steering shaft,
Along the boundary between the vertical outer peripheral wall of the boss and the flange part, the curved center part of the spoke core metal is joined and fixed by welding, and a pair of rising edges □ are formed on both sides of the center part of the spoke core metal. The spoke part is characterized by engaging with a pair of notches formed on both sides of the seven-rank part, so that the operating force is directly transmitted from the spoke core metal to the boss.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 6 to 5.

0υ is a cylindrical boss made of metal such as iron that is fitted onto the steering shaft. This boss Cυ has a shaft hole (2 holes) in the center, and a shaft hole (2 holes) in the upper end of the vertical outer wall. A horizontal flange portion (c) is integrally formed to protrude from the forging pressure, and a pair of notches 04) are formed on both sides of this flange portion (c). In addition, there is a cover mounting hole (c) and a small hole for a puller tap (c) in the flange part (c) above.
c) are drilled.

A synthetic resin boss cover (5) is attached to the lower outer periphery of the boss (21). This boss cover (goods) is
A horizontal flange part is provided on the inner side of the lower end of the enclosing wall arranged outside the boss (goods) so as to surround it,
The cylindrical part at the center of the flange part 01 is fitted into the boss (2I), and the cylindrical part 0 at the bottom of the flange part 01 is fitted into the boss (2I).
1) is provided in a protruding manner, and a pair of actuating portions 6 are provided in protruding positions in the outer axial direction of this cylindrical portion Gl) and at opposing positions. This actuating part rotates the direction indicator by coming into contact with the cancellation cam of the direction indicator, which is fixed to the tube surrounding the steering shaft, and restores it to its original position. This is equivalent to a cancel bin.

Further, a mounting part (2) is integrally provided on the upper part of the flange part 091 of the boss cover (5), and the cover mounting hole (2) of the boss (7/2 rank part (c)
5) The screws (B) are screwed together, and the boss (21) is screwed together.
) is fixed to the boss cover (2).

(C) is a spoke core made of round bar material, and the center part (to) of this spoke core is a flange formed horizontally integrally with the outer circumferential wall of the boss (21) by forging. It is curved along the boundary between the central part (G) and a pair of rising parts 07) are bent on both sides of the central part (G), and the distance between the arm parts extends from the upper end of the pair of rising parts c17). It is bent and extended outward.

Then, the curved central part of the spoke core metal (G) (
The above boss (2υ) is connected to the boundary between the vertical outer peripheral wall and the flange part, and is fixed by welding G1 at the upper and lower parts, and the pair of rising parts On are connected to the 7 launch part C.
It is engaged with the notches @ on both sides of 2~, and the tip of the arm part (to) abuts against the rim core metal (40) and is fixed by welding.

A synthetic resin cover (
41) is provided, and a synthetic resin coating layer (outer side of the rim core bar 41) is provided.

Then, the boss CI) is fitted onto the steering shaft (fourth floor) through the shaft hole (221) and tightened and fixed with a nut (44).

Then, when you operate the steering wheel, the operating force is transmitted to the rim core metal (3→, boss (2+), and steering shaft 03), but when the vehicle is stationary, Even if an excessive force couple occurs when operating the steering wheel, etc., the rising part (3) of the spoke core metal 09
7) and the notch (24) of the 7 run part @ of the boss Cυ, the operating stress is reliably transmitted from the spoke core metal 09 to the boss (20) integrated with the 7 launch part □□□.

Also, as in the above embodiment, instead of the cancel bin,
Boss cover (5) with operating part C3 side that performs the same function
The boss Q
υ can be made into a simple shape consisting of a vertical outer peripheral wall, and the boss (21) and the horizontal flange part (c) can be integrally formed by forging. Therefore, it is extremely easy to form an arc-shaped cross section that approximately matches the cross-sectional outer periphery of the spoke core metal. Also, boss Cυ
As the molecules are oriented on the arcuate surface by forging, the root part becomes strong where the second moment of area of the operating torque is applied the most, and the boss t21) and the 7 launch part (c) are integrally machined by cutting. Even if the flange portion (c) is made thinner, there is no problem in terms of strength, so the weight can be reduced.

Next, in the case shown in Fig. 3r6, a boss cover (2) is formed by insert molding on the outside of the boss (21) and the spoke core metal (T), and the boss 0υ, the spoke core metal (to), and the boss cover (5) are formed by insert molding. ), and further, their outer peripheries are integrally covered with a coating layer 511 made of foamed polyurethane or the like together with rim core metal oil, and a part of the cover (41 cL) of the spoke core metal (2) and the cover of the rim core metal (41) are integrated. The seedling layer part (42, z) is integrated, and the other structure is the same as that of the above embodiment.

In addition, in the illustrated embodiment, the curved center part (end) of the spoke core metal 0 is disposed below the boss (2+) and
However, as shown in the off-line diagram and in Figure 18, the curved center part (toward) of the spoke core metal may be arranged and fixed above the boss (2B).

In addition, in implementation, the rising portion C37) of the spoke core metal (G) may rise vertically or diagonally upward, and the notch G24) of the flange portion (C) with which this rising portion (37) engages is preferably formed into a semicircular or semielliptical shape.

In addition, since the boss CI) and the spoke core metal (to) are engaged at the rising part (3'O) and the notch Q slope, it can withstand spot welding rather than welding to form a bead. I can do it.

Although it is preferable that the flange part (to) of the boss CD be formed integrally, the 7 flange part (c) may be formed separately and fixed to the boss Q1) by welding.

[Effects of the Invention] According to the present invention, the curved center portion of the spoke core metal is joined and fixed by welding at the boundary between the vertical outer peripheral wall of the boss and the seven flange portions, and the center portion of the spoke core metal is Since the pair of rising portions on both sides of the flange are engaged with the pair of notches on both sides of the 7 flange portion, the operating stress of the steering wheel is not only transmitted to the boss via the welded portion, but also between the rising portion and the notch. temperature is directly transmitted to the ℃ post through engagement with the ℃ position.

The load on the welding area is reduced and reliability is improved, and the boss and spoke core metal can be fixed with sufficient durability even with a small welding allowance, making manufacturing easier.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway back view of a conventional steering wheel, Fig. 2 is a sectional view of the boss portion thereof, and Fig. 6 is a partially cutaway view showing an embodiment of the steering wheel of the present invention. Figure 4 is a partial plan view, Figure 5 is a perspective view, Figure 116 is a partially cutaway side view showing another embodiment of the steering wheel of this invention, and the off-line view is a side view. FIG. 78 is a partial plan view showing still another embodiment, and FIG. 78 is a perspective view thereof. En/rumor post, (c) φ/flange part, (2) fist φ notch, (to)--spoke core metal, 061Φ/center part, c3n
...Rising section, nth floor -- Steering shaft. November 60, 1981 Inventor Kazu Yudo Nishijima Tatsu Doi Patent applicant Nippon Blast Co., Ltd.-2

Claims (1)

[Claims] (1) A flange is provided horizontally on the top of the vertical outer circumferential wall of a metal boss that is fitted to the steering shaft,
At the boundary between the vertical outer peripheral wall of the boss and the flange part, the curved center part of the spoke core metal is joined and fixed by welding, and a pair of rising edges are formed on both sides of the center part of the spoke core metal. A steering wheel characterized in that the flange portion is engaged with a pair of notches formed on both sides of the flange portion.