JPS6129569Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a steering wheel for an automobile, etc., and particularly to one that is attached to a horn switch mechanism or the like in the center of the steering wheel.

Technical background of the invention Figures 1 and 2 show an example of a conventional steering wheel of this type. It has a structure in which an annular rim portion 4 is connected to two spoke portions 5.

The boss portion 3 is composed of a boss 7 having a support 6 to which a mounting plate 17 is attached, and a boss cover 8 that is screwed onto the boss 7 with screws (not shown) and covers the outer circumferential side and the lower surface of the boss 7. At the center of the boss 7 is a male threaded portion 9 at the tip of the steering shaft 2.
A through hole 1 is inserted through the hole 1 and is fitted into a serration portion 10 and a tapered portion 11 following this male thread portion 9.
2 is formed, and a nut 1 is inserted into the male threaded portion 9 of the steering shaft 2 that protrudes through the through hole 12.
3 are screwed together, so that the boss portion 3 is fitted onto the steering shaft 2.

The rim portion 4 is formed by covering the rim core metal 14 with an outer sheath 15 made of synthetic resin or the like.

The two spoke parts 5 are formed integrally with a mounting plate 17 for mounting a horn switch mechanism 16 (only the outer shape is shown) on the upper part of the boss part 3. The outer end portions of the spoke portions 5 penetrate the outer sheath 15 of the rim portion 4 and are fixed to the rim core metal 14, and
7 is fixed to the support column 6 of the boss 7 of the boss portion 3 via a bolt 18.

The bolts 18 are attached to the mounting plate 17.
An insertion hole 19 for inserting the nut 13, an operation hole 20 for operating the nut 13, and a mounting hole 21 for attaching the horn switch mechanism 16 and the like are formed.

Furthermore, a female screw hole 22 is formed in the mounting plate 17, and when removing the steering wheel 1 from the steering shaft 2, a removal tool 23 as shown in FIG. The firmly fitted steering wheel 1 is removed from the steering shaft 2 by a removal tool 23.

That is, the removal tool 23 has a support bolt 25 for the female threaded hole 22 and a pull-out bolt 26 for the steering shaft 2 threaded through the base plate 24, and the support bolt 25 is inserted into the female threaded hole 22 of the mounting plate 17 of the steering wheel 1. In this state, remove the pull-out bolt 26 from the steering shaft 2 from which the nut 13 has been removed.
Steering wheel 1
from the steering shaft 2.

Problems with the Background Art As described above, in the conventional steering wheel 1 of this type, the mounting plate 17 for the horn switch mechanism 16 etc. has the insertion hole 19 for the bolt 18 and the nut 1.
3, a mounting hole 21 for the horn switch mechanism 16, etc., and a female screw hole 22 for supporting the removal tool 23 are formed.Since many various holes are drilled in a narrow part, the strength is weakened and , the boss portion 3 could not be made smaller, and furthermore, the mounting layout of the horn switch mechanism 16 and the layout of the internal mechanism were subject to many restrictions.

Purpose of the invention The present invention was developed in view of the above points, and reduces the number of holes formed in the mounting plate for the horn switch mechanism etc. that is attached to the boss part of the steering wheel, thereby reducing the strength. In addition to preventing this, the boss part can be made smaller.
Furthermore, it is an object of the present invention to reduce restrictions on the mounting layout of a horn switch mechanism and the like and the layout of internal mechanisms.

Summary of the invention This invention connects the central boss part fitted to the steering shaft and the surrounding rim part with spoke parts, and fixes a mounting plate for a horn switch mechanism etc. to the upper part of the boss part via bolts. In the steering wheel, a female threaded hole is formed in the head of the bolt for screwing a support bolt of a removal tool for removing the steering wheel from the steering shaft, and thereby, a female screw hole is formed in the head of the bolt to screw a support bolt of a removal tool for removing the steering wheel from the steering shaft. This eliminates the female screw hole and reduces the number of holes in the mounting plate.

Embodiments of the invention Next, the invention will be specifically explained based on the embodiments shown in FIGS. 4 to 9.

4 and 5 show a first embodiment of the present invention, and this embodiment is basically similar to FIGS. 1 and 2.
Since the structure is similar to that of the conventional example shown in the figure, similar parts are given the same reference numerals and explanation thereof will be omitted, and only different parts will be explained.

A bolt 33 for fixing a mounting plate 32 such as the horn switch mechanism 16 to the boss portion 3 of the steering wheel 31 is provided at the position of the female screw hole 22 of the conventional example, and the head of this bolt 33 has a sixth As shown in the drawings and FIG. 7, a female threaded hole 34 is formed into which the support bolt 25 of the removal tool 23 of the steering wheel 31 is screwed.

Note that the mounting plate 32 does not have a female screw hole formed therein.

Then, when removing this steering wheel 31 from the steering shaft 2, the seventh
As shown in the figure, the female screw hole 3 in the head of the bolt 33
The steering wheel 31 can be pulled out from the steering shaft 2 by screwing the support bolt 25 of the removal tool 23 onto the steering shaft 2 and threading the pull-out bolt 26 against the steering shaft 2 from which the nut 13 has been removed. .

In this way, it is not necessary to provide a female screw hole in the mounting plate 32, and moreover, restrictions on the arrangement of the mounting hole 21 for mounting the horn switch mechanism 16 or the like can be reduced.

Furthermore, FIGS. 8 and 9 show a second embodiment of the present invention, and in this embodiment as well, the same reference numerals are given to the same parts as in the conventional example and the first embodiment described above. The explanation will be omitted and only the different parts will be explained.

The boss 42 of the boss portion 3 of the steering wheel 41 is formed in a small size, and a projection 44 is formed on the inner bottom surface of the boss cover 43.
A mounting plate 45 for the horn switch mechanism 16 or the like is fixed to this protrusion 44 via bolts 33 so as to surround the upper part of the boss 42 .

The two spoke parts 5 are composed of a spoke core metal 46 which is a round bar bent into a substantially F-shape, and an outer sheath 15. The outer end of the spoke core metal 46 is connected to the rim core metal of the rim part 4. 14, and the center portion of the spoke core metal 46 is arranged around the boss 42,
It is fixed to the boss 42 and the mounting plate 45 by welding.

Then, this steering wheel 41 also
Steering wheel 3 of the first embodiment described above
Similarly to Embodiment 1, it can be removed from the steering shaft 2 using the removal tool 23, and the same effects as in the first embodiment can be achieved.

Effects of the invention As described above, according to the invention, a female screw hole for screwing the support bolt of the removal tool for removing the steering wheel from the steering shaft is provided, and a mounting plate for a horn switch mechanism, etc. is attached to the boss part of the steering shaft. Since it is formed on the head of the bolt to be fixed, there is no need to provide a female screw hole on the mounting plate, and the number of holes formed on the mounting plate can be reduced, thus preventing a decrease in strength. At the same time, it is possible to downsize the boss portion, and furthermore, it is possible to reduce restrictions on the mounting layout of the horn switch mechanism and the like and the layout of the internal mechanism.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional steering wheel, FIG. 2 is a longitudinal sectional view of its boss, and FIG. 3 is a perspective view of a steering wheel removal tool.
FIG. 4 is a plan view of the first embodiment of the steering wheel of the present invention, FIG. 5 is a vertical sectional view of the boss portion thereof, FIG. 6 is a perspective view of the bolt, and FIG. 7 is an explanation of its operation. FIG. 8 is a plan view of the second embodiment of the steering wheel of the present invention;
The figure is a longitudinal sectional view of the boss portion. 2...Steering shaft, 3...Boss part,
4... Rim part, 5... Spoke part, 16... Horn switch mechanism, 23... Removal tool, 25... Support bolt, 31... Steering wheel, 32
...Mounting plate, 33...Bolt, 34...Female screw hole, 41...Steering wheel, 45...Mounting plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A central boss part fitted to the steering shaft and a peripheral rim part are connected by spoke parts, and a mounting plate for a horn switch mechanism etc. is attached to the upper part of the boss part via bolts. A fixed steering wheel, characterized in that the head of the bolt is formed with a female threaded hole into which a support bolt of a removal tool for removing the steering wheel from the steering shaft is screwed.