JPH03268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for attaching a slip ring to a steering wheel of an automobile or the like.

[Conventional technology]

In the steering wheel of automobiles, etc.,
A slip ring is provided on the back side of the central boss portion, and electrical connections are made between, for example, the horn switch mechanism of the steering wheel, the horn device, and the battery via this slip ring.

In this case, as a method of fixing the slip ring, as shown in FIG. 6 and FIG. A slip ring e is fitted into the slip ring fitting groove d, and several parts of the side wall of the slip ring fitting groove d are caulked to the slip ring e to form a fixing part f. Part f
There is a method in which the slip ring e is held between the inner bottom surface of the slip ring fitting groove d and the inner bottom surface of the slip ring fitting groove d. Also, the 8th
As shown in the figure, a method is also used in which a plurality of mounting holes g are formed in the inner circumferential portion of the slip ring e, and the mounting holes g are used for mounting with screws h.

[Problem that the invention seeks to solve]

However, when attaching by caulking as described above, the fixing part f formed by caulking
The amount of protrusion is small, and the diameter of the slip ring fitting groove d and the slip ring e changes with changes in the ambient temperature. In this case, when the inner side wall of the slip ring fitting groove d contracts due to a change in ambient temperature, the slip ring e becomes looser and the slip ring e
There is a risk that it will come off the fixing part f and fall out of the slip ring fitting groove d.

Furthermore, when attaching the slip ring using screws, it is troublesome to tighten the screws, and the screws also tend to loosen during use and cause rattling.

The present invention was made in view of the above-mentioned points, and an object of the present invention is to securely fix a slip ring using a simple method.

[Means for solving problems]

The slip ring mounting method for a steering wheel of the present invention involves forming an annular slip ring fitting groove 7 on the back side of the boss portion 4 of the steering wheel body 1, and forming a slip ring fitting groove 7 on the inner circumferential wall 8 of the slip ring fitting groove 7. A plurality of protrusions 9 are formed on the fitting groove 7 side with gaps between them and the inner bottom surface of the slip ring fitting groove 7, and a plurality of pin-shaped protrusions are formed from the inner bottom surface of the slip ring fitting groove 7. A notch 14 corresponding to each of the protrusions 9 is formed on the inner circumferential edge of the annular conductive slip ring 13 which is fitted into the slip ring fitting groove 7. An opening notch 15 corresponding to each of the pin-shaped protrusions 10 is formed on the outer periphery, and the slip ring 13 is attracted and held by a cylindrical magnet 20, and the slip ring fitting groove 7 of the steering wheel body 1 is fitted into the slip ring fitting groove 7 of the steering wheel body 1. magnet 2
The slip ring 13 held at 0 is fitted while aligning each protrusion 9 and each notch 14, and aligning each pin-shaped protrusion 10 and each opening notch 15,
The slip ring 13 is brought into contact with the inner bottom surface of the slip ring fitting groove 7, and the steering wheel body 1 and the slip ring 13 are relatively rotated by a predetermined angle, and the inner peripheral edge of the slip ring 13 is supported by each protrusion 9. At the same time, the slip ring 13
Each pin-shaped protrusion 10 is fitted into the fitting hole 18 of each opening notch 15, and then the magnet 20 is removed from the slip ring 13.

[Effect]

In the present invention, the slip ring 13 is fitted into the slip ring fitting groove 7 while being attracted and held by a cylindrical magnet 20, and the slip ring 13 is rotated by a predetermined angle, so that the slip ring 13 is attached to each protrusion 9.
and the fitting hole 1 of the opening notch 15.
A pin-shaped protrusion 10 is fitted onto the pin 8 for positioning.

〔Example〕

Hereinafter, a method of attaching a slip ring according to the present invention will be explained with reference to FIGS. 1 to 5.

In FIG. 1, reference numeral 1 denotes a steering wheel body, and this steering wheel body 1 has an annular rim portion 2, spoke portions 3, and boss portions 4. As shown in FIG. As shown in FIG. 3, in this boss portion 4, a synthetic resin boss cover 6 is fitted and fixed to the lower part of a metal cylindrical boss 5 that is fitted onto a steering shaft (not shown).

As shown in FIGS. 2 to 4, this boss cover 6 has an annular slip ring fitting groove 7 formed on its lower surface as a slip ring fitting portion.
A plurality of protrusions 9 (four in this embodiment) are provided radially on the inner circumferential wall 8 of the slip ring fitting groove 7 , and each protrusion 9 is formed in the inner peripheral wall 8 of the slip ring fitting groove 7 . It is formed with a gap between it and the inner bottom surface. Further, a plurality of pin-shaped protrusions 10 (two in this embodiment) protrude from the inner bottom surface of the slip ring fitting groove 7 . Note that a cylindrical portion 11 is formed at the center of the lower surface of the boss cover 6,
A signal canceling section 12 is formed on the outer peripheral surface of this cylindrical section 11.

Reference numeral 13 denotes a ring-shaped slip ring made of conductive metal that is fitted into the slip ring fitting groove 7, and a notch 14 is formed on the inner peripheral edge of the slip ring 13 at a location corresponding to each of the protrusions 9. There is. Furthermore, opening cutouts 15 are formed on the outer peripheral edge of the slip ring 13 at locations corresponding to the respective pin-shaped protrusions 10. Each opening notch 15
The fitting hole 1 is inserted into the rear end from the opening 16 through a guide portion 17 having a tapered guide edge in the lateral direction.
8 are arranged in series, and this fitting hole 18 and the guide part 1
A constricted portion 19 is provided between the guide portion 17 and the guide portion 17 and protrudes from the outer edge, and the width of the guide portion 17 at the constricted portion 19 is set to be slightly smaller than the diameter of the pin-shaped protrusion 10.

Then, as shown in FIG. 5, the lower surface of the slip ring 13 is attracted and held by the cylindrical magnet 20, and the slip ring fitting groove 7 on the back side of the steering wheel body 1 is held by the magnet 20. The slip ring 13 is pushed in and fitted by aligning each protrusion 9 with each notch 14 and each pin-shaped protrusion 10 with the opening 16 of the open cutout 15, so as to fit the slip ring 13 into the inner bottom surface of the slip ring fitting groove 7. The upper surface of the slip ring 13 is brought into contact with the upper surface of the slip ring 13.

Next, slide the slip ring 13 in the direction of the arrow in Figure 4.
is rotated by a predetermined angle using a cylindrical magnet 20,
At the same time, the inner peripheral edge of the slip ring 13 is positioned on each protrusion 9 to support the slip ring 13 by each protrusion 9, and together with this, each pin-shaped protrusion 1
0 through the guide portion 17 through the opening 16 of each opening notch 15, and further pushes open the constricted portion 19 to fit into the fitting hole 18, thereby positioning and holding the slip ring 13. Then, the magnet 20 is removed from the slip ring 13.

The slip ring 13 is connected to one end of a horn switch mechanism (not shown) of the steering wheel body 1, and the other end of the horn switch mechanism is connected to a battery of an automobile or the like via a steering shaft.

In addition, as shown in Fig. 3, the slip ring 1
A contact piece 21 is connected to 3 from below,
This contact piece 21 is connected to a battery of a car etc. via a lead wire, and the boss 5
When fitted to the steering shaft, it comes into contact with the lower surface of the slip ring 13.

In addition, when carrying out the implementation, a cylindrical magnet 20 is fixed to a jig, and a slip ring 1 is attached to the magnet 20.
3 and attach it to the steering wheel body 1.
Grasp the sides and fit each protrusion 9 and each pin-shaped protrusion 10 into each notch 14 and opening notch 15,
It may be attached by rotating the steering wheel body 1.

Further, in the embodiment described above, the constricted portion 19 in the opening notch 15 of the slip ring 13 is formed on the outer edge of the guide portion 17, but this constricted portion may also be formed on the inner edge of the guide portion 17. Alternatively, it may be formed on the outer and inner edges of the guide portion 17.

〔Effect of the invention〕

According to the present invention, the slip ring is attracted and held by a cylindrical magnet and is fitted into the slip ring fitting groove, rotated by a predetermined angle, the inner peripheral edge of the slip ring is supported by each protrusion, and the slip ring is held by the cylindrical magnet. Since the pin-shaped protrusions are fitted into the opening notches for positioning, the slip ring can be easily attached using a cylindrical magnet, and the mounting operation is easy. It is held in place by each pin-shaped protrusion, and is securely fixed so that it does not rattle during use.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention, in which FIG. 1 is a perspective view of a steering wheel, FIG. 2 is an exploded perspective view of main parts, and FIGS. 3 and 4 are main parts. , FIG. 5 is a perspective view showing the mounting state of the slip ring, FIG. 6 is a perspective view of a conventional steering wheel, FIG. 7 is a perspective view of a part of FIG. 6, and FIG. 8 is a perspective view of a conventional steering wheel. FIG. 7 is a perspective view showing another example. DESCRIPTION OF SYMBOLS 1...Steering wheel body, 4...Boss portion, 7...Slip ring fitting groove, 8...Inner peripheral wall, 9...Protrusion, 10...Pin-shaped projection, 13...
Slip ring, 14... Notch, 15... Opening notch, 18... Fitting hole, 20... Magnet.

Claims (1)

[Scope of Claims] 1. An annular slip-ring fitting groove is formed on the back side of the boss portion of the steering wheel body, and this slip-ring fitting groove is formed on the inner peripheral wall of the slip-ring fitting groove on the side of the slip-ring fitting groove. A plurality of protrusions are formed with gaps between them and the inner bottom surface of the groove, and a plurality of pin-shaped protrusions are provided protruding from the inner bottom surface of the slip ring fitting groove to fit into the slip ring fitting groove. A notch corresponding to each of the protrusions is formed on the inner circumferential edge of the annular conductive slip ring to be fitted, and an opening notch corresponding to each of the pin-shaped protrusions is formed on the outer circumferential edge of the slip ring, The ring is attracted and held by a cylindrical magnet, and the slip ring held by the magnet is aligned with each protrusion and each notch in the slip ring fitting groove of the steering wheel body,
Fitting each pin-shaped protrusion and each opening notch, bringing the slip ring into contact with the inner bottom surface of the slip ring fitting groove, and relatively rotating the steering wheel body and the slip ring by a predetermined angle, A steering wheel characterized in that the inner peripheral edge of the slip ring is supported by each projection, each pin-shaped projection is fitted into a fitting hole of each opening notch of the slip ring, and then the magnet is removed from the slip ring. How to install a slip ring.