JPS6191888A - Fixation of slip ring - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a steering wheel for an automobile, etc.
The present invention relates to a slip ring fixing method for fixing a slip ring to a boss portion.

[Conventional technology]

For example, as shown in Japanese Utility Model Application No. 55-91369 or No. 56-171377, in the steering wheel of an automobile, a slip ring is installed in the central boss part of the steering wheel. For example, the horn switch mechanism of the steering wheel and the horn are opened and electrically connected to the battery through the ring.

In this case, as an inexpensive method of fixing the slip ring, as shown in FIGS. 4, the slip ring 5 is fitted into this slip ring fitting groove 4, and as shown in FIGS. There is a method in which the fixing portions 8 are formed by caulking the slip ring 5 and the slip ring 5 is sandwiched between the plurality of fixing portions 8 and the bottom portion 9 of the slip ring fitting groove 4.

[Problem that the invention seeks to solve]

However, in the case of this method, the amount of protrusion of the fixing part 8 formed by caulking is small, and the diameters of the slip ring fitting groove 4 and the slip ring 5 change with changes in ambient temperature. When the fixing portion 8 is formed on the inner circumferential portion of the ring 5, if the inner side wall 6 of the slip ring fitting groove 4 contracts due to a change in ambient temperature, the slip ring 5 becomes looser and slips. There was a risk that the ring 5 would come off the fixed part 8 and fall out of the slip ring fitting groove 4.

Note that even if the height of the side wall 6 is increased and the side wall 6 is caulked with strong pressure in order to increase the amount of protrusion of the fixing part 8, the amount of protrusion of the fixing part 8 will only be compressed and the amount of protrusion of the fixing part 8 will be reduced. does not increase much, and on the contrary, the strong pressure during caulking causes undesirable deformation of the slip ring fitting groove 4 and the slip ring 5.
(shown in Figure 6) may hinder reliable sliding contact.
The fixing part 8 itself becomes brittle, resulting in the slip ring 5 falling off.

The present invention has been made in view of these points, and an object of the present invention is to securely fix a slip ring by an inexpensive method of caulking.

[Means for solving problems]

The present invention provides a slip ring 5 in an annular slip ring fitting groove 4 formed in a boss portion 2 of a steering wheel 1.
A method of fixing the slip ring 5 in which the slip ring 5 is fixed in the slip ring fitting groove 4 by fitting the slip ring 5 into the slip ring fitting groove 4 and caulking at least a part of the upper end surface 7 of the side wall 6 of the slip ring fitting groove 4 to the slip ring 5. A tapered caulking part 11 that becomes higher toward the slip ring fitting groove 4 side is formed on at least a part of the upper end surface 7 of the side wall 6 of the slip ring fitting groove 4, and this caulking part 11 is used for slipping. The feature is that the ring 5 is caulked.

[Effect]

In the slip ring fixing method of the present invention, the caulking part 11 is tapered to become higher toward the slip ring fitting groove 4 side, and the caulking part 11 is caulked to form the fixing part 12, so that the fixing part 12 can slip. The amount of protrusion from the ring 5 can be increased.

〔Example〕

The slip ring fixing method of the present invention is shown in FIGS. 1 to 4.
This will be explained with reference to the figures.

The explanation will first be made using the steering wheel 1 shown in FIGS. 5 to 8, and the same parts will include the following:
The same symbols are attached.

1 and 2 show the state in which the slip ring 5 is fixed by the method of the present invention, and the upper end surface 7 of the inner side wall 6 of the slip ring fitting groove 4 on the lower surface of the back cover 3 has a A tapered caulking portion 11 that becomes higher toward the slip ring fitting groove 4 side is formed over the entire circumference, and a plurality of fixing portions 12 are formed by caulking multiple locations of this caulking portion 11 onto the slip ring 5. The slip ring 5 is sandwiched between the plurality of fixing parts 12 and the bottom part 9 of the slip ring fitting groove 4.

Each of these fixing parts 12 has a larger slip ring 5 than the fixing part 8 according to the conventional method shown in FIG.
The slip ring 5 is reliably fixed in the slip ring fitting groove 4.

That is, as shown in FIGS. 3 and 4, the caulking portion 1
1 with the caulking pin 13, since the tip of the caulking pin 13 is flat, the caulking pin 13 deforms from the highest part of the tapered caulking part 11, that is, the part on the slip ring fitting groove 4 side. It turns out. therefore,
The synthetic resin of the caulked part 11 will move a lot toward the slip ring fitting groove 4 side, and the formed fixing part 12 will be
The slip ring 50 largely protrudes in the plane direction, and
The wall thickness also increases. The pressure of the caulking pin 13 does not need to be particularly high, and it can be caulked with an appropriate pressure, so the formed fixing part 12I does not become brittle.
Has sufficient strength.

In this embodiment, the tapered caulking portion 11 is placed on the side of the annular slip ring fitting groove 4! l! 6 is formed on the entire circumference of the upper end surface 7 of the side wall 6, but it may be formed partially corresponding to the fixing portion 12. Also, the caulked portion 11 is not limited to the upper end surface 7 of the inner side wall 6, but is formed on the outer side wall 6. It may be formed on one end face of the side wall of the
Furthermore, it may be formed on both sides.

(Effects of the Invention) As described above, according to the present invention, it is possible to form a fixing part that is thick and largely protrudes in the direction of the slip ring, and the caulking pressure can also be set to an appropriate value, so that the fixing part does not become brittle. Therefore, the slip ring can be securely and firmly fixed in the slip ring fitting groove.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing a slip ring fixed state by the slip ring fixing method of the present invention, Fig. 2 is a perspective view thereof, and Figs. 3 and 4 are enlarged longitudinal cross-sectional views showing the states before and after caulking, respectively. FIG. 5 is a bottom view of the steering wheel, FIG. 6 is a vertical cross-sectional view showing how the slip ring is fixed by the conventional method, FIG. 7 is a perspective view thereof, and FIG. 8 is an enlarged vertical cross-section thereof. It is a diagram. 1. Steering wheel, 2. Boss portion, 4. Slip ring fitting groove, 5. Slip ring, 6. Side wall, 7. Upper end surface, 11. Caulking portion.

Claims (1)

[Claims] (1) Fit the slip ring into the annular slip ring fitting groove formed in the boss portion of the steering wheel, and caulk at least a portion of the upper end surface of the side wall of the slip ring fitting groove onto the slip ring to secure the slip ring. A slip ring fixing method for fixing a slip ring in a slip ring fitting groove, the slip ring fitting groove having a tapered caulking portion that becomes higher toward the slip ring fitting groove on at least a part of the upper end surface of the side wall of the slip ring fitting groove. A method for fixing a slip ring, the method comprising: forming a crimped portion, and crimping the crimped portion onto the slip ring.