JPS6343170Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a slip-off prevention structure for a static steering wheel in which the pad is held stationary by a planetary gear mechanism even when the steering wheel is rotated.

Prior Art When various switches, indicators, etc. are attached to the pad of a steering wheel of an automobile, if the pad rotates when the steering wheel is operated, it will cause inconvenience in operating the switches, checking the display, etc. Therefore, a planetary gear mechanism is used. This allows the pad portion to remain stationary even when the steering wheel is rotated. In the planetary gear mechanism, it is necessary to rotatably support the pad-side sun gear to which the pad is fixed relative to the boss of the boss plate of the steering wheel, and to prevent it from coming off the boss. Conventionally, the pad-side sun gear or pad portion is prevented from coming off by undercutting the pad-side sun gear onto the boss plate, or by tightening and fixing the boss plate to the steering shaft with a nut. However, when securing with an undercut, it is difficult to remove during maintenance, and when securing with a nut, a gap is required between the nut and the sun gear on the pad side or the contact surface of the pad part. There is an inconvenience that backlash occurs.

Purpose This invention was made to eliminate the above-mentioned conventional drawbacks, and the purpose is to provide a structure for preventing pads from coming off in static steering wheels, which is easy to remove during maintenance and does not cause rattling. be.

First Example The first example embodying this idea will be described below as the first example.
This will be explained according to Figure 2. Steering shaft 1
is rotatably supported by a bearing 3 while passing through the inside of the column 2, and a boss plate 4 is fastened and fixed to an end of the column 2 by a nut 5. As shown in FIG. 2, the boss plate 4 has a substantially octagonal shape when viewed from the front, and a steering wheel 7 is supported by two spokes 6 extending from both sides of its lower part. A plurality of bolts 9 (only one is shown) are attached to the end face of the column 2, with the column-side sun gear 8 having its center loosely penetrated through the steering shaft 1.
Fixed by

A pad side sun gear 1 having the same number of teeth as the column side sun gear 8 is attached to a boss portion 4a of the boss plate 4 protruding toward the steering wheel side.
0 is rotatably supported via a bearing 11. A protrusion 12 is integrally formed on the end face of the pad side of the pad side sun gear 10, and a plurality of pad parts 13 (one
It is fixed by bolts 14 (only one of which is shown in the figure). A tapered portion 15 is formed on the outer peripheral surface of the protruding portion 12, the diameter of which decreases toward the pad.

As shown in FIG. 2, mounting recesses 16 that open outward are formed at both upper and lower ends of the boss plate 4.
A pair of planetary shafts 19 integrally formed with planetary gears 17 and 18 meshing with the screw 20 are inserted.
Interposed member 21 fixed in mounting recess 16 by
It is rotatably supported by. Both planetary gears 17 and 18 have the same number of teeth, and rotate around the column side sun gear 8 and the pad side sun gear 10, respectively, as the boss plate 4 rotates by steering operation. It's becoming like that.

Planetary gear 18 meshing with pad side sun gear 10
A protrusion 22 is integrally formed on the end face of the pad side, and a tapered part 23 is formed on the outer circumferential surface of the protrusion 22, which abuts the tapered part 15 of the protrusion 12 of the pad side sun gear 10 and widens toward the pad side.

Next, the operation of the apparatus configured as described above will be explained.

Now, when the steering wheel 7 is rotated to perform a steering operation, the boss plate 4 is rotated, and each planetary gear 17, 18 is connected to the column side sun gear 8.
And it revolves around the pad side sun gear 10 while rotating. The column side sun gear 8 is fixed to the column 2, and the number of teeth of the column side sun gear 8 and the pad side sun gear 10 are the same, and both the planetary gears 17,
Since the number of teeth (18) is the same, the pad side sun gear 10 is in a stationary state, and the pad portion 13 fixed to the pad side sun gear 10 is always in a stationary state with respect to the column 2 regardless of steering operation. is maintained.

A protrusion 2 protruding from the planetary gear 18 on the pad side
2, when the planetary gear 18 revolves around the pad-side sun gear 10, the tapered portion 23 of the protruding portion 12 of the protruding portion 12 protrudes from the pad-side sun gear 10.
Since it is always in contact with 5, the sun gear 10 on the pad side
This will reliably prevent the material from coming off and will not cause rattling. Also, unlike when stopping with an undercut,
It is also easy to remove for maintenance.

Second Embodiment Next, a second embodiment of this invention will be described with reference to FIG. This embodiment is different from the first embodiment in the configurations of the pad-side sun gear 10 and the pad-side planetary gears 18. That is, in this embodiment, instead of forming tapered parts 15 and 23 on the protrusions 12 and 22 of the pad-side sun gear 10 and the pad-side planet gear 18, tapered parts 15 and 23 are formed on the tooth surfaces of the pad-side sun gear 10 and the pad-side planet gear 18. In order to form the tapered portions 15 and 23, a face gear is used for the pad-side sun gear 10, and a bevel gear is used for the pad-side planetary gear 18, respectively.

Therefore, this embodiment also exhibits the same effects as the previous embodiment.

Note that this invention is not limited to the above-described embodiments; for example, the planetary gears 17, 18 and the planetary shaft 19 may be formed separately. In this case, the planetary gears 17, 18 relative to the boss plate 4
The assembling work can also be carried out in a conventional manner. Also, the protrusion 22 of the pad side planetary gear 18
It is also possible to form a separate tapered roller and fix it to the planetary gear 18 with a screw. In this case, the planetary gear 18 can be easily formed, and the tapered roller can be made of another material such as an elastic body.

Effects As detailed above, this invention provides a pad-side sun gear with a tapered portion whose diameter decreases toward the pad, and at least one planetary gear that meshes with the pad-side sun gear contacts the taper portion to provide a pad-side sun gear. By providing a tapered portion that widens toward the side, it is easy to remove during maintenance, and the sun gear on the pad side can be reliably prevented from coming off, and there is an excellent effect that no rattling occurs.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing a first embodiment embodying this invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a partial view showing a second embodiment. FIG. Column...2, Boss plate...4, Column side sun gear...8, Pad side sun gear...10, Projecting part...12, 22, Pad part...13, Tapered part...15, 23, Planet Gears...17, 18.

Claims (1)

[Claims for Utility Model Registration] 1. The pad-side sun gear 10 is provided with a tapered portion 15 whose diameter decreases toward the pad, and at least one planetary gear 18 meshing with the pad-side sun gear 10 is provided with a tapered portion 15. A slip-off prevention structure for a static steering wheel with a pad portion, characterized in that a tapered portion 23 that abuts and widens toward the pad side is provided. 2. The pad portion stationary device according to claim 1, wherein both the tapered portions 15 and 23 are formed on the outer circumferential surfaces of the protruding portions 12 and 22 provided to protrude toward the pad side. A structure that prevents the steering wheel from falling out. 3. Utility model registration claim 2, characterized in that the protrusion 22 provided on the planetary gear 18 is formed separately from the planetary gear 18 and is fixed to the planetary gear 18 with a screw. A structure to prevent pads from falling off in static steering wheels. 4 Both the tapered parts 15 and 23 are connected to the planetary gear 1
8 and the tooth surface of the sun gear 10, the falling-out prevention structure in a stationary pad-type steering wheel according to claim 1, which is a registered utility model.