JPH0241455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a steering wheel having a non-rotating pad using a planetary gear mechanism, and more particularly to the structure of a boss plate for mounting a bearing member of a planetary member.

Prior Art Conventionally, in a non-rotating pad steering wheel using a planetary gear mechanism, as shown in FIGS. 1 and 2, sun gears 51 on the column side and pad side,
52 to the boss 5 via bearings 53 and 54, respectively.
It was installed on the outer circumference of 5. On the other hand, the same sun gear 5
The column-side and pad-side planetary gears 56 and 57 that mesh with gears 1 and 52 are attached to a planetary shaft 58, and the planetary shaft 58 is inserted through a bearing member 59 into a mounting recess 6 formed in the edge of the boss plate 60.
It was installed inside 1. That is, the sun gear 51,
52 is installed at a right angle to the boss 55, and the planetary gear shaft 58 is installed at a right angle to the boss plate 60. Therefore, if the perpendicularity between the boss 55 and the boss plate 60 is low, the planetary gear 5 will be
6 and 57 will be inclined and interlock. Therefore, it was necessary to increase the squareness angle.

However, in order to simplify manufacturing and reduce costs, it is common practice to form the boss 55 and the boss plate 60 separately, and to fix the boss plate 60 by welding on the outer circumferential surface of the boss 55 at approximately the center in the axial direction. Therefore, the two are integrated. Therefore, due to errors during welding, distortion due to welding heat, etc., the perpendicularity is reduced, causing rattling and abnormal noise in the gear, and, as a result, there is a risk that the pad portion may vibrate.

Purpose of the Invention This invention was made to solve the above-mentioned problems, and its purpose is to correct the perpendicularity between the boss and the boss plate so that the planetary gear shaft can be moved relative to the boss plate. A new steering wheel that can be installed parallel to the axial direction of the boss, and can therefore mesh the planetary gear parallel to the sun gear to prevent rattling of the gears, generation of abnormal noise, and vibration of the pad part. Our goal is to provide wheels.

Structure of the Invention In the steering wheel of the present invention, an injection part formed by injection molding of synthetic resin is provided on the edge of the boss plate, a mounting recess for fitting the bearing member of the planetary member is formed in the injection part, and the mounting The inner surface of the recess is formed parallel to the axial direction of the boss, and the front and rear surfaces of the injection part, which are in contact with the flange of the bearing member, are formed perpendicular to the axial direction of the boss. It is.

Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to FIGS. 3 to 7.

In the drawing, reference numeral 1 denotes a column of an automobile, into which a steering shaft 2 passes and projects forward. 3 is a boss fixed to the tip of the steering shaft 2 with a nut 4. Reference numeral 5 designates a boss plate welded and fixed onto the outer circumferential surface of the boss 3 at approximately the center in the axial direction.

Reference numeral 6 denotes a rectangular recess formed in two places on the edge of the boss plate 5, around which an emitted part 7 formed with a slightly thinner wall is provided; 7 is provided with a through hole 7a. Reference numeral 8 denotes an injection part formed by injection molding polyamide resin so as to cover both surfaces of the injection target part 7 and the recess 6, and the front and rear surfaces thereof are made to be exactly perpendicular to the axial direction of the boss 3. It is formed. Since the injection portion 8 also extends into the through hole 7a, it is prevented from coming off. Reference numeral 9 denotes a rectangular mounting recess formed by the injection part 8, and the inner surface 29 thereof is provided to be exactly parallel to the axial direction of the boss 3. Reference numeral 10 denotes a spring storage recess provided at the edge of the boss plate 5 adjacent to the mounting recess 9, and further adjacent thereto is a hook-shaped hook-shaped recess 1.
1 is notched. Reference numeral 12 denotes a ring portion for performing a steering operation, and is supported by a single spoke 13 that extends integrally from the boss plate 5.

14 is a bearing 1 on the outer periphery of the boss 3 on the column side.
It is a column-side sun gear mounted so as to be rotatable relative to the column 1 via the column 1, and is fixed to the end face of the column 1 with a locking bolt 16 so as not to rotate with respect to the column 1. Reference numeral 17 denotes a pad-side sun gear mounted on the pad-side outer periphery of the boss 3 through a bearing 18 so as to be relatively rotatable, and is formed to have the same diameter and the same number of teeth as the column-side sun gear 14. Reference numeral 19 denotes a pad portion attached to the front end surface of the pad side sun gear 17 with bolts 20, and is used for various switches,
Electronic devices (not shown) such as a sound generator and a display can be attached to the device.

Reference numeral 21 denotes two planetary shafts rotatably mounted in the mounting recess 9 of the injection section 8 by bearing members described later. Reference numerals 22 and 23 denote column-side and pad-side planetary gears which are formed to have the same diameter and the same number of teeth and are attached to both ends of each planetary shaft 21 by means of splines, crimping, screwing, etc., respectively. It meshes with sun gears 14 and 17 on the column and pad sides, allowing it to revolve while rotating. Here, the planetary shaft 21 and the planetary gears 22 and 23 attached thereto will be collectively referred to as a planetary member 24.

Reference numeral 25 denotes a bearing member for pivotally supporting and locking the planetary member 24, which is made of polyacetal resin and is fitted into the mounting recess 9. 26
is a U-shaped holding groove recessed inside the bearing member 25, the bottom of which contacts the planetary shaft 21 as a sliding bearing.

Reference numeral 27 denotes a flange portion integrally formed to protrude upward and downward from both sides of the bearing member 25, and both front and rear surfaces of the injection portion 8 are sandwiched between the upper and lower flange portions 27 so as to be in contact with each other. Reference numeral 28 denotes a side surface portion exposed between the flanges 27 on both sides of the bearing member 25, and is fitted into the mounting recess 9 so as to come into contact with both inner side surfaces 29 thereof. Therefore, the holding groove 2 of the bearing member 25
6 does not become the injection part 8 and extends parallel to the axial direction of the boss 3. Reference numeral 30 indicates two guide grooves provided on the outer surface of the bearing member 25.

Further, both front and rear end surfaces of the bearing member 25 are connected to each planetary gear 2.
The position of the gears 22, 23 is regulated by contacting the inner end surfaces of the gears 22, 23.

Reference numeral 31 denotes a biasing member made of a metal wire that is stretched around the bearing member 25. A U-shaped hooking portion 32 is bent at one end and is hooked into the hooking recess 11. Reference numeral 33 denotes a pair of wire portions extending from the hook portion 32, and a coil spring 34 that fits in the spring storage recess 10 is integrally formed in the middle of each wire portion. Reference numeral 35 denotes a hook formed in a curved manner at the tip of each wire portion 33, and is hooked to a locking pin 36 protruding from both sides of the boss plate 5.

Due to the elastic force of the coil spring 34, the wire portion 33 of the biasing member 31 is stretched around the guide groove 30 of the bearing member 25 in a mountain shape under tension. It is urged toward the bottom of the mounting recess 9. Therefore, each of the planetary gears 22 and 23 is always pressed against the sun gears 14 and 17, so that backlash between the gears is suppressed.

Next, a method of assembling the steering wheel configured as described above will be explained.

First, the boss plate 5 is formed by an easy processing method such as press working, and at the same time, the recesses 6 and the like are provided.
Next, the boss plate 5 is fitted onto the outer circumferential surface of the substantially central portion of the boss 3 in the axial direction, and after the two are positioned substantially at right angles, they are fixed by welding. At this time, generally the perpendicularity between the boss plate 5 and the boss 3 tends to vary due to errors during welding, distortion due to welding heat, etc., and it is difficult to obtain a high perpendicularity. In this embodiment, the perpendicularity angle is assumed to be low.

Next, the boss 3 and the boss plate 5 are set in a mold (not shown) of an injection molding machine with the axis of the boss 3 as a reference, and both sides of the injection part 8 are set at exactly right angles to the axis of the boss 3. The injection part 8 is injection molded so that the inner surface 29 of the mounting recess 9 is exactly parallel.

Next, the planetary gears 2 are attached to both ends of the planetary shaft 21.
After attaching 2 and 23 to form the planet member 24,
The planetary shaft 21 is fitted into the holding groove 26, and the inner end surfaces of the planetary gears 22 and 23 are brought into contact with both end surfaces of the bearing member 25. Subsequently, both the members 24 and 25 are fitted into the mounting recess 9 of the boss plate 5 so that the inner surface of the flange 27 comes into contact with both the front and rear surfaces of the injection part 8, and each planetary gear 22, 23
mesh with the sun gears 14 and 17. Therefore, since the bearing member 25 follows the injection part 8, the holding groove 26
The planetary shaft held therein extends parallel to the axial direction of the boss 3, and the planetary gears 22 and 23 mesh with the sun gears 14 and 17 in parallel. Therefore, rattling of the gears, generation of abnormal noises, and vibration of the pad portion 19 can be prevented.

Next, attach the hook 35 of the biasing member 31 to the locking pin 3.
6, the wire portion 33 is stretched over the guide groove 30 of the bearing member 25 while the coil spring 34 is extended, and the hook portion 32 is hooked in the hook recess 11.

Now, when the steering wheel of this embodiment is rotated, the planetary gears 22 and 23 rotate and revolve while being pressed by the sun gears 14 and 17 as described above, so that the pads fixed to the pad side sun gear 17 Like the column side sun gear 14, the portion 19 does not rotate relative to the column 1. Furthermore, since the backlash between the gears is absorbed by being compressed, backlash due to backlash can be prevented.

Note that the present invention is not limited to the configuration of the embodiment described above, and may be embodied as follows, for example.

(1) The injection part 8 is made of polyacetal, polyester,
Formed from various synthetic resins such as ABS, polypropylene, and methacrylic. In addition, bearing member 2
5 can also be formed from various synthetic resins such as polyester, ABS, methacrylic, and polyamide.

(2) Protrusions to prevent the injection part 8 from coming off are provided on the injection target part 7. Further, the emitted portion 7 does not have to be made thin.

(3) The boss 3 and the boss plate 5 are not limited to those fixed by welding, but various structures such as those integrally formed from sheet metal can be used.

Effects of the Invention As detailed above, the present invention provides an injection part formed by injection molding of synthetic resin on the edge of the boss plate, and forms a mounting recess for fitting the bearing member of the planetary member in the injection part. The inner surface of the mounting recess is formed parallel to the axial direction of the boss, and both the front and rear surfaces of the injection part, which contact the flange of the bearing member, are formed perpendicular to the axial direction of the boss. Even if the perpendicularity between the front gear and the boss plate is low, this can be corrected and the planetary shaft can be mounted parallel to the boss plate, and the planetary gear can be meshed parallel to the sun gear to prevent gear play. This has excellent effects in that it can prevent the occurrence of abnormal noises and vibrations of the pad portion.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing a conventional steering wheel, Fig. 2 is an exploded front view of the main parts, Fig. 3 is a partially cutaway side view showing an embodiment embodying the present invention, and Fig. 4 is a partially cutaway side view showing a conventional steering wheel. Also an exploded front view of main parts, No. 5
The figure is a cross-sectional view of the boss plate taken along the line A-A in Figure 4, Figure 6 is a perspective view of the main part showing the injection part of the boss plate, etc., and Figure 7 is the main part showing the injection part, bearing member, etc. FIG. Boss...3, boss plate...5, injection part...8, mounting recess...9, planet member...24, bearing member...25,
Tsubabe…27.

Claims (1)

[Claims] 1. In a steering wheel in which the pad portion is made non-rotatable by a planetary gear mechanism, an injection portion 8 is formed by injection molding synthetic resin onto the edge of the boss plate 5.
The bearing member 2 of the planetary member 24 is provided in the injection part 8.
5. A steering wheel characterized in that a mounting recess 9 is formed for fitting the steering wheel. 2. The inner surface 29 of the mounting recess 9 is formed parallel to the axial direction of the boss 3, and the front and rear surfaces of the injection part 8, which are in contact with the flange 27 of the bearing member 25, are formed perpendicular to the axial direction of the boss 3. A steering wheel according to claim 1, characterized in that the steering wheel is formed by: 3. The steering wheel according to claim 1, wherein the boss plate 5 and the boss 3 are fixed by welding. 4 A rectangular recess 6 is provided at the edge of the boss plate 5, and a thin ejection target portion 7 is provided on both sides of the recess 6.
The steering wheel according to claim 1 or 2, characterized in that the injection part 8 is provided so as to cover the concave part 6 and the injection target part 7.