JP7229970B2 - steering wheel - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering wheel that adjusts the traveling direction of an automobile by operating a steering mechanism of an automobile by turning the steering wheel clockwise or counterclockwise by a required angle as viewed from the driver seated in the driver's seat. be. In particular, the present invention relates to a steering wheel equipped with a motor that generates vibrations to alert the driver.

In the present application, the "upper part" of the steering wheel means the part of the steering wheel on the ceiling side of the vehicle compartment in the straight running position, and the "lower part" of the steering wheel means the part on the floor side of the vehicle compartment. .

In recent years, the number of automobiles equipped with safe driving support systems is increasing. Of these, the lane departure warning system issues a warning to the driver when the driver is about to unconsciously stray from the lane, and prompts the driver to return to the correct driving position. These warnings include those that emit a warning sound, those that light a warning light, and those that vibrate the steering wheel.

As a warning, if a motor that generates vibration is attached to the spokes of the steering wheel when vibrating the steering wheel, the spokes must be made thicker, which limits the degree of freedom in designing the steering wheel. was there. In addition, since the vibration is transmitted not only to the rim portion of the steering wheel but also to the boss portion, the vibration transmitted to the rim portion is weakened.

Therefore, in order to solve the above problem, it has been proposed to attach a motor that generates vibration to the rim portion of the steering wheel (for example, Patent Documents 1 and 2).

Among them, Patent Document 1, as shown in FIG. , and a motor 5 that generates vibration is attached to the arm portion 4 . In FIG. 6, 6 indicates a spoke portion that connects the rim portion 2 and the boss portion 3, and the rim portion 2, the boss portion 3, and the spoke portion 6 have a metal core 7 serving as a framework. 8 denotes an eccentric weight attached to the rotating shaft 5a of the motor 5. As shown in FIG.

Further, in Patent Document 2, as shown in FIG. 7, a housing portion 9 for a motor 5 that generates vibration is formed on the side opposite to the driver in the lower portion of the rim portion 2, and a case 10 to which the motor 5 is fixed is attached to the housing portion. 9 with screws 17 and integrated with the rim portion 2.

The mounting of the motor 5 to the rim portion 2 disclosed in these Patent Documents 1 and 2 is for fixing in parallel with the rotating shaft 5a on both the left and right sides of a plane orthogonal to the longitudinal direction of the rotating shaft 5a of the motor 5. This is done by screwing in the screw 11 (see FIGS. 6(b), 6(c) and 7(b)). For this attachment, in Patent Document 1, a bracket 12 is provided on the arm portion 4 . Further, in Patent Document 2, the case 10 is provided with a wall portion 13 for fixing the motor 5 .

However, when the motor 5 is attached to the rim portion 2 by inserting and screwing the fixing screw 11 into the bracket 12 or the fixing wall portion 13 in parallel with the rotating shaft 5a of the motor 5, the vibration of the motor 5 is It is transmitted to the rim portion 2 via the fixing wall portion 13 .

In this case, if the rigidity of the bracket 12 and the fixing wall portion 13 is small, necessary vibration is damped by the bracket 12 and the fixing wall portion 13, and the transmission efficiency of the vibration is lowered.

JP 2017-7594 A JP 2017-214050 A

The problem to be solved by the present invention is that when the motor is attached to the rim using a fixing screw that is screwed in parallel with the rotation axis of the motor via a bracket or a fixing wall, The point is that if the rigidity of the portion is small, the transmission efficiency of vibration is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent deterioration of the transmission efficiency of vibrations by adopting a structure in which a motor is directly attached to a rim without using a bracket or a fixing wall.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering wheel that operates a steering mechanism of an automobile to adjust the traveling direction of the automobile. The steering wheel includes an annular rim portion, a boss portion disposed in the center of the rim portion, spoke portions connecting the rim portion and the boss portion, and a skeleton of the rim portion, the boss portion, and the spoke portions. It has a core metal that becomes

The present invention is a steering wheel in which a motor that generates vibration is attached to the rim portion, and is mainly characterized by the following configuration.

The motor has a first flat surface formed parallel to the rotation axis of the motor, and is formed substantially parallel to the first flat surface in a region opposite to the first flat surface across the rotation shaft. and a second flat surface. Then, in a state in which the first flat surface and the motor mounting flat surface formed on the core metal are brought into planar contact, the motor fixing screw is tightened in a direction perpendicular to the first flat surface. , the motor is attached to the core metal of the rim portion.

In the steering wheel of the present invention, the motor is attached to the rim portion by bringing the motor attachment plane provided on the core metal serving as the skeleton of the rim portion into planar contact with the first flat surface of the motor. This is done by tightening the fixing screw in the direction perpendicular to the plane. Therefore, the motor can be easily positioned with respect to the core bar without requiring a separate bracket or the like, and the reliability and strength of attachment of the motor to the core bar are improved. Moreover, since the motor is directly attached to the core bar, the transmission efficiency of vibration does not decrease.

In the present invention, the rotation axis of the motor is positioned closer to the center position between the first flat surface and the second flat surface on a straight line extending from the first flat surface through the rotation shaft to the second flat surface. It is desirable to be provided so as to be positioned above. With this configuration, the rotor and stator of the motor can be positioned above the motor, the gap between the first flat surface and the stator is increased, and the length of the fixing screw is increased. However, the possibility of the tip contacting the stator is reduced. In addition, since the lower portion of the cross section of the motor can be made small, there is no need to thicken the rim portion at the position where the motor is mounted, and the efficiency of transmitting vibration is not lowered.

Further, in the present invention, when the mounting portion of the motor to the rim portion is viewed in a cross section perpendicular to the rotation shaft of the motor, the length of the cross section of the first flat surface is equal to the length of the cross section of the first flat surface. It is desirable to make it shorter than the cross-sectional length of the two flat surfaces. With such a configuration, the area of the first flat surface is reduced, the contact area between the motor and the core bar is reduced, and the tightening pressure per unit area of the fixing screw is increased, enabling stronger attachment. At the same time, it is possible to prevent loosening of the fastening screws due to the rotation of the motor.

Moreover, in the present invention, it is preferable that the fixing screws are attached at least two points on a straight line obtained by projecting the rotating shaft of the motor onto the first flat surface. With such a configuration, the motor can be more firmly attached to the rim portion.

The positions of the fixing screws attached in at least two places are not limited to the straight line obtained by projecting the rotating shaft of the motor onto the first flat surface, but may be in the vicinity of the corner portion of the first flat surface.

Specifically, the vicinity of a corner portion located in a line-symmetrical or point-symmetrical position with respect to a straight line obtained by projecting the rotation axis onto the first flat surface, or a straight line obtained by projecting the rotation axis onto the first flat surface. It is attached near the corner portion on either side of the split sides.

Among the above, when it is attached near the corner portion located at the line-symmetrical position, it is possible to effectively suppress the movement of the motor in the direction orthogonal to the rotation axis of the motor. Moreover, if there is an eccentric weight attached to the rotating shaft of the motor on the side of the fixing screw at the attachment position, the influence of the rotational moment due to the eccentric weight can be minimized. Conversely, when the eccentric weight is present on the side opposite to the mounting position of the fixing screw, the effect on the rotational moment is limited, but the ease of mounting the motor to the core bar is improved.

In addition, when the motor is installed near the corner portion located at the point-symmetrical position, it is possible to effectively suppress the movement of the motor in both the longitudinal direction of the rotation shaft of the motor and the direction orthogonal to the rotation shaft. can be done.

Further, when the rotating shaft rotates in only one direction, of the two sides divided by the straight line projecting the rotating shaft onto the first flat surface, the corner portion on the side that tends to separate due to the rotation is provided. It can be fixed more effectively when installed.

In the present invention, the attachment of the motor to the core metal serving as the framework of the rim portion is achieved, for example, by forming a female thread on the first flat surface of the motor that faces the motor attachment plane of the core metal on which the motor is attached, Install by screwing a fixing screw into the female thread.

Further, in the present invention, the motor may be attached to an extension plate extending from the core metal of the rim toward the boss instead of being directly attached to the metal core serving as the skeleton of the rim. With such a configuration, the vibration of the motor is amplified by the extension plate extending cantilever from the core metal toward the boss, so that the rim can be vibrated more effectively.

According to the present invention, the motor is mounted on the rim of the steering wheel by bringing the motor mounting plane provided on the core metal serving as the frame of the rim into planar contact with the first flat surface of the motor. This configuration is performed by tightening a fixing screw in a direction perpendicular to the surface. That is, the motor can be easily positioned with respect to the metal core without requiring a separate bracket or the like. In addition, the reliability and strength of mounting the motor to the core metal are improved. Furthermore, since the motor is directly attached to the core bar, the efficiency of transmission of vibration does not decrease.

1 is a vertical cross-sectional view showing a first embodiment of a configuration for mounting a motor to a rim portion of a steering wheel according to the present invention; FIG. FIG. 1B is a view taken along line AA of FIG. 1A; FIG. 1B is an arrow view BB of FIG. 1A. FIG. 6 is a vertical cross-sectional view showing a second embodiment of the mounting structure of the motor to the rim portion of the steering wheel according to the present invention; FIG. 2B is an AA view of FIG. 2A; 4(a) to 4(c) are diagrams for explaining other examples of screwing positions of fixing screws when attaching a motor to the rim portion of the steering wheel of the present invention. FIG. FIG. 10 is a schematic diagram showing a third embodiment of the structure for mounting a motor to the rim portion of the steering wheel according to the present invention; FIG. 5 is a diagram showing a configuration to be compared with the third embodiment shown in FIG. 4, and is a schematic diagram showing a case where the motor is attached to the rim while the motor is fixed to the bracket attached to the extension plate. It is a diagram for explaining the steering wheel proposed in Patent Document 1, (a) is a view when viewed from the driver side, (b) is an enlarged view of the mounting portion of the motor to the rim portion, and (c) is an enlarged view of the motor. It is explanatory drawing of an attachment part. It is a figure explaining the steering wheel proposed by patent document 2, (a) is a figure when it sees from the anti-driver side, (b) is a motor attached to the case attached to the housing part of the motor formed in the rim part. It is the figure which showed the state.

SUMMARY OF THE INVENTION An object of the present invention is to provide a steering wheel in which a motor that generates vibration is attached to the rim. to keep it from declining.

According to the present invention, the motor is mounted on the rim of the steering wheel by bringing the motor mounting plane provided on the core metal serving as the frame of the rim into planar contact with the first flat surface of the motor. By tightening the fixing screw in the direction perpendicular to the plane, the above object was achieved.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG.
(First embodiment: FIGS. 1A to 1C)
FIG. 1A is a vertical cross-sectional view showing a first embodiment of the mounting structure of the motor 5 to the rim portion 2 constituting the steering wheel 1 of the present invention, FIG. FIG. 1B is an arrow view BB of FIG. 1A.

The steering wheel 1 of the present invention includes an annular rim portion 2, a boss portion 3 arranged in the central portion of the rim portion 2, spoke portions 6 connecting the rim portion 2 and the boss portion 3, and these rims. A core metal 7 serving as a skeleton of the portion 2, the boss portion 3, and the spoke portion 6 is provided (see FIGS. 6 and 7).

The present invention is used, for example, when attaching a motor 5 having an eccentric weight 8 attached to a rotary shaft 5a to a portion of a core metal 7 serving as a skeleton of a rim portion 2 constituting a steering wheel 1, which is positioned below the rim portion 2. , which has the following structure:

The case 5b of the motor 5 has a first flat surface 5c formed parallel to the longitudinal direction of the rotating shaft 5a of the motor 5, and a region opposite to the first flat surface 5c across the rotating shaft 5a. It has a formed second flat surface 5d. The second flat surface 5d is formed parallel to the first flat surface 5c in the first embodiment shown in FIGS. 1A to 1C. If it does not abut, it does not have to be formed parallel to the first flat surface 5c.

Further, in the first embodiment, the first flat surface 5c and the above-mentioned flat surface 5c and the above-mentioned flat surface 5d are formed on a straight line passing through the rotating shaft 5a and perpendicular to the first flat surface 5c and the second flat surface 5d, for example. It is located above the intermediate position between the second flat surfaces 5d. That is, when the distance between the first flat surface 5c and the rotating shaft 5a is H1, and the distance between the rotating shaft 5a and the second flat surface 5d is H2, H1>H2.

In addition, in the first embodiment, the cross-sectional length L1 of the first flat surface 5c when viewed in a cross-section orthogonal to the longitudinal direction of the rotating shaft 5a of the motor 5 is defined by the second flat surface. It is shorter than the cross-sectional length L2 of 5d.

On the other hand, a motor mounting plane 7a (a hatched area in FIG. 1B) is formed at the mounting portion of the motor 5 on the core bar 7 positioned below the rim portion 2. The motor 5 is attached to the metal core 7 while the first flat surface 5c is in planar contact.

At this time, in the first embodiment, the first flat surface 5c of the motor 5 is formed with, for example, two internal threads 5ca so as to be perpendicular to the first flat surface 5c. Needless to say, the internal thread 5ca is not required to be exactly perpendicular to the first flat surface 5c, and may be inclined within the range of manufacturing error.

In the first embodiment, the internal thread 5ca is provided on a straight line obtained by projecting the rotating shaft 5a of the motor 5 onto the first flat surface 5c. The motor 5 is attached to the core metal 7 by screwing fixing screws 14 inserted into, for example, two holes 7b provided in the motor attachment plane 7a into the female screws 5ca and tightening them.

In the steering wheel 1 of the present invention, the motor mounting flat surface 7a provided on the core metal 7 serving as the skeleton of the rim portion 2 and the first flat surface 5c of the motor 5 are brought into planar contact with each other so that the first flat surface 5c is perpendicular to the flat surface 5c. The motor 5 is attached to the rim portion 2 by tightening the fixing screw 14 in the direction of .

Therefore, compared with the steering wheels disclosed in Patent Documents 1 and 2, the following operational effects are obtained.
- The motor 5 can be easily positioned with respect to the metal core 7 without requiring a bracket or the like.
・Reliability and strength of attachment of the motor 5 to the metal core 7 are improved.
・Since the motor 5 is directly attached to the core metal 7, the transmission efficiency of vibration does not decrease.

In addition, in the first embodiment, the motor 5 is attached to the metal core 7 at two points on a straight line obtained by projecting the rotating shaft 5a of the motor 5 onto the first flat surface 5c. The reliability and strength of attachment to the rim portion 2 are further improved.

Further, in the first embodiment, since the rotating shaft 5a of the motor 5 is positioned above the intermediate position between the first flat surface 5c and the second flat surface 5d, the rotor 5f and the stator 5e are positioned inside the case 5a. will be located above the Therefore, the gap between the first flat surface 5c and the stator 5e is increased, and even if the fixing screw 14 is made longer, the possibility that the tip of the fixing screw 14 comes into contact with the stator 5e is reduced. In addition, since the lower portion of the cross section of the motor 5 can be made small, there is no need to thicken the mounting portion of the motor 5 on the rim portion 2, and the vibration transmission efficiency is not lowered.

(Second embodiment: FIGS. 2A and 2B)
FIG. 2A is a vertical cross-sectional view showing a second embodiment of the mounting structure of the motor 5 to the rim portion 2 constituting the steering wheel 1 of the present invention, and FIG. 2B is a view taken along arrows AA in FIG. 2A.

In the second embodiment shown in FIGS. 2A and 2B, the rotating shaft 5a of the motor 5 is arranged on a straight line passing through the rotating shaft 5a and perpendicular to the first flat surface 5c and the second flat surface 5d. The difference from the first embodiment is that it is provided at an intermediate position between the first flat surface 5c and the second flat surface 5d. That is, the distance H1 between the first flat surface 5c and the rotating shaft 5a and the distance H2 between the rotating shaft 5a and the second flat surface 5d are set to the same value (H1=H2).

In the case of the second embodiment, compared with the first embodiment, the ratio of reducing the lower portion of the cross section of the motor 5 (the length L1 of the cross section of the first flat surface 5c is reduced by the length L1 of the second flat surface 5d). of the cross-sectional length L2) becomes smaller. In addition, it becomes difficult to provide a margin in the length of the fixing screw 14 .

However, the motor 5 can be mounted without thickening the mounting portion of the motor 5 on the rim portion 2, and if there is no need to provide a margin in the length of the fixing screw 14, instead of the first embodiment, A second embodiment may be adopted.

(Another example of the screwing position of the fixing screw 14: FIG. 3)
FIGS. 3(a) to 3(c) are diagrams for explaining other examples of screwing positions of the fixing screws 14 when the motor 5 is attached to the rim portion 2 of the steering wheel 1 of the present invention.

In the first embodiment and the second embodiment, the motor 5 is mounted on the motor mounting flat surface 7a of the core metal 7 by the fixing screws 14, and the rotating shaft 5a of the motor 5 is mounted on the first flat surface 5c. This is done at two points on the projected straight line.

However, the position at which the fixing screw 14 is screwed is not limited to the straight line obtained by projecting the rotating shaft 5a of the motor 5 onto the first flat surface 5c as in the first and second embodiments. It may be in the vicinity of the corner portion of the flat surface 5c.

For example, as shown in FIG. 3(a), the rotation shaft 5a of the motor 5 may be mounted in the vicinity of the corner portion located symmetrically with respect to the straight line projected onto the first flat surface 5c. Alternatively, as shown in FIG. 3(b), the rotating shaft 5a may be attached near a corner portion located point-symmetrically with respect to a straight line projected onto the first flat surface 5c. Alternatively, as shown in FIG. 3(c), the rotating shaft 5a may be attached near the corner portion on either one of the two sides divided by the straight line projected onto the first flat surface 5c. .

When attached at the positions shown in FIGS. 3(a) to 3(c), the following effects are obtained.
When installed in the position shown in Figure 3(a):
- The movement of the motor 5 in the direction perpendicular to the longitudinal direction of the rotating shaft 5a of the motor 5 can be effectively suppressed.
If the eccentric weight 8 attached to the rotating shaft 5a of the motor 5 is present on the side of the fixing screw 14 at which the fixing screw 14 is attached, the influence of the rotational moment due to the eccentric weight 8 can be minimized.
・When the eccentric weight 8 exists on the side opposite to the mounting position of the fixing screw 14, the effect on the rotational moment is limited, but the ease of mounting the motor 5 to the core bar 7 is increased. improves.

When installed in the position shown in Figure 3(b):
Movement of the motor 5 in both the longitudinal direction of the rotation shaft 5a of the motor 5 and the direction orthogonal to the rotation shaft 5a can be effectively suppressed.

When installed in the position shown in Figure 3(c):
When the rotating shaft 5a of the motor 5 rotates in only one direction, the motor 5 can be more effectively fixed by mounting it near the corner portion on the side where it tends to move away due to the rotation.

(Third embodiment: FIG. 4)
FIG. 4 is a schematic diagram showing a third embodiment of the mounting structure of the motor 5 to the rim portion 2 constituting the steering wheel 1 of the present invention.

In the third embodiment shown in FIG. 4, unlike the first and second embodiments, an extension plate 15 directed toward the boss portion 3 is attached to the core metal 7 by, for example, fixing screws 16, and the extension plate 15 is The motor 5 is attached to the .

In the third embodiment as well, a fixing screw 14 is inserted into a position facing the female screw 5ca of the flat portion 15a of the extension plate 15 which is in surface contact with the first flat surface 5c formed on the case 5b of the motor 5. A hole 15b is formed.

In the third embodiment, if the screwing position of the fixing screw 14 and the vertical position of the rotary shaft 5a of the motor 5 are the same as in the first embodiment, the same effects as in the first embodiment are obtained. play. Further, when the screwing position of the fixing screw 14 and the vertical position of the rotating shaft 5a of the motor 5 are the same as those of the second embodiment, the same effects as those of the second embodiment are obtained. Further, when the screwing position of the fixing screw 14 is set to the positions shown in FIGS.

In addition, in the case of the third embodiment, the vibration of the motor 5 is amplified by the extension plate 15 extending cantilever from the core metal 7 of the rim portion 2, so that the rim portion 2 can be vibrated more effectively. can be done.

Further, when the motor 5 is attached to the extension plate 15 by inserting and screwing the fixing screw 11 into the bracket 12 attached to the flat portion 15a of the extension plate 15 in parallel with the rotating shaft 5a of the motor 5 (see FIG. 5). ), the vibration intensity of the motor 5 was improved by 2%.

It goes without saying that the present invention is not limited to the above examples, and the embodiments may be changed as appropriate within the scope of the technical ideas described in each claim.

That is, the steering wheel described above is a preferred example of the present invention, and embodiments other than this are also included. The present invention is not limited to the shape, size, arrangement, etc. of the parts shown in the accompanying drawings, unless specifically stated otherwise in this specification. Also, the phraseology and terminology used herein are for the purpose of description and should not be construed as limiting unless otherwise specified.

For example, in the first to third embodiments, the motor 5 is attached to the lower portion of the rim portion 2. However, if the operation of the steering wheel 1 is not hindered, the rim portion 2 may be mounted on the upper portion of the rim portion 2 or the like. The motor 5 may be attached at any position.

Further, in the first to third embodiments, the motor 5 is vibrated by attaching the eccentric weight 8 to the rotating shaft 5a of the motor 5. However, if the motor itself vibrates, the eccentric weight is unnecessary. .

In the first to third embodiments, the fixing screw 14 is used to attach the motor 5 to the core metal 7 at two locations. One place is fine. Conversely, if there is no problem with the space required for installation, work time, etc., three or more may be used. When mounting at three or more positions, the mounting positions shown in FIGS. 3(a) to 3(c) may be combined.

REFERENCE SIGNS LIST 1 steering wheel 2 rim portion 3 boss portion 5 motor 5a rotating shaft 5c first flat surface 5ca female screw 5d second flat surface 6 spoke portion 7 core metal 7a motor mounting plane 14 fixing screw 15 extension plate

Claims (8)

An annular rim portion, a boss portion arranged in the center portion of the rim portion, spoke portions connecting the rim portion and the boss portion, and a core metal serving as a skeleton of the rim portion, the boss portion, and the spoke portions. A steering wheel having a motor that generates vibration attached to the rim,
The motor has a first flat surface formed parallel to the rotation shaft of the motor, and a region opposite to the first flat surface across the rotation shaft and formed substantially parallel to the first flat surface. and a second flat surface, and in a state where the first flat surface and a motor mounting flat surface formed on the core bar are in planar contact, the motor is mounted in a direction perpendicular to the first flat surface. attaching the motor to the rim by tightening the fixing screw ;
When the mounting portion of the motor to the rim portion is viewed in a cross section orthogonal to the rotation shaft of the motor, the cross section length of the first flat surface is equal to the cross section length of the second flat surface. A steering wheel characterized by being shorter than the length . The rotating shaft of the motor is positioned above a center position between the first flat surface and the second flat surface on a straight line extending from the first flat surface through the rotating shaft to the second flat surface. 2. A steering wheel according to claim 1, wherein the steering wheel is arranged to 3. The steering wheel according to claim 1, wherein said fixing screw is attached at least two points on a straight line obtained by projecting said rotating shaft of said motor onto said first flat surface. 3. The steering wheel according to claim 1, wherein said fixing screws are attached to at least two locations near corner portions of said first flat surface. The corner portion of the first flat surface is symmetrical with respect to a straight line obtained by projecting the rotation axis onto the first flat surface, or at an arbitrary point on a straight line obtained by projecting the rotation axis onto the first flat surface. 5. The steering wheel according to claim 4, which is positioned symmetrically with respect to the steering wheel. An annular rim portion, a boss portion arranged in the center portion of the rim portion, spoke portions connecting the rim portion and the boss portion, and a core metal serving as a skeleton of the rim portion, the boss portion, and the spoke portions. A steering wheel having a motor that generates vibration attached to the rim,
The motor has a first flat surface formed parallel to the rotation shaft of the motor, and a region opposite to the first flat surface across the rotation shaft and formed substantially parallel to the first flat surface. and a second flat surface, and in a state where the first flat surface and a motor mounting flat surface formed on the core bar are in planar contact, the motor is mounted in a direction perpendicular to the first flat surface. attaching the motor to the rim by tightening the fixing screw;
The fixing screws are attached to at least two locations near the corner portions of the first flat surface,
A steering wheel according to claim 1, wherein the corner portion of the first flat surface is located on one of two sides divided by a straight line projecting the rotation axis onto the first flat surface. The motor is attached to the rim portion by forming a female thread on the first flat surface of the motor that faces the motor-attaching flat surface of the core metal on which the motor is attached, and screwing a fixing screw into the female thread. A steering wheel according to any one of claims 1 to 6, characterized in that it is mounted by: 8. The motor according to any one of claims 1 to 7, wherein the motor is attached to an extension plate extending from a metal core serving as a skeleton of the rim toward the boss. steering wheel.

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