JP2021155021A - Steering wheel - Google Patents

Abstract

To provide a steering wheel which can appropriately suppress temperature rise of a control device to be mounted.SOLUTION: A steering wheel W includes: a ring section R to be gripped at time of steering; a boss section B arranged at a center of the ring section; and a spoke section S for connecting the ring section and the boss section to each other. The steering wheel is configured to dispose a control device 40 rising in a temperature at the time of an operation. The steering wheel W includes a metallic core metal 1 for connecting the ring section, the boss section, and the spoke section. The core metal has a ring core metal section 2 disposed in the ring section, a boss core metal section 3 disposed in the boss section, and a spoke core metal section 6 disposed in the spoke section so as to connect the ring core metal section to the boss core metal section. The control device 40 is disposed by using the core metal 1 as a radiator and connecting the control device to the core metal 1. In the core metal 1, an abutting surface 12 for heat conduction is disposed to be brought into surface contact with the control device side for conducting heat.SELECTED DRAWING: Figure 4

Description

The present invention relates to a steering wheel equipped with a control device that raises the temperature during operation, and more particularly to a steering wheel that can suppress the temperature rise of the control device.

Conventionally, the steering wheel that is steered when the vehicle is running is subjected to determination processing such as controlling the temperature of the ring portion gripped by the driver or determining whether or not the vehicle is driving properly from the image data of the driver. In some cases, a control device that performs various controls is installed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-153271

However, in the steering wheel equipped with the conventional control device, it is inevitable that the temperature rise of the control device due to the load during operation, and it is desired to suppress the temperature rise of the control device appropriately, and there is room for improvement. there were. By the way, it is conceivable to install a heat sink for heat dissipation around the control device, but due to the bulkiness, the steering wheel with limited space has a contact surface for heat dissipation (contact surface for heat conduction). It was difficult to adopt a configuration in which the control device and the heat sink, etc. are mounted in mutual contact while ensuring a wide range of conditions.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a steering wheel capable of suitably suppressing a temperature rise of a mounted control device.

The steering wheel according to the present invention includes a ring portion to be gripped at the time of steering, a boss portion arranged at the center of the ring portion, and a spoke portion connecting the ring portion and the boss portion, and at the time of operation. A steering wheel configured by arranging a control device that raises the temperature.
A metal core metal for connecting the ring portion, the boss portion, and the spoke portion is provided.
The control device is arranged by connecting the core metal as a heat radiating body to the core metal.
The core metal is characterized in that it is configured by disposing a heat conduction contact surface that makes surface contact with the control device side to conduct heat.

In the steering wheel according to the present invention, the control device that raises the temperature during operation is arranged by using the core metal as a radiator and in surface contact with the heat conduction contact surface of the core metal. However, it is conducted by the core metal to suppress the temperature rise of the control device. Then, the core metal connecting the control device extends from the heat conduction contact surface connected to the control device to other parts of the steering wheel, and can efficiently dissipate heat, so that the control device rises. The temperature can be suppressed.

Therefore, in the steering wheel according to the present invention, the heat of the control device can be smoothly conducted to the core metal to dissipate heat, and the temperature rise of the mounted control device can be suitably suppressed.

Then, in the steering wheel according to the present invention, the core metal includes a plate-shaped connecting portion.
The connecting portion is provided with the heat conduction contact surface and is connected to the control device, and the surface opposite to the heat conduction contact surface is exposed and arranged. desirable.

In such a configuration, the plate-shaped connecting portion provided with the heat conduction contact surface for connecting the control device transfers the heat conducted to the heat conduction contact surface to be brought into contact with the control device side in addition to the core metal. Since it can function as a heat radiating plate that dissipates heat from the surface opposite to the heat conduction contact surface in addition to conducting heat to the portion of the above, it is possible to more preferably suppress the temperature rise of the control device.

Further, in the steering wheel according to the present invention, the core metal includes a ring core metal portion arranged on the ring portion, a boss core metal portion arranged on the boss portion, and the ring core metal portion and the ring core metal portion. It is configured to include a spoke core metal portion, which is arranged on the spoke portion so as to connect with the boss core metal portion.
The spoke core metal part
A branch rod portion that is separated from each other with a gap between the ring core metal portion and the boss core metal portion is provided.
The connecting portion may be arranged so as to connect the branch rod portions to each other.

In such a configuration, the plate-shaped connecting portion provided with the heat conduction contact surface for connecting the control device functions as the heat sink itself, and the two branch rods separated from each other in the spoke core metal portion. It is also possible to conduct heat to the branching rods on both sides by arranging the heat sinks so as to straddle the two, and more preferably, the temperature rise of the control device can be suppressed. The spoke core for connecting the control device is a core that connects the ring core of the ring that is gripped when the driver steers the steering wheel and the boss core of the boss in the center of the ring. A gold part that is connected to a ring part that coats a coating layer such as urethane around the core metal part (ring core metal part), or is connected to the steering shaft (steering shaft) of a vehicle, or an airbag. Unlike the boss part on which the device is mounted, it is easy to secure space. Furthermore, since the boss core is connected to the steering shaft of the vehicle, it is arranged on the lower side of the steering wheel, and the ring core is located above the boss core that is close to the driver. And because it is arranged on the outside, the spoke core that connects the boss core and the ring core extends diagonally upward in the radial direction from the boss core. Since it is arranged in an inclined manner, it is easy to secure a space in the vertical direction up to the ring core metal portion on the upper side around the spoke core metal portion, and the boss on the lower side. It is difficult to secure a space with a height in the upward direction up to the core metal part, and as a result, the area of the contact surface for heat dissipation that conducts heat from the control device side is easily secured as well as the installation space of the control device itself. Therefore, it is possible to preferably dispose the control device and the heat conduction contact surface of the spoke core metal portion to suppress the temperature rise of the control device.

In this case, the branch rod portion of the spoke core metal portion is plastically deformed so that the driver can be received by substantially the entire surface of the ring portion when the driver interferes with the ring portion at the time of a vehicle collision. If the above is provided, it is desirable that the connecting portion is arranged at a position closer to the ring core metal portion than the planned deformation portion.

In such a configuration, when the steering wheel interferes with the driver due to a frontal collision of the vehicle or the like, the steering wheel makes the driver who interferes with the ring portion substantially the entire surface of the ring portion so as to exert a self-aligning action. The planned deformation part of the branch steering wheel is plastically deformed so that it can be received by, but at that time, the connecting part to which the control device is connected should be arranged on the ring core metal part side from the planned deformation part. For example, the steering wheel exerts a self-aligning action without hindering the plastic deformation of the planned deformation portion arranged in the branch rod portion, and the interfering driver can be appropriately received by substantially the entire surface of the ring portion. ..

Further, the steering wheel according to the present invention includes a lower cover made of synthetic resin that covers the lower part of the boss core metal portion and the spoke core metal portion.
The control device is connected to the lower cover side of the connecting portion, and the control device is connected to the lower cover side.
A heat radiating material capable of suppressing the temperature rise of the control device by surface contact with the control device side may be arranged at a portion where the lower cover faces the control device.

In such a configuration, one of the front and back surfaces is connected to the connecting portion of the spoke core metal portion, and the other front and back surfaces are connected to the heat radiating material of the lower cover, so that heat can be dissipated from both sides of the front and back surfaces. , Preferably, the temperature rise of the control device can be suppressed.

In this case, if the lower cover is formed by blending a heat conductive filler that enhances the heat conductivity, the heat of the heat radiating material can be efficiently conducted to the lower cover, and more preferably, the control device. The temperature rise can be suppressed.

Further, in the steering wheel according to the present invention, the core metal includes a ring core metal portion arranged on the ring portion, a boss core metal portion arranged on the boss portion, and the ring core metal portion. It is configured to include a spoke core metal portion, which is arranged on the spoke portion so as to connect the boss core metal portion.
The boss core metal part
The boss connected to the steering shaft when steering the vehicle,
A boss surrounding portion extending around the boss substantially orthogonally to the steering shaft and interposed between the boss and the spoke core metal portion, and a boss surrounding portion.
Is configured with
The connecting portion may be arranged on the boss surrounding portion.

In such a configuration, the connecting portion of the boss surrounding portion arranged around the boss connected to the steering shaft functions as a heat sink, and further, the control device is located on the steering shaft side and the spoke core portion side. Heat can be conducted and the temperature rise of the control device can be suppressed.

In this case, the control device includes a control main body portion provided with a control board and a cover covering the upper side of the control main body portion.
The connecting part
The heat conduction contact surface is arranged on the upper surface, and a connecting main body portion that is brought into contact with the lower surface side of the control main body portion and a vertical wall portion extending upward from the peripheral edge of the connecting main body portion are provided.
The cover is separated from the boss core metal portion.
A top plate that covers the upper part of the control body and
A joint edge portion disposed on the peripheral edge of the top plate portion and bonded to the joint portion arranged on the upper end side of the vertical wall portion by a fixing means.
A mounting portion that is disposed on the lower surface side of the top plate portion and mounts the control main body portion,
The side plate portion extending downward from the peripheral edge of the top plate portion and
With
The control main body portion of the control device is covered with the top plate portion of the cover and the connecting main body portion of the connecting portion at the top and bottom, and the side plate portion of the cover and the vertical wall portion of the connecting portion are laterally covered. It may be covered with a case and arranged by being covered with a case composed of the cover and the connecting portion.

In such a configuration, the lower side of the case that covers the periphery of the control main body of the control device can be formed from the connecting portion itself, the number of components of the control device can be reduced, and the temperature rise of the control device can be suppressed. Further, the control main body of the control device is attached to the cover on the upper side of the case, and if the cover to which the control main body is attached is connected to the connecting portion, the control device can be assembled to the boss core metal portion and controlled. The upper and lower sides and sides around the main body are covered with a case including a cover and a connecting portion, so that foreign matter is prevented from entering the control main body side provided with the control board.

It is a schematic plan view of the steering wheel of the 1st Embodiment which concerns on this invention. It is the schematic bottom view of the steering wheel of 1st Embodiment. It is a schematic enlarged bottom view which shows the connection part which attaches the control device of 1st Embodiment. It is a schematic partial enlarged vertical sectional view of the steering wheel of 1st Embodiment, and corresponds to the IV-IV part of FIG. It is the schematic part enlarged bottom view of the steering wheel of 1st Embodiment. It is a schematic partial enlarged vertical sectional view of the steering wheel of the modification of 1st Embodiment. FIG. 6 is an enlarged bottom view of a schematic portion of the steering wheel shown in FIG. It is the schematic plan view of the steering wheel of the 2nd Embodiment. It is a schematic cross-sectional view of the steering wheel of the 2nd Embodiment, and corresponds to the IX-IX part of FIG. It is a schematic cross-sectional view of the steering wheel of the 2nd Embodiment, and corresponds to the XX part of FIG. It is a schematic cross-sectional view of the steering wheel of the 2nd Embodiment, and corresponds to the XI-XI part of FIG. It is a schematic perspective view of the vicinity of the boss core metal portion of the second embodiment. It is a schematic exploded perspective view of the vicinity of the boss core metal portion of the second embodiment. It is a front view, a bottom view, and a side view which show the cover of 2nd Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the steering wheel W of the first embodiment includes a substantially annular ring portion R that the driver grips during steering. , A boss portion B arranged in the center of the ring portion R, and a spoke portion S connecting the ring portion R and the boss portion B are provided. The spoke portion S includes a left spoke portion SL and a right spoke portion SR extending from the boss portion B on both left and right sides, and a rear spoke portion SB extending rearward from the boss portion B.

Further, the steering wheel W includes a metal core metal 1 such as an aluminum alloy that connects the ring portion R, the boss portion B, and the spoke portions S (L, R, B). The core metal 1 connects the ring core metal portion 2 arranged on the ring portion R, the boss core metal portion 3 arranged on the boss portion B, and the ring core metal portion 2 and the boss core metal portion 3. The spoke core metal portions 6 (L, R, B), which are arranged in the spoke portions S (L, R, B), are provided.

The boss core metal portion 3 is arranged at the lowest position in the core metal 1, and is connected to the steering shaft (steering shaft) SS (see FIG. 4) during steering of the vehicle, the steel boss 4, and the periphery of the boss 4. The steering shaft SS extends substantially orthogonally to the steering shaft SS, and is provided with a boss surrounding portion 5 interposed between the boss 4 and the spoke core metal portion 6. The boss surrounding portion 5 includes a left side portion 5a and a right side portion 5b extending left and right from the boss 4, and further includes a rear side portion 5c extending rearward from the boss 4. Specifically, the rear side portion 5c is connected to each other at the rear end side of the left and right protruding rod portions 5ca, 5cc and the axial protruding rod portions 5ca, 5cc extending rearward from the left side portion 5a and the right side portion 5b. It is configured to include a horizontal rod portion 5d arranged in such a manner (see FIG. 1).

An assembly seat 5f for attaching the airbag device 22 described later to the core metal 1 is arranged near the center of the horizontal rod portion 5d in the left-right direction. The assembly seat 5f is a portion for inserting and locking the mounting pin 27 of the airbag device 22 (see FIG. 4), and the locking hole 5fa into which the mounting pin 27 is inserted and the inserted mounting pin 27 are elastically deformed. It is configured by disposing a locking pin 5fb for locking. Such an assembly seat 5f is also arranged on the left side portion 5a and the right side portion 5b of the boss surrounding portion 5 of the boss core metal portion 3 (see FIGS. 1 and 2).

Further, the spoke core metal portions 6L and 6R extend diagonally upward from the left side portion 5a and the right side portion 5b of the boss surrounding portion 5 of the boss core metal portion 3 to the left and right of the outside, and It is arranged so as to be connected to the ring core metal portion 2 arranged at the uppermost position in the core metal 1. The rear spoke core metal portion 6B extends diagonally upward from the rear side portion 5c of the boss surrounding portion 5 of the boss core metal portion 3 and is connected to the portions 2a and 2b of the ring core metal portion 2 arranged at the upper position. It is arranged so as to be.

More specifically, the rear spoke core metal portion 6B disposed on the rear spoke portion SB is lateral to the rear ends of the protruding rod portions 5ca and 5cc that branch to the left and right of the rear side portion 5c of the boss surrounding portion 5 and project. From the portion of the rod portion 5d, it extends diagonally upward and rearward while being separated from the left and right, and is connected to the ring core metal portion 2. That is, the rear spoke core metal portions 6B are composed of branch rod portions 7 (L, R) that are arranged with a gap H between them (see FIGS. 3 and 4). The branch rod portions 7L and 7R are connected by the horizontal rod portion 5d on the boss core metal portion 3 side, and are connected to each other by the plate-shaped connecting portion 10 on the ring core metal portion 2 side. Has been done.

The connecting portion 10 is arranged behind the planned deformation portion 9 when the left and right edges 10e and 10f are connected to the branch rod portions 7L and 7R to exert the self-aligning action of the steering wheel W ( (See FIGS. 1 to 4). By the way, when the steering wheel W interferes with the driver in the event of a frontal collision of the vehicle, the spoke core metal exerts a self-aligning action and catches the driver on almost the entire surface of the ring portion R. The planned deformation portion 9 behind the lateral rod portion 5d in the portion 6B is plastically deformed. That is, in the steering wheel W mounted on the vehicle, when the impact force F (see FIG. 4) that the driver interferes with acts on the rear portion Rb of the ring portion R, the planned deformation portion 9 is plastically deformed to omit the ring portion R. It exerts a self-aligning action that deforms along the vertical direction, catches the driver on almost the entire surface of the ring portion R, and protects the driver. Then, in the case of the embodiment, the connecting portion 10 is arranged on the ring core metal portion 2 side behind the deformable planned portion 9 arranged in the branch rod portion 7 (L, R) of the rear spoke core metal portion 6B. ing. Therefore, when the self-aligning action of the steering wheel W is exerted, when the branch rod portions 7 (L, R) are bent and plastically deformed downward around the planned deformation portion 9 (see the two-dot chain line in FIG. 4). A connecting portion 10 for attaching a control device 40, which will be described later, is arranged at a position that does not hinder the deformation, and the steering wheel W can appropriately exert a self-aligning action.

As shown in FIG. 4, the airbag device 22 includes a folded airbag 24, an inflator 25 that supplies expansion gas to the airbag 24, and an airbag cover 23 that covers the folded airbag 24. , The airbag 24, the inflator 25, and the mounting base 26 for holding the airbag cover 23, and the boss core metal portion 3 is assembled by using the mounting pin 27 provided on the mounting base 26. It is attached and fixed to the attached seat 5f. In the airbag device 22, when the inflator 25 operates to generate expansion gas, the airbag 24 expands, and the expanding airbag 24 pushes open the airbag cover 23 to protect the driver. In addition, while being supported on the ring portion R, it expands and expands greatly.

Further, the ring core metal portion 2 in the core metal 1 and the spoke core metal portion 6 (L, R, B) in the vicinity of the ring core metal portion 2 are coated with an elastic synthetic resin such as urethane. A layer 20 is arranged, and a skin 21 such as leather is further arranged on the surface side of the coating layer 20. Further, in the vicinity of the rear spoke portion SB, the decorative cover 29 made of synthetic resin is adhered to the coating layer 20 on the inner edge side of the ring portion R, and the coating layer 20 is formed between the decorative cover 29 and the airbag cover 23. A decorative cover 28 made of a bonded synthetic resin is arranged. Furthermore, a lower cover 30 made of a synthetic resin such as polypropylene is disposed on the lower side of the boss portion B, and an airbag device 22 is disposed on the upper side of the boss portion B (FIG. 4). reference). The lower cover 30 is attached to a plurality of attachment seats 5e arranged on the core metal 1 by using screws (not shown).

Further, as shown in FIGS. 1 to 5, the connecting portion 10 of the core metal 1 has the trailing edge 10b side from the leading edge 10a side arranged upward along the inclination of the branch rod portion 7 (LR). It has a rectangular plate shape. The connecting portion 10 is provided with mounting holes 11 for penetrating the bolts 18 at the four corners to serve as mounting portions for mounting the control device 40 and as a heat radiating plate 10 for dissipating heat from the control device 40. Has been done. That is, although the heat radiating plate 10 has a lower surface 10c side in surface contact with the control device 40 side to form a heat conduction contact surface 12 for conducting heat of the control device 40, it is opposite to the heat conduction contact surface 12. The upper surface 10d side of the side is exposed to the atmosphere, and functions as a heat radiating surface 13 capable of radiating the heat of the control device 40 into the atmosphere.

The control device 40 performs image processing and the like. A predetermined IC chip is arranged on the control substrate 41, a sheet metal cover 42 is arranged on the heat conduction contact surface 12 side, and heat conduction is performed. A heat radiating sheet 43 made of silicone is attached so as to improve the surface contact with the contact surface 12 and enhance the heat conduction effect. In the case of the embodiment, the control board 41 has a rectangular plate shape substantially similar to that of the heat radiating plate 10, and the cover 42 and the heat radiating sheet 43 have a substantially rectangular shape in which the length dimensions in the front-rear direction and the left-right direction are smaller than those of the control board 41. It has a plate shape. In the control device 40, the heat radiating sheet 43 is attached to the cover 42, the heat radiating sheet 43 side is the contact surface (heat conduction surface) 40a side with the heat radiating plate 10, and the contact surface 40a side is the spoke core metal. The bolts 18 are inserted into the mounting holes 40b provided at the four corners of the control board 41 and the mounting holes 11 of the heat radiating plate 10 by contacting the heat conduction contact surface 12 of the heat radiating plate 10 of the portion 6B, and each bolt. A nut 19 is fastened to 18 and is attached and fixed to the heat radiating plate 10.

As for the assembly of the steering wheel W, the control device 40 is attached to the heat radiating plate (connecting portion) 10 as described above with respect to the core metal 1 provided with the coating layer 20, the skin 21, and the decorative cover 29 in advance. At the same time, the lower cover 30 and the decorative cover 28 are attached, and an electronic device (not shown) to be mounted on the boss portion B is attached. N is attached, the core metal 1 is fastened to the steering shaft SS, and various lead wires on the vehicle body side extending from the periphery of the steering shaft SS are connected to the corresponding control device 40 and the like. Then, while connecting the operation signal line extending from the vehicle side to the inflator 25 of the airbag device 22 assembled in advance, each mounting pin 27 of the airbag device 22 is engaged with the assembly seat 5f of the core metal 1. If the steering wheel W is inserted into the stop hole 5fa and locked to the locking pin 5fb, the assembly of the steering wheel W is completed and the steering wheel W can be mounted on the vehicle.

Then, in the steering wheel W of the first embodiment, even if the control device 40 performs a predetermined control process to raise the temperature, the spoke core metal portion 6B of the core metal 1 is used as a radiator to conduct heat of the core metal 1. Since the control device 40 is arranged in surface contact with the contact surface 12, the heat of the control device 40 is conducted to the spoke core metal portion 6B of the core metal 1, and the temperature rise of the control device 40 is suppressed. Then, the spoke core metal portion 6B of the core metal 1 to which the control device 40 is connected is connected to another portion (ring core metal portion 2 or boss) of the steering wheel W from the heat conduction contact surface 12 connected to the control device 40. It extends to the core metal portion 3), can efficiently dissipate heat, and can suppress the temperature rise of the control device 40.

Therefore, in the steering wheel W of the first embodiment, the heat of the control device 40 can be smoothly conducted to the spoke core metal portion 6B of the core metal 1 to dissipate heat, and it is preferable to raise the temperature of the mounted control device 40. Can be suppressed.

Then, in the steering wheel W of the first embodiment, the spoke core metal portion 6B of the core metal 1 includes a plate-shaped connecting portion 10, and the connecting portion 10 includes a heat conduction contact surface 12, and the control device is provided. It is connected to 40, and the surface 10d on the side opposite to the heat conduction contact surface 12 is exposed and arranged.

Therefore, in the first embodiment, the plate-shaped connecting portion 10 provided with the heat conduction contact surface 12 for connecting the control device 40 contacts the heat conduction surface 40a of the control device 40. In addition to conducting the heat conducted to 12 to other parts (ring core metal part 2 and boss core metal part 3), the surface 10d opposite to the heat conduction contact surface 12 is used as the heat dissipation surface 13 in the atmosphere. Since it can function as a heat radiating plate that dissipates heat to the surface, it is possible to more preferably suppress the temperature rise of the control device 40.

Further, in the steering wheel W of the first embodiment, the core metal 1 is a ring core metal portion 2 arranged on the ring portion R, a boss core metal portion 3 arranged on the boss portion B, and a ring core metal. A spoke core portion 6 (L, R, B) arranged in a spoke portion S (L, R, B) so as to connect the portion 2 and the boss core metal portion 3 is provided. Further, the spoke core metal portion 6B is provided with a branch rod portion 7 (L, R) separated from each other with a gap H between the ring core metal portion 2 and the boss core metal portion 3, and is branched. A plate-shaped connecting portion 10 is arranged so as to connect the rod portions 7 (L, R) to each other.

Therefore, in the first embodiment, the plate-shaped connecting portion 10 provided with the heat conduction contact surface 12 for connecting the control device 40 functions as the heat sink itself and is separated from each other in the spoke core metal portion 6B. It is arranged so as to straddle the two branch rods 7 (L, R), and it is possible to conduct heat to the branch rods 7L, 7R on both sides, and more preferably, the control device 40 The temperature rise can be suppressed. Further, the spoke core metal portion 6B to which the control device 40 is connected is a ring core metal portion 2 of the ring portion R that is gripped when the driver steers the steering wheel W, and a boss core metal portion B of the central boss portion B of the ring portion R. A ring portion R that covers a coating layer 20 such as urethane around the portion of the core metal 1 (ring core metal portion 2) that connects the portion 3 and the core metal 1, or the steering shaft of the vehicle. (Steering shaft) Unlike the boss portion B, which is connected to the SS or mounts the airbag device 22, it is easy to secure a space SP (SPU, SPD) (see FIG. 4). Further, since the boss core metal portion 3 is connected to the steering shaft SS, it is arranged on the lower side of the steering wheel W, and the ring core metal portion 2 is from the boss core metal portion 3 approaching the driver. Since the boss core metal portion 3 and the ring core metal portion 2 are connected to each other, the spoke core metal portion 6 (L, R, B) that connects the boss core metal portion 3 and the ring core metal portion 2 is the boss core metal portion 3 because it is arranged above and outside. Therefore, it is arranged so as to be inclined so as to extend diagonally upward in the radial direction, and around the spoke core metal portion 6B, as shown in FIG. 4, the ring core metal is on the upper side. It is easy to secure a space SPU having a height up to the portion 2 in the vertical direction, and it is difficult to secure a space SPD having a height up to the boss core metal portion 3 on the lower side. As a result, the control device 40 itself The area of the contact surface for heat dissipation that conducts heat from the control device 40 side can be easily secured widely together with the installation space of the control device 40, and the contact surface for heat conduction between the control device 40 and the spoke core portion 6B is preferably used. 12 can be arranged to suppress the temperature rise of the control device 40.

Further, in the first embodiment, when the branch rod portions 7 (L, R) of the spoke core metal portion 6B interfere with the ring portion R at the time of a vehicle collision, the driver is placed on substantially the entire surface of the ring portion R. Even if the deformable portion 9 that is plastically deformed so as to be received is provided, the connecting portion 10 is dislocated from the planned deformable portion 9 at a position on the rear side of the ring core metal portion 2 side.

Therefore, in the first embodiment, when the steering wheel W interferes with the driver due to a frontal collision of the vehicle or the like, the steering wheel W rings the driver who interferes with the ring portion R so as to exert a self-aligning action. The planned deformation portion 9 of the branch steering wheel 7 (L, R) is plastically deformed so that it can be received on substantially the entire surface of the portion R. At that time, the connecting portion 10 to which the control device 40 is connected is scheduled to be deformed. Since it is arranged on the ring core metal portion 2 side behind the portion 9, the plastic deformation of the planned deformation portion 9 arranged on the branch steering wheel portions 7 (L, R) (see the two-point chain line in FIG. 4). The steering wheel W exerts a self-aligning action and can appropriately catch the interfering driver on substantially the entire surface of the ring portion R.

Further, heat dissipation structures may be provided on the front and back of the control device 40A, as in the steering wheel WA of the modified example shown in FIGS. 6 and 7, so that the control device 40 can further dissipate heat. In this steering wheel WA, similarly to the steering wheel W of the embodiment, a connecting portion 10 as a heat radiating plate for connecting the branch rod portions 7L and 7R to each other is provided on the spoke core metal portion 6B side, and the control device 40A is provided. A heat radiating sheet 43 is attached to a cover 42 covering the control board 41 of the above, and the heat radiating sheet 43 is used on the heat conduction contact surface 12 of the connecting portion (heat radiating plate) 10 to the upper surface side of the control device 40A. The control device 40A is mounted and fixed to the lower surface 10c side of the connecting portion 10 by using the bolt 18 and the nut 19 through which the mounting holes 11 and 40b are inserted so that the heat conductive surface 40a is brought into contact with the heat conductive surface 40a.

In this steering wheel WA, the control device 40A is configured by assembling a cap 46 filled with thermal paste 45 on the lower surface 41a side opposite to the spoke core portion 6B side of the control board 41. The thermal paste 45 is formed by blending a powder such as alumina with silicone or the like, and the cap 46 has a rectangular parallelepiped box shape made of a metal material such as aluminum. The lower cover 30A that covers the lower surface side of the boss portion B of the steering wheel WA is made of a metal material such as aluminum that abuts on the lower surface 40c of the control device 40A (lower surface 46a of the cap 46), unlike the lower cover 30 of the embodiment. A plate-shaped (rectangular plate-shaped) heat-dissipating material 32 made of the above material is attached and configured. The lower surface 32a of the heat radiating material 32 is supported by mounting ribs 31 and 31 projecting from the lower cover 30A on the inner peripheral side. The mounting ribs 31 and 31 are provided with a fitting portion 31a for fitting and assembling the lower end side of the heat radiating material 32.

The lower cover 30A provided with the mounting ribs 31 and 31 has a different shape in which the mounting ribs 31 and 31 having the fitting portion 31a are provided. In addition, the synthetic resin material such as polypropylene and heat such as carbon nanotubes are used. It is different from the lower cover 30 of the embodiment only in that it is molded from a molding material containing a heat conductive filler that enhances conductivity, and other configurations and molding methods are the same as those of the lower cover 30 of the embodiment. Is.

Similar to the steering wheel W of the embodiment, this steering wheel WA includes a lower cover 30A made of synthetic resin that covers the lower part of the boss core metal portion 3 and the spoke core metal portions 6 (L, R, B), and is a control device. 40A is connected to a portion of the spoke core portion 6B on the lower cover 30A side on the lower surface 10c side of the heat radiating plate 10. Then, in this steering wheel WA, a heat radiating material 32 capable of suppressing the temperature rise of the control device 40A by surface contact with the control device 40A side is arranged at a portion where the lower cover 30A faces the lower surface 40c of the control device 40A. It is set up.

Therefore, in this steering wheel WA, the control device 40A abuts the upper surface 40a side of one of the front and back surfaces with the heat conduction contact surface 12 of the heat radiating plate 10 as the connecting portion of the spoke core metal portion 6B to dissipate heat. The bolts 18 and nuts 19 are fixed and connected to the plate 10, and the other lower surface 40c side of the front and back surfaces is connected so as to abut the heat conduction contact surface 33 on the upper surface side of the heat radiating material 32 of the lower cover 30A. Since heat can be dissipated from both the front and back sides, it is possible to more preferably suppress the temperature rise of the control device 40A.

Further, in this steering wheel WA, the lower cover 30A is formed by blending a heat conductive filler that enhances the heat conductivity, and the heat of the heat radiating material 32 can be efficiently conducted to the lower cover 30A. Preferably, the temperature rise of the control device 40A can be suppressed.

In the steering wheel WA, the cap 46 filled with the heat-dissipating grease 45 is configured to be in contact with the heat-dissipating material 32, but the lower cover 30A in which the heat-conducting filler is mixed without disposing the heat-dissipating material 32. The portion may be configured to be in contact with the cap 46 filled with the thermal paste 45.

Incidentally, when the lower cover is formed by blending the heat conductive filler, the control device may be brought into contact with the lower cover containing the heat conductive filler, and the lower cover itself may be used as a heat radiating body. In this case, the control device may be attached to the lower cover itself, or may be attached to the spoke core metal portion or the like so as to be in contact with the lower cover.

Further, in the steering wheel W of the first embodiment, the case where the control device 40 is connected to the lower surface 10c side of the heat radiating plate 10 on the lower cover 30 side is shown, but the upper surface 10d side of the heat radiating plate 10 (FIG. 4). (See), the control device 40 may be connected to the spoke core metal portion 6B so that the heat radiating sheet 43 side of the control device 40 is brought into contact with the control device 40. In this case, the heat radiating surface 13 as the heat radiating plate 10 that dissipates heat to the atmosphere is on the lower surface 10c side.

In the steering wheel W of the first embodiment, the case where the control device 40 is connected to the spoke core metal portion 6B is shown, but as in the steering wheel WB of the second embodiment shown in FIGS. 8 to 14, the control device 50 May be configured to be connected to the boss core metal portion 3B.

In this steering wheel WB, as in the first embodiment, the core metal 1B made of an aluminum alloy or the like is arranged in the ring core metal portion 2B arranged in the ring portion R and the boss core metal portion arranged in the boss portion B. 3B and spoke core portions 6 (L, R) arranged in the spoke portions S so as to connect the ring core metal portion 2B and the boss core metal portion 3B are provided. The boss core metal portion 3B extends substantially orthogonally to the steel boss 4 connected to the steering shaft SS (see FIG. 10) when the vehicle is steered, and the steering shaft SS around the boss 4, and the boss 4 and the spokes. A boss surrounding portion 5B interposed between the core metal portions 6 (L, R) is provided, and the boss surrounding portion 5B is provided with a connecting portion 14 connected to the control device 50. There is.

In the core metal portion 1B of the second embodiment, the spoke core metal portions 6L and 6R for connecting the boss core metal portion 3B and the ring core metal portion 2B are provided with two spokes extending from the boss core metal portion 3B to the left and right. However, the spoke core portion SB as the core metal 1B is not arranged on the spoke portion SB on the rear side.

The core metal 1B of the second embodiment does not include the branch rod portions 7L and 7R of the core metal 1 of the first embodiment and the connecting portion 10, and is a rear side portion extending rearward from the boss 4 in the boss surrounding portion 5B. 5c is behind the protruding rods 5ca and 5cc and the protruding rods 5ca and 5cc, which project rearward from the left side 5a and the right side 5b connected to the spoke cores 6L and 6R in the boss surrounding portion 5, respectively. It is configured to include a horizontal rod portion 5d that connects the ends to each other, and a connecting portion 14 that is arranged so as to close between the protruding rod portions 5ca and 5cc from the trailing edge side of the boss 4. Similar to the first embodiment, the boss surrounding portion 5 is provided with an assembly seat 5f for assembling the airbag device 22 on the lateral rod portion 5d, the left side portion 5a, and the right side portion 5b, and the left side portion 5a and the left side portion 5a and the like. A mounting seat 5e for attaching a lower cover (not shown) is provided on the right side portion 5b.

The connecting portion 14 functions as a heat sink that comes into surface contact with the control device 50 and suppresses the temperature rise of the control device 50. The connecting portion 14 has a plate-like shape (substantially) in which the heat conduction contact surface 12B is arranged on the upper surface to close between the trailing edge portion 5cc on the trailing edge side of the boss 4 and the protruding rod portions 5ca and 5cc in the boss surrounding portion 5. A hexagonal plate-shaped connecting main body portion 15 and a vertical wall portion 16 extending upward from the peripheral edge of the connecting main body portion 15 are provided. The vertical wall portion 16 includes a left portion 16a extending upward from the left edge side of the connecting main body portion 15, a right portion 16b extending upward from the right edge side of the connecting main body portion 15, and a front portion extending upward from the front edge side of the connecting main body portion 15. It is composed of a part 16c and a part 16c. In the case of the second embodiment, the left portion 16a is composed of the left protruding rod portion 5ca, the right portion 16b is composed of the right protruding rod portion 5cc, and the front portion 16c is the trailing edge on the trailing edge side of the boss 4. It is composed of 5 cc parts. The connecting main body portion 15 is arranged so that the rear end side is not connected to the horizontal rod portion 5d but is arranged with a gap, and the lower end sides of the left and right protruding rod portions 5ca and 5cc are connected to each other. .. Further, in the connecting main body portion 15, the heat conduction contact surface 12B on the upper surface 15a side is brought into contact with the heat radiating sheet 55 attached to the lower surface 53b side of the control main body portion 52 described later of the control device 50, and the lower surface 15b The side is a heat radiating surface 13B that is exposed to the atmosphere and releases heat to the atmosphere.

The upper end surface 16d side of the protruding rod portions 5ca and 5cc forming the left portion 16a and the right portion 16b of the vertical wall portion 16 is a coupling portion 17 to which the control device 50 is attached, and a bolt 18B is inserted through the coupling portion 17. The mounting hole 17a is opened.

The control device 50 performs temperature control, grip detection processing, image processing, and the like of a heater provided on the ring portion R (not shown), and is a control main body 52 having a control board 53 and an upper side of the control main body 52. It is configured to include a cover 62 for covering the above. Predetermined wiring and various electronic components 54 are provided on the upper surface 53a side of the control board 53, and the lower surface 53b of the control board 53 has good surface contact with the heat conduction contact surface 12B for heat conduction. A heat radiating sheet 55 made of silicone is attached so as to enhance the effect. Further, on the peripheral edge of the control board 53, a mounting hole 53c (see FIG. 13) is formed through which a screw 69 for mounting the control board 53 to the cover 62 is inserted.

The cover 62 is made of a synthetic resin such as ABS resin, which is separate from the boss core metal portion 3, and covers the upper part of the control main body portion 52 to form a top plate portion 63 having substantially the same shape as the outer shape of the connecting main body portion 15. A joint edge portion that is arranged so as to extend upward from the peripheral edge of the top plate portion 63 and is connected to the joint portion 17 arranged on the upper end surface 16d side of the vertical wall portion 16 by a bolt 18B as a fixing means. 64, a mounting portion 65 arranged on the lower surface 63b side of the top plate portion 63 to attach the control main body portion 52, and a side plate portion 67 extending downward from the trailing edge 63c of the top plate portion 63. ing.

The connecting edge portion 64 is arranged on the inner peripheral side of the vertical wall portion 16 of the connecting portion 14 composed of the protruding rod portions 5ca, 5cc and the trailing edge portion 5cc of the rear side portion 5c of the boss surrounding portion 5 of the boss core metal portion 3. A vertical plate portion 64a extending upward from the outer peripheral edge of the top plate portion 63 and a flange portion 64b extending outward from the upper end of the vertical plate portion 64a so as to abut the upper end surface 16d of the vertical wall portion 16 are provided. At the tip of the flange portion 64b, a coupling piece 64c provided with a mounting hole 64d for inserting a bolt 18B as a fixing means corresponding to the left and right coupling portions 17 of the vertical wall portion 16 is provided on the left and right. It is projected on the outer side of.

The mounting portion 65 has a cylindrical shape protruding downward from the lower surface 63b of the top plate portion 63, and has a mounting hole 65a through which a screw 69 for inserting the mounting hole 53c of the control board 53 is screwed.

The side plate portion 67 is arranged so as to extend downward from the trailing edge 63c of the top plate portion 63, and is used for a connector (not shown) for conducting conduction to various electronic components 54 provided on the control board 53 of the control main body portion 52. , Openings 67a, 67b, 67c are arranged (see B in FIG. 14).

A connection port 63d is also provided on the upper surface 63a side of the top plate 63 for a connector (not shown) for conducting conduction to various electronic components 54 (see FIG. 14).

Then, in the second embodiment, the control main body 52 of the control device 50 is covered with the top plate 63 of the cover 62 and the connecting main body 15 of the connecting portion 14 on the top and bottom, and the side plates of the cover 62 on the sides. It will be covered with the portion 67 and the vertical wall portion 16 of the connecting portion 14. That is, the control main body 52 including the control board 53 on which the electronic components 54 and the like in the control device 50 are arranged is covered with a case 60 whose upper and lower sides and sides are composed of a cover 62 and a connecting portion 14. Therefore, it will be arranged on the steering wheel WB. In other words, the control main body 52 is covered with the upper side 60a of the case 60 in which the upper surface 52a side and the rear surface 52d side are formed of the cover 62 (see FIG. 11), and the left and right sides and the front side excluding the lower surface 52b side and the rear surface 52d side. The front side surface 52c and the front side surface 52c are covered with the lower side portion 60b formed of the connecting portion 14, and foreign matter is prevented from entering the steering wheel WB.

To assemble the control device 50 to the core metal 1B, a screw 69 that penetrates the control board 53 to which the electronic component 54 of the control main body 52 is attached and the attachment hole 53c from the lower surface 53b side is attached to each attachment portion 65. It is screwed into the mounting hole 65a and mounted on the cover 42, and then the left and right coupling pieces 64c of the cover 62 are brought into contact with the coupling portion 17 on the upper end surface 16d of the vertical wall portion 16 of the connecting portion 14, and each mounting is performed. If the holes 64d and 17a are matched with each other, the bolts 18B are inserted into the mounting holes 64d and 17a (see FIGS. 8 and 9), and the nuts 19B are fastened to the bolts 18B, the control device 50 is connected to the steering wheel WB. Can be assembled.

Then, the steering wheel WB of the second embodiment can also be mounted on the vehicle by attaching the airbag device 22 or the like as in the first embodiment.

Even in the steering wheel WB of the second embodiment, even if the control device 50 performs a predetermined control process to raise the temperature, the boss core metal portion 3B of the core metal 1B is used as a radiator for heat conduction of the core metal 1B. Since the control device 50 is arranged in surface contact with the contact surface 12B, the heat of the control device 50 is conducted to the boss core metal portion 3B of the core metal 1B, and the temperature rise of the control device 50 is suppressed. Then, the boss core metal portion 3B of the core metal 1B to which the control device 50 is connected is connected to another portion (spoke core metal portion 6 or ring) of the steering wheel WB from the heat conduction contact surface 12B connected to the control device 50. It extends to the core metal portion 2B), can efficiently dissipate heat, and can suppress the temperature rise of the control device 50.

Therefore, even in the steering wheel WB of the second embodiment, the heat of the control device 50 can be smoothly conducted to the boss core metal portion 3B of the core metal 1B to dissipate heat, and it is preferable to raise the temperature of the mounted control device 50. Can be suppressed.

Further, also in the steering wheel WB of the second embodiment, the boss core metal portion 3B of the core metal 1B includes the connecting main body portion 15 of the plate-shaped connecting portion 14, and the connecting main body portion 15 of the connecting portion 14 is for heat conduction. The contact surface 12B is provided and connected to the control device 50, and the surface 15b on the side opposite to the heat conduction contact surface 12B is exposed and arranged.

Therefore, also in the second embodiment, the plate-shaped connecting portion 14 provided with the heat conduction contact surface 12B for connecting the control device 50 contacts the heat conduction surface 50a of the control device 50. In addition to conducting the heat conducted to 12B to other parts (spoke core metal part 6 and ring core metal part 2B), the surface 15b opposite to the heat conduction contact surface 12B is used as the heat dissipation surface 13B in the atmosphere. Since it can function as a heat radiating plate that dissipates heat to the surface, it is possible to more preferably suppress the temperature rise of the control device 50.

Further, in the steering wheel WB of the second embodiment, as in the first embodiment, the core metal 1B is arranged on the ring core metal portion 2B and the boss portion B, and the boss core is arranged on the ring portion R. It is configured to include a gold portion 3B and a spoke core metal portion 6 arranged on the spoke portion S so as to connect the ring core metal portion 2B and the boss core metal portion 3B. Further, the boss core metal portion 3B extends substantially perpendicular to the steering shaft SS around the boss 4 connected to the steering shaft SS when the vehicle is steered, and the boss 4 and the spoke core metal portion 6 are connected to each other. It is configured to include a boss surrounding portion 5B interposed between them. However, in the second embodiment, the connecting portion 14 is arranged in the boss surrounding portion 5B.

Therefore, in the second embodiment, the connecting portion 14 of the boss surrounding portion 5B arranged around the boss 4 connected to the steering shaft SS functions as a heat radiating plate, and further, the steering shaft SS side and the spoke core metal. The heat of the control device 50 can be conducted to the unit 6 side, and the temperature rise of the control device 50 can be suppressed.

Further, in the second embodiment, the control device 50 includes a control main body 52 having a control board 53 and a cover 62 covering the upper side of the control main body 52, and the connecting portion 14 is a heat conduction contact. A connecting main body 15 having a contact surface 12B disposed on the upper surface 15a and abutting on the lower surface 50a (53b) side of the control main body 52, and a vertical wall portion 16 extending upward from the peripheral edge of the connecting main body 15. It has. Further, the cover 62 is arranged separately from the boss core metal portion 3B, the top plate portion 63 that covers the upper part of the control main body portion 52, and the peripheral edge of the top plate portion 63, and the upper end surface 16d of the vertical wall portion 16 The control main body 52 is arranged on the lower surface 63b side of the top plate 63 and the coupling edge 64 which is bonded by the bolt 18B and the nut 19B as the fixing means to the coupling portion 17 arranged on the side. A mounting portion 65 for mounting and a side plate portion 67 extending downward from the peripheral edge of the top plate portion 63 are provided. Then, the control main body 52 of the control device 50 is covered with the top plate 63 of the cover 62 and the connecting main body 15 of the connecting portion 14 at the top and bottom, and the side plate portion 67 of the cover 62 and the connecting portion 14 on the sides. The case 60 is covered with the vertical wall portion 16 of the above, and is covered with the case 60 composed of the cover 62 and the connecting portion 14.

Therefore, in the second embodiment, the lower side of the case 60 that covers the periphery of the control main body 52 of the control device 50 can be formed from the connecting portion 14 itself, the number of components of the control device 50 is reduced, and the control device 50 is reduced. It is possible to suppress the temperature rise of. Further, the control main body 52 of the control device 50 is attached to the cover 62 as the upper side 60a of the case 60, and if the cover 62 to which the control main body 52 is attached is connected to the connecting portion 14, the control main body 50 is bossed. It can be assembled to the core metal portion 3B, and the upper and lower sides and sides around the control main body portion 52 are covered with a case 60 including a cover 62 as an upper portion 60a and a connecting portion 14 as a lower side portion 60b. Therefore, foreign matter is prevented from being mixed into the control main body 52 side provided with the control board 53.

In the steering wheels W and WB of the first and second embodiments, the case where the ring portion R is formed in a substantially annular shape is shown, but the ring portion R is other than the substantially annular shape, for example, in a plan view. , U-shaped, H-shaped, square ring, or the like.

1,1B ... core metal, 2,2B ... ring core metal part, 3,3B ... boss core metal part, 4 ... boss, 5,5B ... boss surrounding part, 6 (L, R, B) ... spoke core metal part , 6B ... Rear spoke core metal part, 7 (L, R) ... Branch rod part, 9 ... Deformed part, 10 ... Heat dissipation plate / connection part, 12,12B ... Heat conduction contact surface, 13,13B ... Heat dissipation surface,
14 ... Heat sink / connecting part, 15 ... Connecting body part, 16 ... Vertical wall part, 16d ... Upper end surface, 17 ... Joint part, 18, 18B ... (Fixing means) Bolt, 19, 19B ... Nut,
30, 30A ... Lower cover, 32 ... Heat dissipation material, 33 ... Heat conduction contact surface, 40, 40A ... Control device,
50 ... Control device, 52 ... Control body, 53 ... Control board, 60 ... Case, 62 ... Cover, 63 ... Top plate, 64 ... Bonding edge, 64c ... Bonding piece, 65 ... Mounting, 67 ... Side plate ,
R ... Ring part, B ... Boss part, S (L, R, B) ... Spoke part, SS ... (Steering shaft) Steering shaft, H ... Gap, W, WA, WB ... Steering wheel.

Claims (8)

A ring portion to be gripped during steering, a boss portion arranged in the center of the ring portion, and a spoke portion connecting the ring portion and the boss portion are provided, and a control device for raising the temperature during operation is provided. It is a steering wheel that is constructed by
A metal core metal for connecting the ring portion, the boss portion, and the spoke portion is provided.
The control device is arranged by connecting the core metal as a heat radiating body to the core metal.
A steering wheel characterized in that the core metal is configured by disposing a heat conduction contact surface that makes surface contact with the control device side to conduct heat. The core metal includes a plate-shaped connecting portion and has a plate-like connecting portion.
The connecting portion is provided with the heat conduction contact surface and is connected to the control device, and the surface opposite to the heat conduction contact surface is exposed and arranged. The steering wheel according to claim 1. The core metal connects the ring core metal portion disposed on the ring portion, the boss core metal portion arranged on the boss portion, and the ring core metal portion and the boss core metal portion. It is configured to include a spoke core metal portion, which is arranged on the spoke portion.
The spoke core metal part
A branch rod portion that is separated from each other with a gap between the ring core metal portion and the boss core metal portion is provided.
The steering wheel according to claim 2, wherein the connecting portions are arranged so as to connect the branch rod portions to each other. The branch rod portion of the spoke core metal portion includes a deformable portion that is plastically deformed so that the driver can be received by substantially the entire surface of the ring portion when the driver interferes with the ring portion at the time of a vehicle collision. ,
The steering wheel according to claim 3, wherein the connecting portion is arranged at a position closer to the ring core metal portion than the planned deformation portion. A synthetic resin lower cover that covers the lower part of the boss core metal portion and the spoke core metal portion is provided.
The control device is connected to the lower cover side of the connecting portion, and the control device is connected to the lower cover side.
3. The third aspect of the present invention is that the lower cover is provided with a heat radiating material capable of suppressing the temperature rise of the control device by surface contact with the control device side at a portion facing the control device. Alternatively, the steering wheel according to claim 4. The steering wheel according to claim 5, wherein the lower cover is formed by blending a heat conductive filler that enhances heat conductivity. The core metal connects the ring core metal portion disposed on the ring portion, the boss core metal portion arranged on the boss portion, and the ring core metal portion and the boss core metal portion. It is configured to include a spoke core metal portion, which is arranged on the spoke portion.
The boss core metal part
The boss connected to the steering shaft when steering the vehicle,
A boss surrounding portion extending around the boss substantially orthogonally to the steering shaft and interposed between the boss and the spoke core metal portion, and a boss surrounding portion.
Is configured with
The steering wheel according to claim 2, wherein the connecting portion is arranged on the boss surrounding portion. The control device includes a control main body portion provided with a control board and a cover covering the upper side of the control main body portion.
The connecting part
The heat conduction contact surface is arranged on the upper surface, and a connecting main body portion that is brought into contact with the lower surface side of the control main body portion and a vertical wall portion extending upward from the peripheral edge of the connecting main body portion are provided.
The cover is separated from the boss core metal portion.
A top plate that covers the upper part of the control body and
A joint edge portion disposed on the peripheral edge of the top plate portion and bonded to the joint portion arranged on the upper end side of the vertical wall portion by a fixing means.
A mounting portion that is disposed on the lower surface side of the top plate portion and mounts the control main body portion,
The side plate portion extending downward from the peripheral edge of the top plate portion and
With
The control main body portion of the control device is covered with the top plate portion of the cover and the connecting main body portion of the connecting portion at the top and bottom, and the side plate portion of the cover and the vertical wall portion of the connecting portion are laterally covered. The steering wheel according to claim 7, wherein the steering wheel is covered with a case, and is covered with a case composed of the cover and the connecting portion.

Images