JP5915507B2 - Steering wheel and method for manufacturing steering wheel - Google Patents

Description

  The present invention relates to a steering wheel for steering a vehicle and a method for manufacturing the steering wheel.

  Conventionally, a steering wheel capable of changing the appearance design is known (see, for example, Patent Document 1). In this steering wheel, the design component (cover shell body) to be assembled to the core part of the ring portion gripped during steering is replaced with the design component (garnish cover) to be assembled to the core part of the spoke or the like. Was changing.

  The steering wheel generally includes a ring portion that is gripped during steering, a boss portion that is disposed in the center of the ring portion, and a spoke portion that connects the boss portion and the ring portion. The boss part and the spoke part are provided with metal cores that connect each other.

JP 2010-254198 A

  However, in the conventional steering wheel, the design component parts are attached to the core part of the ring part or the spoke part using a detachable attachment structure, and the attachment stability is lacking.

  The present invention solves the above-described problems, and an object of the present invention is to provide a steering wheel and a method of manufacturing the steering wheel that can change the design of the spoke portion while ensuring the mounting stability.

The steering wheel according to the present invention includes a ring part that is gripped during steering, a boss part that is arranged at the center of the ring part, and a spoke part that connects the boss part and the ring part.
A metal cored bar that interconnects the ring part, the boss part, and the spoke part is disposed,
The core bar includes a ring core bar part disposed in the ring part, a boss core bar part disposed in the boss part, and a spoke core bar part disposed in the spoke part,
The ring core metal part and the spoke core metal part in the vicinity of the ring core metal part are covered with a coating layer made of a synthetic resin,
The covering layer is a steering wheel configured to include a ring covering portion that covers the ring core metal portion and a spoke covering portion that covers the spoke core metal portion,
An airbag device is disposed on the upper surface side of the boss portion,
A plurality of assembly portions for disposing the airbag device are disposed around a fastening tube portion for fastening the boss core portion with a steering shaft in the core.
A plurality of the spoke portions are disposed,
A genuine spoke part provided with the spoke core metal part to be covered with the spoke covering part;
An extension covering portion extending from the ring covering portion without disposing the spoke core portion connecting the ring core portion and the boss core portion, and the boss portion by the assembly portion A pseudo-spoke part formed using a protruding part that protrudes toward the extended covering part of the airbag device disposed on the upper surface side of the airbag device ;
It is comprised from these.

  The steering wheel according to the present invention includes a genuine spoke portion in which a plurality of spoke portions connecting the boss portion and the ring portion are provided with a spoke core metal portion that is covered with the spoke coating portion, a ring core metal portion, and a boss core metal. And a spoke part formed by an extended covering part extending from the ring covering part without disposing a spoke cored bar part connecting the parts.

  That is, in the steering wheel according to the present invention, the pseudo spoke portion is provided with an extended covering portion that extends the ring covering portion that covers the ring core portion, although the spoke core portion is not provided therein. The extended covering portion is not separately attached to the cored bar, but is formed by molding, and is integrally formed with the ring covering unit that is molded so as to wrap around the entire circumference of the ring cored bar portion. It does not come off the cored bar. As a result, the attachment stability of the pseudo spoke part is improved.

  In addition, since the pseudo spoke part can be formed without providing the spoke cored bar part, the same cored bar is used to form a part of the extended covering part that forms the pseudo spoke part provided in the coating layer forming die. If the shape is changed or the arrangement position is changed, it is possible to easily manufacture a steering wheel in which the design of the spoke portion is changed by changing the number and position of the pseudo spoke portions.

  Therefore, in the steering wheel according to the present invention, it is possible to easily change the design of the spoke portion while ensuring the mounting stability, and further, without changing the core metal, which is troublesome in design, The design of the spoke part can be easily changed only by changing the mold.

In the steering wheel according to the present invention, it is desirable that the spoke core metal part is configured as only two extending from the boss core metal part on both sides in the left-right direction.

  In such a configuration, the strength of the cored bar at the time of steering can be secured in a balanced manner as compared with the case where the number of spoked cored bar parts is one, and furthermore, compared with the case where the number of spoke cored bar parts is three or more. Since the space between the genuine spoke portions can be secured widely, the number of pseudo spoke portions and the degree of freedom of the arrangement position can be improved.

In the steering wheel according to the present invention, the covering layer includes both an inner layer that covers the core metal and an outer layer that covers the surface of the inner layer, including the inner layer that extends to the extending covering portion. As a two-layer structure consisting of
The inner layer is preferably formed with a lower density and higher rigidity than the outer layer.

  In such a configuration, the inner layer covering the cored bar in the coating layer is a foam material having a low density and rigidity (in other words, a low density but hard) with respect to the outer layer. The foam material has a high density and low rigidity with respect to the inner layer (in other words, a high density but a soft material).

  In other words, if all of the coating layer is made of a foam material of high density and low rigidity, which is the foam material of the outer layer, a soft soft feel can be obtained as a grip feeling, but because of the high density, the steering wheel is lightweight. It will inhibit the conversion. Conversely, if all of the coating layer is formed of a low-density, high-rigidity foam material that is the foam material of the inner layer, the weight can be further reduced, but since it is hard, a good feel cannot be obtained. Abrasion resistance cannot be ensured.

  Therefore, with the steering wheel having the above-described configuration, it is possible to achieve a good feel when gripped, achieve weight reduction, and obtain good wear resistance. Furthermore, since a rigid inner layer is also disposed in the extended covering portion, the pseudo spoke portion can ensure a predetermined strength with a good feeling even if it is not provided with a spoke mandrel portion.

  Of course, if this point is not taken into consideration, the covering layer including the extended covering portion may be formed not as a two-layer structure but as a one-layer type of synthetic resin that can ensure strength.

In the method for manufacturing a steering wheel according to the present invention, the steering wheel includes:
As a configuration comprising a ring part to be gripped at the time of steering, a boss part arranged at the center of the ring part, and a spoke part connecting the boss part and the ring part,
While comprising a metal cored bar that interconnects the ring part, the boss part, and the spoke part,
A ring cored bar portion disposed in the ring portion of the cored bar, a bossed cored bar portion disposed in the bossed portion, and a spoke cored bar portion disposed in the spoke portion;
The ring core metal part and the spoke core metal part in the vicinity of the ring core metal part, a synthetic resin coating layer formed by molding, the ring coating covering the ring core metal part A coating layer comprising a portion and a spoke covering portion that covers the spoke core portion,
The spoke part is
A genuine spoke part provided with the spoke core metal part to be covered with the spoke covering part;
A pseudo spoke portion formed by using an extended covering portion extending from the ring covering portion without disposing the spoke core portion connecting the ring core portion and the boss core portion. When,
As two types of
In manufacturing a plurality of steering wheels in which the genuine spoke part and the pseudo spoke part are appropriately arranged, the core bar is shared,
A cavity part where the ring covering part and the spoke covering part can be formed at the time of forming the covering layer at the time of manufacturing the steering wheel provided with the extending covering part, and a cavity where the extending covering part can be formed And using a mold provided with a part,
Producing using a mold provided with a cavity part capable of forming the ring covering portion and the spoke covering portion at the time of forming the covering layer at the time of manufacturing the steering wheel in which the extended covering portion is not disposed. Features.

  In the method for manufacturing a steering wheel according to the present invention, at the time of manufacturing a steering wheel provided with an extended covering portion, a cavity portion capable of forming the ring covering portion and the spoke covering portion, and a cavity capable of forming the extending covering portion If a core metal is set in a molding die provided with a portion, and a molding material for the coating layer is injected, it can be manufactured easily.

  Also, when manufacturing a steering wheel without an extended covering portion, when manufacturing a steering wheel with an extended covering portion provided in a mold having a cavity part capable of forming the ring covering portion and the spoke covering portion. If the same core metal as that used is set and the molding material for the coating layer is injected, it can be easily manufactured.

  That is, in the method for manufacturing a steering wheel of the present invention, a plurality of steering wheels having different numbers of spoke portions, in other words, a steering wheel provided with a predetermined number of pseudo spoke portions, and a steering wheel not provided with pseudo spoke portions. Can be easily manufactured by using only one type of mandrel and changing the mold of the coating layer.

  In addition, in the method for manufacturing a steering wheel according to the present invention, it is troublesome to design the strength and the like even when manufacturing the steering wheel having various appearance designs in which the shape, number and arrangement position of the pseudo spoke portions are changed. However, it is possible to easily cope with and manufacture the same by simply changing the mold without changing the cored bar.

And in the manufacturing method of the steering wheel concerning the present invention, as a steering wheel manufactured by sharing the core metal, at least one of the basic steering wheel provided with only the genuine spoke part and the genuine spoke part In manufacturing a modified steering wheel with a pseudo spoke part,
The basic molding die for molding the coating layer of the basic steering wheel and the deformation molding die for molding the coating layer of the modified steering wheel share the main body, corresponding to the difference in the shape of the coating layer to be molded. It is desirable to have a mold surface and a nest that is replaceably attached to the main body.

  In such a configuration, the appearance of various variations in which the shape, number, and position of the pseudo spokes are changed by changing the nesting without changing the basic mold or deformation mold body for forming the coating layer. A steering wheel having a design can be manufactured, and further, a steering wheel having an appearance design with various variations can be easily manufactured.

Furthermore , in the method for manufacturing a steering wheel according to the present invention, it is desirable that the spoke core metal part is configured as only two extending from the boss core metal part to both sides in the left-right direction.

  In such a configuration, the strength of the cored bar at the time of steering can be secured in a balanced manner as compared with the case where the number of spoked cored bar parts is one, and furthermore, compared with the case where the number of spoke cored bar parts is three or more. Since the space between the genuine spoke portions can be secured widely, the number of pseudo spoke portions and the degree of freedom of the arrangement position can be improved.

Furthermore , in the method for manufacturing a steering wheel of the present invention, the covering layer includes an inner layer that covers the core metal, and an outer layer that covers the surface of the inner layer, including the inner layer that extends to the extended covering portion, As a two-layer structure made of foam material,
The inner layer is preferably formed with a lower density and higher rigidity than the outer layer.

  With such a configuration, the manufactured steering wheel can have a good feel when gripped, can achieve weight reduction, and can also have good wear resistance. Furthermore, since a rigid inner layer is also disposed in the extended covering portion, the pseudo spoke portion can ensure a predetermined strength with a good feeling even if it is not provided with a spoke mandrel portion.

It is a top view of the steering wheel of a 1st embodiment of the present invention. It is a top view which shows the state which shape | molded the inner layer of the coating layer in the metal core of the steering wheel of 1st Embodiment. It is a schematic sectional drawing of the III-III site | part of FIG. It is a schematic sectional drawing of the IV-IV site | part of FIG. It is a schematic longitudinal cross-sectional view which shows the shaping | molding die for inner layers which shape | molds the inner layer in the coating layer of the steering wheel of 1st Embodiment. It is a schematic longitudinal cross-sectional view which shows the spoke coating | coated part vicinity at the time of shaping | molding of the inner-layer shaping | molding die used for 1st Embodiment. It is a schematic longitudinal cross-sectional view which shows the extension coating | cover part vicinity at the time of shaping | molding of the inner-layer shaping | molding die used for 1st Embodiment. It is a figure which shows the mold surface of one split mold at the time of the mold opening in the inner layer shaping | molding die used for 1st Embodiment. It is a schematic longitudinal cross-sectional view which shows the shaping | molding die for outer layers which shape | molds the outer layer in the coating layer of the steering wheel of 1st Embodiment. It is a schematic longitudinal cross-sectional view which shows the spoke coating | cover part vicinity at the time of shaping | molding of the outer-layer shaping | molding die used for 1st Embodiment. It is a schematic longitudinal cross-sectional view which shows the extension coating | cover part vicinity at the time of shaping | molding of the outer layer shaping | molding die used for 1st Embodiment. It is a top view of the steering wheel (basic steering wheel) provided only with the genuine spoke part manufactured using the metal core of the steering wheel of a 1st embodiment. It is a top view which shows the state which shape | molded the inner layer of the coating layer on the metal core of the basic steering wheel shown in FIG. It is a schematic sectional drawing of the XIV-XIV site | part of FIG. It is a schematic sectional drawing of the XV-XV site | part of FIG. It is a schematic longitudinal cross-sectional view which shows the spoke coating | cover part vicinity of the shaping | molding die for inner layers which shape | molds the inner layer in the coating layer of the basic steering wheel shown in FIG. It is a schematic longitudinal cross-sectional view of the vicinity of the nest | exchange replaced | exchanged for the extended coating | coated part at the time of shaping | molding of the inner layer shaping | molding die used for manufacture of the basic steering wheel shown in FIG. It is a figure which shows the mold surface of one split mold at the time of mold opening of the inner-layer shaping | molding die used for manufacture of the basic steering wheel shown in FIG. It is a schematic longitudinal cross-sectional view which shows the shaping | molding die for outer layers which shape | molds the outer layer in the coating layer of the basic steering wheel shown in FIG. It is a schematic longitudinal cross-sectional view which shows the spoke coating | cover part vicinity of the shaping | molding die for outer layers used for manufacture of the basic steering wheel shown in FIG. It is a schematic longitudinal cross-sectional view of the vicinity of the nest | exchange to replace | exchange for the extended coating | coated part at the time of shaping | molding of the outer layer shaping | molding die used for manufacture of the basic steering wheel shown in FIG. It is a top view of the steering wheel of a 2nd embodiment. It is a top view which shows the state which shape | molded the inner layer of the coating layer in the metal core of the steering wheel of 2nd Embodiment. It is a schematic sectional drawing of the XXIV-XXIV site | part of FIG. It is a schematic sectional drawing of the XXV-XXV site | part of FIG. It is a schematic longitudinal cross-sectional view which shows the spoke coating | cover part vicinity at the time of shaping | molding of the shaping | molding die for inner layers which shape | molds the inner layer of the steering wheel of 2nd Embodiment. It is a schematic longitudinal cross-sectional view which shows the extension coating | cover part vicinity at the time of shaping | molding of the inner-layer shaping | molding die used for 2nd Embodiment. It is a figure which shows the mold surface of one split mold at the time of the mold opening in the inner layer shaping | molding die used for 2nd Embodiment. It is a schematic longitudinal cross-sectional view which shows the shaping | molding die for outer layers which shape | molds the outer layer of the steering wheel of 2nd Embodiment. It is a schematic longitudinal cross-sectional view which shows the spoke coating | coated part vicinity at the time of shaping | molding of the outer-layer shaping | molding die used for 2nd Embodiment. It is a schematic longitudinal cross-sectional view which shows the extension coating | cover part vicinity at the time of shaping | molding of the outer-layer shaping | molding die used for 2nd Embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A steering wheel WA according to a first embodiment is used for steering a vehicle as shown in FIG. The portion R, the boss portion B disposed in the center of the ring portion R, and the spoke portion S that connects the boss portion B and the ring portion R are configured.

  The steering wheel WA is provided with a metal core 11 such as an aluminum alloy that interconnects the ring part R, the boss part B, and the spoke part S as shown in FIGS. Has been. The steering wheel WA includes a boss part component 50 (50A) disposed in the boss part B and a steering wheel body 10 (10A) as constituent parts. The boss part component 50A includes an airbag device 51 disposed on the upper surface side of the boss part B and a synthetic resin lower cover 52 that covers the lower surface of the boss part B.

  The air bag device 51 pushes and opens the synthetic resin cover 51a on the outer surface side in the event of a vehicle collision, deploys and inflates an air bag (not shown) from the inside, and protects the driver with the inflated air bag. is there.

  Further, the steering wheel main body 10A includes the core metal 11 described above, and a synthetic resin coating layer 30 (30A) formed by molding such as injection molding so as to cover the core metal 11. ing.

The core metal 11 includes a ring core metal part 13 disposed in the ring part R, a boss core metal part 15 disposed in the boss part B, and a spoke core metal part 20 disposed in the spoke part S. ing. The boss mandrel 15 includes a fastening cylinder 16 made of a steel material or the like for assembling the steering wheel WA to the steering shaft SS, and a mounting portion 17 disposed on the periphery thereof. The spoke mandrel portions 20 and 20 extend. The attachment portion 17 is formed with a plurality of assembly portions 25 having assembly holes for assembling the airbag device 51 and a plurality of assembly portions 26 having assembly holes for assembling the lower cover 52. Is formed. In the case of the embodiment, the assembling part 25 for assembling the airbag device 51 includes the left and right sides that are the spoke core parts 20 and 20 around the fastening cylinder part 16, and the rear side of the pseudo spoke part ST that will be described later. Are arranged in three places.

  The covering layer 30 </ b> A covers the ring core metal part 13 and the spoke core metal part 20 in the vicinity of the ring core metal part 13. That is, as the covering layer 30 </ b> A, a ring covering portion 40 that covers the ring core metal portion 13, a spoke covering portion 47 that covers the spoke core metal portion 20, and an extended covering portion 45 that extends from the ring covering portion 40. And is configured. The extended covering portion 45 is formed extending from the ring covering portion 40 without disposing the spoke core portion 20 that connects the ring core portion 13 and the boss core portion.

In the case of the first embodiment, the extended covering portion 45 is disposed so as to extend forward from the rear portion RB of the ring portion R, and protrudes rearward on the extended covering portion 45 side of the boss component 50A. At the same time, the rear spoke portion SB is formed.

  That is, in the steering wheel WA of the first embodiment, the spoke part S that connects the boss part B and the ring part R includes two front left and right spoke parts SFL and front right spoke part SFR of the front spoke part SF. It is configured as a three-spoke type including one rear spoke portion SB. The front left spoke portion SFL and the front right spoke portion SFR are the genuine spoke portions ST provided with the spoke core portions 20 and 20 covered by the spoke covering portion 47, and the rear spoke portion SB is the ring core rod. As a pseudo-spoke part SP formed by using the extended covering part 45 extending from the ring covering part 40 without disposing the spoke core part 20 connecting the part 13 and the boss core part 15. It is configured.

  Further, in the steering wheel WA according to the first embodiment, the coating layer 30 </ b> A includes the inner layer 31 that covers the core metal 11 and the inner layer 31 that extends to the extended coating portion 45, and the outer layer 32 that covers the surface of the inner layer 31. And a two-layer structure made of foam material. The inner layer 31 is formed with lower density and higher rigidity than the outer layer 32. In other words, the inner layer 31 is a foam material having a low density and rigidity with respect to the outer layer 32 (that is, a foam material that is low in density but hard), and conversely, the outer layer 32 has a higher density than the inner layer 31. And a foam material having low rigidity (that is, a soft material with high density). The inner layer 31 and the outer layer 32 are preferably made of the same type of foam material that adheres well to each other. In the embodiment, the inner layer 31 and the outer layer 32 are made of polyurethane foam.

Further, in the embodiment, the inner layer 31 is 0.1 g / cm ³ within a density of 0.05 to 0.2 g / cm ^3, the outer layer 32, the density 0.3~4.5g / cm ³ Within the range of 0.4 g / cm ³ .

The density of the inner layer 31, is less than 0.05 g / cm ^3, it is difficult to secure the rigidity, also exceed 0.2 g / cm ³ inhibits the weight of the coating layer 30.

In addition, if the density of the outer layer 32 is less than 0.3 g / cm ^3, it is difficult to ensure wear resistance, and if it exceeds 4.5 g / cm ³ , the weight reduction of the coating layer 30A is unfavorable. Therefore, the outer layer 32 is in the range of density of 0.3~4.5g / cm ^3, preferably, more in the range of 0.3 to 0.5 g / cm ³ which attained the weight reduction is desirable.

Furthermore, the inner layer 31 has a hardness of 75 in the range of 60 to 95 in Shore A hardness, and the outer layer 32 has a hardness of 40 in the range of 30 to 60 in Shore A hardness.
Further, in the case of the embodiment, the ring covering portion 40 is configured to form a fitting portion for fitting the inner layer 31 and the outer layer 32 together so as to prevent the outer layer 32 from rotating with respect to the inner layer 31. A groove 31a is formed in the lower surface portion of the portion R, and a protrusion 32a that fits into the groove 31a is formed in the outer layer 32. In the case of the embodiment, the groove 31a and the protrusion 32a are formed over the entire circumference of the ring portion R, but may be provided intermittently.

  In addition, it is desirable that the thickness of the outer layer 32 covering the inner layer 31 in the ring portion R is 3 mm within the range of 2 to 4 mm except for the portion of the protrusion 32a, and is uniform around the inner layer 31. Incidentally, if the thickness of the outer layer 32 is less than 2 mm, the tactile sensation of the inner layer 31 is generated, and if it exceeds 4 mm, a situation in which weight reduction is hindered is likely to occur.

  Two types of molds MA used for manufacturing the steering wheel WA of the first embodiment are an inner layer mold 60 (60A) shown in FIGS. 5 to 8 and an outer layer mold 80 (80A) shown in FIGS. Is used.

  As shown in FIGS. 5 to 8, the inner layer mold 60 </ b> A includes two split dies 71 (71 </ b> A <b> 1 and 71 </ b> A <b> 2) that form cavities 67 (67 </ b> A) that can mold the inner layer 31 of the coating layer 30 </ b> A when the mold is clamped. A gate 63 for injecting the molding material PR1 of the inner layer 31 into the cavity 67A is provided, and further, support portions 64, 65, and 66 for supporting predetermined portions of the core metal 11 are provided.

  Each of these split molds 71A1 and 71A2 includes a main body 72 (72A1 and 72A2) and a plurality of inserts 73 (73A), 74 (74A), and 75 (75A).

  The inserts 73A, 74A, and 75A are provided with an inner projecting covering portion 43 extending from the ring covering portion 40 to the boss portion B side in the covering layer 30A, that is, a portion where the extending covering portion 45 and the spoke covering portion 47 are disposed. Cavity portions 67a and 67b capable of forming the ring covering portion 40 in the vicinity are provided, and the main body 72 is a portion of the covering layer 30A where the nestings 73A, 74A, and 75A are not provided, in other words, the inside of the ring covering portion 40 A cavity mold surface 72a capable of forming a portion away from the protruding covering portion 43 is provided.

  The main body 72 includes nesting storage portions 72b, 72c, and 72d that store and hold the nestings 73A, 74A, and 75A.

  The nesting 73A is for forming the spoke covering portion 47 of the front left spoke portion SFL as the genuine spoke portion ST and the ring covering portion 40 in the vicinity thereof, and the slits 73A1, 73A2 each having a predetermined cavity mold surface 73a. It is composed of

  The insert 74A forms the spoke covering portion 47 of the front right spoke portion SFR as the genuine spoke portion ST and the ring covering portion 40 in the vicinity thereof, and the slits 74A1 and 74A2 each having a predetermined cavity mold surface 74a. It is composed of

  The insert 75A is for forming the extended covering portion 45 of the rear spoke portion SB as the pseudo spoke portion SP and the ring covering portion 40 in the vicinity thereof, and a split 75A1, which includes a predetermined cavity mold surface 75a. 75A2.

  The split members 73A1, 74A1, and 75A1 are assembled to the main body 72A1 of the split mold 71A1 so that they can be replaced (replaceable), and the split elements 73A2, 74A2, and 75A2 can be replaced with the main body 72A2 of the split mold 71A2. It is assembled to.

  As shown in FIGS. 9 to 11, the outer layer forming die 80A includes two split dies 91 (91A1, 91A2) that form cavities 87 (87A) capable of forming the outer layer 32 of the covering layer 30A when the mold is clamped. A gate 83 for injecting the molding material PR2 of the outer layer 32 into the cavity 87A is provided, and support parts 84, 85, 86 for supporting predetermined portions of the core metal 11 are provided.

  Each of these split molds 91A1 and 91A2 includes a main body 92 (92A1 and 92A2) and a plurality of inserts 93 (93A), 94 (94A), and 95 (95A).

  The nestings 93A, 94A, and 95A are located in the vicinity of the portion where the extended covering portion 45 and the spoke covering portion 47 that are the inner protruding covering portions 43 extending from the ring covering portion 40 of the covering layer 30A to the boss portion B side are disposed. , And the main body 92 is a portion of the coating layer 30A where the inserts 93A, 94A, and 95A are not provided, in other words, the inner side of the ring coating portion 40. A cavity mold surface 92a capable of forming a part away from the protruding covering portion 43 is provided.

  Of course, the main body 92 also includes nested storage portions 92b, 92c, and 92d that store and hold the nested portions 93A, 94A, and 95A, as with the inner layer mold 60A.

  The insert 93A is for forming the spoke covering portion 47 of the front left spoke portion SFL as the genuine spoke portion ST and the ring covering portion 40 in the vicinity thereof, and a split 93A1, 93A2 having a predetermined cavity mold surface 93a. It is composed of

  The insert 94A is for forming the spoke covering portion 47 of the front right spoke portion SFR as the genuine spoke portion ST and the ring covering portion 40 in the vicinity thereof, and the slits 94A1, 94A2 having predetermined cavity mold surfaces 94a. It is composed of

  The insert 95A is for forming the extended covering portion 45 of the rear spoke portion SB as the pseudo spoke portion SP and the ring covering portion 40 in the vicinity thereof, and a split 95A1, which has a predetermined cavity mold surface 95a. 95A2.

  Note that the splits 93A1, 94A1, and 95A1 are assembled to the main body 92A1 of the split mold 91A1 so that they can be replaced (replaceable), and the splits 93A2, 94A2, and 95A2 can be replaced with the main body 92A2 of the split mold 91A2 (replaceable). It is assembled to.

  Further, the inserts 75A and 95A for forming the vicinity of the extended covering portion 45 in the inner layer forming die 60A and the outer layer forming die 80A together with the insert storage portions 72d and 92d are in a direction orthogonal to the mold opening direction, in other words, the steering wheel WA. The length in the left-right direction is longer than the dimension of the extension covering portion 45 itself. The reason is that the inserts 75A and 95A housed in the insert housing portions 72d and 92d are shown in FIG. 27 so that the four-spoke type steering wheel WC of the second embodiment shown in FIG. This is because the steering wheel WC is manufactured by replacing the inserts 75C and 95C that require long dimensions in the left-right direction shown in FIGS.

  At the time of manufacturing the steering wheel WA of the first embodiment, the inner layer forming die 60A shown in FIGS. The material PR1 is injected to mold the inner layer 31, and the molded product (shown in FIG. 2) Ma that has been opened and released is taken out. Thereafter, the outer layer molding die 80A shown in FIGS. 9 to 11 is opened, the molded product Ma is set, and after clamping, the molding material PR2 is injected into the cavity 87A, the outer layer 32 is molded, and taken out. The steering wheel main body 10A of the steering wheel WA can be obtained. Thereafter, if the boss component 50A is assembled, the three-spoke type steering wheel WA of the first embodiment can be manufactured.

  As described above, in the steering wheel WA of the first embodiment, the plurality of spoke portions S that connect the boss portion B and the ring portion R are provided with the spoke core metal portion 20 that is covered with the spoke covering portion 47. Without disposing the spoke core ST 20 (the front left spoke SFL and the front right spoke SFR), and the spoke core 20 connecting the ring core 13 and the boss core 15 from the ring cover 40 And a pseudo spoke portion SP (rear side spoke portion SB) formed by using the extended covering portion 45 that is extended.

  That is, in the steering wheel WA of the first embodiment, the pseudo spoke portion SP is not provided with the spoke core metal portion 20 inside, but the ring covering portion 40 that covers the ring core metal portion 13 is extended. The covering portion 45 is provided, and the extending covering portion 45 is not separately attached to the cored bar 11 but is formed by molding (in the embodiment, injection molding) of the molding die MA (60A, 80A). The ring core part 13 is formed integrally with the ring cover part 40 so as to wrap around the entire circumference of the ring core part 13, and does not come off the core metal 11. As a result, the attachment stability of the pseudo spoke part SP becomes good.

  Further, since the pseudo spoke portion SP can be formed without providing the spoke core metal portion 20, the extended core portion 45 of the extended covering portion 45 that forms the pseudo spoke portion SP provided in the coating mold of the coating layer using the same core metal 11 is used. If the number or shape of the molded part is changed, or if the arrangement position is changed (see FIG. 22), the number of the pseudo spokes SP is changed and the design of the spokes S is changed. Can also be easily manufactured.

  Therefore, in the steering wheel WA of the first embodiment, the design of the spoke portion S can be easily changed while securing the mounting stability, and further, without changing the core metal 11 that is troublesome in design. The design of the spoke portion S can be easily changed only by changing the mold of the covering layer.

  Incidentally, when the cored bar 11 is shared, the second embodiment of FIG. 22 in which the number of the basic steering wheel WB shown in FIG. 12 with only the genuine spoke part ST without the pseudo spoke part SP and the number of the pseudo spoke parts SP is increased. The modified steering wheel WC having the form can be manufactured.

  As shown in FIGS. 12 to 15, the basic steering wheel WB shares the core 11 of the first embodiment, and the right and left genuine spoke portions ST (front left spoke portion SFL, front right spoke) of the first embodiment. Portion SFR) is formed in substantially the same shape.

  However, since the rear portion RB of the ring portion R does not include the pseudo spoke portion SP (rear side spoke portion SB) of the first embodiment, the steering wheel main body 10B of the steering wheel WB is extended from the first embodiment. The installation cover 45 is not provided, and the boss component 50B does not include the protrusion 50Aa of the first embodiment.

  The covering layer 30B has a two-layer structure of an inner layer 31 and an outer layer 32, as in the first embodiment.

  Note that parts similar to those in the first embodiment, including the mold, are appropriately substituted with the letter B instead of the letter A, but are given the same reference numerals as much as possible, and the description thereof is omitted.

  And when the molding die used at the time of manufacture of the basic steering wheel WB is the deformation molding die MA made of the molding dies 60A and 80A of the first embodiment, the ring core metal portion 13 and the ring core metal in the core metal 11 are used. The basic forming die MB for forming the covering layer 30B covering the spoke core member 20 in the vicinity of the portion 13, and the inner layer forming die 60B shown in FIGS. 16-18 and the outer layer forming die 80B shown in FIGS. Are used.

  As shown in FIGS. 16 to 18, the inner layer mold 60B includes two split dies 71B1 and 71B2 that form cavities 67B that can mold the inner layer 31 of the coating layer 30B during mold clamping, and the inner layers in the cavity 67B. 31 includes a gate 63 (see FIG. 18) for injecting 31 molding material PR1, and further includes support portions 64, 65, and 66 that support predetermined portions of the core metal 11.

  Each of these split molds 71B1 and 71B2 includes a main body 72B1 and 72B2 and a plurality of inserts 73B, 74B, and 75B.

  Since the spoke covering portions 47 have the same shape, the inserts 73B and 74B are composed of splits (73B1, 73B2, 74B1, and 74B2) having cavity mold surfaces 73a and 74a similar to the inserts 73A and 74A. Has been.

  However, since the steering wheel WB does not include the extended covering portion 45, the insert 75 </ b> B positioned at the position where the rear spoke portion SB is disposed includes a cavity die surface 75 a capable of forming the ring covering portion 40. It consists of 75B1 and 75B2.

  Of course, the inserts 73B, 74B, and 75B are stored in the insert storage portions 72b, 72c, and 72d provided in the main body 72 of the molding die 60B shared with the main body 72 of the molding die 60A.

  Since the basic steering wheel WB is the same as the spoke covering portion 47 of the first embodiment, the same inserts 73B and 74B as the inserts 73A and 73A are used. Therefore, if only the steering wheel WA and the steering wheel WB are manufactured, the inserts 73A, 73B, 74A, and 74B may be formed integrally with the main body 72 without using the insert structure.

  As shown in FIGS. 19 to 21, the outer layer forming die 80B includes two split dies 91B1 and 91B2 that form a cavity 87B capable of forming the outer layer 32 of the coating layer 30B at the time of clamping, and the outer layer in the cavity 87B. A gate 83 for injecting 32 molding materials PR2 is provided, and further, support portions 84, 85, 86 for supporting predetermined portions of the core metal 11 are provided.

  Each of these split molds 91B1 and 91B2 includes a main body 92B1 and 92B2 and a plurality of inserts 93B, 94B, and 95B.

  Since the spoke covering portions 47 have the same shape, the inserts 93B and 94B are composed of split members (93B1, 93B2, 94B1, 94B2) having cavity mold surfaces 93a and 94a similar to the inserts 93A and 94A. Has been.

  However, since the steering wheel WB does not include the extended covering portion 45, the insert 95B positioned at the rear portion spoke portion SB of the steering wheel WA (the rear portion RB of the ring portion R) forms the ring covering portion 40. It consists of splits 95B1 and 95B2 with possible cavity mold surfaces 95a.

  Of course, each of the inserts 93B, 94B, and 95B is stored in insert storage portions 92b, 92c, and 92d provided in the main body 92 of the molding die 80B that is shared with the main body 92 of the molding die 80A.

  Since the basic steering wheel WB is the same as the spoke covering portion 47 of the first embodiment, the same inserts 93B and 94B as the inserts 93A and 93A are used. Therefore, if only the steering wheel WA and the steering wheel WB are manufactured, the inserts 93A, 93B, 94A, and 94B may be formed integrally with the main body 92 without using the insert structure.

  When manufacturing this basic steering wheel WB, the inner layer forming die 60B shown in FIGS. 16 to 18 is opened, the core metal 11 is set, and after clamping, the molding material PR1 for the inner layer 31 is injected into the cavity 67B. Then, the inner layer 31 is molded, and the molded product (shown in FIG. 13) Mb that has been opened and released is taken out. After that, the outer layer molding die 80B shown in FIGS. 19 to 21 is opened, the molded product Mb is set, and after clamping, the molding material PR2 is injected into the cavity 87B, and the outer layer 32 is molded and taken out. The steering wheel main body 10B of the steering wheel WB can be obtained. Then, if the boss | hub part component 50B is assembled | attached, the two-spoke type steering wheel WB can be manufactured.

  Further, the modified steering wheel WC of the second embodiment shown in FIG. 22 will be described. The steering wheel WC includes the basic steering wheel WB, the steering wheel WA of the first embodiment (also referred to as a modified steering wheel WA), and a cored bar. 11 is a 4-spoke type, but the front left spoke part SFL and front right spoke part SFR are configured as the genuine spoke part ST, and the rear rear left spoke part SBL and rear right spoke. The part SBR is configured as a pseudo spoke part SP.

  That is, the rear left spoke portion SBL and the rear right spoke portion SBR are covered without providing the spoke core metal portion 20 (see FIGS. 22, 23, 24) as shown in FIGS. The extended covering portion 45 is formed by extending the ring covering portion 40 in the layer 30C, and the extended boss portion 50C is connected to the rear left spoke portion SBL and the rear right spoke portion SBR. A protruding portion 50Ca protruding toward the portion 45 is provided.

  The covering layer 30C has a two-layer structure of an inner layer 31 and an outer layer 32, as in the first embodiment.

  Further, in the steering wheel WC of the second embodiment, the four-spoke type is used, and although the cored bar 11 is shared, the spoke covering portion 47C of the front left spoke portion SFL and the front right spoke portion SFR is in the front-rear direction. The boss portion component 50C is also made to correspond to the portion connected to the spoke covering portion 47C by reducing the width size.

  In the second embodiment, the same parts as in the first embodiment, including the mold, are appropriately inserted with the letter C instead of the letter A, but are given the same reference numerals as much as possible. Is omitted.

  Two types of molds (deformation molds) MC used when manufacturing the steering wheel WC of the second embodiment are an inner layer mold 60C shown in FIGS. 26 to 28 and an outer layer mold 80B shown in FIGS. used.

  In these molding dies 60C and 80C, the main body 72C1, 72C2, 92C1, and 92C2 of the split molds 71C1, 71C2, 91C1, and 91C2 are molded because of the difference between the shape of the spoke coating portion 47C and the two extended coating portions 45. Although shared with the main bodies 72, 92 of the molds 60A, 60B, 80A, 80B, the nesting 73C, 74C, 75C, 93C, 94C, 95C is made different from the nesting of the molding dies 60A, 60B, 80A, 80B. The slits 73C1, 73C2, 74C1, 74C2, having predetermined cavity mold surfaces 73a, 74a, 75a, 93a, 94a, 95a so that the spoke covering portion 47C and the two extended covering portions 45 can be formed. 75C1, 75C2, 93C1, 93C2, 94C1, 94C2, 95C1, and 95C2.

  In other words, although the main bodies 72C1, 72C2, 92C1, and 92C2 are shared, the molds 60C and 80C are cavities 67C that mold the inner layer 31 and the outer layer 32 as compared with the molds 60A, 60B, 80A, and 80B. , 87C, the cavity portions 67a, 87a in the vicinity of the genuine spoke portion ST and the cavity portions 67b, 87b in the vicinity of the pseudo spoke portion SP are replaced with the corresponding predetermined inserts 73C, 74C, 75C, 93C, 94C, 95C. Has been configured.

  Of course, the inserts 73C, 74C, 75C, 93C, 94C, and 95C are stored and held in the insert storage portions 72b, 72c, 72d, 92b, 92c, and 92d of the main bodies 72 and 92 of the molds 60C and 80C.

  And at the time of manufacture of this steering wheel WC, as in the first embodiment, the inner layer molding die 60C shown in FIGS. 26 to 28 is opened, the core metal 11 is set, and after clamping, The molding material PR1 for the inner layer 31 is injected, the inner layer 31 is molded, the molded product (the one shown in FIG. 22) Mc which is opened and released is taken out, and then the outer layer molding die 80C shown in FIGS. The mold is opened, the molded product Mc is set, and after the mold is clamped, the molding material PR2 is injected into the cavity 87C, the outer layer 32 is molded, and the steering wheel main body 10C of the steering wheel WC can be obtained. it can. Thereafter, when the boss component 50C is assembled, the four-spoke steering wheel WC of the second embodiment can be manufactured.

  As described above, even in the steering wheel WC of the second embodiment, a plurality of spoke portions S that connect the boss portion B and the ring portion R are provided with the spoke core metal portion 20 that is covered with the spoke covering portion 47C. Without disposing the spoke core ST 20 (the front left spoke SFL and the front right spoke SFR), and the spoke core 20 connecting the ring core 13 and the boss core 15 from the ring cover 40 A pseudo spoke part SP (rear left spoke part SBL, rear right spoke part SBR) formed by using the extended covering parts 45, 45 is provided.

That is, even in the steering wheel WC of the second embodiment, the pseudo spoke portion SP is not provided with the spoke core metal portion 20 inside, but the ring covering portion 40 that covers the ring core metal portion 13 is extended. It is configured by providing a covering portion 45,
The extended covering portion 45 is not separately attached to the cored bar 11 but is formed by molding (in the embodiment, injection molding) of the molding die MC (60C, 80C), and the entire circumference of the ring cored bar portion 13 is formed. It is formed integrally with the ring covering portion 40 formed so as to be wrapped, and does not come off the core metal 11. As a result, the attachment stability of the pseudo spoke part SP becomes good.

  Further, since the pseudo spoke portion SP can be formed without providing the spoke core metal portion 20, the pseudo spoke portion SP provided in the molds MA and MC of the coating layers 30A and 30C is formed using the same core metal 11. Steering in which the design of the spoke portion S is changed by changing the number and position of the pseudo spoke portions SP if the number or shape of the extension covering portion 45 is changed or the arrangement position is changed. The wheel can be easily manufactured.

  Therefore, like the steering wheels WA and WC of the first and second embodiments, the design of the spoke portion S can be easily changed while ensuring the mounting stability, and moreover, the core metal that takes time and effort to design The design of the spoke portion S can be easily changed only by changing the molding dies MA and MC of the coating layers 30A and 30C without changing 11.

  Furthermore, in the steering wheels WA and WC of the first and second embodiments, the spoke core metal part 20 including the basic steering wheel WB is configured as only two that extend from the boss core metal part 15 to both sides in the left-right direction. ing. Therefore, the strength of the cored bar 11 during steering can be ensured in a balanced manner as compared with the case where the spoke cored bar part 20 is one, and further, the ring is compared with the case where the spoke cored bar part is three or more. Since a wide space between the genuine spoke portions ST in the rear portion RB of the portion R can be ensured, the number of pseudo spoke portions SP and the degree of freedom of the arrangement position can be improved.

  Furthermore, in the steering wheels WA and WC of the first and second embodiments, the covering layer 30 (30A, 30B, and 30C) extends to the inner layer 31 that covers the core metal 11 and the extended covering portion 45 together with the basic steering wheel WB. Both the inner layer 31 provided and the outer layer 32 covering the surface of the inner layer 31 have a two-layer structure made of a foam material. The inner layer 31 is formed with a lower density and higher rigidity than the outer layer 32.

  Therefore, the inner layer 31 covering the cored bar 11 in the covering layer 30 is a foam material having a low density and rigidity (in other words, a low density but hard) with respect to the outer layer 32. The foam material is high in density and low in rigidity with respect to the inner layer 31 (in other words, it is soft although it has a high density).

  That is, if all of the covering layer 30 is formed of a high-density, low-rigidity foam material that is the foam material of the outer layer 32, a soft soft feel can be obtained as a grip feeling, but the steering wheel has a high density. The weight reduction of WA, WB, and WC will be hindered. Conversely, if all of the coating layer 30 is formed of a low-density high-rigidity foam material that is the foam material of the inner layer 31, it can be further reduced in weight, but because it is hard, a good feel cannot be obtained, Also, wear resistance cannot be ensured.

  Therefore, the steering wheels WA, WB, and WC having the above-described configuration can achieve a good feel when gripped, can achieve a reduction in weight, and can also have good wear resistance. Furthermore, since the rigid inner layer 31 is also disposed in the extended covering portion 45, the pseudo spoke portion SP has a predetermined strength with a good feeling even if it does not include the spoke mandrel portion 20. Can also be secured.

  Of course, if this point is not taken into consideration, the covering layer 30 including the extended covering portion 45 may be formed as a one-layer type of synthetic resin that can ensure strength, not a two-layer structure. Incidentally, in this case, a predetermined cover material such as natural leather or artificial leather may be wound around the surface of the coating layer so as to improve the feel.

  Further, in the steering wheels WA and WC provided with the extended covering portion 45 of the first and second embodiments, the cavity portions 67a and 87a in which the ring covering portion 40 and the spoke covering portions 47 and 47C can be formed at the time of manufacture, The cored bar 11 is set in the forming dies 60A, 60C, 80A, 80C provided with the cavity portions 67b, 87b capable of forming the extended covering portion 45, and the molding materials PR1, PR2 for the covering layers 30A, 30C Can be easily manufactured.

  Further, at the time of manufacturing the steering wheel WB in which the extended covering portion 45 is not disposed, the extended covering portion is formed on the forming dies 60B and 80B provided with the cavity portions 67a and 87a capable of forming the ring covering portion 40 and the spoke covering portion 47. If the same metal core 11 as used when manufacturing the steering wheels WA and WC with the 45 disposed thereon is set and the molding materials PR1 and PR2 for the coating layer 30B are injected, it can be manufactured easily.

  That is, in the manufacturing method of the steering wheel WA, WB, WC of the embodiment, a plurality of steering wheels WA, WB, WC with different numbers of spoke portions S, in other words, a predetermined number of pseudo spoke portions SP are provided. The steering wheel WA, WC and the steering wheel WB not provided with the pseudo-spoke part SP are formed using one type of cored bar 11 and the molds 60A, 60B, 60C, 80A, 80B of the coating layers 30A, 30B, 30C, It can be easily manufactured by simply changing 80C.

  In addition, in the manufacturing method of the steering wheel WA, WB, WC of the embodiment, even when manufacturing the steering wheel of various appearance designs in which the shape, number, and arrangement position of the pseudo spoke portion SP are changed, Without changing the mandrel 11 that takes time and effort to design the strength and the like, it is possible to easily handle and manufacture by simply changing the molds 60A, 60B, 60C, 80A, 80B, and 80C. .

  In particular, in the manufacturing method of the embodiment, as a steering wheel manufactured using the core metal 11 in common, the basic steering wheel WB including only the genuine spoke part ST, and at least one pseudo spoke part SP in addition to the genuine spoke part ST. Are manufactured, a basic forming die MB for forming the covering layer 30B of the basic steering wheel WB, and a deforming forming die for forming the covering layers 30A, 30C of the deformed steering wheels WA, WC. MA and MC share the main bodies 72 and 92, and have corresponding cavity mold surfaces 73a, 74a, 75a, 93a, 94a, and 95a at different portions of the shape of the coating layers 30A, 30B, and 30C to be molded. Nests 73A, 73B, 73C, 74 that are replaceably attached to the main bodies 72, 92 , 74B, 74C, 75A, 75B, 75C, 93A, 93B, 93C, 94A, 94B, 94C, 95A, 95B, is configured to include a 95C.

  In such a configuration, the inserts 73A, 73B, 73C, 74A, 74B, 74C, 75A, and 75B are not changed without changing the main bodies 72 and 92 of the basic mold MB and the deformation molds MA and MC for forming the coating layer 30. , 75C, 93A, 93B, 93C, 94A, 94B, 94C, 95A, 95B, 95C only by changing the shape, number, and position of the pseudo-spoke SP, produce various types of exterior design steering wheels. However, it is possible to further easily manufacture a steering wheel having various appearance designs.

  In each embodiment, 2 to 4 spoke type steering wheels have been exemplified. However, a steering wheel provided with 1, 2, 3 or more pseudo-spoke parts SP with one genuine spoke part ST, or a genuine spoke. The present invention may be applied to a steering wheel provided with a plurality of portions ST and having 1, 2, 3 or more pseudo spoke portions SP.

DESCRIPTION OF SYMBOLS 11 ... Core metal, 13 ... Ring core metal part, 15 ... Boss metal core part, 20 ... Spoke core metal part, 30 (A, B, C) ... Covering layer, 31 ... Inner layer, 32 ... Outer layer, 40 ... Ring coating Part, 45 ... extension covering part, 47, 47C ... spoke covering part,
60 (A, B, C) ... inner layer mold, 67 (A, B, C) ... cavity, 67a ... cavity part (near the genuine spoke part), 67b ... cavity part (near the pseudo spoke part), 71 ( A1, A2, B1, B2, C1, C2) ... split mold, 72 (A1, A2, B1, B2, C1, C2) ... main body, 72a ... cavity surface, 73 (A, B, C) ( Nest, 73a ... cavity surface, 74 (A, B, C) ... (spoke sheath) insert, 74a ... cavity surface, 75 (A, B, C) ... (extension) Nesting for coating part), 75a ... mold surface for cavity,
80 (A, B, C) ... outer layer mold, 87 (A, B, C) ... cavity, 87a ... cavity part (near the genuine spoke part), 87b ... cavity part (near the pseudo spoke part), 91 ( A1, A2, B1, B2, C1, C2) ... split mold, 92 (A1, A2, B1, B2, C1, C2) ... main body, 92a ... cavity mold surface,
93 (A, B, C) ... (for spoke covering portion) nest, 93a ... cavity surface, 94 (A, B, C) ... (for spoke covering portion) nest, 94a ... cavity surface, 95 ( A, B, C) ... (for extended covering), 95a ... cavity surface,
WA (deformation / first embodiment) steering wheel, WB (basic) steering wheel, WC (deformation / second embodiment) steering wheel,
R ... Ring part, B ... Boss part, S ... Spoke part, ST ... Authentic spoke part, SP ... Pseudo spoke part, MA ... Deformation mold, MB ... Basic mold, MC ... Deformation mold.

Claims (8)

As a configuration comprising a ring part to be gripped at the time of steering, a boss part arranged at the center of the ring part, and a spoke part connecting the boss part and the ring part,
A metal cored bar that interconnects the ring part, the boss part, and the spoke part is disposed,
The core bar includes a ring core bar part disposed in the ring part, a boss core bar part disposed in the boss part, and a spoke core bar part disposed in the spoke part,
The ring core metal part and the spoke core metal part in the vicinity of the ring core metal part are covered with a coating layer made of a synthetic resin,
The covering layer is a steering wheel configured to include a ring covering portion that covers the ring core metal portion and a spoke covering portion that covers the spoke core metal portion,
An airbag device is disposed on the upper surface side of the boss portion,
A plurality of assembly portions for disposing the airbag device are disposed around a fastening tube portion for fastening the boss core portion with a steering shaft in the core.
A plurality of the spoke portions are disposed,
A genuine spoke part provided with the spoke core metal part to be covered with the spoke covering part;
An extension covering portion extending from the ring covering portion without disposing the spoke core portion connecting the ring core portion and the boss core portion, and the boss portion by the assembly portion A pseudo-spoke part formed using a protruding part that protrudes toward the extended covering part of the airbag device disposed on the upper surface side of the airbag device ;
A steering wheel characterized by comprising: 2. The steering wheel according to claim 1, wherein the assembling portion is disposed at three positions on the left and right sides and the rear side around the fastening cylinder portion. The steering wheel according to claim 1 or 2 , wherein the spoke metal core part is configured as only two extending from the boss metal core part on both sides in the left-right direction. As the two-layer structure in which the covering layer is made of a foam material together with an inner layer that covers the core metal and an outer layer that covers the surface of the inner layer, including the inner layer that extends to the extended covering portion,
The inner layer is from the outer layer, low density, and a steering wheel according to any one of claims 1 or claims to claim 3, characterized in that it is formed by increasing the rigidity. Steering wheel
As a configuration comprising a ring part to be gripped at the time of steering, a boss part arranged at the center of the ring part, and a spoke part connecting the boss part and the ring part,
While comprising a metal cored bar that interconnects the ring part, the boss part, and the spoke part,
A ring cored bar portion disposed in the ring portion of the cored bar, a bossed cored bar portion disposed in the bossed portion, and a spoke cored bar portion disposed in the spoke portion;
The ring core metal part and the spoke core metal part in the vicinity of the ring core metal part, a synthetic resin coating layer formed by molding, the ring coating covering the ring core metal part A coating layer comprising a portion and a spoke covering portion that covers the spoke core portion,
The spoke part is
A genuine spoke part provided with the spoke core metal part to be covered with the spoke covering part;
A pseudo spoke portion formed by using an extended covering portion extending from the ring covering portion without disposing the spoke core portion connecting the ring core portion and the boss core portion. When,
As two types of
In manufacturing a plurality of steering wheels in which the genuine spoke part and the pseudo spoke part are appropriately arranged, the core bar is shared,
A cavity part where the ring covering part and the spoke covering part can be formed at the time of forming the covering layer at the time of manufacturing the steering wheel provided with the extending covering part, and a cavity where the extending covering part can be formed And using a mold provided with a part,
Producing using a mold provided with a cavity part capable of forming the ring covering portion and the spoke covering portion at the time of forming the covering layer at the time of manufacturing the steering wheel in which the extended covering portion is not disposed. A method for manufacturing a steering wheel. As a steering wheel manufactured using the core metal in common, a basic steering wheel including only the genuine spoke portion and a modified steering wheel including at least one pseudo spoke portion in addition to the genuine spoke portion are manufactured. Hits the,
The basic molding die for molding the coating layer of the basic steering wheel and the deformation molding die for molding the coating layer of the modified steering wheel share the main body, corresponding to the difference in the shape of the coating layer to be molded. The method for manufacturing a steering wheel according to claim 5 , comprising a mold surface and a nesting that is replaceably mounted on the main body. 7. The method for manufacturing a steering wheel according to claim 5 , wherein the spoke core metal part is configured as only two extending from the boss core metal part on both sides in the left-right direction. 8. As the two-layer structure in which the covering layer is made of a foam material together with an inner layer that covers the core metal and an outer layer that covers the surface of the inner layer, including the inner layer that extends to the extended covering portion,
The method for manufacturing a steering wheel according to any one of claims 5 to 7 , wherein the inner layer is formed with lower density and higher rigidity than the outer layer.

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