WO2013187286A1

WO2013187286A1 - Steering wheel and steering wheel production method

Info

Publication number: WO2013187286A1
Application number: PCT/JP2013/065504
Authority: WO
Inventors: 英孝東; 暢彦吉井; 景太山内
Original assignee: 芦森工業株式会社
Priority date: 2012-06-13
Filing date: 2013-06-04
Publication date: 2013-12-19
Also published as: JP2013256236A; JP5979995B2

Abstract

A steering wheel production method in which damage to the external appearance of a steering wheel is prevented during production of a steering wheel comprising a coated section and a core bar-exposed section. The steering wheel (1) comprises: a core bar (10) having a step section (13); the coated section (20); and the exposed section (6). The coated section (20) comprises a coating material coating the core bar (10). The core bar (10) is exposed in the exposed section (6), without the core bar (10) being coated by the coating material. The step section (13) is formed along an edge section (23) of the coated section (20) adjacent to the exposed section (6), and from a floor surface (14) positioned on the edge section (23) side of the coated section (20) to the surface (6A) of the exposed section (6). An unnecessary section (25) that occurs in the edge section (23) of the coated section (20) during coating of the core bar (10) is cut off further on the coated section (20) side than the step section (13), and removed from the coated section (20).

Description

Steering wheel and method for manufacturing steering wheel

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

In addition to its function, the appearance of the steering wheel for vehicles placed in front of the driver's seat is regarded as important. The surface of the steering wheel is generally composed of an outer member that covers the core metal, and the core metal is provided inside the steering wheel. When the steering wheel is manufactured by covering with a covering material (for example, a resin material), the core is formed by covering the core with the covering material, and the core is covered with a covering portion made of the covering material. On the other hand, conventionally, a steering wheel that maintains a light appearance by exposing a part of a core metal of a spoke is known (see Patent Document 1).

When manufacturing a steering wheel provided with the exposed portion of the core metal by coating the covering material, the covering portion and the exposed portion are provided on the steering wheel by covering the covering material with a part of the core metal. In that case, an unnecessary part (burr etc.) which consists of covering materials may arise in the edge of the covering part adjacent to an exposed part.

FIG. 11 is a cross-sectional view showing the manufacturing procedure of the conventional steering wheel 100, and shows the vicinity of the boundary between the covering portion 101 and the exposed portion 102. FIG. That is, FIG. 11A is a diagram showing the cored bar 103 when coating the coating material, FIG. 11B is a diagram showing the cored bar 103 coated with the coating material, and FIG. 11C is an enlarged view of the portion X in FIG.
At the time of manufacturing the steering wheel 100, the core metal 103 (see FIG. 11A) is disposed between the pair of

molds

110 and 111, and the

molds

110 and 111 are combined. At that time, the exposed portion 102 of the core metal 103 is sandwiched between the

molds

110 and 111, and a space 112 filled with the coating material is formed in a part of the

molds

110 and 111 and the core metal 103 (portion for forming the coating portion 101). Form between.

Subsequently, the coating material is filled in the space 112, and in the space 112, the coating material is molded while covering the core metal 103. Thus, a covering portion 101 (see FIG. 11B) made of a covering material is formed on the steering wheel 100. Thereafter, the

molds

110 and 111 are released, and the steering wheel 100 is taken out of the

molds

110 and 111. However, when the covering material is covered, the covering material enters between the

molds

110 and 111 and the exposed portion 102, and an unnecessary portion (here, burr) 104 (see FIG. 11C) is generated at the edge of the covering portion 101. Sometimes.

The unnecessary portion 104 needs to be removed from the edge of the covering portion 101 by a cutter or the like in order to maintain the appearance of the steering wheel 100. However, as the unnecessary portion 104 is cut off, the exposed portion 102 may be damaged and the appearance of the steering wheel 100 may be impaired. In addition, the unnecessary portion 104 needs to be cut along the edge portion so as not to deviate from the edge portion of the covering portion 101 and reliably removed from the edge portion. For this reason, the removal of the unnecessary portion 104 requires troublesome work, and the labor and time of the work increase.

Japanese Patent Application Laid-Open No. 10-119791

The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to produce an unnecessary portion at the edge of the covering portion adjacent to the exposed portion when the steering wheel including the covering portion and the exposed portion of the metal core is manufactured. Is easily removed and the appearance of the steering wheel is prevented from being damaged.

The present invention is a steering wheel including a cored bar, a coating part made of a coating material coated on the cored bar, and an exposed part where the cored bar is exposed without being covered with the coating material, the cored bar being an exposed part A step portion formed from the bottom surface located on the edge side of the covering portion to the surface of the exposed portion along the edge portion of the covering portion adjacent to the edge portion of the covering portion, and the edge portion of the covering portion when covering the metal core The steering wheel in which the unnecessary part which arises in this is cut off by the coating | coated part side rather than a step part and removed from a coating | coated part.
Further, the present invention is a method for manufacturing a steering wheel comprising a cored bar, a coating part made of a coating material coated on the cored bar, and an exposed part where the cored bar is exposed without being coated with the coating material, A covering step of covering the core metal with a covering material while exposing the portion, and forming an edge of the covering portion adjacent to the exposed portion on the bottom surface side of the step portion along the step portion provided on the core metal; And a removing step of removing an unnecessary portion generated at the edge portion of the portion from the covering portion by cutting the covering portion closer to the covering portion than the stepped portion.

According to the present invention, it is possible to easily remove unnecessary portions generated at the edge portion of the covering portion adjacent to the exposed portion when the steering wheel including the covering portion and the exposed portion of the cored bar is manufactured. Further, it is possible to prevent the appearance of the steering wheel from being damaged.

It is a perspective view of the steering wheel of a 1st embodiment. It is a perspective view which shows the internal structure of the steering wheel shown in FIG. It is a figure which expands and shows the spoke part of a steering wheel. It is sectional drawing which shows the formation procedure of the coating | coated part of 1st Embodiment. It is sectional drawing which shows the spoke coating | coated part which removed the unnecessary part. It is a front view of the steering wheel of a 2nd embodiment. It is sectional drawing which shows the manufacture procedure of the steering wheel of 3rd Embodiment. It is sectional drawing which shows the spoke coating | coated part which removed the unnecessary part. It is sectional drawing which shows the manufacture procedure of the steering wheel of 4th Embodiment. It is sectional drawing which shows the spoke coating | coated part which removed the unnecessary part. It is sectional drawing which shows the manufacturing procedure of the conventional steering wheel.

An embodiment of a steering wheel and a method for manufacturing a steering wheel according to the present invention will be described with reference to the drawings.
The steering wheel of this embodiment is a steering member for a vehicle, and is disposed in front of the driver's seat and used for steering the vehicle. Moreover, this steering wheel is manufactured by coating | covering a coating material similarly to the conventional steering wheel.

(First embodiment)
FIG. 1 is a perspective view of a steering wheel 1 according to the first embodiment, and shows the steering wheel 1 as viewed from the vehicle occupant side. FIG. 2 is a perspective view showing an internal structure of the steering wheel 1 shown in FIG.
As shown in the figure, the steering wheel 1 includes a metal boss 2, a cover 3 provided at the center, an annular rim 4, and three spokes 5. Further, the steering wheel 1 includes a cored bar 10, a covering part 20 provided on a part of the cored bar 10, and an exposed part 6 made up of a part of the cored bar 10.

The boss 2 is disposed inside the rim 4 and is connected to a steering shaft (not shown). The cover 3 is formed in a bowl shape with resin, and is attached to the steering wheel 1 so as to cover the boss portion 2. The rim portion 4 is a grip that is gripped by an occupant when the steering wheel 1 is operated, and surrounds the boss portion 2. The spoke portion 5 is provided between the boss portion 2 and the rim portion 4 and is fixed to the boss portion 2 and the rim portion 4. The boss part 2 and the rim part 4 are connected by three spoke parts 5 arranged radially.

The metal core 10 is a metal skeleton member of the steering wheel 1 and includes an annular rim metal core 11 and three plate-shaped spoke metal cores 12. The rim core metal 11 is provided on the rim portion 4 and surrounds the boss portion 2. The spoke mandrel 12 is provided in the spoke part 5 and connects the boss part 2 and the rim mandrel 11. The core metal 10 is integrally formed by casting a metal (for example, an aluminum alloy or a magnesium alloy), or is formed by joining the rim core metal 11 and the spoke core metal 12.

The covering portion 20 is made of a covering material covered on the core metal 10 and has an annular rim covering portion 21 and three spoke covering portions 22. The rim covering portion 21 is made of a covering material for the rim portion 4 covered on the rim core metal 11. The spoke covering portion 22 is made of a covering material for the spoke portion 5 covered on the spoke core metal 12. Here, the covering material is a moldable resin material, and is formed into a predetermined shape while being covered on a part of the surface of the core metal 10. The rim covering portion 21 and the spoke covering portion 22 are integrally formed by a mold and enclose the rim core metal 11 and the spoke core metal 12.

In the exposed portion 6, a part of the core metal 10 is exposed without covering a part of the core metal 10 with the covering material. The exposed portion 6 is provided at a portion of the steering wheel 1 that can be seen by the passenger, and is exposed as a design on the surface of the steering wheel 1. Here, a part of the three spoke core bars 12 is not covered with the covering material, but a part thereof is exposed. Moreover, the spoke coating | coated part 22 is formed in the part by the side of the rim core metal 11 of the spoke metal core 12, and the part by the side of the boss | hub part 2 of the spoke metal core 12 is exposed. That is, the surface of the spoke part 5 is composed of the spoke covering part 22 on the rim part 4 side and the exposed part 6 on the boss part 2 side.

The exposed portion 6 is composed of a part of the spoke core 12 and is provided between the spoke covering portion 22 and the cover 3. The cored bar 10 (spoke cored bar 12) has a stepped part 13 between the spoke covering part 22 and the exposed part 6. The spoke covering portion 22 is formed in the vicinity along the step portion 13 of each spoke portion 5.

FIG. 3 is an enlarged view showing the spoke portion 5 of the steering wheel 1. 3A is a front view of the spoke portion 5, and FIG. 3B is an enlarged side view schematically showing the spoke portion 5 as viewed from the Y direction in FIG. 3A.
As shown in the drawing, the edge portion 23 of the covering portion 20 (spoke covering portion 22) is disposed along the step portion 13 of the exposed portion 6 with a predetermined interval therebetween, and between the step portion 13. Are formed with recesses (grooves) 7.

The bottom of the concave portion 7 is a bottom portion 31 of the groove portion 30 formed in the spoke core metal 12, and is disposed along the edge portion 23 of the spoke covering portion 22. The step portion 13 is composed of one step formed from the bottom portion 31 located on the edge 23 side to the surface 6A of the exposed portion 6, and is formed so as to protrude from the bottom portion 31.
The edge portion 23 of the spoke covering portion 22 is located in the concave portion 7 constituted by the groove portion 30 and is in contact with the bottom portion 31 of the groove portion 30 following the step portion 13 or the wall portion 33 of the groove portion 30.

As described above, when an unnecessary portion is generated on the edge 23 of the spoke covering portion 22 when the covering material is coated on the core metal 10, the unnecessary portion is not cut off on the exposed portion 6 side of the step portion 13, and the step portion 13 at the bottom 31 side. That is, the unnecessary portion 25 is not cut off at the surface 6 A of the exposed portion 6, but is cut along the stepped portion 13 at a position on the bottom 31 side of the stepped portion 13. Thereby, when the unnecessary portion 25 is cut off at a position close to the step portion 13 and removed from the edge portion 23, the step portion 13 is exposed. At the same time, the concave portion 7 appears along the step portion 13 between the spoke covering portion 22 and the exposed portion 6. Here, as will be described later, the stepped portion 13 is formed by a part of the groove portion 30 formed at the boundary between the spoke covering portion 22 and the exposed portion 6 (see FIG. 2).

Next, the manufacturing procedure of the steering wheel 1 will be described.
First, the core metal 10 is produced, and surface treatment (painting, plating, etc.) is performed on the core metal 10. Subsequently, the covering portion 20 is formed on the core metal 10 by injection molding using a mold.
FIG. 4 is a cross-sectional view showing a procedure for forming the covering portion 20 of the first embodiment, and shows the vicinity of the boundary between the covering portion 22 and the exposed portion 6. 4A is a diagram showing the cored bar 10 when coating the coating material, FIG. 4B is a diagram showing the cored bar 10 coated with the coating material, and FIG. 4C is an enlarged view of the portion X in FIG. 4B.

The cored bar 10 has a groove 30 provided in the spoked cored bar 12 as shown. The groove portion 30 is formed along the edge portion 23 of the spoke covering portion 22 and from a position inside the spoke covering portion 22 (edge portion 23) to a position outside the spoke covering portion 22. The position inside the spoke covering portion 22 is a position covered by the spoke covering portion 22, and the position outside the spoke covering portion 22 is a position on the exposed portion 6 side that is not covered by the spoke covering portion 22. The groove part 30 is provided in the position where the edge part 23 is formed so that it may be located inside and outside of the edge part 23 of the spoke covering part 22. Moreover, the groove part 30 (refer FIG. 4C) has the bottom part 31 and a pair of

wall parts

32 and 33, and a pair of

wall parts

32 and 33 oppose on both sides of the bottom part 31. FIG. The step portion 13 of the core metal 10 includes a wall portion 32 on the exposed portion 6 side of the groove portion 30, and the bottom surface of the step portion 13 of the core metal 10 includes a bottom portion 31 of the groove portion 30.

Before covering the covering material, the pair of

molds

40, 41 provided in the injection molding machine (not shown) is separated, and the core metal 10 is placed between the molds 40, 41 (see FIG. 4A). Subsequently, the

molds

40 and 41 are combined and closely attached to the core metal 10, and the exposed portion 6 of the core metal 10 is sandwiched between the

molds

40 and 41. At the same time, a space 42 filled with the coating material is formed between the

molds

40 and 41 and a part of the core metal 10 (portion for forming the coating part 20). The

molds

40 and 41 are arranged from the exposed part 6 to the part where the groove part 30 of the core metal 10 is formed so as to cover a part of the groove part 30 on the exposed part 6 side.

In this state, the softened coating material is injected into the space 42 and filled into the space 42 by an injection molding machine, and the coating material is molded in the space 42. As a result, the core metal 10 is covered with the coating material while exposing the exposed portion 6, and the coating material is cured. Thereafter, the

molds

40 and 41 are released, and the core metal 10 is taken out from the molds 40 and 41 (see FIG. 4B).

A covering portion 20 made of a covering material is formed on the cored bar 10 by covering with the covering material. At that time, the covering material is covered on the entire rim core metal 11, and the rim covering portion 21 is formed on the entire rim core metal 11. At the same time, the covering material is covered on a part of the spoke core metal 12, and the spoke covering portion 22 is formed on a part of the spoke core metal 12. The spoke portion 5 is provided with a spoke covering portion 22 and an exposed portion 6. In the step portion 13 (see FIG. 4C) provided on the core metal 10, the edge portion 23 of the spoke covering portion 22 is formed on the bottom portion 31 side along the step portion 13 by covering with the covering material. Here, the edge portion 23 is formed along the groove portion 30 in the portion (area) where the groove portion 30 of the core metal 10 is formed, and the edge portion 23 is near the step portion 13 and the groove portion 30. Formed in the area.

Further, when the coating material is coated on the cored bar 10, the coating material enters the groove 30 and fills the groove 30, or the coating material fills the groove 30 and overflows from the groove 30. When this covering material enters between the

molds

40, 41 and the exposed portion 6, a burr 24 is generated at the edge 23. In this way, an extra portion (unnecessary portion 25) made of a coating material is generated at the edge portion 23 of the covering portion 20 (spoke covering portion 22). The unnecessary portion 25 is a portion unnecessary for the spoke covering portion 22, and includes an extra portion of the edge portion 23 (burr 24, a covering material in the groove portion 30 protruding from the edge portion 23, etc.).

The unnecessary portion 25 generated at the edge 23 of the spoke covering portion 22 is cut by the cutting means (cutter, knife, etc.) (not shown) and cut off from the edge 23. At the time of cutting, the unnecessary portion 25 is cut off on the bottom 31 side of the step portion 13 and removed from the edge portion 23 of the spoke covering portion 22 so that the surface 6A of the exposed portion 6 is not damaged by the cutting means. That is, here, the unnecessary portion 25 of the spoke covering portion 22 is cut toward the groove portion 30 of the core metal 10 and cut along the groove portion 30 in the groove portion 30. Thereby, the edge part 23 of the spoke coating | coated part 22 is formed in a predetermined shape.

FIG. 5 is a cross-sectional view showing the spoke covering portion 22 from which the unnecessary portion 25 is removed, and the edge portion 23 of the spoke covering portion 22 is shown by a view corresponding to FIG. 4C.
When the unnecessary portion 25 is removed, as shown in FIG. 5A, the unnecessary portion 25 is cut off along the longitudinal direction of the groove portion 30 at the bottom portion 31 and removed from the spoke covering portion 22 and the cored bar 10. On the other hand, as shown in FIG. 5B, the unnecessary portion 25 is cut toward the wall portion 33 on the side of the spoke covering portion 22 that faces the wall portion 32 on the exposed portion 6 side of the groove portion 30. You may make it cut out. The unnecessary portion 25 is a wall portion 33 that is cut out along the longitudinal direction of the groove portion 30 and is removed from the spoke covering portion 22 and the cored bar 10 so that a part of the groove portion 30 and the step portion 13 are exposed. Further, the edge of the surface 6 A of the exposed portion is exposed, and the recess 7 appears along the stepped portion 13.

Thereafter (see FIGS. 1 and 2), the boss 2 is fixed to the core 10 and the cover 3 and the like are attached to the core 10 and the boss 2. Moreover, an airbag apparatus is mounted on the steering wheel 1 as necessary. Thereby, manufacture of the steering wheel 1 provided with the metal core 10, the coating | coated part 20, and the exposure part 6 is completed.

As described above, when the unnecessary portion 25 is generated at the edge portion 23 of the spoke covering portion 22, the unnecessary portion 25 is cut off on the bottom 31 side of the groove portion 30 (that is, in the groove portion 30). Therefore, it is possible to prevent the exposed portion 6 from being damaged as the unnecessary portion 25 is cut off. Further, since the cut-off scratch is attached to the groove portion 30, it is difficult to see from the occupant and does not stand out. Therefore, it is possible to prevent the appearance of the steering wheel 1 from being damaged and maintain a good appearance. When the unnecessary portion 25 is cut off by the wall portion 33 of the groove portion 30, the scratch is formed on the inconspicuous wall portion 33 and hidden by the spoke covering portion 22. As a result, it is possible to more reliably prevent the appearance of the steering wheel 1 from being damaged.

When the unnecessary portion 25 is cut off, the step portion 13 or the groove portion 30 constituting the step portion 13 serves as a guide, so that the unnecessary portion 25 can be cut out easily and accurately. Moreover, the unnecessary part 25 can be smoothly cut off at a position away from the exposed part 6. Therefore, the unnecessary portion 25 can be easily removed, and the labor and time of work can be reduced.

The step portion 13 and the groove portion 30 may be formed along the entire edge portion 23 of the spoke covering portion 22 or may be formed along a part of the edge portion 23. When the step portion 13 and the groove portion 30 are formed along a part of the portion that becomes the edge portion 23, the step portion 13 and the groove portion 30 are formed at least on the occupant side portion of the core metal 10. Thereby, since the step part 13 and the groove part 30 decrease, the intensity | strength of the metal core 10 can be made high, maintaining the external appearance of the steering wheel 1. FIG. By forming the step portion 13 and the groove portion 30 only in the occupant side portion of the core metal 10, the strength of the core metal 10 can be further increased.

The wall portions 32 and 33 (see FIG. 4C) of the groove portion 30 may be formed at the same height or at different heights with respect to the bottom portion 31. When the

wall portions

32 and 33 are formed at different heights, the wall portion 32 on the exposed portion 6 side may be raised, and the wall portion 33 on the spoke covering portion 22 side may be raised. Here, the surface 22 A (see FIG. 4B) of the spoke covering portion 22 is formed at a position farther from the bottom portion 31 than the surface 6 A of the exposed portion 6. On the other hand, you may make the surface 22A of the spoke coating | coated part 22 approach the bottom part 31 (surface 6A of the exposed part 6) by changing the thickness of the spoke coating | coated part 22. FIG. The wall portion 33 on the spoke covering portion 22 side may be made lower than the wall portion 32 on the exposed portion 6 side, and the surface 22A of the spoke covering portion 22 may be formed at a position corresponding to the surface 6A of the exposed portion 6. Moreover, you may change the positional relationship of

surface

6A, 22A by changing the height of the wall part 32 at the exposed part 6 side.

Next, another embodiment of the steering wheel 1 that is partially different from the first embodiment will be described.
The second to fourth embodiments described below are basically the same as the first embodiment, and exhibit the same effects as the first embodiment. Therefore, in the following, matters different from those already described will be described, and description of the same items as those already described will be omitted.

(Second Embodiment)
FIG. 6 is a front view of the steering wheel 1 of the second embodiment, and shows a part of the spoke part 5 and the rim part 4.
In this steering wheel 1, the surface 6A of the exposed portion 6 is a hairline processed surface 6B as shown in the drawing. The hairline process is a process for forming a large number of fine lines (hairlines) arranged in parallel, and is applied to the surface 6A of the exposed portion 6. The hairline of the hairline processed surface 6B is composed of a line in a direction along the step portion 13 (the groove portion 30 and the edge portion 23 of the spoke covering portion 22) of the core metal 10, and is formed on the entire surface 6A in parallel with the step portion 13. ing. At the time of manufacturing the steering wheel 1, hairline processing in the direction along the step portion 13 is applied to the surface 6A of the exposed portion 6 before the covering material is covered. Thereby, the damage | wound accompanying cutting off of the unnecessary part 25 can be made inconspicuous.

(Third embodiment)
FIG. 7 is a cross-sectional view showing the manufacturing procedure of the steering wheel 1 of the third embodiment. 7A to 7C correspond to FIGS. 4A to 4C, respectively.
The molds 40 and 41 (see FIG. 7A) have convex portions (ridges) 40A and 41A formed along the groove portion 30. When the metal core 10 is accommodated in the

molds

40 and 41, the convex portions 40 A and 41 A are inserted into the groove portions 30. A part of the groove part 30 on the exposed part 6 side is filled with

convex parts

40A and 41A. At the edge portion 23 (see FIGS. 7B and 7C) of the spoke covering portion 22, the covering material enters a part of the groove portion 30, and an unnecessary portion 25 including the burr 24 is generated in the groove portion 30.

FIG. 8 is a cross-sectional view showing the spoke covering portion 22 from which the unnecessary portion 25 is removed, and the edge portion 23 of the spoke covering portion 22 is shown by a view corresponding to FIG. 7C.
The unnecessary portion 25 is removed from the spoke covering portion 22 by being cut out in the groove portion 30 of the core metal 10 as shown in the figure. At that time, the unnecessary portion 25 is cut off at the bottom portion 31 (see FIG. 8A) of the groove portion 30 or at the wall portion 33 (see FIG. 8B) of the groove portion 30 on the spoke covering portion 22 side.

(Fourth embodiment)
FIG. 9 is a cross-sectional view showing the manufacturing procedure of the steering wheel 1 of the fourth embodiment. 9A to 9C are diagrams corresponding to FIGS. 4A to 4C, respectively.
In the steering wheel 1, the cored bar 10 is different from that of the first embodiment (see FIG. 4) as illustrated. That is, the cored bar 10 does not have the groove 30, and the bottom surface 14 whose vertical dimension in the drawing is smaller than that of the exposed part 6 of the cored bar 10 is formed on the entire portion covered with the coating material. The step portion 13 is composed of one step between the bottom surface 14 and the surface 6 A of the exposed portion 6. The unnecessary portion 25 is generated at the edge portion 23 of the spoke covering portion 22 as in the first embodiment.

FIG. 10 is a cross-sectional view showing the spoke covering portion 22 from which the unnecessary portion 25 has been removed, and the edge portion 23 of the spoke covering portion 22 is shown by a view corresponding to FIG. 9C.
The unnecessary portion 25 is removed from the spoke covering portion 22 by being cut off on the bottom surface 14 side of the step portion 13 as shown in the figure. At that time, the unnecessary portion 25 is cut toward the bottom surface 14 and cut off at the bottom surface 14. Moreover, the unnecessary part 25 is cut off according to the surface of the edge part 23 (refer FIG. 10A) or toward the inner side of the edge part 23 (refer FIG. 10B).

Although the example in which the exposed portion 6 is provided in the spoke portion 5 has been described above, the exposed portion 6 may be provided in a portion other than the spoke portion 5 of the steering wheel 1. For example, when the exposed portion 6 is provided on the rim portion 4, the covering material is covered on a part of the rim core metal 11, and the rim covering portion 21 is formed on a part of the rim core metal 11. Further, the exposed portion 6 where the rim core metal 11 is exposed is provided in the rim portion 4 without covering the other part of the rim core metal 11 with the covering material. When the unnecessary portion 25 is generated at the edge portion 23 of the rim covering portion 21 adjacent to the exposed portion 6, the unnecessary portion 25 is cut off from the rim covering portion 21 in the same manner as described above. In this manner, the covering portion 20 and the exposed portion 6 of the core metal 10 are provided on the steering wheel 1, and the unnecessary portion 25 generated at the edge portion 23 of the covering portion 20 is removed from the covering portion 20.

DESCRIPTION OF SYMBOLS 1 ... Steering wheel, 2 ... Boss part, 3 ... Cover, 4 ... Rim part, 5 ... Spoke part, 6 ... Exposed part, 6A ... Surface, 6B ... · Hairline processing surface, 7 ··· recess, 10 ··· cored bar, 11 ··· rim cored bar, 12 · · · spoke cored bar, 13 ··· stepped portion, 14 · · · bottom surface, 20 ··· -Cover part, 21 ... Rim cover part, 22 ... Spoke cover part, 23 ... Edge part, 24 ... Burr, 25 ... Unnecessary part, 30 ... Groove part, 31 ... Bottom part, 32 ... wall part, 33 ... wall part, 40 ... mold, 40A ... convex part, 41 ... mold, 41A ... convex part, 42 ... space.

Claims

A steering wheel comprising a cored bar, a coating part made of a coating material coated on the cored bar, and an exposed part where the cored bar is exposed without being coated with the coating material,
The metal core has a step portion formed along the edge of the covering portion adjacent to the exposed portion and from the bottom surface located on the edge side of the covering portion to the surface of the exposed portion,
A steering wheel in which an unnecessary portion generated at an edge portion of a covering portion at the time of covering a metal core is cut off on the covering portion side from a step portion and removed from the covering portion.
The steering wheel according to claim 1,
The cored bar has a groove formed along the edge of the covering part and from a position in the covering part to a position outside the covering part;
A steering wheel in which a step portion of a core bar includes a step portion including a wall portion on the exposed portion side of the groove portion.
The steering wheel according to claim 2,
A steering wheel in which an unnecessary portion of the covering portion is cut off in the groove portion of the cored bar and removed from the covering portion.
The steering wheel according to claim 3,
A steering wheel in which an unnecessary portion of the covering portion is cut off at a bottom portion of the groove portion or a wall portion on the covering portion side facing a wall portion on the exposed portion side of the groove portion.
The steering wheel according to any one of claims 1 to 4,
Steering wheel with hairline processing in the direction along the step on the surface of the exposed part.
A method of manufacturing a steering wheel comprising a cored bar, a coating part made of a coating material coated on the cored bar, and an exposed part where the cored bar is exposed without being coated with the coating material,
A covering step of covering the core metal with the covering material while exposing the exposed portion, and forming the edge of the covering portion adjacent to the exposed portion on the bottom surface side of the step portion along the step portion provided on the core metal;
A removal step of removing unnecessary portions generated at the edge of the covering portion from the covering portion by cutting off the covering portion side of the stepped portion,
A method of manufacturing a steering wheel having
In the manufacturing method of the steering wheel according to claim 6,
A method for manufacturing a steering wheel, wherein a step portion of a cored bar includes a step portion including a wall portion on the exposed portion side of a groove portion.
In the manufacturing method of the steering wheel according to claim 7,
The covering step has a step of forming the edge of the covering portion along the groove portion in the portion where the groove portion of the core metal is formed;
A method for manufacturing a steering wheel, wherein the removing step includes a step of removing an unnecessary portion of the covering portion from the covering portion by cutting out the inside of the groove portion of the cored bar.
In the manufacturing method of the steering wheel according to claim 8,
A method for manufacturing a steering wheel, wherein the removing step includes a step of cutting an unnecessary portion of the covering portion at a bottom portion of the groove portion or a wall portion on the covering portion side facing the wall portion on the exposed portion side of the groove portion.
In the manufacturing method of the steering wheel according to any one of claims 6 to 9,
The manufacturing method of a steering wheel which has the process of giving the hairline process of the direction in alignment with a step part to the surface of an exposed part.