JPS59202833A - Manufacture of steering wheel - Google Patents

Abstract

PURPOSE:To contrive to achieve the lightening of a wheel and the cost reducing at manufacture by injection molding synthetic resin so as to cover the outer periphery of a ring, while setting the core metal for a steering wheel in molds and pressurizing the hollow inner part of the ring by oil pressure. CONSTITUTION:A core metal 1 is set in a stationary mold 12 and a movable mold 16, and inlet and outlet nozzles 17 for pouring are connected to the flowing through holes 18 of the core metal 1. Next, oil L is poured into a ring part 9 and spoke parts 7 from said inlet and outlet nozzle 17. While pressurizing said inner parts 9 and 7 by oil pressure, synthetic resin such as polypropylene resin, etc. is injected into the cavity through a sprue 15 and a runner 14 from a nozzle 11 and covers the outer periphery of the ring part 9, the spoke parts 7 and a spoke holding member 10. Then, the oil L in the ring part 9 and the spoke parts 7 is removed from the inlet and outlet nozzle 17. Accordingly, even if the ring part 9 and the spoke parts 7 have thin walls, they are not deformed by the injecting pressure at injection molding.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field This invention relates to a method of manufacturing a steering wheel.

Prior Art Conventionally, there is a steering wheel that aims to reduce weight by using a steering wheel guard with a hollow ring part, but the wall thickness of the ring part is quite thick, for example, in the case of steel, it is around +6 m7. Met.

However, if this ring part is further made with Mn, there is a risk that the ring part will be crushed by the injection pressure when the outer periphery is coated with a synthetic resin such as vorapropylene resin, polysalt (B vinyl resin, etc.) by injection molding. Therefore, it has been difficult to achieve such a thin wall thickness.

Purpose An object of the present invention is to prevent the ring from deforming due to injection pressure when the outer periphery of the ring of the mandrel is coated with synthetic resin such as polypropylene resin or polyhinyl chloride resin by injection molding. It is an object of the present invention to provide a novel method for manufacturing a steering wheel, which makes it possible to reduce the wall thickness of the steering wheel, thereby reducing the weight and cost of the steering wheel.

EXAMPLE Hereinafter, an example embodying the present invention will be described with reference to FIGS. 1 to 5. In the drawings, reference numeral 1 indicates the entire steering wheel mandrel. Reference numeral 2 denotes a phosphor plate made of a metal plate with a core 1, and a boss 3 protruding toward the back side is provided in the center of the plate.
The boss 3 is provided with a tapered hole 4 into which a steering shaft (not shown) is inserted.5
is a curved cutout on both sides of boss play 1 and 2.
The mounting portions are U-shaped, and a through hole 6 is provided on the back side of both mounting portions 5.

1 is 218 which is sandwiched within the attachment part 5 at the proximal end.
A hollow vibrator made of steel or the like with a wall thickness of 0.4 to 1.6 mm is used for the spoke portion. The base end of the spoke part 7 is curved into the through hole 6 and becomes an oil flow hole 8 which is opened on the back side of the boss plate 2 (τ), and the opening end is enlarged in diameter by caulking.9 10 is a song part made of a hollow vibrator continuously formed from the tips of both spoke parts 7, and both communication holes 8 are connected by spoke part 1 and ring part 9. It is a rod-shaped spoke support member that is hung at the tip.

11 is a nozzle of an injection molding machine (the whole is not shown). 12 is a fixed type, and a core metal 1 is installed on a cavity surface 12a, and a cavity 1 is filled with synthetic resin.
3 and runner 14. A sub-relay 15 is provided in a recessed manner.

Reference numeral 16 is a movable type in which a cavity is similarly recessed in the cavity surface, and an oil injection nozzle 17 connected to the flow hole 8 of the mandrel 1 is inserted from the opposite surface. .

Reference numeral 18 denotes a hydraulic hose attached to the base end of the inlet/outlet nozzle 170, and is connected to a hydraulic pump (not shown).

Next, in order to use this embodiment, first, the mandrel 1 is installed in the fully fixed mold 12 and the movable mold 16, and the pouring nozzle 11 is connected to the flow hole 8 of the mandrel 1. Next, oil is injected into the ring part 9 and the spoke part 7 from the injection/input nozzle 11, and while pressurizing the same circle with hydraulic pressure, the sprue 15 is poured from the IJiWt nozzle 11 for synthetic packing such as polypropylene resin.
．． The synthetic resin is injected into the cavity 13 through the runner 14, and the outer circumferences of the ring portion 9, spoke portions 7, and spoke support member 10 are coated with the same synthetic resin. Thereafter, the oil in the ring portion 9 and the spoke portions 1 may be removed from the pouring/input nozzle 11.

As described above, in this embodiment, even though the ring portion 9 and the spoke portion γ have thin walls, the inside thereof is pressurized by hydraulic pressure, so that they do not form into a diamond shape due to the injection pressure during injection molding.

Next, another example of the above embodiment will be explained with reference to FIG.
In this other example, the ring part 9 is formed into an independent ring shape by a hollow vibrator made of eyebrows etc. with a wall thickness of 0.4 to 1.6, and plate-shaped spokes 19 are adhered to the ring part 9. It is different from the previous embodiment in that it is attached by welding or the like, and two oil flow holes 8 are provided on the back side of the upper part of the ring part 9. The method and effect are similar.

Furthermore, according to this alternative example, the ring portion is commonly prepared for various types of steering wheels, and only other parts are prepared, for example, in one
It has the advantage of being able to be configured by changing it, such as making it a real spoke.

In this other example, since the true plate portion of the song portion 9 is a portion to which little external force is applied, the low strength of the portion directly above due to the communication hole 8 does not pose a problem.

Effects As described in detail above, the present invention provides a steering wheel guard 1 having a hollow ring portion 9 in a position type 12.
, 16, and the hollow inside of the same ring part 9 is filled with oil LlfV.
C. Therefore, while applying pressure, injection mold the synthetic resin so as to cover at least one outer circumference of the ring part 9, and then release the pressure inside the ring part 9 and remove the bending, so that the ring part is injected. Since there is no risk of deformation due to pressure, it is possible to reduce the wall thickness of the ring portion, which has an excellent effect of making the steering wheel lighter and more compact.

[Brief explanation of the drawing]

FIG. 1 is a front view of a steering guard in an embodiment embodying the present invention, FIG. 2 is a rear view of the same, and FIG. 6 is an enlarged sectional view taken along line A-A in FIG. FIG. 4 is an enlarged sectional view taken along the line 13-B in FIG. 1, FIG. 5 is an exploded perspective view showing the usage state of this embodiment, and FIG. It is a front view of gold. Mandrel 1, ring part 9, fixed mold 12, movable mold 16, tear] L
0 Patent applicant Toyoda Gosei Co., Ltd. agent
Patent Attorney Hironobu Onda□□1) 2 Figure 1″O Figure 4

Claims (1)

[Claims] 1. A steering wheel mandrel (1) having a hollow ring part (9) is installed in a mold (12, 16), and the hollow inside of the ring part (9) is filled with oil (L). ) While applying pressure, injection mold a synthetic resin so as to cover at least the outer periphery of the ring part (9), then release the oil (L) pressure inside the ring part (9) and remove the same piece (L). A method for manufacturing a steering wheel, characterized by: 2. A ring portion (9) and spoke portions (7) that support the ring portion.
Manufacturing a steering wheel according to claim 1, characterized in that the spoke parts (7) are continuously formed in a hollow manner, and oil (L) pressure is applied through the communication holes (8) provided at the base ends of the spoke parts (7). Method. 3971 part (9) The method for manufacturing a steering wheel according to claim 1, characterized in that oil (I.) pressure is applied from a flow hole (8) provided directly above.