JPS5957066A - Manufacturing method of car handle - Google Patents

Abstract

PURPOSE:To improve the precision by arranging parts of a boss and a ring in a mold to mold a boss plate and spokes and inserting nonferrous metal to mold the boss and the ring inclusively for molding the boss plate and spokes. CONSTITUTION:A metallic boss 11 and a ring 10 of a metallic tube are respectively arranged at fixed positions in a mold to shape spokes 13, 14 and a boss plate 12 in one body. Then, moldable nonferrous metal such as aluminium and the like is injected into the mold. By this molding, a boss plate 12 molded inclusively with the boss 11 in the center and horizontally symmetrical spokes 13 and 14 with the boss plate 12 connected on one end and the ring 10 exclusively molded on another end are shaped. Meanwhile, the boss plate 12, spokes 13 and 14 are taken out from the mold for trimming in the secondary process. The whole body of a handle frame thus shaped is covered with a resin cover 20 for constructing a handle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an automobile steering wheel.

Conventionally, as shown in Fig. 1, the steering wheel of an automobile has been made by welding a subring 2 with a weaker joint to a strong main link l to form an annular link 3 of the shape 1+, and a steering link shaft (as shown in Fig. 7J). boss 4 that connects
A boss spray 1-5 is welded together, and a spoke 6.
7-! ) hl to L K'1 N'k' 3 &C bath welding, and also welding the other 1 to the above phosphor rail 1-5fr...to form the frame of the bundle 119 2,
The frame is manufactured by covering the entire frame with a resin cover 8. As mentioned above, if each assembly is manufactured by /n'lχ bonding, distortion will occur at each welded part, the precision J length will be inferior, and the cost will increase due to the need for many parts to be inspected. Is it time consuming and production 1? I = bad 1. /''There was a problem with 1st place.

This invention was developed in view of the above-mentioned problems, and includes a ring made of a metal tube such as iron or a metal rod, and a metal boss. A mold is provided in which the spokes and a part of the ring are integrally molded, and a part of the ring and the boss are placed in a predetermined position in the mold. A boss plate and spokes are formed by injecting a nonferrous metal into which the ring and boss are cast, and these are joined together to form a handle frame. After the above casting, trimming is performed, and The present invention provides a method for manufacturing a steering wheel for an automobile, which is characterized in that the entire frame is resin-molded so as to be covered with a resin cover.

Hereinafter, this invention will be explained in detail with reference to actual cases shown in FIG. 2 and subsequent figures.

In the handle shown in Fig. 2, 10 is a ring formed from a single tube made of metal such as iron, 11 is a boss made of metal such as iron, 12 is a boss made of aluminum, and 13 and 14 are left and right rings made of aluminum. It is a pair of swords, and the boss plate 12. The spokes 13, 14 are molded in one piece.

The ring 10 is provided with alternating crushed parts 10a and 10b, which are formed by machining a part of a metal tube (total length: about 100) by changing the direction by 90 degrees as shown in the figure, and the crushing process increases the strength. A sub-ring section 10C is provided, which is made up of alternately crushed sections 10a and lOb, and the remaining section is a main ring section 10d.

The sub-ring portion 10c is arranged on the driver side,
Reduce the impact force when an accident occurs.

Both sides 10e and io of the sub-ring part 10c and the tip end 1-0g of the main ring part 10d are crushed from two opposing directions to form a rectangular part with an opening in cross-section, as shown in FIG. . The ring 10 has both ends 10 f , 1
0g are caulked together via rivet pieces 15 to form an annular shape. The ring 10 is a sub-ring portion 10C.
The rectangular cross-sectional portions 10e on both sides of the spokes 10e and the connecting portions of Lof and Log are set to have the same length t, and the spokes 13 and 14 are connected to these portions by a method described later.

As shown in FIGS. 3 and 4, the boss 11 has a cylindrical portion 11a.
A flange portion 11b is provided at one end, and the seven ring portions 11b
grooves llC are cut out at intervals on the periphery of the cylindrical portion tta, serrations 11 (I) for fitting the steering shaft are carved on the inner periphery of the cylindrical portion tta, and recesses li for contact surfaces are formed on the outer periphery of the cylindrical portion tta.
It is engraved with e.

The above-mentioned boss 11 and ring lO are placed in fixed positions in a mold (not shown) configured to integrally mold a pair of left and right spokes 11.14 and a boss spray 12. 11 is positioned at the center of the boss plate 12, and at this time, the groove 11C of the boss IIIQ fringe portion llb is fitted with a protrusion provided on the mold to prevent rotation.t: 7j, ring 10, the rectangular cross-sectional portion 10e and lOf-10g joint portion are placed in a mold so as to be located at one end of the spoke 14°13, and at this time, the alternately crushed portions 10a and 10b are placed in the fitting portion of the mold. The ring 10 is fitted to prevent rotation of the ring 10.

After the boss 11 and part of the ring 1O are placed in the mold as described above, a castable non-ferrous metal, which is a mixture of aluminum and magnesium, is poured into the mold. By casting,
A boss plate 12 in which the boss 11 is cast in the center, and a symmetrical spoke in which one end of the boss plate 1.2 is connected and the rectangular cross-sectional parts 102.10f and 10g of the ring 10 are cast in the other end. 18.Mold 14. that time,
As shown in FIG. 3, the boss plate 12 extends from the back surface of the flange portion 11b of the boss 11 along the outer circumferential surface of the cylindrical portion 11a, and is cast around the boss 11 with the protrusion 12a fitted in the recess 11e. , Therefore, the recess lie and the protrusion 12
The boss 11 is prevented from coming out by fitting with a, and the boss plate 12
The boss 11 is securely connected to the. In addition, at the joint between the spokes 13 and the rectangular cross-sectional portions 10f-10g of the ring 10, the spokes 13 and the ring 10 are joined, and the connection between both ends 10'' and 10g of the ring IO is also ensured. Since the portions of the ring 10 that are coupled to the spokes 13.14 have rectangular cross-sections 10e, 10f and 10g, the ring 10 is cast into the spokes 13.14 in a state where it is prevented from rotating.

As mentioned above, the boss plate 12 and spokes 13 and 14 made of an alloy of aluminum and magnesium have lower strength than iron, so ribs are formed as appropriate.
As shown in FIG. 7, the spokes 13 and 14 are fully molded with ribs 18a and 14a on both sides and in the center. As shown in Figure 5, the spokes 13 and 14 have brackets attached near the link joints.
is being molded.

25, with the boss 11 and ring 10 being cast together, the boss plate 12. After the spokes 13 and 14 are cast, they are removed from the mold and subjected to secondary trimming. By this trimming process, a cord through hole 17 is bored in the boss spray 1-12, and a bracket groove 13b is formed in the spoke 13.14.

14bl/j through holes 18 and 18 are drilled, and other necessary through holes and grooves are provided. Next, the brackets 1-19 and 19 are caulked and connected to the bracket mounting grooves 11b and 14b.

After forming the handle frame as described above, the boss plate 12. The entire spokes 1, 3, 14 and ring 10 are processed with resin in the same manner as in the past so as to cover the resin cover 20, as shown by chain lines in the figure, and the manufacturing process of the handle is completed.

Incidentally, the present invention is not limited to the above-mentioned embodiment, and as shown in FIGS. 8 to 10, the ring 10' and the spokes 13, 14
In order to prevent the ring 10' from rotating at the joint with the
Semi-collapsed portions 10'i and 10'j? with a rectangular cross section are formed at the connecting portion IQ'll of the ring 10'. A full crushing part 10' is provided on both sides, and the crushing direction is changed by 90 degrees in the central part.
k may be provided. When the ring coupling portion IQ'h has the above-described shape, the ring 10' is more securely cast into the spokes 13 and 14 and is coupled to the spokes 13 and 14 more securely.

Moreover, instead of forming the ring 10 with a single metal tube, the first
As shown in FIG. 1, a conventional ring 10'' formed from two members, a main ring 30 made of a metal tube with a large diameter cross section and a sub link 31 made of a metal tube with a small diameter cross section, may be used. As shown in the figure, the sub-ring 31 is assembled by inserting the ends 31a and 81b of the sub-ring 31 into the ends 30a and 80b of the main link 30, fitting them together for a predetermined length, and then caulking them together at two points P1 and P2. The spokes 13 and 14 of the ring 10'' are cast around the joint between the main ring 30 and the sub-ring 31, as in the example No. 111. 1 Furthermore, as shown in FIGS. 12 to 14, only one spoke 32 may be provided. That is, the link 10'' is formed from a single metal tube, and the metal tube is bent so that both ends thereof are bent toward the center. In addition, both ends and the vicinity of both ends i o''
g, to/// 11 is crushed into a rectangular cross section as shown in FIG. 13, and both ends 10''a.

The tip part 10'''C2C21O of 10'''b was completely flattened as shown in FIG. Rough portions 10''e and 10''f are also provided at positions spaced apart from io///b by a predetermined distance to prevent the ring from rotating during casting with the spokes and boss plate. The ring 10” [for
Spoke 33, both bent ends 10''a, 10'''b
and a portion 10"g at a predetermined distance from the bending part,
10"h and integrally cast with the boss spray 1-12'. In the center of the boss spray 112', a boss 11' is cast as in the example shown in t1.

In each of the above cases, the spokes and boss plate are either cast from a non-ferrous metal such as a mixture of aluminum and magnesium, or they are not limited to the above metals, as long as they are castable and relatively lightweight. .

As is clear from the above description, according to the present invention, parts of the boss and ring are placed in a mold for casting a boss plate and spokes, and a castable non-ferrous metal such as aluminum is inserted to form the boss. The boss plate and spokes are cast with the ring and
It is possible to form the frame of the handle very easily, greatly improving productivity, and it also reduces distortion and improves accuracy compared to conventional welding of each member. Furthermore, since the number of parts is reduced, costs can be reduced. moreover,
When the spokes and boss plate are made of aluminum, the nodru becomes lightweight and has various advantages such as improved operability.

[Brief explanation of drawings]

Fig. 1 is a plan view of a handle frame formed by the conventional manufacturing method, Fig. 2 is a plan view of a handle manufactured by the manufacturing method according to the present invention, and Fig. 3 is a cross section taken along the ■-I line in Fig. 2. Figure, 4th
The figure is a perspective view of the boss 11, FIG. 5 is a sectional view taken along the line ■-■ in FIG. 2, FIG. 6 is a sectional view taken along the river-phase line in FIG. 2, and FIG. 8 is a plan view of a main part showing a modification of the present invention, a sectional plan view of a main part showing a form example, FIG. 12 is a plan view showing another modification of the invention, and FIG. 1
21X+ line ■-■ cross-sectional view, No. 144.゛<I is the 12th
It is a sectional view taken along the line '1VIII-■ in the figure. IO...Ring, 11...Boss, 12.Boss plate, 18.14...Spoke, 20.Resin cover. Patent applicant: Company X, Tokai Rika Denki Mfg. Co., Ltd. Representative Patent Attorney Aoyama Sho and two others Procedural amendment ■ Case description 1982 Patent application No. 1674382 Title of invention Method for manufacturing automobile steering wheel 3, amendment Person 4 Agent (1) The following parts of the statement will be corrected. (1) On page 4, line 6, ``Figure 4'' should be corrected to ``Figures 1-6''. (2) On page 5, line 15, ``magnesium'' should be corrected to ``zinc.'' (3) Page 6, line 16, ``Magnesium 1'' has been corrected to ``zinc''. (4) On page 9, line 19 to line 2 (), ``magnesium'' will be corrected to ``zinc.'' (II) In the drawings, Figure 12 has been revised as indicated in red on the attached sheet.
L. l;ノ、”-

Claims (1)

[Claims] (1) A frame consisting of a boss that connects to the steering shaft, a boss plate that takes the boss in the center, an annular link, and spokes that connect the link to the boss plate. In the method of manufacturing a spoke, a metal boss and a link made of a metal tube or a metal rod are formed in advance, and the boss spray I- and the spoke are placed in a mold for integral molding. 2. Set the boss and a part of the ring to 11/1", insert a non-cutting metal such as aluminum into the mold, and cast the boss and spoke. It is a method for producing an automatic center wheel frame by casting the boss plate and spokes together to form a wheel frame.