JP2000264005A - Steel wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve both design and lightness characteristics of a two-piece steel wheel. SOLUTION: Tongue parts 14 integrally ranged with walls forming decorating holes 12 in a disc 10 is formed. These tongue parts 14 are folded toward the inside of the disc 10 and engaged with an internal circumferential face of a drop part 21 of a rim 20. The tongue parts 14 are bonded with the internal circumferential face of the drop part 21 by welding, and a peripheral end 11 of the disc 10 is formed to protrude to the vicinity of the internal circumferential face of a bead sheet part 23 of the rim 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a steel wheel, and more particularly, to a two-piece steel wheel formed by welding a rim and a disk.

[0002]

2. Description of the Related Art As a two-piece steel wheel composed of a disc and a rim, which has been frequently used in passenger cars, as shown in FIG.
Is formed in a cylindrical shape extending long in the axial direction, and formed by welding the outer peripheral end 11 of the disk 10 to the inner peripheral surface of the drop portion 21 of the rim 20 by welding (hereinafter, this is abbreviated as an abbreviation). This is called a general-purpose type).

As a two-piece steel wheel used for some passenger cars, as shown in FIG. 11, a substantially conical disk 10 having a flange 22a corresponding to a flange of a rim 20 is formed on a rim. 20 by welding to the outer end face of the bead seat portion 23 of the
0 may cover the entire rim 20 (hereinafter referred to as a full face type for short).

[0004] Reference numeral 12 denotes a decorative hole provided on the outer peripheral portion of the disk 10 for heat radiation and decoration, and a plurality of decorative holes are formed at appropriate intervals in the circumferential direction.

[0005]

However, the general-purpose steel wheel shown in FIG. 10 has a structure in which the entire disc fits in the drop of the rim. There is a problem of poor design.

Further, the full face type steel wheel shown in FIG. 11 has a wider design surface than the general-purpose type steel wheel described above, so that the design is good. Since an excessive stress is applied, it is necessary to increase the thickness of the disk, and there is a problem that the weight increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a two-piece steel wheel having a large design surface for a disk, good design, and reduced weight.

[0008]

In order to achieve the above object, a steel wheel of the present invention uses the following technical means.

A first means is a steel wheel formed by welding a rim and a disk by welding, wherein the disk is integrally connected to a wall for forming a decorative hole provided on an outer peripheral portion of the disk. The tongue formed by bending inward is welded to the inner peripheral surface of the rim, and the outer peripheral end of the disk is formed so as to protrude radially outward of the rim from the position of the tongue. It is a feature.

[0010] The second means in the first invention,
The tongue is welded to an inner peripheral surface of a drop portion of the rim. The third means is characterized in that, in the invention according to the first or second aspect, an outer peripheral end of the disk is formed so as to project so as to cover an end surface of a flange portion of the rim.

[0011]

According to the first and second means, the tongue bent and formed integrally with the wall of the decorative hole of the disk is joined to the inner peripheral surface of the rim by welding, and Since the outer peripheral end of the disk protrudes outward in the radial direction of the rim from the position of the tongue piece, the design surface of the disk can be larger than that of the conventional general-purpose type by the amount of the protruding outer peripheral end. Wheel design is improved.

Further, since the tongue is joined to the inner peripheral surface of the rim by welding, the stress applied to the disk in a practical state is reduced as compared with the conventional full-face type disk. The thickness can be made thinner than the conventional full face type.

Further, according to the third means, the second means
In addition to the above means, the outer peripheral end of the disk is formed so as to protrude so as to cover the end surface of the flange on the rim,
The same good design as the conventional full-face type can be obtained, and the thickness of the disk can be made smaller than that of the conventional full-face type, so that the weight can be reduced as compared with the conventional full-face type.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 9 using a preferred embodiment of a steel wheel of the present invention.

FIG. 1 shows a first embodiment of the present invention and shows an improved example of the conventional general-purpose steel wheel shown in FIG. In FIG. 1, the rim 20 has a flange 22 at both ends in the axial direction, a bead seat portion 23 connected to the inner side in the axial direction, and a drop portion 21 at the central portion in the axial direction. Is the same as

On the other hand, although the processing direction of the plurality of decorative holes 12 provided on the outer peripheral portion of the disk 10 will be described later, as shown in FIG.
Is bent inward to form a tongue portion 14 integrally connected to the wall in which the decorative hole 12 is formed. A plurality of the decorative holes 12 are formed at appropriate intervals in the circumferential direction of the disk 10.
2 and a plurality are formed in the circumferential direction.

The outer peripheral surfaces of the plurality of tongue portions 14 are formed so as to fit with the inner peripheral surface of the drop portion 21 of the rim 20, and these tongue portions 14 are formed by arc welding or the like.
As shown in (b), the rim 20 is welded to the inner peripheral surface of the drop portion 21. For this reason, since the disk 10 is joined to the drop portion 21 located substantially at the center of the rim 20, the stress on the disk 10 in a practical state is reduced. Outer edge 1 of disk 10 located outside outer edge 13 of a plurality of decorative holes 12 provided in disk 10
1 is a radial outside of the rim 20 from the position of the tongue 14,
That is, the rim 20 is formed so as to protrude so as to cover a portion deeper than the bead seat portion 23 to a position near the inner peripheral surface of the bead seat portion 23.

In FIG. 1, reference numeral 15 denotes a hub hole to be fitted into a hub provided on the axle of the vehicle, and 16 denotes a disc 10.
Is a bolt hole for attaching and fixing the hub to the axle hub. FIG. 2 shows a second embodiment of the present invention, which is an improved example of the conventional full face type steel wheel shown in FIG.

In FIG. 2, the rim 20 is the same as the first embodiment from the structural point of view, and the description thereof will be omitted. As shown in FIG. 2, the outer edge portion 13 of the decorative hole 12 is left and bent inward of the disk 10, thereby forming a plurality of decorative holes 12 and a plurality of tongues integrally connected to the walls on which the decorative holes 12 are formed. Portions 14 are formed and these tongues 14
Is welded to the inner peripheral surface of the drop portion 21 of the rim 20 by arc welding or the like.
This is the same as in the embodiment.

The difference from the first embodiment is that the outer peripheral end 11 of the disk 10 located outside the outer edge 13 of the plurality of decorative holes 12 provided in the disk 10 The point is that it is extended to the position to cover and is formed so as to protrude. Therefore, in the second embodiment, the appearance of the disc 10 is smaller than that of the first embodiment.
0 is larger by the extent that the outer peripheral end 11 is overhanging, and is a full face type.

Next, the processing of the plurality of decorative holes 12 provided on the outer peripheral portion of the disk 10 and the plurality of tongues 14 integrally connected to the walls on which the decorative holes 12 are formed will be described. First, as shown in FIG. 3, a disk-shaped disk material 10a made of steel is drawn in the same manner as in normal disk preforming, and at the same time, a center hole 15a serving as a hub hole is punched.

Next, the disk material 10a is squeezed into a shape as shown in FIG. 4, and a portion for forming a plurality of decorative holes is pressed to form a surface 18b having a tapered portion 18a. Part 16a and center hole 15
An annular groove 17 is formed on the outer periphery of a.

Next, as shown in FIG. 5 (a), the plurality of pressing surfaces 18b formed as described above are subjected to a required radius so that stress is not concentrated on an outer edge portion 13 which will be a bent portion described later.
It is punched into the shape of the slit 19a having a portion. FIG. 5B shows the planar shape of the slit 19a (the planar shape of the punched slit piece 19). After removing the slit piece 19, as shown in FIG. 6, the stamped surface 18b of the slit piece 19 is removed from the first mold 31 while leaving the outer edge 13.
To form a plurality of decorative holes 12 and a plurality of tongues 14 which are integrally connected to a wall on which the decorative holes 12 are formed.

Next, as shown in FIG. 7, trimming of the entire circumference is performed to remove the unnecessary outer peripheral portion 11a while leaving the outer peripheral end 11 of the disk material 10a, and to punch out a portion 16a to be a bolt hole. To make a bolt hole 16.

Thereafter, as shown in FIG.
The tongue portion 14 is formed into a shape to be fitted to the inner peripheral surface of the rim using the third and fourth molds 34, and the hub hole 15 is formed by burring and the final shape of the disk outer periphery is obtained. To manufacture.

The disk 10 processed as described above is
As shown in FIG. 9, the outer peripheral surface of each tongue portion 14 of the disk 10 is fitted to the inner peripheral surface of the drop portion 21 of the rim 20, and each of the tongue portions 14 is welded at a portion indicated by W by arc welding or the like. As a result, it is firmly joined to the inner peripheral surface of the rim 20.

In the first embodiment, the outer peripheral end 11 of the disk 10 is formed so as to protrude to near the inner peripheral surface of the bead seat portion 23 of the rim 20. If the inner peripheral surface of the rim 20 is remote, the outer peripheral end 11 of the disk 10 can be formed so as to protrude to near any inner peripheral surface of the rim 20.

[0028]

The steel wheel of the present invention is constructed as described above, and has the following effects.

Since the design surface of the disk is wider than that of the conventional general-purpose steel wheel, the design is improved, and the thickness of the disk is made thinner than that of the conventional full-face type steel wheel. Therefore, the weight can be reduced.

Further, according to the third aspect of the invention, it is possible to provide a steel wheel having both features of a conventional general-purpose steel wheel and a full-face type steel wheel.

[Brief description of the drawings]

FIG. 1 shows a general-purpose type steel wheel according to a first embodiment of the present invention, wherein (a) is a plan view and (b) is (a).
It is AA sectional drawing of.

FIG. 2 shows a full face type steel wheel according to a second embodiment of the present invention, wherein (a) is a plan view and (b).
FIG. 3A is a sectional view taken along line BB of FIG.

FIG. 3 is a fragmentary cross-sectional view showing a first processing step of the disk of the present invention.

FIG. 4 is a fragmentary cross-sectional view showing a second processing step of the disk of the present invention.

FIG. 5A is a sectional view of a key portion showing a third processing step of the disk of the present invention. (B) shows the planar shape of the slit.

FIG. 6 is a fragmentary cross-sectional view showing a fourth working step of the disk of the present invention.

FIG. 7 is a fragmentary cross-sectional view showing a fifth working step of the disk of the present invention.

FIG. 8 is a fragmentary cross-sectional view showing a sixth working step of the disk of the present invention.

FIG. 9 is a perspective view of a main part of the disk according to the present invention, showing a welded portion between the tongue of the disk and the inner peripheral surface of the rim, as viewed from the back side of the disk.

FIG. 10 is a longitudinal sectional view showing a conventional general-purpose type steel wheel.

FIG. 11 is a longitudinal sectional view showing a conventional full face type steel wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Disc 11 Outer end 12 Decorative hole 14 Tongue 20 Rim 21 Drop part 22 Flange part

Claims (3)

[Claims] 1. A steel wheel formed by welding a rim and a disc by welding, wherein the rim and the disc are bent inwardly of the disc in a state of being integrally connected to a wall for forming a decorative hole provided on an outer peripheral portion of the disc. Steel formed by welding the formed tongue to the inner peripheral surface of the rim and projecting the outer peripheral end of the disc outward in the radial direction of the rim from the position of the tongue. Made wheels. 2. The steel wheel according to claim 1, wherein the tongue is welded to an inner peripheral surface of a drop portion of the rim. 3. The steel wheel according to claim 1, wherein an outer peripheral end of the disk is formed so as to protrude so as to cover an end surface of a flange portion of the rim.