JPS5815208B2 - Wheels and their manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel consisting of a special combination of a rim and a disc, and a method for manufacturing the same. The purpose of this invention is to solve the problem of unweldability in cases where the disc is made of plastic or the like, and also to prevent air leakage, especially in the case of tubeless tires that are mounted with rivets.

Still another object of the present invention is to further increase the strength of the entire structure of the wheel by making it uniform in the circumferential direction.

In recent years, various attempts have been made to improve the structure of automobile wheels, and the development and spread of practical use of wheels has been remarkable.

However, for example, in the case of joining a rim and a disc, if both are made of weldable materials, important parts of their circumferential surfaces are arc or spot welded, or they are assembled integrally by riveting. However, especially in the case of assembly using riveting, air leakage is likely to occur from the riveted parts when using tubeless tires, and there is also a possibility that air may leak directly from the rim, including in cases such as arc welding. Since the connecting portions are only spot welded or riveted at points or portions, the strength of the wheel as a whole is not necessarily sufficient.

In addition, in cases where welding is not possible, such as when the rim and disc are made of different materials, methods such as riveting, bolting, or casting inserts made of the same material as the rim into the disc have been used. Methods such as integrally welding were used.

However, assembling the rim and disc using rivets or bolts requires drilling holes in the rim attachment part and the outer circumference of the disc, making the work process complicated and requiring a large number of parts. Since it is exposed on the circumferential side, it not only has design defects, but also has many problems, including a negative impact on commercial value.

- Even if there is a method of casting an insert material of the same material as the rim around the outer circumference of the disc, it is often not possible to do so if the disc is made of plastic, for example, because the heat removed when welding the insert material deforms the disc. It had such problems.

In view of the current situation, the present invention relates to an epoch-making invention that can eliminate all the above-mentioned conventional difficulties as a result of various research and development. The ends of each side are bent in the inner circumferential direction using each side, and are abutted and fixed to form a projecting edge, one of which is used as a disc locking piece, and the other is used as a disc locking piece. The present invention relates to a wheel in which a disk is fitted into a rim that is open in the axial direction, and the left and right sides of the disk are held by bending the protruding edges of the disk, and a method for manufacturing the same.

An embodiment of the present invention will be described below based on the drawings. 1 is an outer rim, 2 is an inner rim, and the other end portions of the outer rim 1 and the inner rim 2 are butted against each other in the inner circumferential direction. The protruding edges 1a and 2a are formed by bending.

The flange 1a, shown in broken lines in FIG. 1, is preformed in a horizontal position.

Reference numeral 3 denotes a disk, and the outer circumferential surface of the disk 3 has a protruding edge fitting groove 3a into which the protruding edge 1a of the outer rim 1 is fitted and one side of which is formed into a curved shape, and an inner rim 2.
A projecting edge fitting groove 3b into which the projecting edge 2a is inserted is formed respectively.

Note that 4 indicates the center bubble hole and 5 indicates the bolt hole.

Next, the assembly method of the present invention will be explained. As shown in FIG. 2, first, a mold or a press device (hereinafter referred to as a press device) is assembled.

) The outer rim 1 and inner rim 2, which are welded and integrated, are placed on the lower mold 7 of 6.

At this time, the protruding edge portion 1a of the outer rim 1 stands vertically in FIG.

Next, insert the protruding edge fitting groove 3b of the disc 3 into the inner rim 2.
After placing the upper die 8 of the press device 6 in contact with the protruding edge 1a of the outer rim 1, the upper die 8 of the press device 6 is pressed down in the downward direction (vertical direction) of the arrow in FIG. Fold the edge 1a and insert the groove 3a of the disc 3 into the groove 3a of the outer rim 1.
By fitting the disc 3, the disc 3 is completely compressed and fixed between the protruding edge 1a of the outer rim 1 and the protruding edge 2a of the inner rim 2.

Compared to conventional wheels assembled using bolts, nuts, rivets, etc., the wheels manufactured in this way adhere uniformly to the disc over the entire circumference of the outer rim rim and the inner rim rim. Since the wheels are fitted and fixed together, the strength of the entire wheel can be significantly increased.
As a result, the durability of the wheel can be significantly improved.

Furthermore, according to the present invention, even if the rim and disc are made of different materials, there is no risk of the disc etc. being deformed by heat as seen in conventional methods, and the assembly process of the rim and disc is performed using a press. Since the process can be completed in one step by only applying pressure using a device, it is possible to improve work efficiency.Furthermore, since assembly does not require any parts, it is not only effective in terms of production economy, but also rivet-free. Also, since the bolts are not exposed on the inner peripheral side of the wheel, it is possible to provide a wheel with high commercial value.

Furthermore, in the present invention, only the flange portion of the outer rim is instantly bent by the press device, and the projecting edge portion is inserted into the curved surface of the projecting edge fitting groove having a curved surface formed on the disk. The present invention has many advantages, such as the fact that there is no risk of fatigue cracks occurring at the projecting edge, and the bending can be done smoothly, which is convenient in terms of formability and productivity. Has excellent effects.

In addition, in the present invention, assembling the rim and the disc is made easier by making the end of the protruding edge of the inner rim stand up and creating a groove for inserting this end into the inserting groove for the protruding end of the disc. It can be made even more solid.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a half-cut cross-sectional view showing how the split wheel and disc are assembled, and Fig. 2 is a press working device showing an example of the method of assembly. FIG. 2 is a schematic longitudinal sectional view. DESCRIPTION OF SYMBOLS 1... Outer rim, 1a... Projection edge, 2... Inner rim, 2a... Projection edge, 3... Disc, 3a... Flange fitting groove, 3b... Projection fitting groove.

Claims (1)

[Scope of Claims] 1. A wheel comprising an outer rim and an inner rim each having 7 runs and 9 portions at one end, each of which has a disc held between the other sides thereof, and in which the abutting portions of the rims are fixed. 2 Consists of an outer rim and an inner rim, each of which -
The side ends are bent in the inner circumferential direction and fixed against each other to form a projecting edge, and one of the edges is used as a disc locking piece, and the other is opened in advance in the axial direction. A method for manufacturing a wheel in which a disc is inserted and one of the projecting edges is bent to hold both left and right sides of the disc.