JP2004243925A - Wheel with improved welding part strength - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel having improved welding part strength in a semi-full design steel wheel capable of assuring a strength of a welding part between a rim and a disk flange part irrespective of arranging a water drain part. <P>SOLUTION: A wheel 10 having an improved strength at its welding part is a semi-full design steel wheel. An axial end part 17 of a disk flange part 14 is formed to be continuous in a circumferential direction and at the same time a water drain hole 16 is formed at a part axially spaced apart from the axial end part 17 of the disk flange part 14. Both a disk 11 and a rim 12 are connected at the axial end part 17 of the disk flange part 14 by a full circumferential welding 21 having no starting or terminal end. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a weld strength improving wheel in which the strength of a weld between a rim and a disk is improved.
[0002]
[Prior art]
High-design steel wheels are broadly divided into a full design wheel 1 (a fitting line between the rim and the disc is not seen from the front side as shown in FIG. 8) and a semi-full design wheel 2 (a disc flange rim). Since the fitting portion is cut from the outer periphery and the cut portion is fitted to the inner periphery of the rim, the fitting line between the rim and the disc is not cut from the front side of the disc flange as shown in FIGS. Some parts are hidden from view from the front).
Among them, in the semi-full design wheel, a part of the disk flange (the axially rising portion of the disk) 3 is bent at several places for drainage (part a in FIGS. 6 and 7), and assembled with the rim 4. Thereby, the water draining part 5 is formed.
[0003]
[Patent Document 1]
JP 10-175401 A
[Problems to be solved by the invention]
However, as shown in FIG. 9, in the semi-full design wheel, the welding 6 for joining the rim and the disc is inevitably intermittent in the circumferential direction in order to secure the drainage portion 5.
In this case, stress is concentrated at the beginning and end of welding, and it is often difficult to secure fatigue strength. In recent years, the weight has been reduced and the rim is becoming thinner and thinner, and this tendency is increasing, and demands for securing strength are increasing.
SUMMARY OF THE INVENTION An object of the present invention is to provide a semi-full design steel wheel having a weld strength improving wheel capable of securing the fatigue strength of a weld between a rim and a disc flange despite providing a drain portion.
[0005]
[Means for Solving the Problems]
The present invention for achieving the above object is as follows.
A semi-full design steel wheel, wherein an axial end of a disk flange portion is formed continuously in a circumferential direction, and a drain hole is formed in a portion axially separated from the axial end of the disk flange portion. A weld strength improving wheel in which a disc and a rim are joined by continuous welding with no start and end over the entire circumference at the axial end of the disc flange.
[0006]
In the weld strength improving wheel of the present invention, the axial end of the disk flange portion of the semi-full design steel wheel is formed continuously in the circumferential direction, and the drain hole is formed in the axial direction from the axial end of the disk flange portion. It is formed in a separated part, and the disc and rim are joined by continuous welding without start and end over the entire circumference at the axial end of the disc flange, so despite the provision of a drain hole, the rim and disc The welded portion with the flange portion can be a continuous weld having no start and end, and the fatigue strength of the welded portion can be ensured.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the weld strength improving wheel of the present invention will be described with reference to FIGS.
The weld strength enhancing wheel 10 of the present invention is a semi-full design steel wheel in which the rim 12 and the disk 11 are welded and joined.
The disk 11 has a design surface 13 viewed from the front side, and a disk flange portion 14 (also simply referred to as a flange portion 14) bent from the design surface 13 to the back side. A decorative window 15 is provided on the design surface 13, and a drain hole 16 different from the decorative window 15 is provided on the flange portion 14. The drain hole 16 is a hole for discharging water entering a space surrounded by the bead seat portion 18 and the sidewall portion 19 of the disk 11 and the rim 12 to the front side of the wheel.
[0008]
In the weld strength improving wheel 10 of the present invention, as shown in FIGS. 1 to 3, the axial end 17 (the axial end far from the design surface 13) of the disk flange 14 is circumferentially continuous. The drain hole 16 is formed in a disk portion axially separated from an axial end 17 of the disk flange portion 14. The disk 11 and the rim 12 are joined at the axial end 17 of the disk flange portion 14 over the entire circumference of the wheel by continuous welding 21 having no start and end.
[0009]
The drain hole 16 may be a round hole as shown in FIG. 2 or a long hole elongated in the wheel circumferential direction as shown in FIG.
Also, as shown in FIGS. 2 and 3, the direction in which the flange portion 14 is separated from the bead seat portion of the rim (the inner side in the wheel radial direction) from the portion of the disc flange portion 14 where the drain hole 16 is formed to the design surface 13. The groove 20 may be formed so as to be depressed in the direction. However, the groove 20 may not be provided.
[0010]
The disk flange portion 14 is squeezed with the same shape all around, and thereafter, the groove 20 and the groove drain hole 16 are formed. The groove 20 is formed by drawing, and the drain hole 16 formed in the groove 20 can be formed by machining such as cutting, punching with a press, laser, or plasma processing.
When the groove 20 is formed, the opening of the drain hole 16 is large because the drain hole 16 is not closed by the rim.
[0011]
Next, the operation of the present invention will be described.
Since the axial end portion 17 of the disk flange portion 14 is continuous in the circumferential direction, the welded portion 21 between the disk 11 and the rim 12 at the axial end portion 17 of the disk flange portion 14 extends over the entire circumference in the wheel circumferential direction. , Continuous welding without an end, eliminating the start and end of welding, eliminating the conventional stress concentration at the start and end of welding. As a result, stress concentration can be avoided, and the fatigue strength of the weld is greatly improved.
[0012]
A fatigue strength improvement confirmation test was performed using an actual wheel of the present invention having a drain hole 16 and having an axial end portion 17 continuous in the circumferential direction and a comparative wheel which was intermittently welded in the circumferential direction.
As a result of the test, in the drum test, the comparative product (conventional product) cracked from the welded portion with a repetition load of about 1,000,000 times, while the product of the present invention showed cracking with a repetition load of about 5,000,000 times. Was. From the test results, it can be seen that the fatigue strength of about one million times in the past was improved to about 5 million times (the life was about five times that of the conventional product) in the present invention.
As a result, the conventional measures such as increasing the rim plate thickness and shot peening are not required, and the cost can be reduced (about 100 yen / piece compared with the shot peened one).
[0013]
【The invention's effect】
According to the weld strength improving wheel of the first aspect, the axial end of the disk flange portion of the semi-full design steel wheel is formed continuously in the circumferential direction, and the drain hole is formed from the axial end of the disk flange portion. The disk and the rim were joined by continuous welding without starting and ending over the entire circumference at the axial end of the disk flange. The weld between the disk flange and the disk flange can be continuously welded with no start and end, and the fatigue strength of the weld can be improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a part of a weld strength improving wheel of the present invention.
FIG. 2 is a B view of the weld strength enhancing wheel of FIG. 1 when the drain hole is a round hole.
FIG. 3 is a B view of the weld strength improving wheel of FIG. 1 when the drain hole is a long hole.
FIG. 4 is a front view of a part of a wheel for improving the strength of a weld portion according to the present invention when a groove is formed at a drain hole portion.
FIG. 5 is a view as viewed from A in FIG. 4;
FIG. 6 is a cross-sectional view of a part of a conventional semi-full design wheel.
FIG. 7 is a front view of a part of the wheel of FIG. 6;
FIG. 8 is a sectional view of a part of a conventional full design wheel.
9 is a rear view of a part of the wheel shown in FIG. 6 (a view seen from a side opposite to a design surface).
[Explanation of symbols]
DESCRIPTION OF REFERENCE NUMERALS 10 Welded part strength improving wheel 11 Disk 12 Rim 13 Design surface 14 Disk flange (also simply referred to as flange)
15 Decorative window 16 Drain hole 17 Axial end of disk flange 18 Bead seat 19 Side wall 20 Groove 21 Continuous welding without start and end (continuous weld)

Claims (1)

A semi-full design steel wheel, wherein an axial end of a disk flange portion is formed continuously in a circumferential direction, and a drain hole is formed in a portion axially separated from the axial end of the disk flange portion. And a disk and rim joined together by continuous welding without start and end at the axial end of the disk flange over the entire circumference.

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