JP3998560B2 - Lightweight wheels for automobiles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile wheel having a high lightening effect.
[0002]
[Prior art]
In general, the automobile wheel 1 has a rim 2 and a disk 3 as its basic shape, as shown in FIGS.
When the outer side is called the outer side and the opposite side is called the inner side when the vehicle is mounted on the vehicle, the rim 2 has an outer flange portion 2a, an outer bead seat portion 2b, and an outer side wall portion in order from the outer side to the inner side. 2c, a drop part 2d, an inner side wall part 2e, an inner bead sheet part 2f, and an inner flange part 2g.
The disk 3 has a rising portion 3a. In relation to the rim 2, the rising portion 3 a is fitted to the back side of the drop portion 2 d of the rim 2. As shown in FIG. 3, the back side of the drop part 2d and the end part 3e of the rising part 3a of the disk 3 depend on whether fillet welding 4 or spot welding 4 as shown in FIG. Assembled.
However, the conventional automobile wheel has the following problems.
(i) As shown in FIG. 5, since the rim 2 is formed by molding from a flat plate having the same thickness, each thickness of the completed shape is eliminated except for thinning and thickening at the time of molding. Are approximately the same thickness. Originally, it is desirable to determine each plate thickness according to the generated stress and required rigidity of each part, but since the thickness is actually matched to the thickness of the part where rigidity is most required, Many are heavy.
(ii) In the welded joint structure of the rim 2 and the disk 3, the fitting length K between the rim 2 and the disk 3 has been required to exceed 15 mm from an empirical rule. In order to reduce weight and reduce material costs, attempts have been made to shorten the rising part 3a of the disk 3 and make the fitting length with the rim shorter than 15 mm. The drop part 2d cracks from the part, the strength standard cannot be satisfied, and it is difficult to reduce the weight while maintaining the current strength.
As a method for solving these problems, as disclosed in Japanese Patent Application Laid-Open No. 2000-33801, the portion of the rim that is welded to the disk is more radially outward than the other portions. By forming a thick part with a thickness on the rim, the fitting part of the rim drop part with the disk protrudes outward in the axial direction of the rim, and as a result, the rising part of the disk is shortened, and the wheel There is a way to reduce the weight.
[0003]
[Patent Document 1]
JP 2000-33801 A (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in order to make the rim partially thick, it is necessary to manufacture a thin plate material that has been partially thickened by hot rolling, which is difficult to put into practical use in terms of its manufacturing technology and manufacturing cost. . Therefore, it is difficult to satisfy both strength maintenance or improvement and weight reduction.
An object of the present invention is to provide a lightweight vehicle wheel that can be lightened while improving the strength of the wheel.
[0005]
[Means for solving problems]
The present invention for achieving the above object is as follows.
(1) A rim having an outer flange portion, an outer bead seat portion, an outer side wall portion, a drop portion outer R portion, a drop portion, a drop portion inner R portion, an inner side wall portion, an inner bead seat portion, and an inner flange portion; In a vehicle wheel having a rising portion fitted to the back side of the drop portion of the rim, a fitting length between the back side of the drop portion of the rim and the disc rising portion exceeds 0 mm and is 15 mm or less. And reducing the thickness of the portion of the rim drop portion that is not fitted with the disk rising portion while maintaining the thickness of the portion of the rim drop portion that is fitted with the disk rising portion. By reducing the thickness of the portion of the rim drop portion that is not fitted to the disk rising portion, The drop portion back, the meat removing section is formed only in a portion that is not engaged with the disk rising portion, the plate thickness drop unit outside R portion or drop the drop portion of the rim portion forming a meat removing section A weight reduction wheel for automobiles characterized in that the thickness is 90 to 40% of the thickness of the inner portion R.
(2) In addition to the drop part back side, a meat removal part was formed in at least one part of the outside bead sheet part back side, the outside side wool part back side, the inside side wall part back side, and the inside bead sheet part back side (1) Lightweight wheels for automobiles as described.
[0006]
In the automobile weight reduction wheel of the above (1), the fitting length between the rear side of the drop part of the rim and the disk rising part, that is, the fitting of the R part of the drop part from the center position of R to the inner side of the rim 2 in the axial direction. since the length is set to a range below 15 mm beyond the 0 mm, it can be shortened disk rising portion length can be lighter disk. Further, a thickness removing portion is provided in a portion not fitted to the disk rising portion on the back side of the rim dropping portion, and the thickness of the dropping portion in the portion where the thickness removing portion is provided is 90 to the thickness of the drop R portion. Since it is 40%, the rim can be reduced in weight. In addition, the disk rise of the rim drop part is retained in the part that is not fitted with the disk rise part on the back side of the rim drop part while maintaining the thickness of the part of the rim drop part fitted with the disk rise part. The thickness of the rim drop part is reduced and the thickness of the part not mated with the disk rise part of the rim drop part is reduced. The stress that has been reduced and concentrated on the welded part of the rim disk can be distributed to other parts of the rim, cracking from the start of the welded part of the rim can be suppressed, and the durability of the rim can be improved. . Thereby, both weight reduction and strength improvement of the wheel can be achieved.
Note that changing the plate thickness of the rim partly can be easily performed by roll forming or the like because the thickness is not increased but reduced, and an increase in cost can be suppressed as compared with the increase in thickness.
In the automobile weight reduction wheel of (2), in addition to the drop part back side, at least one part of the outside bead sheet part back side, the outside side wool part back side, the inside side wall part back side, and the inside bead sheet part back side is also thinned. Therefore, the wheel can be further reduced in weight compared to (1).
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Below, the weight reduction wheel 1 for motor vehicles of this invention Example is demonstrated with reference to FIGS. 1 shows a first embodiment of the present invention, and FIG. 2 shows a second embodiment of the present invention. Components common to all the embodiments of the present invention are denoted by the same reference numerals throughout the embodiments of the present invention.
[0008]
First, the configuration and operation of a portion common to the embodiments of the present invention (first embodiment) will be described with reference to FIGS.
The automobile lightening wheel of the present invention may be made of steel or aluminum.
[0009]
The automobile lightening wheel 1 of the present invention has a rim 2 and a disk 3 as shown in FIG. The rim 2 includes an outer flange portion 2a, an outer bead seat portion 2b, an outer side wall portion 2c, a drop portion outer R portion 2h, a drop portion 2d, a drop portion inner R portion 2i, an inner side wall portion 2e, and an inner bead seat portion 2f. The inner flange portion 2g is provided. Among the names of each part, “outside” means a part close to the outside of the vehicle in the width direction (axial direction) of the wheel when the wheel is mounted on the vehicle, and “inside” means close to the inside of the vehicle. Used to represent the site.
[0010]
Conventionally, when the rising portion 3a of the disk 3 is fitted to the drop portion 2d of the rim 2 and the drop portion 2d and the end portion 3e of the rising portion 3a of the disk 3 are fillet welded, as described above, Cracks were generated from the starting end of 4. Since the cause of cracks is the structure in which stress is likely to concentrate at the site, improvement in the formation of the bead shape of the weld has been the main measure.
On the other hand, as a result of analyzing the cause of stress generation from the overall structure of the wheel and the deformation state at the time of running, the plate thickness of the rim drop portion 2d in the vicinity of the welded portion between the rim 2 and the end portion 3e of the rising portion 3a of the disk 3 is determined. By consciously reducing the thickness of the rim 2 and reducing the rigidity of the rim 2, it was found that the stress concentration on the weld end can be dispersed to other parts and the durability of the wheel can be increased. This is the case in the present invention.
[0011]
The range of the length in the wheel axis direction of the fitting portion K between the rear portion of the drop portion 2d of the rim 2 and the portion to be fitted with the rising portion 3a of the disk 3 is the rim from the R center position of the R portion of the drop portion. 2 is in the range of more than 0 mm and 15 mm or less in the axially inner direction. Under this condition, the length of the rising portion 3a of the disk 3 can be shortened within this range, so that the weight of the disk 3 can be reduced. The reason for setting it to more than 0 mm and not more than 15 mm is 0 mm or less, that is, when the fitting length of the disk 3 is reduced from the R center position of the R portion of the drop portion to the outside of the rim 2, the required durability strength is maintained. I couldn't. Further, when the fitting length is longer than 15 mm, the effect of reducing the weight is small compared to the conventional case.
[0012]
On the back side (inner peripheral side) of the rim 2 except for the fitting portion K with the disk 3, the thickness in the range of 10 to 60% compared to the plate thickness of the R portions 2h and 2i of the drop portion 2d. A removal portion G is provided, and the thickness of the rim portion provided with the meat removal portion G is reduced to 90 to 40% of the plate thickness of the R portions 2h and 2i of the drop portion 2d. That is, assuming that the thickness of the R portions 2h and 2i of the drop portion 2d is T, the thickness of the meat removal is 0.1 to 0.6T, and the remaining rim and drip portion thickness is 0.9 to 0.4T. is there.
The numerical basis of 60% is because when the thickness exceeds 60%, the remaining rim and drip portion thickness becomes too thin to secure the strength of the drop portion 2d. The numerical basis of 10% is 10% This is because if the amount is smaller, the effect of reducing the thickness is reduced.
[0013]
The meat removing portion G is provided on the back side (inner peripheral side) of the rim 2. The reason is that when the meat removing part G is also provided in the bead sheet part, it is provided on the back side so as not to affect the seal with the tire bead, but the meat removing part provided in the drop 2d is also provided in the bead sheet part. By setting the same rim back side as the meat removing portion to be formed, the meat removing portion can be simultaneously formed with a single roll provided with convex portions on the portion corresponding to the bead sheet portion and the portion corresponding to the drop portion, respectively. It is.
The disc 3 is fitted to the fitting portion K, and the tip portion 3b of the rising portion 3a and the back side of the drop portion 2d are welded. The welding is, for example, carbon dioxide welding, argon welding, or arc welding.
[0014]
The operation of the above configuration will be described.
In the above-described automobile lightening wheel, the rim 2 of the wheel 1 is formed by providing the meat removal part G on the back side of the drop part 2d to reduce the drop part 2d and consciously weakening the rigidity of the drop part 2d. The concentration of stress on the welded portion and the starting end portion of the disk 3 can be distributed to other portions. As a result, it is possible to prevent the rim 2 from cracking from the welded portion and the starting end portion, and to improve the durability of the wheel.
Further, since the meat removing portion 2d is provided on the back side of the drop portion 2d, the rim 2 is reduced in weight. Furthermore, since the rising portion 3a of the disk 3 can be shortened, the weight of the disk 3 can be reduced.
As a result, both the weight reduction of the wheel and the improvement of the durability strength of the wheel can be achieved together.
[0015]
Next, each embodiment of the present invention will be described.
The configuration and operation of the first embodiment of the present invention are as described in the configuration and operation common to the first and second embodiments.
[0016]
Next, a second embodiment of the present invention will be described.
The second embodiment of the present invention is different from the first embodiment in that the meat removing portion G has an outside with sufficient stress in addition to the drop portion 2d where the meat removing portion G is formed in the first embodiment. The back side of the bead sheet part 2b, the back side of the inside bead sheet part 2f, the back side of the outside side wall part 2c, the back side of the inside side wall part 2e, or in some cases, the outside bead sheet part 2b and the outside side wall part 2c It is formed in the outer side R part 2j to connect. The thickness of the meat removal part G in each part is in the range of 10 to 60% of the plate thickness of the R parts 2h and 2i of the drop part 2d, and the thickness of the rim part reduced in thickness by providing the meat removal part G. The thickness is in the range of 90 to 40% of the plate thickness of the R portions 2h and 2i of the drop portion 2d. That is, assuming that the plate thickness of the R portions 2h and 2i of the drop portion 2d is T, the thickness of the meat removal is 0.1 to 0.6T, and the remaining rim portion thickness is 0.9 to 0.4T. is there.
The operation of the second embodiment is that, since the thinned portion of the rim 2 is increased in addition to the first embodiment, further weight reduction can be obtained as compared with the first embodiment.
[0017]
【The invention's effect】
According to the lightening wheel for automobiles of claim 1, since the fitting length between the back side of the drop part of the rim and the disk rising part is set in the range of more than 0 mm and not more than 15 mm , the disk rising part length can be shortened. Can be reduced in weight. In addition, the disk rise of the rim drop part is retained in the part that is not fitted with the disk rise part on the back side of the rim drop part while maintaining the thickness of the part of the rim drop part fitted with the disk rise part. A thickness removing portion formed by reducing the thickness of the portion not mated with the disc rising portion of the rim drop portion by reducing the thickness of the portion not mated with the portion, Since the thickness of the provided drop portion is 90 to 40% of the thickness of the drop R portion, the rim can be reduced in weight. In addition, since the meat removal part is provided in the part that is not fitted with the disk rising part on the back side of the rim drop part, the rigidity of the rim is reduced, and the stress concentrated on the welded part of the rim with the disk is applied. It can be dispersed in other parts, crack generation from the welded end of the rim can be suppressed, and the durability of the rim can be improved. Thereby, both weight reduction and strength improvement of the wheel can be achieved.
According to the weight reduction wheel for automobiles of claim 2, in addition to the back side of the drop part, at least one part of the back side of the outside bead sheet part, the back side of the outside side wool part, the back side of the inside side wall part, and the back side of the inside bead sheet part is also reduced. Since the meat is made thicker, the wheel can be made lighter than when only the drop part is thinned.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an automobile lightening wheel according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of an automobile lightening wheel according to a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of a conventional automobile wheel (rim and disk are welded all around).
FIG. 4 is a cross-sectional view of a conventional vehicle wheel (rim and disk are spot welded).
FIG. 5 is a cross-sectional view showing a crack occurrence location of a conventional disc wheel.
[Explanation of symbols]
1 Wheel 2 Rim 2a Outer flange portion 2b Outer bead seat portion 2c Outer side wall portion 2d Drop portion 2e Inner side wall portion 2f Inner bead seat portion 2g Inner flange portion 2h Drop portion outer R portion 2i Drop portion inner R portion 3 Disc 3a Rising part 3b End part 4 Weld bead G Meat removal part K Fitting part

Claims (2)

A rim having an outer flange portion, an outer bead seat portion, an outer side wall portion, a drop portion outer R portion, a drop portion, a drop portion inner R portion, an inner side wall portion, an inner bead seat portion, and an inner flange portion; a disk having a rising portion to be fitted to the drop unit back, the vehicle wheel having a fitting length of the the drop unit back side of the rim disc rising portion in the range of 15 mm or less than the 0 mm Setting, and reducing the thickness of the portion of the rim drop portion that is not fitted with the disk rising portion while maintaining the plate thickness of the portion of the rim drop portion that is fitted with the disk rising portion, by reducing the thickness of the disc rising portion and the fitted portion without the drop portion of the rim, the drop of the rim Back side of the disc rising portion and fitted meat removing section formed only in the portion not, the drop portion of the plate drop unit outside R portion or drop portion inside the thickness of the rim portion forming a meat removing section A lightweight wheel for automobiles characterized in that it is 90 to 40% of the thickness of the R portion.   The automobile according to claim 1, wherein a meat removing part is formed in at least one part of the back side of the outer bead sheet part, the back side of the outer side wool part, the back side of the inner side wall part, and the back side of the inner bead sheet part in addition to the back side of the drop part. For lightweight wheels.

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