JP2005153666A - Aluminum wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum wheel capable of effectively reducing resonance peak level of the wheel by efficiently obtaining rigidity change of a secondary component of the wheel on the circumference thereof without complicating structure nor increasing weight. <P>SOLUTION: A plurality of narrow grooves 10 and 11 extended in the radial direction are formed in a peripheral edge part 3B of a rim-disk bonding part 3A formed thick in a back surface of a disk 3 and a hub fitting surface 4 in the circumferential direction. Among three elements of groove intervals I1 and I2, groove width W1 and W2 and groove depth D1 and D2 of the narrow grooves 10 and 11, the groove intervals I1 and I2 are formed different from each other to obtain rigidity change of a secondary component of the aluminum wheel 1 on the circumference thereof. With this structure, appearance can be excellently maintained and circumferential rigidity of the wheel can be effectively changed without complicating structure nor increasing weight. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an aluminum wheel mounted on a vehicle.

  When the wheel resonates when traveling on rough roads, etc., there may be noise in the passenger compartment due to this, but as a countermeasure against this, it is conceivable to reduce the peak level due to wheel resonance, In general, there are known techniques for damping vibrations by attaching damping materials to the wheels to increase the damping characteristics of the wheels themselves or adding dynamic dampers.

However, in this case, the addition of the damping material and the dynamic damper increases the complexity of the structure and the weight. Therefore, the rigidity of the wheel itself is changed in the circumferential direction (for example, in Patent Document 1, an opening is formed in the disk). In addition, in Patent Document 2, the curved protruding portion of the disk is an ellipse), and by obtaining the rigidity change of the secondary component on the circumference, the resonance of the wheel is achieved without complicating the structure or increasing the weight. A wheel that can reduce the peak level has been proposed.
JP 2002-264603 A (page 4, FIG. 1) Japanese translation of PCT publication No. 2003-501305 (first page, FIG. 1)

  However, in changing the rigidity of the wheel itself in this way, it is not possible to form an opening in the disk (in this case, a relatively large opening) or to deform the curved protrusion to such an extent that a change in rigidity can be obtained. Only when the material of the wheel is high rigidity steel.

  In other words, steel wheels (steel wheels) and light alloy (aluminum wheels) are generally available on the market, but for aluminum wheels made from low-rigidity aluminum alloys, the stiffness change method is adopted. Things get harder.

  Therefore, in view of such conventional problems, the present invention does not involve a complicated structure or an increase in weight, and even in a wheel made of an aluminum alloy, the rigidity of the secondary component on the periphery of the wheel. It is an object of the present invention to provide an aluminum wheel that effectively reduces the resonance peak level of the wheel by efficiently obtaining the change.

  The invention of claim 1 is an aluminum wheel comprising a rim for mounting a tire, a disk disposed inside the rim, and a hub mounting surface provided at the center of the disk, wherein the rigidity of the wheel is varied. In an aluminum wheel whose rigidity is changed so that a secondary component can be obtained on the circumference of the wheel with a peak position of 180 degrees in the circumferential direction, narrow grooves extending in a substantially radial direction are formed in the circumferential direction on the back surface of the disk. A plurality of them are formed, and the circumferential rigidity of the wheel is changed by these narrow grooves.

  According to a second aspect of the present invention, the thin groove according to the first aspect is a thickened hub that reaches the hub mounting surface and / or a thickened rim / disk joint that is a joint between the rim and the disk. It is characterized by being arranged at the outer peripheral edge of the mounting surface.

  According to a third aspect of the present invention, the narrow groove according to the first or second aspect is characterized in that the groove interval of each narrow groove is non-uniform so that a change in rigidity of a secondary component can be obtained on the circumference. .

  According to a fourth aspect of the present invention, the narrow groove according to the first or second aspect is characterized in that the width of each narrow groove is non-uniform so that a change in rigidity of a secondary component can be obtained on the circumference. .

  According to a fifth aspect of the present invention, the narrow groove according to the first or second aspect is characterized in that the groove depth of each narrow groove is non-uniform so that a change in rigidity of a secondary component can be obtained on the circumference. Yes.

  According to a sixth aspect of the present invention, in the narrow groove according to the first or second aspect, at least two elements such as a groove interval, a groove width, or a groove depth of each narrow groove are obtained, and a rigidity change of a secondary component is obtained on the circumference. It is characterized by non-uniformity.

  According to the first aspect of the present invention, the narrow groove does not penetrate the disk and does not change the shape of the disk, and the appearance of the aluminum wheel is not affected while maintaining the original shape of the aluminum wheel. Since there is a narrow groove on the back, there is no complicated structure or increased weight, and the wheel's circumferential rigidity is effectively changed while maintaining good appearance. A change in rigidity of the secondary component can be obtained on the circumference, and thus the resonance peak level of the wheel can be effectively reduced.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, since the narrow grooves are arranged at the outer peripheral edge of the rim / disk joint and / or the hub mounting surface, these arrangement parts are the disks. Since the thickness of the thin groove is such that the depth of the narrow groove can be deepened, the rigidity of the wheel can be adjusted efficiently.

  According to the invention described in claim 3, in addition to the effect of the invention of claim 1 or 2, the change in rigidity of the secondary component on the circumference is effectively achieved by making the groove interval of each narrow groove non-uniform. Therefore, the design for forming the narrow groove can be facilitated.

  According to the invention described in claim 4, in addition to the effect of the invention of claim 1 or 2, by making the groove width of each narrow groove non-uniform, it is possible to effectively change the rigidity of the secondary component on the circumference. Therefore, the design for forming the narrow groove can be facilitated.

  According to the invention described in claim 5, in addition to the effect of the invention of claim 1 or 2, the change in rigidity of the secondary component on the circumference is effective by making the groove depth of each narrow groove non-uniform. Therefore, the design for forming the narrow groove can be facilitated.

  According to the sixth aspect of the present invention, in addition to the effect of the first or second aspect of the invention, at least two elements of the groove interval, groove width, or groove depth of each of the narrow grooves are assumed to be nonuniform and 2 on the circumference. Since the rigidity change of the secondary component is obtained, the rigidity change of the secondary component can be accurately set by adjusting a plurality of elements.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
1 and 2 show a first embodiment of an aluminum wheel of the present invention, FIG. 1 is a rear view of the wheel, and FIG. 2 is a cross-sectional view of the upper half of the wheel.

  As shown in FIG. 2, the aluminum wheel 1 of the first embodiment is formed by integrally molding a rim 2 for mounting and holding a tire (not shown) and a disk 3 for attaching the rim 2 to a vehicle-side hub. It is.

  The disk 3 is connected to the inner periphery of the front side (left side in FIG. 2) end of the rim 2, and a hub mounting surface 4 is formed at the center of the disk 3 for mounting on a hub on the vehicle body side outside the figure. The hub mounting surface 4 is formed in a circular shape, and a plurality of bolt insertion holes 4a are formed on the periphery of the hub mounting surface 4 so as to be inserted into planted bolts protruding from the hub.

  The disk 3 is generally thicker than the rim 2, and in particular, the rim / disk joint portion 3 </ b> A serving as a joint portion with the rim 2 and the hub mounting surface 4 leading to the hub mounting surface. Each of the outer peripheral edge portions 3 </ b> B is formed thicker on the back side of the disk 3.

  Here, as shown also in FIG. 1, narrow grooves 10 and 11 extending in the radial direction are formed in the rim / disk joint portion 3A and the outer peripheral edge portion 3B of the hub mounting surface 4 which are thickened on the back surface of the disc 3. Are formed in the circumferential direction, and the circumferential rigidity of the wheel 1 is changed by these narrow grooves 10 and 11.

  That is, a plurality of the narrow grooves 10 and 11 are formed with groove widths W1 and W2 (see FIG. 1) and groove depths D1 and D2 (see FIG. 2), with groove intervals I1 and I2 provided in the circumferential direction, respectively. is there.

  Further, the radial lengths L1 and L2 of the narrow grooves 10 and 11 are equal in length so that each takes a maximum length in a state where the rim / disk joint portion 3A and the outer peripheral edge portion 3B are constrained by the cross-sectional shapes. Is formed.

  Here, in this embodiment, among the three elements of the groove intervals I1, I2, the groove widths W1, W2 and the groove depths D1, D2 of the narrow grooves 10, 11, the groove intervals I1, I2 are made non-uniform. As a result, the rigidity change of the secondary component is obtained on the aluminum wheel 1 on the circumference.

  In other words, it is generally known to reduce the road noise by controlling the rigidity of the wheel, and this rigidity control varies the wheel eigenvalue depending on the excitation position, thereby dispersing the frequency during rotation and increasing the resonance peak level of the wheel. Reduce.

  In this case, considering the unbalance of the wheel and the amplitude of the rigidity, it is optimal to reduce the rigidity at two locations on the circumference of the wheel. In this case, in order to maintain the weight balance of the wheel, the high and low rigidity portions are It is necessary to have a positional relationship of 180 degrees.

  Accordingly, in the present embodiment, as shown in FIG. 1, the upper and lower directions in the drawing of the aluminum wheel 1 are set as the low rigidity portion Rs, and the left and right directions in the drawing are set as the high rigidity portion Rh. The narrow grooves 10 and 11 narrow the upper and lower groove intervals I1 and I2 which are the low portions Rs, and widen the left and right groove intervals I1 and I2 which are the high portions Rh. The intervals I1 and I2 are formed so as to gradually spread from the central portion of the low portion Rs to the central portion of the high portion Rh as a whole.

  At this time, the lower rigid portion Rs of the upper and lower portions are arranged opposite to each other with a rotation angle of 180 degrees, and the higher rigid portion Rh of the left and right portions are arranged opposite to each other with a rotation angle of 180 degrees. Rs and the high portion Rh are arranged with a rotation angle of 90 degrees.

  In this case, the groove widths W1 and W2 and the groove depths D1 and D2 are formed uniformly over the entire circumference.

  The disk 3 has a plurality of punched holes in the region between the narrow groove 10 of the rim / disk joint portion 3A and the narrow groove 11 of the outer peripheral edge portion 3B, which are trapezoidal at equal intervals in the circumferential direction. 3c is formed.

  According to the aluminum wheel 1 of the first embodiment having the above configuration, the narrow grooves 10 and 11 are formed in the rim / disk joint portion 3A of the disc 3 and the outer peripheral edge portion 3B of the hub mounting surface 4, so that the aluminum wheel 1 In this case, the narrow grooves 10 and 11 do not penetrate the disk 3 and the shape of the disk 3 is not changed, and the original shape of the aluminum wheel 1 is reduced. It can form in the state which maintained the shape.

  Therefore, the rigidity control can be performed without greatly reducing the rigidity of the entire aluminum wheel 1 without complicating the structure and increasing the weight.

  Further, since the narrow grooves 10 and 11 are formed on the back surface of the disk 3, the circumferential rigidity of the aluminum wheel 1 is effectively changed while maintaining good appearance, so that the secondary grooves are formed on the circumference of the wheel 1. Since the rigidity change of the component can be obtained, the resonance peak level of the wheel can be effectively reduced.

  By the way, in the present embodiment, in addition to the above-described effects, the narrow grooves 10 and 11 are arranged at the rim / disk joint portion 3A and the outer peripheral edge portion 3B of the hub mounting surface 4. Since this is a thickened portion and the groove depth of the narrow grooves 10 and 11 can be deepened at the thickened portion, the rigidity of the wheel 1 can be adjusted efficiently.

  Further, the rigidity control by the narrow grooves 10 and 11 can effectively obtain a change in rigidity of the secondary component on the circumference by making the groove intervals I1 and I2 of the narrow grooves 10 and 11 non-uniform. Therefore, the rigidity control at this time may be calculated by setting the groove widths W1 and W2 and the groove depths D1 and D2 to be constant and using only the intervals I1 and I2 of the narrow grooves 10 and 11 as variables. , 11 can be easily designed.

  In this embodiment, when the rigidity is controlled, the narrow grooves 10 and 11 are formed in both the rim / disk joint portion 3A and the outer peripheral edge portion 3B of the hub mounting surface 4. -You may form only in either one of the disc junction part 3A or the said outer periphery part 3B.

  In this embodiment, among the three elements of the groove intervals I1 and I2, the groove widths W1 and W2 and the groove depths D1 and D2 of the narrow grooves 10 and 11, the groove intervals I1 and I2 are not uniform, and the rigidity of the secondary component Although the change is obtained, the non-uniform element is not limited to the groove intervals I1 and I2, and may be the groove widths W1 and W2 or the groove depths D1 and D2. Can play.

  Table 1 below shows the results of measuring vehicle interior noise in a running experiment with the aluminum wheel 1 of the present embodiment mounted. As a comparison object of the present embodiment, (1) a conventional case without a narrow groove (2) As shown in FIG. 3, a plurality of narrow grooves 10 and 11 having uniform groove widths W1 and W2 and groove depths D1 and D2, and groove intervals I1 and I2 are made uniform in the circumferential direction. The aluminum wheel H formed in the above was used (the other structure is the same as that of the first embodiment).

  The driving experiment in this case is a case where two passengers are occupying a 2000 cc class passenger car and driving on a rough asphalt road at a vehicle speed of 50 km / h, and the vehicle interior noise is measured at the driver's ear.

The tire size was 185 / 70R14, 200 Kpa, and the aluminum wheel 1 was 6JJ-14.

  As a result, in the aluminum wheel 1 of the first embodiment, the sound pressure level could be reduced by about 1.3 dB.

(Second Embodiment)
FIG. 4 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 4 is a rear view of the wheel.

  As shown in FIG. 4, the aluminum wheel 1a of the second embodiment has a thickened rim / disk joint 3A on the back surface of the disk 3 and the outer peripheral edge of the hub mounting surface 4 as in the first embodiment. A plurality of radially extending narrow grooves 10, 11 are formed in the portion 3B in the circumferential direction, and the circumferential rigidity of the wheel 1a is changed by the narrow grooves 10, 11.

  In the present embodiment, among the three elements of the groove intervals I1, I2, the groove widths W1, W2 and the groove depths D1, D2 of the narrow grooves 10, 11, the groove intervals I1, I2 and the groove widths W1, W2 are set as follows. By making each non-uniform, the rigidity change of the secondary component is obtained on the circumference of the aluminum wheel 1a.

  That is, as shown in FIG. 4, the narrow grooves 10 and 11 narrow the groove distances I1 and I2 in the upper and lower portions in the figure, which are the low rigidity portion Rs of the aluminum wheel 1a, and the groove widths W1 and W2. , The groove spacings I1 and I2 in the left and right portions in the figure, which are high rigidity portions Rh, are widened, and the groove widths W1 and W2 are narrowed.

  Accordingly, the groove intervals I1 and I2 gradually increase from the central portion of the low portion Rs to the central portion of the high portion Rh, as in the first embodiment, and the groove widths W1 and W2 have the central portion of the low portion Rs. It changes most gradually from the central portion of the low portion Rs to the central portion of the narrowest high portion Rh.

  Of course, even in this embodiment, the upper and lower rigid portions Rs are opposed to each other with a rotation angle of 180 degrees, and the left and right rigid portions Rh are opposed to each other with a rotation angle of 180 degrees. The low portion Rs and the high portion Rh are arranged with a rotation angle of 90 degrees.

  In this case, the groove depths D1 and D2 are formed uniformly over the entire circumference.

  Therefore, according to the aluminum wheel 1a of the second embodiment, the same effect as that of the first embodiment can be obtained, and the rigidity control by the narrow grooves 10, 11 can be controlled by the grooves of the narrow grooves 10, 11. By making the intervals I1 and I2 and the groove widths W1 and W2 non-uniform, the rigidity change of the secondary component is effectively obtained on the circumference. The distances D1 and D2 are constant, and the intervals I1 and I2 of the narrow grooves 10 and 11 and the groove widths W1 and W2 are calculated as variables, and the change in rigidity of the secondary component is accurately set by adjusting a plurality of elements. be able to.

  Even in this embodiment, as in the first embodiment, the rigidity control is performed without forming the narrow grooves 10 and 11 in both the rim / disk joint portion 3A and the outer peripheral edge portion 3B of the hub mounting surface 4. It may be formed only on either one of the rim / disk joint 3A or the outer peripheral edge 3B.

  In the present embodiment, among the three elements of the groove intervals I1, I2, the groove widths W1, W2 and the groove depths D1, D2 of the narrow grooves 10, 11, the groove intervals I1, I2 and the groove widths W1, W2 are not set. Although the rigidity change of the secondary component is obtained as uniform, even if the elements to be non-uniform are the groove intervals I1 and I2 and the groove depths D1 and D2, the same effect can be obtained.

(Third embodiment)
FIG. 5 shows a third embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 5 is a rear view of the wheel.

  As shown in FIG. 5, the aluminum wheel 1b according to the third embodiment has a thickened rim / disk joint 3A on the back surface of the disk 3 and an outer peripheral edge of the hub mounting surface 4 as in the first embodiment. A plurality of narrow grooves 10 and 11 extending in the radial direction are formed in the portion 3B in the circumferential direction, and the circumferential rigidity of the wheel 1b is changed by the narrow grooves 10 and 11.

  In this embodiment, all the three elements of the groove intervals I1, I2, the groove widths W1, W2 and the groove depths D1, D2 of the narrow grooves 10, 11, that is, the groove intervals I1, I2 and the groove widths W1, W2 are used. Further, by making the groove depths D1 and D2 non-uniform, the rigidity change of the secondary component on the circumference of the aluminum wheel 1b is obtained.

  That is, as shown in FIG. 5, the narrow grooves 10 and 11 are formed by narrowing the groove intervals I1 and I2 in the upper and lower portions of the aluminum wheel 1b, which is the low rigidity portion Rs, and widening the groove widths W1 and W2. In addition, the groove depths D1 and D2 are made deeper, the groove intervals I1 and I2 in the left and right portions in the figure, which are the high rigidity portions Rh, are widened, the groove widths W1 and W2 are narrowed, and the groove depths D1 and D2 are narrowed. D2 is shallow.

  Accordingly, the groove intervals I1 and I2 gradually increase from the central portion of the low portion Rs to the central portion of the high portion Rh, as in the first embodiment, and the groove widths W1 and W2 have the central portion of the low portion Rs. Widest, it gradually changes from the central part of the low part Rs to the central part of the narrowest high part Rh, and the groove depths D1 and D2 are deepest in the central part of the low part Rs, The central portion of the low portion Rs changes in stages from the shallowest high portion Rh to the central portion.

  Of course, in the present embodiment as well, as in the first embodiment, the upper and lower rigid portions Rs are opposed to each other with a rotation angle of 180 degrees, and the left and right rigid portions Rh are 180. The low portion Rs and the high portion Rh are arranged with a rotation angle of 90 degrees.

  Therefore, according to the aluminum wheel 1b of the third embodiment, the same effect as that of the first embodiment can be obtained, and the rigidity control by the narrow grooves 10, 11 can be controlled by the grooves of the narrow grooves 10, 11. Since the intervals I1, I2, the groove widths W1, W2 and the groove depths D1, D2 are not uniform, the change in rigidity of the secondary component can be set with higher accuracy by adjusting these plural elements.

  In this embodiment as well, the narrow grooves 10 and 11 may be formed only in either the rim / disk joint portion 3A or the outer peripheral edge portion 3B of the hub mounting surface 4 as in the first embodiment. .

(Fourth embodiment)
FIG. 6 shows a fourth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 6 is a rear view of the wheel.

  As shown in FIG. 6, the aluminum wheel 1 c according to the fourth embodiment has a thickened rim / disk joint 3 </ b> A on the back surface of the disk 3 and the outer peripheral edge of the hub mounting surface 4 as in the first embodiment. A plurality of narrow grooves 10 and 11 extending in the radial direction are formed in the portion 3B in the circumferential direction, and the circumferential rigidity of the wheel 1 is changed by the narrow grooves 10 and 11.

  In the present embodiment, the groove intervals I1 and I2 of the narrow grooves 10 and 11 are made equal over the entire circumference, and the groove widths W1 and W2 are made non-uniform so that the aluminum wheel 1c has 2 on the circumference. In this case, the groove depths D1 and D2 are formed uniformly over the entire circumference.

  That is, as shown in FIG. 6, the narrow grooves 10 and 11 widen the groove widths W1 and W2 in the upper and lower portions of the aluminum wheel 1a as the low rigidity portion Rs of the aluminum wheel 1a, and the high rigidity portion Rh. The groove widths W1 and W2 in the left and right portions in the figure are narrowed.

  Further, even in the present embodiment, the groove widths W1 and W2 are widest at the center portion of the low portion Rs, and gradually change from the center portion of the low portion Rs to the center portion of the high portion Rh that is the narrowest. ing.

  Of course, even in this embodiment, the upper and lower rigid portions Rs are opposed to each other with a rotation angle of 180 degrees, and the left and right rigid portions Rh are opposed to each other with a rotation angle of 180 degrees. The low portion Rs and the high portion Rh are arranged with a rotation angle of 90 degrees.

  Therefore, according to the aluminum wheel 1c of the fourth embodiment, the same effect as that of the first embodiment can be obtained, and the rigidity control by the narrow grooves 10, 11 can be controlled by the grooves of the narrow grooves 10, 11. By making the widths W1 and W2 non-uniform, the rigidity change of the secondary component can be effectively obtained on the circumference. Therefore, the rigidity control at this time is controlled by the groove intervals I1 and I2 and the groove depth. It is only necessary to calculate D1 and D2 as constants and only the groove widths W1 and W2 as variables, and the design for forming the narrow grooves 10 and 11 can be facilitated.

  In this embodiment as well, the narrow grooves 10 and 11 may be formed only in either the rim / disk joint portion 3A or the outer peripheral edge portion 3B of the hub mounting surface 4 as in the first embodiment. .

  Here, when the groove spacings I1 and I2 of the narrow grooves 10 and 11 are made uniform as in the present embodiment, the groove widths W1 and W2 are made uniform, and the groove depths D1 and D2 are made non-uniform on the circumference, and the secondary. It is good also as a structure which acquires the rigidity change of a component, and it is good also as a structure which obtains the rigidity change of a secondary component by making both groove width W1, W2 and groove depth D1, D2 non-uniform | heterogenous on the circumference, There is an effect.

  Of course, even in this case, the narrow grooves 10 and 11 can be formed only in either the rim / disk joint portion 3A or the outer peripheral edge portion 3B of the hub mounting surface 4.

  By the way, although the aluminum wheel of this invention was demonstrated taking the example in the said 1st-4th embodiment, various other embodiments are employ | adopted in the range which is not restricted to these embodiments and does not deviate from the summary of this invention. Can do.

It is a reverse view of the aluminum wheel which shows 1st Embodiment of this invention. It is sectional drawing of the upper half part of the aluminum wheel with which this invention is applied. It is a reverse view of the aluminum wheel used as a comparison object for the noise measurement of the aluminum wheel shown in 1st Embodiment. It is a reverse view of the aluminum wheel which shows 2nd Embodiment of this invention. It is a reverse view of the aluminum wheel which shows 3rd Embodiment of this invention. It is a reverse view of the aluminum wheel which shows 4th Embodiment of this invention.

Explanation of symbols

1, 1a, 1b, 1c, 1d Aluminum wheel 2 Rim 3 Disc 3A Rim / disc joint 3B Outer peripheral edge of hub mounting surface 4 Hub mounting surface 10, 11 Narrow groove I1, I2 Groove spacing W1, W2 Groove width D1, D2 Groove depth Rs Low rigidity part Rh High rigidity part

Claims (6)

An aluminum wheel provided with a rim for mounting a tire, a disk disposed inside the rim, and a hub mounting surface provided at the center of the disk, wherein the peak position of the rigidity variation of the wheel is 180 in the circumferential direction. As a positional relationship of degrees, in a wheel whose rigidity has been changed so that a secondary component can be obtained on the circumference of the wheel,
An aluminum wheel characterized in that a plurality of narrow grooves extending substantially in the radial direction are formed on the back surface of the disk in the circumferential direction, and the circumferential rigidity of the wheel is changed by these narrow grooves.   The narrow groove is characterized in that it is arranged at the outer peripheral edge of the thickened rim / disk joint and / or the thickened hub mounting surface leading to the hub mounting surface, which becomes the joint between the rim and the disk. The aluminum wheel according to claim 1.   3. The aluminum wheel according to claim 1, wherein the narrow groove has a non-uniform spacing between the narrow grooves so that a change in rigidity of a secondary component can be obtained on the circumference.   3. The aluminum wheel according to claim 1, wherein the narrow groove has a non-uniform groove width so that a change in rigidity of a secondary component can be obtained on the circumference.   3. The aluminum wheel according to claim 1, wherein the narrow groove has a non-uniform groove depth so that a change in rigidity of a secondary component can be obtained on the circumference. 2. The narrow groove is characterized in that at least two elements of a groove interval, a groove width, or a groove depth of each narrow groove are non-uniform so that a change in rigidity of a secondary component can be obtained on the circumference. Or the aluminum wheel of 2.

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