JP2010095125A - Vehicle wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle wheel enabling improvement in mass productivity and reliable rotation prevention, while enabling accurate tuning of a resonance frequency to be muted. <P>SOLUTION: This vehicle wheel is provided by fixing a sub-air chamber member 13 on an outer peripheral surface 11d of a well part 11c in a tire air chamber. The vehicle wheel is characterized in that the sub-air chamber 13 has a body part 13a forming a sub-air chamber SC, an edge part 13e extending from the body part 13a, a projection part 18a of partially projecting the body part 13a, and a rotation preventive part 18 extending from the projection part 18a and preventing rotation of the sub-air chamber member 13, and a communicating hole 13b for communicating the sub-air chamber SC with the tire air chamber, is formed inside the rotation preventive part 18, and the ratio (S2/S1) of the cross-sectional area S2 of the sub-air chamber SC in the projection part 18 to the cross-sectional area S1 of the communicating hole 13b, is set to 5.5 or more. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle wheel that reduces noise associated with air column resonance (cavity resonance) in a tire air chamber.

  In general, it is known that air column resonance generated in a tire air chamber (hereinafter referred to as “tire air chamber”) causes road noise of an automobile. Air column resonance is a phenomenon in which random vibration transmitted from the road surface to the tire vibrates the air in the tire air chamber, and as a result, a resonance phenomenon occurs near the air column resonance frequency of the tire air chamber and a resonance sound is generated. .

Conventionally, a vehicle wheel described in Patent Document 1 is known in order to reduce noise associated with this air column resonance. The vehicle wheel has a plurality of auxiliary air chambers along the circumferential direction of the rim. More specifically, in this vehicle wheel, an annular formed between an annular vertical wall standing on the well portion so as to extend in the circumferential direction of the wheel and a rising side wall of the well portion facing the bead seat portion side. Is covered with a lid member. Each of the sub air chambers is formed by partitioning the space portion, which is partitioned by the lid member, the well portion, and the vertical wall, with a plurality of partition walls arranged at predetermined intervals in the circumferential direction of the wheel. ing. Further, the tire air chamber and each sub air chamber communicate with each other through a communication hole formed in the lid member. According to this vehicle wheel, the communication hole and the auxiliary air chamber constitute a Helmholtz resonator, and air column resonance noise in the tire air chamber can be reduced.
Japanese Patent No. 3992566

  However, the conventional vehicle wheel is not a realistic structure. That is, it is necessary to join a plurality of partition walls and lid members to a wheel formed with a vertical wall so as to stand up from the well portion with high accuracy by welding, bonding, fitting and fastening while maintaining airtightness. In consideration of ensuring the manufacturing cost and the increase in manufacturing man-hours and manufacturing costs, there is a problem that it is not suitable for mass production.

Therefore, the present inventors have previously proposed a vehicle wheel in which a sub air chamber member having a sub air chamber is locked to the vertical wall of the well portion (Japanese Patent Application No. 2007-125139 (unpublished)). The auxiliary air chamber member of the vehicle wheel includes a main body portion having the auxiliary air chamber and an edge portion extending from the main body portion, and the tip of the edge portion is locked to the well portion.
According to this vehicle wheel, unlike a conventional vehicle wheel (for example, see Patent Document 1), a plurality of partition walls and lid members are sequentially assembled to the wheel to form a secondary air chamber. Since the auxiliary air chamber member having the auxiliary air chamber can be manufactured simply by fitting it in the well portion side, the manufacturing man-hours and manufacturing costs can be reduced, and mass productivity can be improved.
The vehicle wheel is formed on the vertical wall by projecting a tubular anti-rotation member that also serves as a communication hole from the auxiliary air chamber member in order to reliably prevent the auxiliary air chamber member from rotating when rotated. It fits into the notch.

  By the way, in the Helmholtz resonator, the resonance frequency of the tire air chamber to be silenced is a function of the volume of the auxiliary air chamber and the length of the communication hole, as will be apparent from the following formula for obtaining the resonance frequency. Can be expressed as On the other hand, since the auxiliary air chamber member is disposed on the well portion, the volume of the auxiliary air chamber is limited to a range in which the tire can be assembled. As a result, the length of the communication hole varies depending on the resonance frequency to be silenced.

  However, if the length of the communication hole is shorter than the length from the main body part of the auxiliary air chamber member to the tip of the edge, in other words, the distance from the main body part to the vertical wall that locks the tip of the edge, The length of the member itself is shortened. As a result, the tip of the rotation preventing member does not reach the vertical wall, and does not function as a rotation stop. Therefore, there is a demand for a vehicle wheel having a Helmholtz resonator that can reliably prevent rotation while accurately tuning the resonance frequency to be silenced by freely adjusting the length of the communication hole.

  Therefore, the present invention can improve the mass productivity as compared with a conventional vehicle wheel equipped with a Helmholtz resonator, and can reliably prevent rotation while accurately tuning the resonance frequency to be silenced. It is an object of the present invention to provide a vehicle wheel that can be used.

  The present invention that has solved the above problems is a vehicle wheel in which the auxiliary air chamber member is fixed on the outer peripheral surface of the well portion in the tire air chamber, rising from the outer peripheral surface of the well portion to the outside in the wheel radial direction, A first vertical wall surface formed so as to extend in the wheel circumferential direction of the outer peripheral surface, and a second vertical wall surface formed in the well portion so as to face the first vertical wall surface, The air chamber member is connected to the bottom plate on the outer peripheral surface side of the well portion and the upper plate that forms a sub air chamber between the bottom plate, the main body portion, and the bottom plate and the upper plate. An edge that extends from the main body portion to the first vertical wall surface and the second vertical wall surface and is engaged with a groove formed on each of the first vertical wall surface and the second vertical wall surface. A projecting portion that partially projects the main body portion toward the first vertical wall surface, A tubular anti-rotation portion that extends from the projecting portion and is locked to the first vertical wall surface to prevent the auxiliary air chamber member from rotating. A communication hole is formed to communicate the air chamber and the tire air chamber, and the ratio (S2 / S1) of the cross-sectional area (S2) of the sub-air chamber in the protrusion to the cross-sectional area (S1) of the communication hole is 5. It is 5 or more.

  In this vehicle wheel, as in a conventional vehicle wheel (see, for example, Patent Document 1), a plurality of partition walls and lid members are sequentially assembled to the wheel, and these are combined with high accuracy while considering airtightness. Unlike what forms the air chamber, the sub air chamber member having the sub air chamber is manufactured in advance by being locked to the well portion side.

  Further, in the vehicle wheel according to the present embodiment, the leading end portion of the rotation preventing portion protrudes further forward by the protruding length of the protruding portion as compared with the one without the protruding portion. Even if the length itself is shorter than the length from the main body to the tip of the edge, the protrusion length of the protrusion is added so that the tip of the rotation stopper is securely engaged with the first vertical wall surface. Stopped.

  Further, in the vehicle wheel according to the present embodiment, the ratio (S2 / S1) of the cross-sectional area (S2) of the auxiliary air chamber in the protrusion to the cross-sectional area (S1) of the communication hole is 5.5 or more. The resonance frequency shift of the auxiliary air chamber member is eliminated as compared with the case without the portion.

  According to the vehicle wheel of the present invention, since the auxiliary air chamber member having the auxiliary air chamber is manufactured by simply locking the auxiliary air chamber member to the well portion side in advance, the manufacturing man-hour and the manufacturing cost are compared with those of the conventional vehicle wheel. Can be reduced, and mass productivity can be improved. Further, according to the vehicle wheel of the present invention, since the protrusion length of the protrusion is added and the distal end of the rotation stopper is reliably locked to the first vertical wall surface, the auxiliary air chamber member is surely Can be prevented. Further, according to the vehicle wheel of the present invention, since the shift of the resonance frequency of the auxiliary air chamber member is eliminated as compared with the case without the protruding portion, the resonance frequency to be silenced can be accurately tuned. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The vehicle wheel according to the present embodiment includes a protrusion partly projecting a main body part of a sub air chamber member in which a sub air chamber is formed, and a tubular detent part extending from the protrusion part. The main feature is that a communication hole for communicating the auxiliary air chamber and the tire air chamber is formed inside the anti-rotation portion.
Here, after first describing the overall configuration of the vehicle wheel, the configuration of the auxiliary air chamber member will be described. In the drawings to be referred to, FIG. 1 is a perspective view of a vehicle wheel according to the present embodiment. FIG. 2 is a front sectional view of a main part of a wheel in which a tire is mounted on the vehicle wheel of FIG. FIG. 3 is a partially enlarged view of the well portion shown in FIG. FIG. 4 is an overall perspective view of the auxiliary air chamber member as seen from the upper plate side. FIG. 5 is a perspective view of the auxiliary air chamber member when viewed from the direction V in FIG.

(Overall configuration of vehicle wheel)
As shown in FIG. 1, the vehicle wheel 10 according to the present embodiment is fixed on a rim 11, a disk 12 for connecting the rim 11 to a hub (not shown), and an outer peripheral surface of a well portion 11 c of the rim 11. The auxiliary air chamber member 13 is mainly configured.

  As shown in FIG. 2, the rim 11 includes bead sheet portions 11 a and 11 a formed at both ends in the wheel width direction Y, and the outside of the bead sheet portions 11 a and 11 a in the wheel radial direction Z (upper side of the drawing in FIG. 2). The rim flange portions 11b and 11b bent toward the same) and the portions between the bead seat portions 11a and 11a are recessed toward the inner side in the wheel radial direction Z (the lower side in FIG. 2, the same applies hereinafter). And a well portion 11c.

  The bead portion 21a of the tire 20 is attached to the bead seat portion 11a. As a result, a tire air chamber MC including an annular sealed space is formed between the outer peripheral surface of the rim 11 and the inner peripheral surface of the tire 20.

The well portion 11 c is provided for dropping the bead portions 21 a and 21 a of the tire 20 when the rim is assembled to the tire 20.
An annular vertical wall 14 is erected on the outer peripheral surface of the well portion 11 c so as to extend in the circumferential direction of the rim 11.
As shown in FIG. 3, the vertical wall 14 forms a first vertical wall surface 15 that rises from the outer peripheral surface 11d of the well portion 11c to the outside in the wheel radial direction Z (upper side of the drawing in FIG. 3, the same applies hereinafter). It is erected on the outer peripheral surface 11d.

  In addition, a second vertical wall surface 16 is formed on the side surface portion 11e formed on the inner side of the well portion 11c in the wheel width direction Y (the right side in FIG. 3, the same applies hereinafter) so as to face the first vertical wall surface 15. Is provided. Note that the vertical wall 14 in the present embodiment is formed integrally with the well portion 11c when the rim 11 (see FIG. 2) is cast.

  A groove portion 17 is formed in each of the first vertical wall surface 15 and the second vertical wall surface 16. These groove portions 17 and 17 are formed along the circumferential direction of the outer peripheral surface 11d of the well portion 11c to form an annular groove. In these grooves 17, 17, distal end portions of edge portions 13 e of the auxiliary air chamber member 13 to be described later are fitted. In addition, the groove parts 17 and 17 in this embodiment are formed by machining each of the vertical wall 14 and the side surface part 11e.

  As shown in FIG. 2, the disk 12 is formed continuously from the outer side in the wheel width direction Y of the well portion 11 c (left side in FIG. 2) to the inner side in the wheel radial direction Z. The rim 11 and the disk 12 are manufactured from a lightweight high-strength material such as an aluminum alloy or a magnesium alloy, for example. These materials are not limited, and may be formed from steel (steel) or the like. The vehicle wheel 10 may be a spoke wheel. And the sub air chamber member 13 demonstrated below is being fixed on the outer peripheral surface of the well part 11c.

(Configuration of auxiliary air chamber member)
As shown in FIG. 4, the auxiliary air chamber member 13 is a member that is long in the wheel circumferential direction X, and includes a main body portion 13 a, an anti-rotation portion 18, and an edge portion 13 e. And the sub air chamber member 13 is curving along the longitudinal direction, and is arrange | positioned so that the outer peripheral surface of the well part 11c may be followed, as shown in FIG. Incidentally, in the vehicle wheel 10 according to the present embodiment, although not shown, four auxiliary air chamber members 13 are arranged at equal intervals along the wheel circumferential direction X of the well portion 11c. That is, two sets of a pair of sub air chamber members 13 that are opposed to each other with the wheel center axis interposed therebetween are arranged.

As shown in FIG. 3, the main body 13a of the auxiliary air chamber member 13 includes a bottom plate 25a and an upper plate 25b disposed on the bottom plate 25a. In addition, although each of the bottom plate 25a and the top plate 25b in this embodiment has the same thickness, these thicknesses may be different from each other.
As will be described later, the bottom plate 25a is integrated with edge portions 13e and 13e extending toward the first vertical wall surface 15 and the second vertical wall surface 16 rising from the well portion 11c in the wheel radial direction Z. A curved surface that is convex inward is formed.

The upper plate 25b is curved to form a bulge on the bottom plate 25a disposed along the outer peripheral surface 11d of the well portion 11c so as to protrude outward in the wheel radial direction Z.
The main body 13a forms a sub air chamber SC described below between the bottom plate 25a and the upper plate 25b.

The auxiliary air chamber SC in the present embodiment has a thin flat shape in the wheel radial direction Z.
The volume of the auxiliary air chamber SC is preferably about 50 to 250 cc. By setting the volume of the sub air chamber SC within this range, the sub air chamber member 13 can sufficiently reduce the weight of the vehicle wheel 10 while suppressing the increase in weight while sufficiently exhibiting the silencing effect. Can do. Further, the length of the auxiliary air chamber member 13 in the wheel circumferential direction is set to the same length as the circumferential length of the rim 11 in consideration of adjustment of the weight of the vehicle wheel 10 and ease of assembly to the well portion 11c. It can be set appropriately.

The anti-rotation portion 18 described above reliably prevents the auxiliary air chamber member 13 from rotating when the vehicle wheel 10 shown in FIG. 1 rotates.
As shown in FIG. 4, the anti-rotation portion 18 protrudes from the main body portion 13 a in a direction intersecting with the wheel circumferential direction X (the rotation direction of the vehicle wheel 10 (see FIG. 1)).
More specifically, as shown in FIGS. 3 and 5, the detent portion 18 has the main body portion 13 a partially on the vertical wall 14 side, in other words, on the first vertical wall surface 15 (see FIG. 3) side. It extends from the protruding portion 18a. That is, the position of the front end portion of the rotation preventing portion 18 is a stepped structure that protrudes further forward by the projection length (R portion) of the projection portion 18a shown in FIG. Become.
As shown in FIG. 5, the shape of the protrusion 18 a in the present embodiment is a substantially rectangular parallelepiped that is thin and flat in the wheel radial direction Z. And the rotation prevention part 18 is extended from the end surface near the vertical wall 14 of the protrusion part 18a.

  The distal end portion of the rotation preventing portion 18 is fitted in a notch portion 14 a formed in the vertical wall 14. In addition, the notch part 14a in this embodiment may be formed by machining the vertical wall 14, or simultaneously with the vertical wall 14 when casting the rim 11 (see FIG. 1). It may be formed.

The anti-rotation portion 18 in the present embodiment is formed of a pipe member, and as shown in FIG. 3, the auxiliary air chamber SC and the tire air chamber MC (see FIG. 2) are connected to the inside of the pipe member. A communication hole 13b is formed.
The cross-sectional shape of the communication hole 13b is not particularly limited and is elliptical (see FIG. 5) in the present embodiment, but may be any of a circular shape, a polygonal shape, and the like.

  The length of the communication hole 13b is set so as to satisfy the expression for obtaining the resonance frequency of the Helmholtz resonator shown in the following (Expression 1).

f ₀ = C / 2π × √ (S1 / V (L + α × √S1)) (Expression 1)
f ₀ (Hz): resonance frequency C (m / s): sound velocity inside the sub-air chamber SC (= sound velocity inside the tire air chamber MC)
V (m ³ ): volume of the auxiliary air chamber SC (however, V includes the volume of the protrusion 18a)
L (m): Length of the communication hole 13b S1 (m ² ): Cross-sectional area of the communication hole 13b α: Correction coefficient The resonance frequency f ₀ is adjusted to the resonance frequency of the tire air chamber MC. At this time, the resonance frequencies f ₀ of the four auxiliary air chamber members 13 may be set to be the same or different. Specifically, when two resonance frequencies (f ₁ , f ₂ ) are recognized as the resonance frequencies of the tire air chamber MC (see FIG. 2), the resonance frequencies f ₀ of the four auxiliary air chamber members 13 are set to (f it can be set to ₁ + _f 2) / 2. Also, setting the resonance frequency f ₀ of the pair of sub air chamber members 13 facing each other across a rim center to f _1, also set the resonant frequency f ₀ of the other pair of sub air chamber members 13 to f ₂ it can. Further, all the resonance frequencies f ₀ of the four sub air chamber members 13 may be set to _one of f ₁ and f ₂ .

  The diameter of the communication hole 13b is preferably 5 mm or more when the cross section is circular. The communication holes 13b having a cross-sectional shape other than a circle preferably have a diameter of 5 mm or more in terms of a cross-sectional area (S1) converted to a circle having the same cross-sectional area (S1).

The ratio (S2 / S1) of the cross-sectional area S2 (see FIG. 5) of the auxiliary air chamber SC in the protrusion 18a to the cross-sectional area S1 (see FIG. 5) of the communication hole 13b is 5.5 or more. FIG. 6 referred to here is a graph showing the relationship between the ratio (S2 / S1) and the shift of the resonance frequency.
In FIG. 6, the ratio (S2 / S1) is referred to as a cross-sectional area ratio (S2 / S1). Further, the resonance frequency shift (Hz) is calculated based on the formula (1) in the sub air chamber member 13 having the protruding portion 18a from the calculated value f ₀ (Hz) of the formula (1) in the sub air chamber member having no protruding portion 18a. ) Is a value obtained by subtracting the calculated value f ₀ (Hz).
As shown in FIG. 6, the auxiliary air chamber member 13 set so that the ratio (S2 / S1) is 5.5 or more has no resonance frequency shift compared to the case without the protrusion 18a. . That is, by setting the ratio (S2 / S1) to 5.5 or more, the influence on the calculated value f ₀ (Hz) of the equation (1) due to the formation of the protruding portion 18a is avoided.

As shown in FIG. 4, the edge portion 13e is formed of a plate-like body extending from the main body portion 13a to the periphery thereof. More specifically, the edge 13e joins the bottom plate 25a and the top plate 25b as shown in FIG. As described above, the edge portion 13e extends from the main body portion 13a in the wheel width direction Y, and the front end portion thereof is fitted into the groove portions 17 of the first vertical wall surface 15 and the second vertical wall surface 16 to be locked. Has been.
The thickness of the edge 13e is set to the same thickness as the bottom plate 25a and the top plate 25b. In addition, the edge part 13e in this embodiment has spring elasticity by selecting the thickness and resin material suitably.

  The auxiliary air chamber member 13 as described above is made of resin, and is lightweight and highly rigid in consideration of weight reduction, mass productivity improvement, reduction of manufacturing cost, ensuring airtightness of the auxiliary air chamber SC, and the like. A blow moldable resin is desirable. Among these, polypropylene that is resistant to repeated bending fatigue is particularly desirable.

Next, the effect of the vehicle wheel 10 according to the present embodiment will be described.
The vehicle wheel 10 according to the present embodiment is assembled with high accuracy while considering airtightness by sequentially assembling a plurality of partition walls and lid members on a rim as in a conventional vehicle wheel (see, for example, Patent Document 1). Unlike the case where the auxiliary air chamber is formed by combining the two, the auxiliary air chamber member 13 having the auxiliary air chamber SC in advance is fitted into the rim 11 (well portion 11c). Therefore, the vehicle wheel 10 can reduce manufacturing man-hours and manufacturing costs, and can improve mass productivity compared with the conventional vehicle wheel like patent document 1 mentioned above. In addition, unlike the conventional vehicle wheel, the vehicle wheel 10 does not require special consideration for ensuring the airtightness of the auxiliary air chamber SC, so that the quality of the silencing performance can be stabilized.

  Since the auxiliary air chamber member 13 is made of resin, the vehicle wheel 10 can be made lighter than a conventional vehicle wheel (see, for example, Patent Document 1). Further, since the auxiliary air chamber member 13 can be formed by blow molding or the like, the vehicle wheel 10 is more excellent in mass productivity than a conventional vehicle wheel (see, for example, Patent Document 1).

  Further, as described above, when the auxiliary air chamber member 13 is fixed to the well portion 11c, the vehicle wheel 10 according to the present embodiment has the edge portion 13e as the first vertical wall surface 15 and the second vertical wall surface 16. It is fixed by being fitted in the groove portion 17 provided in each of the above. At this time, since the edge portion 13e has the spring elasticity described above, the auxiliary air chamber member 13 is easily and firmly fixed between the first vertical wall surface 15 and the second vertical wall surface 16. .

  Further, the vehicle wheel 10 according to the present embodiment can reduce the number of defective products since the resonance frequency can be confirmed and corrected by the auxiliary air chamber member 13 alone before the auxiliary air chamber member 13 is fitted into the rim 11. .

Further, in the vehicle wheel 10 according to the present embodiment, the anti-rotation portion 18 protruding in the direction intersecting with the wheel circumferential direction X is fitted in the notch portion 14a of the vertical wall 14, so that the vehicle wheel 10 is The auxiliary air chamber member 13 is reliably prevented from rotating when rotated.
And since the communication hole 13b is formed inside the rotation prevention part 18, it is not necessary to provide the member for forming the communication hole 13b separately from the rotation prevention part 18, and the vehicle wheel 10 is The structure can be simplified and further weight reduction can be achieved.

  Further, in the vehicle wheel 10 according to the present embodiment, the front end portion of the rotation preventing portion 18 is stretched further forward by the protrusion length (R portion) of the protrusion portion 18a as compared with that without the protrusion portion 18a. Since it has a stepped structure, the length of the rotation stopper 18 (the length of the communication hole 13b) itself is shorter than the length from the main body 13a to the tip of the edge 13e. The projection length (R) is added, and the tip of the rotation stopper 18 is surely fitted into the notch 14a of the vertical wall 14. Therefore, the vehicle wheel 10 can reliably prevent the auxiliary air chamber member 13 from rotating.

  Further, the vehicle wheel 10 according to the present embodiment has a ratio (S2 / S1) of the cross-sectional area (S2) of the protruding portion 18a to the cross-sectional area (S1) of the communication hole 13b is 5.5 or more. Compared with the case without the portion 18a, the resonance frequency shift of the auxiliary air chamber member 13 is eliminated. As a result, the vehicle wheel 10 can accurately tune the resonance frequency to be silenced.

  As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form. Note that, in a vehicle wheel according to another embodiment described below, the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the embodiment, four auxiliary air chamber members 13 are arranged at equal intervals along the peripheral surface of the well portion 11c. However, in the present invention, the number of auxiliary air chamber members 13 is 5 or more, or 3 or less. May be. FIGS. 7A and 7B referred to here are cross-sectional side views of a vehicle wheel according to another embodiment, and are diagrams showing a modification of the arrangement of the auxiliary air chamber members.
In the vehicle wheel 10 shown in FIG. 7A, two auxiliary air chamber members 13 are arranged at equal intervals along the peripheral surface of the well portion 11c.
In the vehicle wheel 10 shown in FIG. 7B, three auxiliary air chamber members 13 are arranged at equal intervals along the peripheral surface of the well portion 11c.

  As described above, the vehicle wheel 10 is not particularly limited in the number of auxiliary air chamber members 13, but considering the noise reduction efficiency, each of the four or more (two or more pairs) auxiliary air chamber members 13 is arranged at the wheel center. It is desirable to arrange them facing each other across the shaft. And considering the weight reduction of the vehicle wheel 10 and the improvement of mass productivity, it is desirable that two to four auxiliary air chamber members 13 are arranged at equal intervals along the peripheral surface of the well portion 11c.

  Moreover, although the said embodiment demonstrated the vehicle wheel 10 which provided the 2nd vertical wall surface 16 in the side part 11e of the well part 11c, this invention is another vertical wall (illustration omitted) provided in the well part 11c. Alternatively, the second vertical wall surface 16 may be formed.

1 is a perspective view of a vehicle wheel according to an embodiment of the present invention. It is principal part front sectional drawing of the wheel which attached the tire to the vehicle wheel of FIG. It is the figure which expanded the well part shown in FIG. 2 partially. It is the whole perspective view which looked at the auxiliary air chamber member from the upper board side. It is the perspective view which looked at the rotation prevention part of the sub air chamber member from the V direction of FIG. It is a graph which shows the relationship between ratio (S2 / S1) of the cross-sectional area (S2) of the sub-air chamber in the protrusion part with respect to the cross-sectional area (S1) of a communicating hole, and the shift | offset | difference of a resonance frequency. (A) And (b) is side sectional drawing of the wheel for vehicles which concerns on other embodiment, Comprising: It is a figure which shows the modification of arrangement | positioning of a sub air chamber member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle wheel 11c Well part 13 Subair chamber member 13a Main body part 13b Communication hole 13e Edge part 14 Vertical wall 14a Notch part 15 1st vertical wall surface 16 2nd vertical wall surface 17 Groove part 18 Anti-rotation part 18a Protrusion part 25a Bottom plate 25b Top plate MC Tire air chamber X Wheel circumferential direction SC Secondary air chamber

Claims (1)

A vehicle wheel in which the auxiliary air chamber member is fixed on the outer peripheral surface of the well portion in the tire air chamber,
A first vertical wall surface formed so as to rise from the outer circumferential surface of the well portion to the outside in the wheel radial direction and extend in the wheel circumferential direction of the outer circumferential surface;
A second vertical wall surface formed in the well portion so as to face the first vertical wall surface;
With
The auxiliary air chamber member is
A main body portion comprising a bottom plate on the outer peripheral surface side of the well portion, and an upper plate forming a sub air chamber between the bottom plate,
The bottom plate and the upper plate are coupled to each other, and extended from the main body portion to the first vertical wall surface and the second vertical wall surface, and the first vertical wall surface and the second vertical wall surface An edge locked to a groove formed in each,
A protruding portion in which the main body portion is partially protruded toward the first vertical wall surface;
A tubular anti-rotation portion that extends from the protrusion and is locked to the first vertical wall surface to prevent the auxiliary air chamber member from rotating,
Have
A communication hole that communicates the auxiliary air chamber and the tire air chamber is formed inside the rotation stopper,
A vehicle wheel, wherein a ratio (S2 / S1) of a cross-sectional area (S2) of the auxiliary air chamber in the projecting portion to a cross-sectional area (S1) of the communication hole is 5.5 or more.

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