JP5091829B2 - Vehicle wheel - Google Patents

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, in order to reduce the noise accompanying this air column resonance, a vehicle wheel described in Patent Document 1 is known. 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 fitted and attached to a well portion (Japanese Patent Application No. 2007-125139 (unpublished)). 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 in advance can be manufactured simply by fitting into the well portion, the number of manufacturing steps and the manufacturing cost can be reduced, and the mass productivity can be improved.
On the other hand, since the reduction of the unsprung weight generally greatly affects the motion performance of the vehicle, further reduction in the weight of the vehicle wheel provided with the auxiliary air chamber member is desired.

  Accordingly, an object of the present invention is to provide a vehicle wheel capable of improving mass production and further reducing weight as compared with a conventional vehicle wheel including a Helmholtz resonator. .

The present invention that has solved the above problems is formed so as to rise from the outer peripheral surface of the well portion to the outer side in the wheel radial direction and extend in the wheel peripheral direction of the outer peripheral surface, and on the outer peripheral surface of the well portion in the tire air chamber. A vertical wall that fixes a sub-air chamber member that is a Helmholtz resonator, and a receiving portion that is formed on the vertical wall that receives a part of the sub-air chamber member and prevents the sub-air chamber member from rotating in the circumferential direction of the wheel. The vertical wall further includes a lightening portion partially thinned in the circumferential direction of the wheel.
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 vertical wall provided in the well portion.
Moreover, since the vehicle wheel has a thinned portion on the vertical wall that fixes the auxiliary air chamber member, the weight of the vertical wall portion is reduced.

  In such a vehicle wheel, the sub air chamber member includes a bottom plate on the outer peripheral surface side of the well portion, an upper plate that forms a sub air chamber between the bottom plate, the sub air chamber, and the tire. A main body portion comprising a communication hole communicating with the air chamber, and the bottom plate and the upper plate are coupled, and extended from the main body portion to the vertical wall side and locked in a groove portion formed in the vertical wall. And an edge to be configured.

  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 vertical wall provided in the well portion, it is manufactured in comparison with the conventional vehicle wheel. Man-hours and manufacturing costs can be reduced, and mass productivity can be improved. And since the weight of a vertical wall part is reduced by the thickness reduction part of a vertical wall, weight reduction can be achieved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The vehicle wheel according to the present embodiment is mainly characterized in that a lightening portion is formed on a vertical wall that fixes the auxiliary air chamber member on the outer peripheral surface of the well portion. Here, the overall structure of the vehicle wheel and the structure of the auxiliary air chamber member will be described first, and then the vertical portion of the vertical wall 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. 5 is a perspective view of the auxiliary air chamber member as seen from the direction V in FIG. FIG. 6 is a view partially showing a cross section (VI-VI cross section) along the circumferential direction of the vertical wall in FIG. 5.

(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 part 17 formed in the vertical wall 14 receives the front-end | tip part of the edge part 13e which is a part of the sub air chamber member 13, and the sub air chamber member 13 rotates in the wheel circumferential direction X (refer FIG. 1). As will be described later, similarly to the notch portion 14a (see FIG. 5) for receiving the rotation preventing projection 18 that is a part of the auxiliary air chamber member 13, the term “ "Accepting part".
Incidentally, 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 11c (the 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, for example, a lightweight high-strength material such as an aluminum alloy or a magnesium alloy. 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, a rotation preventing projection 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 protrusion 18 described above more 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 rotation preventing protrusion 18 protrudes from the main body 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 FIG. 5, the anti-rotation protrusion 18 extends from the root portion 18a in which the upper plate 25b of the main body portion 13a is partially flattened to the vertical wall 14 side.

The tip of the rotation preventing projection 18 is fitted in a notch 14 a formed in the vertical wall 14. The notch portion 14a in the present embodiment is formed by machining the vertical wall 14, but was formed simultaneously with the vertical wall 14 when casting the rim 11 (see FIG. 1). It may be a thing.
In addition, the notch part 14a comprises the "receiving part" said to the claim like the groove part 17 (refer FIG. 3) of the above-mentioned vertical wall 14, and the protrusion part 18 for rotation prevention is a patent. This corresponds to “a part of the auxiliary air chamber member” in the claims.
And in the sub air chamber member 13 in this embodiment, the clearance gaps G and G are formed between the rotation prevention protrusion part 18 and the edge part 13e, and between the root part 18a and the edge part 13e. These gaps G and G make it easy to bend the edge portion 13e between the main body portion 13a and the vertical wall 14 when centrifugal force acts on the main body portion 13a when the vehicle wheel 10 (see FIG. 1) rotates. ing. As a result, the auxiliary air chamber member 13 is fatigued between the rotation preventing projection 18 and the edge 13e, or between the root 18a and the edge 13e, as compared with those without the gaps G and G. It can prevent reliably that a crack arises.

  The anti-rotation protrusion 18 in the present embodiment is formed of a pipe member, and as shown in FIG. 3, a sub air chamber SC and a tire air chamber MC (see FIG. 2) are provided inside the pipe member. The communication hole 13b which connects 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 shape such as a circle or a polygon. The diameter of the communication hole 13b is preferably 5 mm or more when the cross section is circular. Further, the communication hole 13b having a cross-sectional shape other than a circle preferably has a diameter of 5 mm or more in terms of the cross-sectional area converted to a circle having the same cross-sectional area.

  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 × √ (S / V (L + α × √S)) (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 sub-air chamber SC L (m): Length of the communication hole 13b S (m ² ): Cross-sectional area of the opening of the communication hole 13b α: Correction coefficient The resonance frequency f ₀ is The resonance frequency of the tire air chamber MC is adjusted. At this time, the resonance frequencies f ₀ of the four auxiliary air chamber members 13 may be set to be the same or may be 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 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 .

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.

(Meat removal part of vertical wall)
As shown in FIG. 1, the vertical wall 14 that fixes the auxiliary air chamber member 13 is formed with a plurality of lightening portions 19 along the wheel circumferential direction X.
More specifically, as shown in FIG. 6, the lightening portions 19 in the present embodiment are provided on both sides of the notch portion 14a into which the rotation preventing projection 18 is fitted for each sub air chamber member 13 to be fixed. A plurality of thinned portions 19 are formed at a predetermined interval, and the vertical wall 14 has a gear shape. The thickness H of the lightening portion 19 is set to be the same as the height of the vertical wall 14 from the well portion 11c. Further, a draft angle θ that is 5 degrees or more with respect to a mold releasing direction R (see FIG. 8) described later, which is equal to the centrifugal direction R passing through the center of the rotation preventing projection 18, is set in the lightening portion 19. Yes.

  Next, a method for manufacturing the vehicle wheel 10 according to the present embodiment will be described. FIG. 7 referred to here is a schematic diagram of a mold used in the method for manufacturing the vehicle wheel 10 according to the present embodiment. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. Here, a method for manufacturing the vehicle wheel 10 made of an aluminum alloy will be described as an example.

The vehicle wheel 10 according to the present embodiment is manufactured by pouring molten aluminum alloy into a mold described below.
As shown in FIG. 7, the mold 50 is mainly composed of a fixed lower mold 51, an upper mold 52 that is a movable mold, and a side mold 53, and the auxiliary air chamber member 13 is disposed in the mold 50. A cavity 54 simulating the shape of the vehicle wheel 10 excluding (see FIG. 1) is formed.
As shown in FIG. 7, the upper mold 52 is formed with a gate 52 a communicating with the cavity 54. Molten metal is poured into the cavity 54 from the gate 52a. The fixed lower mold 51 is formed with a runway (not shown) that guides excess molten metal from the cavity 54 to a predetermined molten metal reservoir.

As shown in FIG. 8, the side mold 53 is divided into four in the circumferential direction of the vehicle wheel 10, and each side mold 53 has a position corresponding to each auxiliary air chamber member 13 shown in FIG. A plurality of protrusions 53a are formed so as to form the thinned portion 19 of the vertical wall 14.
In addition, since the notch part 14a (refer FIG. 5) in this embodiment is formed by machining as above-mentioned, it corresponds to the protrusion 18 for rotation prevention in the side type | mold 53 in this embodiment. The protruding portion 53a is not formed at the position to be. 8 is an upper mold, 54 is a cavity, and R is a direction in which the side mold 53 is removed.

In this manufacturing method, the molten metal injected into the cavity 54 of the mold 50 shown in FIG. 7 is cooled, so that the shape of the vehicle wheel 10 excluding the auxiliary air chamber member 13 (see FIG. 1) in the cavity 54 is substantially the same. A shaped casting is obtained.
As described above, the draft angle θ shown in FIG. 6 is set to an angle formed with respect to the mold release direction R (see FIG. 8) when the side mold 53 is removed from the casting.
Although not shown in the drawings, in this embodiment, grooves 17 and 17 (see FIG. 3) and a notch 14a (see FIG. 5) are formed in the cast product obtained by demolding by machining. As the air chamber member 13 (see FIG. 3) is assembled as described above, the vehicle wheel 10 (see FIG. 1) is completed.

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. . As described above, the auxiliary air chamber member 13 is prevented from turning in the wheel circumferential direction X (see FIG. 1).

  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. .

  Moreover, since the vehicle wheel 10 which concerns on this embodiment has formed the lightening part 19 in the vertical wall 14 which fixes the sub air chamber member 13, weight reduction can be achieved.

Further, in the vehicle wheel 10 according to the present embodiment, the anti-rotation protrusion 18 that protrudes in the direction intersecting the wheel circumferential direction X is fitted into the notch 14 a of the vertical wall 14. The auxiliary air chamber member 13 is reliably prevented from rotating when the 10 rotates.
Further, since the communication hole 13b is formed inside the rotation preventing projection 18, a member for forming the communication hole 13b separately from the rotation prevention projection 18 may not be provided. The structure of the wheel 10 can be simplified and further weight reduction can be achieved.

  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 above-described embodiment, the vertical wall 14 has a gear shape by providing the plurality of lightening portions 19 at a predetermined interval. However, the present invention provides a secondary air flow due to the centrifugal force acting when the vehicle wheel 10 rotates. As long as the chamber member 13 exhibits a fixing force that does not cause separation, the number, shape, formation position, and the like of the lightening portions 19 can be appropriately changed. FIGS. 9A and 9B referred to here are schematic views showing an aspect of the lightening portion formed on the vertical wall.

As shown in FIG. 9A, in this vehicle wheel 10, the vertical wall 14 has a thinned portion 19 between the sub air chamber members 13 and does not contribute to fixing the sub air chamber members 13. Only meat is cut out.
According to the vehicle wheel 10, the weight can be reduced without changing the fixing force of each auxiliary air chamber member 13 with respect to the vertical wall 14.

As shown in FIG. 9B, in the vehicle wheel 10, the rim 11 (see FIG. 2) is arranged so that the sensor unit 22 of the TPMS (Tire Pressure Monitoring System) faces the tire air chamber MC (see FIG. 2). It is attached. In the vehicle wheel 10, the thinned portion 19 is not formed on the vertical wall 14 on the side facing the wheel center. Moreover, although not shown in figure, you may make it the quantity of the part of the lightening part 19 in this opposing side decreasing. This amount is determined according to the weight of the sensor unit 22 and can be adjusted by the size, shape, quantity, etc., of the lightening portion 19.
According to the vehicle wheel 10, it is possible to achieve a static balance of the vehicle wheel 10 by the portion where the lightening portion 19 is not formed.
In addition, the code | symbol 18 in FIG. 9 (a) and (b) is a protrusion part for rotation prevention.

  Moreover, in the said embodiment, although the thickness reduction part 19 is removed and formed so that the vertical wall 14 may become a gear shape, this invention is the thickness reduction part 19 by the through-hole which pierces the vertical wall 14 in the thickness direction. May be formed.

  Moreover, in the said embodiment, although the thickness reduction part 19 is formed so that the vertical wall 14 may be penetrated in the thickness direction, this invention does not penetrate the thickness reduction part 19 in the thickness direction of the vertical wall 14, but is vertical. The wall 14 may be partially hollowed out.

  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. And the thinning part may be formed in such other vertical walls.

Moreover, in the said embodiment, although the four sub air chamber members 13 are arrange | positioned at equal intervals along the surrounding surface of the well part 11c, the number of the sub air chamber members 13 is 5 or more or 3 or less in this invention. It may be.
In addition, as the number of the sub air chamber members 13, it is desirable that four or more (two or more pairs) of the sub air chamber members 13 are arranged to face each other across the wheel center in consideration of noise reduction efficiency. 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.

  In the embodiment, the communication hole 13b is formed in the middle of the auxiliary air chamber member 13 in the longitudinal direction. However, the present invention forms the communication hole 13b as long as the rim assembly of the tire 20 is not adversely affected. There is no particular restriction on the position. Therefore, the communication hole 13b may be disposed at one end in the longitudinal direction of the sub air chamber member 13, or may be disposed on the upper plate 25b of the sub air chamber member 13. In the present invention, for example, as described above, at least the auxiliary air chamber member 13 is prevented from rotating as in the case where the tip end portion (a part of the auxiliary air chamber member 13) is fitted into the groove portion 17 (receiving portion). If it is performed, the notch part 14a (accepting part) which receives a part of the sub air chamber member 13 does not need to be formed in the vertical wall 14.

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 protrusion for rotation prevention of the sub air chamber member from the V direction of FIG. It is the figure which showed partially the section (VI-VI section) along the peripheral direction of the vertical wall of FIG. It is a schematic diagram of the metal mold | die used with the manufacturing method of the vehicle wheel which concerns on embodiment of this invention. It is VIII-VIII sectional drawing of FIG. (A) And (b) is a schematic diagram which shows the aspect of the lightening part formed in the vertical wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle wheel 11c Well part 13 Subair chamber member 13a Main body part 13e Edge part 14 Vertical wall 14a Notch part 17 Groove part 18 Anti-rotation protrusion part 19 Meat removal part 25a Bottom plate 25b Upper board MC Tire air chamber X Wheel circumferential direction SC Deputy Air Chamber

Claims (2)

A secondary air chamber member that is formed so as to rise from the outer peripheral surface of the well portion in the wheel radial direction and extend in the wheel peripheral direction of the outer peripheral surface and is a Helmholtz resonator on the outer peripheral surface of the well portion in the tire air chamber. A vertical wall to be fixed,
A receiving portion formed on the vertical wall for receiving a part of the auxiliary air chamber member and preventing the auxiliary air chamber member from rotating in the wheel circumferential direction;
A vehicle wheel comprising:
The vehicle wheel according to claim 1, wherein the vertical wall further includes a lightening portion partially thinned in a wheel circumferential direction. The auxiliary air chamber member includes a bottom plate on the outer peripheral surface side of the well portion, an upper plate that forms an auxiliary air chamber between the bottom plate, a communication hole that communicates the auxiliary air chamber and the tire air chamber, A main body comprising:
The bottom plate and the upper plate are combined, and an edge portion that extends from the main body portion to the vertical wall side and is engaged with a groove portion formed in the vertical wall;
The vehicle wheel according to claim 1, comprising:

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