JP2009248849A - Vehicular wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular wheel enhanced in mass production characteristics. <P>SOLUTION: The vehicular wheel has a sub air chamber member 13 fixed on an outer peripheral surface of a well part within a tire air chamber. The wheel includes: a first vertical wall surface 15 raised up from the outer peripheral surface of the well part toward the outside in a diametrical direction and extended in a peripheral direction of the outer peripheral surface; and a second vertical wall surface 16 formed at the well part in opposition to the first vertical wall surface 15. A sub air chamber SC in the sub air chamber fixed to the first vertical wall surface 15 and the second vertical wall surface 16 through an edge part 13e has its internal space expanded in a wheel width direction Y at both ends of a wheel peripheral direction X, and the length L2 of the edge part 13e at both ends is shorter than the length L1 in the wheel width direction Y of the edge part 13e between both ends. <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, 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 sidewall 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.

  Then, this invention makes it a subject to provide the wheel for vehicles which can improve mass-productivity.

  The present invention that has solved the above problems is a vehicle wheel in which a sub air chamber member is fixed on the outer peripheral surface of a well portion in a tire air chamber, and rises radially outward from the outer peripheral surface of the well portion, A first vertical wall surface formed so as to extend in the circumferential direction of the surface, and a second vertical wall surface formed in the well portion so as to face the first vertical wall surface, and the auxiliary air chamber The member is made of resin, and 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, and a communication hole that communicates the sub air chamber and the tire air chamber. And connecting the bottom plate and the upper plate, and extending from the main body portion to the first vertical wall surface and the second vertical wall surface, the first vertical wall surface and the An edge portion engaged with a groove portion formed on each of the second vertical wall surfaces, The inner space of the chamber is expanded in the wheel width direction at both ends in the circumferential direction of the wheel, and the length in the wheel width direction of the edge at the both ends is the width in the wheel width direction of the edge between the both ends. It is characterized by being shorter than the length.

  According to this vehicle wheel, a plurality of partition walls and lid members are sequentially assembled to the wheel like a conventional vehicle wheel (see, for example, Patent Document 1), and these are combined with high accuracy while considering airtightness. Unlike the process of forming the sub air chamber, the sub air chamber member having the sub air chamber is manufactured by simply fitting it between the first vertical wall surface and the second vertical wall surface provided in the well portion. Is done.

  According to the vehicle wheel of the present invention, since the auxiliary air chamber member having the auxiliary air chamber is manufactured by simply fitting between the first vertical wall surface and the second vertical wall surface provided in the well portion, Compared with the conventional vehicle wheel, it is possible to reduce the number of manufacturing steps and the manufacturing cost, and to improve the mass productivity.

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 sub air chamber member (Helmholtz resonator) is fitted and fixed in the well portion. Here, after first describing the overall configuration of the vehicle wheel, the configuration of the auxiliary air chamber member will be described.

<< Overall configuration of vehicle wheel >>
In the drawings referred to here, 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.

  As shown in FIG. 1, a vehicle wheel 10 according to the present embodiment is fixed to 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 in an L shape toward the same) and the portions between the bead seat portions 11a and 11a are the inner side in the wheel radial direction Z (the lower side in FIG. 2, the same applies hereinafter). And a well portion 11c recessed toward the bottom.

  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 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. The edge portions 13e of the auxiliary air chamber member 13 to be described later are fitted into these groove portions 17 and 17. 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 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.

《Configuration of auxiliary air chamber member》
Next, the auxiliary air chamber member 13 will be described. In the drawings referred to here, FIG. 4 is a side sectional view of the vehicle wheel showing the arrangement position of the auxiliary air chamber member. FIG. 5A is an overall perspective view of the auxiliary air chamber member, and FIG. 5B is a partial plan view of the end of the auxiliary air chamber member as viewed from the Vb direction of FIG. 6A is a perspective view of the protrusion (tube member) of the auxiliary air chamber member as seen from the VIa direction in FIG. 3, and FIG. 6B is a cross-sectional view along VIb-VIb in FIG. 5A. .

As shown in FIG. 4, in the vehicle wheel 10 according to the present embodiment, 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 pairs of the sub air chamber members 13 facing each other with the wheel center axis Ax interposed therebetween are arranged. In FIG. 4, the symbol SC indicates a sub air chamber formed later in the sub air chamber member 13.
As shown in FIG. 5, the auxiliary air chamber member 13 is a member that is long in the wheel circumferential direction X, and includes a main body portion 13a, a protruding portion 18, and an edge portion 13e. And the sub air chamber member 13 is curving along the longitudinal direction, and is arrange | positioned so that the outer peripheral surface 11d of the well part 11c may be followed, as shown in FIG.

(Main body)
As shown in FIG. 3, the main body 13a 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 a curved surface that is integral with the edge portion 13e extending toward the first vertical wall surface 15 and the second vertical wall surface 16 and protrudes toward the outer peripheral surface 11d of the well portion 11c. Is forming.
The upper plate 25b is curved to form a bulge on the bottom plate 25a disposed along the outer peripheral surface 11d side of the well portion 11c so as to protrude outward in the wheel radial direction Z.
Further, as shown in FIG. 5A, the upper plate 25b forms bulges in the wheel width direction Y at both ends in the wheel circumferential direction X.
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 as shown in FIG. Incidentally, in the auxiliary air chamber member 13 in this embodiment, as shown in FIG. 2, the maximum diameter D1 from the rim center is set smaller than the diameter D2 of the bead seat portion 11a from the rim center.
And as shown in FIG.5 (b), the interior space of the sub air chamber SC is expanded by the wheel width direction Y in the edge part of the wheel circumferential direction X. As shown in FIG. Incidentally, in FIG. 5B, only one end portion of the sub air chamber member 13 is shown, but this sub air chamber member 13 has the same structure at the other end portion.

  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.

(Protruding part)
The above-described protrusion 18 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. 5A, the protruding portion 18 protrudes from the main body portion 13a in a direction intersecting with the wheel circumferential direction X (the rotation direction of the vehicle wheel (see FIG. 1)).
More specifically, as shown in FIG. 6A, the protrusion 18 extends from the base 18a of the upper plate 25b of the main body 13a to the vertical wall 14 side.
And the front-end | tip part of the protrusion part 18 is fitted in the notch part 14a formed in the vertical wall 14. As shown in FIG. The notch portion 14a in the present embodiment is formed simultaneously with the vertical wall 14 when the rim 11 (see FIG. 1) is cast, or is formed by machining the vertical wall 14.

  The projecting portion 18 in the present embodiment is formed of a pipe member, and as shown in FIG. 6B, on the inner side of the pipe member, there is a sub air chamber SC and a tire air chamber MC (see FIG. 2). 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. 6A) in the present embodiment, but may be any of a circular shape, a polygonal shape, and the like. 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 sub air chamber members 13 shown in FIG. 4 may all 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 additional air chamber member 13 of a pair of opposite sides of the rim center f _1, setting the resonance frequency f ₀ of the additional air chamber member 13 of the other pair to f ₂ You can also 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 .

(Edge)
As shown in FIG. 5A, 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. And the edge part 13e is extended in the wheel width direction Y from the main-body part 13a, and the front-end | tip part is fitting in the groove part 17 (refer FIG. 3) of the 1st vertical wall surface 15 and the 2nd vertical wall surface 16. As shown in FIG.
In addition, the edge part 13e extended in the wheel width direction Y from the main-body part 13a is corresponded to the "edge part" said to a claim.

  And as shown in FIG.5 (b), the length of the edge part 13e extended from the main-body part 13a to each of the 1st vertical wall surface 15 and the 2nd vertical wall surface 16 is an edge part of the wheel circumferential direction X. Is shorter than the middle length L1 of the wheel circumferential direction X. That is, as described above, the inner space of the auxiliary air chamber SC is expanded in the wheel width direction Y at both ends in the wheel circumferential direction X, so that the wheel width of the edge 13e at both ends in the wheel circumferential direction X is increased. A length L2 in the direction Y is shorter than a length L1 in the wheel width direction Y of the edge 13e between the both end portions. Further, the length L3 of the edge portion 13e extending from the main body portion 13a in the wheel circumferential direction X is preferably as short as possible, and is preferably set to be approximately the same as or shorter than the length L2.

As described above, the edge portion 13e extending to the first vertical wall surface 15 side and the second vertical wall surface 16 side is integral with the curved bottom plate 25a and protrudes toward the outer peripheral surface 11d side of the well portion 11c. A curved surface is formed (see FIG. 3).
In this embodiment, 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 a plurality of partition walls and lid members sequentially on the rim as in a conventional vehicle wheel (for example, see Patent Document 1), and these are highly accurately considered while considering airtightness. Unlike the case where the sub air chambers are formed by combining them, the sub air chamber member 13 having the sub air chamber SC in advance is simply 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).

Moreover, in this vehicle wheel 10, as shown in FIG. 2, the maximum diameter D1 from the rim center is set smaller than the diameter D2 of the bead seat portion 11a from the rim center. Sometimes, the risk that the tool such as a lever or the tire 20 (bead portion 21a or the like) contacts the auxiliary air chamber member 13 is reduced. As a result, the assembly performance of the tire 20 is improved.
Further, in the vehicle wheel 10, as shown in FIG. 3, since the auxiliary air chamber SC has a thin flat shape in the wheel radial direction Z, the maximum diameter D1 of the auxiliary air chamber member 13 is reduced from the center of the rim. However, a predetermined volume of the auxiliary air chamber SC can be ensured.

  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, as described above, in the vehicle wheel 10 according to the present embodiment, the bottom plate 25a and the edge portion 13e of the auxiliary air chamber member 13 shown in FIG. 3 are arranged on the outer peripheral surface 11d side of the well portion 11c (the diameter of the vehicle wheel 10). (Curved inward). And if the centrifugal force at the time of rotation of the vehicle wheel 10 acts on the sub air chamber member 13, the bottom plate 25a and the edge 13e tend to reverse so as to protrude outward in the wheel radial direction Z. FIG. 7A referred to here is a conceptual diagram showing the behavior of the sub air chamber member in the present embodiment in which centrifugal force is applied, and FIG. 7B is a plan view of the sub air chamber member according to the present embodiment. FIG. 7 (c) is a plan view of the auxiliary air chamber member according to the comparative example.

  As shown in FIG. 7A, the auxiliary air chamber member 13 in this embodiment has a centrifugal force greater than the span W1 of the bottom plate 25a and the edge 13e in the auxiliary air chamber member 13 before the centrifugal force F1 acts. The span W2 indicated by the dotted line on which F1 has acted becomes longer.

  On the other hand, as shown in FIG. 3, the edge 13 e of the auxiliary air chamber member 13 is fitted in the grooves 17 and 17 formed in the first vertical wall surface 15 and the second vertical wall surface 16, so that centrifugal force When F1 (see FIG. 7A) acts on the auxiliary air chamber member 13, the pressing force against the first vertical wall surface 15 and the second vertical wall surface 16 is increased. As a result, the auxiliary air chamber member 13 is more reliably fixed to the well portion 11c side.

Further, as described above, the auxiliary air chamber member 13 in the present embodiment is curved so that the upper plate 25b has a bulge on the bottom plate 25a. As a result, in the vehicle wheel 10 provided with the auxiliary air chamber member 13, when the pressure in the tire air chamber MC (see FIG. 2) repeatedly increases and decreases in accordance with the period of air column resonance, for example, the upper plate 25b Compared with a flat thing, the fluctuation | variation of the volume of the sub air chamber SC is suppressed effectively. Therefore, the vehicle wheel 10 can stably exhibit the expected noise reduction performance as a Helmholtz resonator.
And since this sub air chamber member 13 can suppress the fluctuation | variation of the volume of the sub air chamber SC effectively, the thickness of the upper board 25b can be reduced rather than the thing with the flat upper board 25b. . As a result, the vehicle wheel 10 provided with the auxiliary air chamber member 13 can be reduced in weight as compared with a flat upper plate 25b.

Moreover, as shown in FIG.7 (b), since the length L2 of the edge part 13e is shorter than the length L1 of the edge part 13e, the sub air chamber member 13 in this embodiment is a vehicle wheel. It is possible to prevent both end portions in the wheel circumferential direction X from being lifted from the well portion 11c during rotation of 10. This will be described in more detail in comparison with the auxiliary air chamber member 13c according to the next comparative example.
As shown in FIG. 7C, the auxiliary air chamber member 13c according to the comparative example is formed such that the width of the main body 13a in the wheel width direction Y is the same along the wheel circumferential direction X. And length L3 'of the edge part 13e extended in the wheel circumferential direction X from the main-body part 13a is longer than length L3 of the edge part 13e shown in FIG.7 (b). In FIGS. 7B and 7C, reference numerals 15 and 16 denote a first vertical wall surface and a second vertical wall surface for fixing the edge portions 13e and 13e of the auxiliary air chamber members 13 and 13c. Yes.

When the vehicle wheel provided with such a sub air chamber member 13c rotates at an ultra high speed (200 km / h or more in terms of vehicle speed), the sub air chamber member 13c is caused by the generated centrifugal force F1 (see FIG. 7A). It floats from the well portion 11c (see FIG. 1). The amount of lifting was calculated by performing a simulation (wheel rotation speed 2500 rpm). As a result, the amount of lifting at both ends A and A was about twice the amount of lifting at the center B.
And in this sub air chamber member 13c, the edge part 13e fixed to the 1st vertical wall surface 15 and the 2nd vertical wall surface 16 is the corner | angular part, ie, both ends A, at the time of above-mentioned rotation at a super-high speed. It was found that the auxiliary air chamber member 13c was detached from the well portion 11c as it began to come off from the A side.

On the other hand, in the auxiliary air chamber member 13 in the present embodiment shown in FIG. 7B, the length L2 of the edge portion 13e is shorter than the length L1 of the edge portion 13e as described above. Therefore, unlike the auxiliary air chamber member 13c (see FIG. 7C) of the comparative example, the bending rigidity of the edge portion 13e at both end portions A and A, which is likely to be detached during high-speed rotation, is enhanced. As a result, the auxiliary air chamber member 13 has a higher fixing force with respect to the well portion 11c than the auxiliary air chamber member 13c according to the comparative example.
Further, in the auxiliary air chamber member 13 in the present embodiment, the length L3 of the edge portion 13e extending from the main body portion 13a in the wheel circumferential direction X is the length of the edge portion 13e of the auxiliary air chamber member 13c according to the comparative example. Since it is shorter than the length L3 ′, the bending rigidity of the edge portion 13e at both end portions A and A is further enhanced. Therefore, in the sub air chamber member 13 in the embodiment, the fixing force with respect to the well portion 11c is further improved as compared with the sub air chamber member 13c according to the comparative example.

  By the way, when the above-described simulation was performed on the auxiliary air chamber member 13 in the embodiment and the lift amount was calculated, the lift amount at the both ends A and A was about half of the lift amount at the central portion B. there were. Also from this, it was confirmed that the sub air chamber member 13 in the embodiment is more excellent in fixing force with respect to the well portion 11c than the sub air chamber member 13c according to the comparative example.

Moreover, in this vehicle wheel 10, since the protrusion part 18 which protruded in the direction which cross | intersects the wheel circumferential direction X is engage | inserted by the notch part 14a of the vertical wall 14, when the vehicle wheel 10 rotates, it is a subsidiary. The air chamber member 13 is reliably prevented from rotating.
And since the communication hole 13b is formed inside the protrusion part 18, it is not necessary to provide the member for forming the communication hole 13b separately from the protrusion part 18, and the vehicle wheel 10 has the structure. Can be simplified to further reduce the weight.

  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.

As described above, in the vehicle wheel 10 of the present invention, the length L2 in the wheel width direction Y of the edge 13e at both ends in the wheel circumferential direction X is equal to that in the wheel width direction Y of the edge 13e between the both ends. As long as it is shorter than the length L1, there are no particular restrictions on the shapes of the bottom plate 25a and the upper plate 25b that form the auxiliary air chamber SC at the both ends. FIG. 8 referred to here is a diagram showing a modification of the auxiliary air chamber member, and is a perspective view showing an end portion in the wheel circumferential direction.
As shown in FIG. 8, the auxiliary air chamber member 13 has a length L2 in the wheel width direction Y of the edge portion 13e at both ends in the wheel circumferential direction X, as in the above embodiment. The portion 13e is shorter than the length L1 in the wheel width direction Y.
The sub air chamber member 13 has a step S so that the partial shape of the main body 13a at the end in the wheel circumferential direction X is lower than the height at the center in the wheel width direction Y. , S are formed. As a result, at the end portion in the wheel circumferential direction X, a decrease in surface rigidity of this portion due to an increase in the surface area of the main body portion 13a can be prevented by the steps S and S.

  In the above-described embodiment, the vehicle wheel 10 in which the second vertical wall surface 16 is provided on the side surface portion 11e of the well portion 11c has been described. However, the present invention provides the second vertical wall surface 16 at the other rising portion of the well portion 11c. It may be formed. FIG. 9 referred to here is a cross-sectional view of a rim used in a vehicle wheel according to another embodiment.

As shown in FIG. 9, the well portion 11c of the rim 11 used in the vehicle wheel 10 has a small diameter portion 23a and a large diameter portion 23b continuous to the small diameter portion 23a via a step portion 11f. Yes. Incidentally, in the rim 11, a bead sheet portion 11a is formed on the outside of the large diameter portion 23b via the side surface portion 11e of the well portion 11c. That is, in the other embodiment here, the step portion 11f on the inner side in the wheel radial direction further than the side surface portion 11e into which one edge portion 13e of the auxiliary air chamber member 13 (see FIG. 3) is fitted in the above embodiment. The edge 13e will be fitted.
Therefore, in the vehicle wheel 10 according to another embodiment herein, the outer peripheral surface 11d of the well portion 11c that fixes the auxiliary air chamber member 13 is further compared with the vehicle wheel 10 according to the embodiment. It will be formed inside in the radial direction.
As a result, in the vehicle wheel 10 according to the other embodiment, since the circumferential length of the outer peripheral surface 11d of the well portion 11c is shortened, the weight can be further reduced. And in this vehicle wheel 10, compared with the vehicle wheel 10 in the embodiment, the auxiliary air chamber member 13 is further shifted inward in the wheel radial direction so as to be separated from the bead seat portion 11a. Therefore, the assembling performance of the tire 20 is further improved.

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. 12A and 12B referred to here are side cross-sectional views of a vehicle wheel according to another embodiment, and are diagrams showing a modification of the arrangement of the auxiliary air chamber member.
In the vehicle wheel 10 shown in FIG. 12A, 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. 12B, 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. What arrange | positions on both sides of the axis | shaft Ax is desirable. 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. FIGS. 11A and 11B referred to here are plan views of the auxiliary air chamber member showing positions where the communication holes are formed.

  In the auxiliary air chamber member 13 shown in FIG. 11A, a tube member having a communication hole 13b inside is arranged on one end side in the longitudinal direction. This tube member also serves as the above-described detent and is fitted into a notch portion 14a (see FIG. 6A) formed in the vertical wall 14 (see FIG. 6A). And the pipe member protrudes from the main-body part 13a toward the direction which cross | intersects the wheel circumferential direction X. As shown in FIG. In FIG. 11A, reference numeral 13e is an edge.

  The sub air chamber member 13 shown in FIG. 11B is provided with a pipe member having a communication hole 13b on the inner side so as to protrude from the main body portion 13a toward the wheel circumferential direction X on one end side in the longitudinal direction. Yes. And this sub air chamber member 13 is provided with the protrusion part 18 as an above-mentioned rotation stop separately from the above-mentioned pipe member. The projecting portion 18 projects from the edge portion 13 e toward the direction intersecting the wheel circumferential direction X in the middle in the longitudinal direction of the auxiliary air chamber member 13. The protrusion 18 is fitted into a notch 14a (see FIG. 6A) formed in the vertical wall 14 (see FIG. 6A).

It is a perspective view of the wheel for vehicles concerning this embodiment. 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 in FIG. 2 partially. It is side surface sectional drawing of the wheel for vehicles which shows the arrangement position of a sub air chamber member. (A) is the whole perspective view of a sub air chamber member, (b) is the fragmentary top view which looked at the edge part of the sub air chamber member from the Vb direction of (a). (A) is the perspective view which looked at the protrusion part (tube member) of the sub air chamber member from the VIa direction of FIG. 3, (b) is VIb-VIb sectional drawing of Fig.5 (a). (A) is a conceptual diagram which shows the behavior of the sub air chamber member in this embodiment which the centrifugal force acted on, (b) is a top view of the sub air chamber member which concerns on this embodiment, (c) is a comparison It is a top view of the sub air chamber member which concerns on an example. It is a figure which shows the modification of a sub air chamber member, Comprising: It is a perspective view which shows the edge part of a wheel circumferential direction. It is sectional drawing of the rim | limb used for the vehicle wheel which concerns on other embodiment. (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. (A) And (b) is a top view of the sub air chamber member which shows the position which forms a communicating hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle wheel 11c Well part 11d Outer peripheral surface of well part 13 Sub air chamber member 13a Main body part 13e Edge part 14 Vertical wall 15 1st vertical wall surface 16 2nd vertical wall surface 17 Groove part 18 Protrusion part 25a Bottom plate 25b Top plate MC Tire air chamber SC Secondary air chamber X Wheel circumferential direction Y Wheel width direction

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 radially outward from the outer peripheral surface of the well portion and extend in the circumferential direction of the outer peripheral 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
Formed of resin,
A main body comprising: 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; and a communication hole that communicates the sub air chamber and the tire air chamber;
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, respectively, on the first vertical wall surface and the second vertical wall surface. An edge locked in the formed groove,
Have
In the auxiliary air chamber, the inner space is expanded in the wheel width direction at both ends in the wheel circumferential direction, and the length in the wheel width direction of the edge at the both ends is the wheel at the edge between the both ends. A vehicle wheel characterized by being shorter than the length in the width direction.

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