JP2009248870A - Vehicle wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle wheel capable of improving mass production performance. <P>SOLUTION: The vehicle wheel equipped with a sub air chamber member 13 fixed between a first vertical wall surface 15 and a second vertical wall surface 16 formed on a well part 11c is provided with first protrusions 31a and 31b formed on the sub air chamber member 13, and second protrusions 32a and 32b formed on an outer peripheral surface 11d of the well part 11c so as to be abutted to the first protrusions 31a and 31b from the inner side of the first protrusions 31a and 31b. Abutting surfaces of the second protrusions 32a and 32b with respect to the first protrusions 31a and 31b are tilt surfaces 33a and 33b sliding the first protrusions 31a and 31b so as to separate the sub air chamber member 13 from the outer peripheral surface 11d of the well part 11c when a gap between the first protrusions 31a and 31b is narrowed. <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 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.

  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 from the outer peripheral surface of the well portion to the outer side 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 formed 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 that communicates the sub air chamber and the tire air chamber. A main body portion comprising a hole, the bottom plate and the upper plate are coupled, and the first vertical wall surface extends from the main body portion to the first vertical wall surface and the second vertical wall surface. And an edge portion locked to a groove portion formed in each of the second vertical wall surface, A pair of first protrusions are formed apart from each other in the wheel width direction on the outer peripheral surface side of the well portion of the auxiliary air chamber member, and the outer peripheral surface of the well portion includes these A pair of second protrusions are formed so as to contact each of these first protrusions from the inside of the first protrusions, and the second protrusions with respect to the first protrusions. The contact surface is an inclined surface that slides the first protrusion so as to move the auxiliary air chamber member away from the outer peripheral surface of the well portion when the interval between the first protrusions is narrowed. It is characterized by.

  Further, the present invention that has solved the above problem is a vehicle wheel in which a sub air chamber member is fixed on an outer peripheral surface of a well portion in a tire air chamber, and rises outward from the outer peripheral surface of the well portion 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 sub air chamber member is formed of resin, and communicates the sub air chamber and the tire air chamber with 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 the sub 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, Locked in grooves formed in the vertical wall surface and the second vertical wall surface, respectively. A pair of first protrusions that are spaced apart from each other in the wheel width direction on the outer peripheral surface side of the well portion of the auxiliary air chamber member, and the outer peripheral surface of the well portion Are formed with a pair of second protrusions so as to abut against each of the first protrusions from the inside of the first protrusions, and the second protrusions with respect to the second protrusions. The abutment surface of the first protrusion slides with respect to the second protrusion so as to keep the auxiliary air chamber member away from the outer peripheral surface of the well portion when the interval between the first protrusions is narrowed. It is characterized by an inclined surface.

  According to such a vehicle wheel, as in a conventional vehicle wheel (for example, see Patent Document 1), a plurality of partition walls and a lid member are sequentially assembled to the wheel, and these are highly accurately considered in consideration of airtightness. Unlike the case where the sub air chamber is formed by combining them, the sub air chamber member having the sub air chamber is previously fitted between the first vertical wall surface and the second vertical wall surface provided in the well portion. Manufactured by.

  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. 3A is a partially enlarged view of the well portion shown in FIG. 2, and FIG. 3B is a second protrusion disposed on the first vertical wall surface side in FIG. 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. 3A, the vertical wall 14 is a first vertical wall surface 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. 3A, the same applies hereinafter). 15 is erected on the outer peripheral surface 11d.
In addition, 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. 3A, the same shall apply hereinafter) has a second vertical length so as to face the first vertical wall surface 15. A wall surface 16 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. 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. More specifically, the leading end of the edge 13e is locked to a locking surface 17a formed in the grooves 17 and 17 so as to face the outer peripheral surface 11d of the well 11c. 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.

  A pair of second protrusions 32a and 32b are formed on the outer peripheral surface 11d of the well portion 11c so as to be separated from each other in the wheel width direction Y. As will be described later, the second projecting portions 32a and 32b come into contact with the first projecting portions 31a and 31b from the inside of the first projecting portions 31a and 31b of the auxiliary air chamber member 13, respectively. ing.

  Each of the second projecting portions 32a and 32b in the present embodiment is formed in an annular shape extending in parallel with the vertical wall 14 and the side surface portion 11e on the outer peripheral surface 11d of the well portion 11c, and is triangular in a cross-sectional view. Presents. The second projecting portion 32a is formed with an inclined surface 33a facing the first vertical wall surface 15, and the second projecting portion 32b is formed with an inclined surface 33b facing the second vertical wall surface 16. Yes. These inclined surfaces 33a and 33b are contact surfaces of the first projecting portions 31a and 31b of the auxiliary air chamber member 13. As will be described later, these inclined surfaces 33a and 33b have a first protrusion so as to keep the auxiliary air chamber member 13 away from the outer peripheral surface 11d of the well portion 11c when the interval between the first protrusions 31a and 31b is narrowed. The parts 31a and 31b are slid.

  When the first protrusions 31a and 31b slide, the inclined surfaces 33a and 33b are engaged with the locking surfaces of the grooves 17 and 17 from the contact portions of the inclined surfaces 33a and 33b with which the first protrusions 31a and 31b contact. It is desirable that the inclination angle is set so that the distance to 17a is substantially equal to the distance between the tip portions of the edge portions 13e and 13e and the first projecting portions 31a and 31b. In more detail, taking the inclined surface 33a as an example, as shown in FIG. 3B, the inclination angle θ of the inclined surface 33a with respect to the outer peripheral surface 11d of the well portion 11c is related to the tip of the edge portion 13e before and after the slide. The distances L1 and L2 between the locking surface 17a of the groove 17 to be stopped and the contact portion of the inclined surface 33a with which the first protrusion 31a contacts are the distance between the tip of the edge 13e and the first protrusion 31a. It is desirable that the distance is always set to be approximately equal.

  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 as viewed from the upper plate side, and FIG. 5B is an overall perspective view of the auxiliary air chamber member as viewed from the bottom plate side. 6A is a perspective view of the auxiliary air chamber member when viewed from the VIa direction in FIG. 3A, and FIG. 6B is a cross-sectional view taken 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 sets of a pair of 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 FIGS. 5A and 5B, 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 rotation-stopping portion 18, and an edge portion 13e. Yes. 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. 3A, the main body portion 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.
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 the present 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.

  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.

(Non-rotating part)
The above-described anti-rotation portion 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 rotation stopper 18 protrudes from the main body 13a 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. 6 (a), the anti-rotation portion 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.

  And the front-end | tip part of the rotation stop 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 casting the rim 11 (see FIG. 1), or is formed by machining the vertical wall 14. Incidentally, in the auxiliary air chamber member 13 in the present embodiment, gaps G and G are formed between the rotation stop portion 18 and the edge portion 13e and between the root portion 18a and the edge portion 13e. These gaps G and G are intended to be easily fitted when the rotation stopper 18 is fitted into the notch 14a. Further, the 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 sub air chamber member 13 has fatigue cracks between the rotation stop portion 18 and the edge portion 13e, or between the root portion 18a and the edge portion 13e, as compared with the case without the gaps G and G. It can be surely prevented from occurring.

  The anti-rotation portion 18 in the present embodiment is formed of a pipe member. As shown in FIG. 6B, the auxiliary air chamber SC and the 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. 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 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 .

(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 connects the bottom plate 25a and the upper 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 fits into the groove part 17 (refer Fig.3 (a)) of the 1st vertical wall surface 15 and the 2nd vertical wall surface 16. And is locked to the locking surface 17a.
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.

As described above, the edge portion 13e extending toward the first vertical wall surface 15 and the second vertical wall surface 16 is curved so as to be integral with the curved bottom plate 25a and protrude toward the outer peripheral surface 11d side of the well portion 11c. A surface is formed (see FIG. 3A).
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.

And in such a sub air chamber member 13, as shown to Fig.3 (a), a pair of 1st protrusion part 31a, 31b is formed in the outer peripheral surface 11d side of the well part 11c. The first projecting portions 31a and 31b are formed on the outer peripheral surface 11d side of the well portion 11c of the sub air chamber member 13 in the vicinity of the joint portion between the edge portion 13e and the main body portion 13a. That is, the first projecting portions 31a and 31b are formed away from each other in the wheel width direction Y with the main body portion 13a interposed therebetween. And each of 1st protrusion part 31a, 31b in this embodiment is arrange | positioned in the position of equidistance across the center C of the wheel width direction Y of the sub air chamber member 13. As shown in FIG. The first protrusions 31a and 31b have a substantially semicircular shape in cross-sectional view, and as described above, abut against the inclined surfaces 33a and 33b of the second protrusions 32a and 32b, respectively.
Incidentally, the first protrusions 31a and 31b in the present embodiment are formed in a pair of rails extending along the longitudinal direction (wheel circumferential direction X) of the auxiliary air chamber member 13, as shown in FIG. 5 (b). Is formed.

  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. 3A, the auxiliary air chamber SC has a thin flat shape in the wheel radial direction Z. Therefore, the maximum diameter D1 of the auxiliary air chamber member 13 from the rim center. The predetermined volume of the auxiliary air chamber SC can be secured while reducing the size of the auxiliary air chamber SC.

  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, the vehicle wheel 10 according to the present embodiment is curved so that the bottom plate 25a and the edge portion 13e of the auxiliary air chamber member 13 shown in FIG. 3A are convex toward the well portion 11c. ing. 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. 7 referred to here is a conceptual diagram showing the behavior of the auxiliary air chamber member in the present embodiment in which a centrifugal force is applied. FIG. 8A is a partial cross-sectional view showing a state when the auxiliary air chamber member contracts in the vehicle wheel according to the present embodiment, and FIG. 8B is a first vertical view in FIG. 8A. FIG. 8C is a partial cross-sectional view showing a state when the auxiliary air chamber member contracts in the vehicle wheel according to the comparative example. In addition, the dashed-two dotted line in FIG.8 (b) has shown the position of the sub air chamber member before shrinkage | contraction.

  As shown in FIG. 7, the sub air chamber member 13 in the present embodiment has a centrifugal force F1 acting more than the span W1 of the bottom plate 25a and the edge 13e in the sub air chamber member 13 before the centrifugal force F1 acts. The span W2 indicated by the dotted line becomes longer.

  On the other hand, as shown in FIG. 3A, 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. When the centrifugal force F <b> 1 (see FIG. 7) 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.

Further, the auxiliary air chamber member 13 in the present embodiment is formed of resin as described above. Therefore, the sub air chamber member 13 may be deteriorated in the resin, or may be sagged due to the residual stress generated by the tightening due to the first vertical wall surface 15 and the second vertical wall surface 16.
And the sub air chamber member 13 will shorten the length of the wheel width direction Y (refer FIG. 3A), when resin degradation, a sag, etc. arise.

  Even if the auxiliary air chamber member 13 is contracted between the first vertical wall surface 15 and the second vertical wall surface 16 as shown in FIG. It is possible to prevent the auxiliary air chamber member 13 (edge portion 13e) from being detached from 17. This will be described in more detail while comparing with the vehicle wheel according to the following comparative example.

  As illustrated in FIG. 8C, the vehicle wheel 10 ′ according to the comparative example is different from the vehicle wheel 10 according to the present embodiment illustrated in FIG. The protrusions 31a and 31b are not provided, and the second protrusions 32a and 32b are not provided on the outer peripheral surface 11d of the well part 11c. In the vehicle wheel 10 ′, when the auxiliary air chamber member 13 is contracted by a length L 3 and the center thereof is displaced from C ′ to C, the edge portion 13 e is removed from the groove portion 17. As a result, the auxiliary air chamber member 13 is detached from the well portion 11c.

On the other hand, in the vehicle wheel 10 according to the present embodiment shown in FIG. 8A, when the auxiliary air chamber member 13 contracts and the space between the first projecting portions 31a and 31b narrows, FIG. ), The first protrusion 31a indicated by the two-dot chain line slides so as to rise on the inclined surface 33a of the second protrusion 32a. And although not enlarged and shown in figure, the 1st protrusion part 31b shown to Fig.8 (a) slides so that the inclined surface 33b of the 2nd protrusion part 32b may go up. As a result, the auxiliary air chamber member 13 is displaced in a direction away from the outer peripheral surface 11d of the well portion 11c. At this time, even if the sub air chamber member 13 contracts, the center C of the sub air chamber member 13 (see FIG. 8A) is not displaced.
On the other hand, as shown in FIG. 8A, both the front end portions of the edge portions 13e and 13e are displaced toward the center C as the auxiliary air chamber member 13 contracts. However, when the auxiliary air chamber member 13 is displaced in a direction away from the outer peripheral surface 11d of the well portion 11c, the width of the auxiliary air chamber member 13 is changed from the span W1 to the span W2 as shown in FIG. Since the auxiliary air chamber member 13 is contracted, the displacement toward the center C generated at both ends of the edge portions 13e and 13e is canceled out. As a result, the vehicle wheel 10 shown in FIG. 8A can avoid the tip portion of the edge portion 13e from coming off the groove portion 17, so that the auxiliary air chamber member 13 is detached from the well portion 11c. Can be prevented.

Moreover, in this vehicle wheel 10, since the rotation stop part 18 which protruded in the direction which cross | intersects the wheel circumferential direction X is engage | inserted in the notch part 14a of the vertical wall 14, when the vehicle wheel 10 rotates. The auxiliary air chamber member 13 is reliably prevented from rotating.
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.

  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 embodiment, the inclined surfaces 33a and 33b are formed on the second protrusions 32a and 32b provided on the well portion 11c. However, the present invention provides the first protrusions 31a and 31b provided on the auxiliary air chamber member 13 with the inclined surfaces 33a and 33b. The inclined surfaces 33a and 33b may be formed. FIGS. 9A and 9B referred to here are schematic views showing a first protrusion and a second protrusion according to a modification. In addition, since the 1st protrusion part 31a and the 1st protrusion part 31b are right-and-left symmetrical structures here, the 2nd protrusion part 32a and the 2nd protrusion part 32b are right-and-left symmetrical structures, Only the 1st protrusion part 31a and the 2nd protrusion part 32a which are arrange | positioned at the 1st vertical wall surface 15 side are demonstrated, and the description about the 1st protrusion part 31b and the 2nd protrusion part 32b is abbreviate | omitted.

  In the vehicle wheel 10 according to the modification shown in FIG. 9A, an inclined surface 33a is formed on the first projecting portion 31a formed on the auxiliary air chamber member 13, and the well portion 11c is formed on the inclined surface 33a. The second protrusion 32a formed on the outer peripheral surface 11d is in contact. The second projecting portion 32a has a semicircular shape in cross-sectional view. In the vehicle wheel 10, as described above, when the sub air chamber member 13 contracts, the inclined surface 33 a slides with respect to the second projecting portion 32 a, so that the sub air chamber member 13 becomes the well portion 11 c. It is kept away from the outer peripheral surface 11d. As a result, the auxiliary air chamber member 13 is prevented from being detached from the groove portion 17 as in the above embodiment. In addition, the code | symbol 17a in Fig.9 (a) is a latching surface.

  In the vehicle wheel 10 according to the modification shown in FIG. 9B, the second protrusion 32a having an inclined surface is in contact with the inclined surface 33a of the first protrusion 31a. That is, in the vehicle wheel 10, the first protrusion 31 a and the second protrusion 32 a are in contact with each other at the inclined surfaces. In the vehicle wheel 10, as described above, when the sub air chamber member 13 contracts, the inclined surface 33 a slides with respect to the second projecting portion 32 a, so that the sub air chamber member 13 becomes the well portion 11 c. It is kept away from the outer peripheral surface 11d. As a result, the auxiliary air chamber member 13 is prevented from being detached from the groove portion 17 as in the above embodiment. In addition, the code | symbol 17a in FIG.9 (b) is a latching surface.

  Moreover, in the said embodiment, the 1st protrusion parts 31a and 31b are formed in rail shape (refer FIG.5 (b)), and the 2nd protrusion parts 32a and 32b are the 1st vertical wall surface 15 and the 2nd vertical length. Although formed so as to extend in parallel with the wall surface 16, the present invention is not limited as long as the first protrusions 31 a, 31 b and the second protrusions 32 a, 32 b abut as described above. Each of the protrusions 31a and 31b and the second protrusions 32a and 32b may be formed by protrusions that contact each other, and the first protrusions 31a and 31b and the second protrusions. Only one of the portions 32a and 32b may be a protrusion.

  Moreover, in the said embodiment, although inclined surface 33a, 33b is assumed that it is a plane, this invention may be formed so that inclined surface 33a, 33b may have a curved surface.

  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. 10 referred to here is a cross-sectional view of a rim used in a vehicle wheel according to another embodiment.

As shown in FIG. 10, 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 another embodiment here, a step further inward in the wheel radial direction than the side surface portion 11e into which one edge portion 13e of the auxiliary air chamber member 13 (see FIG. 3A) is fitted in the above embodiment. The edge portion 13e is fitted into the portion 11f.
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. 11A and 11B referred to here are side cross-sectional views of a vehicle wheel according to another embodiment, and show a modified example of the arrangement of the auxiliary air chamber members.
In the vehicle wheel 10 shown in FIG. 11A, 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. 11B, 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. 12A and 12B 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. 12A, a pipe member having a communication hole 13b on the inner side 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. 12A, reference numeral 13e is an edge.

  The sub air chamber member 13 shown in FIG. 12B 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 equipped with the rotation stop part 18 as an above-described rotation stop separately from the above-mentioned pipe member. The anti-rotation portion 18 protrudes from the edge portion 13e in the middle of the auxiliary air chamber member 13 in the longitudinal direction in the direction intersecting the wheel circumferential direction X. The anti-rotation part 18 is fitted into a notch part 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. (A) is the figure which expanded the well part shown in FIG. 2 partially, (b) is the elements on larger scale of the 2nd protrusion part arrange | positioned at the 1st vertical wall surface side in (a). It is. 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 which looked at the sub air chamber member from the upper-plate side, (b) is the whole perspective view which looked at the sub-air chamber member from the bottom plate side. (A) is the perspective view which looked at the rotation stop part of the sub air chamber member from the VIa direction of Fig.3 (a), (b) is VIb-VIb sectional drawing of Fig.5 (a). It is a conceptual diagram which shows the behavior of the sub air chamber member in this embodiment with which the centrifugal force acted. (A) is a fragmentary sectional view which shows a mode when the sub air chamber member shrink | contracts in the vehicle wheel which concerns on this embodiment, (b) shows the mode of the 1st vertical wall surface vicinity in (a). Partial enlarged view, (c) is a partial cross-sectional view showing a state when the auxiliary air chamber member contracts in the vehicle wheel according to the comparative example. (A) And (b) is a schematic diagram which shows the 1st protrusion part and 2nd protrusion part which concern on a modification. 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 13e Edge part 13 Sub air chamber member 15 1st vertical wall surface 16 2nd vertical wall surface 17 Groove part 13a Main body part 25a Bottom plate 25b Upper plate X Wheel circumferential direction Y Wheel width Direction Z Wheel radial direction MC Tire air chamber SC Secondary air chamber

Claims (2)

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
Formed of resin,
A main body comprising a bottom plate on the outer peripheral surface side of the well portion, an upper plate forming a sub air chamber between the bottom plate, and a communication hole communicating 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, and the first vertical wall surface and the second vertical wall surface An edge locked to a groove formed in each,
Have
A pair of first protrusions are formed apart from each other in the wheel width direction on the outer peripheral surface side of the well portion of the auxiliary air chamber member, and these first protrusions are formed on the outer peripheral surface of the well portion. A pair of second protrusions are formed so as to abut against each of these first protrusions from the inside of the protrusions,
The contact surface of the second projecting portion with respect to the first projecting portion is configured to move the sub air chamber member away from the outer peripheral surface of the well portion when the interval between the first projecting portions is narrowed. A vehicle wheel characterized in that the vehicle wheel has an inclined surface on which one projecting portion slides. 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
Formed of resin,
A main body comprising a bottom plate on the outer peripheral surface side of the well portion, an upper plate forming a sub air chamber between the bottom plate, and a communication hole communicating 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, and the first vertical wall surface and the second vertical wall surface An edge locked to a groove formed in each,
Have
A pair of first protrusions are formed apart from each other in the wheel width direction on the outer peripheral surface side of the well portion of the auxiliary air chamber member, and these first protrusions are formed on the outer peripheral surface of the well portion. A pair of second protrusions are formed so as to contact each of these first protrusions from the inside of the protrusions,
The contact surface of the first protrusion with respect to the second protrusion is such that the sub-air chamber member is moved away from the outer peripheral surface of the well portion when the distance between the first protrusions is reduced. A vehicle wheel characterized in that the vehicle wheel has an inclined surface that slides relative to the two protrusions.

Images