JP4806374B2 - 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 the vehicle wheel, the vehicle wheel is formed between an annular vertical wall standing on the well portion so as to extend in the circumferential direction of the rim and a rising side wall of the well portion facing the bead seat portion. The annular space is closed with a lid member. Each sub air chamber 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. Yes. 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.

  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 applicant has already filed Japanese Patent Application No. 2006-305649 as a vehicle wheel suitable for mass production. The invention according to this application (unpublished) is a vehicle wheel in which a plurality of auxiliary air chamber members formed by crushing both ends of a hollow pipe are arranged and fixed in a well portion along the circumferential direction of the rim. is there. In this vehicle wheel, a communication hole is formed in the auxiliary air chamber member, and the auxiliary air chamber inside the auxiliary air chamber member and the tire air chamber are communicated with each other through the communication hole to constitute a Helmholtz resonator.
Since this vehicle wheel can form a sub air chamber by fixing a sub air chamber member formed of a hollow pipe to the well portion, compared with a conventional vehicle wheel (for example, see Patent Document 1). The structure is realistic and suitable for mass production.
Japanese Patent Laid-Open No. 2004-90669

  However, the vehicle wheel disclosed in Japanese Patent Application No. 2006-305649 newly requires a process of crushing both ends of the hollow pipe in the manufacturing process. Therefore, although this vehicle wheel is suitable for mass production as compared with a conventional vehicle wheel (see, for example, Patent Document 1), further reduction in manufacturing man-hours and manufacturing costs is desired.

In the vehicle wheel disclosed in Japanese Patent Application No. 2006-305649, it is preferable to use a thin hollow pipe in order to reduce the weight. On the other hand, a thick hollow pipe needs to be strong enough to prevent deformation of the auxiliary air chamber when a tool such as a tire lever or a bead drop comes in contact with the tire when changing the tire.
However, with a hollow pipe having a uniform wall thickness, it is difficult to achieve both weight reduction of the vehicle wheel and improvement of the strength of the auxiliary air chamber member.

  Therefore, an object of the present invention is to provide a vehicle wheel that can reduce the number of manufacturing steps and the manufacturing cost, and can achieve both weight reduction and improvement in strength of the auxiliary air chamber member.

The present invention for solving the above problems is a vehicle wheel in which a sub air chamber member constituting a Helmholtz resonator is fixed to a tire air chamber side of the wheel, and the sub air chamber member includes a box and a bottom plate. A sub air chamber formed inside by caulking one of the box body and the bottom plate to the other side, and a communication hole communicating the sub air chamber and the tire air chamber; It is characterized by having.
The vehicle wheel of the present invention is a conventional vehicle wheel (see, for example, Patent Document 1), in which 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 the process of forming the auxiliary air chamber, the auxiliary air chamber member having the auxiliary air chamber is fixed to the wheel in advance.
Therefore, in the vehicle wheel of the present invention, the number of manufacturing steps and the manufacturing cost are reduced as compared with the conventional vehicle wheel.
In the vehicle wheel according to the present invention, the auxiliary air chamber member is formed by a caulking structure of a box and a bottom plate, so that the vehicle wheel provided with the auxiliary air chamber member made of a hollow pipe (Japanese Patent Application No. 2006-305649). Unlike the reference), the step of crushing both ends of the hollow pipe in the manufacturing process to form the auxiliary air chamber member is omitted. As a result, in the vehicle wheel of the present invention, the number of manufacturing steps and the manufacturing cost are reduced as compared with the vehicle wheel provided with the auxiliary air chamber member made of a hollow pipe.
Further, in the vehicle wheel of the present invention, since the auxiliary air chamber member is formed by a caulking structure of a box and a bottom plate, the auxiliary air chamber member is different from an auxiliary air chamber member made of a uniform thick hollow pipe. The thickness of the member can be changed between the box and the bottom plate. As a result, this vehicle wheel can be reduced in weight by setting the thickness of the bottom plate to be thin while improving the strength of the auxiliary air chamber member by setting the thickness of the box to be thick. Become. In such a vehicle wheel, the plate thickness of the box can be made larger than the plate thickness of the bottom plate.

Further, in such a vehicle wheel, a bead may be formed on the wall surface of the box.
In this vehicle wheel, the strength of the box is further improved by the beads formed on the wall of the box.

In such a vehicle wheel, it is desirable that the box and the bottom plate be formed of a plated thin steel plate.
In this vehicle wheel, there is no need to separately apply anti-corrosion coating inside the auxiliary air chamber member, so that the number of manufacturing steps can be further reduced. Further, it is not necessary to use an expensive material such as stainless steel for the auxiliary air chamber member in consideration of rust prevention, so that the manufacturing cost is further reduced. Moreover, in this vehicle wheel, when the sub air chamber member is welded to the wheel, a welding defect caused by the coating film does not occur as compared with the case where the sub air chamber member is coated. Therefore, it is easy to ensure the welding strength.

  According to the vehicle wheel of the present invention, the number of manufacturing steps and the manufacturing cost can be reduced, and the weight reduction and the improvement of the strength of the auxiliary air chamber member can be achieved at the same time.

  Hereinafter, embodiments of a vehicle wheel according to the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a perspective view of a vehicle wheel according to the present embodiment. 2 (a) is a front sectional view of a main part of a wheel in which a tire is mounted on the vehicle wheel of FIG. 1, and FIG. 2 (b) is a partial sectional view of the rim, showing a comparison with a conventional rim. It is.

  The vehicle wheel of the present invention is mainly characterized by including a secondary air chamber member (helmholtz resonator) having a caulking structure composed of two members including a box and a bottom plate. Here, after first describing the overall configuration of the vehicle wheel, the configuration of the auxiliary air chamber member will be described.

  As shown in FIG. 1, a vehicle wheel 10 according to this embodiment includes a rim 11 for mounting a tire 20 (see FIG. 2A), and a disk for connecting the rim 11 to a hub (not shown). 12 and an auxiliary air chamber member 13 fixed to the well portion 11 c of the rim 11.

  As shown in FIG. 2 (a), a rim 11 includes bead sheet portions 11a and 11a formed at both ends in the width direction, and a rim bent in an L shape outward from the bead sheet portions 11a and 11a. It has flange portions 11b and 11b and a well portion 11c that is recessed radially inward between bead sheet portions 11a and 11a.

  The bead portion 21a of the tire 20 is attached to the bead seat portion 11a. As a result, a tire air chamber MC comprising an annular sealed space is formed between the rim 11 and the inner peripheral surface of the tire 20. In addition, regarding the tire 20, the code | symbol 21 shows a tire main body and the code | symbol 22 shows an inner liner.

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.
The well portion 11c is set to make the axial length as wide as possible inside the radial direction of the vehicle wheel 10. Thereby, weight reduction of the rim | limb 11 can be achieved. More specifically, as shown in FIG. 2B, by shifting the rim portion 111c indicated by the dotted line inward in the radial direction to increase the proportion of the well portion 11c, the peripheral length of the shifted portion is increased. As a result, the rim 11 is reduced in weight.

  As shown in FIG. 2A, the disc 12 is formed continuously from the end of the rim 11 on the vehicle outer side in the radial direction. 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.

Next, the auxiliary air chamber member 13 will be described. FIG. 3 referred to here is a side cross-sectional view of the vehicle wheel, and is a view showing an arrangement position of the auxiliary air chamber member. FIG. 4A is a perspective view of the auxiliary air chamber member. FIG.4 (b) is AA sectional drawing of Fig.4 (a). FIG.4 (c) is BB sectional drawing of Fig.4 (a). FIG. 5 is an exploded perspective view of the auxiliary air chamber member.
As shown in FIG. 3, the auxiliary air chamber member 13 is a member that is long in one direction and is arranged along the circumferential direction of the well portion 11c, and has an auxiliary air chamber SC therein. And the four sub air chamber members 13 in this embodiment are arrange | positioned at equal intervals along the surrounding surface of the well part 11c. That is, the vehicle wheel 10 according to the present embodiment includes two sets of a pair of sub air chamber members 13 that face each other with the center of the rim 11 interposed therebetween. These auxiliary air chamber members 13 are spot-welded to the well portion 11c at fixed portions SP1 and SP2 described later.

  Further, as shown in FIG. 2A, the auxiliary air chamber member 13 is disposed in the well portion 11 c on the side (anti-wheel disc surface side) separated from the surface (wheel disc surface) of the disc 12. By arranging the auxiliary air chamber member 13 in this way, the risk of a tool such as a lever inserted from the wheel disc surface side coming into contact with the auxiliary air chamber member 13 when the rim of the tire 20 is assembled is reduced.

  As shown in FIG. 4A, the auxiliary air chamber member 13 is curved in the longitudinal direction so as to follow the peripheral surface of the well portion 11c (see FIG. 3). The auxiliary air chamber member 13 is composed of two members, a box 14 and a bottom plate 15. Incidentally, the box 14 and the bottom plate 15 are formed by pressing a plate material as will be described later.

As shown in FIGS. 4A and 4B, the box body 14 has a bulging portion 14b that forms a sub air chamber SC with the bottom plate 15, and a flat edge formed around the bulging portion 14b. Part 14a.
Moreover, the box 14 is provided with the communication part 14c in the one end side of a longitudinal direction, as shown to Fig.4 (a) and (c). This communication part 14c forms a part of edge part 14a in a semi-cylindrical shape. A communication hole 13 b is formed between the communication portion 14 c and the bottom plate 15 to communicate the sub air chamber SC and the outside of the sub air chamber member 13. In order to set the length of the communication hole 13b to L (m) in (Expression 1) described later, a notch portion 14d is formed in the edge portion 14a.

As shown in FIGS. 4B and 4C, the bottom plate 15 is disposed so as to be in close contact with the edge portion 14 a of the box body 14. It is a board | plate material which forms the communicating hole 13b.
Further, as shown in FIG. 5, the bottom plate 15 in the present embodiment has a caulking allowance 15 a over the entire periphery. In the auxiliary air chamber member 13, as shown in FIGS. 4A to 4C, the caulking allowance 15 a is folded back toward the edge portion 14 a of the box body 14 and caulked. Incidentally, a sealing material may be applied only to the contact portion between the box body 14 and the bottom plate 15, preferably only the caulking portion. As this sealing material, for example, an elastic material such as silicone rubber, or a thin layer material made of an adhesive or a pressure-sensitive adhesive can be used. Such a sealing material can more reliably maintain the airtightness of the sub air chamber SC.

The shape of the auxiliary air chamber SC formed by the box body 14 and the bottom plate 15 is not particularly limited, but is preferably a flat rectangle or semi-elliptical shape in a cross-sectional view. The flat rectangle here includes a so-called saddle shape in which the upper side (the opposite side of the bottom plate 15) is curved.
Incidentally, the auxiliary air chamber member 13 having the auxiliary air chamber SC having a flat cross-sectional shape has a height h1 of the auxiliary air chamber member 13 shown in FIG. 2A while ensuring a predetermined volume of the auxiliary air chamber SC. Can be lowered. As a result, 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 when the rim of the tire 20 is assembled is reduced. It is desirable that the height h1 of the auxiliary air chamber member 13 is set to be equal to or less than the height h2 of the bead sheet portion 11a.

The volume of the sub air chamber SC is preferably about 50 to 100 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.
Then, the length of the communication hole 13b and the cross-sectional area of the opening are set so as to satisfy the equation for obtaining the resonance frequency of the Helmholtz resonator expressed by the following (Equation 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. 3 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, the resonance frequencies f ₀ of the four auxiliary air chamber members 13 are set to (f ₁ + f ₂ ) / 2 can be set. 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.

As shown in FIG. 4B, the plate thickness t1 of the box 14 is thicker than the plate thickness t2 of the bottom plate 15. Incidentally, the plate thickness t1 is preferably set to about 0.5 to 1.6 mm, and the plate thickness t2 is preferably set to about 0.3 mm.
As a board | plate material used for the subair chamber member 13 (box 14 and bottom plate 15), what consists of common metals, such as iron, aluminum, stainless steel, can be used conveniently. Moreover, when this board | plate material consists of a metal which is easy to rust, what performed surface treatments, such as coating and plating, in advance is preferable. Among these, a plated thin steel plate is more preferable.

  Next, a method for manufacturing the vehicle wheel 10 according to the embodiment of the present invention will be described. Fig.6 (a) is process drawing for demonstrating the manufacturing method of the wheel for vehicles which concerns on embodiment of this invention. FIG.6 (b) is process drawing for demonstrating the manufacturing method of the vehicle wheel as a comparative example using the subair chamber member which consists of hollow pipes.

As shown in FIG. 6 (a), in the method for manufacturing the vehicle wheel 10 (see FIG. 1) according to this embodiment, first, an original plate having a predetermined size used for forming the box body 14 and the bottom plate 15 is used. Is cut out from the steel sheet coil (step S1). Next, the original plate is supplied to a press molding machine having a predetermined mold, whereby the box body 14 and the bottom plate 15 shown in FIG. 5 are simultaneously molded (step S2). Incidentally, in this step, the box body 14 and the bottom plate 15 are processed so as to be curved in accordance with the curvature of the peripheral surface of the well portion 11c (see FIG. 3).
And the box 14 and the baseplate 15 are mutually joined by the above-mentioned crimping process (step S3). Through this step, the auxiliary air chamber member 13 shown in FIG.

Next, as described above, the auxiliary air chamber member 13 is fixed by spot welding to the rim 11 (well portion 11c) shown in FIG. 3 (step S4). At this time, as shown in FIG. 4 (a), the fixed portion SP1 and the fixed portion SP2 are set at both ends (the edge portion 14a of the box 14) in the longitudinal direction of the auxiliary air chamber member 13, respectively.
The vehicle wheel 10 according to the present embodiment is completed by applying predetermined coating to the entire wheel including the rim 11 and the disk 12 (step S5).

  Next, a method for manufacturing a vehicle wheel (see Japanese Patent Application No. 2006-305649) as a comparative example using a sub air chamber member made of a hollow pipe will be briefly described. Here, a method of forming the auxiliary air chamber member by separately manufacturing the front half and the rear half in the longitudinal direction of the auxiliary air chamber member and then joining them together will be described.

  As shown in FIG.6 (b), in the manufacturing method of the vehicle wheel which concerns on a comparative example, an element pipe is first manufactured by rounding and welding a thin steel plate (step S11). Next, the hollow pipes corresponding to the front half and the rear half of the auxiliary air chamber member are respectively cut out from the raw tube by a predetermined length (step S12). Each hollow pipe is supplied to a press molding machine having a predetermined mold, so that the hollow pipe is formed flat along the peripheral surface of the well portion 11c (see FIG. 3) and press-formed so as to be curved. (Step S13).

Next, as for each hollow pipe, while an inner mold | type is inserted in the hollow part, one end side is crushed and processed (step S14). And after removing an inner mold | type, a sub air chamber member is produced by joining each hollow pipe (step S15).
Next, the auxiliary air chamber member is fixed by spot welding to the rim 11 (well portion 11c) (step S16). Then, by applying predetermined coating to the entire wheel including the rim 11 and the disk 12 (step S17), the vehicle wheel according to the comparative example is completed.

  Incidentally, in the method for manufacturing the vehicle wheel 10 according to the present embodiment (see FIG. 6A) and the method for manufacturing the vehicle wheel according to the comparative example (see FIG. 6B), steps S1 and S12 Are equivalent steps. Similarly, Step S2 and Step S13, Step S3 and Step S15, Step S4 and Step S16, and Step S5 and Step S17 are equivalent steps.

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 sub air chamber is formed by combining the sub air chambers, the sub air chamber member 13 having the sub air chamber SC is fixed to the rim 11 (well portion 11c) in advance.
Further, the vehicle wheel 10 according to the present embodiment can reduce the number of defective products because the resonance frequency can be confirmed and corrected by the auxiliary air chamber member 13 alone before the auxiliary air chamber member 13 is coupled to the rim 11. .
Therefore, compared with the conventional vehicle wheel, the vehicle wheel 10 according to the present embodiment can reduce manufacturing man-hours and manufacturing costs, and can improve mass productivity.

  Further, the vehicle wheel 10 according to the present embodiment can reduce the number of manufacturing steps and the manufacturing cost even when compared with a vehicle wheel (see Japanese Patent Application No. 2006-305649) provided with a sub air chamber member made of a hollow pipe. And mass productivity can be improved. That is, as shown to Fig.6 (a), the sub-air chamber member 13 in this embodiment is a steel plate coil cutting process (step S1), a press-forming process (step S2), and a crimping process (step S3). It is produced through. On the other hand, as shown in FIG. 6B, the auxiliary air chamber member made of a hollow pipe has a blank tube manufacturing process (step S11), a cutting process (step S12), and a press molding process (step S13). And a crushing process (step S14) and a joining process (step S15). As described above, step S1 and step S12 are equivalent processes. Similarly, step S2 and step S13, and step S3 and step S15 are equivalent processes, respectively. The air chamber member 13 can be manufactured by reducing the steps S11 and S14 from the manufacturing process of the sub air chamber member formed of a hollow pipe. As a result, the vehicle wheel 10 according to the present embodiment can reduce the number of manufacturing steps compared to a vehicle wheel (see Japanese Patent Application No. 2006-305649) provided with a sub-air chamber member made of a hollow pipe. Manufacturing costs can also be reduced.

  Further, the vehicle wheel 10 according to the present embodiment is different from the vehicle wheel (see Japanese Patent Application No. 2006-305649) provided with a sub air chamber member formed of a hollow pipe, and the vehicle wheel 10 is reduced in weight and the sub air chamber. The strength of the member 13 can be improved at the same time. That is, the strength of the sub-air chamber member made of a hollow pipe is reduced when it is a thin hollow pipe in order to reduce the weight. On the other hand, since the vehicle wheel 10 according to the present embodiment includes the auxiliary air chamber member 13 composed of two members of the box body 14 and the bottom plate 15, the thickness of each of the box body 14 and the bottom plate 15 is increased. Can be changed. As a result, the vehicle wheel 10 according to the present embodiment can reduce the weight of the vehicle wheel 10 by setting the bottom plate 15 to be disposed on the well portion 11c side to be thin. And this vehicle wheel 10 sets the thickness of the box 14 which will be arrange | positioned at the tire air chamber MC side thickly, even if a tool contacts even when the tire 20 is rearranged, sub air chamber SC. The strength can be given to such an extent that does not deform.

  Further, the vehicle wheel 10 according to the present embodiment is configured such that the plate thickness t1 of the box body 14 is thicker than the plate thickness t2 of the bottom plate 15, thereby reducing the weight of the vehicle wheel 10 and the strength of the auxiliary air chamber member 13. It is easy to caulk while improving the balance between the two. That is, in the vehicle wheel 10 according to the present embodiment, the caulking allowance 15a side of the plate thickness t2 having a lower strength than the edge portion 14a is folded back to the edge portion 14a side of the box body 14 having the plate thickness t1. The 14 edge portions 14a can be easily caulked without being deformed.

  In addition, the vehicle wheel 10 using the auxiliary air chamber member 13 (the box body 14 and the bottom plate 15) that has been subjected to the above-described surface treatment is provided with a coating for preventing rust in the auxiliary air chamber member 13 separately. Therefore, only the conventional surface coating (cationic electrodeposition coating or the like) performed over the entire wheel after the wheel manufacturing is sufficient, and the number of manufacturing steps can be further reduced. Moreover, since it is not necessary to use expensive materials, such as stainless steel, for the sub air chamber member 13 in consideration of rust prevention, the manufacturing cost can be further reduced. Further, the vehicle wheel 10 using the thin plate steel plate for the auxiliary air chamber member 13 has a coating film when the auxiliary air chamber member 13 is welded to the well portion 11c, as compared with the case where the surface treatment is performed by painting. As a result, there is no welding defect caused by this, so that it is easy to ensure the welding strength.

Further, the vehicle wheel 10 according to the present embodiment can integrally form the bulging portion 14b serving as the auxiliary air chamber SC and the communicating portion 14c serving as the communication hole 13b on the box body 14 side by press molding. The auxiliary air chamber member 13 satisfying the relationship of (Expression 1) can be easily and accurately manufactured.
At this time, the length of the communication hole 13b can be easily changed by adjusting the depth (size) of the notch portion 14d provided in the edge portion 14a on the box body 14 side.

  Further, in the vehicle wheel 10 according to the present embodiment, the caulking allowance 15a of the bottom plate 15 is folded and caulked to the edge portion 14a side of the box body 14, so that the adhesion between the bottom plate 15 and the well portion 11c is caulking allowance 15a. Therefore, the auxiliary air chamber member 13 is more reliably welded to the well portion 11c.

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

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

  As described above, the vehicle wheel 10 is not particularly limited in the number of auxiliary air chamber members 13, but considering the silencing efficiency, each of the four or more (two or more pairs) auxiliary air chamber members 13 is connected to the rim 11. It is desirable to arrange them facing each other across the center. In consideration of weight reduction and productivity improvement of the vehicle wheel 10, 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 auxiliary air chamber member 13 is disposed in the well portion 11c on the side (on the side of the wheel disk surface) separated from the surface of the disk 12 (wheel disk surface). If the well part 11c for dropping the bead parts 21a, 21a of the tire 20 is secured on the surface side of the disk 12 when assembling the rim, the sub air chamber member 13 is arranged in the width direction of the well part 11c. It may be arranged at any position. FIGS. 8A and 8B referred to here are front cross-sectional views of the main part of the rim, and are views showing the positions of the auxiliary air chamber members arranged in the well portion.

In the vehicle wheel 10 shown in FIG. 8A, the auxiliary air chamber member 13 is arranged at the approximate center in the width direction of the well portion 11c.
In the vehicle wheel 10 shown in FIG. 8B, the auxiliary air chamber member 13 is disposed closer to the surface of the disk 12 (wheel disk surface) than the center in the width direction of the well portion 11c.

  Further, in the above embodiment, when the auxiliary air chamber member 13 is fixed to the well portion 11c, the fixing portion SP1 and the fixing portion SP2 of each auxiliary air chamber member 13 are spot welded to the well portion 11c. In the present invention, the method for fixing the auxiliary air chamber member 13 to the well portion 11c is not particularly limited, and may be joining by arc welding, friction stir welding, joining by an adhesive, or joining by a fastener. FIGS. 9A to 9C referred to here are side partial cross-sectional views of the vehicle wheel, and are diagrams schematically showing a modification of the fixing method of the auxiliary air chamber member to the well portion.

  In the fixing method shown in FIG. 9A, the fixing portions SP1 of the sub air chamber members 13 adjacent to each other are overlapped and spot welded to the well portion 11c. The vehicle wheel 10 according to this fixing method can shorten the length occupied by the auxiliary air chamber member 13 in the circumferential length of the well portion 11c by overlapping the fixing portions SP1. That is, the peripheral surface of the well portion 11c can be effectively used according to the length of the sub air chamber member 13 that is reduced. As a result, for example, the capacity of the sub air chamber SC can be increased by further increasing the length of the bulging portion 14b of the sub air chamber member 13 (the length along the circumferential direction of the rim 11).

  In the fixing method shown in FIG. 9B, the fixing portions SP1 of the sub air chamber members 13 adjacent to each other are overlapped and fastened through stud bolts 17a and nuts N provided in the well portion 11c. . The vehicle wheel 10 by this fixing method can fix the auxiliary air chamber member 13 to the well portion 11c without using a dedicated device such as a welding machine.

  In the fixing method shown in FIG. 9C, the fixing portions SP1 of the adjacent auxiliary air chamber members 13 are overlapped with each other, and the head portion 17c of the caulking metal fitting 17b provided in the well portion 11c is caulked and fastened. is there. The vehicle wheel 10 by this fixing method can fix the auxiliary air chamber member 13 to the well portion 11c without using a dedicated device such as a welding machine.

  In the above embodiment, the strength of the auxiliary air chamber member 13 is improved by making the plate thickness t1 of the box body 14 thicker than the plate thickness t2 of the bottom plate 15. The strength of the sub air chamber member 13 may be improved by reinforcing the portion 14b. FIG. 10A referred to here is a plan view of the auxiliary air chamber member in which a bead is formed on the inner wall surface of the bulging portion, FIG. 10B is a cross-sectional view taken along the line C-C in FIG. (C) is sectional drawing of the sub-air chamber member which formed the bead in the outer wall surface of the bulging part, and is a figure corresponding to CC sectional drawing of Fig.10 (a). FIGS. 11A to 11E are plan views of a sub air chamber member showing a modification of the sub air chamber member in which a bead is formed in the bulging portion.

As shown in FIGS. 10A and 10B, the auxiliary air chamber member 13 in another embodiment has a plurality of beads 16 on the inner wall surface (the wall surface on the auxiliary air chamber SC side) of the bulging portion 14b. Is formed. The bead 16 is formed in a rib shape protruding from the inner wall surface. The sub air chamber member 13 shown in FIG. 10A is formed so as to be orthogonal to these two long beads 16 formed along the longitudinal direction of the sub air chamber member 13. Nine short beads 16 are provided.
These beads 16 are formed by subjecting the original plate for the box body 14 cut out from the steel plate coil to press molding or the like and projecting a rib shape on the original plate.

Moreover, this bead 16 may be formed in the outer wall surface of the bulging part 14b, as shown in FIG.10 (c).
Moreover, the arrangement position and the number of the beads 16 in the bulging portion 14b are not particularly limited and can be changed as appropriate.

  The sub air chamber member 13 shown in FIG. 11 (a) is a single long bead 16 in the sub air chamber member 13 shown in FIG. 10 (a). In the auxiliary air chamber member 13 shown in FIG. 11B, the long bead 16 in the auxiliary air chamber member 13 shown in FIG. 10A is omitted. In the auxiliary air chamber member 13 shown in FIG. 11C, the short bead 16 in the auxiliary air chamber member 13 shown in FIG. 10A is omitted, and three long beads 16 are provided. Incidentally, in the auxiliary air chamber member 13 shown in FIGS. 11A to 11C, the number of the long beads 16 and the short beads 16 can be appropriately increased or decreased, and each bead 16 is connected to the outer wall surface of the bulging portion 14b. It may be formed.

The sub air chamber member 13 shown in FIG. 11 (d) forms a plurality of short beads 16 extending obliquely in the width direction (short direction) of the sub air chamber member 13 in the longitudinal direction of the sub air chamber member 13. In addition, a plurality of short beads 16 extending obliquely in the width direction (short direction) with an opposite inclination so as to intersect with these short beads 16 are formed.
Further, the auxiliary air chamber member 13 shown in FIG. 11 (e) has only a bead 16 with one inclination of the auxiliary air chamber member 13 shown in FIG. 11 (d), and the bead 16 with the opposite inclination intersecting the bead 16. Is omitted.

  Further, the auxiliary air chamber member 13 shown in FIGS. 10 (a) to 10 (c) and FIGS. 11 (a) to 11 (e) has a bead 16 formed on both the inner wall surface and the outer wall surface of the bulging portion 14b. There may be.

  The sub air chamber member 13 as described above can further improve the strength of the box body 14 by forming the bead 16 in the bulging portion 14b. As a result, the auxiliary air chamber member 13 can reduce the plate thickness t1 of the box body 14, so that the vehicle wheel 10 can be further reduced in weight.

  Further, the vehicle wheel 10 may be one in which the strength of the box body 14 is improved by performing uneven processing over the entire bulging portion 14 b of the auxiliary air chamber member 13. FIG. 12 is a partially enlarged perspective view of the bulge portion of the auxiliary air chamber member, and shows a state in which the bulge portion has been subjected to uneven processing.

  12 is subjected to PCCP (Pseudo-Cylindrical Concave Polyhedral Shell) processing (diamond cutting processing) as the concavo-convex processing 18. In this PCCP processing, the strength of the box body 14 is improved by forming a truss structure with the concavo-convex broken lines combining triangles.

  In the above embodiment, the communication hole 13b is formed close to one side in the width direction (short direction) of the auxiliary air chamber member 13, but the present invention is at the center in the width direction (short direction). May be. In the above embodiment, the communication hole 13b is formed on one end side in the longitudinal direction of the auxiliary air chamber member 13. However, in the present invention, the communication hole 13b is formed in the middle in the longitudinal direction of the auxiliary air chamber member 13. It may be a thing.

  Further, in the above embodiment, the auxiliary air chamber member 13 is formed by folding the caulking allowance 15a of the bottom plate 15 toward the edge portion 14a of the box body 14 and caulking. As long as the fixing to the well portion 11c is not hindered, the box 14 side may be caulked to the bottom plate 15 side.

It is a perspective view of the wheel for vehicles concerning this embodiment. (A) is front sectional drawing of the principal part of the wheel which attached the tire to the wheel for vehicles of Drawing 1, (b) is a fragmentary sectional view of a rim, and is a figure showing comparison with the conventional rim. It is side surface sectional drawing of the wheel for vehicles, Comprising: It is a figure which shows the arrangement position of a sub air chamber member. (A) is a perspective view of a sub air chamber member, (b) is an AA cross-sectional view of (a), and (c) is a BB cross-sectional view of (a). It is a disassembled perspective view of a sub air chamber member. (A) is process drawing for demonstrating the manufacturing method of the vehicle wheel which concerns on embodiment of this invention, (b) is the vehicle wheel as a comparative example using the sub air chamber member which consists of hollow pipes. It is process drawing for demonstrating a manufacturing method. (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 principal part front sectional drawing of a rim | limb, and is a figure which shows the position of the sub air chamber member arrange | positioned at a well part. (A) to (c) is a side partial sectional view of a vehicle wheel, and is a diagram schematically showing a modification of a method for fixing a sub air chamber member to a well portion. (A) is a plan view of a sub-air chamber member in which a bead is formed on the inner wall surface of the bulging portion, (b) is a sectional view taken along the line CC of (a), and (c) is a bead on the outer wall surface of the bulging portion. It is sectional drawing of the sub-air chamber member which formed A, and is a figure corresponding to CC sectional drawing of (a). (A)-(e) is a top view of the sub air chamber member which shows the modification of the sub air chamber member which formed the bead in the bulging part. It is a partial expansion perspective view of the bulging part of a sub air chamber member, and is a figure which shows a mode that the uneven | corrugated process was given to the bulging part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle wheel 13 Subair chamber member 13b Communication hole 14 Box 15 Bottom plate 16 Bead MC Tire air chamber SC Subair chamber

Claims (4)

A vehicle wheel in which the auxiliary air chamber member constituting the Helmholtz resonator is fixed to the tire air chamber side of the wheel,
The auxiliary air chamber member is
A box and a bottom plate,
A sub-air chamber formed therein by caulking one of the box and the bottom plate to the other side and joining each other;
A communication hole communicating the auxiliary air chamber and the tire air chamber;
The vehicle wheel characterized by having.   The vehicle wheel according to claim 1, wherein a thickness of the box body is greater than a thickness of the bottom plate.   The vehicle wheel according to claim 1, wherein a bead is formed on a wall surface of the box.   The vehicle wheel according to any one of claims 1 to 3, wherein the box body and the bottom plate are formed of a plated thin steel plate.

Images