JP2008120222A - Vehicular wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular wheel capable of securing the predetermined length of a communicating hole and a cross-sectional area of an opening in a sub air chamber member and enhancing mass productivity. <P>SOLUTION: In this vehicular wheel 10, the sub air chamber member 13 is fixed to the tire air chamber MC side of the wheel. The sub air chamber member 13 formed by processing a hollow pipe includes a sub air chamber SC formed inside both ends of the hollow pipe processed in a collapsing manner; and the communicating hole 13b for making the sub air chamber SC communicate with the tire air chamber MC. The communicating hole 13b is formed at a portion of a point processed in a collapsing manner. On the outside end of the point, one end is opened to the tire air chamber MC, while the other end has a hollow opened to the sub air chamber SC. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

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

  Conventionally, a vehicle wheel described in Patent Document 1 is known in order to reduce noise associated with this air column resonance. In this vehicle wheel, a lid member is arranged along the circumferential direction of the rim, a partition is provided inside the lid member, and a plurality of auxiliary air chambers are formed in the circumferential direction between the rim and the lid member. 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. In other words, it is necessary to connect a retrofitting member of a complicated plate assembly, which is a lid member provided with a partition wall, to a normal wheel by welding, bonding, fitting, and fastening while maintaining airtightness, ensuring airtightness and manufacturing man-hours. Considering the increase in manufacturing cost, there is a problem that it is not suitable for mass production.

Therefore, the present applicant has already filed Japanese Patent Application No. 2006-202837 as a vehicle wheel suitable for mass productivity. The invention (unpublished) according to this application is a vehicle wheel in which a sub air chamber member formed by crushing both ends of a hollow pipe is fixed to the wheel. 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.
International Publication No. 03/029028

  However, at the time of filing of Japanese Patent Application No. 2006-202837, the present applicant did not particularly describe the optimum form of the communication hole of the auxiliary air chamber member. Therefore, there was a point to be improved regarding the form of the communication hole.

  Specifically, the communication hole of the above-mentioned application was merely drilled in the auxiliary air chamber member for weight reduction and cost reduction, and the length (neck length) of the communication hole was only the wall thickness. Therefore, if the cross-sectional area of the opening of the communication hole is tuned according to the length, a sufficient cross-sectional area of the opening cannot be obtained, the communication between the sub air chamber and the tire air chamber becomes insufficient, and the sound deadening performance cannot be sufficiently exhibited. was there.

  Then, this invention makes it a subject to provide the vehicle wheel which can ensure the predetermined length and opening cross-sectional area of the communicating hole of a sub air chamber member, and can improve mass productivity.

  In order to solve the above problem, the invention according to claim 1 is a vehicle wheel in which a sub air chamber member is fixed to a tire air chamber side of the wheel, and the sub air chamber member is formed by processing a hollow pipe. The sub-air chamber formed inside by crushing both ends of the hollow pipe, and a communication hole that communicates the sub-air chamber and the tire air chamber, The communication hole is provided in a part of the crushed portion, and is formed by a cavity having one end opened to the tire air chamber and the other end opened to the sub air chamber at an outer end portion of the portion. It is characterized by being.

According to the first aspect of the present invention, it is possible to easily form an airtight sub-air chamber by crushing both ends of the hollow pipe. Further, since the communication hole is a cavity provided in a part of the crushed portion, the communication hole can be increased by the length of the crushed portion, and the wall thickness of the auxiliary air chamber member (the wall of the hollow pipe) A predetermined length of (thickness) or more can be ensured. Thereby, a predetermined opening cross-sectional area can also be secured. Further, the communication hole is formed at the end of the auxiliary air chamber member (the end of the hollow pipe) and does not protrude in the direction perpendicular to the rim. The cross sectional area can be increased in size. Further, by crushing the hollow pipe, the communication hole is formed at the same time as the formation of the sub-air chamber, so that the number of man-hours can be reduced as compared with the conventional case.
And since it is not necessary to consider airtightness at the time of coupling | bonding a sub air chamber member and a wheel, it becomes unnecessary to use the highly accurate coupling method with a complicated board assembly and high airtightness like the prior art.
Further, since the resonance frequency can be confirmed and corrected by the auxiliary air chamber member alone before the auxiliary air chamber member is coupled to the wheel, defective products can be reduced.
Thereby, the increase in the manufacturing man-hour and the manufacturing cost which had arisen in the prior art can be suppressed, and mass productivity can be improved.
The “predetermined length” is a length equal to or greater than the wall thickness of the hollow pipe, and is appropriately set according to an equation for obtaining the resonance frequency of the resonator in the embodiment described later.

  The invention according to claim 2 is a vehicle wheel in which a sub air chamber member is fixed to a tire air chamber side of the wheel, and the sub air chamber member is formed by processing a hollow pipe, and the hollow pipe A sub air chamber formed inside the hollow pipe by attaching a lid member thicker than a wall thickness of the hollow pipe to the opening of the other end, A communication hole that communicates with the tire air chamber, and the communication hole is formed in the lid member.

According to the second aspect of the present invention, it is possible to easily form an airtight auxiliary air chamber by crushing one end of the hollow pipe and attaching a lid member to the opening at the other end. it can. Further, since the communication hole is provided in the thick lid member, a predetermined length equal to or greater than the wall thickness of the auxiliary air chamber member (wall thickness of the hollow pipe) can be secured. Thereby, a predetermined opening cross-sectional area can also be secured. Further, the communication hole is formed in the lid member attached to the other end of the hollow pipe, and does not protrude in a direction perpendicular to the peripheral surface of the rim. The cross sectional area can be increased in size.
And since it is not necessary to consider airtightness at the time of coupling | bonding a sub air chamber member and a wheel, it becomes unnecessary to use the highly accurate coupling method with a complicated board assembly and high airtightness like the prior art.
Further, since the resonance frequency can be confirmed and corrected by the auxiliary air chamber member alone before the auxiliary air chamber member is coupled to the wheel, defective products can be reduced.
Thereby, the increase in the manufacturing man-hour and the manufacturing cost which had arisen in the prior art can be suppressed, and mass productivity can be improved.
The “predetermined length” is a length equal to or greater than the wall thickness of the hollow pipe, and is appropriately set according to an equation for obtaining the resonance frequency of the resonator in the embodiment described later.

  The invention according to claim 3 is a vehicle wheel in which a sub air chamber member is fixed to a tire air chamber side of the wheel, and the sub air chamber member is formed by processing a hollow pipe, and the hollow pipe The auxiliary air chamber is formed by crushing both ends of the auxiliary air chamber, and a communication hole that communicates the auxiliary air chamber with the tire air chamber. It is comprised by the communicating pipe attached to the wall part of the air chamber member.

According to the third aspect of the present invention, it is possible to easily form an airtight sub-air chamber by crushing both ends of the hollow pipe. Further, since the communication hole is constituted by a communication pipe attached to the wall portion of the auxiliary air chamber member, it is possible to ensure a predetermined length equal to or greater than the wall thickness of the auxiliary air chamber member (wall thickness of the hollow pipe). it can. Thereby, a predetermined opening cross-sectional area can also be secured.
And since it is not necessary to consider airtightness at the time of coupling | bonding a sub air chamber member and a wheel, it becomes unnecessary to use the highly accurate coupling method with a complicated board assembly and airtightness like the prior art.
Further, since the resonance frequency can be confirmed and corrected by the auxiliary air chamber member alone before the auxiliary air chamber member is coupled to the wheel, defective products can be reduced.
Thereby, the increase in the manufacturing man-hour and the manufacturing cost which had arisen in the prior art can be suppressed, and mass productivity can be improved.
The “predetermined length” is a length equal to or greater than the wall thickness of the hollow pipe, and is appropriately set according to an equation for obtaining the resonance frequency of the resonator in the embodiment described later.

  According to a fourth aspect of the present invention, in the vehicle wheel according to the third aspect, the wall portion is a vertical wall portion adjacent to the crushed portion.

  According to the invention of claim 4, the wall portion to which the communication pipe is attached is a vertical wall portion adjacent to the crushed portion, and the communication pipe is attached so as not to protrude in a direction perpendicular to the peripheral surface of the rim. Therefore, it is possible to increase the length of the neck and increase the cross-sectional area of the opening without hindering the tire assembly.

According to the vehicle wheel of the present invention, the communication hole of the auxiliary air chamber member ensures a predetermined length and a predetermined opening cross-sectional area equal to or greater than the wall thickness of the auxiliary air chamber member (wall thickness of the hollow pipe). Can do. Thereby, the silencing effect which makes the best use of the sub air chamber capacity can be exhibited.
Moreover, when attaching a sub air chamber member to a wheel, since it is not necessary to use a highly accurate coupling method, the increase in a manufacturing man-hour and manufacturing cost can be suppressed. Thereby, mass productivity can be improved.

[First Embodiment]
Hereinafter, a first embodiment 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. FIG. 2 is a front sectional view of a principal part of a wheel in which a tire is mounted on the vehicle wheel of FIG.

  As shown in FIG. 1, a vehicle wheel 10 according to the present embodiment includes a rim 11 for mounting a tire 20 (see FIG. 2), a disk 12 for connecting the rim 11 to a hub (not shown), The auxiliary air chamber member 13 is provided on the rim 11.

  As shown in FIG. 2, the rim 11 includes bead sheet portions 11a and 11a formed at both end portions in the width direction, and a rim flange portion 11b bent in an L shape outward from the bead sheet portions 11a and 11a. 11b and a well portion 11c that is recessed radially inward between the 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. A sub air chamber member 13 to be described later is attached to the well portion 11c on the side away from the surface of the disk 12 (wheel disk surface). By arranging the auxiliary air chamber member 13 in this way, deformation and damage of the auxiliary air chamber member 13 during rim assembly can be prevented. The well portion 11c is made as wide as possible in the axial direction of the disk 12. Thereby, weight reduction of the rim | limb 11 can be achieved. The weight is reduced because, in the rim 11, the proportion of the bead sheet portion 11a located on the radially outer side becomes relatively small by increasing the proportion of the well portion 11c located on the radially inner side. is there.

  The disk 12 is continuously formed radially inward from the vehicle outer end of the rim 11. The rim 11 and the disk 12 are manufactured from a lightweight high-strength material such as an aluminum alloy or a magnesium alloy, for example. These materials are not limited, and may be formed from steel (steel) or the like. The vehicle wheel 10 may be a spoke wheel.

  FIG. 3A is a perspective view showing a hollow pipe (sub-air chamber member before processing), and FIG. 3B is a perspective view showing the sub-air chamber member. FIG. 4 is a side sectional view of the vehicle wheel to which the auxiliary air chamber member is attached.

As shown in FIG. 3B, the auxiliary air chamber member 13 is a hollow member formed in a curved shape along the peripheral surface of the well portion 11c (see FIG. 2) as a whole. The auxiliary air chamber member 13 has an auxiliary air chamber SC formed therein, flange portions 13a and 13a formed at both ends, and a communication hole 13b formed in a part of one flange portion 13a. is doing. The volume of the auxiliary air chamber SC is designed to be about 20 to 300 cc. The communication hole 13b is provided close to one side in the width direction of the flange portion 13a. As shown in FIG. 4, one end opens to the tire air chamber MC and the other end opens to the sub air chamber SC. The cavity has a predetermined length (for example, 1 to 30 mm) and a predetermined opening cross-sectional area (for example, 1 to 200 mm ² ). The predetermined length is substantially the same as the length of the flange portion 13a in which the communication hole 13b is formed, and is appropriately set according to an equation (Equation 1) for obtaining the resonance frequency of the resonator described later.

  The auxiliary air chamber member 13 is formed by processing (press integral molding) a circular hollow pipe P shown in FIG. Here, the hollow pipe P is not particularly limited, but it is preferable to use a thin pipe having a wall thickness of about 0.3 to 1.6 mm. Thereby, weight reduction can be achieved. The length of the hollow pipe P is about ¼ of the circumference of the well portion 11c. Furthermore, as a material of the hollow pipe P, a general metal material such as iron, aluminum alloy, stainless steel, a thermoplastic resin, other plastics, or the like can be used. For example, when a metal material that is vulnerable to rust is used as the material of the hollow pipe P, it is preferable to perform a surface treatment in advance before formation.

  The auxiliary air chamber member 13 shown in FIG. 3B has a cylindrical jig (not shown) for the communication hole 13b at one end of such a hollow pipe P (see FIG. 3A). In the inserted state, the end portions Pa, Pa in the length direction are crushed and formed as a whole along the peripheral surface of the well portion 11c (see FIG. 2). That is, by crushing the hollow pipe P, the end portions Pa and Pa become the flange portions 13a and 13a. Further, the communication hole 13b is formed with a predetermined length and an opening cross-sectional area by a jig. At the same time, a sub-air chamber SC is formed inside. By this processing, the communication hole 13b and the auxiliary air chamber SC are formed at the same time, and it is not necessary to form the communication hole 13b with a cutting tool such as a drill or a punching tool, so that the number of man-hours can be reduced.

  As shown in FIG. 4, the auxiliary air chamber member 13 is spot welded between the flange portions 13 a and 13 a and the well portion 11 c in the portions S <b> 1 and S <b> 2 on the flange portions 13 a and 13 a (see also FIG. 3B). It is fixed to the rim 11 by performing two spot welding. In addition, the joining method of the sub air chamber member 13 is not limited to spot welding, but other general industries such as arc welding and other welding, friction stir welding, joining with an adhesive, fastening with bolts and nuts, caulking, etc. Product binding methods can be used. Four such auxiliary air chamber members 13 are attached along the circumferential direction of the well portion 11 c of the rim 11. Thus, four auxiliary air chambers SC are formed in the vehicle wheel 10. The number of sub air chambers SC may be three or less, but is preferably four or more in order to improve the silencing efficiency. By attaching the auxiliary air chamber member 13 in this way, the auxiliary air chamber SC and the tire air chamber MC communicate with each other through the communication hole 13b.

  The auxiliary air chamber SC and the communication hole 13b described above constitute a Helmholtz resonator. The following (Expression 1) is an expression for obtaining the resonance frequency of this resonator.

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 auxiliary 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

By adjusting the resonance frequency f ₀ obtained by (Equation 1) to the resonance frequency of the tire air chamber MC, the resonance sound generated in the tire air chamber MC can be reduced. In order to match this resonance frequency f ₀ , the length L of the communication hole 13b, the sectional area S of the opening of the communication hole 13b, and the volume V of the auxiliary air chamber SC are appropriately set.

According to the above, in the present embodiment, the following effects can be obtained.
In the present embodiment, by crushing the ends Pa and Pa of the hollow pipe P, the airtight sub-air chamber SC can be easily formed.

  In the present embodiment, the communication hole 13b is a cavity provided in a part of the flange portion 13a that is a portion subjected to the crushing process. Therefore, the communication hole 13b can be increased by the length of the portion subjected to the crushing process. A predetermined length equal to or greater than the wall thickness of the member 13 can be ensured. In accordance with this, a predetermined opening cross-sectional area can be secured. Therefore, the silencing effect that makes the best use of the auxiliary air chamber capacity can be exhibited. Further, the communication hole 13b is formed in the flange portion 13a of the auxiliary air chamber member 13, and does not protrude in a direction orthogonal to the peripheral surface of the rim 11, so that the large neck length can be increased and the opening can be prevented without hindering the tire assembly. The cross sectional area can be increased in size. And since the communication hole 13b is provided in the edge part of the sub air chamber member 13, and the distance to the opening part of the communication hole 13b and the opposing wall in the sub air chamber SC is ensured long, it is based on the influence of reflection of air. Reduction of the silencing effect can be prevented.

  In the present embodiment, when the auxiliary air chamber member 13 is manufactured, the communication hole 13b and the auxiliary air chamber SC are simultaneously formed by crushing the end portion Pa of the hollow pipe P. Therefore, the number of man-hours can be reduced as compared with the prior art. can do. Further, since the communication hole 13b is not formed as a separate member but is formed integrally with the auxiliary air chamber member 13, it is not necessary to fix the separate member to the auxiliary air chamber member, thereby improving productivity. , Increase in the number of parts, manufacturing cost and weight can be minimized.

  In this embodiment, when attaching the sub air chamber member 13 to the rim | limb 11, it is not necessary to use a highly accurate coupling method, Therefore The increase in a manufacturing man-hour and manufacturing cost can be suppressed. Thereby, mass productivity can be improved.

  As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form.

  In the embodiment, the communication hole 13b having a circular cross section is formed, but the shape of the communication hole 13b is not limited and can be formed in various shapes such as a square, an ellipse, and a polygon.

  Further, the present invention can be modified as follows. FIG. 5A is an enlarged perspective view of a main part of a sub air chamber member according to Modification 1 of the first embodiment, and FIG. 5B is a main part of the sub air chamber member according to Modification 2 of the first embodiment. An enlarged perspective view and (c) are principal part enlarged perspective views of a sub air chamber member according to Modification 3 of the first embodiment.

  In the embodiment, the communication hole 13b is formed close to one side in the width direction of the flange portion 13a (see FIG. 3B), but the position of the communication hole 13b is not limited. For example, as shown in FIG. 5A, in the auxiliary air chamber member 13A, the communication hole 13b 'may be formed at the center in the width direction of the flange portion 13a. In this case, spot welding can be performed on the rim 11 at the portions S2 'on both sides in the width direction of the flange portion 13a. Further, the communication hole 13b may be formed close to the width direction opposite side of the first embodiment.

  In the embodiment, when the end portion Pa (see FIG. 3A) of the hollow pipe P is crushed, the communication hole 13b is formed with a jig (not shown). Holes can also be formed.

  For example, as shown in FIG. 5B, when the auxiliary air chamber member 13B is manufactured, the communication pipe 14B, which is a separate member, is inserted into one end Pa (see FIG. 3A) of the hollow pipe P. Alternatively, the communication hole by the communication pipe 14B may be formed by crushing in this state.

  For example, as shown in FIG. 5C, when the auxiliary air chamber member 13c is manufactured, a U-shaped plate 14C having a groove D at the center may be used instead of the communication pipe 14B. That is, while the end portion Pa (see FIG. 3A) of the hollow pipe P is crushed, the U-shaped plate 14C is inserted into the opening, and the communication hole is formed by the groove D of the U-shaped plate 14C. Good. In this case, spot welding can be performed on the rim 11 at the portions S2 ″ on both sides of the groove D.

  According to these modified examples, in addition to the same effects as those of the first embodiment, it is possible to omit the trouble of removing the jig and the like, and the length of the communication hole and the communication pipe 14B and the U-shaped plate 14C Since the opening cross-sectional area can be easily set, frequency tuning can be facilitated. The material of the communication pipe 14B and the U-shaped plate 14C is not particularly limited, and for example, a metal material, a thermoplastic resin, other plastics, rubber, or the like can be used.

[Second Embodiment]
Next, a second embodiment will be described. In the second embodiment, only the configuration of the auxiliary air chamber member in the first embodiment is changed. Specifically, the auxiliary air chamber member according to the second embodiment is formed by processing the hollow pipe P (see FIG. 3A) in the same manner as described above, but crushing both ends Pa and Pa. Unlike the sub air chamber member 13 according to the first embodiment, which is manufactured as described above, only one end portion Pa of the hollow pipe P is crushed and processed.

  FIG. 6A is an enlarged perspective view of a main part of a sub air chamber member according to the second embodiment, and FIG. 6B is an enlarged cross-sectional view of a main part of the sub air chamber member according to the second embodiment. In addition, in FIG. 6, since the one edge part (flange part without a communicating hole) by which the subair chamber member was crushed is the same as 1st Embodiment (refer FIG.3 (b)), it is illustrated. Omitted.

  As shown in FIGS. 6A and 6B, the auxiliary air chamber member 15 according to the second embodiment is generally the same as the auxiliary air chamber member 13 of the first embodiment, as a whole, on the peripheral surface of the well portion 11c. It is the hollow member formed in the curved shape which follows this. The auxiliary air chamber member 15 is configured by attaching the lid member 16 by light press-fitting into the opening portion of the end portion 15a of the hollow pipe P (see FIG. 3A) that has not been crushed. . Thereby, the sub air chamber SC is formed in the inside. On the end side of the hollow pipe P, an extension part 15b is formed by cutting out the end part and extending a part thereof along the peripheral surface of the well part 11c.

  The lid member 16 is made of, for example, a metal material, and is formed in a substantially L-shaped cross section from the lid body 16a and the attachment portion 16b. The material of the lid member 16 may be made of a thermoplastic resin, other plastics, rubber or the like in addition to a metal material.

  The lid main body 16a is a member that covers the opening of the hollow pipe, and is formed thicker than the wall thickness of the hollow pipe P (see FIG. 3A). A communication hole 16c for communicating the tire air chamber MC and the sub air chamber SC is formed at the center of the lid main body 16a. The communication hole 16c is formed by burring on the thick lid main body 16a, thereby ensuring a predetermined length of the communication hole 16c. The attachment part 16b is a part attached to the rim 11 together with the extension part 15b extending from the end part 15a of the hollow pipe.

  The sub air chamber member 15 configured in this manner is fixed to the rim 11 by spot welding (three-spot spot welding) of the attachment portion 16b, the extension portion 15b, and the well portion 11c in the part S3. Yes.

As described above, the auxiliary air chamber SC and the communication hole 16c described above constitute a Helmholtz resonator. Therefore, the resonance sound generated in the tire air chamber MC can be reduced by matching the resonance frequency f ₀ obtained in the above (Equation 1) with the resonance frequency of the tire air chamber MC. In order to match this resonance frequency f ₀ , the length L of the communication hole 16c, the sectional area S of the opening of the communication hole 16c, and the volume V of the auxiliary air chamber SC are appropriately set.

According to the above, in the present embodiment, the following effects can be obtained.
In the present embodiment, one end (not shown) of the hollow pipe is crushed and a lid member 16 is attached to the opening of the end 15a at the other end, so that the air-tight side air can be easily obtained. A chamber SC can be formed.

  In the present embodiment, since the communication hole 16c is provided in the lid member 16 by burring, a predetermined length equal to or greater than the wall thickness of the auxiliary air chamber member 15 can be secured. In accordance with this, a predetermined opening cross-sectional area can be secured. Therefore, the silencing effect that makes the best use of the auxiliary air chamber capacity can be exhibited. Further, the communication hole 16c is formed in the lid member 16 attached to the end portion 15a of the auxiliary air chamber member 15, and does not protrude in a direction orthogonal to the peripheral surface of the rim 11. Without increasing the length of the neck and the cross-sectional area of the opening can be increased. And since the communication hole 16c is provided in the edge part of the sub air chamber member 15, and the distance to the opening part of the communication hole 16c and the opposing wall in the sub air chamber SC is ensured long, it is based on the influence of air reflection. Reduction of the silencing effect can be prevented.

  In this embodiment, when attaching the sub air chamber member 15 to the rim | limb 11, it is not necessary to use a highly accurate coupling method, Therefore The increase in a manufacturing man-hour and manufacturing cost can be suppressed. Thereby, mass productivity can be improved.

[Third Embodiment]
Next, a third embodiment will be described. In the third embodiment, only the configuration of the auxiliary air chamber member in the first embodiment is changed. Specifically, the sub air chamber member according to the third embodiment is formed by processing the hollow pipe P (see FIG. 3A) in the same manner as described above. Unlike the sub air chamber member 13 according to the first embodiment, which is manufactured by integrally forming a communication hole in a part of the air hole, the communication hole is formed by attaching another member.

  FIG. 7A is an enlarged perspective view of the main part of the auxiliary air chamber member according to the third embodiment, and FIG. 7B is an enlarged cross-sectional view of the main part of the auxiliary air chamber member according to the third embodiment. In FIG. 7, the end of the sub air chamber member where the communication hole is not formed is the same as that of the first embodiment (see FIG. 3B), and is not shown.

  As shown in FIGS. 7A and 7B, the sub air chamber member 17 according to the third embodiment is generally the same as the sub air chamber member 13 of the first embodiment, as the entire peripheral surface of the well portion 11 c. It is the hollow member formed in the curved shape which follows this. The auxiliary air chamber member 17 has a flange portion 17a (only one is shown) formed by crushing both ends of the hollow pipe. Thereby, the sub air chamber SC is formed in the inside.

  The sub air chamber member 17 has a communication pipe 18 (communication hole) that communicates the tire air chamber MC and the sub air chamber SC. The communication pipe 18 has a predetermined length, and forms a part of the contour of the auxiliary air chamber SC and is adjacent to the vertical wall portion 17b (the rising wall portion from the flange portion 17a) adjacent to the flange portion 17a. It is attached by press-fitting. The material of the communication pipe 18 is not particularly limited, and for example, a metal material, a thermoplastic resin, other plastics, rubber, or the like can be used.

  The sub air chamber member 17 configured in this manner is fixed to the rim 11 by spot welding (two-spot welding) of the flange portion 17a and the well portion 11c at the site S4.

The auxiliary air chamber SC and the communication pipe 18 described above constitute a Helmholtz resonator. Therefore, the resonance sound generated in the tire air chamber MC can be reduced by matching the resonance frequency f ₀ obtained in the above (Equation 1) with the resonance frequency of the tire air chamber MC. In order to match this resonance frequency f ₀ , the length L of the communication hole (communication pipe 18), the sectional area S of the opening of the communication hole (communication pipe 18), and the volume V of the auxiliary air chamber SC are appropriately set. .

According to the above, in the present embodiment, the following effects can be obtained.
In this embodiment, the airtight SC can be easily formed by crushing both end portions (only one is shown) of the hollow pipe.

  In this embodiment, since the communication hole 18 is formed by attaching the communication pipe 18 as another member, a predetermined length equal to or greater than the wall thickness of the auxiliary air chamber member 17 can be ensured. In accordance with this, a predetermined opening cross-sectional area of the communication hole can also be secured. Therefore, the silencing effect that makes the best use of the auxiliary air chamber capacity can be exhibited. Furthermore, since the communication pipe 18 is attached to the vertical wall portion 17b of the auxiliary air chamber member 17 and does not protrude in a direction orthogonal to the peripheral surface of the rim 11, the large neck length can be increased without hindering the tire assembling property. The opening cross-sectional area can be increased in size.

  Moreover, since the communication pipe 18 is provided in the vertical wall part 17b, since the distance from the opening part of the communication pipe 18 and the opposing wall in the sub air chamber SC is ensured long, it is based on the influence of air reflection. Reduction of the silencing effect can be prevented.

  In this embodiment, when attaching the sub air chamber member 17 to the rim | limb 11, it is not necessary to use a highly accurate coupling method, Therefore The increase in a manufacturing man-hour and manufacturing cost can be suppressed. Thereby, mass productivity can be improved.

  As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form.

  FIG. 8A is a perspective view of a sub air chamber member according to a modification of the third embodiment, and FIG. 8B is an enlarged cross-sectional view of a main part of the sub air chamber member according to a modification of the third embodiment. .

  In the embodiment, the communication pipe 18 is attached to the vertical wall portion 17b. However, the attachment position is not limited. For example, as shown in FIGS. 8A and 8B, in the auxiliary air chamber member 17A according to the modification, the communication pipe 19 may be provided by press-fitting into the upper wall 17c of the auxiliary air chamber member 17. Good. In this case, a stepped portion 19a may be provided in the communication pipe 19, and the stepped portion 19a may be attached to the recessed portion 17d provided in the upper wall 17c. Thereby, the communication pipe 19 can be prevented from projecting in a direction orthogonal to the well portion 11c of the rim 11, and the tire assembling property can be prevented from being hindered.

  In the above embodiment, the auxiliary air chamber member (15, 17, etc.) is spot-welded to the well portion 11c of the rim 11, but the means for attaching the auxiliary air chamber member is not limited, and arc welding or the like. Other general industrial product bonding methods such as welding, friction stir welding, bonding with an adhesive, fastening with bolts and nuts, and caulking can be used.

  In the above embodiment, the auxiliary air chamber member (13, 15, 17, etc.) is attached to the side of the well portion 11c away from the surface of the disk 12, but this attachment position is not limited. For example, the well portion 11c may be attached to the center position in the width direction, or may be attached to the side close to the surface of the disk 12.

  In the above embodiment, one sub air chamber SC is formed in one sub air chamber member (13, 15, 17, etc.), but the structure of the sub air chamber member is not limited. For example, Two or more auxiliary air chambers may be formed by crushing the central portion together with both ends of the hollow pipe. Further, the length and volume of the auxiliary air chamber member, the length of the communication hole (13b, 16c, etc.), and the opening cross-sectional area can be appropriately set and changed.

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 a perspective view which shows a hollow pipe (sub-air chamber member before a process), (b) is a perspective view which shows a sub-air chamber member. It is side surface sectional drawing of the wheel for vehicles which attached the sub air chamber member. (A) The principal part expansion perspective view of the sub air chamber member which concerns on the modification 1 of 1st Embodiment, (b) is the principal part expansion perspective view of the sub air chamber member which concerns on the modification 2 of 1st Embodiment. FIG. 6C is an enlarged perspective view of the main part of the auxiliary air chamber member according to Modification 3 of the first embodiment. (A) is a principal part expansion perspective view of the sub air chamber member which concerns on 2nd Embodiment, (b) is a principal part expanded sectional view of the sub air chamber member which concerns on 2nd Embodiment. (A) is a principal part expansion perspective view of the sub air chamber member which concerns on 3rd Embodiment, (b) is a principal part expanded sectional view of the sub air chamber member which concerns on 3rd Embodiment. (A) is a perspective view of the sub air chamber member which concerns on the modification of 3rd Embodiment, (b) is a principal part expanded sectional view of the sub air chamber member which concerns on the modification of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle wheel 11 Rim 12 Disc 13, 13A, 13B, 13C Sub air chamber member 13a Flange part 13b Communication hole 15 Sub air chamber member 16 Lid member 16c Communication hole 17, 17A Sub air chamber member 17a Flange part 17b Vertical wall part 18, 19 Communication pipe MC Tire air chamber P Hollow pipe Pa End SC Secondary air chamber

Claims (4)

A vehicle wheel in which the auxiliary air chamber member is fixed to the tire air chamber side of the wheel,
The auxiliary air chamber member is
A hollow pipe is processed, and both ends of the hollow pipe are crushed to form a sub air chamber formed therein, and a communication hole communicating the sub air chamber and the tire air chamber. Formed with
The communication hole is
It is provided in a part of the crushed portion, and is formed by a cavity having one end opened to the tire air chamber and the other end opened to the auxiliary air chamber at an outer end portion of the portion. Vehicle wheel. A vehicle wheel in which the auxiliary air chamber member is fixed to the tire air chamber side of the wheel,
The auxiliary air chamber member is
A hollow pipe is processed, and one end of the hollow pipe is crushed and a lid member thicker than the wall thickness of the hollow pipe is attached to the opening of the other end to the inside of the hollow pipe. A sub-air chamber formed, and a communication hole communicating the sub-air chamber and the tire air chamber,
The communication hole is
A vehicle wheel formed on the lid member. A vehicle wheel in which the auxiliary air chamber member is fixed to the tire air chamber side of the wheel,
The auxiliary air chamber member is
A hollow pipe is processed, and both ends of the hollow pipe are crushed to form a sub air chamber formed therein, and a communication hole communicating the sub air chamber and the tire air chamber. Formed with
The communication hole is
A vehicle wheel comprising a communication pipe attached to a wall portion of the auxiliary air chamber member.   The vehicle wheel according to claim 3, wherein the wall portion is a vertical wall portion adjacent to the crushed portion.

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