JP2008120306A - Vehicular wheel and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular wheel capable of reducing air-column resonance and cutting down weight as compared with conventional wheels, and a manufacturing method therefor. <P>SOLUTION: This vehicular wheel 1 is provided with a sub air chamber 13 and a communicating means 17 for making the sub air chamber 13 communicate with a tire air chamber MC. The sub air chamber 13 includes a recessed portion 14 formed along the circumferential direction at a well 12D arranged inside the radial direction from the bead sheet 12A of a rim 12 and a lid member 15 for blocking the opening of the recessed portion 14. Opening tops (tops portions 14b, 14b) of the recessed portion 14 are lower than the bead sheet 12A in the radial direction. <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, and a method for manufacturing the vehicle wheel.

  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. In this vehicle wheel, a lid member is installed between the vertical wall formed in the well portion of the rim and the bead seat portion, and a secondary air chamber is formed between the rim and the lid member. The chamber is divided in the circumferential direction by a partition fixed to the rim and the vertical wall. 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 Laying-Open No. 2004-90669 (FIG. 1)

  By the way, it is known that the weight reduction of the unsprung weight greatly affects the motion performance of the vehicle, and it is known that the effect of the unsprung weight is more than ten times that of the unsprung weight. The weight reduction has been attracting particular attention.

  However, in the vehicle wheel according to the prior art, since a part of the bead seat portion is used as the erection position of the lid member, the vertical wall having the same height as the bead seat portion provided in the well portion and the lid member are separated. Only the weight was increased, which was not preferable from the viewpoint of vehicle performance.

  Then, this invention makes it a subject to provide the manufacturing method of the vehicle wheel which reduced the weight conventionally, and the manufacturing method of a vehicle wheel in the vehicle wheel which reduces air column resonance sound.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a vehicle wheel provided with a sub air chamber and communication means for communicating the sub air chamber with the tire air chamber, wherein the sub air chamber includes a rim. Formed in a well portion located radially inward of the bead sheet portion along the circumferential direction, and a lid member that closes the opening of the recess, and the top of the opening of the recess has its diameter The height of the direction is lower than the bead sheet portion.

  According to invention of Claim 1, the opening top part of the recessed part which forms a subair chamber is formed in the radial direction lower than the bead seat part. Thereby, if it is a vehicle wheel with the same rim diameter, a weight can be reduced rather than the conventional vehicle wheel in which the vertical wall of the height same as the height of the bead seat part in the rim diameter direction was formed.

  According to a second aspect of the present invention, in the vehicle wheel according to the first aspect, the recess includes an outer peripheral surface of the well portion and a pair of vertical walls formed on the outer peripheral surface along the circumferential direction. It is characterized by comprising.

  According to the second aspect of the present invention, since the recess is formed only by providing the pair of vertical walls on the outer peripheral surface of the well portion, the structure can be simplified.

  According to a third aspect of the present invention, in the vehicle wheel according to the first aspect, the well portion includes a small-diameter portion and a large-diameter portion that continues to the small-diameter portion via a step portion, The concave portion is constituted by an outer peripheral surface of the small diameter portion, a vertical wall formed on the outer peripheral surface of the small diameter portion along the circumferential direction, and the step portion.

  According to the invention of claim 3, since the concave portion is configured by using the shape of the small diameter portion, the large diameter portion and the step portion of the well portion, and only having one vertical wall on the outer peripheral surface of the small diameter portion, The structure can be simplified. Further, in this vehicle wheel, since the vertical wall is formed only on one side in the width direction of the recess, the vertical rim is formed on both sides in the width direction of the recess. Adhesiveness can be secured satisfactorily.

  According to a fourth aspect of the present invention, in the vehicle wheel according to any one of the first to third aspects, a plurality of partition walls that divide the concave portion in the circumferential direction are formed integrally with the well portion. It is characterized by.

  According to the invention described in claim 4, the partition wall is formed integrally with the well portion. This eliminates the need for fixing the separate partition wall to the rim and the vertical wall, which has occurred during the manufacture of the conventional vehicle wheel, and can improve mass productivity as compared with the prior art. Moreover, compared with the case where a partition is comprised with another member, parts cost and manufacturing cost are also reduced significantly.

  According to a fifth aspect of the present invention, in the vehicle wheel according to any one of the first to fourth aspects, the communication means is provided in at least one of the lid member and the recess. Features.

  According to the fifth aspect of the present invention, the communication means is provided in at least one of the lid member and the recess. For this reason, the length of the communication means and the opening cross-sectional area can be easily adjusted by processing the lid member before being attached to the recess or by processing the recess before the lid member is attached. The “communication means” includes a convex portion provided by breathing on the outer peripheral portion of the lid member, a hole drilled in the lid member by various processes such as burring, a grommet of another member attached to the lid member, A hollow pipe, a hole formed in a recess, a groove, and the like can be given.

  According to a sixth aspect of the present invention, in the vehicle wheel according to the fourth aspect, the communication means is provided in the partition wall.

  According to the sixth aspect of the present invention, the communication means is provided in the partition wall. For this reason, the length of the communication means and the opening cross-sectional area can be easily adjusted by processing the partition wall before the lid member is attached. The “communication means” includes a groove formed in the partition wall.

  According to a seventh aspect of the present invention, in the vehicle wheel according to any one of the first to sixth aspects, the vehicle wheel has a sensor that detects tire air pressure, and the sensor is a sub air chamber of the lid member. It is fixed to the opposing surface.

  According to the seventh aspect of the present invention, the sensor is fixed to the sub air chamber facing surface of the lid member. Thereby, the holding | maintenance function of a sensor can be given to a cover member.

  According to an eighth aspect of the present invention, in the vehicle wheel according to the fourth aspect of the present invention, the vehicle wheel includes a sensor that detects tire air pressure, and the sensor is accommodated in an accommodating portion that is recessed in the outer peripheral surface of the partition wall. It is characterized by being fixed.

  According to the eighth aspect of the present invention, the sensor is housed and fixed in the housing portion formed in the partition wall. Thereby, the holding function of the sensor can be given to the partition wall.

  The invention according to claim 9 is a method for manufacturing a vehicle wheel, wherein the first mold having a shape corresponding to the vehicle outer side of the vehicle wheel in manufacturing the vehicle wheel according to claim 4. And a plurality of molds divided into at least two or more corresponding to the circumferential direction of the rim, and the plurality of molds are combined to form a shape corresponding to the radially outer side of the rim. The vehicle wheel is cast using a casting mold comprising two molds and a third mold having a shape corresponding to the radially inner side of the rim, and the vehicle wheel is used for the casting. When removing from the mold, the plurality of molds constituting the second mold are each opened in a direction away from the rim of the vehicle wheel.

  According to the ninth aspect of the present invention, the plurality of partition walls that divide the recesses in the circumferential direction can be easily formed by the second mold having a shape corresponding to the radially outer side of the rim of the vehicle wheel. . In addition, since the partition wall is formed integrally with the rim (well portion), parts cost and manufacturing cost are greatly reduced and productivity is greatly improved as compared with the case where the partition wall is formed of a separate member. be able to.

  The invention according to claim 10 is a method for manufacturing a vehicle wheel, and in manufacturing the vehicle wheel according to any one of claims 1 to 8, the disk of the vehicle wheel and the A step of casting the width direction disk side of the rim including the recess, and a remaining part of the rim width direction including a bead sheet portion opposite to the disk side by spinning a molded product obtained by the casting. And a step of forming.

  According to the invention described in claim 10, the remaining portion in the width direction of the rim including the bead sheet portion on the side opposite to the disk side is formed by spinning. Thereby, the problem of deterioration in the accuracy of directional solidification that occurs on the front end side of the remaining portion in the rim width direction during casting can be solved by providing the well with the recess.

  According to the present invention, there is provided a vehicle wheel and a vehicle wheel manufacturing method with reduced weight compared to a conventional vehicle wheel in which a vertical wall having the same height as the height of the bead seat portion in the rim radial direction is formed. can get.

<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 partially sectional perspective view showing a state in which a tire is assembled to a vehicle wheel according to an embodiment. 2A and 2B are cross-sectional views of the vehicle wheel in the rim width direction, where FIG. 2A is a cross-sectional view including a sub air chamber, and FIG. 2B is a cross-sectional view including a partition wall. FIG. 3 is a cross-sectional view in the circumferential direction of the vehicle wheel according to the first embodiment. 2A is a cross-sectional view taken along line AA in FIG. 3, and FIG. 2B is a cross-sectional view taken along line BB in FIG.

  A vehicle wheel 1 shown in FIG. 1 is configured to have a vehicle wheel W mounted with a tire T, and a tire air chamber MC that is an annular sealed space is formed between the tire T and the vehicle wheel 1. Yes.

[Vehicle wheel 1]
As shown in FIGS. 2A and 2B, the vehicle wheel 1 includes a disk 11, a rim 12 provided on the outer peripheral side of the disk 11, on which a tire T is mounted, and a secondary air chamber 13. Prepare mainly. The vehicle wheel 1 is made of, for example, a material such as an aluminum alloy or a magnesium alloy, and is integrally formed by casting as described later.

  The disk 11 is provided for connection to a hub (not shown).

  The rim 12 includes bead sheet portions 12A and 12A formed at both ends in the width direction, rim flange portions 12B and 12B formed radially outward from the bead sheet portions 12A and 12A, and a bead sheet portion 12A, It has hump parts 12C and 12C formed inside width direction 12A, and well part 12D formed between hump parts 12C and 12C.

  The bead portions Tb and Tb (see FIG. 1) of the tire T are assembled to the bead seat portions 12A and 12A, and the bead portions Tb are prevented from being detached sideways (outside in the width direction) by the rim flange portions 12B and 12B. ing. Further, the hump parts 12C, 12C have a shape that rises slightly from the bead sheet parts 12A, 12A, and after the tire T is mounted, the bead parts Tb, Tb of the tire T are inward in the width direction. Preventing depression. Further, the well portion 12D is formed in a concave shape so as to be located radially inward from the bead seat portions 12A and 12A, and when the tire T is assembled, the bead portions Tb and Tb can be dropped.

  The auxiliary air chamber 13 is formed in the well portion 12D from a concave portion 14 formed along the circumferential direction and a lid member 15 that closes (covers) the opening of the concave portion 14, and is appropriately spaced in the circumferential direction. It is divided by the partition 16 provided. The auxiliary air chamber 13 has a capacity of about 20 to 700 cc per air chamber.

  The concave portion 14 is formed by a pair of vertical walls 14a and 14a formed on the outer peripheral surface of the well portion 12D. The recess 14 is formed at the time of molding the vehicle wheel 1 by casting with a partition wall 16 (see FIGS. 2B and 3) described later.

  As shown in FIG. 2A, the vertical walls 14a and 14a are formed such that the heights in the radial direction of the top portions 14b and 14b (opening top portions of the recesses) are lower than the sheet surfaces of the bead sheet portions 12A and 12A. Yes. Thereby, an increase in weight is suppressed. The top portions 14b and 14b are formed in a stepped shape, and the lid member 15 is fitted into the lower step portions 14c and 14c. Thereby, the airtightness in the auxiliary air chamber 13 is ensured. In addition, in order to improve airtightness, you may interpose a sealing material between the cover member 15 and the vertical walls 14a and 14a.

  As shown in FIG. 3, the lid member 15 is formed of, for example, a metal plate or the like, and has an arc shape corresponding to the opening of the recess 14. One lid member 15 is provided between the partition walls 16 and 16 provided in the circumferential direction. Further, the lid member 15 has a communication means 17 at the center in the width direction at one end in the circumferential direction. The communication means 17 is integrally formed when the lid member 15 is pressed, and has a predetermined length in the circumferential direction and is formed in a circular arc shape that rises outward in the radial direction (see FIG. 2 (b)). As a result, a communication hole 13 a that connects the tire air chamber MC and the auxiliary air chamber 13 is formed between the communication means 17 and the partition wall 16.

  As shown in FIG. 3, four partition walls 16 are formed in the circumferential direction, each having a predetermined circumferential length. In addition, two lid members 15, 15 adjacent in the circumferential direction are fixed to the partition wall 16 by screws. One auxiliary air chamber 13 is formed between the partition walls 16 adjacent to each other in the circumferential direction, and a total of four sub air chambers 13 are formed in this embodiment. By forming the plurality of auxiliary air chambers 13 in this way, the sound absorption characteristics can be stabilized.

  The auxiliary air chamber 13 and the communication hole 13a described above constitute a Helmholtz resonator and serve to reduce air column resonance generated when the vehicle travels. The following (Expression 1) is an expression for obtaining the resonance frequency of this resonator.

f ₀ = C / 2π × √ (S / V (L + α × √S)) (Equation 1)
f ₀ (Hz): resonance frequency C (m / s): sound velocity inside the auxiliary air chamber 13 (= sonic velocity inside the tire air chamber MC)
V (m ³ ): Volume of the sub air chamber 13 L (m): Length of the communication hole 13 a S (m ² ): Cross-sectional area of the opening of the communication hole 13 a α: Correction coefficient

This By matching the resonance frequency f ₀ obtained in (Equation 1) to the resonant frequency of the tire air chamber MC, it is possible to reduce the air column resonance noise generated in the tire air chamber MC. Incidentally, to match the resonance frequency _{f 0,} it is set the length L of the communication hole 13a, the opening cross-sectional area S of the communication hole 13a, the volume V of the sub air chamber 13 as appropriate.

[Method for Manufacturing Vehicle Wheel 1]
Next, a method for manufacturing the vehicle wheel 1 according to the present embodiment will be described. Hereinafter, as a method for manufacturing the vehicle wheel 1, two manufacturing methods (first manufacturing method and second manufacturing method) will be described.

(First manufacturing method)
FIG. 4 is a schematic cross-sectional view of a mold corresponding to the rim width direction. FIG. 5 is a schematic cross-sectional view of a mold corresponding to the circumferential direction of the rim. The first manufacturing method is a manufacturing method by casting. 5 is a cross-sectional view of a position corresponding to the line CC in FIG.

  First, a mold used in the first manufacturing method will be described. As shown in FIG. 4, a mold 20 used in the first manufacturing method includes a fixed lower mold 21 (first mold), four side molds 22 (second mold) (see FIG. 5), an upper mold It is comprised from the type | mold 23 (3rd metal mold | die).

  The fixed lower mold 21 has a mold surface mainly corresponding to the outer side of the disk 11 and the rim 12 (see FIG. 1). As shown in FIG. 5, the side mold 22 is divided into four parts in the circumferential direction of the rim 12 so that the partition forming portions 22a corresponding to the partition walls 16 are located in the mold dividing portion, and these are combined. Thus, as shown in FIG. 4, the mold surface has a shape corresponding to the radially outer side of the rim 12. Further, the upper mold 23 has a mold surface having a shape corresponding to the vehicle inner side of the disk 11 and the radial inner side of the rim 12, and has a gate 23a.

  In the first manufacturing method, first, as shown in FIG. 4, the four side molds 22 are slid to a predetermined position with respect to the fixed lower mold 21, and the upper mold 23 is directed toward the fixed lower mold 21 at a predetermined position. The cavity C1 is formed by combining the molds by lowering the mold to the lower limit.

  Thereafter, an aluminum alloy heated and melted at 800 ° C. in an electric furnace or the like is poured into the cavity C1 from the gate 23a at a predetermined position of the upper mold 23. Then, the mold is removed when the aluminum alloy is cooled. At this time, each side mold 22 is moved in a direction away from the outer peripheral surface of the rim 12 as shown in FIG. By using the side mold 22 thus divided, the partition wall 16 can be integrally formed on the peripheral surface of the well portion 12D.

  Then, the lid member 15 having the communication means 17 (see FIG. 1 and the like) is attached so as to close the recess 14 and is screwed to the partition walls 16 and 16. Thereby, the vehicle wheel 1 is completed.

  According to such a manufacturing method, the plurality of partition walls 16 that divide the concave portion 14 in the circumferential direction can be integrally formed by the four side molds 22. Further, since the partition wall 16 is integrally formed with the well portion 12D of the rim 12, compared with the case where the partition wall 16 is formed of a separate member, the parts cost and the manufacturing cost are greatly reduced, and the productivity is greatly increased. Can be improved.

  In addition, in this embodiment, since the mold division of the side mold | type 22 is divided into 4, when changing the number of partition walls to form, it is preferable on modeling and casting quality that it is a multiple of 4.

  Further, in the present embodiment, as shown in FIG. 5, the side mold 22 in which the partition wall forming portion 22 a is located in the mold part is used, but the shape of the side mold 22 is not limited. FIG. 6 is a schematic cross-sectional view according to a modified example of the mold corresponding to the circumferential direction of the rim. For example, as shown in FIG. 6, a side mold 22A in which the partition forming portion 22b is located at the center of the mold may be used. According to such a side mold 22A, the shape of the partition wall 16 can be formed with high accuracy. According to this, for example, in the case where communication means or the like is formed on the partition wall 16 side (modified examples 1 and 2 of the communication means described later (FIGS. 8 to 11) and the like), the dimensional accuracy can be increased.

(Second manufacturing method)
FIGS. 7A to 7C are schematic diagrams for explaining the second manufacturing method. The second manufacturing method is not a manufacturing method of only casting as in the first manufacturing method, but a manufacturing method by casting (FIG. 7 (a)) and spinning (FIGS. 7 (b) and (c)). It is.

  In the second manufacturing method, the width direction disk side of the disk 11 and the rim 12 (see FIG. 2) is cast-molded as a first step, and the remaining width direction of the rim 12 is formed by spinning as a second step.

  First, the casting process in the first step will be described. As shown in FIG. 7 (a), the mold 24 used in this step is composed of a fixed lower mold 25, a side mold 26, and an upper mold 27. By combining these, the disk 11 and A cavity C2 having a shape corresponding to the width direction disk side of the rim 12 (see FIG. 2) is provided. The width direction disk side of the rim 12 includes at least the recess 14 formed on the peripheral surface of the well portion 12D.

  In the first step, as shown in FIG. 7A, the side mold 26 is slid to a predetermined position with respect to the fixed lower mold 25, and the upper mold 27 is lowered toward the fixed lower mold 25 to the predetermined position. Combine the types. Thereby, the cavity C2 is formed.

  Thereafter, a molten aluminum alloy is poured into the cavity C <b> 2 from the gate 27 a at one end of the upper mold 27. Then, the mold is removed when the aluminum alloy is cooled. The procedure for removing the mold is the reverse of the procedure for combining the molds 24 described above. Thereby, the disk 11 of the vehicle wheel 1 and the width direction disk side of the rim 12 are formed.

  Next, the spinning forming in the second step will be described. As shown in FIGS. 7B and 7C, the mold 28 used in this step is a mold having a shape corresponding to the radially inner side of the rim 12. In the second step, as shown in FIG. 7B, the inner side in the radial direction of the rim 12 of the cast product obtained in the first step is processed into a mold 28 that rotates on the disk shaft together with the cast product. Press with roller 29. Then, as shown in FIG. 7C, the processing roller 29 is rotated and moved in the direction opposite to the disk 11 side to form the remaining width direction portion of the rim 12. Then, the lid member 15 having the communication means 17 (see FIG. 1) is attached so as to close the recess 14 and is screwed to the partition walls 16 and 16. Thereby, the vehicle wheel 1 is completed.

  According to such a manufacturing method, by providing the well portion 12D with the concave portion 14, the accuracy of the directional solidification that may occur in the bead sheet portion 12A and the rim flange portion 12B on the opposite side of the disk 11 during casting is deteriorated. The problem can be solved.

  In the above-described manufacturing method, in the second step of spinning molding, the mold 28 having a shape corresponding to the inner side in the radial direction of the rim 12 is used to press the processing roller 29 from the outer side in the radial direction. Is not limited to this. For example, it is good also as an aspect pressed with a process roller from a radial inside using the metal mold | die of the shape corresponding to the radial direction outer side of the rim | limb 12. FIG. This also makes it possible to manufacture the vehicle wheel 1.

[Operational effects of vehicle wheel 1]
According to the above, the following effects can be obtained in the present embodiment.
The concave portion 14 forming the auxiliary air chamber 13 is formed such that the heights of the top portions 14b, 14b in the radial direction are lower than the sheet surfaces of the bead sheet portions 12A, 12A. Thereby, a weight can be reduced rather than the conventional vehicle wheel in which the vertical wall which has the height same as the height of the rim radial direction of a bead seat part was formed.

  Since the partition wall 16 is integrally formed with the well portion 12D, the fixing work for fixing the partition wall of the separate member to the rim and the vertical wall, which has been generated at the time of manufacturing the conventional vehicle wheel, becomes unnecessary. Mass productivity can be improved. Moreover, compared with the case where a partition is comprised with another member, parts cost and manufacturing cost are also reduced significantly.

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

[Modification of communication means]
In the first embodiment, the communication means 17 for communicating the tire air chamber MC and the auxiliary air chamber 13 is provided at the circumferential end of the lid member 15 (see FIG. 1), but the communication means is not limited to this. However, it can be implemented as follows.

  FIG. 8 is an enlarged exploded perspective view of the main part showing the vicinity of the communication means according to Modification 1, and FIG. 9 is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to Modification 1. FIG. 10 is an enlarged exploded perspective view of the main part showing the vicinity of the communication means according to the second modification, and FIG. 11 is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to the second modification.

  For example, as shown in FIG. 8, the communication means 17A can be provided on the partition wall 16 side. The communication means 17A is provided only on one side of the partition walls 16 and 16 forming one sub air chamber 13, and is formed to have a predetermined length along the circumferential direction from the sub air chamber 13 side. It is a groove. As shown in FIG. 9, the lid member 15 having no communication means is fixed to the partition wall 16 so as to cover a part of the communication means 17, so that the communication hole 13 a is formed between the lid member 15 and the partition wall 16. It is formed.

  Further, the shape of the communication means 17A is not limited. For example, as shown in FIG. 10, the communication means 17B is formed in a T shape in plan view from a groove 17a extending in the circumferential direction and a groove 17b extending in the width direction. The groove 17a is appropriately set to determine the length of the communication hole 13a (see FIG. 11) and the opening cross-sectional area. The groove 17b is wider and deeper than the groove 17a. Then, as shown in FIG. 11, the lid member 15 is fixed to the partition wall 16 so as to cover the groove 17a of the communication means 17B, whereby a communication hole 13a is formed between the lid member 15 and the partition wall 16. . By ensuring the groove 17b to be wide and deep, air flow between the tire air chamber and the auxiliary air chamber 13 is not hindered. Further, the weight of the vehicle wheel 1 is also reduced.

  Further, the communication means may be constituted by a groove or a hole provided in the vertical wall 14a of the recess 14 instead of the partition wall 16 described above. Furthermore, the cross-sectional shape of the communication hole formed by the communication means is not particularly limited as long as a necessary cross-sectional area is ensured, but a circular shape and a square shape are preferable in terms of processing. In addition, these communication means 17A and 17B may be formed integrally when the vehicle wheel 1 is cast, or may be processed after casting.

  Further, the communication means can be provided at the center of the lid member. FIG. 12A is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to Modification 3, and FIG. 12B is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to Modification 4. FIG. 7C is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to the fifth modification.

  For example, as shown in FIG. 12 (a), the communication means 17C may be configured by a hole drilled in the center of the lid member 15, or as shown in FIG. 12 (b), The communication means 17D may be configured by a hole formed in the center of the lid member 15 so as to have a predetermined length by burring. As shown in FIG. 12C, the communication means 17E may be a hollow grommet or a hollow pipe attached to the lid member 15. When burring, grommet, or the like is used, it is easy to secure the predetermined length of the communication hole and the cross-sectional area of the opening, and tuning can be facilitated.

<Second Embodiment>
Next, the vehicle wheel according to the second embodiment will be described.
FIG. 13 is an enlarged cross-sectional view of a main part in the width direction of the vehicle wheel according to the second embodiment. The vehicle wheel according to the present embodiment is implemented by changing the configuration of the concave portion of the first embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 13, in this embodiment, the recess 31 is formed using the shape of the well portion 30.

  First, the well portion 30 is composed of a small-diameter portion 32 formed on the disk side and a large-diameter portion 34 continuous to the small-diameter portion 32 via a step portion 33, and is formed in a shape having a step in the radial direction. ing.

  The small-diameter portion 32 is a portion having the smallest diameter in the well portion 30 and is largely secured in the width direction. A single vertical wall 32a is formed in the small diameter portion 32 along the circumferential direction, and a top portion 32b (opening top portion of the concave portion) of the vertical wall 32a is formed in a stepped shape.

  The step portion 33 is a vertical wall 33a formed so as to increase in diameter from the small diameter portion 32 toward the large diameter portion 34, and the top portion 33b (opening top portion of the recess) is formed in a stepped shape. The top portion 32b of the vertical wall 32a and the top portion 33b of the stepped portion 33 are both formed at the same radial height and lower than the sheet surfaces of the bead sheet portions 12A and 12A. Thus, the increase in weight is suppressed by suppressing the radial height.

  The large diameter portion 34 is formed to have a smaller diameter than the bead sheet portion 12A. The small diameter portion 32 and the large diameter portion 34 are formed so that the small diameter portion 32 is wider than the large diameter portion 34. Thus, weight reduction can be achieved by increasing the ratio in the width direction of the small diameter portion 32.

  The recess 31 is formed by a vertical wall 32 a formed in the small diameter portion 32 and a vertical wall 33 a of the step portion 33. This recessed part 31 is divided | segmented into the circumferential direction by the partition which is not shown in figure like 1st Embodiment. The auxiliary air chamber 13 is formed by attaching the lid member 15 that closes the opening to the recess 31 formed in this manner.

According to the above, the following effects can be obtained in the vehicle wheel according to the present embodiment.
The top portions 32b and 33b of the vertical walls 32a and 33a constituting the recess 31 are formed so that the height in the radial direction is lower than the bead sheet portions 12A and 12A. Thereby, weight can be reduced rather than the conventional vehicle wheel in which the vertical wall of the height same as the height of the rim radial direction of a bead seat part was formed. Moreover, since the recessed part 31 is comprised only by providing the one vertical wall 32a in the outer peripheral surface of the small diameter part 32 using the shape of the well part 30, a structure can be simplified. Furthermore, in this vehicle wheel, since the vertical wall is formed only on one side in the width direction of the recess 31, the vehicle wheel 1 according to the first embodiment in which the vertical wall is formed on both sides in the width direction of the recess 31, The rim assembly property of the tire can be ensured satisfactorily.

  In addition, the shape of the small diameter part 32, the level | step difference part 33, and the large diameter part 34 of this embodiment is not limited. For example, the small-diameter portion 32 may be formed in a shape that expands from the deepest portion to the stepped portion 33, or the stepped portion 33 extends from the small-diameter portion 32 to the large-diameter portion 34 along the radial direction. It may be formed perpendicularly to. Moreover, the large diameter part 34 may be formed in a shape that expands from the step part 33 to the bead sheet part 12A.

<Third Embodiment>
Next, a vehicle wheel according to a third embodiment will be described.
14A and 14B are diagrams showing a vehicle wheel according to a third embodiment, in which FIG. 14A is a cross-sectional view in the circumferential direction, and FIG. 14B is a cross-sectional view taken along line DD in FIG. The vehicle wheel according to the third embodiment is a vehicle wheel according to the first embodiment having a function of holding an air pressure sensor that detects air pressure. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 14A, the vehicle wheel 1 includes an air pressure sensor 41 used in an air pressure monitoring system and the like, and a weight 42. The air pressure sensor 41 is housed in a rectangular parallelepiped resin case, and is fixed to the sub air chamber facing surface 15a of one lid member 15A among the four lid members 15 (see FIG. 14B). Further, the weight 42 has the same mass as the air pressure sensor, and is fixed to the sub air chamber facing surface 15a of the lid member 15B that faces the one lid member 15A in the radial direction. When the air pressure sensor 41 and the weight 42 are fixed to the lid member 15, a fixing method used in general industrial products such as an adhesive, a double-sided tape, and a screw can be used.

  According to this configuration, the vehicle wheel 1 that reduces air column resonance noise can have a function of holding the air pressure sensor 41 simultaneously with the attachment of the lid member 15 to the rim 12. Further, by attaching the weight 42, the wheel balance can be easily adjusted.

<Fourth Embodiment>
Next, a vehicle wheel according to a fourth embodiment will be described.
15A and 15B are diagrams showing a vehicle wheel according to a fourth embodiment, in which FIG. 15A is a cross-sectional view in the circumferential direction, and FIG. 15B is a cross-sectional view taken along line EE in FIG. As in the third embodiment, the vehicle wheel 1 according to the fourth embodiment is a vehicle wheel according to the first embodiment having a function of holding an air pressure sensor that detects air pressure. However, the mounting location of the air pressure sensor is different from that of the third embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 15A, the vehicle wheel 1 includes an air pressure sensor 41 used in an air pressure monitoring system and the like, and a weight 42, and a sensor holding portion 43 for holding the air pressure sensor 41. And a weight holding portion 44 for holding the weight 42. The sensor holding part 43 is formed in one partition 16A of the four partitions 16, and the weight holding part 44 is formed in the partition 16B at a position facing the one partition 16A in the radial direction. Since the sensor holding unit 43 and the weight holding unit 44 have the same configuration, only the configuration of the sensor holding unit 43 will be described below.

  The sensor holding portion 43 includes a recess 43 a formed in one partition 16 A of the four partitions 16 and a pressing portion 43 b formed at one end of the lid member 15. The recess 43a is formed in a rectangular parallelepiped shape in the partition wall 16 so as to accommodate the air pressure sensor 41. Further, the pressing portion 43b is formed in a semicircular cross-section projecting radially inward at the end of the lid member 15 on the side where the communication means 17 is not formed (see FIG. 15B). The air pressure sensor 41 is housed in the recess 43 a and is fixed to the rim 12 by being pressed by a pressing portion 43 b formed on the lid member 15. At this time, the lid member 15 is screwed and fixed to the partition wall 16A, and at the same time, the pressing portion 43b fixes the air pressure sensor 41 in the concave portion 43a. In addition, it is preferable that the recessed part 43a of the sensor holding | maintenance part 43 is substantially the same as the dimension of the pneumatic sensor 41 to accommodate. If comprised in this way, the backlash at the time of accommodation can be prevented.

  According to this configuration, in the vehicle wheel 1 that reduces air column resonance noise, the partition wall 16A can be thinned and lightened, and the function of holding the air pressure sensor 41 can be provided. Further, since the air pressure sensor 41 can be attached simultaneously with the attachment of the lid member 15 to the rim 12, the production efficiency is also improved. In addition, by fixing the weight 42 to the weight holding portion 44, the wheel balance can be easily adjusted.

Next, a vehicle wheel according to a modification of the fourth embodiment will be described.
FIG. 16 is a cross-sectional view in the circumferential direction of a vehicle wheel according to a modification of the fourth embodiment. FIGS. 17A and 17B are diagrams showing a method of fixing the air pressure sensor according to the modification of the fourth embodiment, wherein FIG. 17A is an enlarged perspective view of the main part in the vicinity of the air pressure sensor, and FIG. It is a principal part expansion disassembled perspective view. The vehicle wheel according to this modification is obtained by changing the fixing method of the air pressure sensor 41 and the weight 42 in the vehicle wheel according to the fourth embodiment. In the present embodiment, the same components as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 16, the vehicle wheel 1 includes an air pressure sensor 41 used for an air pressure monitoring system and the like, and a weight 42, and further includes a sensor holding portion 45 for holding the air pressure sensor 41, and a weight 42. And a weight holding portion 46 for holding the.

  The sensor holding part 45 is formed in one of the four partition walls 16A, and the weight holding part 46 is formed in the partition wall 16B at a position facing the one partition wall 16A in the radial direction. Since the sensor holding unit 45 and the weight holding unit 46 have the same configuration, only the configuration of the sensor holding unit 45 will be described below.

  As shown in FIG. 17 (b), the sensor holding part 45 includes a recess 45a formed in the partition wall 16A and flange mounting parts 45b formed on both sides in the circumferential direction of the recess 45a. The recess 45a has a size that can accommodate the air pressure sensor 41 and is formed in a rectangular parallelepiped shape. Further, the flange mounting portion 45b is formed with a shallow step from the outer surface of the partition wall 16A. The resin case of the air pressure sensor 41 has a pair of flange portions 41a and 41a. The flange portions 41a and 41a are fixed to the rim 12 by screws to the flange mounting portions 45b. (See FIG. 17 (a)).

  According to this configuration, in the vehicle wheel that reduces air column resonance, the partition wall 16A can be thinned and reduced in weight, and the function of holding the air pressure sensor 41 can be provided. Further, since the air pressure sensor 41 is screwed to the sensor holding portion 45, it is securely fixed. Furthermore, the wheel balance can be easily adjusted by attaching the weight 42.

  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 said embodiment, although the cover member 15 shall be formed from a metal, the material of the cover member 15 is not limited. For example, general industrial product materials such as plastic, other resin materials, and rubber materials can be used. In this case, weight reduction can be improved by using a lighter material.

  In the above embodiment, the lid member 15 is fixed to the rim 12 (partition wall 16 or the like) by screws, but the method for fixing the lid member 15 is not limited to this. For example, a fixing method used in general industrial products such as press-fitting, fitting, caulking, adhesion, and welding can be used.

  In the above embodiment, four auxiliary air chambers 13 are provided in the circumferential direction of the rim 12, but the number of auxiliary air chambers 13 is not limited. For example, it may be 3 or less, or 5 or more. In addition, it is preferable that it is 2-4 from the restriction | limiting of the capacity | capacitance of the sub air chamber 13 which can be ensured realistically.

It is a partial cross section perspective view which shows the state by which the tire was assembled | attached to the vehicle wheel which concerns on 1st Embodiment. It is a rim width direction sectional view of a wheel for vehicles, (a) is a sectional view containing a sub air chamber [AA arrow sectional view of Drawing 3] (b) is a sectional view containing a partition [B of Drawing 3 -B line arrow sectional drawing]. 1 is a circumferential cross-sectional view of a vehicle wheel according to a first embodiment. It is a schematic cross section of the metal mold | die corresponding to a rim width direction. It is a schematic cross section of the metal mold | die corresponding to a rim circumferential direction. It is a schematic cross section concerning the modification of the metallic mold corresponding to the rim circumferential direction. (A)-(c) is a schematic diagram explaining the 2nd manufacturing method. The second manufacturing method is not a manufacturing method of only casting as in the first manufacturing method, but a manufacturing method by casting (FIG. 7 (a)) and spinning (FIGS. 7 (b) and (c)). It is. It is a principal part expansion disassembled perspective view which shows the communication means vicinity which concerns on the modification 1. FIG. It is a principal part expanded sectional view of the rim circumference direction which shows the communication means vicinity which concerns on the modification 1. FIG. FIG. 10 is an enlarged exploded perspective view of a main part showing the vicinity of communication means according to a second modification. FIG. 10 is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to Modification 2. (A) is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to Modification 3, (C) is an enlarged cross-sectional view of the main part in the rim circumferential direction showing the vicinity of the communication means according to Modification 5. It is a principal part expanded sectional view of the width direction of the wheel for vehicles concerning a 2nd embodiment. It is a figure which shows the vehicle wheel which concerns on 3rd Embodiment, (a) is sectional drawing of the circumferential direction, (b) is a DD sectional view taken on the line of (a). It is a figure which shows the wheel for vehicles which concerns on 4th Embodiment, (a) is sectional drawing of the circumferential direction, (b) is EE arrow sectional drawing of (a). It is sectional drawing of the circumferential direction of the wheel for vehicles which concerns on the modification of 4th Embodiment. It is a figure which shows the fixing method of the air pressure sensor which concerns on 4th Embodiment modification, (a) is a principal part expansion perspective view near a pneumatic sensor, (b) is a principal part expansion exploded perspective view near a pneumatic sensor. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle wheel 2 Mold 3 Mold 11 Disc 12 Rim 12A Bead sheet | seat part 12D Well part 13 Sub air chamber 13a Communication hole 14 Recessed part 14a Vertical wall 14b Top part 15 Lid member 15a Sub air chamber opposing surface 16 Bulkhead 17 Communication means 20 Mold 21 Fixed mold (1st mold)
22 side mold (second mold)
23 Upper mold (3rd mold)
31 Concave portion 32 Small diameter portion 32a Vertical wall 32b Top portion 33 Stepped portion 33a Vertical wall 33b Top portion 34 Large diameter portion 41 Air pressure sensor 42 Weight 43, 45 Sensor holding portion 44, 46 Weight holding portion 30 Well portion MC Tire air chamber T Tire

Claims (10)

A vehicle wheel comprising a sub air chamber and communication means for communicating the sub air chamber with the tire air chamber,
The auxiliary air chamber is formed of a recess formed along the circumferential direction in a well portion located radially inward of the bead seat portion of the rim, and a lid member that closes the opening of the recess,
The vehicle wheel according to claim 1, wherein the opening top of the recess has a lower radial height than the bead seat.   2. The vehicle wheel according to claim 1, wherein the recess includes a pair of vertical walls formed along the circumferential direction on the outer peripheral surface of the well portion. The well portion has a small diameter portion and a large diameter portion continuous to the small diameter portion via a stepped portion,
2. The vehicle wheel according to claim 1, wherein the concave portion is configured by a vertical wall formed along a circumferential direction on an outer peripheral surface of the small diameter portion and the stepped portion.   The vehicle wheel according to any one of claims 1 to 3, wherein a partition wall that divides the auxiliary air chamber in a circumferential direction is formed integrally with the well portion.   The vehicle wheel according to any one of claims 1 to 4, wherein the communication means is provided in at least one of the lid member and the recess.   The vehicle wheel according to claim 4, wherein the communication means is provided in the partition wall.   7. The vehicle according to claim 1, further comprising a sensor that detects tire air pressure, wherein the sensor is fixed to a surface facing the sub air chamber of the lid member. wheel.   The vehicle wheel according to claim 4, further comprising a sensor that detects tire air pressure, wherein the sensor is housed and fixed in a housing portion that is recessed in the outer peripheral surface of the partition wall. In manufacturing the vehicle wheel according to claim 4,
A first mold having a shape corresponding to the vehicle outer side of the vehicle wheel;
A second gold having a shape corresponding to the radially outer side of the rim by combining a plurality of molds divided into at least two molds corresponding to the circumferential direction of the rim. Type,
A third mold having a shape corresponding to the radially inner side of the rim;
Casting the vehicle wheel using a casting mold comprising:
When removing the vehicle wheel from the casting mold, the plurality of molds constituting the second mold are each opened in a direction away from the rim of the vehicle wheel. A method for manufacturing a vehicle wheel. In manufacturing the vehicle wheel according to any one of claims 1 to 8,
Casting the disk in the vehicle wheel and the width direction disk side of the rim including the recess; and
Spinning a molded product obtained by the casting to form a width direction remaining portion of the rim including a bead sheet portion opposite to the disk side;
A method for manufacturing a vehicle wheel, comprising:

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