JP2013107599A - Resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resonator which achieves weight reduction and low cost, and can provide desired performance reliably.SOLUTION: An engagement part 36 is bendably extended from an outer edge part of a body part 35. The engagement 36 is bent to the body part 35 so that a junction part 49 which is continuous from the outer edge part of the body part 35 is press-contacted to a rim surface 26 of a wheel 11. Under this condition, a protruding part 34 that faces the rim surface 26 holds an end part side so that a sub air chamber 38 is defined between the rim surface 26 and the body part 35. The body part 35 is provided with a communication part 37 which allows communication between the sub air chamber 38 and an air chamber 25.

Description

  The present invention relates to a resonator that is arranged in an air chamber between a tire and a wheel to which the tire is attached to reduce noise.

  Conventionally, for a wheel in which a rubber tire is mounted on a metal wheel, random vibration transmitted from the road surface to the tire vibrates air in the air chamber between the wheel and the tire, and near the air column resonance frequency of the air chamber. A phenomenon in which a resonance phenomenon (cavity resonance) is generated and noise that is a resonance sound is generated is known. And in order to reduce this noise, the auxiliary air chamber which communicates with the air chamber via the communicating portion is formed in the wheel, and the communicating portion and the auxiliary air chamber constitute a resonator (resonator) that functions as a Helmholtz resonator. A configuration that reduces noise is known (for example, see Patent Document 1). The configuration of the cited document 1 is a so-called run-flat tire, in which a support portion formed by deforming one metal plate with respect to a rim surface of a metal wheel is supported by rubber legs. A body member, a lid member is attached to the support part, and a sub air chamber is defined between the support part and the lid member, and the sub air chamber is a communication part provided in the support part. It is formed so as to communicate with the air chamber through a certain communication hole.

JP 2004-148978 A (Page 5-8, FIG. 1)

  However, the above-described resonator has a problem that the component cost, weight, assembly man-hours and the like increase because the number of component parts is large.

  In this regard, for example, it is conceivable to form a hollow resonator that partitions the auxiliary air chamber inside by resin molding by blow molding or the like. However, in the Helmholtz resonator, the resonance frequency is set according to the capacity of the sub-air chamber, the length of the communicating portion, the cross-sectional area, etc., so it was intended when formed by blow molding where dimensional accuracy such as thickness is not easy to manage. It is not easy to obtain performance, and post-processing is required, increasing the number of man-hours and partitioning the auxiliary air chamber inside, resulting in a heavy weight.

  The present invention has been made in view of these points, and an object of the present invention is to provide a resonator that can be reduced in weight and cost and can reliably obtain desired performance.

  The resonator according to claim 1 is a resonator that is arranged in an air chamber between a tire and a wheel to which the tire is attached to reduce noise, and can be bent from a main body portion and an outer edge portion of the main body portion. The end side is held by the holding portion facing the rim surface in a state where the portion extending and bent with respect to the main body portion and continuing to the outer edge portion of the main body portion is pressed against the rim surface of the wheel. A locking portion that partitions the sub air chamber between the rim surface and the main body portion, and a communication portion that is provided in the main body portion and communicates the sub air chamber and the air chamber. is there.

  The resonator according to claim 2 is the resonator according to claim 1, wherein the engaging portion has a distance from a portion continuous with the outer edge portion of the main body portion to an end portion side held by the holding portion, and the rim surface of the wheel. It is formed more than the distance with the holding part.

  According to a third aspect of the present invention, in the resonator according to the first or second aspect, the locking portion includes a valve body that protrudes from a portion continuous with the outer edge portion of the main body portion and is elastically pressed against the rim surface of the wheel. It is what it has.

  According to the resonator of the first aspect, the locking portion extending from the outer edge portion of the main body portion is bent with respect to the main body portion, and the portion continuous with the outer edge portion of the main body portion is in pressure contact with the rim surface of the wheel. Since the auxiliary air chamber is partitioned between the main body and the rim surface of the wheel by holding the end side on the holding portion, for example, it is possible to reduce the weight compared to the case where the auxiliary air chamber is formed inside. In addition, the cost can be reduced by reducing the part cost and assembly man-hours associated with the reduction in the number of parts, and the resonator can be formed by, for example, injection molding using synthetic resin, thereby improving the dimensional accuracy. Therefore, desired performance can be obtained with certainty.

  According to the resonator of the second aspect, in addition to the effect of the resonator of the first aspect, the distance from the portion continuous with the outer edge portion of the main body portion of the locking portion to the end portion side held by the holding portion is determined by the wheel. By setting the distance between the rim surface and the holding portion to be equal to or greater than the distance between the rim surface and the holding portion, when the centrifugal force acts as the wheel rotates and the end portion side of the locking portion is pressed against the holding portion, the reaction force is Since the portion that is continuous with the main body portion of the locking portion is more reliably pressed against the rim surface, the fixing strength and performance with respect to the wheel can be further improved.

  According to the resonator of the third aspect, in addition to the effect of the resonator according to the first or second aspect, the portion that is continuous with the outer edge portion of the main body portion of the locking portion is elastically pressed against the rim surface of the wheel. By projecting the valve body, the part that continues to the outer edge of the main part of the locking part is securely pressed against the rim surface via the valve body without unnecessarily improving the accuracy of the rim surface of the wheel. It can be held in the

It is a longitudinal cross-sectional view which shows the attachment state to the wheel of 1st Embodiment of the resonator of this invention. It is a longitudinal cross-sectional view which expands and shows a part of FIG. It is a longitudinal cross-sectional view which shows the state just before attaching a resonator to a wheel same as the above. It is a perspective view of a resonator same as the above. It is a perspective view which shows the wheel which attached the resonator same as the above. It is a longitudinal cross-sectional view which expands and shows a part of attachment state to the wheel of 2nd Embodiment of the resonator of this invention. It is a longitudinal cross-sectional view which expands and shows a part of resonator same as the above. It is a longitudinal cross-sectional view which shows a part of 3rd Embodiment of the resonator of this invention. It is a perspective view which shows a part of 4th Embodiment of the resonator of this invention.

  Hereinafter, a first embodiment of a resonator of the present invention will be described with reference to the drawings.

  1 to 5, reference numeral 10 denotes a wheel device, and the wheel device 10 is also called a resonator wheel including a metal wheel 11 and, for example, a plurality (four) of resonators 12 attached to the wheel 11. The wheel of an automobile is configured by attaching a rubber tire (not shown) to the wheel device 10.

  The wheel 11 includes a rim portion 16, a hub portion 17 located inside the rim portion 16, and a disk portion 18 that connects the rim portion 16 and the hub portion 17. The rim portion 16 is provided with a bead seat portion 21 formed along both end portions in the width direction of the wheel 11, and further projecting outward from the outer end side of the bead seat portion 21 in the radial direction of the wheel 11. A rim flange portion 22 and a well portion 23 that is located between the bead seat portions 21 and is recessed toward the inner side in the radial direction of the wheel 11 are provided. Then, by mounting the bead portion of the tire on the bead seat portion 21, an air chamber 25 having a predetermined volume, which is an annular sealed space, is surrounded by the rim portion 16 of the wheel 11 and the tire. . The well portion 23 of the rim portion 16 is provided for temporarily dropping the bead portion of the tire when the tire is assembled to the rim portion 16. Each resonator 12 is attached to the rim surface 26 that is the bottom of the well portion 23.

  A groove 28 as a wheel side fitting portion is formed on both sides of the well portion 23, that is, on the back side of the bead seat portions 21, 21, in other words, on the rim surface 26 side of the bead seat portions 21, 21. Has been. These groove portions 28, 28 are opposed to the rim surface 26 from the side surfaces 31, 31 as side portion holding surfaces raised from both sides of the rim surface 26 along the radial direction of the wheel 11. The holding surfaces 32 and 32 folded back are formed in a U shape, and are continuous over the entire circumference of the wheel 11, for example. That is, the holding surfaces 32 and 32 are opposed to the rim surface 26 at positions spaced from the rim surface 26. Therefore, the inner edge portions of the bead sheet portions 21 and 21 are protruding portions 34 and 34 as holding portions protruding toward the center side in the width direction. That is, the back surfaces of the projecting portions 34 and 34 are holding surfaces 32 and 32 that hold the resonator 12.

  Each resonator 12 can also be called a wheel resonator, and is integrally molded by, for example, injection molding using a synthetic resin such as polypropylene, and protrudes in a flange shape from both sides of the main body 35 and the outer edge of the main body 35. A locking portion 36 that is a fitting arm, and a communication portion 37 that is provided in a cylindrical shape on the main body portion 35 are provided. Each resonator 12 is fixed to the wheel 11 by the engaging portion 36 being fitted and held in the groove portion 28 of the wheel 11, and the sub-resonator 12 is interposed between the rim surface 26 of the wheel 11 and the main body portion 35. The air chamber 38 is partitioned.

  The main body 35 includes, for example, a rectangular (rectangular) flat plate-shaped top surface portion 41, plate-shaped (one and other) end surface portions 42 and 42 extending at both longitudinal ends of the top surface portion 41, and these end surface portions. Plate-like (one and the other) extending portions 43, 43 extending from 42, 42, and plate-like (one and the other) side surface portions 44 extending on both sides in the width direction of the top surface portion 41, 44 is integrated. Then, the end surface portions 42 and 42 and the side surface portions 44 and 44 are inclined with respect to the top surface portion 41 in the thickness direction, that is, toward the wheel 11 side, so that the main body 35 has the end surface portions 42 and 42 and the side surface portions 44. , 44 are curved so as to divide the space 45 surrounded by the back side. Further, on the back side of the main body portion 35, that is, on the rim surface 26 side, a rib 46, which is a reinforcing portion for reinforcement, is provided integrally from the top surface portion 41 to the end surface portions 42 and 42. Further, the main body 35 is attached to the wheel 11 with the direction along the circumferential direction of the wheel 11 as a longitudinal direction.

  Each extending portion 43 is formed in a flat plate shape substantially parallel to the top surface portion 41, and extends along the rim surface 26 in a state where the resonator 12 is assembled to the wheel 11. In other words, these extending portions 43 are in surface contact with the rim surface 26.

  The rib 46 has a longitudinal shape continuously extending over one end surface portion 42, the top surface portion 41, and the other end surface portion 42. A plurality of ribs 46 are provided apart from each other in the longitudinal direction of the main body portion 35. Instead of the rib 46, a bead may be provided as a reinforcing part, or the main body part 35 may be formed thick.

  In addition, the locking portion 36 has a long plate shape (one and the other) that is continuous over both sides of the outer edge portion of the main body portion 35, that is, both sides of the side surface portions 44, 44 and the extending portions 43, 43. Locking portion main bodies 48, 48, and connecting portions 49, 49 formed linearly at portions where these locking portion main bodies 48, 48 and the side surface portions 44, 44 and both end surface portions 42, 42 are continuous. Is provided. In other words, in the locking portion 36, the locking portion main bodies 48, 48 and the side surfaces 44, 44 and both sides of the extending portions 43, 43 are continuous via the connecting portions 49, 49.

  Each locking portion main body 48 is bent in a direction away from the rim surface 26 from each connecting portion 49 on the base end side with respect to both sides of the outer edge portion of the main body portion 35. In addition, each locking portion body 48 gradually has a thickness dimension from each connecting portion 49 to the outer edge portion 52 side which is the tip side by gradually inclining the back surface 51 side from each connecting portion 49 to the outer edge portion 52 side. A held portion 53 is provided, and a locking projection 54 is projected from the tip of the held portion 53.

  Each held portion 53 is a portion that is provided so as to be elastically deformable, and is a portion that is fitted into the groove portions 28 and 28 and elastically held by the protruding portions 34 and 34 when each resonator 12 is attached to the wheel 11, A held surface 53a held by the holding surface 32, and a curved portion 53b as a sliding portion continuous on the opposite side of the locking projection 54 with respect to the held surface 53a.

  The held surface 53a is a part constituting the tip of the held portion 53, and the distance L1 between the held surface 53a and each connecting portion 49 is the distance between the rim surface 26 and the holding surfaces 32, 32. L2 or higher is set (L1 ≧ L2). Therefore, the locking portion 36 is arranged so that the locking portion main bodies 48, 48 are pressed against the rim surface 26 at the connecting portions 49, 49, that is, between the rim surface 26 and the holding surfaces 32, 32. It is configured to be elastically held in a state where a tension is applied.

  The curved portion 53b is curved in a circular arc shape in cross section, and assists the insertion of the held portion 53 into the groove portion 28 by slidingly contacting the corner portion of the protruding portion 34 when the resonator 12 is attached to the wheel 11. It is a part to do.

  Each locking projection 54 extends along the thickness direction of the locking portion main body 48, that is, the direction intersecting (orthogonal) with the held surface 53a of each held portion 53, and the back side is each It is a flat contact surface 54a that is continuous with the held surface 53a of the held portion 53 and contacts the tip of each protrusion 34. Then, the groove-shaped resonator side that is continuous along the longitudinal direction of the resonator 12 between the held portion 53 and the locking projection portion 54 by the contact surface 54a and the held surface 53a of the held portion 53. It is a fitting part 55.

  In addition, each connecting portion 49 is a pressed contact portion that is linearly pressed (line contacted) along the longitudinal direction with respect to the rim surface 26, and each locking portion main body 48 is connected to the main body portion 35. The hinge portion is elastically bent.

  The communication portion 37 communicates the air chamber 25 and the sub air chamber 38, and is provided in the central portion of the top surface portion 41 of the main body portion 35, and has a circular opening 57 in the central portion. doing. The opening 57 is provided through the top surface 41 in the thickness direction.

  Then, with the air chamber 25 as the main air chamber, the capacity (volume) of the sub air chamber 38, the length of the communication portion 37, and the like are set so as to satisfy the following equations for obtaining the resonance frequency of the Helmholtz resonator.

fo = C / 2π × √ (S / V (L + α × √S))
fo [Hz]: resonance frequency of the air chamber 25 C [m / s]: sound velocity inside the air chamber 25 S [m ² ]: cross-sectional area of the opening 57 of the communication portion 37 of the resonator 12 V [m ³ ]: resonator Volume of 12 sub-air chambers L [m]: Length of communicating portion 37 of resonator 12 α: Correction coefficient

  The resonance frequency fo is set in accordance with the resonance frequency of the air chamber 25. For the plurality of resonators 12 provided in the air chamber 25, all the resonators 12 are set to the same setting. When a plurality of resonance frequencies are recognized, the resonators 12 having different settings respectively set to the resonance frequency of the air chamber 25 may be used, or may be set to an average value of the plurality of resonance frequencies of the air chamber 25. it can.

  When the resonator 12 is assembled to the wheel 11, as shown in FIG. 3, the engaging portion of the engaging portion 36 is located at a position near the connecting portions 49, 49 with respect to the protruding portions 34, 34 of the wheel 11. From the state in which the resonator 12 is opposed to the well portion 23 (FIG. 5) so that the back surfaces 51, 51 of the main bodies 48, 48 are brought into contact, the resonator 12 is pushed toward the rim surface 26 and inserted. The locking portions main bodies 48 and 48 of the locking portion 36 are connected to the main body portion 35 by the protrusions 34 and 34 while the back surfaces 51 and 51 are in sliding contact with the protrusions 34 and 34 downward. The bent portions 53b, 53b are in contact with the corners on the lower ends of the projecting portions 34, 34 at the positions where the connecting portions 49, 49 are in contact with the rim surface 26, and the held portions 53, 53 is guided into the grooves 28 and 28 (the projecting portions 34 and 34 are guided relatively to the resonator side fitting portions 55 and 55), and the held portions 53 and 53 are inserted into the grooves 28 and 28. And the protrusions 34 and 34 are fitted to the resonator-side fitting portions 55 and 55, the held surfaces 53a and 53a of the held portions 53 and 53 are in contact with the holding surfaces 32 and 32, and the locking protrusions The resonator 12 is fixed at a position where the contact surfaces 54a, 54a of the portions 54, 54 contact the protrusions 34, 34 (FIG. 1).

  In this state, the distance L1 between each connecting portion 49 and the held surface 53a of each held portion 53 is set to be equal to or greater than the distance L2 between the rim surface 26 and the holding surfaces 32 and 32. The locking portion 36 is a portion where the locking portion main bodies 48 and 48 are connected to the rim surface 26 in a state where tension is applied to the held surfaces 53a and 53a of the held portions 53 and 53 of the locking portion main bodies 48 and 48. It is pressed at 49,49. Then, the extended portions 43, 43 of the main body portion 35 are in surface contact with the rim surface 26, and the end surface portions 42, 42 and the side surface portions 44, 44 are raised with respect to the rim surface 26. A sub air chamber 38 is defined between the surface portion 41, the end surface portions 42 and 42, the side surface portions 44 and 44, and the rim surface 26. That is, the auxiliary air chamber 38 is partitioned at both ends in the longitudinal direction by the pressure contact between the extending portions 43, 43 and the rim surface 26, and both sides in the width direction are partitioned from the rim surface 26 by the connecting portions 49, 49. And communicates with the air chamber 25 via the communication portion 37. In other words, the auxiliary air chamber 38 is hermetically maintained over the entire outer edge portion of the main body portion 35.

  Thus, according to the present embodiment, each locking portion body 48 of the locking portion 36 extending from the outer edge portion of the main body portion 35 is bent with respect to the main body portion 35, and the outer edge portion of the main body portion 35 is The holding portion 53a on the end side of each locking portion main body 48 is held on each projecting portion 34 in a state where the connecting portion 49 that is a continuous portion is pressed against the rim surface 26 of the wheel 11, and the main body portion 35 Since the auxiliary air chamber 38 is partitioned between the rim surface 26 of the wheel 11 and the auxiliary air chamber 38 is formed inside, for example, the resonator is not required to be a bottom portion of the auxiliary air chamber 38. 12 weight savings are possible.

  In addition, since a member for covering the bottom of the auxiliary air chamber 38 is not required separately, it is possible to reduce the cost by reducing the number of parts and the number of assembling steps accompanying the reduction in the number of parts, and for example, using a synthetic resin It is possible to form by injection molding, almost no post-processing after molding is required, and dimensional accuracy can be improved compared to molding by blow molding, for example, so the capacity in the sub air chamber 38 Can be maintained with high accuracy, the desired performance can be obtained reliably, and the sound deadening performance is not impaired.

  In addition, the distance L1 from the connecting portion 49, which is a portion continuous with the outer edge portion of the main body portion 35 of the locking portion 36, to the held surface 53a on the end portion side held by each protruding portion 34 is expressed as the rim surface of the wheel 11. By setting the distance 26 between the protrusion 26 and the distance L2 or more, the connecting portion 49 can be brought into close contact with the rim surface 26 in a state where a tension is applied to the held surface 53a of the locking portion 36. Then, when the centrifugal force acts on the resonator 12 as the wheel 11 rotates and the held surface 53a of the locking portion 36 is pressed against each protrusion 34, the reaction force is connected to the connecting portion of the locking portion 36. 49, the connecting portion 49 of the locking portion 36 is more reliably pressed against the rim surface 26, so that the fixing strength and performance of the resonator 12 to the wheel 11 can be further improved.

  In addition, by providing the reinforcing rib 46 on the resonator 12, deformation of the resonator 12 after the resonator 12 is assembled to the wheel 11 can be prevented, the auxiliary air chamber 38 can be secured, and the rigidity of the resonator 12 is improved. In addition, the force in the direction of pressing against the rim surface 26 acts, and the airtightness of the auxiliary air chamber 38 can be further improved.

  Furthermore, by providing the communication part 37 at the center part of the top surface part 41, when the resonator 12 rotates with the rotation of the wheel 11, the liquid can be easily discharged from the opening 57 of the communication part 37 by centrifugal force. That is, when the wheel 11 receives the centrifugal force that rotates, the liquid in the auxiliary air chamber 38 adheres to the top surface portion 41. Furthermore, since the center portion in the width direction of the top surface portion 41 swells, the liquid is collected on the center side and is smoothly and rapidly discharged into the air chamber 25 outside the auxiliary air chamber 38. In this way, the liquid that has entered the sub-air chamber 38 can be efficiently and quickly discharged, and a change in resonance characteristics due to a change in the volume of the sub-air chamber 38 can be suppressed, thereby realizing a stable silencing performance.

  And, the wheel equipped with the tire 11 on the wheel 11 provided with the resonator 12 of the present embodiment, the resonator 12 provided with the communication portion 37 communicating with the air chamber 25 and the auxiliary air chamber 38 functions as a Helmholtz resonator. It is possible to stably reduce noise that is a resonance sound due to a resonance phenomenon near the air column resonance frequency caused by vibration of air in the air chamber 25 due to vibration transmitted from the road surface to the tire.

  Next, a second embodiment will be described with reference to FIGS. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, a valve body 59 is projected from each connecting portion 49 of the first embodiment.

  Each valve body 59 is a lip portion that protrudes in a lip shape from the whole or a part of each connecting portion 49 toward the outer lower side (the rim surface 26 side). That is, each valve body 59 is directed from a side opposite to the top surface portion 41 of each side surface portion 44 of the main body portion 35 toward a direction along the surface direction of the side surface portion 44 in a direction different from each locking portion main body 48. And protruding.

  The valve body 59 may be integrally molded with the same material as the resonator 12, or may be integrally molded with the resonator 12 by multicolor molding (two-color molding) or the like, It may be assembled to the resonator 12.

  Then, when this resonator 12 is attached to the wheel 11, the held portions 53, 53 are inserted and fitted into the grooves 28, 28, and the protrusions 34, 34 are fitted to the resonator-side fitting portions 55, 55, The held surfaces 53a and 53a of the held portions 53 and 53 are in contact with the holding surfaces 32 and 32, the contact surfaces 54a and 54a of the locking protrusions 54 and 54 are in contact with the protrusions 34 and 34, and the valve body 59 is deformed while following the shape of the rim surface 26 to absorb dimensional tolerances and the like, and the locking portion 36 is press-contacted linearly against the rim surface 26 via the valve body 59.

  Thus, according to the present embodiment, the valve that is elastically pressed against the rim surface 26 of the wheel 11 to the connecting portion 49 that is a portion continuous with the outer edge portion of the main body portion 35 of the locking portion 36. By projecting the body 59, the followability on the side of the resonator 12 with respect to the rim surface 26 of the wheel 11 is improved, so that the finishing accuracy of the rim surface 26 of the wheel 11 is not increased more than necessary, and the main body portion of the locking portion 36 A portion continuous with the outer edge portion of 35 can be held in a state in which it is surely brought into linear contact with the rim surface 26 via the valve body 59. Therefore, the manufacturing cost of the wheel 11 can be reduced and the cost can be further reduced.

  In each of the above-described embodiments, for example, as in the third embodiment shown in FIG. 8, the locking portion 36 may not have the locking protrusion 54 in each locking portion main body 48. Is possible. In this case, the held portion 53 of each locking portion main body 48 is inserted into each groove portion 28, and the held surface 53a and the curved portion 53b of the held portion 53 are held by the holding surface 32 and the side surface 31, respectively. By doing so, each locking portion main body 48 of the locking portion 36 is held at the three points of the holding surface 32, the side surface 31, and the rim surface 26, and the resonator 12 is fixed to the wheel 11. Even in this case, the same effects as those of the above-described embodiments can be obtained.

  In addition, the valve body 59 of the second embodiment may be applied to the third embodiment.

  Further, in each of the above embodiments, for example, as in the fourth embodiment shown in FIG. 9, the communication portion 37 serves as a contact surface that contacts the rim surface 26 of the wheel 11 instead of the top surface portion 41. You may provide in the semi-cylindrical shape (tunnel shape) etc. which continue from one end surface part 42 over one extension part 43. FIG. That is, the communication part 37 can be provided in an arbitrary shape in an arbitrary position of the main body part 35 as long as the air chamber 25 and the auxiliary air chamber 38 communicate with each other and a desired resonance frequency of the resonator 12 can be generated. .

  In each of the above-described embodiments, the locking portion 36 is bent in a V shape, for example, in cross-sectional view with respect to the side portion of the main body portion 35 (the side portions 44 and 44 and the extending portions 43 and 43). And may be provided so as to be continuous.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a resonator that is arranged in an air chamber of an automobile wheel and reduces noise caused by resonance.

11 wheel
12 Resonator
25 Air chamber
26 Rim surface
34 Protruding part as holding part
35 Main unit
36 Locking part
37 Communication part
38 Secondary air chamber
59 Disc

Claims (3)

A resonator that is arranged in an air chamber between a tire and a wheel to which the tire is attached to reduce noise,
The main body,
The main body portion extends from the outer edge portion so as to be bendable. The portion that is bent with respect to the main body portion and continues to the outer edge portion of the main body portion is in pressure contact with the rim surface of the wheel and faces the rim surface. A locking part that partitions the auxiliary air chamber between the rim surface and the main body part by holding the end side on the holding part,
A resonator provided in the main body and comprising a communication part that communicates the auxiliary air chamber and the air chamber. The locking portion is characterized in that a distance from a portion continuous with the outer edge portion of the main body portion to an end portion side held by the holding portion is greater than a distance between the rim surface of the wheel and the holding portion. The resonator according to claim 1. 3. The resonator according to claim 1, wherein the locking portion includes a valve body that protrudes at a portion continuous with the outer edge portion of the main body portion and is elastically pressed against the rim surface of the wheel.

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