JP2015168404A - resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resonator which can suppress manufacturing costs while dealing with a plurality of wheels of different sizes.SOLUTION: A resonator includes a resonator body 36 which has a longitudinal direction along a circumferential direction of a wheel and in which a sub air chamber 44 is provided inside. The resonator body 36 includes a communication part 37 for communicating the sub air chamber 44 with an air chamber. In the resonator body 36, a hinge part 42 is provided which makes the resonator body 36 deformable along an outer periphery of the wheel. When engaging a resonator 12 by engaging parts 47, 47 at both side parts with respect to a plurality of wheels of different sizes, the hinge part 42 deforms in a follow-up manner and mounting can be performed with good accuracy, so that the resonator can deal with the plurality of wheels of different sizes. Manufacturing costs can be suppressed compared with the case in which resonators of mutually different types are manufactured corresponding to the wheel of each size.

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. There is a known phenomenon in which a resonance phenomenon (cavity resonance) is generated and noise called air column resonance is generated. And in order to reduce this noise, the sub air chamber which communicates with an air chamber via a cylindrical communication part is divided inside, and the resonator (resonator) which functions as a Helmholtz resonance sound absorber by the communication part and the sub air chamber Is known (for example, see Patent Document 1).

JP 2010-95069 A (page 4-7, FIG. 1-5)

  Since the resonator as described above is required to be in close contact with the outer circumference of the wheel curved in an arc shape with high accuracy, the resonator is designed according to the size (rim diameter) of the wheel. For this reason, when dealing with wheels of different sizes, a new design is required according to each size, which may increase the cost.

  This invention is made | formed in view of such a point, and it aims at providing the resonator which can suppress manufacturing cost, respond | corresponding to the several wheel from which size differs.

  The resonator according to claim 1, wherein the resonator is disposed in an air chamber between a tire and a wheel to which the tire is attached to reduce noise, and has a longitudinal direction along a circumferential direction of the wheel. A resonator main body provided with a sub air chamber inside and a locking portion locked to the wheel on both sides, and a communication portion provided in the resonator main body and communicating the sub air chamber with the air chamber; The resonator main body has an easily deformable portion that can deform the resonator main body along the outer periphery of the wheel.

  The resonator according to claim 2 is the resonator according to claim 1, wherein the resonator main body includes a plurality of air chamber portions in the longitudinal direction, each having a sub air chamber therein and a locking portion on each side portion. The easily deformable part connects the air chambers to each other.

  According to a third aspect of the present invention, in the resonator according to the first or second aspect, the communicating portion is provided on one side of the resonator main body, and the resonator main body is positioned in the circumferential direction of the wheel.

  According to the resonator according to claim 1, when the resonator is locked to the plurality of wheels having different sizes by the locking portions on both sides, the easily deformable portion that can deform the resonator body along the outer periphery of the wheel. Can follow and deform with high accuracy, can handle a plurality of wheels of different sizes, and can suppress manufacturing costs as compared to the case of manufacturing different types of resonators corresponding to the wheels of each size.

  According to the resonator of the second aspect, in addition to the effect of the resonator according to the first aspect, an easily deformable portion is provided between the plurality of air chamber portions in which the auxiliary air chambers are respectively provided and the locking portions are provided on both side portions. Since the air chamber portions separated by the easily deformable portions can be fixed to the wheel by the locking portions individually, the longitudinal dimension of the auxiliary air chamber can be relatively shortened. This makes it less susceptible to the centrifugal force caused by the rotation of the and makes it possible to fix the resonator more firmly to the wheel.

  According to the resonator of the third aspect, in addition to the effect of the resonator according to the first or second aspect, the communicating portion is provided on one side of the resonator main body, and the resonator main body is positioned in the circumferential direction of the wheel. The mounting operation becomes easier, and the resonator can be easily fixed in the circumferential direction without using a separate stopper or the like, and can be made less susceptible to the centrifugal force generated by the rotation of the wheel.

1 is a perspective view showing a first embodiment of a resonator according to the present invention. (A) is sectional drawing of the state which attached the resonator same as the above to a wheel, (b) is sectional drawing which expands and shows a part of (a). It is sectional drawing which shows the attachment operation | work to the wheel of a resonator same as the above in order of (a) (b). It is a perspective view which shows the wheel which attached the resonator same as the above. It is sectional drawing which shows 2nd Embodiment of the resonator of this invention. It is sectional drawing which shows a part of 3rd Embodiment of the resonator of this invention. It is sectional drawing which shows a part of 4th Embodiment of the resonator of this invention. It is sectional drawing which shows a part of 5th Embodiment of the resonator of this invention. It is sectional drawing which shows a part of 6th 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.

  3 and 4, reference numeral 10 denotes a wheel device. The wheel device 10 is also called a resonator wheel including a metal wheel 11 and, for example, a plurality of resonators 12 attached to the wheel 11 in the circumferential direction. 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 (not shown) located inside the rim portion 16, and a disk portion 18 that connects the rim portion 16 and the hub portion. 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.

  Then, on the rim surface 26 of the well portion 23, side surfaces 28 and 28 as side holding surfaces are raised along the radial direction of the wheel 11, and the resonator is attached by the side surfaces 28 and 28 and the rim surface 26. A mounting groove 29 as a portion is formed. At the upper ends of the side surfaces 28, 28, holding portions 33, 33 that are folded back so as to face the rim surface 26 are provided so as to be continuous over the entire circumference of the wheel 11, for example. That is, the holding portions 33 and 33 are located above the rim surface 26 at a position separated from the rim surface 26.

  The resonator 12 shown in FIGS. 1 to 3 can also be called a wheel resonator. The resonator main body 36 is integrally molded by, for example, blow molding using a synthetic resin, and is curved in an arc shape, and a side portion of the resonator main body 36. And a plurality of communication portions 37 projecting from each other. Further, these resonators 12 have a flat shape along the radial direction of the wheel 11, that is, a shape in which the thickness is set small with respect to the dimension (width) in both side directions intersecting (orthogonal) with the longitudinal direction, As a whole, it is curved along a predetermined arc. And these resonators 12 are attached with respect to the wheel 11 using the attachment means (FIG. 4) mentioned later.

  The resonator body 36 is formed in a longitudinal shape having a longitudinal direction along the circumferential direction of the wheel 11. The resonator main body 36 is integrally provided with a plurality of, for example, three air chamber portions 41 and a hinge portion 42 that is an easily deformable portion connecting the air chamber portions 41 and 41. Hereinafter, the longitudinal direction refers to the longitudinal direction of the resonator body 36, and the both-side directions refer to the direction orthogonal to the longitudinal direction of the resonator body 36.

  Each air chamber portion 41 includes a flat hollow air chamber portion main body 45 that defines a sub air chamber 44 therein, and a plate-like extending portion 46 that extends from the entire outer edge of the air chamber portion main body 45. It has. Further, both side portions of the extending portion 46 of the air chamber portion 41 are locking portions 47 and 47 held by the holding portions 33 and 33. These locking portions 47, 47 gradually curve toward the upper side in the thickness direction, that is, radially outward of the wheel 11 (the side away from the rim surface 26) as being separated from both side portions of the air chamber portion 41. And the corners of the holding portions 33 and 33 and the side surfaces 28 and 28 of the mounting groove 29 by contacting the rear surface of the holding portions 33 and 33, that is, the lower surface facing the rim surface 26. It is locked in the vicinity. Therefore, the resonator 12 is fixed to the wheel 11 by holding the locking portions 47 and 47 in the holding portions 33 and 33 so that the entire resonator 12 is accommodated in the mounting groove 29. .

  The auxiliary air chamber 44 is also referred to as a hollow portion, and is a space having a longitudinal direction along the circumferential direction of the wheel 11. Further, in the present embodiment, these auxiliary air chambers 44 are formed, for example, in the same shape (the same cross section and the same length) and set to the same capacity. Further, these auxiliary air chambers 44 are not provided with a passage or the like communicating with the outside other than the communication part 37, and the insides are not in direct communication with each other and are independent.

  The air chamber main body 45 includes a bottom plate portion 51 that faces the rim surface 26 so as to face the rim surface 26, and an upper plate portion 52 that faces above the bottom plate portion 51. The upper plate portion 52 is integrated with the outer edge portion, that is, the both end portions in the longitudinal direction and the both side directions to form a hollow shape.

  In the bottom plate portion 51, for example, a plurality of bead portions 54 bulging downward and spaced apart from the upper plate portion 52 are formed along the longitudinal direction and separated from each other in both side directions. These bead portions 54 improve the surface rigidity of the bottom plate portion 51, and by improving the surface rigidity, the attachment state of the resonator 12 to the wheel 11 is stabilized during high-speed traveling.

  The upper plate portion 52 is curved and formed so as to bulge upward away from the bottom plate portion 51.

  The extending part 46 is formed over the both ends of the bottom plate part 51 and the upper plate part 52 of the air chamber part main body 45 in the longitudinal direction and both side directions, and has a rectangular frame shape. The locking portions 47, 47 on both sides of the extending portion 46 can be elastically deformed in the thickness direction. Furthermore, these locking portions 47 are formed so as to be gradually curved toward the upper side in the thickness direction, that is, radially outward of the wheel 11 as they are separated from the both side portions of the air chamber portion 41, and the tip portion is By abutting against the back side of the holding portions 33, 33, that is, the lower surface facing the rim surface 26, the holding portions 33, 33 and the side surfaces 28, 28 of the mounting groove 29 are locked in the vicinity of the corners. ing.

  Each communication portion 37 communicates each sub air chamber 44 with the air chamber 25, and is formed in a cylindrical shape having a flat or circular cross section, and is formed at the central portion in the longitudinal direction of each air chamber portion 41. Projected on one side. That is, each communication portion 37 protrudes on the same side with respect to the resonator body 36. In addition, the communication portion 37 has a distal end projecting laterally from the locking portion 47 of the extending portion 46, and is cut into one of the mounting groove portions 29, on the side surface 28 on the outer side of the wheel 11 in the present embodiment. The resonator 12 is positioned in the circumferential direction of the wheel 11 by being inserted and fitted into the positioning hole 56 which is a not-formed communication hole from above.

  Then, with the air chamber 25 as the main air chamber, the capacity (volume) of the sub air chamber 44, 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 resonance sound absorber.

fo = C / 2π × √ (S / (V × L))
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 each communicating portion 37 of the resonator 12 V [m ³ ]: each of the resonator 12 Capacity of auxiliary air chamber L [m]: length of each communication part 37 of the resonator 12

  Therefore, from this equation, the resonance frequency is set to be larger as the cross-sectional area of the communication portion 37 is larger, the capacity of the auxiliary air chamber 44 is smaller, and the length of the communication portion 37 is shorter.

  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 length and the cross-sectional area of the communication portion 37 communicating with each sub air chamber 44 may be different, or the average value of the plurality of resonance frequencies of the air chamber 25 may be obtained. Can also be set.

  Each hinge portion 42 is for deforming the shape of the resonator body 36 so as to follow the rim surface 26 of the wheel 11, and the extending portions 46 of the air chamber portions 41, 41 adjacent to each other in the longitudinal direction face each other. The ends in the longitudinal direction are connected. These hinge portions 42 are thin portions formed thinner than the extending portion 46, and the lower side, that is, the side facing the rim surface 26 is flush with the extending portion 46, and the upper side, that is, the rim surface 26. The opposite side is formed so as to be recessed downward with respect to the extending portions 46 and 46.

  When manufacturing this resonator 12, first, for example, a parison supplied from above to below is set in a mold cavity and closed, and air is injected into the parison to perform blow molding. Then, the intermediate body is removed from the mold, and the tip of the communicating portion 37 is cut to an appropriate length and an unnecessary portion (burr) is removed, whereby the resonator 12 is completed. At this time, the resonator 12 is formed to have a curvature (curvature radius) substantially equal to the rim surface 26 of the largest (diameter dimension) among a plurality of sizes (rim diameters) of the wheel 11 assumed to be mounted. In the present embodiment, for example, the resonator 12 is manufactured so as to be curved in advance along the rim surface 26 of the 18-inch wheel 11 having a predetermined rim diameter.

  Next, attachment means for attaching the resonator 12 to the wheel 11 will be described.

  3 and 4 show an example of the attaching means. First, the communicating portions 37 of the resonator 12 are inserted into the positioning holes 56 with respect to the attaching groove portion 29 of the wheel 11 and positioned in the circumferential direction. The resonator 12 is inserted into the mounting groove 29 from one locking portion 47 in an inclined manner, and the tip of the one locking portion 47 is brought into contact with the corner portion of the one holding portion 33 and the one side surface 28. Then, the lower part of each air chamber 41 is brought into contact with the rim surface 26 (FIG. 3A). Next, when the other locking portion 47 of the resonator 12 is pushed downward into the mounting groove 29 from above using the plate-shaped tool 61, it abuts against the corner portion of the one holding portion 33 and the one side surface 28. With the one locking portion 47 as a fulcrum, the tip of the other locking portion 47 pivots downward and comes into contact with the corners of the other holding portion 33 and the other side surface 28, whereby the locking portion 47, 47 is held at the corners of the holding portions 33 and 33 and the side surfaces 28 and 28, respectively, so that the air chamber portion 41 is supported by the rim surface 26 (FIG. 3B). In other words, each resonator 12 is retained and retained in the radial direction of the wheel 11 by the elastic force of the engaging portions 47 and 47, and retained and retained in the circumferential direction of the wheel 11 by each communicating portion 37. In this state, each resonator 12 is attached to the wheel 11 with the longitudinal direction along the circumferential direction of the wheel 11 and with both side directions perpendicular to the longitudinal direction along the width direction of the wheel 11.

  The method of attaching the resonator 12 to the wheel 11 is not limited to this attachment means, and is not limited as long as the attachment means does not impair the performance of the resonator 12.

  Here, when the resonator 12 is attached to a wheel 11 having a rim diameter of 18 inches, for example, the resonator main body 36 is curved in advance along the curvature of the rim surface 26 of the wheel 11 having a rim diameter of 18 inches. The resonator 12 can be mounted along the rim surface 26 without any substantial gap by simply mounting without modification. Further, when the resonator 12 is attached to a wheel having a larger rim diameter (for example, 19 inches), or to the wheel 11 having a smaller rim diameter (for example, 17 inches), the resonator body 36 is formed at the time of molding. A wheel with a curvature smaller (larger or smaller radius of curvature) than the curved shape when the resonator 12 (resonator body 36) is molded with a size (rim diameter) different from the size of the wheel 11 to be matched (rim diameter) When the rim surface 26 is attached to the 11 rim surfaces 26, the locking portions 47, 47 on both sides of each air chamber portion 41 are pushed into the mounting groove 29 and held at the corners of the holding portions 33, 33 and the side surfaces 28, 28. As a result, the shape of the resonator body 36 is regulated by these corners, and the hinge portions 42 follow and deform, and the curvature (curvature radius) of the resonator body 36 as a whole changes. Luo size together also curved with respect to the rim surface 26 of the (rim diameter) is different wheel 11 can be mounted without any gap (FIG. 2 (a) and Figure 2 (b)).

  A tire (not shown) is attached to the wheel 11 to which the resonator 12 is attached, so that an air chamber 25 is defined between the wheel 11 and the tire, and the auxiliary air chamber 44 of each resonator 12 is provided in the air chamber 25. Communicate with each other via the communication part 37. Therefore, each resonator 12 functions as a Helmholtz resonance sound absorber, which effectively contributes to the air column resonance generated by the vibration of the air in the air chamber 25 caused by the random vibration transmitted from the road surface to the tire, which contributes to in-vehicle noise. To reduce.

  In this way, when the resonator 12 is locked to the plurality of wheels 11 of different sizes by the locking portions 47, 47 on both sides, the resonator body 36 can be deformed along the outer periphery of the wheel 11. Compared with manufacturing different types of resonators corresponding to each size of the wheel 11, the 42 can follow and deform with high accuracy and can be used to handle different sizes of wheels 11 with one type of resonator 12. Manufacturing costs can be reduced.

  Further, since one type of resonator 12 can be used for a plurality of sizes of wheels 11, parts costs, tool costs for installation, and parts management costs can be further reduced, and it can also be used for low-priced vehicles. be able to.

  In addition, the auxiliary air chamber 44 is provided inside, and the plurality of air chamber portions 41 each provided with locking portions 47, 47 on both sides are connected to each other by the hinge portion 42, so that they are separated by the hinge portion 42. In addition, each air chamber portion 41 can be fixed to the wheel 11 by the locking portions 47 and 47 alone, and compared with a case where one sub air chamber is formed in a longitudinal shape along the longitudinal direction of the resonator body. Thus, since the longitudinal dimension of each auxiliary air chamber 44 can be relatively shortened, the rotation of the wheel 11 is less susceptible to the centrifugal force generated in the radial direction of the wheel 11, that is, in the thickness direction of the resonator 12. Therefore, the resonator 12 can be more firmly fixed to the wheel 11, and deformation of each auxiliary air chamber 44 (each air chamber portion 41) due to the centrifugal force caused by the rotation of the wheel 11 can be suppressed. As a result, the resonance frequency of the resonator 12 set as a function of the capacity of each auxiliary air chamber 44 is stabilized, that is, the change in the sound absorption characteristics due to this deformation can be suppressed with a simple configuration, and stable sound absorption performance can be exhibited. . For example, each auxiliary air chamber 44 (each air chamber portion 41) is not easily deformed even when a load is applied to the resonator 12 due to centrifugal force during high-speed traveling, so that stable sound absorbing performance can be exhibited.

  Furthermore, in the case where one auxiliary air chamber is formed in a longitudinal shape along the longitudinal direction of the resonator body, the capacity of the auxiliary air chamber may change due to deformation. Even if the resonator 12 is attached to a wheel 11 of a different size, even if the resonator 42 is attached, the sound of the resonance frequency substantially as designed is absorbed. it can.

  Further, a communication portion 37 that communicates each auxiliary air chamber 44 with the air chamber 25 is provided on one side of the resonator main body 36, and the resonator main body 36 is positioned in the circumferential direction of the wheel 11 by these communication portions 37, so that the resonator 12 The resonator 12 can be easily fixed in the circumferential direction without using a separate stopper or the like, and can be made less susceptible to the centrifugal force generated by the rotation of the wheel 11.

  Moreover, since the resonance frequency can be easily changed simply by changing the length of the communication part 37, the length of the communication part 37 is adjusted during the cutting process of the tip part of the communication part 37, which is a process that must be performed after molding. By doing so, it is possible to arbitrarily set a frequency that can cope with noise reduction. Therefore, in general, when the size of the wheel 11 is different, the frequency to be silenced is also different, but in the resonator 12, the resonance frequency can be changed by adjusting the length of the communication portion 37. On the other hand, by changing the length of the communication portion 37 of the common resonator 12, it is possible to cope with a sufficient silent effect.

  Note that, in the first embodiment described above, four or more than four air chamber portions 41 (sub air chambers 44) may be provided as in the second embodiment shown in FIG.

  Further, as in the third embodiment shown in FIG. 6, the hinge portion 42 is opposed to the rim surface 26 with the upper side, which is opposite to the side facing the rim surface 26, being substantially flush with the extending portion 46. The lower side to be formed may be formed in a thin shape, or the upper side opposite to the side facing the rim surface 26 is recessed in a groove shape as in the fourth embodiment shown in FIG. It may be thin, or it may be a shape that bulges upward in an arc shape like the fifth embodiment shown in FIG. 8, or like the sixth embodiment shown in FIG. It is good also as a shape which bulges in a triangle shape to the upper side. That is, the shape of the hinge portion 42 can be arbitrarily set as long as it can be molded from a synthetic resin and can be easily deformed.

  In each of the above embodiments, the sub air chambers 44 of the resonators 12 may be set to have different capacities. In this case, each auxiliary air chamber 44 functions as a Helmholtz resonance sound absorber having a different resonance frequency together with each communication portion 37, so that noises at a plurality of frequencies can be effectively reduced.

  In addition, the resonator main body 36 is configured by connecting a plurality of air chamber portions 41 each having an independent sub air chamber 44 by a hinge portion 42. For example, the resonator main body 36 is connected to the air chamber portion 41 having one sub air chamber 44. One or more easily deformable parts such as the hinge part 42 may be provided.

  The present invention can be applied to a resonator that is arranged in an air chamber of a wheel of an automobile or the like to reduce noise caused by resonance.

11 wheel
12 Resonator
25 Air chamber
36 Resonator body
37 Communication part
41 Air chamber
42 Hinge which is an easily deformable part
44 Secondary air chamber
47 Locking part

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,
A resonator body having a longitudinal direction along the circumferential direction of the wheel, providing a secondary air chamber therein, and provided with locking portions locked to the wheel on both sides,
Provided in the resonator main body, comprising a communication portion that communicates the auxiliary air chamber with the air chamber,
The resonator main body includes an easily deformable portion that can deform the resonator main body along the outer periphery of the wheel. The resonator body has a plurality of air chamber portions in the longitudinal direction, each provided with a sub air chamber inside, and a locking portion on each side.
The resonator according to claim 1, wherein the easily deformable portion connects the air chamber portions to each other. The resonator according to claim 1 or 2, wherein the communication portion is provided on one side of the resonator main body, and the resonator main body is positioned in a circumferential direction of the wheel.

Images