JP6227448B2 - Resonator - Google Patents

Resonator Download PDF

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JP6227448B2
JP6227448B2 JP2014049268A JP2014049268A JP6227448B2 JP 6227448 B2 JP6227448 B2 JP 6227448B2 JP 2014049268 A JP2014049268 A JP 2014049268A JP 2014049268 A JP2014049268 A JP 2014049268A JP 6227448 B2 JP6227448 B2 JP 6227448B2
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resonator
plate portion
longitudinal direction
wheel
bottom plate
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JP2015171875A (en
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幸司 石川
幸司 石川
陽二郎 米山
陽二郎 米山
敬亮 杉山
敬亮 杉山
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Nihon Plast Co Ltd
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Nihon Plast Co Ltd
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Description

本発明は、タイヤとこのタイヤが取り付けられたホイールとの間の空気室に配置されて騒音を低減するレゾネータに関する。   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.

従来、金属製のホイールにゴム製のタイヤを装着した車輪について、路面からタイヤに伝わるランダムな振動がホイールとタイヤとの間の空気室の空気を振動させ、空気室の気柱共鳴周波数付近で共鳴現象(空洞共鳴)を生じさせ、気柱共鳴音とも呼ばれる騒音が発生する現象が知られている。そして、この騒音を低減するため、筒状の連通部を介して空気室に連通する副気室を内部に区画し、連通部及び副気室によってヘルムホルツ共鳴吸音器として機能するレゾネータ(共鳴器)がある。   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 There is.

このようなレゾネータは、一般にブロー成形により製造される。すなわち、ダイスから供給された溶融樹脂を成形型間に挟み、ブローピンによって成形型内に空気を吹き込んで溶融樹脂をキャビティに密着させることで、副気室を内部に区画するレゾネータ本体を成形するとともに、成形型により挟まれた両側部が、ホイールのリム面に対向する保持部に係止される板状の係止部となる(例えば、特許文献1参照。)。   Such a resonator is generally manufactured by blow molding. That is, by sandwiching the molten resin supplied from the die between the molds and blowing the air into the mold using blow pins, the molten resin is brought into close contact with the cavity, thereby forming the resonator body that partitions the sub air chamber inside. The both side portions sandwiched between the molding dies serve as plate-like locking portions that are locked to the holding portions facing the rim surface of the wheel (see, for example, Patent Document 1).

このレゾネータの場合、両側に位置する板状の係止部によってホイールに対して係止するため、走行時の遠心力などに対して係止を確実に維持できるように、例えば板厚を大きくする必要がある。また、成形型の合わせ面すなわちパーティング面が係止部の先端部に位置するため、これら係止部の先端部にバリが生じるので、レゾネータをホイールに取り付ける際にバリが剥がれてホイールとレゾネータとの間に挟まらないようにするために、取り付け前に予めバリを高精度に除去するとともに、寸法検査などを行う必要がある。   In the case of this resonator, since it is locked to the wheel by the plate-like locking portions located on both sides, for example, the plate thickness is increased so that the locking can be reliably maintained against the centrifugal force during traveling. There is a need. In addition, since the mating surface of the mold, that is, the parting surface is located at the tip of the locking part, burrs are generated at the tip of the locking part. It is necessary to remove the burrs with high accuracy in advance and to perform dimension inspection and the like before the attachment.

この点、レゾネータ本体の両側部に延出した係止部を、副気室の一部を区画する中空状とすることで、係止部の強度を向上するとともに、成形型のパーティング面を係止部の保持部に接触しない位置とすることで、バリの高精度な除去作業や寸法検査作業を削減し、製造コストを抑制した構成が知られている(例えば、特許文献2参照。)。   In this respect, the locking portions extending on both sides of the resonator main body are made hollow so as to define a part of the auxiliary air chamber, thereby improving the strength of the locking portion and improving the parting surface of the molding die. A configuration is known in which a high-precision removal operation and dimensional inspection operation of burrs are reduced and manufacturing costs are suppressed by setting the position so as not to contact the holding portion of the locking portion (for example, see Patent Document 2). .

しかしながら、このレゾネータの場合、係止部を中空状として強度を向上したので、保持部間に圧入する際に係止部が変形しにくく、取り付けに大きな力を要する。   However, in the case of this resonator, since the strength is improved by making the locking portion hollow, the locking portion is not easily deformed when press-fitted between the holding portions, and a large force is required for mounting.

特開2010−149363号公報 (第4−6頁、図1−4)JP 2010-149363 A (page 4-6, FIG. 1-4) 特開2012−45971号公報 (第4頁、図7−9)JP 2012-45971 A (Page 4, FIGS. 7-9)

上述したように、製造コストを抑制しながら、ホイールに対して容易に取り付けでき、かつ、確実に係止できるレゾネータが望まれている。   As described above, there is a demand for a resonator that can be easily attached to the wheel and can be reliably locked while suppressing the manufacturing cost.

本発明は、このような点に鑑みなされたもので、製造コストを抑制しつつ、ホイールに対する取り付けの作業性が良好で、かつ、ホイールに対して確実に係止できるレゾネータを提供することを目的とする。   The present invention has been made in view of the above points, and an object thereof is to provide a resonator that can be attached to a wheel with good workability and can be reliably locked to the wheel while suppressing the manufacturing cost. And

請求項1記載のレゾネータは、タイヤとこのタイヤが取り付けられたホイールとの間の空気室に配置されて騒音を低減するレゾネータであって、前記ホイールの周方向に沿って長手方向を有し、内部に副気室を設けたレゾネータ本体と、このレゾネータ本体に設けられ、前記副気室を前記空気室と連通させる連通部とを具備し、前記レゾネータ本体は、前記ホイールのリム面に対向する底板部と、この底板部に対して前記リム面と反対側に離間された上板部と、これら底板部と上板部とを両側部で連結してこれら底板部及び上板部とともに前記副気室を区画し、かつ、両側部に延出して前記リム面に対向する保持部に係止される係止部と、前記底板部の少なくともいずれかの側部に設けられた凹部とを備え、前記連通部は、前記レゾネータ本体の長手方向の少なくともいずれかの端部に、前記上板部に対して一部が略面一となるように前記長手方向に沿って設けられ、前記凹部を除く前記底板部及び前記上板部の位置で前記レゾネータ本体の長手方向に沿ってパーティング面を有する成形型を用いてブロー成形されているものである。 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 therein, and a communication portion provided in the resonator main body for communicating the sub air chamber with the air chamber, the resonator main body facing the rim surface of the wheel. A bottom plate portion, an upper plate portion spaced away from the rim surface with respect to the bottom plate portion, and the bottom plate portion and the upper plate portion are connected to each other at both sides, and the sub plate portion and the upper plate portion together with the sub plate portion and the upper plate portion. A locking portion that divides the air chamber and extends to both sides and is locked to a holding portion facing the rim surface, and a recess provided on at least one side of the bottom plate portion , the communication unit, the resonator present Of at least one of the ends of the longitudinal direction, the part with respect to the upper plate portion is provided along the longitudinal direction so as to be substantially flush, the bottom plate portion and the upper plate portion except the recess In this position, blow molding is performed using a mold having a parting surface along the longitudinal direction of the resonator body.

請求項2記載のレゾネータは、請求項1記載のレゾネータにおいて、凹部は、レゾネータ本体の長手方向と交差する方向に沿って、この長手方向に間欠的に複数設けられたものである。   According to a second aspect of the present invention, in the resonator according to the first aspect, a plurality of recesses are provided intermittently in the longitudinal direction along a direction intersecting with the longitudinal direction of the resonator body.

請求項3記載のレゾネータは、請求項2記載のレゾネータにおいて、係止部は、レゾネータ本体の長手方向に凹部とずれた位置にそれぞれ設けられたものである。   According to a third aspect of the present invention, in the resonator according to the second aspect, the locking portion is provided at a position shifted from the concave portion in the longitudinal direction of the resonator main body.

求項記載のレゾネータは、請求項1ないし3いずれか一記載のレゾネータにおいて、上板部及びこの上板部に対して一部が略面一な連通部に亘って連続しレゾネータ本体の長手方向に沿って溝部が設けられたものである。 Resonator of Motomeko 4 described in claims 1 to 3 resonator of any one described, the upper plate portion and the continuous resonator body part over substantially flush of communicating portion with respect to the upper plate portion Grooves are provided along the longitudinal direction.

請求項1記載のレゾネータによれば、凹部を除く底板部及び上板部の位置でレゾネータ本体の長手方向に沿ってパーティング面を有する成形型を用いてブロー成形することで、パーティング面に形成されるバリが、底板部及び上板部の両側部に延出する係止部に形成されず、バリの高精度な除去工程及び寸法検査工程などが不要となり、製造コストを抑制できる。底板部の少なくともいずれかの側部に凹部を設けたので、保持部間に取り付ける際の底板部の保持部への係りを抑制でき、ホイールに対する取り付けの作業性が向上する。係止部は、底板部及び上板部とともに副気室を区画する中空状なので、強度を確保でき、ホイールの保持部に対して確実に係止できる。レゾネータ本体の長手方向の少なくともいずれかの端部に、上板部に対して一部が略面一となるように連通部を長手方向に沿って設けることで、ホイールの回転により生じる遠心力を有効に利用して副気室に入り込んだ水分を上板部に沿って連通部を介して空気室へと確実に排出できるAccording to the resonator of claim 1, the parting surface is formed by blow molding using a mold having a parting surface along the longitudinal direction of the resonator main body at the position of the bottom plate portion and the upper plate portion excluding the concave portion. The formed burrs are not formed on the engaging portions extending on both sides of the bottom plate portion and the upper plate portion, and a high-precision removal step and dimensional inspection step of the burrs are not required, and the manufacturing cost can be suppressed. Since the concave portion is provided on at least one of the side portions of the bottom plate portion, it is possible to suppress the engagement of the bottom plate portion to the holding portion when attaching between the holding portions, and the workability of attachment to the wheel is improved. Since the locking portion is a hollow shape that divides the auxiliary air chamber together with the bottom plate portion and the upper plate portion, the strength can be secured and the locking portion can be reliably locked to the wheel holding portion . At least one end in the longitudinal direction of the resonator main body is provided with a communication portion along the longitudinal direction so that a part thereof is substantially flush with the upper plate portion, so that the centrifugal force generated by the rotation of the wheel is generated. Water that has been effectively utilized and has entered the auxiliary air chamber can be reliably discharged to the air chamber along the upper plate portion via the communicating portion .

請求項2記載のレゾネータによれば、請求項1記載のレゾネータの効果に加え、凹部をレゾネータ本体の長手方向と交差する方向に沿って、この長手方向に間欠的に複数設けることで、これら凹部によって底板部の面剛性を向上できる。そこで、例えば高速走行時であっても安定した状態でホイールに確実に係止できる。   According to the resonator according to claim 2, in addition to the effect of the resonator according to claim 1, by providing a plurality of recesses intermittently in the longitudinal direction along the direction intersecting the longitudinal direction of the resonator main body, Thus, the surface rigidity of the bottom plate portion can be improved. Therefore, for example, even when traveling at high speed, the wheel can be reliably locked in a stable state.

請求項3記載のレゾネータによれば、請求項2記載のレゾネータの効果に加え、係止部をレゾネータ本体の長手方向に凹部とずれた位置にそれぞれ設けることで、係止部の位置での薄肉化をより確実に抑制でき、係止部によってホイールに対してより確実に係止できる。   According to the resonator of the third aspect, in addition to the effect of the resonator of the second aspect, the locking portion is provided at a position shifted from the concave portion in the longitudinal direction of the resonator main body, so that the thin wall at the position of the locking portion is provided. Can be more reliably suppressed, and can be more reliably locked to the wheel by the locking portion.

求項記載のレゾネータによれば、請求項1ないし3いずれか一記載のレゾネータの効果に加え、上板部及びこの上板部に対して一部が略面一な連通部に亘って連続する溝部をレゾネータ本体の長手方向に沿って設けることで、ホイールの回転により生じる遠心力をより有効に利用して副気室に入り込んだ水分を溝部に集め、上板部に沿って連通部を介して空気室へと確実に排出できる。 According to the resonator of Motomeko 4, in addition to claims 1 to 3 Effect of the resonator of any one described, over the upper plate portion and the communicating portion part is substantially flush with respect to the upper plate portion By providing continuous grooves along the longitudinal direction of the resonator body, water that has entered the secondary air chamber is collected more effectively using the centrifugal force generated by the rotation of the wheel, and the communication section is connected along the upper plate. It can be reliably discharged to the air chamber via

本発明のレゾネータの第1の関連技術を示し、(a)はレゾネータを上方から示す斜視図、(b)はレゾネータを下方から示す斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS The 1st related technique of the resonator of this invention is shown, (a) is a perspective view which shows a resonator from upper direction, (b) is a perspective view which shows a resonator from the downward direction. 同上レゾネータの一部を拡大して示す断面図である。It is sectional drawing which expands and shows a part of resonator same as the above. 同上レゾネータのホイールへの取り付け作業を(a)(b)の順に示す断面図である。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). 同上レゾネータの成形手順を(a)ないし(e)の順に模式的に示す説明図である。It is explanatory drawing which shows typically the formation procedure of a resonator same as the above in order of (a) thru | or (e). 同上レゾネータを取り付けたホイールを示す斜視図である。It is a perspective view which shows the wheel which attached the resonator same as the above. 本発明のレゾネータの第2の関連技術を示す斜視図である。It is a perspective view which shows the 2nd related technique of the resonator of this invention. 本発明のレゾネータの第3の関連技術を示す斜視図である。It is a perspective view which shows the 3rd related technique of the resonator of this invention. 本発明のレゾネータの第の実施の形態を示す斜視図である。 1 is a perspective view showing a first embodiment of a resonator according to the present invention. (a)は図8の横断面図、(b)は図8の縦断面図である。(A) is the cross-sectional view of FIG. 8, (b) is the longitudinal cross-sectional view of FIG. 本発明のレゾネータの第の実施の形態を示す断面図である。It is sectional drawing which shows 2nd Embodiment of the resonator of this invention.

以下、本発明のレゾネータの第1の関連技術を図面を参照して説明する。 The first related art of the resonator of the present invention will be described below with reference to the drawings.

図1ないし図5において、10はホイール装置で、このホイール装置10は、金属製のホイール11と、このホイール11に周方向にそれぞれ取り付けられた例えば複数のレゾネータ12とを備えたレゾネータホイールとも呼び得るもので、このホイール装置10にゴム製の図示しないタイヤを装着することにより、自動車の車輪が構成されている。   1 to 5, 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.

そして、このホイール11は、リム部16と、このリム部16の内側に位置する図示しないハブ部と、これらリム部16とハブ部とを連結するディスク部18とを備えている。そして、リム部16には、ホイール11の幅方向の両端部に沿って形成された図示しないビードシート部と、これらビードシート部のさらに外端側からホイール11の径方向の外側に突設された図示しないリムフランジ部と、ビードシート部同士の間に位置してホイール11の径方向の内側に向かって凹設されたウェル部23とが設けられている。そして、ビードシート部に、タイヤのビード部を装着することにより、ホイール11のリム部16とタイヤとに囲まれて、環状の密閉空間である所定の容積の空気室25が構成されている。なお、リム部16のウェル部23は、タイヤをリム部16に組み付ける際に、タイヤのビード部を一旦落とし込むために設けられている。また、このウェル部23の底部であるリム面26には、各レゾネータ12が取り付けられる。   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 (not shown) 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 in the radial direction of the wheel 11. A rim flange portion (not shown) and a well portion 23 which is located between the bead seat portions and is recessed toward the inner side in the radial direction of the wheel 11 are provided. By mounting the bead portion of the tire on the bead seat portion, an air chamber 25 having a predetermined volume, which is an annular sealed space, is configured by being 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.

そして、このウェル部23のリム面26には、ホイール11の径方向に沿って側部保持面としての側面28,28が立ち上げられ、これら側面28,28とリム面26とにより、レゾネータ取付部としての取付溝部29が形成されている。側面28,28の上端部には、リム面26に対向するように折り返された保持部33,33が突設されて、例えばホイール11の全周に亘って連続している。すなわち、保持部33,33は、リム面26に対して離間された位置でこのリム面26の上方に位置している。   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.

各レゾネータ12は、ホイールレゾネータとも呼び得るもので、合成樹脂を用いてブロー成形により一体成形され、円弧状に湾曲されたレゾネータ本体36と、このレゾネータ本体36に突設された連通部37とを備え、全体として円筒状で、かつ、所定の円弧に沿って湾曲し、両側方向に線対称な形状となっている。   Each resonator 12 can also be called a wheel resonator, and includes a resonator main body 36 that is integrally molded by blow molding using a synthetic resin and curved in an arc shape, and a communication portion 37 that protrudes from the resonator main body 36. It has a cylindrical shape as a whole, is curved along a predetermined arc, and is symmetrical with respect to both sides.

レゾネータ本体36は、ホイール11の周方向に沿って長手方向を有する長手状に形成されている。このレゾネータ本体36は、リム面26と対向してこのリム面26と接触する底板部41と、この底板部41の上方(反リム面26側)に離間されて対向する上板部42と、これら底板部41と上板部42との長手方向に沿う両側部をそれぞれ連結する係止部43と、底板部41と上板部42との長手方向の両端部を連結する連結部44とを一体に備え、これら底板部41、上板部42、各係止部43及び各連結部44により、内部に副気室45を区画する中空状となっている。そして、各係止部43が各保持部33に保持されてレゾネータ12全体が取付溝部29に収容されることにより、このレゾネータ12がホイール11に対して固定されるようになっている。なお、以下、長手方向とは、レゾネータ本体36の長手方向を言うものとし、両側方向(短手方向)とは、レゾネータ本体36の長手方向と直交する方向を言うものとする。   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 has a bottom plate portion 41 that faces the rim surface 26 so as to face the rim surface 26, and an upper plate portion 42 that is spaced above and opposite the bottom plate portion 41 (on the side of the rim surface 26). An engaging portion 43 that connects both side portions of the bottom plate portion 41 and the upper plate portion 42 along the longitudinal direction, and a connecting portion 44 that connects both end portions of the bottom plate portion 41 and the upper plate portion 42 in the longitudinal direction. The bottom plate portion 41, the upper plate portion 42, the locking portions 43, and the connecting portions 44 form a hollow shape that divides the auxiliary air chamber 45 therein. Each of the locking portions 43 is held by each holding portion 33 and the entire resonator 12 is accommodated in the mounting groove 29, whereby the resonator 12 is fixed to the wheel 11. Hereinafter, the longitudinal direction refers to the longitudinal direction of the resonator body 36, and the both-side direction (short direction) refers to the direction orthogonal to the longitudinal direction of the resonator body 36.

底板部41は、長手方向と直交する断面が全体としてリム面26へと向かう下方に凸状に膨出するようにU字状になだらかに(急峻に屈曲することなく)湾曲して形成されている。この底板部41は、両側部41a,41aから中央部41bに向けて徐々に下方に突出しているとともに、両側部41a,41aの曲率が中央部41bの曲率よりも大きくなっている。また、この底板部41は、上板部42よりも幅広に形成されており、両側部41a,41aが上板部42に対して側方に突出している。また、この底板部41の両側部41a,41aには、長手方向と交差(直交)する方向に沿って、凹部47,47が、長手方向に複数、間欠的に設けられている。すなわち、底板部41の各側部41aは、凹部47と非凹部48とが長手方向に略等間隔で交互に並んでいる。   The bottom plate portion 41 is formed so as to be gently curved (not sharply bent) in a U shape so that a cross section perpendicular to the longitudinal direction bulges downward toward the rim surface 26 as a whole. Yes. The bottom plate portion 41 gradually protrudes downward from the side portions 41a and 41a toward the central portion 41b, and the curvature of the side portions 41a and 41a is larger than the curvature of the central portion 41b. The bottom plate portion 41 is formed wider than the upper plate portion 42, and both side portions 41a and 41a protrude laterally with respect to the upper plate portion 42. Further, a plurality of recesses 47, 47 are provided intermittently in the longitudinal direction on both side portions 41a, 41a of the bottom plate portion 41 along a direction intersecting (orthogonal) with the longitudinal direction. That is, in each side portion 41a of the bottom plate portion 41, the concave portions 47 and the non-concave portions 48 are alternately arranged at substantially equal intervals in the longitudinal direction.

各凹部47は、上端部が各係止部43の下端部と連続する第1の曲面部としての上部湾曲部47aと、この上部湾曲部47aの下端部になだらかに連続する第2の曲面部としての下部湾曲部47bとを一体に備えている。そして、底板部41の両側部41a,41aに位置する凹部47,47は、両側方向に互いに対向する位置、すなわち長手方向に略一致する位置となっている。   Each concave portion 47 includes an upper curved portion 47a as a first curved surface portion whose upper end portion is continuous with the lower end portion of each locking portion 43, and a second curved surface portion that is gently continuous with the lower end portion of the upper curved portion 47a. And a lower curved portion 47b as a single unit. And the recessed parts 47 and 47 located in the both sides 41a and 41a of the baseplate part 41 are the positions which mutually oppose in a both-sides direction, ie, the position which substantially corresponds to a longitudinal direction.

上部湾曲部47aは、両側方向の断面で見て、係止部43の背面側である下側に入り込むように湾曲している。すなわち、この上部湾曲部47aは、両側方向の中央部に向けてリム面26へと接近する下方へと傾斜するように湾曲している。また、この上部湾曲部47aは、上方に凸状に膨出する曲面の一部をなすように形成され、下部湾曲部47bに対して、湾曲の向きが反対となっている。このため、各凹部47は、底板部41(側部41a)に対して、上端部及び下端部から、上部湾曲部47aと下部湾曲部47bとの連続部に向けて徐々に深くなるように形成されている。   The upper curved portion 47a is curved so as to enter the lower side, which is the back side of the locking portion 43, when viewed in the cross section in both side directions. That is, the upper curved portion 47a is curved so as to incline downward toward the rim surface 26 toward the central portion in both side directions. Further, the upper curved portion 47a is formed so as to form a part of a curved surface that bulges upward in a convex shape, and the bending direction is opposite to that of the lower curved portion 47b. Therefore, each concave portion 47 is formed so as to be gradually deeper from the upper end portion and the lower end portion toward the continuous portion of the upper curved portion 47a and the lower curved portion 47b with respect to the bottom plate portion 41 (side portion 41a). Has been.

下部湾曲部47bは、底板部41の中央部41bへとなだらかに連続するようにリム面26へと向かう下方へと凸状に膨出するようにU字状に湾曲している。この下部湾曲部47bは、例えば反対側の係止部43を中心とした円弧に沿って形成されており、底板部41の両側部41a,41aよりも曲率が大きく(曲率半径が小さく)なっている。   The lower curved portion 47b is curved in a U shape so as to bulge downward toward the rim surface 26 so as to continue smoothly toward the central portion 41b of the bottom plate portion 41. The lower curved portion 47b is formed along, for example, an arc centered on the opposite locking portion 43, and has a larger curvature (a smaller radius of curvature) than both side portions 41a and 41a of the bottom plate portion 41. Yes.

上板部42は、長手方向と直交する断面が全体としてリム面26と反対側である上方に凸状に膨出するように逆U状に湾曲して形成されている。すなわち、この上板部42は、両側部42a,42aから中央部42bに向けて徐々に上方に突出しているとともに、両側部42a,42aの曲率が中央部42bの曲率よりも大きくなっている。   The upper plate portion 42 is formed in a curved shape in an inverted U shape so that a cross section perpendicular to the longitudinal direction bulges upward upward, which is opposite to the rim surface 26 as a whole. That is, the upper plate portion 42 gradually protrudes upward from the side portions 42a and 42a toward the central portion 42b, and the curvature of the side portions 42a and 42a is larger than the curvature of the central portion 42b.

各係止部43は、底板部41及び上板部42から側方に延出しており、本関連技術ではレゾネータ本体36の両側部に沿って長手方向に連続する長手状に形成されている。これら係止部43は、底板部41及び凹部47と連続する第1の壁部としての縦壁部43aと、この縦壁部43a及び上板部42と連続する第2の壁部としての当接面である横壁部43bとをそれぞれ備えている。そして、各係止部43の横壁部43bが各保持部33の背面側、すなわちリム面26に対向する下面に当接することでレゾネータ12が上方に抜け止めされ、各保持部33間に係止されるようになっている。 Each locking portion 43 extends laterally from the bottom plate portion 41 and the upper plate portion 42 and is formed in a longitudinal shape that is continuous in the longitudinal direction along both side portions of the resonator main body 36 in this related technology . These locking portions 43 are a vertical wall portion 43a as a first wall portion continuous with the bottom plate portion 41 and the concave portion 47, and a second wall portion as a second wall portion continuous with the vertical wall portion 43a and the upper plate portion 42. And a horizontal wall 43b which is a contact surface. The horizontal wall 43b of each locking portion 43 abuts on the back side of each holding portion 33, that is, the lower surface facing the rim surface 26, so that the resonator 12 is prevented from coming off upward and locked between the holding portions 33. It has come to be.

各縦壁部43aは、各係止部43の最も外側の側部を構成するものであり、レゾネータ12をホイール11に取り付けた状態で各側面28に離間されて対向する部分である。これら縦壁部43aは、上端部が、長手方向と直交する断面が円弧状に湾曲した第1の連結部としての上部連結部43cを介して横壁部43bと連続しており、下端部が、底板部41の側部41aに対してなだらかに連続しているとともに、各凹部47の上部湾曲部47aに対して長手方向と直交する断面が円弧状に湾曲した第2の連結部としての下部連結部43dを介して連続している。そして、これら縦壁部43aの上下寸法L1は、各係止部43の剛性を確保するために可能最大寸法に設定されている。   Each vertical wall portion 43a constitutes the outermost side portion of each locking portion 43, and is a portion facing and spaced apart from each side surface 28 with the resonator 12 attached to the wheel 11. These vertical wall parts 43a are continuous with the horizontal wall part 43b through the upper connecting part 43c as the first connecting part whose upper end part is curved in an arc shape in a cross section orthogonal to the longitudinal direction, and the lower end part is A lower connection as a second connection portion that is gently continuous with the side portion 41a of the bottom plate portion 41 and has a cross section orthogonal to the longitudinal direction curved in an arc shape with respect to the upper curved portion 47a of each recess 47 It is continuous via the part 43d. The vertical dimension L1 of these vertical wall portions 43a is set to the maximum possible dimension in order to ensure the rigidity of each locking portion 43.

上部連結部43cは、ホイール11の保持部33とのラップ量を考慮した可能最小半径に形成されている。   The upper connecting portion 43c is formed to have the smallest possible radius considering the amount of lap with the holding portion 33 of the wheel 11.

下部連結部43dは、ホイール11への取り付け性(組み付け性)を向上するために、可能最大半径に形成されている。したがって、この下部連結部43dは、上部連結部43cよりも大きい半径寸法を有する曲面状となっている。   The lower connecting portion 43d is formed to have the maximum possible radius in order to improve the attachment property (assembly property) to the wheel 11. Therefore, the lower connecting portion 43d has a curved surface shape having a larger radial dimension than the upper connecting portion 43c.

各横壁部43bは、各係止部43の最も上側の部分を構成するものであり、長手方向と交差(直交)する、すなわちリム面26と略平行な方向に沿って平面状となっている。これら横壁部43bは、外側の端部が上部連結部43cを介して縦壁部43aの上端部と連続しており、内側の端部が上板部42の側部42aに対して長手方向と直交する断面が円弧状に湾曲した第3の連結部としての内側連結部43eを介して連続している。そして、これら横壁部43bの短手寸法である突出寸法L2は、各保持部33とのラップ代やクリアランスが考慮された必要最低寸法に形成され、各係止部43の上板部42と連続する上側の形状起伏を緩やかにするようになっている。   Each horizontal wall portion 43b constitutes the uppermost portion of each locking portion 43, and intersects (orthogonal) the longitudinal direction, that is, has a planar shape along a direction substantially parallel to the rim surface 26. . These horizontal wall portions 43b have outer end portions that are continuous with the upper end portions of the vertical wall portions 43a via the upper connecting portions 43c, and inner end portions that are longitudinal with respect to the side portions 42a of the upper plate portion 42. The cross sections orthogonal to each other are continuous via an inner connecting portion 43e as a third connecting portion curved in an arc shape. The projecting dimension L2, which is the short dimension of the horizontal wall part 43b, is formed to the minimum required dimension considering the wrapping allowance and clearance with each holding part 33, and is continuous with the upper plate part 42 of each locking part 43. The shape undulation on the upper side is made gentle.

内側連結部43eは、上部連結部43cの半径寸法に対応して可能最大変形に形成され、係止部43の上板部42と連続する上側の形状起伏を緩やかにするようになっている。この内側連結部43eは、下部連結部43d及び上部連結部43cよりも大きい半径寸法を有する曲面状となっている。   The inner connecting portion 43e is formed to the maximum possible deformation corresponding to the radial dimension of the upper connecting portion 43c, and the upper shape undulation continuous with the upper plate portion 42 of the locking portion 43 is made gentle. The inner connecting portion 43e has a curved surface shape having a larger radial dimension than the lower connecting portion 43d and the upper connecting portion 43c.

各連結部44は、底板部41と上板部42とを長手方向の両端部にて平面状に連結して副気室45の両端部を閉塞している。   Each connecting portion 44 connects the bottom plate portion 41 and the upper plate portion 42 in a planar shape at both ends in the longitudinal direction and closes both ends of the auxiliary air chamber 45.

副気室45は、中空部とも呼ばれ、ホイール11の周方向に沿って長手方向を有する空間である。また、この副気室45は、連通部37以外に外部と連通する通路などを備えていない。   The auxiliary air chamber 45 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, the auxiliary air chamber 45 does not include a passage communicating with the outside other than the communication portion 37.

連通部37は、副気室45を空気室25と連通させるもので、筒状をなし例えばレゾネータ本体36の上板部42の長手方向及び両側方向の中央部にて上方に突設されている。   The communication portion 37 communicates the auxiliary air chamber 45 with the air chamber 25, has a cylindrical shape, and protrudes upward at, for example, the central portion of the upper plate portion 42 of the resonator main body 36 in the longitudinal direction and both side directions. .

そして、空気室25を主気室として、副気室45の容量(体積)や連通部37の長さなどは、ヘルムホルツ共鳴吸音器の共鳴周波数を求める次の式を満たすように設定される。   Then, with the air chamber 25 as the main air chamber, the capacity (volume) of the sub air chamber 45, 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+α×√S))
fo〔Hz〕:空気室25の共鳴周波数
C〔m/s〕:空気室25内部の音速
S〔m〕:レゾネータ12の連通部37の断面積
V〔m〕:レゾネータ12の副気室45の容量
L〔m〕:レゾネータ12の連通部37の長さ
α:補正係数
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 communication part 37 of the resonator 12 V [m 3 ]: sub-air of the resonator 12 Capacity of chamber 45 L [m]: Length of communication portion 37 of resonator 12 α: Correction coefficient

なお、この共鳴周波数foは、空気室25の共鳴周波数に合わせて設定されるが、空気室25に備えられる複数のレゾネータ12について、全てのレゾネータ12を同一の設定とする他、空気室25に複数の共鳴周波数が認められる場合は、それぞれの副気室45と連通する連通部37の長さや断面積を異ならせてもよく、あるいは、空気室25の複数の共鳴周波数の平均値となるように設定することもできる。   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 45 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.

そして、このレゾネータ12は、本関連技術ではブロー成形により製造される。このブロー成形の際には、図4に示す(一及び他の)成形型51,52を用いる。成形型51,52は、閉型状態で互いに突き合わせられる平面状の(一及び他の)パーティング面51a,52aと、レゾネータ12の外殻をなす(一及び他の)成形面51b,52bとを備えており、これらパーティング面51a,52aを突き合わせた状態で成形面51b,52b間に、溶融樹脂であるパリソンPが収容される空間部であるキャビティ53が区画されるようになっている。また、これら成形型51,52のパーティング面51a,52aは、成形面51b,52bの凹部47,47を除く底板部41及び上板部42に対応する位置、本関連技術では、成形面51b,52bの底板部41及び上板部42の中央部41b,42bに対応する位置、すなわち係止部43,43に対して離間された位置となっている。このため、これら成形型51,52は、パーティング面51a,52aにてレゾネータ12の両側方向に互いに略線対称となっている。 The resonator 12 is manufactured by blow molding in this related technology . In this blow molding, the molds 51 and 52 (one and the other) shown in FIG. 4 are used. The molds 51 and 52 are planar (one and other) parting surfaces 51a and 52a that are brought into contact with each other in a closed mold state, and (one and other) molding surfaces 51b and 52b that form an outer shell of the resonator 12. A cavity 53, which is a space in which the parison P that is a molten resin is accommodated, is defined between the molding surfaces 51b and 52b in a state where the parting surfaces 51a and 52a are abutted with each other. . Further, the parting surface 51a of the mold 51 and 52, 52a is shaped surfaces 51b, 52 b position corresponding to the bottom plate portion 41 and the upper plate portion 42 excluding the recessed portion 47, 47, in the related art, the forming surface 51b , 52b and the positions corresponding to the center portions 41b, 42b of the upper plate portion 42, that is, the positions separated from the locking portions 43, 43. For this reason, these molds 51 and 52 are substantially line-symmetric with each other in both directions of the resonator 12 at the parting surfaces 51a and 52a.

そして、例えば図示しないダイスによって上方から下方へと供給された円筒状のパリソンP(図4(a))に対して成形型51,52を閉じることでキャビティ53内にパリソンPをセットする(図4(b))。このとき、パリソンPの一部は、成形型51,52のパーティング面51a,52aにより挟み込まれる。続いて、キャビティ53内のパリソンPの内方に、図示しないブローピンを介して圧縮空気Aを噴射注入する(図4(c))と、キャビティ53内のパリソンPが膨らみ、成形型51,52の成形面51b,52bに押圧されて密着する(図4(d))。このとき、パリソンPは、キャビティ53の中央部、本関連技術ではパーティング面51a,52aの位置から、両側方向に離間されるように成形面51b,52bに対して順次密着していく。したがって、レゾネータ12においては、底板部41及び上板部42の中央部41b,42bの位置でパリソンPが最も厚肉で、キャビティ53の中央部から最も遠い係止部43,43の位置でパリソンPが最も引き延ばされた薄肉の状態となる。 Then, for example, the parison P is set in the cavity 53 by closing the molds 51 and 52 with respect to the cylindrical parison P (FIG. 4A) supplied from above to below by a die (not shown) (FIG. 4). 4 (b)). At this time, part of the parison P is sandwiched between the parting surfaces 51 a and 52 a of the molds 51 and 52. Subsequently, when the compressed air A is injected and injected into the inside of the parison P in the cavity 53 via a blow pin (not shown) (FIG. 4C), the parison P in the cavity 53 swells and the molds 51 and 52 are formed. Are pressed into close contact with the molding surfaces 51b and 52b (FIG. 4D). At this time, the parison P is sequentially brought into close contact with the molding surfaces 51b and 52b so as to be separated from both sides from the center of the cavity 53, that is, the positions of the parting surfaces 51a and 52a in this related technology . Therefore, in the resonator 12, the parison P is thickest at the positions of the central portions 41b and 42b of the bottom plate portion 41 and the upper plate portion 42, and the parison is located at the positions of the locking portions 43 and 43 farthest from the central portion of the cavity 53. P becomes the most stretched thin wall state.

両側方向の断面で見たときの係止部43,43及びその周囲の賦形をより詳細に説明すると、底板部41の両側部41a,41aの各非凹部48の位置では、そのなだらかな傾斜(曲面)に沿ってパリソンPが係止部43,43の縦壁部43aに向かって成形面51b,52bに順次密着した後、各係止部43の縦壁部43aに対して上部連結部43cに向かって下方から密着する。また、底板部41の両側部41a,41aの各凹部47の位置では、下部湾曲部47bから上部湾曲部47aへと、なだらかな傾斜(曲面)に沿ってパリソンPが係止部43,43の縦壁部43aに向かって成形面51b,52bに順次密着した後、各係止部43の縦壁部43aに対して下部連結部43dから上部連結部43cに向かって下方から密着する。このとき、下部連結部43dが可能最大半径に湾曲されているとともに、縦壁部43aの上下寸法L1が可能最大寸法の平面状であるため、特に凹部47によって上下に相対的に狭くなっている位置でもパリソンPが確実に成形面51b,52bに密着する。一方、上板部42の両側部42a,42aの位置では、そのなだらかな傾斜(曲面)に沿ってパリソンPが係止部43,43の横壁部43bに向かって成形面51b,52bに順次密着した後、内側連結部43eから上部連結部43cに向かって横壁部43bに沿ってパリソンPが引き延ばされるように成形面51b,52bに密着する。このとき、内側連結部43eが可能最大半径に湾曲されているとともに、横壁部43bの突出寸法L2が必要最低限となっているため、形状起伏が緩やかなので、成形面51b,52bに沿ってパリソンPが確実に引き延ばされ、局所的な薄肉部が形成されにくく、穴開きなどを生じることなく成形面51b,52bに確実に密着する。   The locking portions 43 and 43 and the surrounding shaping when viewed in a cross section in both directions will be described in more detail. At the positions of the non-recessed portions 48 of the both side portions 41a and 41a of the bottom plate portion 41, the gentle inclination After the parison P is in close contact with the molding surfaces 51b and 52b sequentially toward the vertical wall 43a of the locking portions 43 and 43 along the (curved surface), the upper connecting portion is connected to the vertical wall 43a of each locking portion 43. Close contact toward 43c from below. Further, at the positions of the respective concave portions 47 of the both side portions 41a and 41a of the bottom plate portion 41, the parison P extends from the lower curved portion 47b to the upper curved portion 47a along the gentle slope (curved surface) of the locking portions 43 and 43. After being in close contact with the molding surfaces 51b and 52b sequentially toward the vertical wall 43a, it is in close contact with the vertical wall 43a of each locking portion 43 from the lower connecting portion 43d to the upper connecting portion 43c from below. At this time, the lower connecting portion 43d is curved to the maximum possible radius, and the vertical dimension L1 of the vertical wall portion 43a is a planar shape having the maximum possible dimension, so that it is relatively narrowed vertically by the recess 47 in particular. Even at the position, the parison P securely adheres to the molding surfaces 51b and 52b. On the other hand, at the positions of both side portions 42a and 42a of the upper plate portion 42, the parison P sequentially contacts the molding surfaces 51b and 52b toward the lateral wall portion 43b of the locking portions 43 and 43 along the gentle slope (curved surface). After that, the parison P is in close contact with the molding surfaces 51b and 52b so that the parison P is extended along the horizontal wall portion 43b from the inner coupling portion 43e toward the upper coupling portion 43c. At this time, the inner connecting portion 43e is curved to the maximum possible radius and the projecting dimension L2 of the lateral wall portion 43b is the minimum necessary, so the shape undulation is gentle, so the parison along the molding surfaces 51b and 52b. P is reliably stretched and a local thin portion is not easily formed, and is securely in contact with the molding surfaces 51b and 52b without causing a hole or the like.

この後、成形面51b,52bに密着されたパリソンPが冷却されて硬化することで、中空状の中間体Mが所定の形状で賦形される。そして、この中間体Mを、成形型51,52を開いて脱型し(図4(e))、連通部37の先端部を、上記の共鳴周波数の式に基づいて算出される所定の長さにカットするとともに不要部分であるバリBを除去することで、レゾネータ12が完成する。このバリBの位置は、レゾネータ12をホイール11に組み付ける際に保持部33,33に係止保持される係止部43,43から離間されているため、バリBの除去作業は、必要以上の精度が要求されない簡単なものとなる。   Thereafter, the parison P in close contact with the molding surfaces 51b and 52b is cooled and cured, so that the hollow intermediate body M is shaped in a predetermined shape. Then, the intermediate body M is removed from the molds 51 and 52 by opening the molds 51 and 52 (FIG. 4E), and the tip of the communication part 37 is calculated by a predetermined length calculated based on the above resonance frequency equation. The resonator 12 is completed by cutting the burrs and removing the burrs B which are unnecessary portions. Since the position of the burr B is separated from the locking parts 43 and 43 that are locked and held by the holding parts 33 and 33 when the resonator 12 is assembled to the wheel 11, the removal work of the burr B is more than necessary. It becomes a simple one that does not require accuracy.

これらレゾネータ12をホイール11に組み付ける際には、まず、ホイール11の取付溝部29に対して、一方の係止部43からレゾネータ12を取付溝部29へと傾斜状に挿入し、この一方の係止部43の先端部を一方の保持部33に当接させる(図3(a))。次いで、この一方の保持部33に当接した一方の係止部43を支点として、図示しない治具などを用いてレゾネータ12の底板部41を他方の保持部33に摺動させつつ他方の係止部43側を矢印Xに示す方向に沿って回転させるように取付溝部29内へと下方に押し込む(図3(b))。このとき、他方の保持部33に対向する底板部41の他方の係止部43の背面側の凹部47は、この他方の保持部33に対して干渉しない寸法である(一方の係止部43からの距離が一方の係止部43から他方の保持部33までの距離よりも短い)とともに、他方の係止部43と凹部47とが連続する下部連結部43dを両側方向の断面で見て可能最大半径を有する曲面状としたので、なだらかに湾曲する底板部41と他方の保持部33との当接(摺動)面積が減少し、比較的少ない挿入力で他方の係止部43を他方の保持部33に容易に係止できる。この結果、各レゾネータ12は、係止部43,43が保持部33,33に当接するとともに、底板部41の中央部41bがリム面26に当接することによってホイール11の径方向に対して抜け止め保持される。この状態で、各レゾネータ12は、ホイール11に対して長手方向をホイール11の周方向に沿わせ、かつ、長手方向と直交する両側方向をホイール11の幅方向に沿わせて取り付けられている。   When assembling the resonator 12 to the wheel 11, first, the resonator 12 is inserted into the mounting groove 29 from the one locking portion 43 in an inclined manner with respect to the mounting groove 29 of the wheel 11. The tip of the portion 43 is brought into contact with one holding portion 33 (FIG. 3A). Next, using the one locking portion 43 in contact with the one holding portion 33 as a fulcrum, the bottom plate portion 41 of the resonator 12 is slid on the other holding portion 33 using a jig or the like (not shown) while the other engagement portion 43 is engaged. The stopper 43 is pushed downward into the mounting groove 29 so as to rotate along the direction indicated by the arrow X (FIG. 3B). At this time, the concave portion 47 on the back side of the other locking portion 43 of the bottom plate portion 41 facing the other holding portion 33 has a size that does not interfere with the other holding portion 33 (one locking portion 43 And the lower connecting portion 43d in which the other locking portion 43 and the recess 47 are continuous is seen in a cross section in both directions. Since the curved surface has the maximum possible radius, the contact (sliding) area between the gently curved bottom plate portion 41 and the other holding portion 33 is reduced, and the other locking portion 43 can be moved with a relatively small insertion force. It can be easily locked to the other holding portion 33. As a result, each of the resonators 12 comes off with respect to the radial direction of the wheel 11 by the locking portions 43 and 43 coming into contact with the holding portions 33 and 33 and the central portion 41b of the bottom plate portion 41 coming into contact with the rim surface 26. Stopped and held. 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.

そして、これらレゾネータ12を取り付けたホイール11には、図示しないタイヤが取り付けられることで、ホイール11とタイヤとの間に空気室25が区画され、この空気室25に各レゾネータ12の副気室45がそれぞれ連通部37を介して連通する。そこで、各レゾネータ12がヘルムホルツ共鳴吸音器として機能し、車内騒音の一因ともなる、路面からタイヤに伝わるランダムな振動が空気室25の空気を振動させて発生する気柱共鳴音を効果的に低減する。   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 45 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.

このように、本関連技術によれば、凹部47を除く底板部41及び上板部42の位置でレゾネータ本体36の長手方向に沿ってパーティング面51a,52aを有する成形型51,52を用いてレゾネータ12をブロー成形することで、パーティング面51a,52aに形成されるバリBが、底板部41及び上板部42の両側部に延出する係止部43,43に形成されず、バリの高精度な除去工程及び寸法検査工程などが不要となり、製造タクトの短縮、及び、治具や検具などの作成の必要がなくなるなど、製造コストを抑制できる。 As described above, according to this related technique , the molds 51 and 52 having the parting surfaces 51a and 52a along the longitudinal direction of the resonator main body 36 are used at the positions of the bottom plate portion 41 and the upper plate portion 42 excluding the recess 47. By blowing the resonator 12 in this way, the burrs B formed on the parting surfaces 51a, 52a are not formed on the locking portions 43, 43 extending on both sides of the bottom plate portion 41 and the upper plate portion 42, A high-precision removal process of burrs, a dimension inspection process, and the like are not required, and thus manufacturing costs can be reduced, such as shortening of manufacturing tact and no need to create jigs and inspection tools.

また、底板部41の少なくともいずれかの側部41a、本関連技術では両側部41a,41aに凹部47を設けたので、保持部33,33間にレゾネータ12を取り付ける際の底板部41の保持部33,33への係り(接触面積)を抑制でき、ホイール11に対する取り付けの作業性が向上する。さらに、係止部43,43は、底板部41及び上板部42とともに副気室45を区画する中空状なので、単なる板状の係止部と比較して強度を確保でき、ホイール11の保持部33,33に対して確実に係止できる。 In addition, since the concave portion 47 is provided in at least one of the side portions 41a of the bottom plate portion 41, and both side portions 41a and 41a in this related technology , the holding portion of the bottom plate portion 41 when the resonator 12 is attached between the holding portions 33 and 33. The engagement to 33 and 33 (contact area) can be suppressed, and the workability of attachment to the wheel 11 is improved. Furthermore, since the locking portions 43 and 43 are hollow so as to define the auxiliary air chamber 45 together with the bottom plate portion 41 and the upper plate portion 42, the strength can be ensured as compared with a simple plate-shaped locking portion, and the wheel 11 can be held. It can be securely locked to the parts 33, 33.

また、凹部47をレゾネータ本体36の長手方向と交差する方向に沿って、この長手方向に間欠的に複数設けることで、これら凹部47が補強ビードとして作用するとともに、リム面26に当接する底板部41の中央部41bは、成形型51,52のパーティング面51a,52aに対応する位置であるため、他部分よりも厚肉となることから、擬似的なビードとなり、かつ、底板部41の係止部43,43と連続する両側部41a,41aをなだらかな傾斜(曲面)としたので、成形時の薄肉化を防止できるなど、底板部41の面剛性を向上できる。そこで、例えば高速走行時であってもレゾネータ12を安定した状態でホイール11に確実に係止できる。また、レゾネータ12をホイール11に対して圧入して取り付ける際に底板部41に変形などが生じることもない。   In addition, by providing a plurality of recesses 47 intermittently in the longitudinal direction along the direction intersecting with the longitudinal direction of the resonator body 36, the recess 47 functions as a reinforcing bead and a bottom plate portion that contacts the rim surface 26 Since the central portion 41b of 41 is a position corresponding to the parting surfaces 51a and 52a of the molds 51 and 52, it is thicker than the other portions, so that it becomes a pseudo bead, and the bottom plate portion 41 Since the side portions 41a and 41a that are continuous with the locking portions 43 and 43 have gentle slopes (curved surfaces), the surface rigidity of the bottom plate portion 41 can be improved, such as prevention of thinning during molding. Therefore, for example, the resonator 12 can be reliably locked to the wheel 11 in a stable state even during high-speed traveling. Further, when the resonator 12 is press-fitted into the wheel 11 and attached, the bottom plate portion 41 is not deformed.

特に、各係止部43は、縦壁部43aの上下寸法L1を可能最大寸法の平面状とすることで、成形型51,52への転写性を向上し、意図した製品寸法で各係止部43を形成できるとともに、横壁部43bの突出寸法L2を必要最低限とし、かつ、下部連結部43d及び内側連結部43eをそれぞれ両側方向の断面で見て可能最大半径を有する曲面状として形状の起伏を緩やかとすることにより、成形時の局所的な薄肉化を抑制できるなど、ホイール11に取り付ける際の圧入により変形しない充分な剛性を確保したレゾネータ12を成形できる。   In particular, each locking portion 43 has a vertical dimension L1 of the vertical wall portion 43a that is the largest possible plane, thereby improving transferability to the molds 51 and 52, and each locking size with the intended product dimensions. The portion 43 can be formed, the protruding dimension L2 of the lateral wall portion 43b is minimized, and the lower connecting portion 43d and the inner connecting portion 43e are each formed as a curved surface having the maximum possible radius when viewed in cross section on both sides. By making the undulations gentle, it is possible to mold the resonator 12 that has sufficient rigidity to be prevented from being deformed by press fitting at the time of being attached to the wheel 11, such as suppressing local thinning during molding.

さらに、レゾネータ12を両側方向に線対称とすることで、ホイール11に取り付けた後の製品安定性が向上し、高速走行時などであってもレゾネータ12に作用する遠心力が両側に等しく加わるので、がたつきなどを確実に防止できる。   Furthermore, by making the resonator 12 line symmetrical in both directions, the product stability after mounting on the wheel 11 is improved, and the centrifugal force acting on the resonator 12 is equally applied to both sides even during high-speed driving. , Rattling, etc. can be reliably prevented.

なお、上記の第1の関連技術において、図6に示す第2の関連技術のように、係止部43をレゾネータ本体36の底板部41の両側部41a,41aにてレゾネータ本体36の長手方向に各凹部47とずれた位置にそれぞれ設け、長手方向に間欠的に配置してもよい。この場合には、係止部43,43の位置での薄肉化をより確実に抑制でき、係止部43,43によってレゾネータ12をホイール11に対してより確実に係止できる。 In the first related art described above, as in the second related art shown in FIG. 6, the locking portion 43 is moved in the longitudinal direction of the resonator main body 36 at both side portions 41 a and 41 a of the bottom plate portion 41 of the resonator main body 36. May be provided at positions shifted from the recesses 47 and intermittently arranged in the longitudinal direction. In this case, thinning at the positions of the locking portions 43 and 43 can be more reliably suppressed, and the resonator 12 can be locked to the wheel 11 more reliably by the locking portions 43 and 43.

また、図7に示す第3の関連技術のように、係止部43は、長手方向にさらに間引いてもよい。すなわち、機能上支障がない範囲で、係止部43はそのピッチや数などを適宜設定できる。 Further, as in the third related technique shown in FIG. 7, the locking portion 43 may be further thinned out in the longitudinal direction. That is, the pitch and number of the locking portions 43 can be set as appropriate as long as there is no functional problem.

さらに、エアコンプレッサなどを用いてタイヤに空気を充填した際には、空気と同時に水分も充填され、場合によっては副気室45内に水分が溜まることが考えられる。そこで、図8及び図9に示す第の実施の形態のように、レゾネータ本体36の長手方向の少なくともいずれかの端部、本実施の形態では一方の連結部44に、ホイール11の回転によって最も遠心力が加わる上板部42に対して上部が略面一となるように連通部37を長手方向に沿って設けてもよい。このとき、上板部42及びこの上板部42に対して上部が略面一な連通部37に亘って連続する溝部55をレゾネータ本体36の長手方向に沿って中央部42bに設けるとともに、上板部42を、両側部42a,42aから中央部42bへと溝部55に向かって(上方へと)傾斜させた逆V字状とすることが好ましい。すなわち、連通部37を、レゾネータ本体36のうち、ホイール11の径方向に最大に突出する位置と連通するように形成し、溝部55を、レゾネータ12のうち、リム面26からホイール11の径方向に最も遠い位置に形成することが好ましい。 Further, when the tire is filled with air using an air compressor or the like, moisture is filled simultaneously with the air, and in some cases, moisture may be accumulated in the auxiliary air chamber 45. Therefore, as in the first embodiment shown in FIGS. 8 and 9, at least one end in the longitudinal direction of the resonator main body 36, in this embodiment, one connecting portion 44 is rotated by the rotation of the wheel 11. The communication part 37 may be provided along the longitudinal direction so that the upper part is substantially flush with the upper plate part 42 to which the centrifugal force is applied most. At this time, the upper plate portion 42 and a groove portion 55 that continues to the upper plate portion 42 over the communication portion 37 that is substantially flush with the upper plate portion 42 are provided in the central portion 42b along the longitudinal direction of the resonator body 36, and It is preferable that the plate portion 42 has an inverted V shape that is inclined toward the groove portion 55 (upward) from both side portions 42a, 42a to the central portion 42b. That is, the communication portion 37 is formed so as to communicate with the position of the resonator body 36 that protrudes in the radial direction of the wheel 11 to the maximum, and the groove portion 55 of the resonator 12 from the rim surface 26 to the radial direction of the wheel 11 is formed. It is preferable to form it at the farthest position.

この場合には、ホイール11の回転により生じる遠心力により、副気室45の内部の水分が上板部42に付着するとともに、この上板部42の両側部42a,42aの傾斜に沿って、遠心力が最も作用する中央部42bの溝部55へと確実に集中され、例えば走行時あるいはブレーキ作動時などの減速時に、溝部55を介して連通部37から空気室25へと排出される。すなわち、遠心力を有効に利用して副気室45に入り込んだ水分を上板部42に沿って連通部37を介して空気室25へと確実に排出できる。この結果、副気室45内に水分が溜まることがなく、副気室45の容量の関数として設定されるレゾネータ12の共鳴周波数が安定し、安定した吸音性能を発揮できる。   In this case, due to the centrifugal force generated by the rotation of the wheel 11, moisture inside the auxiliary air chamber 45 adheres to the upper plate portion 42, and along the slopes of both side portions 42a, 42a of the upper plate portion 42, Centrifugal force is surely concentrated on the groove portion 55 of the central portion 42b where it acts most, and is discharged from the communication portion 37 to the air chamber 25 via the groove portion 55, for example, when decelerating during running or braking. That is, the moisture that has entered the auxiliary air chamber 45 by effectively utilizing the centrifugal force can be reliably discharged along the upper plate portion 42 to the air chamber 25 via the communication portion 37. As a result, moisture does not accumulate in the auxiliary air chamber 45, the resonance frequency of the resonator 12 set as a function of the capacity of the auxiliary air chamber 45 is stabilized, and stable sound absorbing performance can be exhibited.

しかも、連通部37は、取付溝部29内に配置されてタイヤと対向しないため、タイヤの脱着時などに誤って傷つけたりすることもない。   In addition, since the communication portion 37 is disposed in the mounting groove 29 and does not face the tire, the communication portion 37 is not accidentally damaged when the tire is attached or detached.

また、上記の第の実施の形態を、上記の第2の関連技術あるいは第3の関連技術と組み合わせてもよい。 Further, the first embodiment described above may be combined with the second related technique or the third related technique .

そして、ホイール11に対して圧入して組み付ける際に変形をより確実に防止するときには、例えば図10に示す第の実施の形態のように、凹部47は、底板部41の一方の側部41aのみに設け、成形型51,52のパーティング面51a,52aの位置を、底板部41においては凹部47と反対側である他方の側部41a側に、上板部42においては一方の側部41a側にそれぞれずらすようにしてもよい。この場合には、最も厚肉となるパーティング面51a,52a近傍の位置を、リム面26に当接する底板部41の他方の側部41a側とするとともに、圧入される一方の係止部43をパーティング面51a,52aに接近させて、他方の係止部43よりも厚肉に形成することができ、ホイール11に対して圧入して組み付けるための剛性を充分に確保できる。但し、成形時のバリが係止部43,43に形成されないようにするために、パーティング面51a,52aの位置は、凹部47を除く底板部41の範囲内、及び、上板部42の範囲内とする In order to more reliably prevent deformation when press-fitting into the wheel 11 and assembling, the concave portion 47 is formed on one side portion 41a of the bottom plate portion 41, for example, as in the second embodiment shown in FIG. The parting surfaces 51a and 52a of the molds 51 and 52 are provided only on the side 41a on the side opposite to the recess 47 in the bottom plate 41 and on one side in the upper plate 42. You may make it shift to 41a side, respectively. In this case, the position in the vicinity of the thickest parting surfaces 51a and 52a is the other side portion 41a side of the bottom plate portion 41 in contact with the rim surface 26, and one of the locking portions 43 to be press-fitted. Can be made closer to the parting surfaces 51a and 52a and thicker than the other locking portion 43, and sufficient rigidity can be secured for press-fitting into the wheel 11 for assembly. However, the parting surfaces 51a and 52a are positioned within the range of the bottom plate portion 41 excluding the concave portion 47 and the top plate portion 42 so that burrs at the time of molding are not formed in the locking portions 43 and 43. Within range .

本発明は、自動車などの車輪の空気室に配置されて共鳴による騒音を低減するレゾネータに適用できる。   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 ホイール
12 レゾネータ
25 空気室
26 リム面
33 保持部
36 レゾネータ本体
37 連通部
41 底板部
42 上板部
43 係止部
45 副気室
47 凹部
51,52 成形型
51a,52a パーティング面
55 溝部
11 wheel
12 Resonator
25 Air chamber
26 Rim surface
33 Holding part
36 Resonator body
37 Communication part
41 Bottom plate
42 Upper plate
43 Locking part
45 Secondary air chamber
47 recess
51, 52 Mold
51a, 52a Parting surface
55 Groove

Claims (4)

タイヤとこのタイヤが取り付けられたホイールとの間の空気室に配置されて騒音を低減するレゾネータであって、
前記ホイールの周方向に沿って長手方向を有し、内部に副気室を設けたレゾネータ本体と、
このレゾネータ本体に設けられ、前記副気室を前記空気室と連通させる連通部とを具備し、
前記レゾネータ本体は、
前記ホイールのリム面に対向する底板部と、
この底板部に対して前記リム面と反対側に離間された上板部と、
これら底板部と上板部とを両側部で連結してこれら底板部及び上板部とともに前記副気室を区画し、かつ、両側部に延出して前記リム面に対向する保持部に係止される係止部と、
前記底板部の少なくともいずれかの側部に設けられた凹部とを備え、
前記連通部は、前記レゾネータ本体の長手方向の少なくともいずれかの端部に、前記上板部に対して一部が略面一となるように前記長手方向に沿って設けられ、
前記凹部を除く前記底板部及び前記上板部の位置で前記レゾネータ本体の長手方向に沿ってパーティング面を有する成形型を用いてブロー成形されている
ことを特徴とするレゾネータ。
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, and having a sub air chamber therein,
Provided in the resonator main body, comprising a communication portion for communicating the auxiliary air chamber with the air chamber,
The resonator body is
A bottom plate portion facing the rim surface of the wheel;
An upper plate portion spaced apart from the rim surface with respect to the bottom plate portion;
The bottom plate portion and the upper plate portion are connected at both sides to partition the auxiliary air chamber together with the bottom plate portion and the upper plate portion, and are extended to both sides and locked to the holding portion facing the rim surface. A locking portion to be
A recess provided on at least one side of the bottom plate portion,
The communication part is provided along the longitudinal direction at least at one end in the longitudinal direction of the resonator body so that a part thereof is substantially flush with the upper plate part,
A resonator that is blow-molded using a molding die having a parting surface along the longitudinal direction of the resonator main body at the position of the bottom plate portion and the upper plate portion excluding the concave portion.
凹部は、レゾネータ本体の長手方向と交差する方向に沿って、この長手方向に間欠的に複数設けられた
ことを特徴とする請求項1記載のレゾネータ。
The resonator according to claim 1, wherein a plurality of recesses are provided intermittently in the longitudinal direction along a direction intersecting with the longitudinal direction of the resonator body.
係止部は、レゾネータ本体の長手方向に凹部とずれた位置にそれぞれ設けられた
ことを特徴とする請求項2記載のレゾネータ
The resonator according to claim 2, wherein the locking portion is provided at a position shifted from the concave portion in the longitudinal direction of the resonator main body .
上板部及びこの上板部に対して一部が略面一な連通部に亘って連続しレゾネータ本体の長手方向に沿って溝部が設けられた
ことを特徴とする請求項1ないし3いずれか一記載のレゾネータ。
The upper plate portion and a communication portion that is partially flush with the upper plate portion and continuing to the longitudinal direction of the resonator main body are provided along the longitudinal direction of the resonator body . The resonator according to one .
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