JP6144615B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP6144615B2
JP6144615B2 JP2013260084A JP2013260084A JP6144615B2 JP 6144615 B2 JP6144615 B2 JP 6144615B2 JP 2013260084 A JP2013260084 A JP 2013260084A JP 2013260084 A JP2013260084 A JP 2013260084A JP 6144615 B2 JP6144615 B2 JP 6144615B2
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absorbing material
sound absorbing
tire
sound
peripheral surface
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JP2015116865A (en
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一泰 榊原
一泰 榊原
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Description

本発明は、タイヤ幅方向に沿って延びる棒状の吸音材をタイヤ内周面に取り付けた空気入りタイヤに関するものである。   The present invention relates to a pneumatic tire in which a rod-like sound absorbing material extending along the tire width direction is attached to a tire inner peripheral surface.

従来より、空気入りタイヤの性能を向上させるために、空気入りタイヤの内面に種々の機能を有するデバイス、例えば吸音材等を取り付けることが提案されている。また、これらのデバイスを空気入りタイヤの内面に取り付けるに当たり、デバイスを容易に取り付けるための種々の工夫がなされている。   Conventionally, in order to improve the performance of a pneumatic tire, it has been proposed to attach devices having various functions, such as a sound absorbing material, to the inner surface of the pneumatic tire. In addition, various devices for easily attaching the devices have been made in attaching these devices to the inner surface of the pneumatic tire.

下記特許文献１には、モジュールを空気入りタイヤの内面に固定する装置が記載されている。この装置は、タイヤに固定された支持体と、モジュールを取り付けるための可撓性ストリップとで構成されている。また、下記特許文献２には、タイヤ内部に電子装置を取り付けるための取付パッチが記載されている。この取付パッチは、電子装置を支持するためのプラットホームと、取付パッチの基部とプラットホームとを結合するピラーとを有している。   Patent Document 1 below describes an apparatus for fixing a module to the inner surface of a pneumatic tire. This device consists of a support fixed to the tire and a flexible strip for mounting the module. Patent Document 2 below describes an attachment patch for attaching an electronic device inside a tire. The mounting patch includes a platform for supporting the electronic device, and a pillar that connects the base of the mounting patch and the platform.

ところで、種々のデバイスを取付具を介してタイヤ内面に取り付ける場合、取付具及び取り付けられるデバイスの重量によって、タイヤ走行時のユニフォミティに影響を与え、走行時の振動による乗り心地の悪化が懸念される。また、デバイス及び取付具の高さが高過ぎると、リム組み付け時にリムフランジ等と接触し、リム組性を損なう恐れがある。そのため、取付具によりデバイスをタイヤ内面に確実に固定しつつ、デバイスと取付具には軽量化及び小型化が要求される。   By the way, when attaching various devices to the tire inner surface via a fixture, the weight of the fixture and the attached device affects the uniformity when the tire is running, and there is a concern that the riding comfort may deteriorate due to vibration during running. . Moreover, when the height of the device and the fixture is too high, there is a possibility that the rim assembly property may be impaired due to contact with a rim flange or the like when the rim is assembled. Therefore, the device and the fixture are required to be reduced in weight and size while the device is securely fixed to the tire inner surface by the fixture.

特表２００９−５３２２６６号公報Special table 2009-532266 gazette 特開２００５−１７８７６１号公報JP-A-2005-177871

そこで、本発明の目的は、タイヤ内周面に吸音材を確実に取り付けるとともに、走行時の振動を低減し、かつリム組性の悪化を抑制できる空気入りタイヤを提供することにある。   Accordingly, an object of the present invention is to provide a pneumatic tire capable of securely attaching a sound absorbing material to the inner peripheral surface of a tire, reducing vibration during traveling, and suppressing deterioration of rim assembly.

上記目的は、下記の如き本発明により達成できる。
即ち、本発明の空気入りタイヤは、タイヤ幅方向に沿って延びる棒状の吸音材をタイヤ内周面に取り付けた空気入りタイヤであって、
前記タイヤ内周面に固定され、前記吸音材を取り付けるための筒状の吸音材取付具を備え、
前記吸音材取付具は、前記吸音材の長手方向中央部の周囲を圧縮状態で拘束しており、
前記吸音材取付具のタイヤ内周面からの最大高さがタイヤ断面高さの４３％以下であることを特徴とする。 The above object can be achieved by the present invention as described below.
That is, the pneumatic tire of the present invention is a pneumatic tire in which a rod-like sound absorbing material extending along the tire width direction is attached to the tire inner peripheral surface,
It is fixed to the tire inner peripheral surface, and includes a cylindrical sound absorbing material attachment for attaching the sound absorbing material,
The sound absorbing material fixture is constrained in a compressed state around the longitudinal center of the sound absorbing material,
The maximum height from the tire inner peripheral surface of the sound absorbing material fixture is 43% or less of the tire cross-section height.

本発明の空気入りタイヤは、タイヤ内周面にタイヤ幅方向に沿って延びる棒状の吸音材を取り付けたものである。このような吸音材をタイヤ内周面に取り付けることで、空洞共鳴音の低減を図ることができる。タイヤ内周面に固定される筒状の吸音材取付具は、吸音材の長手方向中央部の周囲を圧縮状態で拘束しているため、吸音材が吸音材取付具から抜けにくく、吸音材をタイヤ内周面に確実に取り付けることができる。また、吸音材取付具のタイヤ内周面からの最大高さをタイヤ断面高さの４３％以下とすることで、吸音材取付具の重量を抑えて走行時の振動を低減し、かつ吸音材取付具の高さを抑えてリム組性の悪化を抑制できる。   In the pneumatic tire of the present invention, a rod-like sound absorbing material extending along the tire width direction is attached to a tire inner peripheral surface. By attaching such a sound absorbing material to the inner circumferential surface of the tire, it is possible to reduce the cavity resonance noise. The cylindrical sound-absorbing material fixture fixed to the tire inner peripheral surface restrains the periphery of the central portion in the longitudinal direction of the sound-absorbing material in a compressed state. It can be securely attached to the tire inner peripheral surface. In addition, the maximum height from the tire inner peripheral surface of the sound absorbing material fixture is set to 43% or less of the tire cross-section height, thereby suppressing the weight of the sound absorbing material fixture and reducing vibration during traveling, and the sound absorbing material. Deterioration of the rim assembly can be suppressed by suppressing the height of the fixture.

本発明にかかる空気入りタイヤにおいて、前記吸音材取付具の前記最大高さが、前記吸音材のタイヤ内周面からの最大高さよりも低いことが好ましい。   In the pneumatic tire according to the present invention, it is preferable that the maximum height of the sound absorbing material fixture is lower than a maximum height of the sound absorbing material from the tire inner peripheral surface.

この構成によれば、吸音材の大きさを確保して空洞共鳴音を効果的に低減しつつ、走行時の振動を低減し、かつリム組性の悪化を抑制できる。   According to this configuration, it is possible to reduce vibration during traveling and suppress deterioration of rim assembly while ensuring the size of the sound absorbing material and effectively reducing cavity resonance noise.

本発明にかかる空気入りタイヤにおいて、前記吸音材のタイヤ内周面からの高さは、長手方向中央部から長手方向両端部に向かって徐々に高くなっていることが好ましい。   In the pneumatic tire according to the present invention, it is preferable that the height of the sound absorbing material from the tire inner peripheral surface gradually increases from the longitudinal central portion toward both longitudinal end portions.

この構成によれば、吸音材の大きさを確保して空洞共鳴音を効果的に低減しつつ、走行時の振動を低減し、かつリム組性の悪化を抑制できる。   According to this configuration, it is possible to reduce vibration during traveling and suppress deterioration of rim assembly while ensuring the size of the sound absorbing material and effectively reducing cavity resonance noise.

本発明にかかる空気入りタイヤにおいて、前記吸音材取付具のタイヤ内周面からの高さは、長手方向中央部から長手方向両端部に向かって徐々に高くなっていることが好ましい。   In the pneumatic tire according to the present invention, it is preferable that the height of the sound absorbing member mounting tool from the tire inner peripheral surface is gradually increased from the central portion in the longitudinal direction toward both end portions in the longitudinal direction.

この構成によれば、吸音材の長手方向中央部を効果的に圧縮して、棒状の吸音材をＶ字状に屈曲させることができる。これにより、吸音材の長手方向両端部における最大高さを高くして空洞共鳴音の低減効果を高めることができる。   According to this structure, the longitudinal direction center part of a sound-absorbing material can be compressed effectively, and a rod-shaped sound-absorbing material can be bent in V shape. Thereby, the maximum height in the longitudinal direction both ends of a sound-absorbing material can be made high, and the reduction effect of cavity resonance sound can be heightened.

本発明にかかる空気入りタイヤにおいて、前記吸音材取付具の外周面には、周方向に延びるリブが形成されていることが好ましい。   The pneumatic tire concerning this invention WHEREIN: It is preferable that the rib extended in the circumferential direction is formed in the outer peripheral surface of the said sound-absorbing material fixture.

この構成によれば、吸音材取付具のタイヤ内周面からの高さが、長手方向中央部よりも長手方向両端部で高くなりやすく、吸音材取付具により吸音材の長手方向中央部を効果的に圧縮して、棒状の吸音材をＶ字状に屈曲させることができる。これにより、吸音材の長手方向両端部における最大高さを高くして空洞共鳴音の低減効果を高めることができる。   According to this configuration, the height of the sound absorbing material fixture from the tire inner peripheral surface is likely to be higher at both ends in the longitudinal direction than the central portion in the longitudinal direction, and the sound absorbing material fixture is effective in the longitudinal central portion of the sound absorbing material. The rod-like sound absorbing material can be bent into a V shape. Thereby, the maximum height in the longitudinal direction both ends of a sound-absorbing material can be made high, and the reduction effect of cavity resonance sound can be heightened.

本発明の空気入りタイヤの一例を示すタイヤ子午線断面図Tire meridian cross-sectional view showing an example of the pneumatic tire of the present invention 吸音材取付具の詳細な構成を示す三面図Three views showing the detailed configuration of the sound absorbing material fixture 他の実施形態に係る空気入りタイヤのタイヤ子午線断面図Tire meridian cross-sectional view of a pneumatic tire according to another embodiment 他の実施形態に係る空気入りタイヤのタイヤ子午線断面図Tire meridian cross-sectional view of a pneumatic tire according to another embodiment

以下、本発明の実施の形態について、図面を参照しながら説明する。初めに、本発明の空気入りタイヤの構成を説明する。図１は、空気入りタイヤの一例を示すタイヤ子午線断面図である。ここで、Ｈはタイヤ断面高さを示している。なお、タイヤ断面高さＨは、タイヤ子午線断面において、ＪＡＴＭＡ規定の空気圧を充填した状態で、ノミナルリム径からトレッド表面までの高さである。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the configuration of the pneumatic tire of the present invention will be described. FIG. 1 is a tire meridian cross-sectional view showing an example of a pneumatic tire. Here, H indicates the tire cross-sectional height. The tire cross-section height H is a height from the nominal rim diameter to the tread surface in a state in which the air pressure defined by JATMA is filled in the tire meridian cross section.

空気入りタイヤ１は、タイヤ幅方向ＷＤに沿って延びる棒状の吸音材２がタイヤ内周面１ａに取り付けられている。吸音材２は、タイヤ内周面１ａに対してタイヤ周方向に間隔を空けて複数個設けられることが好ましい。例えば、４個の吸音材２をタイヤ周方向に等間隔で配置するのが好ましい。   In the pneumatic tire 1, a rod-like sound absorbing material 2 extending along the tire width direction WD is attached to the tire inner peripheral surface 1a. It is preferable that a plurality of the sound absorbing materials 2 are provided at intervals in the tire circumferential direction with respect to the tire inner circumferential surface 1a. For example, it is preferable to arrange four sound absorbing materials 2 at equal intervals in the tire circumferential direction.

吸音材２としては、特に限定されないが、軟質ポリウレタンフォームからなるスポンジが好ましく用いられる。ただし、吸音材２は、吸音効果があれば、軟質ポリウレタンフォームでなくともよく、グラスウール、不織布等の繊維体や穴あき板やスリット板等の共鳴吸音材料、フィルム等の膜状材料でもよい。吸音材２の形状としては、棒状であれば特に限定されないが、例えば円柱状、四角柱状、三角柱状等が挙げられる。このような形状のほか、吸音材２の形状は、中空の筒状が好ましい。吸音材２が筒状の場合、内部に空気層が形成されるため、吸音材２を通過する音を吸音する効果が高い。さらに、吸音材２の形状は円筒状が特に好ましい。吸音材２が円筒状の場合、あらゆる角度からの音に対して吸音効果を発揮できる。   The sound absorbing material 2 is not particularly limited, but a sponge made of a flexible polyurethane foam is preferably used. However, the sound absorbing material 2 may not be a flexible polyurethane foam as long as it has a sound absorbing effect, and may be a fiber body such as glass wool or nonwoven fabric, a resonance sound absorbing material such as a perforated plate or a slit plate, or a film-like material such as a film. The shape of the sound absorbing material 2 is not particularly limited as long as it is a rod shape, and examples thereof include a columnar shape, a quadrangular prism shape, and a triangular prism shape. In addition to such a shape, the sound absorbing material 2 is preferably a hollow cylinder. When the sound absorbing material 2 is cylindrical, an air layer is formed inside, so that the effect of absorbing sound passing through the sound absorbing material 2 is high. Furthermore, the shape of the sound absorbing material 2 is particularly preferably cylindrical. When the sound absorbing material 2 is cylindrical, a sound absorbing effect can be exhibited with respect to sound from all angles.

吸音材２は、吸音材取付具３を介してタイヤ内周面１ａに取り付けられる。吸音材取付具３は、タイヤ内周面１ａに固定される。吸音材取付具３は、筒状をしており、内部に吸音材２が挿入される。   The sound absorbing material 2 is attached to the tire inner peripheral surface 1 a via a sound absorbing material attachment 3. The sound absorbing material fixture 3 is fixed to the tire inner peripheral surface 1a. The sound absorbing material fixture 3 has a cylindrical shape, and the sound absorbing material 2 is inserted therein.

図２は、吸音材取付具３の詳細な構成を示す三面図である。吸音材取付具３は、タイヤ内周面１ａに固定するための取付ベース部３１を備えている。   FIG. 2 is a three-sided view showing the detailed configuration of the sound absorbing material fixture 3. The sound absorbing material fixture 3 includes an attachment base portion 31 for fixing to the tire inner peripheral surface 1a.

本実施形態の吸音材取付具３は、略円筒状をしており、その外周面には、周方向に延びるリブ３０が形成されている。リブ３０は、取付ベース部３１に達している。リブ３０は、吸音材取付具３の軸方向の中央部に形成される。本実施形態では、４本のリブ３０が等間隔で形成されている。このリブ３０により吸音材取付具３の軸方向の中央部が補強され、吸音材２に対する拘束力が向上する。   The sound absorbing material fixture 3 of the present embodiment has a substantially cylindrical shape, and a rib 30 extending in the circumferential direction is formed on the outer peripheral surface thereof. The rib 30 reaches the mounting base portion 31. The rib 30 is formed at the central portion in the axial direction of the sound absorbing material fixture 3. In the present embodiment, four ribs 30 are formed at equal intervals. The rib 30 reinforces the central portion in the axial direction of the sound-absorbing material fixture 3 and improves the binding force on the sound-absorbing material 2.

取付ベース部３１は、略円形の板状であって、吸音材取付具３と一体となっている。取付ベース部３１の形状は特に限定されないが、軽量化と確実な固定のため、楕円形が好ましい。取付ベース部３１を楕円形の板状とする場合、取付ベース部３１は、楕円の長径方向がタイヤ周方向、短径方向がタイヤ幅方向ＷＤとなるようにタイヤ内周面１ａに固定される。   The attachment base portion 31 has a substantially circular plate shape and is integrated with the sound absorbing material attachment 3. The shape of the mounting base portion 31 is not particularly limited, but an elliptical shape is preferable for weight reduction and secure fixing. When the mounting base portion 31 has an elliptical plate shape, the mounting base portion 31 is fixed to the tire inner peripheral surface 1a so that the major axis direction of the ellipse is the tire circumferential direction and the minor axis direction is the tire width direction WD. .

取付ベース３１の表面には、放射状に複数本のリブ３２が形成されている。リブ３２を設けることで、軽量化しつつ、取付ベース３１の強度を高めて耐久性を向上できる。   A plurality of radial ribs 32 are formed on the surface of the mounting base 31. Providing the ribs 32 can increase the strength of the mounting base 31 and improve the durability while reducing the weight.

吸音材取付具３と取付ベース部３１は、例えば、熱可塑性樹脂で一体成形されるのが好ましい。熱可塑性樹脂で一体成形する際、吸音材取付具３と取付ベース部３１にそれぞれリブ３０とリブ３２を形成しているため、樹脂流れも良好となる。熱可塑性樹脂としては、ＴＰＵ（熱可塑性ポリウレタン：Thermoplastic Polyurethane）が例示される。   It is preferable that the sound-absorbing material fixture 3 and the mounting base portion 31 are integrally formed of, for example, a thermoplastic resin. When integrally molding with a thermoplastic resin, the rib 30 and the rib 32 are formed on the sound absorbing material mounting member 3 and the mounting base portion 31 respectively, so that the resin flow is also good. Examples of the thermoplastic resin include TPU (Thermoplastic Polyurethane).

取付ベース部３１は、クッション層４を介してタイヤ内周面１ａに接着されることが好ましい。クッション層４は、伸縮性を有するクッション層本体４１と、クッション層本体４１の両側の接着剤層４２，４３とで構成されている。これにより、クッション層４中のクッション層本体４１がタイヤ内周面１ａの凹凸又は曲面の形状に追従して変形して接着されるので、取付ベース部３１をタイヤ内周面１ａに安定して固定することができる。   The mounting base portion 31 is preferably bonded to the tire inner peripheral surface 1 a via the cushion layer 4. The cushion layer 4 includes a cushion layer body 41 having elasticity and adhesive layers 42 and 43 on both sides of the cushion layer body 41. As a result, the cushion layer body 41 in the cushion layer 4 is deformed and bonded following the unevenness or curved surface shape of the tire inner peripheral surface 1a, so that the mounting base portion 31 is stably attached to the tire inner peripheral surface 1a. Can be fixed.

吸音材取付具３は、吸音材２の長手方向中央部２ａの周囲を圧縮状態で拘束している。圧縮状態とは、吸音材２が外力によりわずかでも潰れた状態のことをいい、吸音材２の外表面と吸音材取付具３の外周面が面一の場合であっても、少なくとも吸音材取付具３の厚みの分だけ吸音材２は圧縮されている。このように、吸音材２の長手方向中央部２ａの周囲を圧縮状態で拘束しているため、吸音材２が吸音材取付具３から抜けにくくなり、吸音材２をタイヤ内周面１ａに確実に取り付けることができる。   The sound absorbing material fixture 3 restrains the periphery of the longitudinal central portion 2a of the sound absorbing material 2 in a compressed state. The compressed state refers to a state in which the sound absorbing material 2 is slightly crushed by an external force. Even when the outer surface of the sound absorbing material 2 and the outer peripheral surface of the sound absorbing material fitting 3 are flush with each other, at least the sound absorbing material is attached. The sound absorbing material 2 is compressed by the thickness of the tool 3. Thus, since the periphery of the longitudinal center part 2a of the sound absorbing material 2 is constrained in a compressed state, the sound absorbing material 2 is difficult to come off from the sound absorbing material mounting tool 3, and the sound absorbing material 2 is securely attached to the tire inner peripheral surface 1a. Can be attached to.

図１に示す吸音材２をタイヤ内周面１ａに取り付けた状態で、吸音材取付具３のタイヤ内周面１ａからの最大高さＨ３は、タイヤ断面高さＨの４３％以下である。好ましくは、吸音材取付具３の最大高さＨ３は、タイヤ断面高さＨの１７％以下である。本実施形態では、吸音材取付具３の軸方向の両端が最大高さとなっている。また、タイヤサイズが２３５／５０Ｒ１８の場合、吸音材取付具３の最大高さＨ３は、５０ｍｍ以下であり、好ましくは２０ｍｍ以下である。なお、最大高さＨ３は、タイヤ赤道の位置でのタイヤ内周面１ａを基準としたタイヤ径方向内側への最大高さとする。   In the state where the sound absorbing material 2 shown in FIG. 1 is attached to the tire inner peripheral surface 1a, the maximum height H3 from the tire inner peripheral surface 1a of the sound absorbing material fitting 3 is 43% or less of the tire cross-sectional height H. Preferably, the maximum height H3 of the sound absorbing material fixture 3 is not more than 17% of the tire cross-section height H. In the present embodiment, both ends in the axial direction of the sound absorbing material fixture 3 have a maximum height. Moreover, when the tire size is 235 / 50R18, the maximum height H3 of the sound absorbing material fixture 3 is 50 mm or less, preferably 20 mm or less. The maximum height H3 is the maximum height inward in the tire radial direction with reference to the tire inner peripheral surface 1a at the position of the tire equator.

吸音材取付具３の最大高さＨ３をタイヤ断面高さＨの４３％以下とすることで、リム組み付け時に吸音材取付具３がリムフランジ等と接触することを防ぎ、リム組性の悪化を抑制できる。なお、吸音材２は、吸音材取付具３に比べて柔らかいため、リムフランジ等に接触した際の悪影響は少ない。   By setting the maximum height H3 of the sound absorbing material fitting 3 to 43% or less of the tire cross-section height H, the sound absorbing material fitting 3 is prevented from coming into contact with the rim flange or the like during rim assembly, and the rim assembling property is deteriorated. Can be suppressed. In addition, since the sound absorbing material 2 is softer than the sound absorbing material fitting 3, there is little adverse effect when contacting the rim flange or the like.

また、吸音材２と吸音材取付具３の重量によって、タイヤ走行時のユニフォミティに影響を与え、走行時の振動による乗り心地の悪化が懸念される。吸音材取付具３の最大高さＨ３をタイヤ断面高さＨの４３％以下とすることで、吸音材取付具３の重量を抑えることができる。吸音材２に比べて密度の高い吸音材取付具３の重量を抑えることで、効果的に全体の重量を抑えて走行時の振動を低減できる。   In addition, the weight of the sound absorbing material 2 and the sound absorbing material attachment 3 affects the uniformity during tire traveling, and there is a concern that the riding comfort may be deteriorated due to vibration during traveling. By setting the maximum height H3 of the sound absorbing material fixture 3 to 43% or less of the tire cross-section height H, the weight of the sound absorbing material fixture 3 can be suppressed. By suppressing the weight of the sound-absorbing material fixture 3 having a higher density than that of the sound-absorbing material 2, the overall weight can be effectively suppressed and vibration during traveling can be reduced.

吸音材２のタイヤ内周面１ａからの最大高さＨ２は、タイヤ断面高さＨの３０％以上であることが好ましく、５０％以下であることが好ましい。吸音材２の最大高さＨ２をタイヤ断面高さＨの３０％よりも低くすると、吸音材２による空洞共鳴音の低減効果が小さくなる。一方、吸音材２の最大高さＨ２をタイヤ断面高さＨの５０％よりも高くすると、吸音材２の重量が大きくなり、走行時の振動が増大する。なお、最大高さＨ２は、タイヤ赤道の位置でのタイヤ内周面１ａを基準としたタイヤ径方向内側への最大高さとする。   The maximum height H2 from the tire inner peripheral surface 1a of the sound absorbing material 2 is preferably 30% or more of the tire cross-section height H, and preferably 50% or less. When the maximum height H2 of the sound absorbing material 2 is made lower than 30% of the tire cross-section height H, the effect of reducing the cavity resonance sound by the sound absorbing material 2 becomes small. On the other hand, if the maximum height H2 of the sound absorbing material 2 is set higher than 50% of the tire cross-sectional height H, the weight of the sound absorbing material 2 increases and vibration during running increases. The maximum height H2 is the maximum height inward in the tire radial direction with reference to the tire inner peripheral surface 1a at the position of the tire equator.

吸音材取付具３の最大高さＨ３が、吸音材２のタイヤ内周面１ａからの最大高さＨ２よりも低いことが好ましい。この構成によれば、吸音材２の大きさを確保して空洞共鳴音を効果的に低減しつつ、吸音材取付具３の重量と高さを抑えて、走行時の振動を低減し、かつリム組性の悪化を抑制できる。   The maximum height H3 of the sound absorbing material fixture 3 is preferably lower than the maximum height H2 of the sound absorbing material 2 from the tire inner peripheral surface 1a. According to this configuration, while ensuring the size of the sound absorbing material 2 and effectively reducing the cavity resonance noise, the weight and height of the sound absorbing material fixture 3 are suppressed, and vibration during running is reduced, and Deterioration of rim assembly can be suppressed.

吸音材２のタイヤ内周面１ａからの高さは、長手方向中央部２ａから長手方向両端部２ｂに向かって徐々に高くなっていることが好ましい。空洞共鳴音を低減するためには、吸音材２の高さは、出来る限り高くするのが好ましい。吸音材２の長手方向両端部２ｂを高くしても、リムフランジ等への接触による悪影響は少ないため、吸音材２の高さを、長手方向中央部２ａから長手方向両端部２ｂに向かって徐々に高くすることで、吸音材２の大きさを確保して空洞共鳴音を効果的に低減できる。   It is preferable that the height of the sound absorbing material 2 from the tire inner peripheral surface 1a is gradually increased from the longitudinal central portion 2a toward both longitudinal end portions 2b. In order to reduce the cavity resonance noise, the height of the sound absorbing material 2 is preferably as high as possible. Even if the longitudinal end portions 2b of the sound absorbing material 2 are raised, there is little adverse effect due to contact with the rim flange or the like, so the height of the sound absorbing material 2 is gradually increased from the longitudinal center portion 2a toward the longitudinal end portions 2b. By making it high, the size of the sound absorbing material 2 can be secured and the cavity resonance can be effectively reduced.

吸音材取付具３のタイヤ内周面１ａからの高さは、長手方向中央部３ａから長手方向両端部３ｂに向かって徐々に高くなっていることが好ましい。この構成によれば、吸音材２の長手方向中央部２ａを効果的に圧縮して、棒状の吸音材２の軸を図１に示すような略Ｖ字状に屈曲させることができる。これにより、吸音材２の最大高さＨ２を高くして空洞共鳴音の低減効果を高めることができる。また、吸音材取付具３の高さを長手方向中央部３ａから長手方向両端部３ｂに向かって徐々に高くすることで、吸音材取付具３の長手方向両端部３ｂにおける吸音材２の応力集中が緩和され、吸音材２が壊れにくくなる。   It is preferable that the height of the sound absorbing material fixture 3 from the tire inner peripheral surface 1a gradually increases from the longitudinal central portion 3a toward the longitudinal end portions 3b. According to this configuration, the longitudinal center portion 2a of the sound absorbing material 2 can be effectively compressed, and the shaft of the rod-shaped sound absorbing material 2 can be bent into a substantially V shape as shown in FIG. Thereby, the maximum height H2 of the sound-absorbing material 2 can be increased, and the effect of reducing the cavity resonance sound can be enhanced. Moreover, the stress concentration of the sound absorbing material 2 at the longitudinal end portions 3b of the sound absorbing material fixture 3 is increased by gradually increasing the height of the sound absorbing material fixture 3 from the longitudinal center portion 3a toward the longitudinal end portions 3b. Is relaxed, and the sound-absorbing material 2 is hardly broken.

吸音材２と吸音材取付具３を合わせた総重量は、３０ｇ以下が好ましく、１５ｇ以下がより好ましい。吸音材２と吸音材取付具３の総重量が３０ｇを超えると、高速ユニフォミティの悪化やそれに伴う振動、乗り心地が悪化する傾向にある。   The total weight of the sound absorbing material 2 and the sound absorbing material fixture 3 is preferably 30 g or less, and more preferably 15 g or less. If the total weight of the sound-absorbing material 2 and the sound-absorbing material mounting tool 3 exceeds 30 g, the high-speed uniformity is deteriorated, the vibration associated therewith, and the riding comfort tend to deteriorate.

［他の実施形態］
（１）前述の実施形態では、棒状の吸音材２の軸が略Ｖ字状に屈曲した例を示したが、図３Ａに示すように、棒状の吸音材２の軸はタイヤ幅方向ＷＤに直線状であってもよい。 [Other Embodiments]
(1) In the above-described embodiment, an example in which the shaft of the rod-shaped sound absorbing material 2 is bent in a substantially V shape has been shown. However, as illustrated in FIG. 3A, the shaft of the rod-shaped sound absorbing material 2 is in the tire width direction WD. It may be linear.

（２）また、前述の実施形態では、吸音材取付具３の最大高さＨ３を、吸音材２の最大高さＨ２よりも低くしているが、図３Ｂに示すように、吸音材取付具３の最大高さＨ３と吸音材２の最大高さＨ２を等しくしてもよい。   (2) In the above-described embodiment, the maximum height H3 of the sound absorbing material fixture 3 is set lower than the maximum height H2 of the sound absorbing material 2. However, as shown in FIG. The maximum height H3 of 3 and the maximum height H2 of the sound absorbing material 2 may be made equal.

以下、本発明の構成と効果を具体的に示す実施例等について説明する。なお、実施例等における評価項目は下記のようにして測定を行った。   Examples and the like specifically showing the configuration and effects of the present invention will be described below. In addition, the evaluation item in an Example etc. measured as follows.

（１）振動
吸音材をタイヤ内周面に取り付けた空気入りタイヤについて、実車走行にて官能評価及び振動計測を行った。評価は、「◎」、「○」、「×」の三段階とし、「○」は走行時の振動が小さく、乗り心地が良好であることを示し、「◎」は特に良好であることを示し、「×」は走行時の振動が大きく、乗り心地が悪いことを示す。 (1) Vibration The sensory evaluation and vibration measurement were performed in the actual vehicle running on the pneumatic tire in which the sound absorbing material was attached to the inner peripheral surface of the tire. The evaluation is made in three stages, “◎”, “○”, “×”, “○” indicates that the vibration during driving is small and the ride comfort is good, and “◎” indicates that it is particularly good. “×” indicates that the vibration during running is large and the ride quality is poor.

（２）リム組性
吸音材をタイヤ内周面に取り付けた空気入りタイヤについて、実際にリム組を実施する際、リムフランジ等への接触による吸音材と吸音材取付具の破壊の有無を調べた。評価は、「◎」、「○」、「×」の三段階とし、「○」は吸音材又は吸音材取付具がリムフランジ等へ接触せずリム組性が良好であることを示し、「◎」は特に良好であることを示し、「×」は吸音材及び吸音材取付具がリムフランジ等へ接触し、破壊に至ったことを示す。 (2) Rim assembly characteristics When a rim assembly is actually performed on a pneumatic tire with a sound absorbing material attached to the inner peripheral surface of the tire, the presence or absence of destruction of the sound absorbing material and the sound absorbing material fitting due to contact with the rim flange, etc. is examined. It was. The evaluation is made in three stages, “◎”, “○”, “×”, and “○” indicates that the sound absorbing material or the sound absorbing material fixture does not contact the rim flange or the like, and the rim assemblability is good. “” Indicates particularly good, and “×” indicates that the sound-absorbing material and the sound-absorbing-material fitting contacted the rim flange or the like, resulting in destruction.

（３）低減効果
吸音材をタイヤ内周面に取り付けた空気入りタイヤについて、実車走行における官能評価およびノイズ計測により、空洞共鳴音の低減効果を調べた。評価は、「◎」、「○」、「△」の三段階とし、「○」は低減効果があったことを示し、「◎」は低減効果が特に大きかったことを示し、「△」は低減効果がわずかしかなかったことを示す。 (3) Reduction effect About the pneumatic tire which attached the sound-absorbing material to the tire inner peripheral surface, the reduction effect of the cavity resonance sound was investigated by sensory evaluation and noise measurement in actual vehicle running. The evaluation is made in three stages, “◎”, “○”, “△”, “○” indicates that there was a reduction effect, “◎” indicates that the reduction effect was particularly great, and “△” It shows that there was little reduction effect.

表１に示す寸法及び形状にて空気入りタイヤを製造して、上記性能を評価した。なお、何れの空気入りタイヤのサイズも２３５／５０Ｒ１８とした。表１の総重量（ｇ）とは吸音材と吸音材取付具を合わせた重量を示す。吸音材取付具の絞りの有無とは、図１のように、吸音材取付具のタイヤ内周面からの高さが長手方向中央部から長手方向両端部に向かって徐々に高くなっており、中央部が凹んだものを絞りが「あり」と示す。図３Ａや図３Ｂのように、吸音材取付具のタイヤ内周面からの高さが長手方向に一定のものを絞りが「なし」と示す。振動、リム組性、低減効果の評価結果を表１に併せて示す。   Pneumatic tires were manufactured with the dimensions and shapes shown in Table 1, and the above performance was evaluated. The size of each pneumatic tire was 235 / 50R18. The total weight (g) in Table 1 represents the combined weight of the sound absorbing material and the sound absorbing material fixture. The presence or absence of the diaphragm of the sound-absorbing material attachment means that the height from the tire inner peripheral surface of the sound-absorbing material attachment is gradually increased from the longitudinal center to both longitudinal ends as shown in FIG. If the central part is recessed, the aperture is indicated as “present”. As shown in FIG. 3A and FIG. 3B, a diaphragm having a constant height in the longitudinal direction from the tire inner peripheral surface of the sound absorbing material fixture is indicated as “none”. The evaluation results of vibration, rim assembly, and reduction effect are also shown in Table 1.

Figure 0006144615
Figure 0006144615

表１の結果から以下のことが分かる。実施例１〜４の空気入りタイヤは、比較例１と比べて、振動が小さく、乗り心地が良好であり、かつリム組性も良好であった。ただし、実施例１は、振動が小さく、かつリム組性も良好であるが、吸音材が小さいため、空洞共鳴音の低減効果がわずかしか得られなかった。   From the results in Table 1, the following can be understood. In comparison with Comparative Example 1, the pneumatic tires of Examples 1 to 4 had less vibration, good riding comfort, and good rim assembly. However, in Example 1, the vibration was small and the rim assemblability was good, but since the sound-absorbing material was small, the effect of reducing the cavity resonance sound was only slightly obtained.

１ 空気入りタイヤ
１ａ タイヤ内周面
２ 吸音材
２ａ 吸音材の長手方向中央部
３ 吸音材取付具
３０ リブ
Ｈ タイヤ断面高さ
Ｈ２ 吸音材のタイヤ内周面からの最大高さ
Ｈ３ 吸音材取付具のタイヤ内周面からの最大高さ
ＷＤ タイヤ幅方向 DESCRIPTION OF SYMBOLS 1 Pneumatic tire 1a Tire inner peripheral surface 2 Sound-absorbing material 2a Longitudinal center part of sound-absorbing material 3 Sound-absorbing material attachment 30 Rib H Tire cross-section height H2 Maximum height of sound-absorbing material from tire inner peripheral surface H3 Sound-absorbing material attachment Maximum height from the tire inner circumferential surface WD Tire width direction

Claims (5)

タイヤ幅方向に沿って延びる棒状の吸音材をタイヤ内周面に取り付けた空気入りタイヤであって、
前記タイヤ内周面に固定され、前記吸音材を取り付けるための筒状の吸音材取付具を備え、
前記吸音材取付具は、前記吸音材の長手方向中央部の周囲を圧縮状態で拘束しており、
前記吸音材取付具のタイヤ内周面からの最大高さがタイヤ断面高さの４３％以下であることを特徴とする空気入りタイヤ。 A pneumatic tire in which a rod-shaped sound absorbing material extending along the tire width direction is attached to the tire inner peripheral surface,
It is fixed to the tire inner peripheral surface, and includes a cylindrical sound absorbing material attachment for attaching the sound absorbing material,
The sound absorbing material fixture is constrained in a compressed state around the longitudinal center of the sound absorbing material,
The pneumatic tire according to claim 1, wherein a maximum height of the sound-absorbing material mounting tool from a tire inner peripheral surface is 43% or less of a tire cross-sectional height. 前記吸音材取付具の前記最大高さが、前記吸音材のタイヤ内周面からの最大高さよりも低いことを特徴とする請求項１に記載の空気入りタイヤ。   2. The pneumatic tire according to claim 1, wherein the maximum height of the sound absorbing material mounting tool is lower than a maximum height of the sound absorbing material from an inner circumferential surface of the tire. 前記吸音材のタイヤ内周面からの高さは、長手方向中央部から長手方向両端部に向かって徐々に高くなっていることを特徴とする請求項１又は２に記載の空気入りタイヤ。   3. The pneumatic tire according to claim 1, wherein a height of the sound absorbing material from the tire inner peripheral surface is gradually increased from a longitudinal central portion toward both longitudinal end portions. 前記吸音材取付具のタイヤ内周面からの高さは、長手方向中央部から長手方向両端部に向かって徐々に高くなっていることを特徴とする請求項１〜３のいずれか１項に記載の空気入りタイヤ。   The height from the tire inner peripheral surface of the sound-absorbing material mounting tool is gradually increased from the central portion in the longitudinal direction toward both ends in the longitudinal direction. The described pneumatic tire. 前記吸音材取付具の外周面には、周方向に延びるリブが形成されていることを特徴とする請求項１〜４のいずれか１項に記載の空気入りタイヤ。   The pneumatic tire according to any one of claims 1 to 4, wherein a rib extending in a circumferential direction is formed on an outer peripheral surface of the sound absorbing material fixture.
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