JP2005238888A - Tire sound absorbing material - Google Patents

Tire sound absorbing material Download PDF

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Publication number
JP2005238888A
JP2005238888A JP2004048481A JP2004048481A JP2005238888A JP 2005238888 A JP2005238888 A JP 2005238888A JP 2004048481 A JP2004048481 A JP 2004048481A JP 2004048481 A JP2004048481 A JP 2004048481A JP 2005238888 A JP2005238888 A JP 2005238888A
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Japan
Prior art keywords
absorbing material
sound
tire
sound absorbing
rim
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JP2004048481A
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Japanese (ja)
Inventor
Shinji Miyagawa
伸二 宮川
Tomoyuki Ishikawa
朝幸 石川
Fumiaki Shiba
文明 柴
Toshiyuki Kanehara
俊之 金原
Kenji Kato
賢二 加藤
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Sumitomo Rubber Industries Ltd
Sumitomo Riko Co Ltd
Central Motor Wheel Co Ltd
Toyota Motor Corp
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Sumitomo Rubber Industries Ltd
Sumitomo Riko Co Ltd
Central Motor Wheel Co Ltd
Toyota Motor Corp
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Application filed by Sumitomo Rubber Industries Ltd, Sumitomo Riko Co Ltd, Central Motor Wheel Co Ltd, Toyota Motor Corp filed Critical Sumitomo Rubber Industries Ltd
Priority to JP2004048481A priority Critical patent/JP2005238888A/en
Publication of JP2005238888A publication Critical patent/JP2005238888A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a tire sound absorbing material arranged on the periphery of a rim from being hurt and damaged when attaching/detaching a tire. <P>SOLUTION: A sliding layer 31 made of urethane film is laminated on a surface of a sound absorbing material body 30. Even though a bead is scraped at the time of attaching/detaching the tire, sliding of the bead on the surface of the sliding layer 31 can prevent the sound absorbing material 3 from being hurt/damaged. The sliding layer 31 also improves a sound absorption characteristic. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、自動車などのリムの外周表面に配設され、タイヤに防音機能を付与するタイヤ吸音材に関する。本発明のタイヤ吸音材は、自動車、産業車両、航空機などのタイヤに利用することができる。   The present invention relates to a tire sound absorbing material that is disposed on an outer peripheral surface of a rim of an automobile or the like and imparts a soundproofing function to a tire. The tire sound-absorbing material of the present invention can be used for tires of automobiles, industrial vehicles, airplanes and the like.

主として路面の凹凸に起因する騒音を低減するために、自動車のタイヤに防音部材を設けることが行われている。例えば特開昭62−216803号公報には、加圧空気が充填される充填空洞のインフレート下における全内容積の25％以上、70％未満に相当する見掛け体積のドーナツ状をなし、見掛け密度が 0.1ｇ／cm3 以下の多孔質物質を配置することが記載されている。このような多孔質体よりなる吸音部材を配置することで、空洞内での共鳴音を低減することができ、ロードノイズを低減することができる。 In order to reduce noise mainly caused by road surface unevenness, a soundproof member is provided in an automobile tire. For example, Japanese Patent Application Laid-Open No. 62-216803 discloses an apparent volume of donuts having an apparent volume corresponding to 25% or more and less than 70% of the total internal volume under inflation of a filled cavity filled with pressurized air. Describes that a porous material having a particle size of 0.1 g / cm 3 or less is disposed. By arranging such a sound absorbing member made of a porous body, resonance sound in the cavity can be reduced, and road noise can be reduced.

また特開平07−052616号公報には、タイヤの内周面とリムの外周面とで囲まれた空洞内に、多孔質の吸音部材を移動可能に配設することが記載されている。しかし移動可能に配設したのでは、走行時に吸音部材がタイヤあるいはリムに衝突を繰り返すため、吸音部材の摩耗変形により防音効果が早期に消失してしまう。したがって多孔質の吸音部材は、タイヤ又はリムに固着することが望ましく、吸音部材の装着が容易なホイールリムの外周に配設することが好ましい。   Japanese Patent Application Laid-Open No. 07-052616 describes that a porous sound absorbing member is movably disposed in a cavity surrounded by an inner peripheral surface of a tire and an outer peripheral surface of a rim. However, if the sound absorbing member is disposed so as to be movable, the sound absorbing member repeatedly collides with the tire or the rim during traveling, so that the soundproofing effect is quickly lost due to wear deformation of the sound absorbing member. Therefore, the porous sound absorbing member is desirably fixed to the tire or the rim, and is preferably disposed on the outer periphery of the wheel rim where the sound absorbing member can be easily attached.

しかしながらリムの外周に吸音部材をリング状に配設した場合には、タイヤのリムへの着脱時にタイヤのビード部が吸音部材と擦れるために、吸音部材に傷付きや破れが生じる場合がある。このように吸音部材が破損すると、本来の吸音効果が発現されない。   However, when the sound absorbing member is disposed in a ring shape on the outer periphery of the rim, the tire bead portion rubs against the sound absorbing member when the tire is attached to or detached from the rim, and the sound absorbing member may be damaged or torn. When the sound absorbing member is damaged in this way, the original sound absorbing effect is not exhibited.

そこで特開2002−307905号公報には、リムの外周表面にスポンジ材を用いた帯状シートからなる制音具をリング状に配設したタイヤとリムの組立体が記載されている。この公報によれば、制音具はリムのウエル部に形成された収容溝内に配設されているので、リムから突出する部分が僅かとなりタイヤの着脱時にビード部と擦れるのが抑制され、制音具の傷付き及び破損を抑制することができる。   Japanese Patent Application Laid-Open No. 2002-307905 describes a tire and rim assembly in which a sound control device made of a band-like sheet using a sponge material is arranged in a ring shape on the outer peripheral surface of the rim. According to this gazette, since the noise damper is disposed in the housing groove formed in the well portion of the rim, the portion protruding from the rim is small and it is suppressed from rubbing against the bead portion when the tire is attached and detached. Scratches and breakage of the noise control tool can be suppressed.

しかしながらタイヤの着脱時には、タイヤの中心軸とリムの中心軸とが交差する位置関係となるために、制音具が収容溝内に収納されていたとしても、ビード部が制音具の表面と擦れるのを完全に防止することは困難であり、制音具の表面に傷付きや破損が生じるのを防止することは困難であった。
特開昭62−216803号 特開平07−052616号 特開2002−307905号 However, when attaching and detaching the tire, the positional relationship in which the central axis of the tire and the central axis of the rim cross each other. Therefore, even if the noise control device is stored in the storage groove, It was difficult to completely prevent rubbing, and it was difficult to prevent the surface of the sound control tool from being damaged or damaged.
JP-A 62-216803 JP 07-052616 JP 2002-307905 A

本発明はこのような事情に鑑みてなされたものであり、リムの外周に配設されるタイヤ吸音材において、タイヤの着脱時の傷付き及び破損を防止することを解決すべき課題とする。   This invention is made | formed in view of such a situation, and makes it the problem which should be solved in the tire sound-absorbing material arrange | positioned on the outer periphery of a rim | limb to prevent the damage and damage at the time of tire attachment or detachment.

上記課題を解決する本発明のタイヤ吸音材の特徴は、断面略Ｕ字形状のタイヤの内周面とリムの外周面とで形成されるリング状空間内でリムの外周表面にリング状に配設されるタイヤ吸音材であって、その外周表面には滑り層をもつことにある。   The tire sound-absorbing material of the present invention that solves the above problems is characterized by being arranged in a ring shape on the outer peripheral surface of the rim in a ring-shaped space formed by the inner peripheral surface of the tire having a substantially U-shaped cross section and the outer peripheral surface of the rim. The tire sound absorbing material is provided with a slip layer on the outer peripheral surface thereof.

滑り層は、樹脂フィルムであることが好ましい。また滑り層は、表面に微細な凹凸を有することが好ましい。さらに吸音材本体は発泡ウレタンからなり、滑り層はウレタンフィルムであることが望ましい。   The sliding layer is preferably a resin film. The sliding layer preferably has fine irregularities on the surface. Furthermore, it is desirable that the sound-absorbing material main body is made of urethane foam and the sliding layer is a urethane film.

本発明のタイヤ吸音材によれば、タイヤの着脱時に傷付き及び破損を防止できるとともに、防音特性も向上する。   According to the tire sound-absorbing material of the present invention, it is possible to prevent damage and breakage when attaching and detaching the tire, and to improve soundproofing characteristics.

本発明のタイヤ吸音材は、外周表面に滑り層を備えている。したがってタイヤの着脱時にビードが擦れたとしても、ビードが吸音材表面を滑ることで吸音材に傷付きや破損が生じるのを防止することができる。   The tire sound-absorbing material of the present invention includes a sliding layer on the outer peripheral surface. Therefore, even if the bead is rubbed when the tire is attached or detached, it is possible to prevent the sound absorbing material from being damaged or damaged due to the bead sliding on the surface of the sound absorbing material.

本発明のタイヤ吸音材の本体は、吸音特性が必要であることから、弾性を有する多孔質体から形成される。例えば発泡ウレタン樹脂、発泡シリコーン樹脂などから形成することができ、軽量であること、コスト、吸音特性などの面から発泡ウレタン樹脂が特に好ましい。吸音材本体を発泡ウレタン樹脂から形成する場合には、その連泡率を80〜95％とすることが好ましい。連泡率が80％未満では吸音特性の発現が困難となる。また連泡率が95％を超えると、吸音効果が高い周波数域が高周波数側へ移行し、目的とする低周波数域の騒音を低減することが困難となる。   The main body of the tire sound-absorbing material of the present invention is formed of a porous body having elasticity because it requires sound-absorbing characteristics. For example, the foamed urethane resin can be formed from a foamed urethane resin, a foamed silicone resin, and the like, and the foamed urethane resin is particularly preferable in terms of light weight, cost, sound absorption characteristics, and the like. When the sound-absorbing material body is formed from a foamed urethane resin, the open cell rate is preferably 80 to 95%. If the open cell rate is less than 80%, it is difficult to develop sound absorption characteristics. On the other hand, when the open bubble ratio exceeds 95%, the frequency range having a high sound absorption effect shifts to the high frequency side, and it becomes difficult to reduce the target noise in the low frequency range.

吸音材は、リムの外周表面に沿うリング状とすることが望ましい。もし一部に吸音材が存在しない部位があると、その部分でロードノイズを低減することが困難となるからであり、またアンバランスを招き操縦安定性が低下する。また従来と同様に、リムのウエル部に形成された収容溝内に配設し、リムからの突出高さをできるだけ小さくすることが望ましい。また吸音材の固定方法としては、接合による方法、機械的に固定する方法などを用いることができるが、部品点数の増加を防止するためには接着剤あるいは粘着剤などによってリム表面と接合することが望ましい。   The sound absorbing material is preferably in a ring shape along the outer peripheral surface of the rim. If there is a part where no sound absorbing material is present in part, it is difficult to reduce road noise in that part, and unbalance is caused and steering stability is lowered. As in the prior art, it is desirable that the projection height from the rim be as small as possible by being disposed in a receiving groove formed in the well portion of the rim. In addition, as a method for fixing the sound absorbing material, a bonding method, a mechanical fixing method, or the like can be used. However, in order to prevent an increase in the number of parts, bonding to the rim surface with an adhesive or an adhesive is possible. Is desirable.

また吸音材の断面形状は特に制限されないが、防音特性からはリムの外周表面の広い範囲を覆うことが望ましく、一般には断面矩形の帯状とされる。   Further, the cross-sectional shape of the sound absorbing material is not particularly limited, but it is desirable to cover a wide range of the outer peripheral surface of the rim from the soundproofing property, and in general, it is a belt having a rectangular cross section.

本発明のタイヤ吸音材の最大の特徴は、リムに向かう表面と反対側の外周表面に滑り層を有しているところにある。この滑り層は、タイヤのビード部との摩擦抵抗が吸音材本体より小さければよいが、滑剤などを塗布するだけでは不十分であり、フィルム状とすることが望ましい。例えば、滑り層として樹脂フィルムを用いることができる。この樹脂フィルムの材質は熱可塑性又は熱硬化性を問わず、ポリエチレン、ポリプロピレン、ＡＢＳ、ポリスチレン、ポリウレタン、ポリアミド、ＰＥＴ、シリコーン、アクリル、フッ素樹脂、ポリアセタールなどから選択することができる。吸音材本体が発泡ウレタンから形成されている場合には、相性がよく接合強度に優れ耐久性にも優れたポリウレタンフィルムを用いることが望ましい。ポリウレタンフィルムを用いれば、延び性にも優れているので加工も容易である。   The greatest feature of the tire sound-absorbing material of the present invention is that it has a sliding layer on the outer peripheral surface opposite to the surface facing the rim. The sliding layer only needs to have a frictional resistance with the bead portion of the tire smaller than that of the sound-absorbing material main body, but it is not sufficient to apply a lubricant or the like, and it is desirable to form a film. For example, a resin film can be used as the sliding layer. The material of this resin film can be selected from polyethylene, polypropylene, ABS, polystyrene, polyurethane, polyamide, PET, silicone, acrylic, fluororesin, polyacetal, etc. regardless of thermoplasticity or thermosetting. When the sound-absorbing material body is made of urethane foam, it is desirable to use a polyurethane film that has good compatibility, excellent bonding strength, and excellent durability. If a polyurethane film is used, since it is excellent in extensibility, processing is also easy.

この樹脂フィルムは、吸音材本体とは別に形成されたものを吸音材本体に積層してもよいし、吸音材本体の成形時に金型内に樹脂フィルムを配置して一体成形することもできる。また吸音材本体を発泡ウレタンから形成する場合には、成形時に表面にインテグラルスキン層が形成されるので、そのインテグラルスキン層を滑り層とすることも可能である。   The resin film formed separately from the sound absorbing material main body may be laminated on the sound absorbing material main body, or may be integrally formed by placing the resin film in a mold when the sound absorbing material main body is formed. Further, when the sound absorbing material main body is formed from urethane foam, an integral skin layer is formed on the surface at the time of molding, so that the integral skin layer can be a sliding layer.

なお滑り層と吸音材本体とは接合されていなくてもよいが、リムへの組み付け性などを考慮すると、吸音材本体と少なくとも部分的に接合されていることが望ましい。   The sliding layer and the sound-absorbing material main body need not be joined, but it is desirable that the sliding layer and the sound-absorbing material main body are at least partially joined in consideration of ease of assembly to the rim.

滑り層の厚さは、厚いほど吸音材本体の破損を防止できるが、厚くなり過ぎると却って吸音特性が低下する場合がある。一方、表面に樹脂フィルムのような薄い滑り層を設けることで、滑り層がマス、吸音層がバネとして作用し、マス−バネ共振により低周波数域の騒音が低減されることも明らかとなっている。したがって滑り層の厚さは、タイヤ本体の着脱時に破損しない程度でできるだけ薄くすることが好ましく、例えば20〜 100μｍの範囲のものが好ましい。   As the thickness of the sliding layer increases, the sound absorbing material body can be prevented from being damaged. However, if the sliding layer is too thick, the sound absorbing characteristics may deteriorate. On the other hand, by providing a thin sliding layer such as a resin film on the surface, it becomes clear that the sliding layer acts as a mass and the sound absorption layer acts as a spring, and noise in the low frequency range is reduced by mass-spring resonance. Yes. Therefore, the thickness of the sliding layer is preferably as thin as possible so as not to be damaged when the tire body is attached or detached, and for example, a thickness in the range of 20 to 100 μm is preferable.

また滑り層は、表面に微細な凹凸を有することが好ましい。微細な凹凸によってタイヤの着脱時にビードと接触する面積が減少するため、摩擦抵抗がより小さくなり吸音材の損傷をさらに防止することができる。しかし凹凸が微細すぎたり大きくなるとその効果の発現が困難となるので、凹凸の頂部の間隔が 0.2〜２mm、凹凸の高低差が 0.5〜５mmの範囲とすることが望ましい。   The sliding layer preferably has fine irregularities on the surface. Since the area that comes into contact with the bead when the tire is attached or detached is reduced due to the fine unevenness, the frictional resistance is further reduced, and damage to the sound absorbing material can be further prevented. However, if the irregularities are too fine or large, it is difficult to achieve the effect. Therefore, it is desirable that the distance between the tops of the irregularities is 0.2 to 2 mm and the height difference of the irregularities is in the range of 0.5 to 5 mm.

なおタイヤは、従来用いられているものをそのまま用いることができる。例えば、ブタジエンゴム（ＢＲ）、スチレン−ブタジエンゴム（ＳＢＲ）、天然ゴム（ＮＲ）など、従来と同様の材料から従来と同様の断面略Ｕ字形状に形成することができる。もちろん各種繊維、カーボンブラック、シリカ、硫酸バリウムなどの充填材を従来と同様にゴム中に添加することもできる。ビードコア、ボディプライなどを埋設することができることももちろんである。   As the tire, a conventionally used tire can be used as it is. For example, it can be formed from a material similar to the conventional material, such as butadiene rubber (BR), styrene-butadiene rubber (SBR), natural rubber (NR), or the like, with a substantially U-shaped cross section similar to the conventional one. Of course, fillers such as various fibers, carbon black, silica, and barium sulfate can be added to the rubber as in the conventional case. Of course, bead cores and body plies can be buried.

以下、実施例により本発明を具体的に説明する。   Hereinafter, the present invention will be described specifically by way of examples.

（実施例１）
図１及び図２に本実施例のタイヤ吸音材を配設したリムにタイヤを装着した組立体と、その組立体に用いられている吸音材を示す。この組立体は、ゴム製で断面略Ｕ字状に形成されたタイヤ１と、リム２と、リム２の外周表面に接合された吸音材３とから構成されている。 (Example 1)
1 and 2 show an assembly in which a tire is mounted on a rim provided with the tire sound absorbing material of the present embodiment, and a sound absorbing material used in the assembly. The assembly includes a tire 1 made of rubber and having a substantially U-shaped cross section, a rim 2, and a sound absorbing material 3 joined to the outer peripheral surface of the rim 2.

吸音材３は断面矩形の帯状をなし、リム２の外周表面を一周して延在する収容溝20内に接合され、リム２の外周表面を一周している。この吸音材３は、発泡ポリウレタン製の吸音材本体30と、吸音材本体30の表面に一体的に積層されたウレタンフィルム31とから構成されている。ウレタンフィルム31がタイヤ１の内周面とリム２の外周面とで囲まれた空洞内に表出している。   The sound-absorbing material 3 has a rectangular cross-section, and is joined to a receiving groove 20 that extends around the outer peripheral surface of the rim 2, and goes around the outer peripheral surface of the rim 2. The sound absorbing material 3 includes a sound absorbing material main body 30 made of polyurethane foam and a urethane film 31 integrally laminated on the surface of the sound absorbing material main body 30. The urethane film 31 is exposed in a cavity surrounded by the inner peripheral surface of the tire 1 and the outer peripheral surface of the rim 2.

吸音材本体30の厚さは５mmであり、10倍発泡の成形品から形成されている。またウレタンフィルム31の厚さは、40μｍである。この吸音材３は、ウレタンフィルム31を発泡成形型内に配置した状態で吸音材本体30を発泡成形し、これによってウレタンフィルム31は吸音材本体30と一体的に接合されている。   The sound-absorbing material body 30 has a thickness of 5 mm and is formed from a 10-fold foamed molded product. The thickness of the urethane film 31 is 40 μm. The sound absorbing material 3 is formed by foam-molding the sound absorbing material main body 30 with the urethane film 31 placed in the foaming mold, whereby the urethane film 31 is integrally joined to the sound absorbing material main body 30.

（比較例１）
ウレタンフィルム31を積層することなく、吸音材本体30のみを比較例１の吸音材とした。 (Comparative Example 1)
Only the sound-absorbing material body 30 was used as the sound-absorbing material of Comparative Example 1 without laminating the urethane film 31.

＜試験例１＞
リム２として18× 7.5JJのホイールを用い、幅 115mmの吸音材（実施例１及び比較例１）を深さ５mm、幅 115mmの収容溝20にそれぞれ接着した。実施例１では、吸音材３の外周表面にはウレタンフィルム31が表出している。その状態で 245/45R18のタイヤ１（標準市販品）を着脱し、タイヤ１の着時と脱時における吸音材の表面の傷を目視で判定した。 <Test Example 1>
An 18 × 7.5JJ wheel was used as the rim 2, and a sound absorbing material having a width of 115 mm (Example 1 and Comparative Example 1) was bonded to the receiving groove 20 having a depth of 5 mm and a width of 115 mm. In Example 1, the urethane film 31 is exposed on the outer peripheral surface of the sound absorbing material 3. In this state, a 245 / 45R18 tire 1 (standard commercial product) was attached and detached, and scratches on the surface of the sound absorbing material when the tire 1 was put on and taken off were visually determined.

その結果、比較例１の吸音材では、特にタイヤの脱時にささくれ、傷、割れなどの損傷が認められたが、実施例１の吸音材３では、着時及び脱時ともに圧痕のみが認められ、ささくれ、傷、割れなどの損傷は全く認められなかった。   As a result, the sound-absorbing material of Comparative Example 1 was particularly damaged when the tire was taken off, and damages such as scratches and cracks were observed. However, the sound-absorbing material 3 of Example 1 showed only indentations when worn and taken off. No damage such as squeezing, scratching or cracking was observed.

＜試験例２＞
次に、吸音材本体の厚さ30を10mm及び20mmとしたこと以外は実施例１及び比較例１と同様の吸音材について、垂直入射吸音率測定法（JIS A 1405）に従って各周波数の音の吸音率をそれぞれ測定した。結果を表１及び図３に示す。 <Test Example 2>
Next, with respect to the sound absorbing material similar to Example 1 and Comparative Example 1 except that the thickness 30 of the sound absorbing material body was 10 mm and 20 mm, the sound of each frequency was measured according to the normal incident sound absorption rate measuring method (JIS A 1405). Each sound absorption coefficient was measured. The results are shown in Table 1 and FIG.

Figure 2005238888
表１及び図３より、ウレタンフィルムを積層することで、 100〜１KHz の低周波数域における吸音率が向上していることがわかる。また 250Hzにおける吸音率を吸音材本体の厚みに対してプロットしてみると、図４に示すように、吸音材本体の厚みと吸音率との関係はウレタンフィルムの有無に関係なく比例関係にあり、ウレタンフィルムを積層することで吸音率が向上しているので、この効果は吸音材本体の厚さには無関係に発現されていることも明らかである。
Figure 2005238888
 From Table 1 and FIG. 3, it can be seen that the sound absorption coefficient in the low frequency range of 100 to 1 kHz is improved by laminating the urethane film. In addition, when the sound absorption coefficient at 250 Hz is plotted against the thickness of the sound absorbing material body, as shown in FIG. 4, the relationship between the sound absorbing material body thickness and the sound absorption coefficient is proportional regardless of the presence or absence of the urethane film. Since the sound absorption rate is improved by laminating the urethane film, it is clear that this effect is manifested regardless of the thickness of the sound absorbing material body.

（実施例２）
ウレタンフィルム31の表面に、凹凸の頂部の間隔が 0.2〜２mm、凹凸の高低差が 0.5〜５mmのシボ模様を形成したこと以外は実施例１と同様の吸音材を実施例２とする。シボ模様は、成形型の型面に形成されていた模様が、吸音材本体30の成形時にウレタンフィルム31の表面に転写されたものである。この吸音材についても試験例１と同様に試験した結果、着時及び脱時ともに圧痕のみが認められ、ささくれ、傷、割れなどの損傷は全く認められなかった。 (Example 2)
A sound absorbing material similar to that of Example 1 is used in Example 2, except that a wrinkle pattern having a top-to-bottom spacing of 0.2 to 2 mm and a height difference of 0.5 to 5 mm is formed on the surface of the urethane film 31. The wrinkle pattern is a pattern formed on the mold surface of the mold and transferred to the surface of the urethane film 31 when the sound absorbing material body 30 is molded. This sound absorbing material was also tested in the same manner as in Test Example 1. As a result, only indentation was observed at the time of wearing and removal, and damage such as rolling, scratching, and cracking was not observed at all.

また実施例１と実施例２の吸音材について、試験例２と同様にして各周波数の音の吸音率をそれぞれ測定した。吸音材本体30の厚さは30mmである。結果を表２及び図５に示す。   For the sound absorbing materials of Example 1 and Example 2, the sound absorption rate of each frequency was measured in the same manner as in Test Example 2. The thickness of the sound absorbing material body 30 is 30 mm. The results are shown in Table 2 and FIG.

Figure 2005238888
表２及び図５から、ウレタンフィルム31の表面に細かな凹凸を形成することによって、 100〜１KHz の低周波数域における吸音率がさらに向上していることがわかる。
Figure 2005238888
 From Table 2 and FIG. 5, it can be seen that by forming fine irregularities on the surface of the urethane film 31, the sound absorption coefficient in a low frequency range of 100 to 1 KHz is further improved.

本発明のタイヤ吸音材は、自動車、産業車両、航空機などのリムとタイヤの組立体に利用することができ、タイヤの着脱時の損傷が防止されているので何度も利用することができ経済的である。また吸音特性がさらに向上するので、静粛性も向上し騒音をより防止することができる。   The tire sound-absorbing material of the present invention can be used for an assembly of a rim and a tire of an automobile, an industrial vehicle, an aircraft, etc., and can be used many times because damage at the time of attaching and detaching the tire is prevented. Is. In addition, since the sound absorption characteristics are further improved, silence can be improved and noise can be further prevented.

本発明の一実施例の吸音材を用いたタイヤ組付体の断面図である。It is sectional drawing of the tire assembly using the sound-absorbing material of one Example of this invention. 本発明の一実施例の吸音材を一部断面で示す要部斜視図である。It is a principal part perspective view which shows the sound-absorbing material of one Example of this invention in a partial cross section. 周波数と吸音率との関係を示すグラフである。It is a graph which shows the relationship between a frequency and a sound absorption coefficient. 吸音材本体の厚みと 250Hzの音の吸音率を示すグラフである。It is a graph which shows the thickness of a sound-absorbing material main body, and the sound absorption rate of a 250Hz sound. 周波数と吸音率との関係を示すグラフである。It is a graph which shows the relationship between a frequency and a sound absorption coefficient.

符号の説明Explanation of symbols

１：タイヤ ２：リム ３：吸音材
20：収容溝 30：吸音材本体 31：ウレタンフィルム（滑り層） 1: Tire 2: Rim 3: Sound absorbing material
20: Housing groove 30: Sound absorbing material body 31: Urethane film (sliding layer)

Claims (4)

断面略Ｕ字形状のタイヤの内周面とリムの外周面とで形成されるリング状空間内で該リムの外周表面にリング状に配設されるタイヤ吸音材であって、その外周表面には滑り層をもつことを特徴とするタイヤ吸音材。   A tire sound-absorbing material disposed in a ring shape on the outer peripheral surface of the rim in a ring-shaped space formed by the inner peripheral surface of the tire having a substantially U-shaped cross section and the outer peripheral surface of the rim. Is a tire sound-absorbing material characterized by having a sliding layer. 前記滑り層は樹脂フィルムである請求項１に記載のタイヤ吸音材。   The tire sound-absorbing material according to claim 1, wherein the sliding layer is a resin film. 前記滑り層は表面に微細な凹凸を有する請求項１又は請求項２に記載のタイヤ吸音材。   The tire sound-absorbing material according to claim 1, wherein the sliding layer has fine irregularities on a surface thereof. 発泡ウレタンからなり、前記滑り層はウレタンフィルムである請求項２又は請求項３に記載のタイヤ吸音材。
The tire sound absorbing material according to claim 2, wherein the tire sound absorbing material is made of urethane foam, and the sliding layer is a urethane film.
JP2004048481A 2004-02-24 2004-02-24 Tire sound absorbing material Pending JP2005238888A (en)

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Cited By (11)

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JP2006298299A (en) * 2005-04-25 2006-11-02 Yokohama Rubber Co Ltd:The Low-noise pneumatic tire
US8505677B2 (en) 2005-04-28 2013-08-13 The Yokohama Rubber Co, Ltd. Noise reducing device, manufacturing method for the noise reducing device, and pneumatic tire having the noise reducing device
DE102013012827A1 (en) 2012-08-02 2014-02-06 Toyo Tire & Rubber Co., Ltd. Arrangement of pneumatic tire and rim
US8910681B2 (en) 2005-04-28 2014-12-16 The Yokohama Rubber Co., Ltd. Noise reducing device, manufacturing method for the noise reducing device, and pneumatic tire having the noise reducing device
US8997806B2 (en) 2008-06-20 2015-04-07 The Yokohama Rubber Co., Ltd. Tire noise reduction device
US8997805B2 (en) 2005-04-28 2015-04-07 The Yokohama Rubber Co., Ltd. Pneumatic tire and method of manufacturing the same
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US8905099B2 (en) 2005-04-25 2014-12-09 The Yokohama Rubber Co., Ltd. Low noise pneumatic tire
WO2006115253A1 (en) * 2005-04-25 2006-11-02 The Yokohama Rubber Co., Ltd. Low noise pneumatic tire
JP4507970B2 (en) * 2005-04-25 2010-07-21 横浜ゴム株式会社 Low noise pneumatic tire
JP2006298299A (en) * 2005-04-25 2006-11-02 Yokohama Rubber Co Ltd:The Low-noise pneumatic tire
US8567464B2 (en) 2005-04-25 2013-10-29 The Yokohama Rubber Co., Ltd. Low noise pneumatic tire
US8915272B2 (en) 2005-04-28 2014-12-23 The Yokohama Rubber Co., Ltd. Noise reducing device, manufacturing method for the noise reducing device, and pneumatic tire having the noise reducing device
US8910681B2 (en) 2005-04-28 2014-12-16 The Yokohama Rubber Co., Ltd. Noise reducing device, manufacturing method for the noise reducing device, and pneumatic tire having the noise reducing device
US8505677B2 (en) 2005-04-28 2013-08-13 The Yokohama Rubber Co, Ltd. Noise reducing device, manufacturing method for the noise reducing device, and pneumatic tire having the noise reducing device
US8997805B2 (en) 2005-04-28 2015-04-07 The Yokohama Rubber Co., Ltd. Pneumatic tire and method of manufacturing the same
US9211685B2 (en) 2005-04-28 2015-12-15 The Yokohama Rubber Co., Ltd. Pneumatic tire and method of manufacturing the same
US8997806B2 (en) 2008-06-20 2015-04-07 The Yokohama Rubber Co., Ltd. Tire noise reduction device
DE102013012827A1 (en) 2012-08-02 2014-02-06 Toyo Tire & Rubber Co., Ltd. Arrangement of pneumatic tire and rim
US9315076B2 (en) 2012-08-02 2016-04-19 Toyo Tire & Rubber Co., Ltd. Assembly of pneumatic tire and rim
US10632790B2 (en) 2014-09-12 2020-04-28 Bridgestone Corporation Pneumatic tire
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