JP2004106567A - Elastic wheel - Google Patents

Elastic wheel Download PDF

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Publication number
JP2004106567A
JP2004106567A JP2002267990A JP2002267990A JP2004106567A JP 2004106567 A JP2004106567 A JP 2004106567A JP 2002267990 A JP2002267990 A JP 2002267990A JP 2002267990 A JP2002267990 A JP 2002267990A JP 2004106567 A JP2004106567 A JP 2004106567A
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JP
Japan
Prior art keywords
wheel
elastic body
rubber elastic
guides
rim
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002267990A
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Japanese (ja)
Inventor
Katsumi Tashiro
田代 勝巳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Topy Industries Ltd
Original Assignee
Bridgestone Corp
Topy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp, Topy Industries Ltd filed Critical Bridgestone Corp
Priority to JP2002267990A priority Critical patent/JP2004106567A/en
Publication of JP2004106567A publication Critical patent/JP2004106567A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic wheel with improved seating comfortableness, vibration proofing, soundproofing without impairing durability and safety from a timing with a small input to a timing with a large input, and good serviceability for fatigue resistance for a long-term use. <P>SOLUTION: This is an elastic wheel having guides 5a, 5b fixed at a rim 2, and a protruding part 4 to be protruded at an outer-periphery surface of a disc 1, and in which a rubber elastic body 3 is stuck at the protruding part 4 and the guides 5a, 5b. The outer peripheral surface of the rubber elastic body 3 is a corrugated condition which has a point of inflexion P and forms a recessed part at an inner part in a wheel radius direction at least between the protruding part 4 and the pair of guides 5a, 5b along the wheel shaft direction. An angle θ between an end part inclination bent surface SA adjacent to a stuck part of the rubber elastic body 3 and the guides 5a, 5b on the corrugated conditioned outer-periphery surface and an adjacent inclination bent surface SB connected to the end part inclination bent surface SA through the point of inflexion P is in a range of 90-180°. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、車両の車輪に用いられる弾性ホイールに関し、詳しくは、乗り心地性能、防振性能および防音性能に優れるとともに、長期使用時の耐久性にも優れた弾性ホイールに関する。
【0002】
【従来の技術】
弾性ホイールは、一般に車軸ハブに固着されるディスクとタイヤを支承するリムとを備えており、かかるディスクとリムとの間に防振体を設け、防振性能や乗り心地性能を高めた弾性ホイールはこれまで種々提案されている。例えば、特許文献1には、防振体としてバネを用いて乗り心地の向上を図ったタイヤ用ホイールが提案されている。
【0003】
また、防振体としてゴムを使用し、これをリムとディスクとの間に配置したものも知られており、例えば、特許文献2に、リムがゴム様弾性体を介してディスクに連結される構成の弾性ホイールが提案されている。さらに、特許文献3には、リムと弾性ホイールとの間に隙間を形成し、そこに防振ゴムを介装させた弾性ホイールが開示されている。さらにまた、特許文献4には、リムと同一プロファイルを有する内側リムとリムとの間にゴムの環状ストリップを配置したホイール・バリア組立体が開示されている。
【0004】
【特許文献1】
実開昭59−188701号公報(特許請求の範囲等)
【特許文献2】
実開昭57−73203号公報(特許請求の範囲等)
【特許文献3】
特開平5−338401号公報(特許請求の範囲等)
【特許文献4】
WO9833666号公報(請求の範囲等)
【0005】
【発明が解決しようとする課題】
しかしながら、防振体としてゴムを使用し、これをリムとディスクとの間に一様に配置した従来の弾性ホイールにおいては、リムの内周面とディスクの外周面との間に夫々に加硫接着されたゴム弾性体が配設されているため、このゴム弾性体によりリムからディスクに伝わる軸方向、径方向および回転方向の各振動を的確に抑制することができるものの、大荷重時のゴム弾性体の変位を抑制することはできないという問題があった。すなわち、ゴムの断面が一様であり、小入力時から大入力時までのそれぞれにおいて適切な振動防止特性を得ることが困難であった。この点について、防振体としてばねを用いても同様の問題があった。
【0006】
また、リムとディスクとの間にゴム弾性体を配置して防振効果を得る弾性ホイールの場合には、実車に装着して走行した際にゴム弾性体に応力負荷がかかるので、長期使用時におけるゴム弾性体の疲労破壊が問題となる。従って、単に防振性能等を高めることのみならず、実使用時におけるゴム弾性体の耐久性を向上して、十分な実用性を備えた弾性ホイールを実現することが望まれていた。
【0007】
そこで本発明の目的は、小入力時から大入力時に至るまで、耐久性および安全性を損なうことなく、乗り心地性能、防振性能および防音性能の向上を図るとともに、防振機能を担うゴム弾性体の耐久性を向上して、長期使用時における疲労耐久性にも優れた実用性の高い弾性ホイールを提供することにある。
【0008】
【課題を解決するための手段】
本発明者らは、上記課題を解決すべく鋭意検討した結果、所定の構成にてゴム弾性体を配した弾性ホイールにおいて、ゴム弾性体が破壊を生じやすい所定部位の形状を改良して、該部位における応力集中を緩和させることにより、上記目的を達成し得ることを見出し、本発明を完成するに至った。即ち、上記課題を解決するために、本発明の弾性ホイールは下記に示す通りである。
【0009】
〈1〉車軸ハブに固着されるディスクと、タイヤを支承するリムとを備え、前記リムの内周面に環状に固設された一対のガイドと、前記ディスクの外周面にホイール半径方向外方に環状に突出する突出部とを有し、該突出部に、前記リムの内周面との間に間隙をもって、前記一対のガイド間のホイール軸方向の全幅にわたって一体的に、ゴム弾性体が環状に固着され、かつ、軸方向両側に延在する該ゴム弾性体の両端部が、夫々前記一対のガイドのホイール軸方向に対向する両側面に固着された弾性ホイールであって、
前記ゴム弾性体の外周面が、ホイール軸方向に沿って、少なくとも前記突出部と一対のガイドとの間に夫々、ホイール半径方向内方に凹部を形成する変曲点を有する波形状であり、かつ、該波形状の外周面の、前記ゴム弾性体とガイドとの固着部近傍における端部傾斜曲面SAと、前記変曲点を介して該端部傾斜曲面SAにつながる隣接する傾斜曲面SBとのなす角θが、90〜180°の範囲内であることを特徴とする弾性ホイールである。
【0010】
〈2〉前記〈1〉の弾性ホイールにおいて、前記端部傾斜曲面SAがホイール半径方向に対しなす角αが、20〜90°の範囲内である弾性ホイールである。
【0011】
〈3〉前記〈1〉または〈2〉の弾性ホイールにおいて、前記ゴム弾性体の、前記端部傾斜曲面SAにおける前記ガイドとの固着部の厚みtが、0.5〜2.5mmの範囲内である弾性ホイールである。
【0012】
〈4〉前記〈1〉〜〈3〉のうちいずれかの弾性ホイールにおいて、前記ゴム弾性体とガイドとの固着部の、前記端部傾斜曲面SAに沿う長さが、1.5mm以上である弾性ホイールである。
【0013】
前記〈1〉〜〈4〉の発明は、以下の作用効果を奏する。
前記〈1〉の発明により、リムとディスクとの間に介装されたゴム弾性体の剪断変形で振動を吸収し、特に小入力に対して乗り心地性能、防振性能および防音性能の向上を図ることができるとともに、ディスク外周面上のホイール半径方向外方に設置されたゴム弾性体がストッパの役割を果たし、大入力に対する大変形をも効果的に抑制することができる。また、ゴム弾性体の所定形状により応力の集中を緩和して、長期使用時におけるゴム弾性体の疲労耐久性を向上し、耐久性にも優れた弾性ホイールとすることができる。さらに、防音性能については、100Hz以上の高周波領域の防音に極めて効果的である。
【0014】
前記〈2〉〜〈4〉の発明により、ゴム弾性体の所定部位における応力集中をより効果的に緩和することができ、ゴム弾性体の耐久性をより高めることができる。
【0015】
【発明の実施の形態】
以下、本発明の実施の形態について説明する。
図1に示す本発明の一実施の形態に係る弾性ホイールは、車軸ハブ(図示せず)に固着されるディスク1と、タイヤを支承するリム2とを備えており、リム2の内周面とディスク1の外周面との間に、ゴム弾性体3が環状に介装されている。
【0016】
図1に示す好適例においては、ディスク1の外周面が、ホイール半径方向外方に環状に突出する突出部4を一体的に形成している。この突出部4には、ホイール軸方向両側に延在するゴム弾性体3が、リム2の内周面との間に適宜間隙をもって、例えば、加硫接着等により、環状に固着されている。
【0017】
一方、リム2の内周面には一対のガイド5a、5bが環状に固設されており、上記ゴム弾性体3の軸方向両端部がこの一対のガイド5a、5bのホイール軸方向に対向する両側面に夫々加硫接着等により固着されることにより、ゴム弾性体3を介してリム2とディスク1とが連結されている。尚、ガイド5a、5bはリム2の内周面に溶接、ネジ止め等の手段により固着してもよく、あるいはリムと一体成形により設けてもよい。
【0018】
ゴム弾性体3は、少なくともホイール軸方向両側に延在すれば、その剪断歪みにより弾性ホイールとしての防振機能を発揮し得るが、本発明においては、さらに大入力時の大変形の防止効果をも得るために、図示するように、ゴム弾性体3をリム2の内周面とディスク1の突出部4との間にも介在させている。即ち、ゴム弾性体3を、一対のガイド5a、5b間のホイール軸方向の全幅にわたって一体的に介装させることにより、小入力時の小変形の抑制、防止効果が得られることに加え、ゴム弾性体3の突出部4のホイール半径方向外方面に連続的に存在する部分に、大入力時において突出部4とリム2の内周面との衝突を回避するためのストッパとしての機能を発揮させることができる。
【0019】
図2に、ゴム弾性体3とガイド5aとの固着部近傍(片側)の拡大部分断面図を示す。以下、図示するガイド5a側の固着部に関して本発明を説明するが、かかる固着部近傍の特徴に関しては、ホイール軸方向両端部において同様である。図1および2に示すように、ゴム弾性体3は、その外周面が、ホイール軸方向に沿って、少なくとも突出部4と一対のガイド5a、5bとの間に夫々、ホイール半径方向内方に凹部を形成する変曲点Pを有する波形状に形成されている。本発明においては、かかる波形状の外周面の、ゴム弾性体3と一対のガイド5a、5bとの固着部近傍における端部傾斜曲面SAと、変曲点Pを介してこの端部傾斜曲面SAにつながる隣接する傾斜曲面SBとのなす角θが、90〜180°、好ましくは120〜180°の範囲内である(図2参照)。角θを90〜180°の範囲内としたことにより、実使用時に負荷のかかりやすい固着部近傍における応力集中を効果的に緩和することができ、ゴム弾性体3の疲労破壊を適切に防止することができる。角θが90°未満であると変曲点P付近に応力が集中しすぎて、ゴム弾性体3の破断による弾性ホイールの故障が起きやすくなる。一方、角θが180°を超えると、防振特性等が低下するので、好ましくない。
【0020】
本発明に係るゴム弾性体3においては、角θに関し上記条件を満たしていればよく、その他の全体的な形状、突出部を中心としたホイール軸方向両側のバランスなどについては、特に制限はされるものではないが、好適には上記条件に加え、端部傾斜曲面SAがホイール半径方向に対しなす角αを、20〜90°、特には40〜90°の範囲内とする。αが20°未満であると、突出部4とガイド5aとの間に形成される凹部が深くなりすぎて、この凹部におけるゴム弾性体3の強度が低下し、この部分から破断が生じやすくなる。一方、αが90°を超えると、防振特性等が低下するので、好ましくない。
【0021】
また、本発明においては、ゴム弾性体3の、端部傾斜曲面SAにおけるガイド5aとの固着部の厚みtが、好ましくは0.5〜2.5mm、より好ましくは1.0〜1.5mmの範囲内である。厚みtが0.5mm未満であると、薄すぎて製造上困難となるので好ましくなく、一方、2.5mmを超えると、実使用時にゴム弾性体3が端部傾斜曲面SA上をせり上がって、ゴム弾性体3とガイド5aとの固着部端部Eにて応力集中が生ずるので、好ましくない。
【0022】
さらに、ゴム弾性体3とガイド5aとの固着部の、端部傾斜曲面SAに沿う長さLが、好ましくは1.5mm以上、より好ましくは5mm程度である。長さLが1.5mm未満であると、防振特性等が低下するので好ましくない。
【0023】
ディスク1は、スポークやメッシュ等の支持体と組合わせたスポークホイールやメッシュホイール等であってもよい。また、ディスクの材質は、スチール、アルミニウム、マグネシウム、チタン、合成樹脂等、いずれの材質でもよいが、軽量化に主眼を置くときはアルミニウム、チタンまたは合成樹脂が好ましい。
【0024】
また、突出部4は、図示する例には限られず、ディスク1の外周面にベースリムを設け、その半径方向外方に、少なくともホイール軸方向両側に延在するゴム弾性体3を固着することのできる環状部材を固着することにより設けてもよい。もちろん、形状についても図示する例に限られるものではない。尚、本発明の弾性ホイールにおいては、リム2自体の構造については特に制限されず、例えば、リム組を容易にするために、図示するように、ドロップ部を設けておいてもよい。
【0025】
本発明において使用し得るゴム弾性体3は、防振ゴムとして既知のものを用いることができ、天然ゴムや合成ゴム、例えば、ブタジエンゴム、スチレンブタジエン共重合体ゴム、ブチルゴム等のジエン系ゴムに適宜配合剤、例えば、硫黄、加硫促進剤、老化防止剤、カーボンブラック等を適宜配合することにより調製することができる。かかるゴム弾性体のJIS−A硬度(Hd)は、振動吸収特性と耐久性の観点から、好ましくは30〜80°であり、弾性率は1×10〜1×10N/cmである。
【0026】
【発明の効果】
以上説明してきたように、本発明によれば、小入力時から大入力時に至るまで、耐久性および安全性を損なうことなく、乗り心地性能、防振性能および防音性能の向上を図るとともに、防振機能を担うゴム弾性体の耐久性を向上して、長期使用時における疲労耐久性にも優れた実用性の高い弾性ホイールを提供することができる。
【図面の簡単な説明】
【図1】本発明の一実施の形態に係る弾性ホイールの拡大部分断面図である。
【図2】ゴム弾性体とガイドとの固着部近傍の拡大部分断面図である。
【符号の説明】
1 ディスク
2 リム
3 ゴム弾性体
4 突出部
5a,5b ガイド
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elastic wheel used for a wheel of a vehicle, and more particularly, to an elastic wheel having excellent ride comfort, vibration proof performance, and sound proof performance, and also having excellent durability in long-term use.
[0002]
[Prior art]
The elastic wheel generally includes a disc fixed to the axle hub and a rim for supporting the tire. An elastic wheel is provided between the disc and the rim to improve vibration isolation performance and ride comfort. Has been proposed so far. For example, Patent Literature 1 proposes a tire wheel that uses a spring as a vibration isolator to improve riding comfort.
[0003]
Further, there is also known an apparatus using rubber as a vibration isolator and disposing the rubber between a rim and a disk. For example, in Patent Document 2, a rim is connected to a disk via a rubber-like elastic body. An elastic wheel with a configuration has been proposed. Further, Patent Literature 3 discloses an elastic wheel in which a gap is formed between a rim and an elastic wheel, and an anti-vibration rubber is interposed in the gap. Further, Patent Document 4 discloses a wheel barrier assembly in which an annular rubber strip is disposed between an inner rim and a rim having the same profile as the rim.
[0004]
[Patent Document 1]
JP-A-59-188701 (claims, etc.)
[Patent Document 2]
Japanese Utility Model Publication No. 57-73203 (Claims, etc.)
[Patent Document 3]
JP-A-5-338401 (Claims, etc.)
[Patent Document 4]
WO9833666 (Claims, etc.)
[0005]
[Problems to be solved by the invention]
However, in a conventional elastic wheel that uses rubber as a vibration isolator and uniformly arranges it between the rim and the disk, the rubber is vulcanized between the inner peripheral surface of the rim and the outer peripheral surface of the disk. Since the bonded rubber elastic body is provided, the rubber elastic body can accurately suppress the axial, radial, and rotational vibrations transmitted from the rim to the disk, but the rubber under heavy load There is a problem that displacement of the elastic body cannot be suppressed. That is, the rubber has a uniform cross section, and it has been difficult to obtain an appropriate vibration-preventing characteristic in each of a small input and a large input. In this regard, there is a similar problem even if a spring is used as the vibration isolator.
[0006]
Also, in the case of an elastic wheel that places a rubber elastic body between the rim and the disk to obtain a vibration damping effect, a stress load is applied to the rubber elastic body when the vehicle is mounted on an actual vehicle and traveled, so that it can be used for a long time. In this case, fatigue destruction of the rubber elastic body becomes a problem. Therefore, it has been desired to realize an elastic wheel with sufficient practicality by not only simply improving the vibration isolation performance and the like, but also improving the durability of the rubber elastic body in actual use.
[0007]
Therefore, an object of the present invention is to improve the ride comfort, vibration proof performance, and sound proof performance without impairing durability and safety from a small input to a large input, and to provide a rubber elastic member having a vibration proof function. An object of the present invention is to provide a highly practical elastic wheel having improved body durability and excellent fatigue durability during long-term use.
[0008]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above problems, and as a result, in an elastic wheel in which a rubber elastic body is arranged in a predetermined configuration, the shape of a predetermined portion where the rubber elastic body is likely to break is improved, The present inventors have found that the above object can be achieved by alleviating the stress concentration at the site, and have completed the present invention. That is, in order to solve the above problems, the elastic wheel of the present invention is as described below.
[0009]
<1> A disk fixed to the axle hub and a rim for supporting the tire, a pair of guides fixed to the inner peripheral surface of the rim in a ring shape, and a radially outer surface of the disk on the outer peripheral surface of the disk. A rubber elastic body is integrally formed over the entire width in the wheel axis direction between the pair of guides, with a gap between the protrusion and the inner peripheral surface of the rim. An elastic wheel fixed to an annular shape, and both ends of the rubber elastic body extending on both sides in the axial direction are fixed to both side surfaces of the pair of guides opposed to each other in the wheel axis direction,
The outer peripheral surface of the rubber elastic body has a wave shape having an inflection point forming a concave portion inward in the wheel radial direction, at least between the protruding portion and the pair of guides, along the wheel axis direction, And, on the outer peripheral surface of the wavy shape, an end inclined curved surface SA near the fixing portion between the rubber elastic body and the guide, and an adjacent inclined curved surface SB connected to the end inclined curved surface SA via the inflection point. Is in the range of 90 to 180 °.
[0010]
<2> The elastic wheel according to <1>, wherein an angle α formed by the end inclined surface SA with respect to a wheel radial direction is within a range of 20 to 90 °.
[0011]
<3> In the elastic wheel according to <1> or <2>, a thickness t of a fixing portion of the rubber elastic body with the guide at the end inclined curved surface SA is in a range of 0.5 to 2.5 mm. Is an elastic wheel.
[0012]
<4> In any one of the above-mentioned <1> to <3>, the length of the fixed portion between the rubber elastic body and the guide along the end inclined curved surface SA is 1.5 mm or more. It is an elastic wheel.
[0013]
The inventions <1> to <4> have the following functions and effects.
According to the invention of <1>, the vibration is absorbed by the shear deformation of the rubber elastic body interposed between the rim and the disk, and the riding comfort performance, the vibration proof performance and the sound proof performance are improved especially for a small input. In addition to this, the rubber elastic body provided on the outer peripheral surface of the disk in the radial direction of the wheel plays the role of a stopper, so that large deformation due to a large input can be effectively suppressed. In addition, the concentration of stress is reduced by the predetermined shape of the rubber elastic body, thereby improving the fatigue durability of the rubber elastic body during long-term use, thereby providing an elastic wheel having excellent durability. Further, the soundproofing performance is extremely effective for soundproofing in a high frequency region of 100 Hz or more.
[0014]
According to the inventions of <2> to <4>, the concentration of stress at a predetermined portion of the rubber elastic body can be more effectively reduced, and the durability of the rubber elastic body can be further increased.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
An elastic wheel according to an embodiment of the present invention shown in FIG. 1 includes a disk 1 fixed to an axle hub (not shown) and a rim 2 for supporting a tire. A rubber elastic body 3 is annularly interposed between the disk 1 and the outer peripheral surface of the disk 1.
[0016]
In the preferred example shown in FIG. 1, the outer peripheral surface of the disk 1 integrally forms a projection 4 that projects annularly outward in the wheel radial direction. Rubber elastic members 3 extending on both sides in the axial direction of the wheel are fixed to the protruding portion 4 in an annular manner, for example, by vulcanization bonding or the like, with an appropriate gap between the rubber elastic member 3 and the inner peripheral surface of the rim 2.
[0017]
On the other hand, a pair of guides 5a and 5b are fixed to the inner peripheral surface of the rim 2 in a ring shape, and both ends of the rubber elastic body 3 in the axial direction face the pair of guides 5a and 5b in the wheel axis direction. The rim 2 and the disk 1 are connected via rubber elastic bodies 3 by being fixed to both side surfaces by vulcanization bonding or the like. The guides 5a and 5b may be fixed to the inner peripheral surface of the rim 2 by welding, screwing, or the like, or may be provided integrally with the rim.
[0018]
If the rubber elastic body 3 extends at least on both sides in the axial direction of the wheel, the rubber strainer 3 can exhibit an anti-vibration function as an elastic wheel due to its shear strain. In the present invention, however, the effect of preventing large deformation at a large input is further improved. As shown in the figure, the rubber elastic body 3 is also interposed between the inner peripheral surface of the rim 2 and the protrusion 4 of the disk 1 as shown in FIG. That is, by interposing the rubber elastic body 3 integrally over the entire width in the wheel axis direction between the pair of guides 5a and 5b, in addition to the effect of suppressing and preventing small deformation at the time of small input, the rubber The portion of the elastic body 3 that continuously exists on the outer surface in the wheel radial direction of the protrusion 4 functions as a stopper for avoiding collision between the protrusion 4 and the inner peripheral surface of the rim 2 at the time of large input. Can be done.
[0019]
FIG. 2 is an enlarged partial cross-sectional view of the vicinity (one side) of the fixing portion between the rubber elastic body 3 and the guide 5a. Hereinafter, the present invention will be described with respect to the illustrated fixed portion on the guide 5a side, but the features near the fixed portion are the same at both ends in the wheel axial direction. As shown in FIGS. 1 and 2, the rubber elastic body 3 has an outer peripheral surface at least between the protruding portion 4 and the pair of guides 5a, 5b in the wheel radial direction in the wheel axial direction. It is formed in a wave shape having an inflection point P that forms a concave portion. In the present invention, the end inclined curved surface SA near the fixing portion between the rubber elastic body 3 and the pair of guides 5a and 5b on the outer peripheral surface of the wave shape, and the end inclined curved surface SA via the inflection point P Is in the range of 90 to 180 °, preferably 120 to 180 ° (see FIG. 2). By setting the angle θ in the range of 90 to 180 °, stress concentration in the vicinity of the fixing portion where a load is likely to be applied during actual use can be effectively reduced, and the fatigue failure of the rubber elastic body 3 is appropriately prevented. be able to. If the angle θ is less than 90 °, stress will be concentrated too much near the inflection point P, and the elastic wheel 3 will be easily broken due to the breakage of the rubber elastic body 3. On the other hand, if the angle θ exceeds 180 °, the vibration-proofing properties and the like deteriorate, which is not preferable.
[0020]
In the rubber elastic body 3 according to the present invention, it suffices that the above condition is satisfied with respect to the angle θ, and there are no particular restrictions on other overall shapes, balance on both sides in the wheel axial direction around the protrusion, and the like. Although not limited thereto, preferably, in addition to the above conditions, the angle α formed by the end inclined curved surface SA with respect to the wheel radial direction is in the range of 20 to 90 °, particularly 40 to 90 °. If α is less than 20 °, the concave portion formed between the protrusion 4 and the guide 5a becomes too deep, the strength of the rubber elastic body 3 in this concave portion is reduced, and breakage tends to occur from this portion. . On the other hand, if α exceeds 90 °, the vibration-proof properties and the like deteriorate, which is not preferable.
[0021]
Further, in the present invention, the thickness t of the portion of the rubber elastic body 3 that is fixed to the guide 5a on the curved end surface SA is preferably 0.5 to 2.5 mm, more preferably 1.0 to 1.5 mm. Is within the range. When the thickness t is less than 0.5 mm, it is not preferable because the thickness is too thin and the production becomes difficult. On the other hand, when the thickness t exceeds 2.5 mm, the rubber elastic body 3 rises on the inclined surface SA at the time of actual use. However, stress concentration occurs at the end E of the fixed portion between the rubber elastic body 3 and the guide 5a, which is not preferable.
[0022]
Further, the length L of the fixing portion between the rubber elastic body 3 and the guide 5a along the curved surface SA at the end is preferably 1.5 mm or more, more preferably about 5 mm. If the length L is less than 1.5 mm, vibration-proof characteristics and the like are undesirably reduced.
[0023]
The disk 1 may be a spoke wheel, a mesh wheel or the like in combination with a support such as a spoke or a mesh. The material of the disk may be any material such as steel, aluminum, magnesium, titanium, and synthetic resin. However, when focusing on weight reduction, aluminum, titanium or synthetic resin is preferable.
[0024]
The protrusion 4 is not limited to the example shown in the drawing, but may be provided with a base rim on the outer peripheral surface of the disk 1 and fixing the rubber elastic body 3 extending at least on both sides in the wheel axial direction outward of the base rim. It may be provided by fixing a possible annular member. Of course, the shape is not limited to the illustrated example. In the elastic wheel of the present invention, the structure of the rim 2 itself is not particularly limited. For example, a drop portion may be provided as shown in the figure to facilitate rim assembly.
[0025]
As the rubber elastic body 3 that can be used in the present invention, those known as anti-vibration rubbers can be used, and natural rubbers and synthetic rubbers, such as butadiene rubber, styrene-butadiene copolymer rubber, and diene rubber such as butyl rubber, can be used. It can be prepared by appropriately compounding an appropriate compounding agent, for example, sulfur, a vulcanization accelerator, an antioxidant, carbon black and the like. The JIS-A hardness (Hd) of the rubber elastic body is preferably 30 to 80 ° from the viewpoint of vibration absorption characteristics and durability, and the elastic modulus is 1 × 10 3 to 1 × 10 5 N / cm 2 . is there.
[0026]
【The invention's effect】
As described above, according to the present invention, from the time of a small input to the time of a large input, it is possible to improve the riding comfort performance, the vibration-proof performance, and the sound-proof performance without deteriorating the durability and safety, and at the same time, to improve the safety. It is possible to improve the durability of the rubber elastic body having the vibration function, and to provide a highly practical elastic wheel having excellent fatigue durability in long-term use.
[Brief description of the drawings]
FIG. 1 is an enlarged partial sectional view of an elastic wheel according to an embodiment of the present invention.
FIG. 2 is an enlarged partial cross-sectional view near a fixing portion between a rubber elastic body and a guide.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disc 2 Rim 3 Rubber elastic body 4 Projection part 5a, 5b Guide

Claims (4)

車軸ハブに固着されるディスクと、タイヤを支承するリムとを備え、前記リムの内周面に環状に固設された一対のガイドと、前記ディスクの外周面にホイール半径方向外方に環状に突出する突出部とを有し、該突出部に、前記リムの内周面との間に間隙をもって、前記一対のガイド間のホイール軸方向の全幅にわたって一体的に、ゴム弾性体が環状に固着され、かつ、軸方向両側に延在する該ゴム弾性体の両端部が、夫々前記一対のガイドのホイール軸方向に対向する両側面に固着された弾性ホイールであって、
前記ゴム弾性体の外周面が、ホイール軸方向に沿って、少なくとも前記突出部と一対のガイドとの間に夫々、ホイール半径方向内方に凹部を形成する変曲点を有する波形状であり、かつ、該波形状の外周面の、前記ゴム弾性体とガイドとの固着部近傍における端部傾斜曲面SAと、前記変曲点を介して該端部傾斜曲面SAにつながる隣接する傾斜曲面SBとのなす角θが、90〜180°の範囲内であることを特徴とする弾性ホイール。
A disk fixed to the axle hub and a rim for supporting the tire, a pair of guides fixed in an annular shape on the inner peripheral surface of the rim, and a ring radially outward on the outer peripheral surface of the disc in the wheel radial direction. A rubber elastic body is annularly fixed to the projecting portion integrally with the projecting portion over the entire width in the wheel axial direction between the pair of guides with a gap between the inner peripheral surface of the rim and the projecting portion. And, both ends of the rubber elastic body extending on both sides in the axial direction are elastic wheels fixed to both side surfaces of the pair of guides facing each other in the wheel axis direction,
The outer peripheral surface of the rubber elastic body has a wave shape having an inflection point forming a concave portion inward in the wheel radial direction, at least between the protruding portion and the pair of guides, along the wheel axis direction, And, on the outer peripheral surface of the wavy shape, an end inclined curved surface SA near the fixing portion between the rubber elastic body and the guide, and an adjacent inclined curved surface SB connected to the end inclined curved surface SA via the inflection point. An elastic wheel having an angle θ in the range of 90 to 180 °.
前記端部傾斜曲面SAがホイール半径方向に対しなす角αが、20〜90°の範囲内である請求項1記載の弾性ホイール。The elastic wheel according to claim 1, wherein an angle α formed by the end inclined curved surface SA with respect to the wheel radial direction is within a range of 20 to 90 °. 前記ゴム弾性体の、前記端部傾斜曲面SAにおける前記ガイドとの固着部の厚みtが、0.5〜2.5mmの範囲内である請求項1または2記載の弾性ホイール。3. The elastic wheel according to claim 1, wherein a thickness t of a fixing portion of the rubber elastic body with the guide on the end inclined curved surface SA is in a range of 0.5 to 2.5 mm. 4. 前記ゴム弾性体とガイドとの固着部の、前記端部傾斜曲面SAに沿う長さが、1.5mm以上である請求項1〜3のうちいずれか一項記載の弾性ホイール。The elastic wheel according to any one of claims 1 to 3, wherein a length of the fixing portion between the rubber elastic body and the guide along the end inclined surface SA is 1.5 mm or more.
JP2002267990A 2002-09-13 2002-09-13 Elastic wheel Pending JP2004106567A (en)

Priority Applications (1)

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