JP3806796B2 - Damper pulley manufacturing method - Google Patents

Damper pulley manufacturing method Download PDF

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Publication number
JP3806796B2
JP3806796B2 JP24085499A JP24085499A JP3806796B2 JP 3806796 B2 JP3806796 B2 JP 3806796B2 JP 24085499 A JP24085499 A JP 24085499A JP 24085499 A JP24085499 A JP 24085499A JP 3806796 B2 JP3806796 B2 JP 3806796B2
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Japan
Prior art keywords
rubber
ethylene
olefin
pulley
damper pulley
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JP24085499A
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Japanese (ja)
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JP2001065668A (en
Inventor
悟美 渡辺
和俊 三宅
宏 横井
英幸 今井
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Priority to JP24085499A priority Critical patent/JP3806796B2/en
Priority to DE60000642T priority patent/DE60000642T2/en
Priority to EP00118394A priority patent/EP1079140B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H55/00Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32Friction members
    • F16H55/36Pulleys
    • F16H2055/366Pulleys with means providing resilience or vibration damping

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  • Pulleys (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、ハブとプーリとの間に形成される環状空間に加硫ゴム部材が単純圧入・固定されてなるダンパプーリの製造方法に関する。
【0002】
また、以下の説明で、配合単位は、特に断らない限り、重量単位である。
【0003】
【従来の技術】
図1に示す如く、ダンパプーリ18おけるハブ12とプーリ14との間に形成される環状空間に単純圧入・固定される加硫ゴム部材16としては、従来、NR/SBR、SBR、塩素化IIR、NBR、水添NBR等のゴム材料で形成されていた(特開昭62−297557号公報)。
【0004】
【発明が解決しようとする課題】
しかし、昨今のエンジンルーム内の温度上昇に伴う耐熱性向上の要求には、これらのゴム材料で形成した加硫ゴム部材では、対応し難くなっている。
【0005】
そこで、該加硫ゴム部材の材料として、一般に耐熱性に優れたエチレンプロピレン系ゴム材料、即ち、エチレン・α−オレフィン系共重合体ゴム材料を使用することが考えられる。
【0006】
そして、ダンパのハブ及びプーリは、通常、金属製(鋳鉄、アルミニウム等の金属製)であり、エチレンプロピレン系ゴム(EOR系)材料等の非極性ゴム材料で形成した加硫ゴム部材16では、所定の圧縮率で圧入した場合、十分な固着力(プーリ滑り初めトルク)を得難いことが分かった(特に、耐熱老化後において)。
【0007】
本発明は、上記にかんがみて、高温雰囲気下でも、単純圧入・固定タイプのダンパプーリにおいて、ハブ及び/またはプーリと加硫ゴム部材との間の結合性(固着性)に問題が発生し難いダンパプーリが得られるダンパプーリの製造方法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、上記課題を解決するために、鋭意開発に努力をする過程で、ゴム配合物に、加硫時において非極性ゴムと反応可能でかつ極性基を備えた対金属粘着性付与剤を配合すればよいことを見出し、下記構成のダンパプーリの製造方法に想到した。
【0009】
少なくともプーリ側が金属製であるハブとプーリとの環状空間に加硫ゴム部材が単純圧入・固定されてなるダンパプーリの製造方法において、
前記加硫ゴム部材が、非極性ゴムをベースとし、高級脂肪酸系の加工助剤を含有するゴム配合物の加硫物であって、
前記ゴム配合物が、加硫時において前記非極性ゴムと反応可能でかつ極性基を備えた対金属粘着性付与剤が配合されてなることを特徴とする。
【0010】
上記構成において、加工助剤の配合量が、加工性に問題が発生しない量以上で通常配合量以下とするとともに、前記対金属粘着性付与剤の配合量が、対金属粘着性付与の効果を奏する量以上で、前記弾性体の圧縮永久歪みを阻害しない範囲の量以下であることが望ましい。
【0011】
本発明の別の態様は、少なくともプーリ側が金属製であるハブとプーリとの間に形成される環状空間に加硫ゴム部材が単純圧入・固定されて介在されてなるダンパプーリにおいて、
前記弾性体が、エチレンプロピレン系ゴムをベースとし、ステアリン酸を含有するゴム配合物の加硫物であって、
前記ゴム配合物が、ハロゲン基を導入したキノン誘導体を対金属粘着性付与剤として配合されてなることを特徴とするものである。
【0012】
当該構成において、キノン誘導体が、クロラニル(化合物名:2,3,5,6−テトラクロロキノン)であり、その上限配合量は、エチレンプロピレン系ゴム100重量部に対して0.7部とすることが望ましい。
【0013】
また、ステアリン酸の下限配合量は、エチレンプロピレン系ゴム100重量部に対して0.4部とすることが望ましい。
【0014】
【手段の詳細な説明】
本発明のダンパプーリ18は、前述の如く、ハブ12とプーリ14との間に形成される環状空間に加硫ゴム部材16が単純圧入・固定されてなるものである(図1参照)。
【0015】
ここで、ハブ12及びプーリ14は、通常、ともに金属製であるが、ハブ12は繊維強化プラスチック等で成形したものであってもよい。
【0016】
そして、加硫ゴム部材16は、非極性ゴムをベースとし、高級脂肪酸系の加工助剤を含有するゴム配合物で形成されている。
【0017】
ここで非極性ゴムとしては、エチレンプロピレン系ゴム(EOR)が前述の如く、耐熱性等の見地から望ましいが、スチレンブタジエンゴム(SBR)、イソプレンゴム(IR)、ブチルゴム(IIR)、天然ゴム(NR)等であってもよい。
【0018】
特に、EOR系ゴムの内、本発明者らが先に提案した下記要件(1) 〜(3) を満たすポリマーアロイをベースポリマー(原料ゴム)として使用することが望ましい。
【0019】
(1) ポリマーアロイは、エチレン・α−オレフィン・非共役ジエン共重合体ゴム:80〜60重量%と液状エチレン・α−オレフィン共重合体ゴム:20〜40重量%からなる。
【0020】
(2) エチレン・α−オレフィン・非共役ジエン共重合体ゴムは、エチレンと炭素原子数3〜20のα−オレフィンと非共役ジエンとからなり、かつ、エチレンとα−オレフィンとのモル比が60/40〜73/27であり、分子量分布指数(MW /Mn )が4未満であり、極限粘度[η]が2.7〜5.0dL/gであり、ヨウ素価が10〜40であり、非共役ジエンが5−エチリデン−2−ノルボルネンである。
【0021】
(3) 液状エチレン・α−オレフィン共重合体ゴムは、エチレンと炭素原子数3〜20のα−オレフィンとからなり、かつ、エチレンとα−オレフィンとのモル比が50/50〜78/22であり、極限粘度[η]が0.3〜0.5dL/gである。
【0022】
上記高級脂肪酸系の加工助剤としては、ステアリン酸、ラウリン酸及びそれらのエステル等を挙げることができる。
【0023】
そして、加硫系は過酸化物加硫系、硫黄加硫系を問わないが、耐圧縮永久歪み性に優れている過酸化物加硫系をベースとすることが望ましい。
【0024】
本発明では、ゴム配合物が、加硫時において非極性ゴム(ポリマー)と反応可能でかつ極性基を備えた対金属粘着性付与剤が配合されてなることを特徴とする。
【0025】
ここで、金属粘着性付与剤としては、極性基(特にハロゲン基:Cl,Br等)を導入したキノン誘導体や、同じく極性基(特にメルカプト基、アミノ基)を導入したトリアジン誘導体を挙げることができる。当該キノン誘導体としては、クロラニル(化合物名:2,3,5,6−テトラクロロキノン)、また、トリアジン誘導体としては、2,4,6−トリメルカプト−1,3,5−トリアジンが好適に使用できる。
【0026】
極性基としては、上記の他に、アミノ基(NH2 )、水酸基(OH)、カルボキシル基(CO2 H)、ハロゲン化メチル基(CH2 X)等でもよい。
【0027】
上記金属粘着性付与剤の配合量は、対金属粘着性付与の効果を奏する量以上で、前記弾性体の圧縮永久歪みを阻害しない範囲の量以下とする。例えば、クロラニルの場合、エチレンプロピレン系ゴム(以下「EOR」)100部に対して0.1〜0.7部、望ましくは、0.4〜0.6部、さらに望ましくは0.45〜0.55部とする(図2参照)。
【0028】
そして、上記加工助剤の配合量は、通常の配合量でもよいが、加工性(ゴムの混練加工)に問題が発生しない量以上で通常配合量以下とすることが、粘着性の見地から望ましい。具体的には、ステアリン酸の場合、EOR100部に対して0.4〜1部、望ましくは、0.45〜0.8部、さらに望ましくは0.5〜0.6部とする(図3参照)。
【0029】
本発明に係る加硫ゴム部材を形成するゴム配合物(未加硫の配合ゴム)には、非極性ゴム、高級脂肪酸系の加工助剤および対金属粘着性付与剤の他に、通常のゴム配合に使用されるカーボンブラック、軟化剤(脂肪酸系加工助剤を除く。)、亜鉛華、その他副資材を配合する。
【0030】
上記ゴム配合物は、例えば、有機過酸化物加硫系のEOR系の場合、例えば、下記のような方法により調製する。
【0031】
すなわち、バンバリーミキサー等のミキサー類を用いて、上記EORおよび軟化剤(プロセスオイル)、ステアリン酸を30〜170℃の温度で3〜10分間混練し、次いで、オーブンロール等のロール類を用いて、加硫剤(有機過酸化物又はイオウ)、カーボンブラック、上記対金属粘着付与剤(クロラニル)、必要に応じて加硫促進剤または加硫助剤、さらには、その他副資材を追加混合し、ロール温度40〜80℃で5〜30分間混練した後、混練物を押出し、リボン状またはシート状の配合ゴムを調製する。
【0032】
本発明に係るEOR系ゴム配合物から加硫ゴム部材を得るには、上記の未加硫配合ゴムを意図するゴム部材の形状に成形した後加硫を行う、又は加硫後意図するゴム部材の形状に裁断すればよい。
【0033】
すなわち、上記の未加硫配合ゴムは、押出成形機、カレンダーロール、またはプレスにより意図する形状に成形し、成形と同時にまたは成形物を加硫槽内に導入し、130〜270℃の温度で1〜30分間加熱し、加硫ゴムとする。このような加硫を行う際に、金型を用いてもよいし、また金型を用いなくてもよい。
【0034】
そして、上記加硫ゴムは、所定長、幅、厚みに調製(成形又は裁断により)して帯板状の加硫ゴム部材とし、通常、圧入液を塗布後、該加硫ゴム帯板(加硫ゴム部材)を、治具で固定したハブとプーリで形成される環状空間に圧入する。このときの圧縮率は、通常、30〜40%、望ましくは34〜36%である。
【0035】
【発明の効果】
本発明に係るダンパプーリは、その加硫ゴム部材を形成する、高級脂肪酸系の加工助剤を含有するゴム配合物が、加硫時において前記非極性ゴムと反応可能でかつ極性基を備えた対金属粘着性付与剤が配合されていることにより、高温雰囲気下でも、後述の試験例で示す如く、単純圧入・固定タイプのダンパプーリにおいて、ハブ及び/またはプーリと加硫ゴム部材との間の結合性(固着性)に問題が発生し難い。
【0036】
そして、このとき高級脂肪酸系の加工助剤の配合量を、混練加工性に問題が発生しない量以上で通常配合量以下することにより、ハブ及び/またはプーリと加硫ゴム部材との間の結合性(固着性)に問題がより発生し難くなる。
【0037】
【試験例】
以下、本発明の効果を確認するために行なった試験例について説明をする。
【0038】
A.各試験例に使用した基本配合処方は、下記の通りである。
【0039】
EOR配合処方
E0R(ポリマーアロイ) 147部
ステアリン酸 変量
亜鉛華 5部
カーボンブラック 80部
老化防止剤 2部
DCP(40%含有品) 8部
プロセスオイル 13部
クロラニル 変量
なお、使用したポリマーアロイは、下記仕様の高分子量成分(A成分)100部に対して、下記仕様の低分子量成分(B成分)47部を配合したものである。
【0040】
<A成分仕様>
エチレン/α−オレフィン:68/32、分子量分布指数(MW /Mn ):3.7、極限粘度[ηC ]:4.0dL/g、ヨウ素価:22
<B成分仕様>
エチレン/α−オレフィン:68/32、極限粘度[ηC ]:0.37dL/g、ヨウ素価:0
上記基本配合処方において、表1、図2(ステアリン酸:1部配合)及び 図3(クロラニル:0部)に、それぞれ示す各量のクロラニル及びステアリン酸を配合したゴム配合物をバンバリーミキサーで混練して未加硫ゴム配合物を調製した。
【0041】
当該未加硫ゴム配合物を用いてそれぞれ下記方法に従って試験を行なった。
【0042】
(1) 製品確認試験
帯板状の加硫ゴム部材(幅:19mm×長さ:325mm×厚み:5.4mmt)を、圧縮成形(加硫条件:170℃×10min )して調製した。該加硫ゴム部材を圧入液を塗布後、図1に示す断面形状のダンパプーリ(ハブ外径:100mmφ、プーリ内径:107mmφ、幅:30mm)に単純圧入・固定(圧縮率:35%)して、実施例・比較例の各ダンパプーリを調製した。
【0043】
そして、該各ダンパプーリについて、耐熱試験前及び耐熱試験後(加熱処理:120℃×240h)における滑り初め(すべりはじめ)のトルク(固着力)を測定した。
【0044】
結果を示す表1から、本発明の実施例であるクロラニル配合処方においては、クロラニル無配合の従来例に比して、耐熱試験前及び耐熱試験後の双方において固着力が良好で、固着力の低下率も低いことが分かる。
【0045】
(2) 圧縮永久歪み
JIS K 6301に準拠して耐熱試験後(120℃×70h)の圧縮永久歪みを測定した。
【0046】
結果を示す図2からクロラニルの配合量の増大に対応して、固着力が増大、クロラニルが0.7部前後から圧縮永久歪みも悪くなることが分かる。
【0047】
(3) 固着力・表面析出量
プレス加硫成形(170℃×10min )して円柱体(16mmφ×10mmH)を調製し、該円柱体を25mm□×3.2mmtの鉄板で挟着し35%圧縮状態で、加熱処理後(120℃×10日)に、圧縮永久歪みを測定するとともに、一方の鉄板を固定し、他方の鉄板を引張って鉄板が加硫ゴム体から離れるときの強さを固着力とした。
【0048】
なお、表面析出量は、フーリエ変換赤外分光法(FT−IR)により測定した。
【0049】
結果を示す図3から、ステアリン酸の配合量の増大に対応して、表面析出量が増大するとともに、固着力が低下することが分かる。即ち、固着力の見地からは、ステアリン酸の配合量は少ない方、即ち1部未満が望ましい。
【0050】
【表1】

Figure 0003806796
【0051】
【図面の簡単な説明】
【図1】 本発明を適用するダンパプーリの一例を示す判断面図
【図2】 クロラニル添加量(配合量)と固着力及び圧縮永久歪みとの関係を示すグラフ図
【図3】 ステアリン酸添加量(配合量)と表面析出量及び固着力との関係を示すグラフ図
【符号の説明】
12 ハブ
14 プーリ
16 加硫ゴム部材
18 ダンパプーリ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a damper pulley manufacturing method in which a vulcanized rubber member is simply press-fitted and fixed in an annular space formed between a hub and a pulley.
[0002]
In the following description, the blending unit is a weight unit unless otherwise specified.
[0003]
[Prior art]
As shown in FIG. 1, the vulcanized rubber member 16 simply press-fitted and fixed in the annular space formed between the hub 12 and the pulley 14 in the damper pulley 18 has conventionally been NR / SBR, SBR, chlorinated IIR, It was made of a rubber material such as NBR or hydrogenated NBR (Japanese Patent Laid-Open No. 62-297557).
[0004]
[Problems to be solved by the invention]
However, vulcanized rubber members formed from these rubber materials are difficult to meet the recent demand for improved heat resistance accompanying the temperature rise in the engine room.
[0005]
Therefore, it is conceivable to use an ethylene propylene rubber material having excellent heat resistance, that is, an ethylene / α-olefin copolymer rubber material, as the material of the vulcanized rubber member.
[0006]
The hub and pulley of the damper are usually made of metal (made of metal such as cast iron and aluminum), and in the vulcanized rubber member 16 formed of a nonpolar rubber material such as ethylene propylene rubber (EOR) material, It was found that it was difficult to obtain a sufficient fixing force (pulley slip initial torque) when press-fitting at a predetermined compression rate (particularly after heat aging).
[0007]
In view of the above, the present invention is a simple press-fit / fixed type damper pulley, even in a high-temperature atmosphere, and the damper pulley is less likely to cause a problem in the connectivity (adhesiveness) between the hub and / or pulley and the vulcanized rubber member Is to provide a method for manufacturing a damper pulley .
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have made extensive efforts to develop a rubber compound, which can react with a nonpolar rubber at the time of vulcanization, and has adhesion to metal having a polar group. The present inventors have found that an agent may be added, and have come up with a method for manufacturing a damper pulley having the following configuration.
[0009]
In a method of manufacturing a damper pulley in which a vulcanized rubber member is simply press-fitted and fixed in an annular space between a hub and a pulley at least on the pulley side,
The vulcanized rubber member is a vulcanized rubber compound containing non-polar rubber as a base and containing a higher fatty acid processing aid,
The rubber compound is characterized in that it is reacted with the non-polar rubber at the time of vulcanization and is compounded with a metal tackifier having a polar group.
[0010]
In the above configuration, the blending amount of the processing aid is not less than an amount that does not cause a problem in workability and is usually not more than the blending amount, and the blending amount of the metal tackifier imparts the effect of imparting metal tackiness. It is desirable that the amount is not less than the amount to be played and not more than the amount not inhibiting the compression set of the elastic body.
[0011]
Another aspect of the present invention is a damper pulley in which a vulcanized rubber member is simply press-fitted and fixed in an annular space formed between a hub and a pulley at least on the pulley side made of metal.
The elastic body is a vulcanizate of a rubber compound based on ethylene propylene rubber and containing stearic acid,
The rubber compound is characterized in that a quinone derivative having a halogen group introduced therein is compounded as a metal tackifier.
[0012]
In this configuration, the quinone derivative is chloranil (compound name: 2,3,5,6-tetrachloroquinone), and the upper limit compounding amount is 0.7 part with respect to 100 parts by weight of the ethylene propylene rubber. It is desirable.
[0013]
Moreover, it is desirable that the lower limit compounding amount of stearic acid is 0.4 part with respect to 100 parts by weight of ethylene propylene rubber.
[0014]
[Detailed description of the means]
As described above, the damper pulley 18 of the present invention is obtained by simply press-fitting and fixing the vulcanized rubber member 16 in an annular space formed between the hub 12 and the pulley 14 (see FIG. 1).
[0015]
Here, the hub 12 and the pulley 14 are usually made of metal, but the hub 12 may be formed of fiber reinforced plastic or the like.
[0016]
The vulcanized rubber member 16 is made of a non-polar rubber and a rubber compound containing a higher fatty acid processing aid.
[0017]
As the nonpolar rubber, ethylene propylene rubber (EOR) is desirable from the viewpoint of heat resistance as described above, but styrene butadiene rubber (SBR), isoprene rubber (IR), butyl rubber (IIR), natural rubber ( NR) or the like.
[0018]
In particular, among EOR rubbers, it is desirable to use, as a base polymer (raw rubber), a polymer alloy that satisfies the following requirements (1) to (3) previously proposed by the present inventors.
[0019]
(1) polymer alloy, the ethylene-alpha-olefin-non-conjugated diene copolymer rubber, 80 to 60 wt% and a liquid ethylene-alpha-olefin copolymer rubber: made of 20 to 40 wt%.
[0020]
(2) The ethylene / α-olefin / non-conjugated diene copolymer rubber is composed of ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated diene, and has a molar ratio of ethylene and α-olefin. 60/40 to 73/27, the molecular weight distribution index (M W / M n ) is less than 4, the intrinsic viscosity [η] is 2.7 to 5.0 dL / g, and the iodine value is 10 to 40 And the non-conjugated diene is 5-ethylidene-2-norbornene.
[0021]
(3) The liquid ethylene / α-olefin copolymer rubber is composed of ethylene and an α-olefin having 3 to 20 carbon atoms, and the molar ratio of ethylene to α-olefin is 50/50 to 78/22. And the intrinsic viscosity [η] is 0.3 to 0.5 dL / g.
[0022]
Examples of the higher fatty acid processing aids include stearic acid, lauric acid and esters thereof.
[0023]
The vulcanization system may be a peroxide vulcanization system or a sulfur vulcanization system, but it is desirable to use a peroxide vulcanization system having excellent compression set resistance.
[0024]
The present invention is characterized in that the rubber compound is compounded with a metal-tackifying agent capable of reacting with a nonpolar rubber (polymer) at the time of vulcanization and having a polar group.
[0025]
Here, examples of the metal tackifier include a quinone derivative having a polar group (particularly a halogen group: Cl, Br, etc.) and a triazine derivative having a polar group (particularly a mercapto group, amino group) introduced therein. Can do. As the quinone derivative, chloranil (compound name: 2,3,5,6-tetrachloroquinone) is preferable, and as the triazine derivative, 2,4,6-trimercapto-1,3,5-triazine is preferable. Can be used.
[0026]
In addition to the above, the polar group may be an amino group (NH 2 ), a hydroxyl group (OH), a carboxyl group (CO 2 H), a halogenated methyl group (CH 2 X), or the like.
[0027]
The amount of the to-metal tackifier above quantities with the effects to metal tackifying, or less amount in the range that does not inhibit the compression set of the elastic body. For example, in the case of chloranil, 0.1 to 0.7 part, desirably 0.4 to 0.6 part, more desirably 0.45 to 0, with respect to 100 parts of ethylene propylene rubber (hereinafter referred to as “EOR”). .55 parts (see FIG. 2).
[0028]
The blending amount of the processing aid may be a normal blending amount, but it is desirable from the viewpoint of tackiness to be not less than an amount causing no problem in workability (rubber kneading process) and not more than the usual blending amount. . Specifically, in the case of stearic acid, 0.4 to 1 part, preferably 0.45 to 0.8 part, and more preferably 0.5 to 0.6 part with respect to 100 parts of EOR (FIG. 3). reference).
[0029]
The rubber compound (unvulcanized compounded rubber) forming the vulcanized rubber member according to the present invention includes a normal rubber in addition to a nonpolar rubber, a higher fatty acid processing aid and a metal tackifier. Carbon black, softener (excluding fatty acid processing aids), zinc white, and other auxiliary materials used for blending are blended.
[0030]
For example, in the case of an organic peroxide vulcanization type EOR system, the rubber compound is prepared by the following method, for example.
[0031]
That is, using mixers such as a Banbury mixer, the EOR, softener (process oil), and stearic acid are kneaded at a temperature of 30 to 170 ° C. for 3 to 10 minutes, and then using rolls such as an oven roll. , Vulcanizing agent (organic peroxide or sulfur), carbon black, the above-mentioned metal tackifier (chloranil), vulcanization accelerator or vulcanization aid, and other auxiliary materials as necessary After kneading at a roll temperature of 40 to 80 ° C. for 5 to 30 minutes, the kneaded product is extruded to prepare a ribbon-like or sheet-like compounded rubber.
[0032]
In order to obtain a vulcanized rubber member from the EOR rubber compound according to the present invention, the unvulcanized compounded rubber is molded into the shape of the intended rubber member and then vulcanized, or the rubber member intended after vulcanization. What is necessary is just to cut into the shape of.
[0033]
That is, the above-mentioned unvulcanized compounded rubber is molded into an intended shape by an extruder, a calender roll, or a press, and the molded product is introduced into the vulcanizing tank simultaneously with molding or at a temperature of 130 to 270 ° C. Heat for 1 to 30 minutes to obtain vulcanized rubber. When performing such vulcanization, a mold may be used or a mold may not be used.
[0034]
The vulcanized rubber is adjusted to a predetermined length, width, and thickness (by molding or cutting) to form a strip-like vulcanized rubber member. Usually, after applying the press-fit liquid, the vulcanized rubber strip (vulcanized) A vulcanized rubber member) is press-fitted into an annular space formed by a hub and a pulley fixed with a jig. The compression rate at this time is usually 30 to 40%, desirably 34 to 36%.
[0035]
【The invention's effect】
In the damper pulley according to the present invention, a rubber compound containing a higher fatty acid type processing aid forming the vulcanized rubber member is capable of reacting with the nonpolar rubber during vulcanization and having a polar group. By including a metal tackifier, the coupling between the hub and / or pulley and the vulcanized rubber member in a simple press-fit / fixed type damper pulley, as shown in the test examples described later, even in a high-temperature atmosphere. It is difficult to cause a problem in the property (adhesiveness).
[0036]
At this time, the amount of the higher fatty acid-based processing aid is not less than the amount that does not cause a problem in kneadability and not more than the normal amount, so that the coupling between the hub and / or pulley and the vulcanized rubber member is achieved. Problems (stickiness) are less likely to occur.
[0037]
[Test example]
Hereinafter, test examples conducted for confirming the effects of the present invention will be described.
[0038]
A. The basic formulation used in each test example is as follows.
[0039]
EOR formulation E0R (polymer alloy) 147 parts stearic acid variable zinc white 5 parts carbon black 80 parts anti-aging agent 2 parts DCP (40% containing product) 8 parts process oil 13 parts chloranil variable The polymer alloy used is as follows 47 parts of low molecular weight component (B component) having the following specifications are blended with 100 parts of high molecular weight component (A component) having the specifications.
[0040]
<A component specification>
Ethylene / α-olefin: 68/32, molecular weight distribution index (M W / M n ): 3.7, intrinsic viscosity [η C ]: 4.0 dL / g, iodine value: 22
<B component specifications>
Ethylene / α-olefin: 68/32, intrinsic viscosity [η C ]: 0.37 dL / g, iodine value: 0
In the above basic compounding prescription, rubber compounds containing each amount of chloranil and stearic acid shown in Table 1, FIG. 2 (1 part of stearic acid) and FIG. 3 (chloranil: 0 part) are kneaded with a Banbury mixer. Thus, an unvulcanized rubber compound was prepared.
[0041]
Each of the unvulcanized rubber compounds was tested according to the following method.
[0042]
(1) Product confirmation test A strip-like vulcanized rubber member (width: 19 mm x length: 325 mm x thickness: 5.4 mmt) was prepared by compression molding (vulcanization conditions: 170 ° C x 10 min). After the vulcanized rubber member is coated with a press-fitting liquid, it is simply press-fitted and fixed (compression ratio: 35%) to a damper pulley (hub outer diameter: 100 mmφ, pulley inner diameter: 107 mmφ, width: 30 mm) shown in FIG. The damper pulleys of Examples and Comparative Examples were prepared.
[0043]
And about this damper pulley, the torque (adhesion force) of the slip start (slip start) before a heat test and after a heat test (heat processing: 120 degreeC x 240 h) was measured.
[0044]
From Table 1 showing the results, in the chloranil compounding prescription that is an example of the present invention, the adhesion strength is good both before and after the heat test, compared to the conventional example without chloranil, and the adhesion strength It can be seen that the rate of decline is also low.
[0045]
(2) Compression set
According to JIS K 6301, compression set after heat resistance test (120 ° C. × 70 h) was measured.
[0046]
From the results shown in FIG. 2, it can be seen that the sticking force increases and the compression set also deteriorates from around 0.7 parts of chloranil corresponding to the increase in the amount of chloranil.
[0047]
(3) Adhesive strength / Surface precipitation amount Press vulcanization molding (170 ° C. × 10 min) to prepare a cylindrical body (16 mmφ × 10 mmH), and the cylindrical body is sandwiched between 25 mm □ × 3.2 mmt iron plates to 35% In the compressed state, after heat treatment (120 ° C. × 10 days), the compression set is measured, and one iron plate is fixed and the other iron plate is pulled and the strength when the iron plate leaves the vulcanized rubber body is measured. The fixing force was used.
[0048]
The amount of surface precipitation was measured by Fourier transform infrared spectroscopy (FT-IR).
[0049]
From FIG. 3 showing the results, it can be seen that the amount of surface precipitation increases and the fixing force decreases in accordance with the increase in the amount of stearic acid. That is, from the standpoint of sticking strength, it is desirable that the amount of stearic acid is smaller, that is, less than 1 part.
[0050]
[Table 1]
Figure 0003806796
[0051]
[Brief description of the drawings]
[1] The present invention determines sectional view showing an example of a damper pulley to apply [2] chloranil amount (amount) and the fixing force and graph 3 shows stearate amount showing the relationship between compression set Graph showing the relationship between (mixing amount), surface precipitation amount, and adhesion force [Explanation of symbols]
12 Hub 14 Pulley 16 Vulcanized rubber member 18 Damper pulley

Claims (3)

少なくともプーリ側が金属製であるハブとプーリとの間に形成される環状空間に加硫ゴム部材を単純圧入・固定してダンパプーリを製造する方法において、
前記加硫ゴム部材を、エチレンプロピレン系ゴムをベースとし、高級脂肪酸系の加工助剤を含有するとともに、対金属粘着性付与剤としてクロラニル(化合物名:2,3,5,6−テトラクロロキノン)を含有するゴム配合物で形成するとともに、
前記エチレンプロピレン系ゴムを、
(1) エチレン・α−オレフィン・非共役ジエン共重合体ゴム:80〜60重量%と液状エチレン・α−オレフィン共重合体ゴム:20〜40重量%からなるポリマーアロイであり、
(2) 前記エチレン・α−オレフィン・非共役ジエン共重合体ゴムは、エチレンと炭素原子数3〜20のα−オレフィンと非共役ジエンとからなり、かつ、エチレンとα−オレフィンとのモル比が60/40〜73/27であり、分子量分布指数(M W /M n )が4未満であり、極限粘度[η]が2.7〜5.0dL/gであり、ヨウ素価が10〜40であり、非共役ジエンが5−エチリデン−2−ノルボルネンであり、さらに、
(3) 液状エチレン・α−オレフィン共重合体ゴムは、エチレンと炭素原子数3〜20のα−オレフィンとからなり、かつ、エチレンとα−オレフィンとのモル比が50/50〜78/22であり、極限粘度[η]が0.3〜0.5dL/gである、
ものとすることを特徴とする請求項1記載のダンパプーリの製造方法。
In a method of manufacturing a damper pulley by simply press-fitting and fixing a vulcanized rubber member in an annular space formed between a hub and a pulley at least on the pulley side made of metal ,
The vulcanized rubber member is based on ethylene propylene rubber, contains a higher fatty acid processing aid, and chloranil (compound name: 2,3,5,6-tetrachloroquinone as a metal tackifier). And a rubber compound containing
The ethylene propylene rubber,
(1) Ethylene / α-olefin / non-conjugated diene copolymer rubber: 80-60% by weight and liquid ethylene / α-olefin copolymer rubber: 20-40% by weight polymer alloy,
(2) The ethylene / α-olefin / non-conjugated diene copolymer rubber is composed of ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated diene, and a molar ratio of ethylene and α-olefin. Is 60/40 to 73/27, and the molecular weight distribution index (M W / M n ) Is less than 4, the intrinsic viscosity [η] is 2.7 to 5.0 dL / g, the iodine value is 10 to 40, the non-conjugated diene is 5-ethylidene-2-norbornene,
(3) The liquid ethylene / α-olefin copolymer rubber is composed of ethylene and an α-olefin having 3 to 20 carbon atoms, and the molar ratio of ethylene to α-olefin is 50/50 to 78/22. And the intrinsic viscosity [η] is 0.3 to 0.5 dL / g.
The method of manufacturing a damper pulley according to claim 1, wherein
前記エチレンプロピレン系ゴム100重量部に対する前記クロラニルの配合量を0.1〜0.7重量部とするとともに、前記加工助剤をステアリン酸とし、該ステアリン酸の配合量を0.4〜1重量部とすることを特徴とする請求項1記載のダンパプーリの製造方法。  The blending amount of the chloranil with respect to 100 parts by weight of the ethylene propylene rubber is 0.1 to 0.7 parts by weight, the processing aid is stearic acid, and the blending amount of the stearic acid is 0.4 to 1 weight. The damper pulley manufacturing method according to claim 1, wherein the damper pulley is a part. 前記ゴム配合物を有機過酸化物加硫系とすることを特徴とする請求項1又は2記載のダンパプーリの製造方法。3. The method for producing a damper pulley according to claim 1, wherein the rubber compound is an organic peroxide vulcanization system.
JP24085499A 1999-08-27 1999-08-27 Damper pulley manufacturing method Expired - Fee Related JP3806796B2 (en)

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