JP3134239B2 - Friction material - Google Patents
Friction materialInfo
- Publication number
- JP3134239B2 JP3134239B2 JP04173533A JP17353392A JP3134239B2 JP 3134239 B2 JP3134239 B2 JP 3134239B2 JP 04173533 A JP04173533 A JP 04173533A JP 17353392 A JP17353392 A JP 17353392A JP 3134239 B2 JP3134239 B2 JP 3134239B2
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- JP
- Japan
- Prior art keywords
- graphite
- weight
- friction
- inorganic powder
- friction material
- 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.)
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車、産業用車両な
どのブレーキ、クラッチフェーシングに使用される摩擦
材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material used for brakes and clutch facings of automobiles, industrial vehicles and the like.
【０００２】[0002]
【従来の技術】従来、車両用のブレーキパッド等に使用
される摩擦材としては、摩擦係数が高くて制動力が大き
いこと、摩擦係数が安定していて制動力が安定している
こと、耐摩耗性が良好であること、相手攻撃性が小さい
こと、水や油等に侵されず材料強度が大きいことなどの
特性が求められている。2. Description of the Related Art Conventionally, friction materials used for brake pads and the like for vehicles have a high friction coefficient and a large braking force, a stable friction coefficient and a stable braking force, Characteristics such as good abrasion, low aggressiveness to the opponent, and high material strength without being affected by water or oil are required.
【０００３】上記特性を比較的満足させる摩擦材とし
て、繊維基材、結合剤、固体潤滑剤や有機物、無機物の
添加剤とから構成されたものが一般的に使用されてい
る。そして、これらの摩擦材には、潤滑性に優れ、耐摩
耗性を向上させる摩擦調整剤としてのグラファイトが広
く用いられている。[0003] As a friction material which relatively satisfies the above-mentioned characteristics, a material composed of a fiber base material, a binder, a solid lubricant, and an organic or inorganic additive is generally used. For these friction materials, graphite is widely used as a friction modifier which is excellent in lubricity and improves wear resistance.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記摩擦調整
剤としてのグラファイトは、相手材としてのロータ表面
に移着しやすい性質がある。このため、グラファイトを
含有した摩擦材は、特に軽負荷制動が繰り返し行われる
と、グラファイトの被膜がロータ表面に形成されて、摩
擦係数が低下するという欠点がある。However, graphite as the above-mentioned friction modifier has a property of being easily transferred to a rotor surface as a mating material. For this reason, the friction material containing graphite has a drawback that a graphite coating is formed on the rotor surface, especially when light load braking is repeatedly performed, and the friction coefficient is reduced.
【０００５】これを解消する手段としては、硬度の高い
無機物粉末等のアブレッシブ剤を添加してグラファイト
被膜を取り除く手段が考えられる。しかし、この手段で
グラファイト被膜を確実に取り除くためには、多量のア
ブレッシブ剤を添加する必要があり、この場合相手攻撃
性が高まり相手材としてのロータを著しく摩耗させると
いう弊害がある。また、アブレッシブ剤としての無機物
粉末が摩擦材の表面から脱落して、摩擦材自身を摩耗さ
せるという弊害もある。As a means for solving this problem, a means for removing the graphite coating by adding an abrasive agent such as an inorganic powder having high hardness can be considered. However, in order to surely remove the graphite film by this means, it is necessary to add a large amount of an abrasive agent, and in this case, there is a problem that the opponent aggressiveness is increased and the rotor as the opponent material is significantly worn. In addition, there is also a problem that the inorganic powder as an abrasive agent falls off the surface of the friction material and wears the friction material itself.
【０００６】本発明は上記実情に鑑みてなされたもので
あり、グラファイトの添加により耐摩耗性の向上を図り
つつ、摩擦係数を低下させるというグラファイトの欠点
を解消して、耐摩耗性に優れかつ摩擦係数の安定した摩
擦材を提供することを目的とする。[0006] The present invention has been made in view of the above-mentioned circumstances, and while improving the wear resistance by adding graphite, eliminates the drawback of graphite that lowers the coefficient of friction, and provides excellent wear resistance. An object is to provide a friction material having a stable friction coefficient.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決する本発
明の摩擦材は、中心粒径１〜１５μｍ、モース硬度６以
上で、相手材表面に移着したグラファイト被膜を取り除
くアブレッシブ剤として機能しうる無機物粉末と、該無
機物粉末の表面に被着されたグラファイトとを有する粒
状減摩材が３〜２０重量％含有されていることを特徴と
する。粒状減摩材は、ピッチ、タール又はフェノール樹
脂をバインダとして、無機物粉末とグラファイト粉末と
を均一に混合し、３００〜３５０℃程度で焼成して固化
させた後、粉砕して得ることができる。粒状減摩材の粒
径は、無機物粉末の表面にグラファイトが被着している
状態が維持される程度の粗さとすることができ、５０〜
３００μｍ程度とすることが好ましい。According to the present invention, there is provided a friction material having a center particle size of 1 to 15 μm, a Mohs hardness of 6 or more , and removal of a graphite film transferred to a mating material surface.
The present invention is characterized in that 3 to 20% by weight of a granular lubricating material having an inorganic powder capable of functioning as an abrasive agent and graphite adhered to the surface of the inorganic powder is contained. The granular lubricating material can be obtained by uniformly mixing an inorganic powder and a graphite powder with a pitch, tar or phenol resin as a binder, firing at about 300 to 350 ° C. to solidify, and then pulverizing. The particle size of the particulate lubricating material can be set to such a level that the state in which graphite is adhered to the surface of the inorganic powder is maintained.
The thickness is preferably about 300 μm.
【０００８】なお、上記無機物粉末と上記グラファイト
粉末との混合割合は、無機物粉末及びグラファイト粉末
全体に対して、無機物粉末を５〜２０重量％とすること
が好ましい。無機物粉末の混合割合が５重量％より少な
いと、アブレッシブ作用が少なく、ロータ表面に形成し
たグラファイト被膜を除去できず、摩擦係数が低下す
る。また、無機物粉末の混合割合が２０重量％より多い
と、相手攻撃性が高まり、ロータ表面を著しく摩耗させ
る。The mixing ratio of the inorganic powder and the graphite powder is preferably 5 to 20% by weight based on the total amount of the inorganic powder and the graphite powder. If the mixing ratio of the inorganic powder is less than 5% by weight, the abrasive effect is small, the graphite coating formed on the rotor surface cannot be removed, and the friction coefficient decreases. On the other hand, if the mixing ratio of the inorganic powder is more than 20% by weight, the aggressiveness of the partner increases, and the rotor surface is significantly worn.
【０００９】粒状減摩材を構成する無機物粉末として
は、中心粒径１〜１５μｍ、モース硬度６以上のものが
用いられる。なお、中心粒径とは、所定の数の無機物粉
末中に、最も多く存在する粉末の粒径をいう。この無機
物粉末は、後述するように相手材表面に移着したグラフ
ァイト被膜を削除する働きを有する。このため、無機物
粉末の中心粒径が１μｍより小さいと、相手材表面に移
着したグラファイト被膜を削除するという効果を十分に
発揮できない。また無機物粉末の中心粒径が１５μｍよ
り大きいと、相手攻撃性が高まり、相手材が著しく摩耗
するという弊害がある。これらの点より、無機物粉末の
中心粒径は１〜１５μｍとする。 As the inorganic powder constituting the particulate lubricant, a powder having a center particle diameter of 1 to 15 μm and a Mohs hardness of 6 or more is used. In addition, the center particle size refers to the particle size of the powder that is most frequently present in a predetermined number of inorganic powders. This inorganic powder has a function of removing the graphite film transferred to the surface of the counterpart material as described later. For this reason, if the center particle diameter of the inorganic powder is smaller than 1 μm, the effect of removing the graphite film transferred to the surface of the counterpart material cannot be sufficiently exhibited. If the center particle diameter of the inorganic powder is larger than 15 μm, the aggressiveness of the mating member is increased and the mating material is significantly worn. From these points, the mean particle diameter of the inorganic powder shall be the 1 to 15 m.
【００１０】また、無機物粉末の硬さについても、モー
ス硬度が６未満のものでは相手材表面に移着したグラフ
ァイト被膜を削除するという効果を十分に発揮できな
い。なお、モース硬度の上限は、無機物粉末の粒径にも
関与されるが、相手攻撃性を考慮して９以下とすること
が好ましい。モース硬度６以上の無機物粉末としては、
アルミナ（Ａｌ2 Ｏ3 、モース硬度９）、チタニア（Ｔ
ｉＯ2 、モース硬度６）、シリカ（ＳｉＯ2 、モース硬
度７）、炭化珪素（ＳｉＣ、モース硬度９）等を挙げる
ことができる。[0010] Regarding the hardness of the inorganic powder, if the Mohs hardness is less than 6, the effect of removing the graphite coating transferred to the surface of the mating material cannot be sufficiently exhibited. The upper limit of the Mohs hardness depends on the particle size of the inorganic powder, but is preferably 9 or less in consideration of the opponent's aggression. As an inorganic powder having a Mohs hardness of 6 or more,
Alumina (Al 2 O 3 , Mohs hardness 9), Titania (T
iO 2 , Mohs hardness 6), silica (SiO 2 , Mohs hardness 7), silicon carbide (SiC, Mohs hardness 9) and the like.
【００１１】粒状減摩材を構成するグラファイトとして
は、特に限定されず、天然の鱗状黒鉛、土状黒鉛や、人
造グラファイトとすることができる。本発明の摩擦材
は、繊維基材に結合剤と上記粒状減摩材や他の添加剤と
が混合され、成形されて形成されている。そして各種の
添加剤が繊維基材中に分散保持され結合剤で硬化されて
一体化した成形体として構成されている。The graphite constituting the particulate lubricating material is not particularly limited, and may be natural scale graphite, earth graphite, or artificial graphite. The friction material of the present invention is formed by mixing a fiber base material with a binder, the above-described particulate lubricant and other additives, and molding the mixture. Then, various additives are dispersed and held in the fiber base material, cured with a binder, and configured as an integrated molded body.
【００１２】繊維基材としては、アラミド繊維、ナイロ
ン繊維、レーヨン繊維、フェノール繊維などの有機繊維
や、ガラス繊維、シリカ繊維、アルミナ繊維、チタン酸
カリウム繊維、ロックウールなどの無機繊維や、銅繊
維、スチール繊維などの金属繊維を用いることができ
る。これらの繊維は、１種又は２種以上用いることがで
きる。Examples of the fiber base material include organic fibers such as aramid fiber, nylon fiber, rayon fiber and phenol fiber; inorganic fibers such as glass fiber, silica fiber, alumina fiber, potassium titanate fiber and rock wool; and copper fiber. And metal fibers such as steel fibers. One or more of these fibers can be used.
【００１３】結合剤としては、フェノール樹脂、メラミ
ン樹脂、エポキシ樹脂等の熱硬化性樹脂を用いることが
できる。これらの熱硬化性樹脂は、１種又は２種以上を
用いることができる。添加剤としては、カシューダス
ト、二硫化モリブデン、硫酸バリウム、銅粉、消石灰、
ラバーダスト、珪藻土、ドロマイト、炭酸カルシウム、
炭酸マグネシウム、酸化マグネシウム、酸化ジルコニウ
ム、ケイ酸カルシウム等を用いることができる。As the binder, a thermosetting resin such as a phenol resin, a melamine resin, and an epoxy resin can be used. One or two or more of these thermosetting resins can be used. Additives include cashew dust, molybdenum disulfide, barium sulfate, copper powder, slaked lime,
Rubber dust, diatomaceous earth, dolomite, calcium carbonate,
Magnesium carbonate, magnesium oxide, zirconium oxide, calcium silicate and the like can be used.
【００１４】本発明の摩擦材は、上記の繊維基材、結合
剤、粒状減摩材やその他の添加剤の所定量の混合物を、
バンバリーミキサー、ヘンシェルミキサー、ニーダある
いはＶ型ブレンダーなどで充分均一に混合し、この混合
物を型内に充填、押圧して予備成形を行い、予備成形体
を加熱加圧して結合剤を硬化させた後、熱処理する通常
の方法で成形して形成することができる。The friction material of the present invention comprises a mixture of a predetermined amount of the above-mentioned fiber base material, a binder, a particulate lubricant, and other additives.
After mixing sufficiently uniformly with a Banbury mixer, Henschel mixer, kneader or V-type blender, the mixture is filled in a mold, pressed to perform preforming, and the preformed body is heated and pressed to cure the binder. , And can be formed by a usual method of heat treatment.
【００１５】[0015]
【発明の作用及び効果】本発明の摩擦材は、特定の粒径
及び硬度をもつ無機物粉末の周囲にグラファイトが被着
されてなる粒状減摩材が特定量含有されている。この粒
状減摩材を構成するグラファイトは、潤滑性が良好なの
で、摩擦材の耐摩耗性の向上に貢献する。一方で、グラ
ファイトは相手材表面に移着してグラファイト被膜を形
成しやすい。しかし、アブレッシブ剤としての特定の粒
径及び硬度をもつ無機物粉末がグラファイトに近接して
存在するため、生成したグラファイト被膜を即座にかつ
確実に除去することができる。このため、グラファイト
被膜に起因して摩擦材の摩擦係数が低下することを、無
機物粉末の働きにより効果的に抑えることが可能とな
る。The friction material according to the present invention contains a specific amount of a particulate lubricating material obtained by coating graphite around an inorganic powder having a specific particle size and hardness. The graphite constituting the granular lubricating material has good lubricity, and thus contributes to the improvement of the wear resistance of the friction material. On the other hand, graphite is easily transferred to the surface of a counterpart material to form a graphite coating. However, since an inorganic powder having a specific particle size and hardness as an abrasive agent exists close to graphite, the generated graphite coating can be immediately and reliably removed. For this reason, it is possible to effectively suppress the decrease in the friction coefficient of the friction material due to the graphite coating by the action of the inorganic powder.
【００１６】また、グラファイトにより被覆された無機
物粉末は、摩擦材表面から脱落しにくくなり、摩擦材表
面から脱落した無機物粉末による摩擦材自身の摩耗も効
果的に抑えることができる。したがって、本発明によれ
ば、グラファイトの添加により耐摩耗性の向上を図りつ
つ、摩擦係数を低下させるというグラファイトの欠点を
解消することが可能となり、本発明の摩擦材は、耐摩耗
性に優れ、かつ摩擦係数の安定性に優れたものとなる。Further, the inorganic powder coated with graphite is less likely to fall off the surface of the friction material, and the wear of the friction material itself due to the inorganic powder falling off the surface of the friction material can be effectively suppressed. Therefore, according to the present invention, it is possible to improve the wear resistance by adding graphite, and to eliminate the disadvantage of graphite that lowers the friction coefficient, and the friction material of the present invention has excellent wear resistance. And excellent stability of the coefficient of friction.
【００１７】[0017]
【実施例】以下、実施例により具体的に説明する。本実
施例はブレーキパッドに本発明を適用したものである。 （実施例１）表１にも示すように、グラファイト粉末９
０重量％、及び無機物粉末として中心粒径２μｍ、モー
ス硬度９のアルミナ粉末１０重量％の混合粉末全体に対
して、バインダとしてのピッチを１５重量％加えて均一
に混合し、３００℃で３０分間焼成して固化させた後、
中心粒径約２００μｍに粉砕して粒状減摩材（Ａ）を得
た。The present invention will be specifically described below with reference to examples. In this embodiment, the present invention is applied to a brake pad. (Example 1) As shown in Table 1, graphite powder 9
0% by weight, and 15% by weight of a pitch as a binder were added to the entire mixed powder of 10% by weight of alumina powder having an average particle size of 2 μm and Mohs hardness of 9 as an inorganic powder, and the mixture was mixed uniformly at 300 ° C. for 30 minutes. After firing and solidifying,
It was pulverized to a center particle size of about 200 μm to obtain a particulate anti-friction material (A).
【００１８】[0018]
【表１】 そして、表２にも示すようにこの粒状減摩材（Ａ）３重
量％、アラミド繊維１０重量％、スチール繊維５重量
％、チタン酸カリウム繊維８重量％、銅繊維３重量％、
結合剤としてフェノール樹脂１０重量％、カシューダス
ト８重量％、二硫化モリブデン３重量％、及び硫酸バリ
ウム５０重量％の組成の混合物をＶ型ブレンダーで均一
に混合した。[Table 1] Then, as shown in Table 2, 3% by weight of the granular antifriction material (A), 10% by weight of aramid fiber, 5% by weight of steel fiber, 8% by weight of potassium titanate fiber, 3% by weight of copper fiber,
A mixture having a composition of 10% by weight of phenol resin, 8% by weight of cashew dust, 3% by weight of molybdenum disulfide, and 50% by weight of barium sulfate was uniformly mixed with a V-type blender as a binder.
【００１９】この混合物を加圧して予備成形した後、金
型中で１６０℃で４００ｋｇ／ｃｍ 2 の圧力で１０分間
熱成形し、２５０℃で１２０分の熱処理をおこなって摩
擦材とした。 （実施例２）無機物粉末として中心粒径１２μｍ、モー
ス硬度９のアルミナ粉末を用いること以外は上記実施例
１と同様にして粒状減摩材（Ｂ）を得た。After pre-forming the mixture by pressing,
400 kg / cm at 160 ° C in a mold Two10 minutes at pressure
Thermoforming and heat treatment at 250 ° C for 120 minutes
It was a friction material. Example 2 As an inorganic powder, a center particle diameter of 12 μm,
Example 1 except that alumina powder having a hardness of 9 was used.
In the same manner as in Example 1, a granular lubricating material (B) was obtained.
【００２０】そして、上記粒状減摩材（Ａ）の代わりに
この粒状減摩材（Ｂ）を用いるとともに粒状減摩材
（Ｂ）の添加量を２０重量％とし、かつ硫酸バリウムの
添加量を３３重量％とすること以外は、上記実施例１と
同様にして摩擦材を得た。 （実施例３）無機物粉末として中心粒径１０μｍ、モー
ス硬度６のチタニア粉末を用いること以外は上記実施例
１と同様にして粒状減摩材（Ｃ）を得た。The granular lubricant (B) is used in place of the granular lubricant (A), the amount of the particulate lubricant (B) is set to 20% by weight, and the amount of the barium sulfate is reduced to 20% by weight. A friction material was obtained in the same manner as in Example 1 except that the content was 33% by weight. (Example 3) A granular lubricating material (C) was obtained in the same manner as in Example 1 except that a titania powder having a center particle size of 10 µm and a Mohs hardness of 6 was used as the inorganic powder.
【００２１】そして、上記粒状減摩材（Ａ）の代わりに
この粒状減摩材（Ｃ）を用いるとともに粒状減摩材
（Ｃ）の添加量を１２重量％とし、かつ硫酸バリウムの
添加量を４１重量％とすること以外は、上記実施例１と
同様にして摩擦材を得た。 （実施例４）グラファイト粉末の添加量を９５重量％と
し、かつ無機物粉末として中心粒径５μｍ、モース硬度
９のアルミナ粉末５重量％とすること以外は上記実施例
１と同様にして粒状減摩材（Ｄ）を得た。The granular lubricant (C) is used in place of the granular lubricant (A), the amount of the particulate lubricant (C) is set to 12% by weight, and the amount of the barium sulfate is reduced to 12% by weight. A friction material was obtained in the same manner as in Example 1 except that the amount was 41% by weight. Example 4 Granular lubrication was carried out in the same manner as in Example 1 except that the amount of graphite powder added was 95% by weight, and the inorganic powder was 5% by weight of alumina powder having a center particle size of 5 μm and a Mohs hardness of 9. Material (D) was obtained.
【００２２】そして、上記粒状減摩材（Ａ）の代わりに
この粒状減摩材（Ｄ）を用いるとともに粒状減摩材
（Ｄ）の添加量を１２重量％とし、かつ硫酸バリウムの
添加量を４１重量％とすること以外は、上記実施例１と
同様にして摩擦材を得た。 （実施例５）グラファイト粉末の添加量を８０重量％と
し、かつ無機物粉末として中心粒径５μｍ、モース硬度
９のアルミナ粉末２０重量％とすること以外は上記実施
例１と同様にして粒状減摩材（Ｅ）を得た。The particulate lubricant (D) is used in place of the particulate lubricant (A), the particulate lubricant (D) is added in an amount of 12% by weight, and the barium sulfate is added in an amount of 12% by weight. A friction material was obtained in the same manner as in Example 1 except that the amount was 41% by weight. Example 5 Granular lubrication was carried out in the same manner as in Example 1 except that the amount of graphite powder added was 80% by weight, and the inorganic powder was 20% by weight of alumina powder having a center particle size of 5 μm and a Mohs hardness of 9. Material (E) was obtained.
【００２３】そして、上記粒状減摩材（Ａ）の代わりに
この粒状減摩材（Ｅ）を用いるとともに粒状減摩材
（Ｅ）の添加量を１２重量％とし、かつ硫酸バリウムの
添加量を４１重量％とすること以外は、上記実施例１と
同様にして摩擦材を得た。 （比較例１）粒状減摩材の代わりに、アブレッシブ剤と
してのアルミナ粉末（中心粒径５μｍ）２．４重量％及
び摩擦調整剤としてのグラファイト粉末９．６重量％を
用い、かつ硫酸バリウムの添加量を４１重量％とするこ
と以外は、上記実施例１と同様にして摩擦材を得た。The particulate lubricant (E) is used in place of the particulate lubricant (A), the addition amount of the particulate lubricant (E) is 12% by weight, and the addition amount of barium sulfate is A friction material was obtained in the same manner as in Example 1 except that the amount was 41% by weight. (Comparative Example 1) 2.4 wt% of alumina powder (central particle size: 5 µm) as an abrasive and 9.6 wt% of graphite powder as a friction modifier were used instead of the particulate lubricant, and barium sulfate was used. A friction material was obtained in the same manner as in Example 1 except that the addition amount was 41% by weight.
【００２４】（比較例２）上記粒状減摩材（Ａ）の添加
量を１重量％とし、かつ硫酸バリウムの添加量を５２重
量％とすること以外は、上記実施例１と同様にして摩擦
材を得た。 （比較例３）上記粒状減摩材（Ａ）の代わりに、実施例
２で得た粒状減摩材（Ｂ）を用いるとともに粒状減摩材
（Ｂ）の添加量を３０重量％とし、かつ硫酸バリウムの
添加量を２３重量％とすること以外は、上記実施例１と
同様にして摩擦材を得た。Comparative Example 2 Friction was carried out in the same manner as in Example 1 except that the addition amount of the above-mentioned particulate anti-friction material (A) was 1% by weight and the addition amount of barium sulfate was 52% by weight. Wood was obtained. (Comparative Example 3) The granular lubricating material (B) obtained in Example 2 was used in place of the granular lubricating material (A), the amount of the granular lubricating material (B) added was 30% by weight, and A friction material was obtained in the same manner as in Example 1 except that the addition amount of barium sulfate was 23% by weight.
【００２５】（摩擦係数、摩耗率の測定）上記実施例１
〜５の摩擦材及び比較例１〜３の摩擦材について、摩擦
係数及びパッド摩耗率を測定した。これは、キャリパ型
式：ＰＤ５１ｓ、ロータ：１８ｍｍベンチレーテドタイ
プ、イナーシャ：３．５ｋｇｆｍｓ2 、制動初速度：５
０ｋｍ／ｈ、減速度：０．１Ｇ、摩擦材温度：１００
℃、制動回数：２０００回の条件で試験を行い、制動回
数１００回での摩擦材の摩擦係数と、制動回数２０００
回での摩擦材の摩擦係数及び摩耗率を測定した。これら
の結果を表２に併せて示す。(Measurement of Coefficient of Friction and Wear Rate) Example 1
The friction coefficient and the pad wear rate of the friction materials of Comparative Examples 1 to 5 and the friction materials of Comparative Examples 1 to 3 were measured. This is a caliper type: PD51s, rotor: 18 mm ventilated type, inertia: 3.5 kgfms 2 , initial braking speed: 5
0 km / h, deceleration: 0.1 G, friction material temperature: 100
The test was conducted under the conditions of ℃, the number of braking: 2000 times, and the coefficient of friction of the friction material at the number of braking 100 and the number of braking 2000
The coefficient of friction and the wear rate of the friction material at each time were measured. These results are also shown in Table 2.
【００２６】[0026]
【表２】 表２からも明らかなように、本実施例１〜５の摩擦材
は、いずれも摩擦係数が安定しており、かつ耐摩耗性も
良好だった。[Table 2] As is clear from Table 2, all of the friction materials of Examples 1 to 5 had a stable friction coefficient and good abrasion resistance.
【００２７】これに対して、本発明に係る粒状減摩材を
用いずに、アルミナ粉末、グラファイト粉末をそれぞれ
単独で添加した比較例１の摩擦材は、摩擦係数の低下が
著しかった。これはグラファイトが相手材表面に移着し
たグラファイト被膜に起因していると考えられる。ま
た、本発明に係る粒状減摩材の添加量が少な過ぎる比較
例２の摩擦材は、摩擦係数は安定していたが、耐摩耗性
が著しく劣っていた。これは、摩擦材中のグラファイト
量が少なく耐摩耗性に劣るとともに、相手材へのグラフ
ァイトの移着が少なかったためと考えられる。On the other hand, in the friction material of Comparative Example 1 in which the alumina powder and the graphite powder were independently added without using the particulate lubricant according to the present invention, the friction coefficient was significantly reduced. This is considered to be due to the graphite coating which was transferred to the surface of the counterpart material. Further, the friction material of Comparative Example 2 in which the amount of the particulate lubricating material according to the present invention was too small had a stable friction coefficient, but was extremely poor in wear resistance. This is presumably because the amount of graphite in the friction material was small and the wear resistance was poor, and the transfer of graphite to the mating material was small.
【００２８】また、本発明に係る粒状減摩材の添加量が
多過ぎる比較例３の摩擦材は、耐摩耗性は良好だった
が、摩擦係数が低下していた。これは、相手材へのグラ
ファイト移着量が多過ぎて十分に除去できなかったため
と考えられる。The friction material of Comparative Example 3 in which the amount of the particulate lubricating material according to the present invention was too large had good wear resistance, but had a low friction coefficient. This is presumably because the amount of graphite transferred to the counterpart material was too large to be sufficiently removed.
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C09K 3/14 C08J 5/14 F16D 69/02 Continuation of front page (58) Field surveyed (Int.Cl. 7 , DB name) C09K 3/14 C08J 5/14 F16D 69/02
Claims (1)
上で、相手材表面に移着したグラファイト被膜を取り除
くアブレッシブ剤として機能しうる無機物粉末と、該無
機物粉末の表面に被着されたグラファイトとを有する粒
状減摩材が３〜２０重量％含有されていることを特徴と
する摩擦材。1. A graphite coating having a center particle size of 1 to 15 μm and a Mohs hardness of 6 or more, which has been transferred to the surface of a counterpart material, is removed.
A friction material comprising 3 to 20% by weight of a particulate lubricating material having an inorganic powder capable of functioning as an abrasive agent and graphite adhered to the surface of the inorganic powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04173533A JP3134239B2 (en) | 1992-06-30 | 1992-06-30 | Friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04173533A JP3134239B2 (en) | 1992-06-30 | 1992-06-30 | Friction material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0617031A JPH0617031A (en) | 1994-01-25 |
| JP3134239B2 true JP3134239B2 (en) | 2001-02-13 |
Family
ID=15962301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04173533A Expired - Fee Related JP3134239B2 (en) | 1992-06-30 | 1992-06-30 | Friction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3134239B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429420B (en) * | 2008-01-03 | 2012-05-23 | 殷国忠 | Antifriction material of molybdenum disulfide and method of producing the same |
| RU2463386C2 (en) * | 2010-07-02 | 2012-10-10 | Владимир Иванович Колесников | Method to form high-strength antifriction coatings on metal surfaces |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9401137D0 (en) * | 1994-01-21 | 1994-03-16 | Ferodo Ltd | Improvements in and relating to friction materials |
| WO2006093805A2 (en) * | 2005-02-25 | 2006-09-08 | Superior Graphite Co. | Graphite coating of particulate materials |
| WO2016084235A1 (en) * | 2014-11-28 | 2016-06-02 | 株式会社ハーモニック・ドライブ・システムズ | Method for lubricating strain wave gearing |
-
1992
- 1992-06-30 JP JP04173533A patent/JP3134239B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429420B (en) * | 2008-01-03 | 2012-05-23 | 殷国忠 | Antifriction material of molybdenum disulfide and method of producing the same |
| RU2463386C2 (en) * | 2010-07-02 | 2012-10-10 | Владимир Иванович Колесников | Method to form high-strength antifriction coatings on metal surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0617031A (en) | 1994-01-25 |
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