JP6440947B2 - Friction material composition, friction material using friction material composition, and friction member - Google Patents
Friction material composition, friction material using friction material composition, and friction member Download PDFInfo
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Description
本発明は、自動車等の制動に用いられるディスクブレーキパッド、ブレーキライニング等の摩擦材に適した摩擦材組成物、該摩擦材組成物を用いた摩擦材及び摩擦部材に関する。 The present invention relates to a friction material composition suitable for friction materials such as disc brake pads and brake linings used for braking of automobiles, etc., and a friction material and a friction member using the friction material composition.
自動車等には、その制動のためにディスクブレーキパッドやブレーキライニング等の摩擦材が使用されている。ディスクブレーキパッドやブレーキライニング等の摩擦材は、相手材となるディスクロータやブレーキドラム等と摩擦することによって制動の役割を果たす。そのため摩擦材には、使用条件に応じた適切な摩擦係数(効き特性)が求められるだけでなく、鳴きが発生しにくいこと(鳴き特性)、摩擦材の寿命が長いこと(耐摩耗性)等が要求される。また、安全性だけでなく運転時の快適性からも、ブレーキ時のトルク振動が小さいこと(BTV=Brake Torque Variation特性)が求められる。 In automobiles and the like, friction materials such as disc brake pads and brake linings are used for braking. Friction materials such as a disc brake pad and a brake lining play a role of braking by friction with a disc rotor, a brake drum, or the like as a counterpart material. For this reason, friction materials are not only required to have an appropriate coefficient of friction (effect characteristics) according to the conditions of use, but are also less likely to squeal (squeal characteristics), and have a long life (friction resistance). Is required. In addition to safety as well as driving comfort, torque vibration during braking is required to be small (BTV = Brake Torque Variation characteristics).
さらに近年、燃費向上の観点で自動車の軽量化が求められており、特に効果の大きいバネ下荷重の軽量化が着目されている。従って、摩擦材の軽量化は自動車の燃費向上に有効であるが、従来の摩擦材には、銅や酸化ジルコニウムといった高比重の素材が一般的に使用されている。 Furthermore, in recent years, there has been a demand for weight reduction of automobiles from the viewpoint of improving fuel efficiency, and attention has been focused on weight reduction of unsprung loads, which is particularly effective. Therefore, although the weight reduction of the friction material is effective for improving the fuel efficiency of the automobile, a material having a high specific gravity such as copper or zirconium oxide is generally used for the conventional friction material.
銅は摩擦材への熱伝導率付与、繊維形状で使用した際の補強効果付与等を目的として添加され、例えば銅繊維の減量によって高温時のマトリクス補強効果が低下し、耐摩耗性が低下してしまう。また、銅の減量によって摩擦界面の熱拡散効率が低下し、相手材のディスクロータに局所的な温度勾配(ヒートスポット)が形成され、トルク振動が大きくなってしまう。一方で、銅は摩耗粉として河川や湖を汚染するという観点から、摩擦材に添加しないことが望まれている。 Copper is added for the purpose of imparting thermal conductivity to the friction material, reinforcing effect when used in fiber shape, etc.For example, reducing the copper fiber reduces the matrix reinforcing effect at high temperatures and reduces wear resistance. End up. Further, the heat diffusion efficiency at the friction interface decreases due to the reduction of copper, and a local temperature gradient (heat spot) is formed on the disk rotor of the mating member, resulting in increased torque vibration. On the other hand, it is desired not to add copper to the friction material from the viewpoint of contaminating rivers and lakes as wear powder.
また、酸化ジルコニウムは高融点の無機充填材で、モース硬度が相手材の鋳鉄よりも高いため研削材として機能しており、減量によって摩擦係数が低下してしまう。 Zirconium oxide is a high-melting-point inorganic filler, which has a higher Mohs hardness than the counterpart cast iron and functions as an abrasive.
上記弊害の改善策として、銅繊維を他の高熱伝導素材や無機繊維に、酸化ジルコニウムを他の軽量な研削材に代替する手法が検討されてきた。 As measures for improving the above-described adverse effects, methods have been studied in which copper fibers are replaced with other highly heat-conductive materials and inorganic fibers, and zirconium oxide is replaced with other lightweight abrasives.
例えば、銅を使用せず、低比重で熱伝導率も酸化ジルコニウムより高い研削材である酸化マグネシウムと熱伝導率が高い黒鉛を摩擦材中に45〜80体積%含有し、酸化マグネシウムと黒鉛の比率を1/1〜4/1とする方法が提案されている(特許文献1)。 For example, the friction material contains 45-80% by volume of magnesium oxide, which is a grinding material that does not use copper, has a low specific gravity, and has a thermal conductivity higher than that of zirconium oxide, and graphite having a high thermal conductivity. A method of setting the ratio to 1/1 to 4/1 has been proposed (Patent Document 1).
また、摩擦材の補強を目的として金属繊維や鉱物繊維と共に、ウォラストナイトを10〜15質量%と比較的多く添加する方法が提案されている(特許文献2)。 In addition, a method has been proposed in which wollastonite is added in a relatively large amount of 10 to 15% by mass together with metal fibers and mineral fibers for the purpose of reinforcing the friction material (Patent Document 2).
また、摩擦材の補強を目的として2〜30質量%の針状炭酸カルシウムを添加する方法が提案されている(特許文献3)。 A method of adding 2 to 30% by mass of acicular calcium carbonate for the purpose of reinforcing the friction material has been proposed (Patent Document 3).
特許文献1のブレーキ用摩擦材では、研削材である酸化マグネシウムと、潤滑材である黒鉛の添加量が極端に多くなり、各種摩擦特性をバランス良く改善することは困難であるとの課題がある。 In the brake friction material of Patent Document 1, there is a problem that the addition amount of magnesium oxide as a grinding material and graphite as a lubricant is extremely increased, and it is difficult to improve various friction characteristics in a balanced manner. .
また、特許文献2のブレーキ用摩擦材では、繊維基材の添加量の合計が極端に多くなってしまい、摩擦材の気孔率増加による強度低下、圧縮歪量増加によるブレーキのペダルフィール悪化を招いてしまう。 In addition, in the brake friction material of Patent Document 2, the total amount of the fiber base material is extremely increased, leading to a decrease in strength due to an increase in the porosity of the friction material and a deterioration in brake pedal feel due to an increase in the amount of compressive strain. I will.
また、特許文献3の方法のように、摩擦材の補強を目的として針状炭酸カルシウムを用いる場合、炭酸カルシウムは低比重ではあるが融点が低く、特に銅繊維を含有しない組成では高温時の耐摩耗性等が悪化してしまう。 Further, when acicular calcium carbonate is used for the purpose of reinforcing the friction material as in the method of Patent Document 3, calcium carbonate has a low specific gravity but a low melting point, and in particular, a composition containing no copper fiber is resistant to high temperatures. Wearability etc. will deteriorate.
一方で、摩擦材の小型化によっても軽量化は図ることが可能であるが、摩擦面積を縮小した場合は摩擦面の単位面積当たりの熱負荷が高まり、特に銅を含有しない組成では耐摩耗性の悪化が懸念される。また、摩擦材の薄型化によって軽量化を図ると、製品寿命が短くなってしまう。 On the other hand, it is possible to reduce the weight by reducing the size of the friction material, but when the friction area is reduced, the heat load per unit area of the friction surface is increased, and particularly in the composition containing no copper, wear resistance is increased. There is concern about the deterioration. Further, if the weight is reduced by making the friction material thinner, the product life is shortened.
そこで本発明は、銅含有率が0.5質量%を超えない環境有害性が低い組成で、良好な効き特性、耐摩耗性、BTV特性を有し、さらに軽量であることで自動車の燃費向上に効果的である摩擦材を与える摩擦材組成物を提供することを目的とする。また、該摩擦材組成物を用いた摩擦材及び摩擦部材を提供することを目的とする。 Therefore, the present invention is a composition with low environmental hazards in which the copper content does not exceed 0.5% by mass, has good efficacy characteristics, wear resistance, BTV characteristics, and is lighter in weight, thereby improving automobile fuel efficiency. It is an object of the present invention to provide a friction material composition that provides a friction material that is effective for the above. Another object of the present invention is to provide a friction material and a friction member using the friction material composition.
本発明者等は、上記目標を達成するため、元素としての銅含有率が0.5質量%を超えず、鉄系繊維又は鉄系粉末を1〜3質量%含有し、かつ、繊維基材としてウォラストナイトを10〜30質量%含有することで、銅添加量が極めて少ない、あるいは銅を含有しなくても、効き特性、耐摩耗性、BTV特性をバランス良く向上しつつ、軽量化が可能であることを見出した。 In order to achieve the above-mentioned goal, the present inventors do not exceed 0.5% by mass of copper as an element, contain 1-3% by mass of iron-based fiber or iron-based powder, and a fiber base material. By containing 10-30% by weight of wollastonite, the amount of added copper is very small, or even if it does not contain copper, the effect characteristics, wear resistance, and BTV characteristics are improved in a well-balanced manner while reducing weight. I found it possible.
本発明は次の事項に関する。
(1)結合材、有機充填材、無機充填材、及び繊維基材を含有する摩擦材組成物であり、元素としての銅含有率が0.5質量%を超えず、鉄系繊維又は鉄系粉末を1〜3質量%含有し、かつ、繊維基材としてウォラストナイトを10〜30質量%含有する摩擦材組成物。
(2)研削材として酸化マグネシウムを1〜10質量%含有する(1)に記載の摩擦材組成物。
(3)無機充填材として黒鉛を1〜10質量%含有し、該黒鉛のメジアン径が1〜30μmである(1)又は(2)に記載の摩擦材組成物。
(4)有機充填材としてカシューダストを2〜8質量%含有する請求項(1)〜(3)に記載の摩擦材組成物。
(5)(1)〜(4)のいずれか一項に記載の摩擦材組成物を成形してなる摩擦材。
(6)(5)記載の摩擦材と裏金とを一体化した摩擦部材。
The present invention relates to the following matters.
(1) A friction material composition containing a binder, an organic filler, an inorganic filler, and a fiber base material, and the copper content as an element does not exceed 0.5 mass%, and is an iron-based fiber or iron-based material A friction material composition containing 1-3% by mass of powder and 10-30% by mass of wollastonite as a fiber base material.
(2) The friction material composition according to (1), which contains 1 to 10% by mass of magnesium oxide as an abrasive.
(3) The friction material composition according to (1) or (2), wherein 1 to 10% by mass of graphite is contained as an inorganic filler, and the median diameter of the graphite is 1 to 30 μm.
(4) The friction material composition according to any one of claims (1) to (3), which contains 2 to 8% by mass of cashew dust as an organic filler.
(5) A friction material formed by molding the friction material composition according to any one of (1) to (4).
(6) A friction member in which the friction material according to (5) and a back metal are integrated.
本発明によれば、自動車用ディスクブレーキパッドやブレーキライニング等の摩擦材に用いた際に、銅含有量を抑制して、環境有害性が低い組成としつつ、良好な効き特性、耐摩耗性、BTV特性を有し、さらに軽量であることで自動車の燃費向上に寄与する摩擦材を与える摩擦材組成物を提供することができる。また、本発明によれば、上記特性を有する摩擦材及び摩擦部材を提供することができる。 According to the present invention, when used in a friction material such as an automotive disc brake pad or brake lining, the copper content is suppressed, while having a composition with low environmental hazards, good effect characteristics, wear resistance, It is possible to provide a friction material composition that has a BTV characteristic and provides a friction material that contributes to improving the fuel efficiency of an automobile by being lightweight. Moreover, according to this invention, the friction material and friction member which have the said characteristic can be provided.
以下、本発明のノンアスベスト摩擦材組成物、これを用いた摩擦材及び摩擦部材について詳述する。 Hereinafter, the non-asbestos friction material composition of the present invention, the friction material using the same, and the friction member will be described in detail.
[ノンアスベスト摩擦材組成物]
本実施形態のノンアスベスト摩擦材組成物は、結合材、有機充填材、無機充填材、及び繊維基材を含有する摩擦材組成物であって、元素としての銅含有率が0.5質量%を超えず、鉄系繊維又は鉄系粉末を1〜3質量%含有し、かつ、繊維基材としてウォラストナイトを10〜30質量%含有することを特徴とする。なお、上記の「元素としての銅含有率」とは、繊維状や粉末状等の銅、銅合金及び銅化合物に含まれる銅元素の、全摩擦材組成物中における含有率を示す。
[Non-asbestos friction material composition]
The non-asbestos friction material composition of this embodiment is a friction material composition containing a binder, an organic filler, an inorganic filler, and a fiber base material, and the copper content as an element is 0.5% by mass. 1 to 3% by mass of iron-based fiber or iron-based powder and 10 to 30% by mass of wollastonite as a fiber base material. In addition, said "copper content rate as an element" shows the content rate in the total friction material composition of the copper element contained in copper, copper alloy, and a copper compound, such as fibrous form and a powder form.
上記構成により、本実施形態のノンアスベスト摩擦材組成物を用いた摩擦材及び摩擦部材は、銅添加量が極めて少ない、あるいは銅を含有しないため、従来品と比較して制動時に生成に生成する摩耗粉中の銅が少なく、さらに軽量であることから自動車の燃費向上に寄与するため環境に優しく、良好な効き特性、耐摩耗性、BTV特性をバランス良く発現する。 With the above configuration, the friction material and the friction member using the non-asbestos friction material composition of the present embodiment have a very small amount of copper added or do not contain copper, so that they are generated during braking compared to conventional products. Since it has less copper in the wear powder and is lighter in weight, it contributes to improving the fuel efficiency of automobiles. It is environmentally friendly and exhibits good efficacy, wear resistance, and BTV characteristics in a well-balanced manner.
[無機充填材]
本実施形態の摩擦材組成物は無機充填材を含有する。無機充填材は、摩擦材の耐熱性の悪化を避けるために摩擦調整材として含まれるものである。本実施形態において、無機充填材としては、対面材への攻撃性低下の観点から、酸化マグネシウム、黒鉛、硫酸バリウムを含有することが好ましい。
[Inorganic filler]
The friction material composition of this embodiment contains an inorganic filler. The inorganic filler is included as a friction modifier in order to avoid deterioration of the heat resistance of the friction material. In the present embodiment, the inorganic filler preferably contains magnesium oxide, graphite, and barium sulfate from the viewpoint of reducing the aggressiveness to the facing material.
上記酸化マグネシウムの含有率は1〜10質量%であることが好ましく、2〜10質量%であることがより好ましく、3〜10質量%であることがさらに好ましい。また、上記酸化マグネシウムのメジアン径は、1〜20μmであることが好ましく、1〜15μmであることがより好ましく、1〜10μmであることがさらに好ましい。酸化マグネシウムのメジアン径を1μm以上とすることで良好な摩擦係数、耐摩耗性が発現し、20μm以下とすることで摩擦材中の分散性を高め、摩擦係数を安定化できる。 The magnesium oxide content is preferably 1 to 10% by mass, more preferably 2 to 10% by mass, and even more preferably 3 to 10% by mass. Moreover, it is preferable that the median diameter of the said magnesium oxide is 1-20 micrometers, It is more preferable that it is 1-15 micrometers, It is further more preferable that it is 1-10 micrometers. By setting the median diameter of magnesium oxide to 1 μm or more, a good friction coefficient and wear resistance are exhibited, and by setting it to 20 μm or less, dispersibility in the friction material can be improved and the friction coefficient can be stabilized.
また、上記黒鉛の含有率は1〜10質量%であることが好ましく、1〜9質量%であることがより好ましく、2〜8質量%であることがさらに好ましい。また、上記黒鉛のメジアン径は、1〜100μmであることが好ましく、1〜50μmであることがより好ましく、1〜30μmであることがさらに好ましい。黒鉛のメジアン径を1μm以上とすることで良好な摩擦係数、耐摩耗性が発現し、100μm以下とすることで、摩擦材の熱伝導率低下を避けることができる。 Moreover, it is preferable that the content rate of the said graphite is 1-10 mass%, It is more preferable that it is 1-9 mass%, It is further more preferable that it is 2-8 mass%. Moreover, it is preferable that the median diameter of the said graphite is 1-100 micrometers, It is more preferable that it is 1-50 micrometers, It is further more preferable that it is 1-30 micrometers. By setting the median diameter of graphite to 1 μm or more, a good friction coefficient and wear resistance are exhibited, and by setting it to 100 μm or less, it is possible to avoid a decrease in the thermal conductivity of the friction material.
なお、上記酸化マグネシウムと黒鉛のメジアン径は、レーザー回折粒度分布測定等の方法を用いて測定することができる。例えば、レーザー回折/散乱式粒子径分布測定装置、商品名:LA・920(株式会社堀場製作所製)で測定することができる。また、本発明の効果を損なわない程度であれば、本実施形態の摩擦材組成物に、上記酸化マグネシウム以外の、通常、摩擦材に用いられる無機充填材を組み合わせて用いることができる。 The median diameter of the magnesium oxide and graphite can be measured using a method such as laser diffraction particle size distribution measurement. For example, it can be measured with a laser diffraction / scattering particle size distribution measuring device, trade name: LA.920 (manufactured by Horiba, Ltd.). Moreover, if it is a grade which does not impair the effect of this invention, the inorganic filler normally used for a friction material other than the said magnesium oxide can be used in combination with the friction material composition of this embodiment.
上記酸化マグネシウム以外の無機充填材としては、例えば、酸化ジルコニウム、三硫化アンチモン、硫化スズ、二硫化モリブデン、硫化鉄、硫化ビスマス、硫化亜鉛、水酸化カルシウム、酸化カルシウム、炭酸ナトリウム、炭酸カルシウム、炭酸マグネシウム、硫酸バリウム、ドロマイト、コークス、黒鉛、マイカ、酸化鉄、バーミキュライト、粒状チタン酸カリウム、チタン酸リチウムカリウム、硫酸カルシウム、板状チタン酸カリウム、タルク、クレー、ゼオライト、珪酸ジルコニウム、ムライト、クロマイト、酸化チタン、シリカ、γ−アルミナ等の活性アルミナを用いることができ、これらを単独で又は2種類以上を組み合わせて使用することができる。 Examples of inorganic fillers other than magnesium oxide include zirconium oxide, antimony trisulfide, tin sulfide, molybdenum disulfide, iron sulfide, bismuth sulfide, zinc sulfide, calcium hydroxide, calcium oxide, sodium carbonate, calcium carbonate, and carbonic acid. Magnesium, barium sulfate, dolomite, coke, graphite, mica, iron oxide, vermiculite, granular potassium titanate, lithium potassium titanate, calcium sulfate, plate-like potassium titanate, talc, clay, zeolite, zirconium silicate, mullite, chromite, Activated alumina such as titanium oxide, silica, and γ-alumina can be used, and these can be used alone or in combination of two or more.
前記無機充填材の総含有量は、酸化マグネシウム、黒鉛を含め、摩擦材用組成物において20〜80質量%であることが好ましく、30〜80質量%であることがより好ましく40〜80質量%であることがさらに好ましい。無機充填材の含有量を20〜80質量%とすると、耐熱性の悪化を避けることができる。 The total content of the inorganic filler, including magnesium oxide and graphite, is preferably 20 to 80% by mass, more preferably 30 to 80% by mass in the friction material composition, and 40 to 80% by mass. More preferably. When content of an inorganic filler shall be 20-80 mass%, a heat resistant deterioration can be avoided.
[繊維基材]
本実施形態の摩擦材組成物は繊維基材を含有する。繊維基材は摩擦材において補強作用を示すものである。繊維基材としては、有機繊維、金属繊維、無機繊維等が挙げられる。
[Fiber base]
The friction material composition of this embodiment contains a fiber base material. The fiber base material exhibits a reinforcing action in the friction material. Examples of the fiber base material include organic fibers, metal fibers, and inorganic fibers.
本実施形態の摩擦材組成物は有機繊維としてアラミド繊維、アクリル繊維、セルロース繊維、フェノール樹脂繊維等を用いることができ、これらを単独で又は2種類以上を組み合わせて使用することができる。この中でも、耐熱性、補強効果の観点から、アラミド繊維を用いることが好ましい。 The friction material composition of this embodiment can use an aramid fiber, an acrylic fiber, a cellulose fiber, a phenol resin fiber, etc. as an organic fiber, and these can be used individually or in combination of 2 or more types. Among these, it is preferable to use an aramid fiber from the viewpoint of heat resistance and a reinforcing effect.
金属繊維としては銅繊維、鉄系繊維、チタン繊維、亜鉛繊維、アルミ繊維等を用いることができ、1種又は2種類以上を組み合わせて用いることができるが、銅繊維を用いる場合は、摩擦材中の元素としての銅含有率が0.5質量%を超えないようにする。 As the metal fiber, copper fiber, iron-based fiber, titanium fiber, zinc fiber, aluminum fiber, etc. can be used, and one kind or a combination of two or more kinds can be used. The copper content as an element in the inside should not exceed 0.5 mass%.
また、本実施形態の摩擦材組成物は金属繊維として鉄系繊維1〜3質量%を含有する。 Moreover, the friction material composition of this embodiment contains 1-3 mass% of iron-type fibers as a metal fiber.
なお、ここでいう鉄系繊維とは、純鉄繊維、鋼繊維、鋳鉄繊維、ステンレス繊維、シリコンやアルミとの鉄系合金繊維等が挙げられる。本明細書では、上記の鋼繊維を鉄繊維と記載する。 The iron-based fiber mentioned here includes pure iron fiber, steel fiber, cast iron fiber, stainless steel fiber, iron-based alloy fiber with silicon and aluminum, and the like. In this specification, said steel fiber is described as an iron fiber.
摩擦材組成物における上記鉄系繊維の含有量を1質量%以上とすることで、良好な耐摩耗性、BTV特性が発現し、3質量%以下とすることで相手材であるディスクロータへの攻撃性、摩擦面における錆の発生を抑制できる。上記鉄系繊維の含有量は、1.2〜3質量%であることがより好ましく、1.4〜3質量%であることがさらに好ましい。 By setting the content of the iron-based fiber in the friction material composition to 1% by mass or more, good wear resistance and BTV characteristics are expressed, and by setting the content to 3% by mass or less, the disk rotor as a counterpart material is applied. Aggression and generation of rust on the friction surface can be suppressed. As for content of the said iron-type fiber, it is more preferable that it is 1.2-3 mass%, and it is further more preferable that it is 1.4-3 mass%.
また、上記鉄系素材の形状は繊維形状に限定されるものではなく、粉末状で用いても同様の効果を発現することができる。 Further, the shape of the iron-based material is not limited to the fiber shape, and the same effect can be exhibited even when used in powder form.
無機繊維としては、ウォラストナイト、セラミック繊維、生分解性セラミック繊維、鉱物繊維、炭素繊維、ガラス繊維、チタン酸カリウム繊維、アルミノシリケート繊維等を用いることができ、1種又は2種類以上を組み合わせて用いることができるが、環境への優しさの観点から、吸引性のチタン酸カリウム繊維等を含有しないことが好ましい。また、本実施形態の摩擦材組成物は、無機繊維として繊維長30μm以下のウォラストナイト10〜30質量%を含有する。 As the inorganic fiber, wollastonite, ceramic fiber, biodegradable ceramic fiber, mineral fiber, carbon fiber, glass fiber, potassium titanate fiber, aluminosilicate fiber, etc. can be used, one or a combination of two or more types However, from the viewpoint of environmental friendliness, it is preferable not to contain attractive potassium titanate fibers. Moreover, the friction material composition of this embodiment contains 10-30 mass% of wollastonite whose fiber length is 30 micrometers or less as an inorganic fiber.
摩擦材組成物における上記ウォラストナイトの含有量を10質量%以上とすることで、良好な摩擦係数、耐摩耗性が発現し、30質量%以下とすることで、摩擦材の気孔率、圧縮歪量の増大を避けることができる。上記ウォラストナイトの含有量は、10〜25質量%であることがより好ましく、10〜20質量%であることがさらに好ましい。 By setting the content of the wollastonite in the friction material composition to 10% by mass or more, a good friction coefficient and wear resistance are expressed, and by setting the content to 30% by mass or less, the porosity and compression of the friction material An increase in the amount of distortion can be avoided. As for content of the said wollastonite, it is more preferable that it is 10-25 mass%, and it is further more preferable that it is 10-20 mass%.
なお、ここでいう鉱物繊維とは、スラグウール等の高炉スラグ、バサルトファイバー等の玄武岩、その他の天然岩石等を主成分として溶融紡糸した人造無機繊維であり、Al元素を含む天然鉱物であることがより好ましい。具体的には、SiO2、Al2O3、CaO、MgO、FeO、Na2O等が含まれるもの、又はこれら化合物が1種又は2種以上含有されるものを鉱物繊維として用いることができ、これらのうちAl元素を含むものがより好ましい。摩擦材組成物中に含まれる鉱物繊維全体の平均繊維長が大きくなるほど摩擦組成物中の各成分との接着強度が低下する傾向があるため、鉱物繊維全体の平均繊維長は500μm以下が好ましく、より好ましくは100〜400μmである。ここで、平均繊維長とは、該当する全ての繊維の長さの平均値を示した数平均繊維長のことをいう。例えば200μmの平均繊維長とは、摩擦材組成物原料として用いる鉱物繊維を無作為に50個選択し、光学顕微鏡で繊維長を測定し、その平均値が200μmであることを示す。 The mineral fiber referred to here is a man-made inorganic fiber melt-spun mainly composed of blast furnace slag such as slag wool, basalt such as basalt fiber, and other natural rocks, and is a natural mineral containing Al element. Is more preferable. Specifically, those containing SiO 2 , Al 2 O 3 , CaO, MgO, FeO, Na 2 O, etc., or those containing one or more of these compounds can be used as mineral fibers. Of these, those containing an Al element are more preferred. Since the adhesive strength with each component in the friction composition tends to decrease as the average fiber length of the entire mineral fiber contained in the friction material composition increases, the average fiber length of the entire mineral fiber is preferably 500 μm or less, More preferably, it is 100-400 micrometers. Here, the average fiber length refers to a number average fiber length indicating an average value of the lengths of all corresponding fibers. For example, the average fiber length of 200 μm indicates that 50 mineral fibers used as a friction material composition raw material are randomly selected, the fiber length is measured with an optical microscope, and the average value is 200 μm.
本実施形態で用いられる鉱物繊維は、人体有害性の観点で生体溶解性であることが好ましい。ここでいう生体溶解性の鉱物繊維とは、人体内に取り込まれた場合でも短時間で一部分解され体外に排出される特徴を有する鉱物繊維である。具体的には、化学組成がアルカリ酸化物、アルカリ土類酸化物総量(ナトリウム、カリウム、カルシウム、マグネシウム、バリウムの酸化物の総量)が18質量%以上で、かつ呼吸による短期バイオ永続試験で、20μm以上の繊維の質量半減期が40日以内又は腹膜内試験で過度の発癌性の証拠がないか又は長期呼吸試験で関連の病原性や腫瘍発生がないことを満たす繊維を示す(EU指令97/69/ECのNota Q(発癌性適用除外))。このような生体分解性鉱物繊維としては、SiO2−Al2O3−CaO−MgO−FeO−Na2O系繊維等が挙げられ、SiO2、Al2O3、CaO、MgO、FeO、Na2O等を任意の組み合わせで含有した繊維が挙げられる。市販品としてはLAPINUS FIBERS B.V.製のRoxulシリーズ(「Roxul」は、登録商標。)等が挙げられる。「Roxul」には、SiO2、Al2O3、CaO、MgO、FeO、Na2O等が含まれる。 The mineral fiber used in the present embodiment is preferably biosoluble from the viewpoint of human harm. The term “biosoluble mineral fiber” as used herein refers to a mineral fiber having a characteristic that even if it is taken into the human body, it is partially decomposed and discharged outside the body in a short time. Specifically, the chemical composition is alkali oxide, alkaline earth oxide total amount (total amount of oxides of sodium, potassium, calcium, magnesium, barium) is 18% by mass or more, and in a short-term biopermanent test by respiration, A fiber that has a mass half-life of 20 μm or more within 40 days or no evidence of excessive carcinogenicity in an intraperitoneal test or that has no associated pathogenicity or tumor development in a long-term respiratory test (EU Directive 97 / 69 / EC Nota Q (carcinogenic exclusion)). Examples of such biodegradable mineral fibers include SiO 2 —Al 2 O 3 —CaO—MgO—FeO—Na 2 O fibers and the like, and include SiO 2 , Al 2 O 3 , CaO, MgO, FeO, Na. Examples thereof include fibers containing 2 O or the like in any combination. As a commercial item, LAPINUS FIBERS B.M. V. Roxul series ("Roxul" is a registered trademark) manufactured by the same company. “Roxul” includes SiO 2 , Al 2 O 3 , CaO, MgO, FeO, Na 2 O and the like.
繊維基材は、摩擦材組成物中に5〜40質量%含有することが好ましく、5〜35質量%含有することがより好ましく、10〜30質量%含有することがさらに好ましい。繊維基材の含有量を5〜40質量%とすると、効き特性の著しい低下等の弊害を与えることなく、適度な補強効果を摩擦材に付与する効果がある。 The fiber base material is preferably contained in the friction material composition in an amount of 5 to 40% by mass, more preferably 5 to 35% by mass, and further preferably 10 to 30% by mass. When the content of the fiber base is 5 to 40% by mass, there is an effect of imparting an appropriate reinforcing effect to the friction material without causing adverse effects such as a significant decrease in effectiveness characteristics.
[結合材]
本実施形態の摩擦材組成物は、結合材を含有する。結合材は、摩擦材組成物に含まれる有機充填材及び繊維基材等を一体化して、強度を与えるものである。本実施形態の摩擦材組成物に含まれる結合材としては、通常、摩擦材に用いられる熱硬化性樹脂を用いることができる。熱硬化性樹脂としては、例えば、フェノール樹脂、アクリル変性フェノール樹脂、シリコーン変性フェノール樹脂、カシュー変性フェノール樹脂、エポキシ変性フェノール樹脂、アルキルベンゼン変性フェノール樹脂等の各種変性フェノール樹脂が挙げられ、特に、フェノール樹脂、アクリル変性フェノール樹脂、シリコーン変性フェノール樹脂が好ましく、これらを単独で又は2種類以上を組み合わせて使用することができる。良好な耐熱性、成形性及び摩擦係数を与えることから、フェノール樹脂、アクリル変性フェノール樹脂、シリコーン変性フェノール樹脂、アルキルベンゼン変性フェノール樹脂を用いることが好ましい。
[Binder]
The friction material composition of this embodiment contains a binder. The binding material provides strength by integrating the organic filler and the fiber base material included in the friction material composition. As the binder contained in the friction material composition of the present embodiment, a thermosetting resin usually used for a friction material can be used. Examples of the thermosetting resin include various modified phenol resins such as a phenol resin, an acrylic modified phenol resin, a silicone modified phenol resin, a cashew modified phenol resin, an epoxy modified phenol resin, and an alkylbenzene modified phenol resin. Acrylic-modified phenolic resins and silicone-modified phenolic resins are preferred, and these can be used alone or in combination of two or more. In order to give good heat resistance, moldability and friction coefficient, it is preferable to use a phenol resin, an acrylic modified phenol resin, a silicone modified phenol resin, or an alkylbenzene modified phenol resin.
本実施形態の摩擦材組成物における、結合材の含有量は、5〜20質量%であることが好ましく、5〜15質量%であることがより好ましく、5〜10質量%であることがさらに好ましい。結合材の含有量を5〜20質量%の範囲とすることで、摩擦材の強度低下をより抑制でき、また、摩擦材の気孔率が減少し、弾性率が高くなることによる鳴き等の音振性能悪化を抑制できる。 In the friction material composition of the present embodiment, the content of the binder is preferably 5 to 20% by mass, more preferably 5 to 15% by mass, and further preferably 5 to 10% by mass. preferable. By setting the content of the binder in the range of 5 to 20% by mass, it is possible to further suppress the strength reduction of the friction material, reduce the porosity of the friction material, and increase the elastic modulus. Vibration performance deterioration can be suppressed.
[有機充填材]
本実施形態の摩擦材組成物は、有機充填材を含有する。有機充填材は、摩擦材の音振性能や耐摩耗性等を向上させるための摩擦調整剤として含まれるものである。本発明の摩擦材用組成物に含まれる有機充填材としては、カシューダストやゴム成分等を用いることができる。
[Organic filler]
The friction material composition of this embodiment contains an organic filler. The organic filler is included as a friction modifier for improving the sound vibration performance and wear resistance of the friction material. As an organic filler contained in the composition for a friction material of the present invention, cashew dust, a rubber component, or the like can be used.
上記カシューダストは、カシューナッツシェルオイルを重合、硬化させたものを粉砕して得られる、通常、摩擦材に用いられるものであればよい。 The cashew dust is not particularly limited as long as it is obtained by pulverizing a cashew nut shell oil that has been polymerized and cured, and is usually used for a friction material.
上記ゴム成分としては、例えば、タイヤゴム、アクリルゴム、イソプレンゴム、NBR(ニトリルブタジエンゴム)、SBR(スチレンブタジエンゴム)が挙げられ、これらを単独で又は2種類以上を組み合わせて使用される。 Examples of the rubber component include tire rubber, acrylic rubber, isoprene rubber, NBR (nitrile butadiene rubber), and SBR (styrene butadiene rubber), and these are used alone or in combination of two or more.
また、カシューダストとゴム成分とを併用してもよく、カシューダストをゴム成分で被覆したものを用いてもよいが、音振性能の観点から、カシューダストとゴム成分とを併用することが好ましい。上記カシューダストの含有量は、2〜8質量%であることが好ましく、2.5〜8質量%であることがより好ましく、2.5〜7.5質量%であることがさらに好ましい。カシューダストの含有量を2〜8質量%とすることで、摩擦材の弾性率が高くなることによる鳴き等の音振性能の悪化を避けることができ、また耐熱性の悪化、熱履歴による強度低下を避けることができる。 In addition, cashew dust and a rubber component may be used in combination, or cashew dust coated with a rubber component may be used, but from the viewpoint of sound vibration performance, it is preferable to use cashew dust and a rubber component in combination. . The cashew dust content is preferably 2 to 8% by mass, more preferably 2.5 to 8% by mass, and even more preferably 2.5 to 7.5% by mass. By setting the cashew dust content to 2 to 8% by mass, it is possible to avoid deterioration of sound vibration performance such as squeal due to an increase in the elastic modulus of the friction material, deterioration of heat resistance, and strength due to thermal history. Degradation can be avoided.
本実施形態のノンアスベスト摩擦材組成物中における、有機充填材の含有量は、1〜20質量%であることが好ましく、1〜15質量%であることがより好ましく、2〜10質量%であることがさらに好ましい。有機充填材の含有量を1〜20質量%の範囲とすることで、摩擦材の弾性率が高くなることによる鳴き等の音振性能の悪化を避けることができ、また耐熱性の悪化、熱履歴による強度低下を避けることができる。 The content of the organic filler in the non-asbestos friction material composition of the present embodiment is preferably 1 to 20% by mass, more preferably 1 to 15% by mass, and 2 to 10% by mass. More preferably it is. By setting the content of the organic filler in the range of 1 to 20% by mass, it is possible to avoid deterioration of sound vibration performance such as squeal due to an increase in the elastic modulus of the friction material, deterioration of heat resistance, heat It is possible to avoid a decrease in strength due to history.
[その他の成分]
また、本実施形態の摩擦材組成物は、前記の材料以外に、必要に応じてその他の材料を配合することができ、例えば、亜鉛粉等の金属粉末等を配合することができる。
[Other ingredients]
Moreover, the friction material composition of this embodiment can mix | blend other materials other than the said material as needed, for example, metal powders, such as zinc powder, etc. can be mix | blended.
<摩擦材及び摩擦部材>
本実施形態の摩擦材組成物は、自動車等のディスクブレーキパッド、ブレーキライニング等の摩擦材として又は本実施形態の摩擦材組成物を目的形状に成形、加工、貼り付け等の工程を施すことによりクラッチフェーシング、電磁ブレーキ、保持ブレーキ等の摩擦材としても使用することができる。
<Friction material and friction member>
The friction material composition of the present embodiment is used as a friction material for disc brake pads, brake linings, etc. of automobiles or by subjecting the friction material composition of the present embodiment to a desired shape, processing, pasting, etc. It can also be used as a friction material for clutch facings, electromagnetic brakes, holding brakes and the like.
本実施形態の摩擦材組成物は、摩擦面となる摩擦部材そのものとして用いて摩擦材を得ることができる。それを用いた摩擦材としては、例えば、下記の構成が挙げられる。
(1)摩擦部材のみの構成
(2)裏金と、該裏金の上に形成させ、摩擦面となる本発明の摩擦材組成物からなる摩擦部材とを有する構成
(3)上記(2)の構成において、裏金と摩擦部材との間に、裏金の接着効果を高めるための表面改質を目的としたプライマー層、裏金と摩擦部材の接着を目的とした接着層をさらに介在させた構成、等が挙げられる。
上記裏金は、摩擦部材の機械的強度の向上のために、通常、摩擦部材として用いるものであり、材質としては、金属又は繊維強化プラスチック等を用いることができ、例えば、鉄、ステンレス、無機繊維強化プラスチック、炭素繊維強化プラスチックが挙げられる。プライマー層及び接着層としては、通常、ブレーキシュー等の摩擦部材に用いられるものであればよい。
The friction material composition of the present embodiment can be used as a friction member itself that becomes a friction surface to obtain a friction material. Examples of the friction material using the same include the following configurations.
(1) Configuration of only friction member (2) Configuration having a back metal and a friction member formed on the back metal and made of the friction material composition of the present invention to be a friction surface (3) Configuration of (2) above In the structure, a primer layer for the purpose of surface modification for enhancing the adhesion effect of the back metal between the back metal and the friction member, a configuration in which an adhesive layer for the purpose of bonding the back metal and the friction member is further interposed, etc. Can be mentioned.
The backing metal is usually used as a friction member in order to improve the mechanical strength of the friction member. As the material, metal or fiber reinforced plastic can be used, for example, iron, stainless steel, inorganic fiber, etc. Examples include reinforced plastic and carbon fiber reinforced plastic. The primer layer and the adhesive layer may be those used for friction members such as brake shoes.
本実施形態の摩擦材組成物は、一般に使用されている方法を用いて摩擦材を製造することができ、本発明の摩擦材組成物を加熱加圧成形して製造することができる。詳細には、例えば、本実施形態の摩擦材組成物をレーディゲミキサー(「レーディゲ」は、登録商標。)、加圧ニーダー、アイリッヒミキサー(「アイリッヒ」は、登録商標。)等の混合機を用いて均一に混合し、この混合物を成形金型にて予備成形し、得られた予備成形物を成形温度130〜160℃、成形圧力20〜50MPa、成形時間2〜10分間の条件で成形し、得られた成形物を150〜250℃で2〜10時間熱処理することにより本実施形態の摩擦材を得ることができる。なお、必要に応じて塗装、スコーチ処理、研磨処理等を行ってもよい。 The friction material composition of this embodiment can manufacture a friction material using the method generally used, and can manufacture it by heat-press-molding the friction material composition of this invention. In detail, for example, the friction material composition of the present embodiment is mixed with a Laedige mixer (“Laedige” is a registered trademark), a pressure kneader, an Eirich mixer (“Eirich” is a registered trademark), or the like. The mixture is uniformly mixed using a machine, this mixture is preformed in a molding die, and the resulting preform is molded under conditions of a molding temperature of 130 to 160 ° C., a molding pressure of 20 to 50 MPa, and a molding time of 2 to 10 minutes. The friction material of this embodiment can be obtained by molding and heat-treating the resulting molded product at 150 to 250 ° C. for 2 to 10 hours. In addition, you may perform a coating, a scorch process, a grinding | polishing process, etc. as needed.
本実施形態の摩擦材組成物は、高温での耐摩耗性やメタルキャッチ抑制等に優れるため、ディスクブレーキパッドやブレーキライニング等の摩擦部材の「上張り材」として有用であり、さらに摩擦部材の「下張り材」として成形して用いることもできる。
なお、「上張り材」とは、摩擦部材の摩擦面となる摩擦材であり、「下張り材」とは、摩擦部材の摩擦面となる摩擦材と裏金との間に介在する、摩擦材と裏金との接着部付近の剪断強度、耐クラック性向上を目的とした層のことである。
Since the friction material composition of the present embodiment is excellent in wear resistance at high temperatures, metal catch suppression, etc., it is useful as a “upper material” for friction members such as disc brake pads and brake linings. It can also be molded and used as an “underlay material”.
The “upper material” is a friction material that becomes the friction surface of the friction member, and the “underlay material” is a friction material that is interposed between the friction material that becomes the friction surface of the friction member and the back metal. It is a layer for the purpose of improving the shear strength and crack resistance in the vicinity of the adhesion part with the back metal.
以下、実施例により本発明をさらに詳細に説明する。本発明は何らこれらに限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to these.
<実施例1〜7及び比較例1〜7>
[ディスクブレーキパッドの作製]
表1及び2に示す配合比率に従って材料を配合し、実施例1〜7及び比較例1〜7の摩擦材組成物を得た。なお、表1及び2の各成分の配合量の単位は、摩擦材組成物中の質量%である
<Examples 1-7 and Comparative Examples 1-7>
[Production of disc brake pads]
The materials were blended according to the blending ratios shown in Tables 1 and 2, and the friction material compositions of Examples 1 to 7 and Comparative Examples 1 to 7 were obtained. In addition, the unit of the compounding quantity of each component of Table 1 and 2 is the mass% in a friction material composition.
この摩擦材組成物をレーディゲミキサー(株式会社マツボー製、商品名:レーディゲミキサーM20)で混合し、この混合物を成形プレス(王子機械工業株式会社製)で予備成形し、得られた予備成形物を成形温度45℃、成形圧力35MPa、成形時間5分間の条件で成形プレス(三起精工株式会社製)を用いて、日立オートモティブシステムズ株式会社製の裏金(鉄製)と共に加熱加圧成形し、得られた成形品を200℃で4.5時間熱処理し、ロータリー研磨機を用いて研磨し、500℃のスコーチ処理を行って、ディスクブレーキパッド(摩擦材の厚さ9.5mm、摩擦材投影面積52cm2)を得た。 This friction material composition was mixed with a Laedige mixer (manufactured by Matsubo Co., Ltd., trade name: Ladige mixer M20), and this mixture was preformed with a molding press (manufactured by Oji Machinery Co., Ltd.), and obtained. The preform is heated and pressed with a backing metal (iron) manufactured by Hitachi Automotive Systems, Ltd. using a molding press (manufactured by Sanki Seiko Co., Ltd.) under conditions of a molding temperature of 45 ° C., a molding pressure of 35 MPa, and a molding time of 5 minutes. The molded product thus obtained was heat-treated at 200 ° C. for 4.5 hours, polished using a rotary polishing machine, subjected to scorch treatment at 500 ° C., and a disc brake pad (friction material thickness 9.5 mm, friction Material projection area 52 cm 2 ) was obtained.
なお、実施例及び比較例において使用した各種材料は次のとおりである。
(結合材)
・フェノール樹脂:日立化成株式会社製(商品名:HP491UP)
(有機充填材)
・カシューダスト
・SBR粉
(無機充填材)
・チタン酸カリウム
・硫酸バリウム
・黒鉛A:メジアン径=8.5μm
・黒鉛B:メジアン径=380.4μm
・三硫化アンチモン
・水酸化カルシウム
・酸化ジルコニウム:メジアン径=2.5μm
・酸化マグネシウム:メジアン径=3.5μm
(繊維基材)
・アラミド繊維(有機繊維)
・ウォラストナイト(無機繊維)
・銅繊維(金属繊維)
・鉄繊維(金属繊維)
(その他)
・鉄粉
The various materials used in the examples and comparative examples are as follows.
(Binder)
・ Phenolic resin: manufactured by Hitachi Chemical Co., Ltd. (trade name: HP491UP)
(Organic filler)
・ Cashew dust ・ SBR powder (inorganic filler)
-Potassium titanate-Barium sulfate-Graphite A: Median diameter = 8.5 μm
Graphite B: median diameter = 380.4 μm
-Antimony trisulfide-Calcium hydroxide-Zirconium oxide: Median diameter = 2.5 μm
Magnesium oxide: median diameter = 3.5 μm
(Fiber base)
・ Aramid fiber (organic fiber)
・ Wollastonite (inorganic fiber)
・ Copper fiber (metal fiber)
・ Iron fiber (metal fiber)
(Other)
・ Iron powder
前記の方法で作製した実施例1〜7及び比較例1〜7のディスクブレーキパッドを、ブレーキダイナモ試験機(新日本特機株式会社製)を用いて各種性能の評価を行った。実験には、一般的なピンスライド式のコレット型キャリパー及び株式会社キリウ製ベンチレーテッドディスクローター(FC250(ねずみ鋳鉄))を用い、日産自動車株式会社製、商品名:スカイラインV35の慣性モーメントで評価を行った。 Various performances of the disc brake pads of Examples 1 to 7 and Comparative Examples 1 to 7 produced by the above-described method were evaluated using a brake dynamo tester (manufactured by Nippon Steel Corporation). In the experiment, a general pin-slide collet caliper and a ventilated disc rotor (FC250 (gray cast iron)) manufactured by Kiriu Co., Ltd. were used. Went.
(効き特性の評価)
試験は自動車技術会規格JASO C406に準拠し、第2効力試験における摩擦係数の平均値を算出し、効き特性として評価した。
(Evaluation of efficacy characteristics)
The test was based on the Japan Society of Automotive Engineers standard JASO C406, and the average value of the coefficient of friction in the second efficacy test was calculated and evaluated as efficacy characteristics.
(耐摩耗性の評価)
試験はJASO C427に準拠し、制動前ブレーキ温度が100、200、300、400℃におけるディスクパッドの摩耗量をそれぞれ計測し、耐摩耗性として評価した。
(Evaluation of wear resistance)
The test was based on JASO C427, and the amount of wear of the disk pad at brake temperatures before braking of 100, 200, 300, and 400 ° C. was measured and evaluated as wear resistance.
(BTV特性の評価)
まず、初速度60km/h、終速度0km/h、減速度0.3G、制動開始時のディスクロータ温度130℃で200回のすり合わせを行った。続いて本測定として、初速度160km/h、終速度60km/h、減速度0.3G、制動開始時のディスクロータ温度400℃の条件で制動を3回実施し、発生したトルク振動の最大値をBTV特性として評価した。
(Evaluation of BTV characteristics)
First, 200 times of rubs were performed at an initial speed of 60 km / h, an end speed of 0 km / h, a deceleration of 0.3 G, and a disk rotor temperature of 130 ° C. at the start of braking. Subsequently, for this measurement, braking was performed three times under the conditions of an initial speed of 160 km / h, an end speed of 60 km / h, a deceleration of 0.3 G, and a disk rotor temperature of 400 ° C. at the start of braking. Were evaluated as BTV characteristics.
(比重の評価)
試験は日本工業規格JIS D4417に準拠した。作製したディスクブレーキパッドを破断して裏金を取り除き、接着層等の摩擦部材以外の要素を有する場合は研磨等によって取り除くことで得られた摩擦部材を価に使用した。比重が2.25未満であればA評価、2.25以上2.30未満であればB評価、2.30以上であればC評価とした。
(Evaluation of specific gravity)
The test was based on Japanese Industrial Standard JIS D4417. The manufactured disc brake pad was broken to remove the back metal, and when it had elements other than the friction member such as an adhesive layer, the friction member obtained by removing it by polishing or the like was used for the value. If the specific gravity was less than 2.25, it was rated as A, and if it was 2.25 or more and less than 2.30, it was rated as B, and if it was 2.30 or more, it was rated as C.
実施例1〜6は、鉄繊維を含有しない比較例1、鉄繊維の含有率が3質量%を超える比較例2、ウォラストナイトの含有率が10質量%未満である比較例3、酸化マグネシウムの含有率が10質量%以上であると共に黒鉛のメジアン径が30μm以上である比較例4、カシューダストの含有率が2質量%未満である比較例5、黒鉛と酸化マグネシウムの含有率が共に10質量%を超える比較例6と比較して、効き特性、耐摩耗性、BTV特性がバランス良く改善されていることは明らかである。また、BTV評価時におけるディスクロータのサーモグラフィ画像を図1に示す。実施例1は比較例1に対して温度勾配が均一で、安定した摩擦特性を発現した。さらに、摩擦特性は比較的良好であるが銅の含有率が0.5質量%以上であると共に、比重の大きな酸化ジルコニウムを研削材として含有する比較例7に対して比重が小さく、自動車の燃費改善に寄与できる。 Examples 1 to 6 are Comparative Example 1 containing no iron fiber, Comparative Example 2 in which the content of iron fiber exceeds 3% by mass, Comparative Example 3 in which the content of wollastonite is less than 10% by mass, magnesium oxide Comparative Example 4 in which the content ratio of graphite is 10% by mass or more and the median diameter of graphite is 30 μm or more, Comparative Example 5 in which the content ratio of cashew dust is less than 2% by mass, It is clear that the efficacy characteristics, wear resistance, and BTV characteristics are improved in a well-balanced manner as compared with Comparative Example 6 exceeding mass%. Further, a thermographic image of the disk rotor at the time of BTV evaluation is shown in FIG. In Example 1, the temperature gradient was uniform compared to Comparative Example 1, and stable friction characteristics were expressed. Furthermore, although the friction characteristics are relatively good, the copper content is 0.5 mass% or more, and the specific gravity is smaller than that of Comparative Example 7 containing zirconium oxide having a large specific gravity as an abrasive, and the fuel consumption of the automobile It can contribute to improvement.
本発明のノンアスベスト摩擦材組成物、これを用いた摩擦材及び摩擦部材は、従来品と比較して制動時に生成する摩耗粉中の銅が少ないことから環境に優しく、かつ良好な効き特性、耐摩耗性、BTV特性を有し、さらに軽量であることから自動車等の燃費向上にも貢献するため、乗用車用ブレーキパッド等の摩擦材及び摩擦部材に好適である。 The non-asbestos friction material composition of the present invention, the friction material using the friction material, and the friction member are environmentally friendly and have good effect characteristics because there is less copper in the wear powder generated during braking compared to conventional products, It is suitable for friction materials and friction members such as brake pads for passenger cars because it has wear resistance and BTV characteristics, and further contributes to improving fuel consumption of automobiles and the like.
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JP6535543B2 (en) * | 2015-08-06 | 2019-06-26 | 日立オートモティブシステムズ株式会社 | Brake friction material |
JP2017141351A (en) * | 2016-02-10 | 2017-08-17 | 日立化成株式会社 | Friction material composition, friction material and friction member using the friction material composition |
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JPS5466951A (en) * | 1977-10-21 | 1979-05-29 | Sumitomo Electric Ind Ltd | Friction damping material |
JPS5616578A (en) * | 1979-07-23 | 1981-02-17 | Nisshinbo Ind Inc | Friction material |
JPS58213078A (en) * | 1982-06-04 | 1983-12-10 | Hitachi Chem Co Ltd | Friction material composition |
JPH02300531A (en) * | 1989-05-12 | 1990-12-12 | Nisshinbo Ind Inc | Non-asbestos group friction material |
JP3228096B2 (en) * | 1995-10-18 | 2001-11-12 | トヨタ自動車株式会社 | Manufacturing method of friction material |
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US9441693B2 (en) * | 2010-11-19 | 2016-09-13 | Hitachi Chemical Company, Ltd. | Non-asbestos friction material composition, and friction material and friction member using same |
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