JP6072494B2 - Friction material and brake pad using the same - Google Patents
Friction material and brake pad using the same Download PDFInfo
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本発明は、二輪車又は四輪自動車などのディスクブレーキに使用される摩擦材及びそれを用いたブレーキパッドに関する。 The present invention relates to a friction material used for a disc brake of a two-wheeled vehicle or a four-wheeled vehicle, and a brake pad using the friction material.
古くは、ディスクブレーキのブレーキパッドの摩擦材として石綿繊維を使用していたが、近年、石綿繊維の有害性が指摘され、石綿繊維に代わる代替繊維としてスチールファイバーなどのような金属繊維を主成分とした、いわゆるセミメタリック系摩擦材（例えば、特許文献１等参照）や、繊維基材としてスチール繊維を用いない、または用いてもその配合量が少ない、アラミド繊維等の耐熱性有機繊維、ガラス繊維、チタン酸カリウム繊維またはウィスカ等の無機繊維、銅繊維、黄銅繊維等の非鉄金属繊維を複数種組み合わせて用いた、いわゆる非スチール系摩擦材（例えば、特許文献２、３等参照）が用いられるようになっている。 In the old days, asbestos fiber was used as a friction material for brake pads of disc brakes, but recently, the harmfulness of asbestos fibers has been pointed out, and metal fibers such as steel fibers are the main component as an alternative to asbestos fibers. Heat-resistant organic fibers such as aramid fibers, glass, so-called semi-metallic friction materials (see, for example, Patent Document 1), steel fibers are not used as a fiber base material, or even if used, the blending amount is small. A so-called non-steel friction material (for example, see Patent Documents 2 and 3, etc.) using a combination of a plurality of types of non-ferrous metal fibers such as fibers, potassium titanate fibers or whisker inorganic fibers, copper fibers, and brass fibers is used. It is supposed to be.
しかし、セミメタリック系摩擦材や非スチール系摩擦材は、熱伝導率が従来の石綿繊維より高いため、ブレーキング時に発生する摩擦熱がブレーキオイル側に伝わる割合が多くなり、いわゆるベーパロック現象が起き易く、かつ摩擦材と裏板を接着している接着剤の劣化を促進し、摩擦材とバックプレートとの接着が剥がれる虞がある。このため最近は、ディスクブレーキパッドを構成する摩擦材を上張り材とし、上張り材とバックプレートとの間に熱伝導率が摩擦部材より低い下張り材を挟むことが提案されている。 However, semi-metallic friction materials and non-steel friction materials have a higher thermal conductivity than conventional asbestos fibers, so the rate at which frictional heat generated during braking is transmitted to the brake oil increases and the so-called vapor lock phenomenon occurs. It is easy to promote deterioration of the adhesive that bonds the friction material and the back plate, and there is a possibility that the adhesion between the friction material and the back plate may be peeled off. For this reason, recently, it has been proposed to use a friction material constituting the disc brake pad as an upper material, and to sandwich a lower material whose thermal conductivity is lower than that of the friction material between the upper material and the back plate.
従来の下張り材では、一定の断熱作用を得るため、樹脂材等の低熱伝導率の素材を使用し、下張り材の熱伝導率を１Ｗ／ｍ・Ｋ程度としている。また、下張り材として一定の強度を得ること、剥離防止、耐クラック性を確保するために、アラミド繊維、セラミック繊維等の補強繊維と樹脂材の分量を多くし、また、耐食性を確保するため高ｐＨ素材や、ｐＨ調整材を使用することが行われている。 In order to obtain a certain heat insulating effect in the conventional underlay material, a material having a low thermal conductivity such as a resin material is used, and the heat conductivity of the undercoat material is set to about 1 W / m · K. In order to obtain a certain level of strength as an underlaying material, to prevent peeling, and to ensure crack resistance, the amount of reinforcing fibers such as aramid fibers and ceramic fibers and resin materials is increased, and high resistance is required to ensure corrosion resistance. The use of a pH material or a pH adjusting material has been performed.
ディスクブレーキパッドは、摩耗により摩擦材が一定以上消耗すると交換する必要があるが、この交換頻度を低くするために、耐摩耗性の高い摩擦材が求められている。
本発明者らは、有機結合材、金属、黒鉛と摩擦調整剤を含む上張り材を用いることにより、高い耐摩耗性が得られることを見出した。しかしながら、この上張り材と従来のディスクブレーキパッドに用いられる下張り材を組み合わせて使用すると、以下に示す問題が発生することが判明した。
The disc brake pad needs to be replaced when the friction material is consumed more than a certain amount due to wear. However, in order to reduce the frequency of replacement, a friction material having high wear resistance is required.
The present inventors have found that high wear resistance can be obtained by using an upper binder containing an organic binder, metal, graphite and a friction modifier. However, it has been found that the following problems occur when this upper material and a lower material used in a conventional disc brake pad are used in combination.
従来のディスクブレーキパッドに用いられる下張り材は、断熱作用を重視して熱伝導率を１Ｗ／ｍ・Ｋ程度として形成されており、制動時のディスクとの摩擦によって生じた熱が上張り材からバックプレート側に放散されにくいことから上張り材の内部に熱がこもるようになり、上張り材が高温になり易い。
上張り材の耐摩耗性を向上させることで、摩耗による消耗が少なくなり、長寿命化が可能になるが、長寿命化すなわち制動回数の増加に伴い、制動時の摩擦熱により高温になる回数が従来よりも増加することになる。この熱履歴が与えられる回数の増加により、上張り材の交換を要する程度まで摩耗が進行するよりも前に、熱の影響で摩擦材にクラックが発生する等の問題が生じた。
The underlay material used in conventional disc brake pads is formed with a thermal conductivity of about 1 W / m · K with an emphasis on heat insulation, and heat generated by friction with the disc during braking is generated from the upholstery material. Since it is difficult to dissipate to the back plate side, heat is trapped inside the upper material, and the upper material tends to be hot.
By improving the wear resistance of the upper material, wear due to wear is reduced and the service life can be extended. However, the number of times the temperature increases due to frictional heat during braking as the service life increases, that is, the number of times of braking increases. Will increase more than before. Due to the increase in the number of times that the thermal history is given, problems such as the occurrence of cracks in the friction material due to the influence of heat occurred before the abrasion progresses to the extent that the replacement of the upper material is required.
本発明は、かかる事情に鑑みてなされたものであり、耐摩耗性と耐熱（耐クラック）性を兼ね備えた摩擦材及びそれを用いたディスクブレーキパッドを提供することを目的とする。 The present invention has been made in view of such circumstances, and an object thereof is to provide a friction material having both wear resistance and heat resistance (crack resistance), and a disc brake pad using the friction material.
本発明は、有機結合材、金属、黒鉛と摩擦調整剤を含む上張り材と、従来の下張り材よりも高い熱伝導率を有する下張り材とを組み合わせて用いることにより、上記課題を解決する摩擦材を提供するものである。
The present invention provides a friction that solves the above problems by using a combination of an organic binder, a metal, graphite and a liner containing a friction modifier, and a liner having a higher thermal conductivity than a conventional liner. The material is provided .
すなわち、本発明は、以下の通りである。
（１）繊維状物質、有機結合材、金属、黒鉛と摩擦調整剤を含む上張り材と、下張り材とを備え、前記上張り材は、銅を含有し、銅含有量が、上張り材全体を１００体積％として、２０〜４０体積％であるとともに、２５℃における熱伝導率が４〜６Ｗ／ｍ・Ｋであり、前記下張り材は、銅を含有し、銅含有量が、下張り材全体を１００体積％として、５〜２０体積％であるとともに、２５℃における熱伝導率が１．５〜３Ｗ／ｍ・Ｋである摩擦材。
（２）上張り材中に、平均粒径（Ｄ５０）０．５〜３ｍｍの黒鉛を、上張り材全体を１００体積％として１５〜３５体積％含み、下張り材中に、平均粒径（Ｄ５０）０．５〜３ｍｍの黒鉛を、下張り材全体を１００体積％として５〜２０体積％含む（１）に記載の摩擦材。
（３）（１）又は（２）に記載の摩擦材と、バックプレートとが積層され、一体に固着されてなるディスクブレーキパッド。
That is, the present invention is as follows.
(1) A fibrous material, an organic binder, a metal, graphite, a top material containing a friction modifier, and a bottom material. The top material contains copper, and the copper content is the top material. the overall 100% by volume, with 20 to 40 vol%, the thermal conductivity of 4~6W / m · K at 25 ° C., the underlayer material may contain copper, copper content, underlayer material A friction material having a total volume of 100% by volume and 5 to 20% by volume, and a thermal conductivity at 25 ° C. of 1.5 to 3 W / m · K.
(2) in overlay material, the graphite planar Hitoshitsubu径(D50) 0.5 to 3 mm, see 15-35% by volume containing the entire upholstery material as 100% by volume, in underlayer material, the average particle size (D50) the graphite 0.5 to 3 mm, the friction material according to 5-20 vol% including (1) the entire underlayer material 100 vol%.
(3) A disc brake pad in which the friction material according to (1) or (2) and a back plate are laminated and fixed together.
本発明によれば、耐摩耗性と耐熱（耐クラック）性を兼ね備えた長寿命の摩擦材及びそれを用いたディスクブレーキパッドを得ることができる。 According to the present invention, a long-life friction material having both wear resistance and heat resistance (crack resistance) and a disc brake pad using the friction material can be obtained.
本発明の摩擦材の上張り材としては、繊維状物質、有機結合材、金属、黒鉛と摩擦調整剤を含み、熱伝導率が４〜６Ｗ／ｍ・Ｋであるものを用いる。 As the upper material of the friction material of the present invention, a material containing a fibrous substance, an organic binder, metal, graphite and a friction modifier and having a thermal conductivity of 4 to 6 W / m · K is used.
本発明の摩擦材の上張り材に含まれる繊維状物質としては、スチール繊維、銅繊維、黄銅繊維等の金属繊維、アラミド繊維、アクリル繊維、セルロース繊維、炭素繊維、ポリイミド繊維、フェノール繊維等の有機繊維、セラミック繊維、ガラス繊維等の無機繊維等を用いることができる。これらは、耐摩耗性向上、破壊強度向上の観点から、２種類以上を併用してもよい。また、繊維状物質の含有量は、上張り材全体を１００体積％として、２〜１０体積％とすることが好ましい。 As the fibrous material contained in the friction material of the present invention, metal fibers such as steel fibers, copper fibers, brass fibers, aramid fibers, acrylic fibers, cellulose fibers, carbon fibers, polyimide fibers, phenol fibers, etc. Inorganic fibers such as organic fibers, ceramic fibers, and glass fibers can be used. Two or more of these may be used in combination from the viewpoint of improving wear resistance and breaking strength. Moreover, it is preferable that content of a fibrous substance shall be 2-10 volume% by making the whole upper material into 100 volume%.
本発明の摩擦材の上張り材に含まれる有機結合材としては、フェノール樹脂、ＮＢＲゴム、ＳＢＲゴム、天然ゴム等を用いることができる。 As the organic binder contained in the upper material of the friction material of the present invention, phenol resin, NBR rubber, SBR rubber, natural rubber, or the like can be used.
本発明の摩擦材の上張り材に含まれる金属としては、銅、黄銅、亜鉛等を用いることができ、中でも高温時の摩擦係数安定化の観点で銅を用いることが好ましい。また、金属の含有量は、上張り材全体を１００体積％として、２０〜４０体積％とすることが好ましい。 As the metal contained in the upper material of the friction material of the present invention, copper, brass, zinc, or the like can be used. Among these, copper is preferably used from the viewpoint of stabilizing the friction coefficient at high temperatures. Moreover, it is preferable that metal content shall be 20-40 volume% by making the whole upper material into 100 volume%.
本発明の摩擦材の上張り材に含まれる黒鉛は、潤滑剤として作用し、平均粒径（Ｄ５０）０．５〜３ｍｍの黒鉛を含むことが好ましい。ここで、本発明中、平均粒径とはＪＩＳ Ｍ ８５１１に規定されるふるいわけ法によって求めた粒度分布における質量平均値Ｄ５０（累積質量が全質量の５０％になるときの粒子径）を意味する。また、黒鉛の含有量は、上張り材全体を１００体積％として、１５〜３５体積％とすることが好ましい。 The graphite contained in the friction material of the present invention preferably acts as a lubricant and contains graphite having an average particle diameter (D50) of 0.5 to 3 mm. Here, in the present invention, the average particle diameter means a mass average value D50 (particle diameter when the cumulative mass is 50% of the total mass) in the particle size distribution determined by the sieving method defined in JIS M 8511. To do. Moreover, it is preferable that content of graphite shall be 15-35 volume% by making the whole upper material into 100 volume%.
本発明の摩擦材の上張り材に含まれる摩擦調整剤としては、硫酸バリウム、炭酸カルシウム、炭酸マグネシウム等の無機充填剤、カシューダスト、ゴム粉などの有機充填剤等を用いることができる。また、摩擦調整剤の含有量は、上張り材全体を１００体積％として、２０〜４０体積％とすることが好ましい。 As the friction modifier contained in the upper material of the friction material of the present invention, inorganic fillers such as barium sulfate, calcium carbonate and magnesium carbonate, organic fillers such as cashew dust and rubber powder, and the like can be used. In addition, the content of the friction modifier is preferably 20 to 40% by volume with the entire upper material being 100% by volume.
本発明の摩擦材は、上張り材が上記のように構成されることにより、制動力、低い相手攻撃性や鳴き等の特性に優れると同時に、高い耐摩耗性を有する。 The friction material of the present invention is excellent in characteristics such as braking force, low opponent attack, squealing, and the like, and at the same time has high wear resistance because the upper material is configured as described above.
また、下張り材としては、摩耗して上張り材の部分がなくなり、下張り材部分のみとなっても摩擦係数や摩耗特性が大きく変化しないようにしなくてはならないため、上張り材と類似した材料を用い、断熱性の観点から、熱伝導率の大きい材料を減らすか又は熱伝導率の小さな材料を増やしたりしたものを用いる。 In addition, the material used for the underlayment is similar to that used for the upholstery because it is necessary to ensure that the friction coefficient and wear characteristics do not change significantly even if only the underlayment portion is removed due to wear. From the viewpoint of heat insulation, a material having a high thermal conductivity is reduced or a material having a low thermal conductivity is increased.
本発明の摩擦材の下張り材に含まれる繊維状物質としては、スチール繊維、銅繊維、黄銅繊維等の金属繊維、アラミド繊維、アクリル繊維、セルロース繊維、炭素繊維、ポリイミド繊維、フェノール繊維等の有機繊維、セラミック繊維、ガラス繊維、ロックウール等の無機繊維等を用いることができる。これらは、耐摩耗性向上、破壊強度向上の観点から、２種類以上を併用することが好ましい。また、繊維状物質の含有量は、下張り材全体を１００体積％として、２０〜４０体積％とすることが好ましい。 The fibrous material contained in the friction material of the present invention includes metal fibers such as steel fibers, copper fibers and brass fibers, aramid fibers, acrylic fibers, cellulose fibers, carbon fibers, polyimide fibers, and organic fibers such as phenol fibers. Inorganic fibers such as fibers, ceramic fibers, glass fibers, and rock wool can be used. These are preferably used in combination of two or more from the viewpoint of improving wear resistance and breaking strength. Moreover, it is preferable that content of a fibrous substance shall be 20-40 volume% by making the whole underlining material 100 volume%.
本発明の摩擦材の下張り材に含まれる有機結合材としては、フェノール樹脂、ＮＢＲゴム、ＳＢＲゴム、天然ゴム等を用いることができる。 As the organic binder contained in the friction material of the present invention, phenol resin, NBR rubber, SBR rubber, natural rubber, or the like can be used.
本発明の摩擦材の下張り材に含まれる金属としては、銅、黄銅、亜鉛等を用いることができ、中でも従来の下張り材よりも熱伝導率を高くする観点で銅を用いることが好ましい。また、金属の含有量は、下張り材全体を１００体積％として、５〜２０体積％とすることが好ましい。 As the metal contained in the friction material of the present invention, copper, brass, zinc or the like can be used, and copper is preferably used from the viewpoint of increasing the thermal conductivity of the conventional material. Moreover, it is preferable that metal content shall be 5-20 volume% by making the whole base material into 100 volume%.
本発明の摩擦材の下張り材に含まれる黒鉛は、潤滑剤として作用し、平均粒径（Ｄ５０）０．５〜３ｍｍの黒鉛を含むことが好ましい。また、黒鉛の含有量は、下張り材全体を１００体積％として、黒鉛全体で１〜１０体積％とすることが好ましい。 The graphite contained in the base material of the friction material of the present invention preferably acts as a lubricant and contains graphite having an average particle diameter (D50) of 0.5 to 3 mm. Moreover, it is preferable that content of graphite shall be 1-10 volume% with respect to the whole graphite, making the whole underlay material 100 volume%.
本発明の摩擦材の下張り材に含まれる摩擦調整剤としては、硫酸バリウム、炭酸カルシウム、炭酸マグネシウム等の無機充填剤、カシューダスト、ゴム粉などの有機充填剤等を用いることができる。また、摩擦調整剤の含有量は、下張り材全体を１００体積％として、２０〜４０体積％とすることが好ましい。 As the friction modifier contained in the undercoat material of the friction material of the present invention, inorganic fillers such as barium sulfate, calcium carbonate and magnesium carbonate, organic fillers such as cashew dust and rubber powder, and the like can be used. In addition, the content of the friction modifier is preferably 20 to 40% by volume, with the entire undercoat being 100% by volume.
本発明の摩擦材の上張り材の熱伝導率は４〜６Ｗ／ｍ・Ｋとし、下張り材の熱伝導率は１．５〜３Ｗ／ｍ・Ｋとなるように調整する。なお、本発明における熱伝導率は、ＪＩＳ Ｒ ２６１６に準拠して、熱線法により測定した２５℃における値である。下張り材の熱伝導率を従来の下張り材の熱伝導率（１Ｗ／ｍ・Ｋ程度）よりも高くすることにより、制動時のディスクとの摩擦によって生じた熱が上張り材からバックプレート側に放散されやすくなり、摩擦材の過熱が起こりにくくなる。このことにより、高い耐摩耗性を有する本発明の上張り材の交換を要する程度まで摩耗が進行するよりも前に、熱の影響で摩擦材にクラックが発生することを防止でき、長寿命のディスクブレーキパッドを得ることが可能となる。 The thermal conductivity of the upper material of the friction material of the present invention is adjusted to 4 to 6 W / m · K, and the thermal conductivity of the lower material is adjusted to 1.5 to 3 W / m · K. In addition, the thermal conductivity in this invention is a value in 25 degreeC measured by the hot wire method based on JISR2616. By making the thermal conductivity of the underlayer higher than that of the conventional underlayer (about 1 W / m · K), the heat generated by friction with the disk during braking is transferred from the upper layer to the back plate. It becomes easy to dissipate and the friction material is less likely to overheat. As a result, it is possible to prevent the friction material from cracking due to the effect of heat before the wear progresses to the extent that the replacement of the overlay material of the present invention having high wear resistance is required, and to have a long service life. A disc brake pad can be obtained.
ディスクブレーキパッドを製造する際は、例えば、各素材を秤量・撹拌混合したコンパウンドを、予め接着剤を塗布したバックプレートと共に１４０〜１７０℃に加熱された金型に投入して加熱・加圧成形し、その後、熱処理により有機結合材を硬化させる方法で製造することができる。 When manufacturing a disc brake pad, for example, a compound in which each material is weighed and stirred and mixed is put into a mold heated to 140 to 170 ° C. together with a back plate pre-applied with an adhesive, and then heated and pressed. Then, it can be manufactured by a method of curing the organic binder by heat treatment.
以下、本発明を実施例に基づいて詳細に説明するが、本発明はこれに限定されるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to this.
表１に示す配合を用いてディスクブレーキパッドを作製した。表中、上張り材の配合が、Ａ−１〜Ａ−２であり、下張り材の配合が、Ｂ−１〜Ｂ−３である。各配合物をレディゲミキサーで充分に混合後、予備成形機を用いて、表２に示す組み合わせで、２層の予備成形体に成形した。得られた予備成形体を、予め接着剤を塗布したバックプレートをセットした金型に投入し、成形温度：１６０℃、成形圧力：６０ＭＰａ、成形時間：５分の加熱・加圧成形を行い、その後取り出した加熱成形体を硬化炉に入れ、２３５℃で４時間硬化し、実施例１、２及び比較例１〜４のブレーキパッドを作製した。
Disc brake pads were prepared using the formulations shown in Table 1. In the table, the composition of the upper material is A-1 to A-2, and the composition of the lower material is B-1 to B-3. Each mixture was sufficiently mixed with a Redige mixer, and then molded into a two-layer preform using the preforming machine in the combinations shown in Table 2. The obtained preform is put into a mold in which a back plate pre-applied with an adhesive is set, and a molding temperature: 160 ° C., a molding pressure: 60 MPa, a molding time: 5 minutes of heating and pressure molding, Thereafter, the thermoformed body taken out was placed in a curing furnace and cured at 235 ° C. for 4 hours to prepare brake pads of Examples 1 and 2 and Comparative Examples 1 to 4.
［摩耗量の評価］
二輪自動車ブレーキ装置ダイナモメーターにて、パッド面積：２０ｃｍ２、ディスク径：３００ｍｍ、イナーシャ：１９．６ｋｇ・ｍ２、車速：１３０→０ｋｍ／ｈ、減速度：３．０ｍ／ｓ２、ブレーキイン温度：２５０℃（パッド温度）にて１００回制動した後の摩耗量を測定し、１０００回相当に換算した数値を摩耗量として評価した。
[Evaluation of wear amount]
With a two-wheeled vehicle brake device dynamometer, pad area: 20 cm 2 , disk diameter: 300 mm, inertia: 19.6 kg · m 2 , vehicle speed: 130 → 0 km / h, deceleration: 3.0 m / s 2 , brake-in temperature : The amount of wear after braking 100 times at 250 ° C. (pad temperature) was measured, and a numerical value converted to 1000 times was evaluated as the amount of wear.
［クラックの評価］
二輪自動車ブレーキ装置ダイナモメーターにて、パッド面積：２０ｃｍ２、ディスク径：３１０ｍｍ、イナーシャ：３６．８ｋｇ・ｍ２、車速：１３０→０ｋｍ／ｈ、減速度：３．０ｍ／ｓ２、ブレーキイン温度：３５０℃（パッド温度）にて２００回制動した後のパッド側面のクラック発生の有無について評価した。
[Evaluation of cracks]
With a motorcycle dynamometer, pad area: 20 cm 2 , disk diameter: 310 mm, inertia: 36.8 kg · m 2 , vehicle speed: 130 → 0 km / h, deceleration: 3.0 m / s 2 , brake-in temperature : The presence or absence of cracks on the side surface of the pad after braking 200 times at 350 ° C. (pad temperature) was evaluated.
［熱伝導率の測定］
熱伝導率の測定については熱線法を用い、測定器としては京都電子工業株式会社製の商品名：Ｋｅｍｔｈｅｒｍ ＱＴＭ−Ｄ３を使用し、２５℃における熱伝導率を測定した。
[Measurement of thermal conductivity]
About the measurement of heat conductivity, the heat ray method was used, and the product name: Chemtherm QTM-D3 by Kyoto Electronics Co., Ltd. was used as a measuring device, and the heat conductivity at 25 ° C. was measured.
上記の評価の結果を表２に示す。 The results of the above evaluation are shown in Table 2.
実施例１、実施例２とも摩耗量が少なくクラックの発生が無かったのに対し、比較例１ではクラックが発生し、比較例２、比較例３では摩耗量が多い結果となった。上記の評価結果より、本発明の摩擦材によれば、意図した熱伝導度の上張り材と下張り材の組合せにより、耐摩耗性と耐熱（耐クラック）性を兼ね備えた摩擦材及びそれを用いたディスクブレーキパッドを提供できることが確認された。 In both Examples 1 and 2, the amount of wear was small and cracks were not generated, whereas in Comparative Example 1, cracks were generated, and in Comparative Examples 2 and 3, the amount of wear was large. From the above evaluation results, according to the friction material of the present invention, the friction material having both wear resistance and heat resistance (crack resistance) and the use of the combination of the upper material and the lower material with the intended thermal conductivity are used. It was confirmed that it was possible to provide the existing disc brake pads.
Claims (3)
前記上張り材は、銅を含有し、銅含有量が、上張り材全体を１００体積％として、２０〜４０体積％であるとともに、２５℃における熱伝導率が４〜６Ｗ／ｍ・Ｋであり、
前記下張り材は、銅を含有し、銅含有量が、下張り材全体を１００体積％として、５〜２０体積％であるとともに、２５℃における熱伝導率が１．５〜３Ｗ／ｍ・Ｋである摩擦材。 A fibrous material, an organic binder, a metal, graphite and a top material containing a friction modifier, and a bottom material ,
The said upper material contains copper, and copper content is 20-40 volume% by making the whole upper material into 100 volume%, and thermal conductivity in 25 degreeC is 4-6 W / m * K. Yes,
The undercoat contains copper, and the copper content is 5 to 20% by volume, with the entire undercoat being 100% by volume, and the thermal conductivity at 25 ° C. is 1.5 to 3 W / m · K. A friction material.
下張り材中に、平均粒径（Ｄ５０）０．５〜３ｍｍの黒鉛を、下張り材全体を１００体積％として５〜２０体積％含む請求項１に記載の摩擦材。 During overlay material, the graphite planar Hitoshitsubu径(D50) 0.5 to 3 mm, 15 to 35 vol% seen contains the entire upholstery material as 100% by volume,
During underlayer material, the graphite having an average particle diameter (D50) 0.5 to 3 mm, the friction material according to 5-20 vol% including claim 1 the entire underlayer material 100 vol%.
A brake pad formed by laminating the friction material according to claim 1 and a back plate and fixing them together.
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