JPH0615891B2 - Brake friction material - Google Patents
Brake friction materialInfo
- Publication number
- JPH0615891B2 JPH0615891B2 JP61194927A JP19492786A JPH0615891B2 JP H0615891 B2 JPH0615891 B2 JP H0615891B2 JP 61194927 A JP61194927 A JP 61194927A JP 19492786 A JP19492786 A JP 19492786A JP H0615891 B2 JPH0615891 B2 JP H0615891B2
- Authority
- JP
- Japan
- Prior art keywords
- ratio
- friction coefficient
- brake
- friction material
- pad
- 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.)
- Expired - Lifetime
Links
- 239000002783 friction material Substances 0.000 title claims description 16
- 239000000835 fiber Substances 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 230000003068 static effect Effects 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 13
- 238000013329 compounding Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000005011 phenolic resin Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 description 9
- 230000001133 acceleration Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012784 inorganic fiber Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000010425 asbestos Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- -1 barium sulfate Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、自動車用のブレーキ摩擦材に係り、特にブレ
ーキの鳴き防止効果に優れたブレーキ摩擦材に関する。Description: TECHNICAL FIELD The present invention relates to a brake friction material for automobiles, and more particularly to a brake friction material having an excellent brake squeal prevention effect.
一般に、自動車用のブレーキ摩擦材には短繊維状の石綿
を結合剤に用いて加熱、加圧、成形したレジン・モール
ドが用いられてきたが、自動車の高速化に伴う制動性の
向上、耐フェード性、耐摩耗性等の請求及び石綿による
環境汚染の問題から、今日ではいわゆるセミ・メタリッ
クがブレーキ摩擦材として広く用いられている。Generally, as a brake friction material for automobiles, a resin mold has been used in which short fibrous asbestos is used as a binder to heat, pressurize, and mold. So-called semi-metallic materials are widely used today as brake friction materials due to the problems of fade resistance, wear resistance, etc. and environmental pollution caused by asbestos.
セミ・メタリックは繊維状鋼材を主成分とし、これに充
填剤として黒鉛、硫酸バリウム等を加え、結合剤にフェ
ノール樹脂を用いて加熱成形したもので、耐フェード
性、耐摩耗性に優れており、又、環境汚染の恐れがない
という長所を有している。Semi-metallic is a fibrous steel material as a main component, graphite, barium sulfate, etc. are added as a filler to this, and a phenol resin is used as a binder for heat molding, and it has excellent fade resistance and wear resistance. In addition, it has an advantage that there is no fear of environmental pollution.
従来技術のセミ・メタリックからなるブレーキ摩擦材は
幾多の長所を有する反面、次の欠点を有している。即
ち、例えば自動車が制御を加えながら低速で降板する場
合、或いは自動変速機付自動車がブレーキ停止状態から
発進する場合等のように、比較的低速の状態で制動を加
えたとき、低周波ノイズあるいわゆる“グー音”という
ブレーキ鳴き現象が生じることである。このブレーキ鳴
き現象は、例えばディスクブレーキにあってはディスク
に圧接するパッドの摩擦摺動面に摩擦振動が発生し、こ
の摩擦振動が該パッドを支持しているシム、ピストン、
キャリパ等の部品、さらにはボデーと共振することによ
り発生することが知られている。このように、ブレーキ
鳴き現象はパッド及び関連部品による複雑な振動系によ
って発生しており、その原因の解明も十分ではないが、
パッドの静摩擦係数μｓと動摩擦係数μｍの差が大きい
ときにディスク面に対して生じる該パッドの食い付き、
滑りの繰返し現象（以下、スティックスリップ現象とい
う）が原因といわれている。Although the conventional brake friction material made of semi-metallic has many advantages, it has the following drawbacks. That is, when braking is applied at a relatively low speed state, such as when the vehicle descends at a low speed while applying control, or when an automobile with an automatic transmission starts from a brake stopped state, there is low frequency noise. A so-called "guo noise" squeal of the brake occurs. In the brake squealing phenomenon, for example, in a disc brake, frictional vibration is generated on a frictional sliding surface of a pad that is in pressure contact with the disc, and the frictional vibration causes a shim, a piston, or a shim supporting the pad.
It is known to be generated by resonating with components such as calipers and further with the body. In this way, the brake squeal phenomenon is caused by the complicated vibration system of the pad and related parts, and the cause is not fully understood,
When the difference between the static friction coefficient μs and the dynamic friction coefficient μm of the pad is large, the biting of the pad against the disk surface,
It is said that the repeated slip phenomenon (hereinafter referred to as stick-slip phenomenon) is the cause.
而して、前述したレジン・モールドからなるブレーキ摩
擦材では“グー音”の発生が少なかったのに対し、セミ
・メタリックのブレーキ摩擦材は特に“グー音”の発生
率が高く、静摩擦係数μｓと動摩擦係数μｍの差の大き
いことが欠点となっている。Thus, while the brake friction material made of the resin mold described above produced less "goo noise", the semi-metallic brake friction material had a particularly high "goo noise" occurrence rate and a static friction coefficient μs. And the dynamic friction coefficient μm is large.
本願発明者は前述した従来技術の欠点に鑑み、かつセミ
・メタリック製ブレーキ摩擦材において静摩擦係数μｓ
と動摩擦係数μｍの差の大きいのは主成分である繊維状
鋼材とその含有量に起因することに着目して本発明をな
したもので、本発明が解決しようとする問題点は、自動
車の低速制動時において“グー音”のブレーキ鳴き現象
が発生しないようにしたブレーキ摩擦材を提供すること
にある。In view of the above-mentioned drawbacks of the prior art, the inventor of the present application has taken into consideration the static friction coefficient μs in the semi-metallic brake friction material.
The present invention has been made focusing on the fact that the difference in the dynamic friction coefficient μm is due to the fibrous steel material as the main component and its content. The problem to be solved by the present invention is that (EN) It is intended to provide a brake friction material in which a "goo" brake squeal phenomenon does not occur at low speed braking.
上述した問題点を解決するために本発明は、配合率が２
５％以下となる鋼繊維に、１０〜２０％の配合率となる
セラミック繊維を充填剤として加え、結合剤として熱硬
化性を有するフェノール樹脂を用いると共に、潤滑剤と
して少なくとも黒鉛を含有させることによって、静摩擦
係数と動摩擦係数の比を０．８以上としてなる構成を採
用している。In order to solve the above-mentioned problems, the present invention has a compounding ratio of 2
By adding a ceramic fiber having a compounding ratio of 10 to 20% to a steel fiber of 5% or less as a filler, using a thermosetting phenol resin as a binder, and at least including graphite as a lubricant, The ratio of static friction coefficient to dynamic friction coefficient is 0.8 or more.
次に、本発明の構成およびその作用効果について詳述す
る。Next, the configuration of the present invention and its function and effect will be described in detail.
本発明において、ブレーキ摩擦材の主成分となる鋼材に
は、繊維状鋼材としての鋼繊維が２５％以下の配合率を
もって用いられる。そして、主な充填剤としては、セラ
ミック繊維等の無機繊維、硫酸バリウム等の無機塩、黒
鉛等の潤滑剤が用いられる。また、結合剤としては熱硬
化性樹脂であるフェノール樹脂が用られる。In the present invention, the steel material as the main component of the brake friction material is steel fiber as a fibrous steel material with a compounding ratio of 25% or less. As the main filler, inorganic fibers such as ceramic fibers, inorganic salts such as barium sulfate, and lubricants such as graphite are used. A phenol resin, which is a thermosetting resin, is used as the binder.
更に、本発明にあっては、セミ・メタリック製ブレーキ
摩擦材に見られるスティックスリップ現象の原因となる
静摩擦係数μｓと動摩擦係数μｍの大きな差を縮めるた
め、鋼繊維の配合率を２５％以下まで減少させている。
そして、該鋼繊維の減少に伴う動摩擦係数μｍの低下を
防止するためには、セラミック繊維等の無機繊維が有効
であるという知見に基づいて無機繊維を、即ち配合率が
１０〜２０％の範囲内となるセラミック繊維を添加し
た。この場合、静摩擦係数μｓと動摩擦係数μｍの差が
小さくなるようにして、その添加量を後述する実施例に
示すように種々検討し、得られたブレーキ摩擦材の静摩
擦係数μｓと動摩擦係数μｍのμｓ／μｍ比と計測した
“グー音”との関係を明らかにした。Furthermore, in the present invention, in order to reduce the large difference between the static friction coefficient μs and the dynamic friction coefficient μm that cause the stick-slip phenomenon found in the semi-metallic brake friction material, the steel fiber content is up to 25% or less. Is decreasing.
And, in order to prevent the decrease of the dynamic friction coefficient μm due to the decrease of the steel fiber, based on the finding that the inorganic fiber such as ceramic fiber is effective, the inorganic fiber, that is, the compounding ratio is in the range of 10 to 20%. The inner ceramic fiber was added. In this case, the difference between the static friction coefficient μs and the dynamic friction coefficient μm is made small, and the addition amount is variously studied as shown in Examples described later, and the static friction coefficient μs and the dynamic friction coefficient μm of the obtained brake friction material are The relationship between the μs / μm ratio and the measured “guo sound” was clarified.
本発明によれば、静摩擦係数μｓと動摩擦係数μｍのμ
ｓ／μｍ比を０．８以上にすることにより、“グー音”
を極度に小さくすることができた。この“グー音”の発
生を防止できた理由としては、ブレーキ摩擦材とディス
クの間のスティックスリップ現像が影響していると考え
られる。また、静摩擦係数μｓと動摩擦係数μｍのμｓ
／μｍ比を決定する動摩擦係数μｍの値と材料との関係
については、ディスクより高いモース硬度を有する材料
の配合量、例えばセラミック繊維の配合量（配合率）が
関係していると考えられる。According to the present invention, the coefficient of static friction μs and the coefficient of dynamic friction μm μ
By setting the s / μm ratio to 0.8 or higher, a "goo sound"
Could be made extremely small. It is considered that the stick-slip development between the brake friction material and the disk is influential as a reason why the generation of the "goo noise" can be prevented. In addition, the static friction coefficient μs and the dynamic friction coefficient μm μs
Regarding the relationship between the value of the dynamic friction coefficient μm that determines the / μm ratio and the material, it is considered that the compounding amount of the material having a Mohs hardness higher than that of the disk, for example, the compounding amount (mixing rate) of the ceramic fiber is related.
以上、詳述した如く本発明によれば、静摩擦係数μｓと
動摩擦係数μｍのμｓ／μｍ比が０．８以上になるよう
に、鋼繊維の配合率を２５％以下とし、これに配合率１
０〜２０％となるセラミック繊維を添加することにより
“グー音”の発生を防止でき、低速制動時におけるブレ
ーキ鳴き現像を確実に防止できる。As described above in detail, according to the present invention, the steel fiber content is set to 25% or less so that the ratio of static friction coefficient μs and dynamic friction coefficient μm is 0.8 or more.
By adding 0 to 20% of the ceramic fiber, it is possible to prevent the generation of "goo noise", and it is possible to reliably prevent the squeal development of the brake during low speed braking.
以下に、本発明の実施例を述べる。各実施例中、「％」
は配合率を示す。Examples of the present invention will be described below. "%" In each example
Indicates the blending ratio.
〔実施例１〕 組 成 鋼繊維 ２５％ セラミック繊維 １０％ フェノール樹脂 １０％ 黒鉛 ８％ その他の充填剤 ４７％ 成形方法 上記の材料を混合し、温度１５０℃、圧力５００Kgf/cm
2 の条件で加熱、加圧してディスクブレーキ用パッドを
成形した。[Example 1] Composition Steel fiber 25% Ceramic fiber 10% Phenolic resin 10% Graphite 8% Other fillers 47% Molding method The above materials are mixed and the temperature is 150 ° C and the pressure is 500 Kg f / cm.
The disc brake pad was molded by heating and pressurizing under the conditions of 2 .
特 性 得られたパッドの静摩擦係数μｓと動摩擦係数μｍの比
（以下、μｍ／μｓ比という）は０．８１である。Characteristics The ratio of the coefficient of static friction μs to the coefficient of dynamic friction μm of the obtained pad (hereinafter referred to as μm / μs ratio) is 0.81.
また、該パッドのμｍ／μｓ比と“グー音”との関係を
明らかにするため、“グー音”の計測を行なった。“グ
ー音”の計測はパッドに付けた加速度ピックアップによ
り行ない、振動の加速度Ｇの大きさで表示した。計測の
結果、振動の加速度Ｇは０．１であった。Further, in order to clarify the relationship between the μm / μs ratio of the pad and the “goo noise”, the “goo noise” was measured. The "guo sound" was measured by an accelerometer attached to the pad, and the magnitude of vibration acceleration G was displayed. As a result of the measurement, the acceleration G of vibration was 0.1.
〔実施例２〕 組 成 鋼繊維 ２５％ セラミック繊維 １５％ フェノール樹脂 １０％ 黒鉛 ８％ その他の充填剤 ４２％ 成形方法 上記の材料により実施例１に記載した方法を用いてパッ
ドを成形した。Example 2 Composition Steel fiber 25% Ceramic fiber 15% Phenolic resin 10% Graphite 8% Other fillers 42% Molding method A pad was molded from the above materials using the method described in Example 1.
特 性 得られたパッドのμｍ／μｓ比は0.83、振動の加速度Ｇ
は０．１以下である。Characteristics The obtained pad's μm / μs ratio is 0.83, vibration acceleration G
Is 0.1 or less.
〔実施例３〕 組 成 鋼繊維 ２５％ セラミック繊維 ２０％ フェノール樹脂 １０％ 黒鉛 ８％ その他の充填剤 ３７％ 成形方法 上記の材料により実施例１に記載した方法を用いてパッ
ドを成形した。Example 3 Composition Steel fiber 25% Ceramic fiber 20% Phenolic resin 10% Graphite 8% Other fillers 37% Molding method A pad was molded from the above materials using the method described in Example 1.
特 性 得られたパッドのμｍ／μｓ比は0.91、振動の加速度Ｇ
は０．１以下である。Characteristics μm / μs ratio of the obtained pad is 0.91, vibration acceleration G
Is 0.1 or less.
次に、上記実施例１，２，３と比較例１，２，３，４と
を次表に示す。Next, the above Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4 are shown in the following table.
ここで、実施例１〜３では、鋼繊維の配合率を２５％と
し、セラミック繊維の配合率を１０〜２０％の範囲内と
することにより、静摩擦係数μｓと動摩擦係数μｍとの
μｍ／μｓ比を０．８以上とすることができ、振動の加
速度Ｇを０．１以下まで下げることができた。Here, in Examples 1 to 3, the mixing ratio of the steel fibers was set to 25% and the mixing ratio of the ceramic fibers was set to be in the range of 10 to 20%, so that the static friction coefficient μs and the dynamic friction coefficient μm were μm / μs. The ratio could be 0.8 or more, and the vibration acceleration G could be reduced to 0.1 or less.
これに対し、比較例１〜４では、鋼繊維の配合率を５５
〜２５％まで徐々に減少させることによって、μｍ／μ
ｓ比が徐々に大きくなっている。しかし、実施例１〜３
のようにセラミック繊維の配合率１０〜２０％の範囲内
とはなっていないために、比較例１〜４では、動摩擦係
数μｍが低下してしまい、μｍ／μｓ比が０．７８以下
となって、振動の加速度Ｇが０．２以上になっている。On the other hand, in Comparative Examples 1 to 4, the mixing ratio of the steel fiber is 55
By gradually decreasing to ~ 25%, μm / μ
The s ratio is gradually increasing. However, Examples 1-3
As described above, since the compounding ratio of the ceramic fiber is not within the range of 10 to 20%, in Comparative Examples 1 to 4, the dynamic friction coefficient μm decreases, and the μm / μs ratio becomes 0.78 or less. The vibration acceleration G is 0.2 or more.
従って、本発明によれば、鋼繊維の配合率を２５％以下
とし、セラミック繊維の配合率を１０〜２０％の範囲内
とすることによって、静摩擦係数μｓと動摩擦係数μｍ
のμｍ／μｓ比を０．８以上とすることができると共
に、振動の加速度Ｇを０．１以下まで下げることがで
き、ブレーキの鳴き防止効果に優れたディスクブレーキ
用パッドとしてのブレーキ摩擦材を得ることができる。Therefore, according to the present invention, the static friction coefficient [mu] s and the dynamic friction coefficient [mu] m are set by setting the steel fiber content to 25% or less and the ceramic fiber content to within the range of 10 to 20%.
The μm / μs ratio can be 0.8 or more and the vibration acceleration G can be reduced to 0.1 or less, and a brake friction material as a disc brake pad excellent in the brake squeal prevention effect can be obtained. Obtainable.
なお、比較例１〜４におけるパッドの成形方法及び“グ
ー音”の計測方法は実施例１に同じである。The pad forming method and the “guo sound” measuring method in Comparative Examples 1 to 4 are the same as in Example 1.
図は各実施例と比較例のμｍ／μｓ比と振動の加速度Ｇ
を示した線図である。The figure shows the μm / μs ratio and vibration acceleration G of each example and comparative example.
It is the diagram which showed.
Claims (1)
〜２０％の配合率となるセラミック繊維を充填剤として
加え、結合剤として熱硬化性を有するフェノール樹脂を
用いると共に、潤滑剤として少なくとも黒鉛を含有さ
せ、静摩擦係数と動摩擦係数の比を０．８以上としてな
るブレーキ摩擦材。1. A steel fiber having a compounding ratio of 25% or less is 10
A ceramic fiber having a blending ratio of up to 20% is added as a filler, a thermosetting phenol resin is used as a binder, and at least graphite is included as a lubricant, and the ratio of static friction coefficient to dynamic friction coefficient is 0.8. Brake friction material as above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61194927A JPH0615891B2 (en) | 1986-08-20 | 1986-08-20 | Brake friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61194927A JPH0615891B2 (en) | 1986-08-20 | 1986-08-20 | Brake friction material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6353325A JPS6353325A (en) | 1988-03-07 |
| JPH0615891B2 true JPH0615891B2 (en) | 1994-03-02 |
Family
ID=16332658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61194927A Expired - Lifetime JPH0615891B2 (en) | 1986-08-20 | 1986-08-20 | Brake friction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0615891B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251090A (en) * | 2021-05-11 | 2021-08-13 | 大冶市启发矿产品有限公司 | Composite wear-resistant material for brake pad and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5811580A (en) * | 1981-07-13 | 1983-01-22 | Matsushita Electric Works Ltd | Friction material |
| JPS58136676A (en) * | 1982-01-23 | 1983-08-13 | Hitachi Chem Co Ltd | Composition for disc brake pad |
-
1986
- 1986-08-20 JP JP61194927A patent/JPH0615891B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6353325A (en) | 1988-03-07 |
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