JPH0723737B2 - Disc brake pad - Google Patents
Disc brake padInfo
- Publication number
- JPH0723737B2 JPH0723737B2 JP4025488A JP4025488A JPH0723737B2 JP H0723737 B2 JPH0723737 B2 JP H0723737B2 JP 4025488 A JP4025488 A JP 4025488A JP 4025488 A JP4025488 A JP 4025488A JP H0723737 B2 JPH0723737 B2 JP H0723737B2
- Authority
- JP
- Japan
- Prior art keywords
- friction
- friction material
- pad
- coefficient
- porous inorganic
- 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
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、ディスクブレーキパッドの改良に関する。TECHNICAL FIELD The present invention relates to an improvement of a disc brake pad.
［従来の技術］ 従来のディスクブレーキは、車輪と一体に回転するブレ
ーキディスクと、該ブレーキディスクの一面に押しつけ
られる第１ブレーキパッドと、該第１ブレーキパッドを
保持、押圧するつめ部材および該つめ部材に対向する位
置にシリンダ室を有するハウジングと、該ブレーキディ
スクの他面に押しつけられ該第１ブレーキパッドと対向
する第２ブレーキパッドと第２ブレーキパッドを保持押
圧し、該シリンダ室に摺動自在に保持されたピストンと
で構成される。そして前記ブレーキパッドは、同一組成
体で構成されている。[Prior Art] A conventional disc brake includes a brake disc that rotates integrally with a wheel, a first brake pad that is pressed against one surface of the brake disc, a pawl member that holds and presses the first brake pad, and the pawl. A housing having a cylinder chamber at a position facing the member, a second brake pad that is pressed against the other surface of the brake disc and faces the first brake pad, and presses and holds the second brake pad, and slides in the cylinder chamber. It is composed of a freely held piston. The brake pads are made of the same composition.
現在、自動車用ディスクブレーキの主流を占めるワンピ
ストン型キャリパはツメ側（アウター側）とピストン側
（インナー側）でパッドの面圧分布が異なる。従って均
一組成で形成した摩擦材では、摩擦面での摩擦条件に差
が生じ面圧の大きい箇所では摩擦係数がより高くなった
りする。この摩擦係数が高くなる部分がパッドのリーデ
ィング側で起きると不快な音であるブレーキ鳴きの現象
が現れる。このブレーキ鳴き現象を解決するために特開
昭61-184232号公報では、高密度で摩擦係数の小さい第
１摩擦材と低密度で摩擦係数の大きい第２摩擦材とを用
い、低面圧時には主として第１摩擦材部がロータと摩擦
を行い、高面圧時は第２摩擦材部がロータと摩擦を行う
ような特定部位に第１摩擦材、第２摩擦材を配置してブ
レーキ鳴きの発生および偏摩耗を低下させたパッドの開
示がある。Currently, the one-piston caliper, which is the mainstream of disc brakes for automobiles, has different surface pressure distributions of pads on the claw side (outer side) and the piston side (inner side). Therefore, in a friction material formed with a uniform composition, a difference occurs in friction conditions on the friction surface, and the friction coefficient becomes higher at a portion having a large surface pressure. When this high friction coefficient portion occurs on the leading side of the pad, an unpleasant sound of brake squealing appears. In order to solve this brake squeal phenomenon, Japanese Patent Laid-Open No. 61-184232 uses a first friction material having a high density and a small friction coefficient and a second friction material having a low density and a large friction coefficient. The first friction material portion mainly rubs against the rotor, and the second friction material portion rubs against the rotor when the surface pressure is high. There are disclosures of pads with reduced generation and uneven wear.
［発明が解決しようとする課題］ 前記第１摩擦材と第２摩擦材とでそれぞれ一部の摺動面
を形成する部分と他の部分を一体的に成形してパッドを
形成すると、組成が異なる材料を同時に熱成形すること
になり成形後の摩擦材は物性がばらついたパッドとなり
やすい。本出願人は先に特願昭61-298471号においてパ
ッドの摩擦面の面圧分布を測定し、面圧に相応した摺動
面部分を区分けし、各摺動面部分を形成する部分、部分
を相対的に摩擦係数の異なる摩擦材料で形成したディス
クブレーキパッドを提案した。この場合摩擦係数、密度
等の物性の異なる第１摩擦材と第２摩擦材とをそれぞれ
別途部分的に成形し、部分部分を組み合せて一つのパッ
ドを形成するものは、生産性が低く工程が煩雑となる。[Problems to be Solved by the Invention] When a pad is formed by integrally molding a part that forms a part of a sliding surface and another part of the first friction material and the second friction material, respectively, a composition is obtained. Since different materials are thermoformed at the same time, the friction material after the molding tends to be a pad having different physical properties. The applicant previously measured the surface pressure distribution on the friction surface of the pad in Japanese Patent Application No. 61-298471, divides the sliding surface portion corresponding to the surface pressure, and forms each sliding surface portion. We proposed a disc brake pad made of friction materials with different friction coefficients. In this case, a product in which the first friction material and the second friction material having different physical properties such as a friction coefficient and a density are separately formed separately and the one portion is combined to form one pad has low productivity It becomes complicated.
この発明は前記の問題点に基づきなされたもので、２種
類の摩擦材を同時に型成形しても成形バラツキがない安
定し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 based on the above problems, and an object of the present invention is to provide a stable disc brake pad having no molding variation even when two types of friction materials are molded at the same time.
［課題を解決するための手段］ 本発明のディスクブレーキパッドは、摩擦係数の異なる
少なくとも２種の摩擦材でそれぞれ一部の摺動面を形成
する部分と他の部分を一体的に形成配置して構成される
ディスクブレーキパッドにおいて、 前記摩擦材はそれぞれ多孔質無機材料を含有し、摩擦係
数の小さい摩擦材には前記多孔質無機材料に潤滑剤が含
浸または付着して一体化されていることを特徴とする。[Means for Solving the Problem] In the disc brake pad of the present invention, at least two types of friction materials having different friction coefficients are integrally formed and arranged to form a part of a sliding surface and another part. In the disc brake pad configured as above, each of the friction materials contains a porous inorganic material, and the friction material having a small friction coefficient is impregnated with or adhered to the porous inorganic material to be integrated. Is characterized by.
摩擦係数μの異なる摩擦材とは、摩擦係数が少なくとも
0.2以上異なるものをいう。この摩擦係数の差の調整
は、通常基材に対して添加する添加剤の成分およびその
量により行われる。この摩擦係数の異なる２種類の摩擦
材は各々所定形状に予備成形した後、製造すべきパッド
の所定の部分となるべき金型の所定の位置にそれぞれ配
置され、金型内で一体的に熱成形、熱処理して製造され
るものである。Friction materials having different friction coefficients μ have a friction coefficient of at least
It means something different by 0.2 or more. The adjustment of the difference in friction coefficient is usually performed by the component and the amount of the additive added to the base material. These two types of friction materials having different friction coefficients are respectively preformed into a predetermined shape and then arranged at predetermined positions of a mold to be a predetermined portion of a pad to be manufactured, and are integrally heated in the mold. It is manufactured by molding and heat treatment.
２種類の摩擦材は、潤滑剤を除きほぼ共通の基材および
添加剤から構成されている。基材としては、スチールフ
ァイバー等の鉄系金属繊維、真鍮、銅などの非鉄系金属
繊維、ガラス繊維などのセラミック系繊維、セルロース
繊維、芳香族ポリアミド繊維などの有機繊維を一種また
は併用して用いることができる。さらに前記基材に無
機、有機の添加剤とともに結合用の樹脂が配合される。
この添加剤としては、硫酸バリウム、珪藻土、ドロマイ
ト、炭酸カルシウム、水酸化カルシウム、シリカ、硫化
物（二硫化モリブデン、硫化タングステン）等の無機物
粉末、カシューダスト、ラバーダストなどの有機物粉
末、アルミニウム、鉄、亜鉛等の金属粉末などを用いる
ことができる。The two types of friction materials are composed of almost common base materials and additives except for the lubricant. As the base material, ferrous metal fibers such as steel fibers, non-ferrous metal fibers such as brass and copper, ceramic fibers such as glass fibers, organic fibers such as cellulose fibers and aromatic polyamide fibers are used alone or in combination. be able to. Further, a resin for binding is blended with the base material together with inorganic and organic additives.
Examples of the additive include barium sulfate, diatomaceous earth, dolomite, calcium carbonate, calcium hydroxide, silica, inorganic powders such as sulfides (molybdenum disulfide, tungsten sulfide), organic powders such as cashew dust and rubber dust, aluminum and iron. Metal powders such as zinc and the like can be used.
また主として摩耗調整に用いられる添加剤としては、ア
ルミナ、窒化珪素、窒化硼素等の窒化物、酸化マグネシ
ウム、ジルコニア、酸化スズ、二酸化マンガンなどを用
いることができる。In addition, as additives mainly used for wear adjustment, alumina, silicon nitride, nitrides such as boron nitride, magnesium oxide, zirconia, tin oxide, manganese dioxide and the like can be used.
さらに添加剤の一部は多孔質無機材料に代替される。こ
の多孔質無機材料は、多孔質ないしは中空形状を有し潤
滑剤の液体または微粉体を吸湿ないしは付着保持するこ
とが出来るもので、例えばシラスバルーン、多孔質ガラ
スビーズ、中空炭酸カルシウム、多孔質ケイ酸カルシウ
ムなどが使用できる。好ましくはケイ酸カルシウムを主
成分としたものを用いるのがよい。Furthermore, some of the additives are replaced by porous inorganic materials. This porous inorganic material has a porous or hollow shape and is capable of absorbing or adhering and retaining a liquid or fine powder of a lubricant, such as shirasu balloon, porous glass beads, hollow calcium carbonate, and porous silica. Calcium acid etc. can be used. It is preferable to use calcium silicate as a main component.
多孔質無機材料に含浸または付着させる潤滑剤は耐熱性
の液状のシリコン油などとグラファイトの微粉末などが
用いられる。As the lubricant to be impregnated or attached to the porous inorganic material, heat-resistant liquid silicon oil or the like and fine graphite powder are used.
結合樹脂としては、フェノール樹脂、ブチラール系樹
脂、フェノキシ系樹脂およびエポキシ系樹脂を用いるこ
とができる。フェノール樹脂とはフェノール、クレゾー
ルなどのフェノール類の一種以上をホルムアルデヒド又
はその発生源となる化合物により縮合させて得られ、耐
熱性などの点で好ましい結合材である。As the binding resin, phenol resin, butyral resin, phenoxy resin and epoxy resin can be used. Phenolic resin is a binder obtained by condensing one or more phenols such as phenol and cresol with formaldehyde or a compound as a source thereof, and is a preferable binder in terms of heat resistance.
この多孔質無機材料の使用量は、摩擦材を100重量％と
したとき５〜15重量％であることが好ましい。またこの
多孔質無機材料は２種類の摩擦材に等量添加することが
好ましい。多孔質無機材料に添加する潤滑剤は、多孔質
無機材料100容積％に対し５〜15容積％であることが好
ましい。この潤滑剤の添加量が５％未満であると摩擦係
数の差を与えることができず20％を越えると摩擦係数が
小さくなりすぎて摩擦材としての性能を付与できなくな
る。The amount of the porous inorganic material used is preferably 5 to 15% by weight when the friction material is 100% by weight. Further, it is preferable to add an equal amount of this porous inorganic material to the two types of friction materials. The lubricant added to the porous inorganic material is preferably 5 to 15 volume% with respect to 100 volume% of the porous inorganic material. If the amount of this lubricant added is less than 5%, a difference in friction coefficient cannot be provided, and if it exceeds 20%, the friction coefficient becomes too small to provide the performance as a friction material.
また摩擦係数の高い摩擦材には、多孔質無機材料の他に
アブレッシング材を添加して摩擦係数を高くすることが
できる。好ましくはこのアブレッシング材を一方の摩擦
材に添加することにより摩擦係数を物性を変えることな
く調整することができる。In addition to the porous inorganic material, an abrasive material can be added to the friction material having a high friction coefficient to increase the friction coefficient. Preferably, by adding this abrasive material to one of the friction materials, the friction coefficient can be adjusted without changing the physical properties.
本発明のディスクブレーキパッドは以下の様にして製造
される。基材および結合樹脂、多孔質無機材料、および
その他の添加剤を添加し混合機で混合原料を製造する。
なお摩擦係数の高い摩擦材を形成する混合原料中には、
多孔質無機材料のみを用いる。一方摩擦係数の低い摩擦
材を形成する混合原料中には、多孔質無機材料に潤滑剤
が含浸されて一体化されたものを用いる。この混合原料
を予備成形して粗成形体を形成する。ついで摩擦係数の
異なる各摩擦材の粗成形体を所定の金型内の位置に固定
し熱成形、熱処理、研磨を行なって各摩擦材が一体的に
形成されて得られるレジンモールドタイプのパッドであ
る。The disc brake pad of the present invention is manufactured as follows. A base material and a binder resin, a porous inorganic material, and other additives are added to produce a mixed raw material with a mixer.
In addition, in the mixed raw material forming the friction material having a high friction coefficient,
Only porous inorganic materials are used. On the other hand, in the mixed raw material forming the friction material having a low friction coefficient, a porous inorganic material impregnated with a lubricant and integrated is used. This mixed raw material is preformed to form a rough compact. Then, using a resin mold type pad obtained by fixing the roughly molded body of each friction material having a different friction coefficient to a predetermined position in the mold and performing thermoforming, heat treatment and polishing to integrally form each friction material. is there.
［発明の作用と効果］ 本発明はそれぞれ多孔質無機材料を含有し、摩擦係数の
小さい摩擦材には前記多孔質無機材料に潤滑剤が含浸ま
たは付着して一体化された少なくとも２種の摩擦材の粗
成形体を、一体的に形成して構成したディスクブレーキ
パッドである。潤滑剤を含浸させて一体化させた多孔質
無機材料を配合した摩擦係数の低い摩擦材と多孔質無機
材料を配合した高摩擦係数の摩擦材とにより物性に差や
バラツキを生ずることなく一体的にパッドを成形するこ
とができる。[Operations and Effects of the Invention] The present invention contains at least two kinds of friction materials each containing a porous inorganic material, and a friction material having a small coefficient of friction is integrated by impregnating or adhering a lubricant to the porous inorganic material. The disc brake pad is formed by integrally forming a rough-formed body of the material. A friction material with a low coefficient of friction mixed with a porous inorganic material that is impregnated with a lubricant and a friction material with a high coefficient of friction mixed with a porous inorganic material are integrated without any difference or variation in physical properties. The pad can be molded into.
このパッドは摩擦時に多孔質無機材料が摩擦面での圧力
と熱により破壊されて潤滑剤が摩擦面へ供給されるため
摩擦係数が小さくなり潤滑剤を含浸していない多孔質無
機材料を含む摩擦材は摩擦係数が大きくなり両者に摩擦
係数の差ができる。The friction coefficient of this pad is reduced because the porous inorganic material is destroyed by pressure and heat on the friction surface at the time of friction and the lubricant is supplied to the friction surface. The material has a large coefficient of friction, and a difference in coefficient of friction occurs between the two.
従って摩擦材の組成はほぼ同一であるが含浸された潤滑
剤により摩擦係数の調整を行なっているため、初期より
中期にかけてのパッドの性能を変化させることが少なく
ブレーキ鳴きの発生を防ぐことができる。Therefore, the composition of the friction material is almost the same, but since the friction coefficient is adjusted by the impregnated lubricant, the performance of the pad is not changed from the initial stage to the middle period, and the occurrence of brake squeal can be prevented. .
［実施例］ 以下実施例により本発明を説明する。[Examples] The present invention will be described below with reference to Examples.
（潤滑剤が含浸された多孔質無機材料の調整） 多孔質無機材料はケイ酸カルシウム系（組成SiO268％、
CaO29％、Al2O3１％、ステアリン酸カルシウム２％（粒
径40μｍ以下）、商品名フローライト、徳山曹逹株式会
社製）の粉末である、潤滑剤はシリコーン油と微粉グラ
ファイト（20μｍ以下）を体積比で1:1の割で混合して
形成した。この潤滑剤を上記多孔質無機材料粉末に混合
して含浸または付着して一体化した。混合割合は体積比
で多孔質無機粉末：潤滑剤＝3:1である。(Preparation of porous inorganic material impregnated with lubricant) The porous inorganic material is calcium silicate (composition SiO 2 68%,
CaO 29%, Al 2 O 3 1%, calcium stearate 2% (particle size 40 μm or less), trade name Fluorite, manufactured by Tokuyama Soju Co., Ltd., lubricant is silicone oil and fine graphite (20 μm or less) Were formed by mixing at a volume ratio of 1: 1. This lubricant was mixed with the above-mentioned porous inorganic material powder and impregnated or adhered to be integrated. The mixing ratio by volume is porous inorganic powder: lubricant = 3: 1.
（摩擦材の成形） 第１摩擦材（高い摩擦係数を有する）は、基材繊維とし
て真ちゅうファイバーを35重量％、多孔質無機材料とし
てフローライトを10重量％、摩擦調整剤として三硫化ア
ンチモンを（粒径20μｍ以下）７重量％、アブレッシン
グ剤としてSiO2を（粒径10μｍ以下）10重量％、無機添
加剤として硫酸バリウム（粒径30μｍ以下）を23重量％
および結合樹脂としてフェノール樹脂を15重量％を混合
し予備成形した。(Molding of friction material) The first friction material (having a high friction coefficient) was made of 35% by weight of brass fiber as the base fiber, 10% by weight of fluorite as the porous inorganic material, and antimony trisulfide as the friction modifier. 7% by weight (particle size 20 μm or less), SiO 2 as an abrasive agent (particle size 10 μm or less) 10% by weight, barium sulfate (particle size 30 μm or less) 23% by weight as an inorganic additive
And 15% by weight of a phenol resin as a binder resin was mixed and preformed.
第２摩擦材（低い摩擦係数をもつ）は、前記多孔質無機
材料（前記の潤滑剤を含浸・付着させたもの）を15重量
％と増しアブレッシングを添加せず無機添加剤（BaS
O4）を28重量％とした以外は第１摩擦材と同様である。
このディスクブレーキパッドは、第２図の摩擦面の平面
図に示すようにほぼ四辺形状の厚板状である。このパッ
ドの裏面にバックプレートが結合されている。前記第１
摩擦材と第２摩擦材の予備成形で得た粗成形体を第２図
に示すようにパッドの中央上部端面側に第１摩擦材の粗
成形体を配置しその周辺に第２摩擦材の粗成形体を配置
して熱成形、熱処理、研磨工程を行なって一体的に本実
施例のパッドを形成した。The second friction material (having a low friction coefficient) is 15% by weight of the above-mentioned porous inorganic material (impregnated and adhered with the above-mentioned lubricant), and the inorganic additive (BaS
Same as the first friction material except that O 4 ) was 28% by weight.
This disc brake pad is a substantially quadrilateral thick plate as shown in the plan view of the friction surface in FIG. A back plate is bonded to the back surface of this pad. The first
As shown in FIG. 2, the rough-formed body obtained by preforming the friction material and the second friction material is arranged with the rough-formed body of the first friction material on the upper end face side of the center of the pad, and the second friction material The rough compact was placed and subjected to thermoforming, heat treatment and polishing to integrally form the pad of this example.
なお比較用に第１摩擦材および第２摩擦材の粗成形体を
それぞれ単独で熱成形、熱処理を行なって摩擦材を形成
した。この摩擦の物性値を第１表に示す。第１摩擦材、
第２摩擦材の物性値の硬度、比重、気孔率、圧縮歪はほ
ぼ同一であった。For comparison, the first friction material and the second friction material rough compacts were individually heat-formed and heat-treated to form the friction material. The physical properties of this friction are shown in Table 1. First friction material,
The hardness, specific gravity, porosity, and compressive strain of the physical properties of the second friction material were almost the same.
比較例として多孔質無機材料を含まない摩擦係数の高い
第３摩擦材と摩擦係数の低い第４摩擦材を実施例と同様
にして組成形体を作製した。組成は第１表に示すように
第３摩擦材が基材繊維の真ちゅうファイバー、フェノー
ル樹脂、摩擦調整剤の三硫化アンチモン、アブレッシン
グのSiO2、無機添加剤のBaSO4で形成されている。As a comparative example, a third shaped friction material containing no porous inorganic material and having a high friction coefficient and a fourth friction material having a low friction coefficient were prepared in the same manner as in the example to prepare a composition form. In the composition, as shown in Table 1, the third friction material is formed of brass fiber as a base fiber, phenol resin, antimony trisulfide as a friction modifier, SiO 2 as an abrasive, and BaSO 4 as an inorganic additive.
第４摩擦材は、第３摩擦材のアブレッシングを添加せず
無機添加剤量を10重量％代えた以外は 同様にして粗成形体を製作した。この第３摩擦材と第４
摩擦材の予備成形で得た粗成形体を実施例の場合と同様
に第２図に示したパッドの位置に第３摩擦材を第１摩擦
材の位置に第４摩擦材を第２摩擦材の位置に配置して一
体的に成形を行なって比較例のパッドを形成した。The fourth friction material was the same as the third friction material except that the abrasive was not added and the amount of the inorganic additive was changed to 10% by weight. A rough compact was manufactured in the same manner. This third friction material and the fourth
As in the case of the embodiment, the rough molded body obtained by the preliminary molding of the friction material is provided with the third friction material at the pad position shown in FIG. 2 and the fourth friction material at the first friction material position and the second friction material. The pad of the comparative example was formed by arranging at the position of 1 and molding integrally.
なお参考に第３摩擦材、第４摩擦材の粗成形体をそれぞ
れ単独に熱成形、熱処理してそれぞれの単独の摩擦材を
製作した。その組成および物性値を第１表に示す。物性
値は第３摩擦材と第４摩擦材とは異なっていることを示
している。For reference, the third friction material and the fourth friction material rough compacts were individually thermoformed and heat treated to produce individual friction materials. The composition and physical property values are shown in Table 1. The physical property values indicate that the third friction material and the fourth friction material are different.
［評価］ 三種のパッド（第１摩擦材単独１、第２摩擦材単独２、
本実施例３）について、JASO規格のC406の試験方法に基
づく摩擦性能の試験を行なった。第１図は縦軸に摩擦係
数μを横軸に油圧をとり第２効力試験結果のグラフを示
す。なお速度は50km/hrである。第１摩擦材１と第２摩
擦材２とは第１表に示したように物性値は類似している
が摩擦係数は異なる。すなわち第１摩擦材１（白丸印）
の摩擦係数は0.5であり第２摩擦材２（黒丸印）の摩擦
係数は約0.25である。一方本実施例３は第１摩擦材と第
２摩擦材とを第２図に示すように配置して形成した（図
中上部中央部に第１摩擦材が周辺部に第２摩擦材が配置
されている）。この摩擦試験結果は、第１図の３（黒印
三角印）に示すように始めは第２摩擦材２とほぼ同じ摩
擦係数を示すが油圧値の増加にともなって第１摩擦材１
の摩擦係数と同じになっていく併用効果を示している。
すなわち低油圧では摩擦係数の低い摩擦面で摩擦し油圧
が高まるにつれて高い摩擦係数の摩擦面で摩擦してい
る。[Evaluation] Three types of pads (first friction material alone 1, second friction material alone 2,
For this Example 3), a friction performance test was conducted based on the test method of C406 of JASO standard. FIG. 1 is a graph showing the results of the second efficacy test in which the vertical axis represents the friction coefficient μ and the horizontal axis represents the hydraulic pressure. The speed is 50km / hr. As shown in Table 1, the first friction material 1 and the second friction material 2 have similar physical property values but different friction coefficients. That is, the first friction material 1 (white circle)
Has a coefficient of 0.5, and the second friction material 2 (black circle) has a coefficient of friction of about 0.25. On the other hand, in the third embodiment, the first friction material and the second friction material are arranged as shown in FIG. 2 (the first friction material is arranged in the central portion of the upper portion of the drawing and the second friction material is arranged in the peripheral portion thereof). Has been). The friction test result shows that the friction coefficient is almost the same as that of the second friction material 2 at first as shown by 3 (black triangle mark) in FIG. 1, but the first friction material 1 increases as the hydraulic pressure increases.
It shows the combined effect of becoming the same as the friction coefficient of.
That is, when the hydraulic pressure is low, the friction surface has a low friction coefficient, and as the hydraulic pressure increases, the friction surface has a high friction coefficient.
次に本実施例と比較例の多孔質無機材料を含まない二種
のパッドの摩擦試験をJASO規格試験のC406に基づいて行
なった。Next, a friction test of two types of pads containing no porous inorganic material of the present example and the comparative example was performed based on JASO standard test C406.
第１効力・第２効力ともほぼ同じ摩擦係数を示すが第３
効力になると比較例では摩擦係数が低下する傾向を示す
が、本実施例は特に変化を示さなかった。一方比較例品
は中央の摩擦係数が高い第３摩擦材で形成されている部
分が極度に摩耗しており摩擦係数の低い第４摩擦材部の
摩擦面で制動を行なっていたと考えられる。その理由と
しては、フェードを経過すると摩擦係数の高い中央部が
多くの摩擦仕事をするため摩耗が多くなり極端な下当り
になったためと考えられる。一方本実施例品は、殆んど
偏摩耗しておらず平坦に摩耗している。すなわち物性の
均一さが偏摩耗の発生を防いでいると考えられる。The first and second effects show almost the same friction coefficient, but the third effect
The friction coefficient tends to decrease in the comparative example when it becomes effective, but this example shows no particular change. On the other hand, in the comparative example product, it is considered that the central portion formed of the third friction material having a high friction coefficient was extremely worn, and braking was performed by the friction surface of the fourth friction material portion having a low friction coefficient. It is considered that the reason for this is that after the fade, the central portion having a high friction coefficient performs a lot of frictional work, and wear is increased, resulting in an extreme hitting. On the other hand, the product of this example is not unevenly worn and is worn flat. That is, it is considered that the uniformity of physical properties prevents the occurrence of uneven wear.
次に鳴き防止効果について確認試験を行なった。試験機
は前記と同じである。試験方法は減速度0.13G、速度50k
m/h、制動前温度120℃で1000回摺り合せの後速度20km/
h、油圧５、10、10.5kgf/cm2、温度40℃、80℃、120
℃、80℃のパッド評価（20回制動）を１サイクルとし、
５サイクル実施し、その後減速度0.6G、速度100km/h、
制動インターバル50sec、制動前ロータ温度65℃で10回
制動を実施した（フェード試験）。そしてパッド評価を
３サイクル実施した。その結果を第３図に示す。第３図
は縦軸は鳴き発生率で横軸はサイクル数である。比較例
では評価サイクルが増す毎に鳴き発生率が増加している
が本実施例品は発生していない。これは比較例品が偏摩
耗のために、当り方が変化しパッドが下当り中央部（第
１摩擦材の下部の第２摩擦材部位に面接する現象）を生
じたためである。Next, a confirmation test was performed for the squeal prevention effect. The test machine is the same as above. Test method is deceleration 0.13G, speed 50k
m / h, temperature before braking 120 ℃, after sliding 1000 times, speed 20 km /
h, hydraulic pressure 5, 10, 10.5kgf / cm 2 , temperature 40 ℃, 80 ℃, 120
℃, 80 ℃ pad evaluation (20 times braking) as one cycle,
After 5 cycles, deceleration 0.6G, speed 100km / h,
Braking was performed 10 times at a braking interval of 50 seconds and a rotor temperature of 65 ° C before braking (fade test). And pad evaluation was implemented for 3 cycles. The results are shown in FIG. In FIG. 3, the vertical axis represents the squeal occurrence rate and the horizontal axis represents the number of cycles. In the comparative example, the squealing occurrence rate increases as the evaluation cycle increases, but the product of this example does not occur. This is because the contact of the comparative example product changed due to uneven wear, and the pad had a lower contact center portion (a phenomenon in which the pad contacted the second friction material portion below the first friction material).
第１図は第１摩擦材と第２摩擦材のそれぞれ単独および
本実施例のパッドに配置した場合の摩擦係数の変化を示
すグラフであり、第２図は本実施例のパッド中の第１摩
擦材と第２摩擦材の配置状態を示す平面説明図であり、
第３図は実施例と比較例のブレーキ鳴き発生率を摺り合
せ後、フェード後に測定した結果を示すグラフである。 １……第１摩擦材、２……第２摩擦材 ３……実施例パッドFIG. 1 is a graph showing changes in the coefficient of friction when the first friction material and the second friction material are placed individually and in the pad of this embodiment, and FIG. 2 is the first of the pads of this embodiment. It is a plane explanatory view showing an arrangement state of a friction material and a second friction material,
FIG. 3 is a graph showing the results of measuring the brake squeal occurrence rates of the example and the comparative example after the sliding and the fade. 1 ... 1st friction material, 2 ... 2nd friction material 3 ... Example pad
Claims (1)
でそれぞれ一部の摺動面を形成する部分と他の部分とを
一体的に形成して構成されるディスクブレーキパッドに
おいて、 前記摩擦材はそれぞれ多孔質無機材料を含有し、摩擦係
数の小さい摩擦材には前記多孔質無機材料に潤滑剤が含
浸または付着して一体化されていることを特徴とするデ
ィスクブレーキパッド。1. A disc brake pad, which is formed by integrally forming a part that forms a part of a sliding surface and at least another part with at least two types of friction materials having different friction coefficients. Disc brake pads, each of which contains a porous inorganic material, and the friction material having a small friction coefficient is integrated by impregnating or adhering a lubricant to the porous inorganic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4025488A JPH0723737B2 (en) | 1988-02-23 | 1988-02-23 | Disc brake pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4025488A JPH0723737B2 (en) | 1988-02-23 | 1988-02-23 | Disc brake pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01216135A JPH01216135A (en) | 1989-08-30 |
| JPH0723737B2 true JPH0723737B2 (en) | 1995-03-15 |
Family
ID=12575549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4025488A Expired - Lifetime JPH0723737B2 (en) | 1988-02-23 | 1988-02-23 | Disc brake pad |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0723737B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2901376B2 (en) * | 1991-05-14 | 1999-06-07 | 曙ブレーキ工業株式会社 | Composite friction material |
| DE102008049430B9 (en) * | 2007-10-16 | 2020-10-08 | Inno Friction Gmbh | Friction lining |
| DE102009009131B4 (en) | 2009-02-17 | 2012-10-04 | Tmd Friction Services Gmbh | Process for producing a brake pad, brake pad |
| US9915331B2 (en) * | 2016-01-15 | 2018-03-13 | Schaeffler Technologies AG & Co. KG | Wet friction materials including calcium silicate |
| CN113586637B (en) * | 2021-07-02 | 2023-03-10 | 中铁隆昌铁路器材有限公司 | Synthetic brake pad for power-concentrated motor train unit vehicle and preparation method thereof |
-
1988
- 1988-02-23 JP JP4025488A patent/JPH0723737B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01216135A (en) | 1989-08-30 |
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