JPH0617030A - Brake friction material - Google Patents
Brake friction materialInfo
- Publication number
- JPH0617030A JPH0617030A JP17347892A JP17347892A JPH0617030A JP H0617030 A JPH0617030 A JP H0617030A JP 17347892 A JP17347892 A JP 17347892A JP 17347892 A JP17347892 A JP 17347892A JP H0617030 A JPH0617030 A JP H0617030A
- Authority
- JP
- Japan
- Prior art keywords
- friction
- friction material
- weight
- brake friction
- brake
- 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.)
- Withdrawn
Links
- 239000002783 friction material Substances 0.000 title claims abstract description 43
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 244000226021 Anacardium occidentale Species 0.000 claims abstract description 18
- 235000020226 cashew nut Nutrition 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 18
- 239000000314 lubricant Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 239000003607 modifier Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 24
- 230000000052 comparative effect Effects 0.000 description 17
- 235000019589 hardness Nutrition 0.000 description 16
- 239000000203 mixture Substances 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010466 nut oil Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
Abstract
(57)【要約】
【目的】 制動時に、ディスクロータに対する摩擦係数
を適正値に維持し、かつ異音が発生することを有効に防
止することが可能なブレーキ摩擦材の提供を目的とす
る。
【構成】 銅繊維を１０〜３０重量％含有し、かつカシ
ュー樹脂を５〜２０重量％含有するブレーキ摩擦材で
は、効力試験時の摩擦係数μが０.３〜０.４５、フェー
ド試験時の摩擦係数μが０.１８ 以上と安定する。ま
た、硬度ＨＲＳを５０以下に調整することによって、異
音発生頻度も５.０％ 以下と非常に低い値となることが
確認された。
(57) [Abstract] [Purpose] An object of the present invention is to provide a brake friction material capable of maintaining an appropriate coefficient of friction with respect to a disk rotor during braking and effectively preventing abnormal noise from being generated. [Structure] A brake friction material containing 10 to 30% by weight of copper fiber and 5 to 20% by weight of cashew resin has a friction coefficient μ of 0.3 to 0.45 in the effectiveness test and a fade test of The coefficient of friction μ is stable at 0.18 or more. It was also confirmed that the abnormal sound generation frequency was as low as 5.0% or less by adjusting the hardness HRS to 50 or less.
Description
【０００１】[0001]
【産業上の利用分野】この発明は、自動車等に使用され
るブレーキ摩擦材に係り、特に、制動時の異音防止に優
れたノンアスベストのブレーキ摩擦材に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake friction material used in automobiles and the like, and more particularly to a non-asbestos brake friction material excellent in preventing abnormal noise during braking.
【０００２】[0002]
【従来の技術】従来より、基材にスチール繊維、潤滑材
に黒鉛、充填材に硫酸バリウム、結合材にフェノール樹
脂をそれぞれ用い、これら各成分が均一となるように充
分に混合撹拌した後に、成形することにより作製された
ブレーキ摩擦材が知られている。2. Description of the Related Art Conventionally, steel fiber is used as a base material, graphite is used as a lubricant, barium sulfate is used as a filler, and a phenol resin is used as a binder. After sufficiently mixing and agitating each of these components, A brake friction material produced by molding is known.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記のよう
に構成されたブレーキ摩擦材では、制動による温度上昇
に伴って、ディスクロータとの接触部分における潤滑性
が失われ、その結果、基材であるスチール繊維とディス
クロータとの摩擦係数が必要以上に上昇して、異音（ス
キール音：1000〜20000Hz） が発生し、運転手等に不快
感を与えるという問題があった。そして、このような異
音の発生を防止するために、潤滑材を増量させることも
考えられるが、このように潤滑材を増量した場合には、
反対に摩擦係数が低下してブレーキ力が低下するという
問題が生じていた。By the way, in the brake friction material configured as described above, the lubricity at the contact portion with the disk rotor is lost as the temperature rises due to braking, and as a result, the base material There was a problem that the friction coefficient between a certain steel fiber and the disk rotor increased more than necessary, and an abnormal noise (squeal noise: 1000 to 20000Hz) was generated, which gave a driver discomfort. Then, in order to prevent the generation of such abnormal noise, it is conceivable to increase the amount of the lubricant, but when the amount of the lubricant is increased in this way,
On the contrary, there has been a problem that the friction coefficient is reduced and the braking force is reduced.
【０００４】本発明は、上記の事情に鑑みてなされたも
のであって、制動時に、ディスクロータに対する摩擦係
数を適正値に維持し、かつ異音が発生することを有効に
防止できるブレーキ摩擦材の提供を目的とする。The present invention has been made in view of the above circumstances, and a brake friction material capable of maintaining an appropriate coefficient of friction with respect to a disk rotor during braking and effectively preventing abnormal noise from being generated. For the purpose of providing.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明では、基材に、潤滑材、充填材、結合材、摩擦
調整材などを配合して得られるブレーキ摩擦材におい
て、前記基材の一部に銅繊維を用い、この銅繊維を１０
〜３０重量％の割合で含有させ、また、前記摩擦調整材
の一部にカシュー樹脂を用い、このカシュー樹脂を５〜
２０重量％の割合で含有させ、更に全体の硬さをＨＲＳ
で５０以下に調整するようにした。To achieve the above object, the present invention provides a brake friction material obtained by blending a base material with a lubricant, a filler, a binder, a friction modifier, and the like. Copper fiber is used as a part of the material,
-30% by weight, cashew resin is used as a part of the friction modifier,
It is contained at a rate of 20% by weight, and the total hardness is HRS.
It was adjusted to 50 or less.
【０００６】[0006]
【作用】この発明によれば、銅繊維を１０〜３０重量％
含有させ、かつカシュー樹脂を５〜２０重量％含有させ
ることにより、効力試験時及びフェード試験時の摩擦係
数を適正範囲内とすることができ、また、硬度ＨＲＳを
５０以下に調整することによって、異音発生頻度を低く
抑えることが可能となる。具体的には、以下の実施例で
示すように、銅繊維を１０〜３０重量％含有させ、かつ
カシュー樹脂を５〜２０重量％含有させることにより、
効力試験時の摩擦係数μが０.３〜０.４５、フェード試
験時の摩擦係数μが０.１８ 以上と安定し、かつ、効力
試験時及びフェード試験時の摩擦係数μの範囲について
もばらつきが無く、また、全体の硬度ＨＲＳを５０以下
に調整することによって、異音発生頻度を５〔％〕以下
に抑えることが可能となる。According to the present invention, the copper fiber content is 10 to 30% by weight.
By including the cashew resin in an amount of 5 to 20% by weight, the friction coefficient during the efficacy test and the fade test can be set within an appropriate range, and the hardness HRS is adjusted to 50 or less. It is possible to reduce the frequency of occurrence of abnormal noise. Specifically, as shown in the following examples, by containing 10 to 30% by weight of copper fibers and 5 to 20% by weight of cashew resin,
The friction coefficient μ during the efficacy test is stable at 0.3 to 0.45, the friction coefficient μ during the fade test is 0.18 or more, and the range of the friction coefficient μ during the efficacy test and the fade test also varies. In addition, by adjusting the overall hardness HRS to 50 or less, it is possible to suppress the abnormal noise occurrence frequency to 5 [%] or less.
【０００７】[0007]
【実施例】本発明に係るブレーキ摩擦材を作製してその
効果を確認した。まず、その製造工程を以下の（１）
（２）に示す。 （１） 基材として銅繊維、スチール繊維、セラミック
繊維、アラミド繊維、結合材としてフェノール樹脂、充
填材として硫酸バリウム、摩擦調整材としてカシュー樹
脂、ｐＨ調整材として水酸化カルシウム、潤滑材として
黒鉛をそれぞれ用意した。また、その他の成分として、
ゴム粉やシリカ、アルミナ等のセラミック粉、または銅
粉、鉄粉などの摩擦調整材も使用されるが、微量である
ので、詳細な説明は省略する。なお、これらの材料の中
で、銅繊維はスチール繊維と比較してモース硬度が低く
ロータを傷付けないものであり、また、カシュー樹脂は
カシューナットオイルで変性したフェノールを主原料と
した樹脂である。EXAMPLE A brake friction material according to the present invention was produced and its effect was confirmed. First, the manufacturing process is as follows (1)
It shows in (2). (1) Copper fiber, steel fiber, ceramic fiber, aramid fiber as base material, phenol resin as binder, barium sulfate as filler, cashew resin as friction adjuster, calcium hydroxide as pH adjuster, graphite as lubricant I prepared each. Also, as other ingredients,
Rubber powder, ceramic powder such as silica or alumina, or friction adjusting material such as copper powder or iron powder is also used, but the detailed description thereof is omitted because it is a minute amount. Among these materials, copper fiber has a lower Mohs hardness than steel fiber and does not damage the rotor, and cashew resin is a resin whose main raw material is phenol modified with cashew nut oil. .
【０００８】（２） 前記材料を、図１に示す表の通り
に配合し、更に、これを混合、乾燥した後、所定の金型
に投入して常温下で２００〜４００〔kgf／cm2〕の圧力
で予備成形を行った後、これを１５０〜１７０〔℃〕の
温度，３００〜５００〔kgf／cm2〕の圧力で、全体の硬
さを調整しながら加熱圧縮成形し、その後、アフターキ
ュアとして常圧下で１５０〜３００〔℃〕程度加熱して
硬化させ、本発明に係わる「実施例〜」のブレーキ
摩擦材を得た。(2) The above materials were blended as shown in the table of FIG. 1, further mixed and dried, and then put into a predetermined mold and 200 to 400 [kgf / cm 2 at room temperature. ] Pre-molding was performed at a pressure of 150 to 170 [° C.] and a pressure of 300 to 500 [kgf / cm 2 ], followed by heat compression molding while adjusting the overall hardness, and then As after-cure, the brake friction material of "Example-" according to the present invention was obtained by heating and curing under normal pressure for about 150 to 300 [° C].
【０００９】なお、本発明に係わる「実施例〜」の
ブレーキ摩擦材は、図１の成分表を参照してわかるよう
に、基材である銅繊維が１０〜３０重量％、摩擦調整材
であるカシュー樹脂が５〜２０重量％それぞれ含有さ
れ、かつ摩擦材の硬さであるＨＲＳが５０以下に設定さ
れたものである。また、図１の表に示す摩擦材の硬さＨ
ＲＳは、『乗用車ブレーキ装置ダイナモメータ試験方法
（社団法人、自動車技術会規格ＪＡＳＯ Ｃ−４４４−
７８）』に従って試験されたものである。The brake friction materials of "Examples" according to the present invention, as can be seen by referring to the composition table of FIG. Each cashew resin is contained in an amount of 5 to 20% by weight, and the hardness of the friction material, HRS, is set to 50 or less. Also, the hardness H of the friction material shown in the table of FIG.
RS is "passenger car brake device dynamometer test method (corporate body, Japan Society of Automotive Engineers JASO C-444
78) ”.
【００１０】更に、上記「実施例〜」と比較するた
めのブレーキ摩擦材を「比較例〜」として作成し
た。なお、これら「比較例〜」のブレーキ摩擦材
は、「実施例〜」と同様の材料、工程により作成し
たものであるが、以下の点で「実施例〜」とは異な
っている。すなわち、「比較例・」のブレーキ摩擦
材は、基材である銅繊維をそれぞれ５重量％、４０重量
％含有するものであって、銅繊維を含有する割合が１０
〜３０重量％である「実施例〜」のブレーキ摩擦材
からは範囲が外れたものである。また、「比較例」の
ブレーキ摩擦材は、摩擦調整材であるカシュー樹脂を全
く含有せず、「比較例」のブレーキ摩擦材は、摩擦調
整材であるカシュー樹脂を３０重量％含有するものであ
って、カシュー樹脂を含有する割合が５〜２０重量％で
ある「実施例〜」のブレーキ摩擦材からは範囲が外
れたものである。また、「比較例」のブレーキ摩擦材
は、「実施例」と成分が同じで、かつ硬度を示すＨＲ
Ｓが６３に設定されたものであり、ＨＲＳが５０以下の
「実施例〜」からは設定範囲が外れるものである。Further, a brake friction material for comparison with the above "Examples" was prepared as "Comparative Examples". The brake friction materials of "Comparative Examples-" are prepared by using the same materials and processes as those of "Examples-", but are different from "Examples-" in the following points. That is, the brake friction material of “Comparative Example” contains 5% by weight and 40% by weight of the copper fiber as the base material, and the content of the copper fiber is 10% by weight.
It is out of the range from the brake friction material of "Example-" which is -30% by weight. The brake friction material of "Comparative Example" contains no cashew resin which is a friction adjusting material, and the brake friction material of "Comparative Example" contains 30% by weight of cashew resin which is a friction adjusting material. That is, the range is out of the range of the brake friction material of "Example" in which the proportion of cashew resin is 5 to 20% by weight. Further, the brake friction material of "Comparative Example" has the same composition as that of "Example" and has an HR showing hardness.
S is set to 63, and the setting range is out of the range of "Example-" in which HRS is 50 or less.
【００１１】そして、上記のように作製した「実施例
〜」及び「比較例〜」のブレーキ摩擦材の摩擦係
数μ及び耐摩耗性を、『乗用車ブレーキ装置ダイナモメ
ータ試験方法（社団法人、自動車技術会規格ＪＡＳＯ
Ｃ−４０６−８２）』に従って試験し、これらの試験結
果を図２の表にまとめた。なお、この図２において、第
１，第２，第３効力試験は、上記『乗用車ブレーキ装置
ダイナモメータ試験方法』 の試験項目順序のＮｏ.３、
Ｎｏ.５、Ｎｏ.１２にそれぞれ基づく試験であり、ま
た、第１，第２フェード試験は、上記『乗用車ブレーキ
装置ダイナモメータ試験方法』の試験項目順序のＮｏ.
８とＮｏ.１０にそれぞれ基づく試験である。また、耐
摩耗性については、『乗用車ブレーキ装置ダイナモメー
タ試験方法』の試験項目順序のＮｏ.１５ に示す「最終
計測及び点検」において測定されるものであって、初期
計測からどれほど摩耗したかを示す値が測定結果として
記載されている。（上記試験項目順序の詳細について
は、上記ＪＡＳＯ Ｃ−４０６−８２を参照のこと。）Then, the friction coefficient μ and wear resistance of the brake friction materials of "Examples ~" and "Comparative Examples ~" produced as described above are determined by the "passenger car brake device dynamometer test method (corporate corporation, automobile technology). Society Standard JASO
C-406-82) ”and the test results are summarized in the table of FIG. In addition, in FIG. 2, the first, second, and third efficacy tests are No. 3 in the test item order of “Passenger car brake device dynamometer test method”,
It is a test based on No. 5 and No. 12, respectively, and the first and second fade tests are Nos. In the test item order of the "passenger car brake device dynamometer test method".
It is a test based on No. 8 and No. 10, respectively. In addition, wear resistance is measured in "Final measurement and inspection" shown in No. 15 of the test item sequence in "Passenger car brake dynamometer test method". The indicated value is described as the measurement result. (See JASO C-406-82 above for details of the test item order above.)
【００１２】一方、「実施例〜」及び「比較例〜
」のブレーキ摩擦材について、制動時の異音（スキー
ル音）を測定し、この測定結果を摩擦係数μ及び耐摩耗
性と同様、図２の表にまとめた。この異音の測定方法と
しては、まず、実車の足まわりを用いた試験機にて、デ
ィスクロータの温度を数段階に設定し、それぞれの温度
について、ブレーキ液圧を数段階に変化させて、一定速
度から合計で３０００回の制動を繰り返した場合の異音
の発生回数を割合〔％〕で表し、これを異音発生頻度と
して図２の表にまとめた。On the other hand, "Examples" and "Comparative Examples"
2) abnormal noise (squeal noise) during braking was measured, and the measurement results are summarized in the table of FIG. 2 in the same manner as the friction coefficient μ and wear resistance. As a method of measuring this abnormal noise, first, with a tester using the suspension of an actual vehicle, the temperature of the disk rotor is set in several stages, and the brake fluid pressure is changed in several stages for each temperature, The number of times abnormal noise is generated when a total of 3000 brakings are repeated from a constant speed is expressed as a percentage [%], and this is summarized in the table of FIG. 2 as the abnormal noise generation frequency.
【００１３】以下、図１〜図３を参照して、「実施例
〜」のブレーキ摩擦材と「比較例〜」のブレーキ
摩擦材とを比較して考察する。そして、図１の成分表と
図２の試験結果とを参照比較してわかるように、「実施
例〜」のブレーキ摩擦材では、効力試験時の摩擦係
数μが０.３〜０.４５の適正範囲内にあって安定し、ま
た、フェード試験時の摩擦係数μについても、従来のブ
レーキ摩擦材と同等の０.１８ 以上と安定しており、ま
た、摩耗量については０.６８〔ｍｍ〕 以下であって耐
摩耗性に優れ、更に、異音発生頻度も３.０〔％〕以下
と非常に低い値となることが確認された。これに対し
て、基材である銅繊維を５重量％しか含有しない「比較
例」のブレーキ摩擦材では、熱履歴後の第３効力試験
時の摩擦係数μが０.２１〜０.３０と低く、また、基材
である銅繊維を４０重量％含有する「比較例」のブレ
ーキ摩擦材では、第１フェード試験時の摩擦係数μの最
低値が０.１ と低く、ブレーキ力が低下することが確認
された。Hereinafter, referring to FIGS. 1 to 3, the brake friction materials of “Examples” and “Comparative Examples” will be compared and considered. As can be seen by comparing and comparing the composition table of FIG. 1 and the test results of FIG. 2, in the brake friction materials of “Examples”, the friction coefficient μ in the effectiveness test is 0.3 to 0.45. It is stable within the proper range, and the friction coefficient μ during the fade test is stable at 0.18 or more, which is equivalent to that of the conventional brake friction material, and the wear amount is 0.68 mm. It was confirmed that the abrasion resistance was not more than that, and the abrasion resistance was excellent, and the occurrence frequency of abnormal noise was 3.0 [%] or less, which was a very low value. On the other hand, in the case of the "comparative example" brake friction material containing only 5% by weight of the copper fiber as the base material, the friction coefficient μ in the third efficacy test after thermal history was 0.21 to 0.30. In addition, in the case of the "comparative example" brake friction material containing 40% by weight of the copper fiber as the base material, the minimum value of the friction coefficient μ in the first fade test is as low as 0.1, and the braking force decreases. It was confirmed.
【００１４】また、摩擦調整材であるカシュー樹脂を全
く含まない「比較例」のブレーキ摩擦材では、第１効
力試験、第２効力試験時の各摩擦係数μが０.２６〜０.
３８、０.２０〜０.３４ と範囲に幅があって不安定で
あり、かつ異音発生頻度も３０.０〔％〕と高い頻度で
異音が発生することが確認された。また、摩擦調整材で
あるカシュー樹脂を３０重量％と多量に含む「比較例
」のブレーキ摩擦材では、第３効力試験時の摩擦係数
μが０.２３〜０.３７と範囲に幅があって不安定であ
り、摩耗量も２.５０〔ｍｍ〕と異常に高くなり、かつ
異音発生頻度も１０.０〔％〕と高い頻度で異音が発生
することが確認された。すなわち、以上のような「実施
例〜」と「比較例〜」との比較結果から、銅繊
維を１０〜３０重量％含有し、かつカシュー樹脂を５〜
２０重量％含有する「実施例〜」のブレーキ摩擦材
では、効力試験時の摩擦係数μが０.３〜０.４５、フェ
ード試験時の摩擦係数μが０.１８以上と安定し、かつ
摩耗量についても０.６８〔ｍｍ〕 以下であって耐摩耗
性にも優れることが確認された。Further, in the "comparative example" brake friction material containing no cashew resin as a friction adjusting material, each friction coefficient μ in the first effect test and the second effect test was 0.26 to 0.2.
It was confirmed that there was a range of 38, 0.20 to 0.34, which was unstable, and the frequency of abnormal noise was as high as 30.0%, and abnormal noise was generated at a high frequency. Further, in the case of the brake friction material of "Comparative Example" containing a large amount of 30% by weight of cashew resin as the friction adjusting material, the friction coefficient μ in the third efficacy test has a range of 0.23 to 0.37. It was confirmed that the noise was abnormally high, the wear amount was abnormally high at 2.50 [mm], and the abnormal sound frequency was as high as 10.0 [%]. That is, from the results of comparison between the above "Examples ~" and "Comparative Examples ~", the content of copper fibers is 10 to 30% by weight, and the cashew resin is 5 to 5.
In the brake friction material of "Example-" containing 20% by weight, the friction coefficient μ in the efficacy test is 0.3 to 0.45, the friction coefficient μ in the fade test is 0.18 or more, and the wear is stable. It was also confirmed that the amount was 0.68 [mm] or less, and the abrasion resistance was excellent.
【００１５】一方、「実施例」と成分が同じで、かつ
硬度ＨＲＳが６３に設定された「比較例」のブレーキ
摩擦材では、異音発生頻度が１０.０〔％〕 と高い頻度
で異音が発生することが確認された。すなわち、これら
「実施例」と「比較例」との比較から、摩擦材の硬
度ＨＲＳがブレーキ摩擦材の異音発生頻度と関係してい
ると推定することができ、更にこの推定を裏付けるべ
く、「実施例」と成分比を同じにして、硬さを異なら
せた複数のブレーキ摩擦材を作製し、それぞれのブレー
キ摩擦材について、制動時の異音を測定した。そして、
これら異音の測定の結果を示す図３を参照してわかるよ
うに、ブレーキ摩擦材の硬度ＨＲＳが高くなるに従っ
て、異音発生頻度が高くなり、特に、硬度ＨＲＳが５０
を越えた場合には、異音発生頻度が５〔％〕以上と高い
頻度で異音が発生することが確認された。On the other hand, in the brake friction material of the "comparative example" having the same composition as that of the "example" and having the hardness HRS set to 63, the abnormal noise occurrence frequency is as high as 10.0 [%]. It was confirmed that sound was generated. That is, from the comparison between these "Examples" and "Comparative Examples", it can be estimated that the hardness HRS of the friction material is related to the frequency of noise generation in the brake friction material. To further support this estimation, A plurality of brake friction materials having different hardnesses were prepared with the same composition ratio as in "Example", and abnormal noise during braking was measured for each brake friction material. And
As can be seen from FIG. 3 showing the results of these abnormal noise measurements, the higher the hardness HRS of the brake friction material, the higher the abnormal noise occurrence frequency, and especially the hardness HRS of 50.
It has been confirmed that when the value exceeds the range, the abnormal noise occurs at a high frequency of 5% or more.
【００１６】[0016]
【発明の効果】以上詳細に説明したようにこの発明によ
れば、銅繊維を１０〜３０重量％含有させ、かつカシュ
ー樹脂を５〜２０重量％含有させることにより、効力試
験時及びフェード試験時の摩擦係数を適正範囲内とする
ことができ、かつ耐摩耗性の向上も図ることができ、更
に、硬度ＨＲＳを５０以下に調整することによって、異
音発生頻度を低く抑えることが可能となる。具体的に
は、銅繊維を１０〜３０重量％含有し、かつカシュー樹
脂を５〜２０重量％含有する「実施例〜」のブレー
キ摩擦材では、効力試験時の摩擦係数μが０.３〜０.４
５、フェード試験時の摩擦係数μが０.１８ 以上と安定
し、かつ効力試験時及びフェード試験時の摩擦係数μの
範囲についてもばらつきが無く、一方、摩耗量について
は０.６８〔ｍｍ〕 以下であって耐摩耗性に優れること
が確認され、更に、硬度ＨＲＳを５０以下に調整するこ
とによって、異音発生頻度も５.０〔％〕以下と非常に
低い値となることが確認された。As described in detail above, according to the present invention, by containing 10 to 30% by weight of copper fiber and 5 to 20% by weight of cashew resin, it is possible to perform the effect test and the fade test. The friction coefficient can be within an appropriate range, the wear resistance can be improved, and by adjusting the hardness HRS to 50 or less, it is possible to suppress the frequency of abnormal noise generation. . Specifically, in the brake friction material of "Example-" containing 10 to 30% by weight of copper fibers and 5 to 20% by weight of cashew resin, the friction coefficient μ in the efficacy test is 0.3 to. 0.4
5. The coefficient of friction μ in the fade test is stable at 0.18 or more, and there is no variation in the range of the coefficient of friction μ in the efficacy test and the fade test, while the wear amount is 0.68 [mm]. It was confirmed that the abrasion resistance was excellent, and further, by adjusting the hardness HRS to 50 or less, the occurrence frequency of abnormal noise was also confirmed to be a very low value of 5.0 [%] or less. It was
【図１】図１は本発明に係る「実施例〜」のブレー
キ摩擦材と、「比較例〜」のブレーキ摩擦材との成
分を示す表。FIG. 1 is a table showing components of a brake friction material of “Example” and a brake friction material of “Comparative Example” according to the present invention.
【図２】図１のブレーキ摩擦材をブレーキ試験した結果
を示す表。FIG. 2 is a table showing the results of a brake test of the brake friction material of FIG.
【図３】硬度ＨＲＳと異音発生頻度との関係を示すグラ
フ。FIG. 3 is a graph showing the relationship between hardness HRS and the frequency of abnormal noise.
Claims (1)
調整材などを配合して得られるブレーキ摩擦材におい
て、 前記基材の一部に銅繊維を用い、この銅繊維が１０〜３
０重量％の割合で含有され、 前記摩擦調整材の一部にカシュー樹脂を用い、このカシ
ュー樹脂が５〜２０重量％の割合で含有され、 全体の硬さをＨＲＳで５０以下に調整したことを特徴と
するブレーキ摩擦材。1. A brake friction material obtained by blending a base material with a lubricant, a filler, a binder, a friction modifier, etc., wherein copper fiber is used as a part of the base material, and the copper fiber is 10 ~ 3
It is contained at a ratio of 0% by weight, cashew resin is used as a part of the friction modifier, and the cashew resin is contained at a ratio of 5 to 20% by weight, and the total hardness is adjusted to 50 or less by HRS. Brake friction material characterized by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17347892A JPH0617030A (en) | 1992-06-30 | 1992-06-30 | Brake friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17347892A JPH0617030A (en) | 1992-06-30 | 1992-06-30 | Brake friction material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0617030A true JPH0617030A (en) | 1994-01-25 |
Family
ID=15961241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17347892A Withdrawn JPH0617030A (en) | 1992-06-30 | 1992-06-30 | Brake friction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617030A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0856030A4 (en) * | 1995-10-18 | 1999-11-17 | Alcell Tech Inc | Lignin-based friction material |
| JP2014189691A (en) * | 2013-03-28 | 2014-10-06 | Hitachi Automotive Systems Ltd | Brake friction material |
| WO2018163256A1 (en) | 2017-03-06 | 2018-09-13 | 日立化成株式会社 | Friction material composition, friction material, and friction member |
| CN113004867A (en) * | 2021-02-23 | 2021-06-22 | 山东金麒麟股份有限公司 | Environment-friendly friction material, high-speed rail brake pad and preparation method |
-
1992
- 1992-06-30 JP JP17347892A patent/JPH0617030A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0856030A4 (en) * | 1995-10-18 | 1999-11-17 | Alcell Tech Inc | Lignin-based friction material |
| JP2014189691A (en) * | 2013-03-28 | 2014-10-06 | Hitachi Automotive Systems Ltd | Brake friction material |
| WO2018163256A1 (en) | 2017-03-06 | 2018-09-13 | 日立化成株式会社 | Friction material composition, friction material, and friction member |
| US11649869B2 (en) | 2017-03-06 | 2023-05-16 | Resonac Corporation | Friction material composition, friction material, and friction member |
| CN113004867A (en) * | 2021-02-23 | 2021-06-22 | 山东金麒麟股份有限公司 | Environment-friendly friction material, high-speed rail brake pad and preparation method |
| CN113004867B (en) * | 2021-02-23 | 2022-03-04 | 山东金麒麟股份有限公司 | Environment-friendly friction material, high-speed rail brake pad and preparation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990831 |