JP2818326B2 - Friction material - Google Patents
Friction materialInfo
- Publication number
- JP2818326B2 JP2818326B2 JP3203835A JP20383591A JP2818326B2 JP 2818326 B2 JP2818326 B2 JP 2818326B2 JP 3203835 A JP3203835 A JP 3203835A JP 20383591 A JP20383591 A JP 20383591A JP 2818326 B2 JP2818326 B2 JP 2818326B2
- Authority
- JP
- Japan
- Prior art keywords
- friction material
- friction
- fade
- brake
- recovery rate
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は摩擦材に関し、更に詳細
には車両用ブレーキに使用される摩擦材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material, and more particularly to a friction material used for a vehicle brake.
【０００２】[0002]
【従来の技術】従来から車両のドラムブレーキやディス
クブレーキ等のブレーキには、金属粉、無機充填材、有
機充填材、結合材の材料が混合されて成る摩擦材が使用
されている。この摩擦材は、通常、金属製プレート等の
基体に結着されてブレーキを構成する。かかる摩擦材
は、車両の制動時に、ドラムブレーキのドラムやディス
クブレーキのディスクと接触し、所定の制動力を生じさ
せる。この際に、摩擦熱が発生し、摩擦材の表面温度が
数１００℃、瞬間的には約１２００℃にも達する。この
様な熱が摩擦材中に次第に蓄積されると、摩擦材の摩擦
係数が著しく低下する、いわゆるフェード現象が発生す
る。従来の摩擦材においては、一旦、フェード現象が発
生すると、ブレーキの制動力が著しく低下することは勿
論のことであるが、摩擦材を冷却して蓄積した熱を除去
することによって摩擦材の摩擦係数もある程度回復す
る。しかし、その回復の程度は不充分であるため、ブレ
ーキ制動力が不充分となることがある。かかる従来の摩
擦材に対して、特開昭５１ー８７５４９号公報におい
て、ガラス短繊維が含有された摩擦材が提案されてい
る。BACKGROUND OF THE INVENTION brake, such as a conventional from the vehicle drum brakes or disc brakes, metal powder, inorganic fillers, organic
A friction material obtained by mixing materials of a machine filler and a binder is used. This friction material is usually bound to a base such as a metal plate to constitute a brake. The friction material comes into contact with the drum of the drum brake and the disc of the disc brake during braking of the vehicle, and generates a predetermined braking force. At this time, frictional heat is generated, and the surface temperature of the friction material reaches several hundred degrees centigrade, and instantaneously reaches about 1200 degrees centigrade. When such heat is gradually accumulated in the friction material, a so-called fade phenomenon occurs in which the friction coefficient of the friction material is significantly reduced. In the conventional friction material, once the fade phenomenon occurs, the braking force of the brake is remarkably reduced, but the friction material is cooled by cooling the friction material to remove the accumulated heat. The coefficient recovers to some extent. However, since the degree of the recovery is insufficient, the braking force may be insufficient. In contrast to such a conventional friction material, Japanese Patent Application Laid-Open No. 51-87549 proposes a friction material containing short glass fibers.
【０００３】[0003]
【発明が解決しようとする課題】前記ガラス短繊維が含
有された摩擦材についての本発明者等の追試によれば、
フェード現象が発生した後、摩擦材に冷却処理を施すこ
とに因る摩擦材の摩擦係数の回復率は、従来の摩擦材に
比較して良好な値を示す。しかしながら、このガラス短
繊維含有摩擦材は、その摩擦係数の回復率が依然として
不充分であり、更に一層の回復率の向上が望まれてい
る。しかも、ガラス短繊維含有摩擦材は、高速走行時に
おける摩擦係数が低いという欠点も判明した。According to the present inventors' additional test on the friction material containing the short glass fiber,
After the fading phenomenon occurs, the recovery rate of the friction coefficient of the friction material due to the cooling treatment of the friction material shows a better value than the conventional friction material. However, the recovery rate of the friction coefficient of the friction material containing short glass fibers is still insufficient, and further improvement of the recovery rate is desired. In addition, it has been found that the short glass fiber-containing friction material has a low friction coefficient during high-speed running.
【０００４】そこで、本発明の目的は、高速走行時にお
ける摩擦係数及びフェード現象発生後の摩擦係数の回復
率が共に良好な摩擦材を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a friction material having a good friction coefficient at the time of high-speed running and a good recovery rate of the friction coefficient after the occurrence of a fade phenomenon.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、前記目的
を達成すべく検討した結果、摩擦材中に窒化珪素を混入
することによって、摩擦材の高速走行時における摩擦係
数、及びフェード現象発生後に冷却処理を施した摩擦材
の摩擦係数の回復率（以下、フェード回復率と称するこ
とがある）が共に良好であることを見い出し、本発明に
到達した。すなわち、本発明は、車両用ブレーキに使用
され、金属粉、無機充填材、有機充填材、結合材から成
る摩擦材において、該摩擦材に対して窒化珪素の粉末が
２０〜５０vol ％混入されていることを特徴とする摩擦
材にある。Means for Solving the Problems The present inventors have studied to achieve the above object, and as a result, by mixing silicon nitride into the friction material, the friction coefficient and the fade phenomenon of the friction material at the time of high-speed running are considered. The present inventors have found that the coefficient of recovery of the friction coefficient of the friction material that has been subjected to the cooling treatment after the occurrence (hereinafter, may be referred to as a fade recovery rate) is both good, and has reached the present invention. That is, the present invention is used in a vehicle brake, metal powder, inorganic fillers, organic fillers, in binder or we made friction materials, powder of silicon nitride with respect to the friction material
20 to 50% by volume of a friction material.
【０００６】[0006]
【作用】本発明によれば、摩擦材の高速走行時における
摩擦係数及びフェード回復率が共に良好である。この様
な現象が発現する詳細な理由は未だ明確になっていない
が、次の様に考えられる。つまり、窒化珪素は、その分
解温度が１８００〜１９００℃と高く耐熱性に優れてい
ると共に、耐摩耗性にも優れている。このため、高速走
行している車両の制動時に発生する高摩擦力や摩擦熱等
に因る高温に窒化珪素の粉末が晒されても、窒化珪素粉
末の変形や分解ガスを発生することがない。その結果、
高速走行時の摩擦係数が高く且つフェード回復率を共に
良好にできるのである。According to the present invention, the friction coefficient and the fade recovery rate of the friction material during high-speed running are both good. Although the detailed reason why such a phenomenon occurs is not yet clear, it is considered as follows. That is, silicon nitride has a high decomposition temperature of 1800 to 1900 ° C., and is excellent in heat resistance and also has excellent wear resistance. Therefore, even when the silicon nitride powder is exposed to a high temperature due to a high frictional force or frictional heat generated during braking of a vehicle running at high speed, the silicon nitride powder does not deform or generate decomposition gas. . as a result,
The coefficient of friction during high-speed running is high, and the fade recovery rate can both be improved.
【０００７】[0007]
【発明の構成】本発明の摩擦材は、自動車等の車両に用
いられるドラムブレーキやディスクブレーキに使用され
る摩擦材であり、金属粉、無機充填材、有機充填材、結
合材から成る。かかる摩擦材は、所定の形状に成形され
た後、金属製のブレーキシューやプレートに固着され
る。本発明においては、所定の形状に成形された摩擦材
中に窒化珪素 (Si3N4)の粉末が含有されていることが大
切である。かかる窒化珪素の含有量は、成形された摩擦
材に対して２０〜５０vol ％とする。窒化珪素の含有量
が２０vol ％未満である場合、高速走行における摩擦係
数及びフェード回復率の向上幅が少なくなる。一方、窒
化珪素の含有量が５０vol％を越える場合には、高速走
行における摩擦係数及びフェード回復率の向上幅が飽和
に達する。本発明の摩擦材を形成する金属粉等の材料
は、従来から使用されいるものを使用することができ、
例えは金属粉としての鉄粉や銅粉、無機充填材としての
黒鉛、酸化アンチモン、硫酸バリウム、有機充填材とし
てのアラミド繊維、結合材としての熱硬化性樹脂を使用
することができる。尚、熱硬化性樹脂としては、ノボラ
ック系フェノール樹脂、レゾール系フェノール樹脂等の
フェノール樹脂を好ましく使用できる。Friction material of the present invention DETAILED DESCRIPTION OF THE INVENTION, a friction material for use in a drum brake or a disc brake for use in a vehicle such as an automobile, a metal powder, an inorganic filler, an organic filler, comprising a binder or al. After being formed into a predetermined shape, the friction material is fixed to a metal brake shoe or plate. In the present invention, it is important that the friction material formed into a predetermined shape contains silicon nitride (Si 3 N 4 ) powder. The content of the silicon nitride shall be the 20～50Vol% relative molded friction material. When the content of silicon nitride is less than 20 vol%, increase the width of the friction coefficient and fade recovery rate in high-speed running may turn less. On the other hand, when the amount of silicon nitride exceeds 50 vol%, the improvement width of the friction coefficient and fade recovery rate in high-speed travel is reached saturation. Materials such as metal powder forming the friction material of the present invention may be those conventionally used,
For example, iron powder or copper powder as a metal powder, graphite, antimony oxide, barium sulfate as an inorganic filler, aramid fiber as an organic filler, and a thermosetting resin as a binder can be used. As the thermosetting resin, a phenol resin such as a novolak phenol resin and a resol phenol resin can be preferably used.
【０００８】本発明の摩擦材は、従来の摩擦材において
採用されている製造方法、例えば特開平３ー５６７２７
号公報において提案されている摩擦材の製造方法を採用
することができる。先ず、金属粉、無機充填材、有機充
填材、結合材の材料と窒化珪素の粉末とを混合、計量、
及び予備成形する。次いで、予備成形した摩擦材と金属
製のブレーキシューやプレート等の基体とを加熱・加圧
成形し、結合材によって金属粉や有機充填材等を強固に
結合すると共に、基体と摩擦材とを一体に結着する。
尚、加熱・加圧成形における温度としては、１６０〜１
７０℃程度とすることが好ましい。更に、基体と摩擦材
との結着強度を向上するため、１８０〜２３０℃程度に
保持されている熱風炉で約９時間程焼成する。その後、
摩擦材の表面を研磨する研磨加工、塗装等の後加工を必
要に応じて施してもよい。[0008] The friction material of the present invention can be produced by a manufacturing method employed in conventional friction materials, for example, Japanese Patent Application Laid-Open No. 3-56727.
The method for manufacturing a friction material proposed in Japanese Patent Application Laid-Open Publication No. H10-209556 can be adopted. First, a metal powder, an inorganic filler, mixed organic filler, and a powder material and the silicon nitride of the binder, metering,
And preforming. Next, the preformed friction material and a base such as a metal brake shoe and a plate are formed by heating and pressing, and the metal powder and the organic filler are firmly bonded by a bonding material. Bind together.
The temperature in the heat and pressure molding is 160 to 1
Preferably, the temperature is about 70 ° C. Further, in order to improve the bonding strength between the base and the friction material, the sintering is performed for about 9 hours in a hot blast furnace maintained at about 180 to 230 ° C. afterwards,
Post-processing such as polishing and painting for polishing the surface of the friction material may be performed as necessary.
【０００９】[0009]
実施例及び比較例 下記に示す材料を用い、特開平３ー５６７２７号公報に
記載されている摩擦材の製造方法と同様の製造方法によ
って、金属製のプレートに摩擦材が結着されたディスク
ブレーキ用のブレーキパッドを作成した。 フェノール樹脂 ２０vol ％ アラミド短繊維 １５vol ％ 金属粉 １０vol ％ 潤滑剤 １５vol ％ 窒化珪素粉末 ３０vol ％ 無機充填材 １０vol ％ 得られたブレーキパッドを用いてＪＩＳーＤ４４１１ブ
レーキライニング試験法によって、高速走行時のブレー
キパッドの摩擦係数及びフェード回復率を測定し、その
結果を図１（高速走行時における摩擦係数）及び図２
（フェード回復率）に示した。尚、ブレーキパッドのフ
ェード回復率を示す図２には、フェード現象発生前（フ
ェード前）及びフェード現象発生時（フェード時）に測
定したブレーキパッドの摩擦係数値、フェード現象発生
後にブレーキパッドを冷却した時点（冷却後）で測定し
たブレーキパッドの摩擦係数値を示した。また、比較例
として、実施例の窒化珪素粉末に代えてガラス短繊維を
用いた他は実施例と同様にブレーキパッドを製造した。
得られた比較例のブレーキパッドについても高速走行時
における摩擦係数及びフェード回復率を測定し、その結
果を図１及び図２に併記した。図１及び図２から明らか
な様に、窒化珪素粉末を含有する摩擦材が結着されたブ
レーキパッドの高速走行時における摩擦係数及びフェー
ド回復率は、ガラス短繊維を含有する従来の摩擦材が結
着されたブレーキパッドに比較して共に良好であること
が判る。Examples and Comparative Examples Disc brakes in which a friction material is bonded to a metal plate by the same method as the method for producing a friction material described in JP-A-3-56727 using the materials shown below. Brake pads were created. Phenol resin 20vol% Aramid short fiber 15vol% Metal powder 10vol% Lubricant 15vol% Silicon nitride powder 30vol% Inorganic filler 10vol% Using the obtained brake pads, brake pads during high-speed running according to JIS-D4411 brake lining test method. The coefficient of friction and the fade recovery rate were measured, and the results were shown in FIG. 1 (friction coefficient at high speed running) and FIG.
(Fade recovery rate). FIG. 2 shows the fade recovery rate of the brake pad. FIG. 2 shows the friction coefficient value of the brake pad measured before the occurrence of the fade phenomenon (before the fade) and at the time of the fade phenomenon (at the time of the fade). The values of the coefficient of friction of the brake pad measured at the time when the cooling was performed (after cooling) are shown. Further, as a comparative example, a brake pad was manufactured in the same manner as in the example except that short glass fibers were used instead of the silicon nitride powder of the example.
With respect to the obtained brake pad of the comparative example, the friction coefficient and the fade recovery rate during high-speed running were measured, and the results are shown in FIGS. 1 and 2. As is clear from FIGS. 1 and 2, the friction coefficient and the fade recovery rate of the brake pad to which the friction material containing the silicon nitride powder is bound during high-speed running are lower than those of the conventional friction material containing the short glass fiber. It turns out that both are good compared with the bonded brake pad.
【００１０】[0010]
【発明の効果】本発明の摩擦材によれば、高速走行時に
おける摩擦係数及びフェード回復率が良好であるため、
高速走行している車両の安全性を確保することができ
る。According to the friction material of the present invention, since the friction coefficient and the fade recovery rate during high-speed running are good,
Safety of a vehicle running at high speed can be ensured.
【図１】本発明に係る摩擦材の高速走行時における摩擦
係数値を示すグラフである。FIG. 1 is a graph showing a friction coefficient value of a friction material according to the present invention during high-speed running.
【図２】本発明に係る摩擦材のフェード回復率を示すグ
ラフである。FIG. 2 is a graph showing a fade recovery rate of the friction material according to the present invention.
Claims (1)
機充填材、有機充填材、結合材から成る摩擦材におい
て、 該摩擦材に対して窒化珪素の粉末が２０〜５０vol ％混
入されていることを特徴とする摩擦材。1. A used in the vehicle brake, metal powder, inorganic fillers, organic fillers, in binder or we made friction materials, powder of silicon nitride with respect to the friction material are mixed 20～50Vol% Friction material characterized by that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3203835A JP2818326B2 (en) | 1991-07-18 | 1991-07-18 | Friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3203835A JP2818326B2 (en) | 1991-07-18 | 1991-07-18 | Friction material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0526271A JPH0526271A (en) | 1993-02-02 |
| JP2818326B2 true JP2818326B2 (en) | 1998-10-30 |
Family
ID=16480494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3203835A Expired - Fee Related JP2818326B2 (en) | 1991-07-18 | 1991-07-18 | Friction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2818326B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2851225B2 (en) * | 1993-06-30 | 1999-01-27 | 大同メタル工業株式会社 | Friction material |
| KR100350332B1 (en) * | 1993-09-23 | 2002-11-14 | 보그-워너 인코포레이티드 | Unsaturated friction materials containing powdered silicone resins and powdered phenolic resins and methods for preparing the same |
| US5775468A (en) * | 1997-01-16 | 1998-07-07 | Borg-Warner Automotive, Inc. | High performance two-ply friction material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5844139B2 (en) * | 1976-02-11 | 1983-10-01 | 住友電気工業株式会社 | Sintered alloy friction material |
| JPS58163835A (en) * | 1982-03-23 | 1983-09-28 | Sumitomo Electric Ind Ltd | High-energy load disc brake |
-
1991
- 1991-07-18 JP JP3203835A patent/JP2818326B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0526271A (en) | 1993-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2647164B2 (en) | Friction material | |
| EP1482203B1 (en) | Friction material | |
| JP2818326B2 (en) | Friction material | |
| JPH05117783A (en) | Dry friction material | |
| JP4412475B2 (en) | Friction material | |
| JP2806499B2 (en) | Friction material | |
| KR101035240B1 (en) | A low-steel type friction material and a brake for vehicle comprising the low-steel type friction material | |
| JPH05247441A (en) | Friction material | |
| JPH10330732A (en) | Friction material composition and friction material made therefrom | |
| JP2000178538A (en) | Friction material composition and friction material made by using the composition | |
| JPH05255657A (en) | Friction material | |
| JP2709124B2 (en) | Friction material | |
| JP2000319635A (en) | Friction material composition and friction material using this | |
| JP3228096B2 (en) | Manufacturing method of friction material | |
| JP3838529B2 (en) | Non-asbestos friction material | |
| JPS6312098B2 (en) | ||
| JP2696215B2 (en) | Asbestos-free friction material | |
| JPH08209115A (en) | Friction material composition for brake pad | |
| JPH03239784A (en) | Friction material composition and manufacture of friction material therefrom | |
| JP2541641B2 (en) | Friction material manufacturing method | |
| JP3632716B2 (en) | Friction material composition | |
| JPH10130627A (en) | Friction material composition and production of friction material therefrom | |
| JP2000319409A (en) | Friction material | |
| JPH05247442A (en) | Friction material | |
| JPS63280936A (en) | Friction material for disc brake |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080821 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080821 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090821 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100821 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |