JPH07113387B2 - Disc brake pad - Google Patents
Disc brake padInfo
- Publication number
- JPH07113387B2 JPH07113387B2 JP20519587A JP20519587A JPH07113387B2 JP H07113387 B2 JPH07113387 B2 JP H07113387B2 JP 20519587 A JP20519587 A JP 20519587A JP 20519587 A JP20519587 A JP 20519587A JP H07113387 B2 JPH07113387 B2 JP H07113387B2
- Authority
- JP
- Japan
- Prior art keywords
- porosity
- disc brake
- friction material
- lower layer
- layer
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/002—Combination of different friction materials
Description
【発明の詳細な説明】 a. 発明の目的 （産業上の利用分野） この発明は、自動車の制動に用いられるディスクブレー
キに組み込まれ、制動時には車輪と共に回転するロータ
に押圧されるパッドの改良に関し、摩擦材の摩耗量を多
くする事なく、制動時に於ける騒音の発生を低く抑える
事を目的としている。DETAILED DESCRIPTION OF THE INVENTION a. Object of the Invention (Industrial field of application) The present invention relates to an improvement of a pad which is incorporated in a disc brake used for braking an automobile and which is pressed by a rotor that rotates together with a wheel during braking. The purpose is to suppress the generation of noise during braking without increasing the wear amount of the friction material.
（従来の技術） 自動車の制動を行なう為に、ディスクブレーキが広く使
用されているが、この様なディスクブレーキにはパッド
が組み込まれて、制動時にはこのパッドの摩擦材を、車
輪と共に回転するロータに向けて強く押圧する様にして
いる。(Prior Art) Disc brakes are widely used for braking automobiles, but pads are incorporated in such disc brakes, and the friction material of the pads is rotated together with the wheels during braking. It is designed to be pressed strongly toward.
パッドは、鋼板等の金属厚板製の裏金の表面に、無機、
有機金属の補強繊維充填材、摩擦調整材等の焼成材から
成る摩擦材を添着する事で構成されている。The pad is made of an inorganic,
It is configured by affixing a friction material made of a firing material such as a reinforcing fiber filler of organic metal and a friction modifier.
ところで、この様なディスクブレーキ用パッドは、制動
時に於いては車輪と共に回転するロータに強く押し付け
られるが、この際、摩擦材とロータとの摩擦に伴なって
パッドが振動し、この振動に起因して、所謂鳴きと呼ば
れる騒音がしばしば発生する。By the way, such a disc brake pad is strongly pressed against the rotor that rotates together with the wheel during braking, but at this time, the pad vibrates due to the friction between the friction material and the rotor, which causes the vibration. Then, a so-called noise is often generated.
この様な騒音の発生を防止する為、特開昭56−167929号
公報には、摩擦材の表面層部分の気孔率（空隙部分が見
かけ容積に占める割合を容量％で表わしたもの）を大き
くする発明が開示されている。In order to prevent such noise generation, JP-A-56-167929 discloses that the porosity of the surface layer portion of the friction material (the ratio of the void portion to the apparent volume in volume%) is increased. An invention is disclosed.
即ち、第４図に示す様に、金属厚板製の裏金１の表面に
添着する摩擦材２を、この裏金１の表面に直接接触する
下層３と、この下層３の表面に添着される表面層４との
２層構造とし、上記表面層４の気孔率を10〜25％と大き
くし、下層３の気孔率を３〜15％と表面層４の気孔率よ
りも小さくしたものである。That is, as shown in FIG. 4, the friction material 2 attached to the surface of the backing plate 1 made of a metal thick plate, the lower layer 3 which is in direct contact with the surface of the backing plate 1, and the surface attached to the surface of the lower layer 3 It has a two-layer structure with the layer 4, and the surface layer 4 has a large porosity of 10 to 25% and the lower layer 3 has a porosity of 3 to 15%, which is smaller than the surface layer 4.
（発明が解決しようとする問題点） ところが、上述の様に構成される従来のディスクブレー
キ用パッドの場合、次に述べる様な不都合を生じる。(Problems to be Solved by the Invention) However, in the case of the conventional disc brake pad configured as described above, the following inconvenience occurs.
即ち、摩擦材表面層４の気孔率を大きくすると、制動時
に騒音が発生し難くなる反面、制動時に於けるロータと
の摩擦に基づく摩擦材２の摩耗量が増大してしまう。That is, if the porosity of the friction material surface layer 4 is increased, noise is less likely to be generated during braking, but the amount of wear of the friction material 2 due to friction with the rotor during braking is increased.
本発明者の実験によると、摩擦材２の表面層４の気孔率
を第５図の横軸に示す様に、５〜20％の範囲で変化させ
た場合、制動時に於ける騒音の発生率は、同図に実線ａ
で示す様に気孔率の増大と共に減少するが、摩擦材２の
摩耗量は、同図に破線ｂで示す様に、気孔率の増大と共
に増大する事が解った。According to an experiment conducted by the inventor, when the porosity of the surface layer 4 of the friction material 2 is changed in the range of 5 to 20% as shown on the horizontal axis of FIG. Is the solid line a in the figure.
It was found that the wear amount of the friction material 2 increases with the increase of the porosity, as shown by the broken line b in FIG.
摩擦材２の摩耗量が増大する事は、パッドの寿命短縮に
結び付く為好ましくない。An increase in the amount of wear of the friction material 2 leads to shortening of the life of the pad, which is not preferable.
本発明のディスクブレーキ用パッドは、上述の様な不都
合を解消するものである。The disc brake pad of the present invention eliminates the above-mentioned inconvenience.
b. 発明の構成 （問題を解決するための手段） ディスクブレーキ用パッドに関する本発明は、本発明者
の実験により、摩擦材の内に気孔率の大きな部分が存在
すれば、この部分が直接ロータと接触しなくても、制動
時に於ける騒音の発生を抑えられる事が解って成された
ものである。b. Structure of the Invention (Means for Solving the Problem) According to the present invention, which relates to a disc brake pad, according to an experiment conducted by the present inventor, if a portion having a large porosity exists in the friction material, this portion is directly connected to the rotor. It was made clear that the generation of noise during braking can be suppressed even without contact with.
即ち、本発明のディスクブレーキ用パッドは、第１〜２
図に示す様に、裏金１の表面に添着する摩擦材２を、こ
の裏金１の表面に直接接触する下層３と、この下層３の
表面に積層される表面層４との２層構造としている。That is, the disc brake pad of the present invention is
As shown in the figure, the friction material 2 attached to the surface of the backing metal 1 has a two-layer structure including a lower layer 3 that directly contacts the surface of the backing metal 1 and a surface layer 4 laminated on the surface of the lower layer 3. .
上述の様に摩擦材２を２層構造とする事は、前述した特
開昭56−167929号公報に開示された従来のディスクブレ
ーキ用パッドと同様であるが、本考案のパッドに於いて
は、上記公報に記載の発明とは逆に、下層３の気孔率を
大きく、表面層４の気孔率を小さくしている。The fact that the friction material 2 has a two-layer structure as described above is the same as the conventional disc brake pad disclosed in the above-mentioned JP-A-56-167929, but in the pad of the present invention, Contrary to the invention described in the above publication, the porosity of the lower layer 3 is large and the porosity of the surface layer 4 is small.
即ち、裏金１に直接接触する下層３の気孔率を12〜20％
と比較的大きくし、表面層４の気孔率を３〜６％程度
と、通常のパッドに於ける摩擦材の気孔率とほぼ同じと
して、下層３の気孔率を表面層４の気孔率よりも大きく
している。That is, the porosity of the lower layer 3 that directly contacts the backing metal 1 is 12 to 20%.
The porosity of the surface layer 4 is about 3 to 6%, which is almost the same as the porosity of the friction material in a normal pad, and the porosity of the lower layer 3 is higher than that of the surface layer 4. Making it big.
この様に各層の気孔率を調整するのは、摩擦材を焼成す
る場合に、各層を構成する粒状体中に加えるゴム粉末、
カシュゴムポリマ等のダストの量又はバインダの量を調
節する事で容易に行なえる。In this way, the porosity of each layer is adjusted by the rubber powder added to the granular material forming each layer when the friction material is fired.
This can be easily done by adjusting the amount of dust such as cashew rubber polymer or the amount of binder.
尚、気孔率を大きくする下層３の厚さは、摩擦材２全体
の厚さ（通常の乗用車用ディスクブレーキの場合で10mm
程度）の20〜30％程度とする。The thickness of the lower layer 3 for increasing the porosity is the total thickness of the friction material 2 (10 mm in the case of a normal passenger car disc brake).
20% to 30% of that).
（作用） 本発明のディスクブレーキ用パッドは、以上に述べた通
り構成されるが、この様なパッドを従来のパッドと同様
にディスクブレーキに組み込んで制動を行なうと、騒音
防止を考慮していないパッドに比べて騒音の発生率が減
少する。(Operation) The disc brake pad of the present invention is configured as described above. However, when such a pad is incorporated into a disc brake like the conventional pad to perform braking, noise prevention is not considered. The noise generation rate is reduced compared to the pad.
即ち、本発明者の実験によると、表面層４の気孔率を従
来の騒音防止を考慮していないパッドの摩擦材の気孔率
と同じとし、下層３の気孔率を第３図の横軸に示す様に
５〜20％の範囲で変化させた場合、騒音の発生率は同図
に縦軸で示す様に、気孔率の増大に伴って騒音の発生率
が低くなる様に変化した。That is, according to the experiment by the present inventor, the porosity of the surface layer 4 is set to be the same as the porosity of the friction material of the pad which does not consider the conventional noise prevention, and the porosity of the lower layer 3 is plotted on the horizontal axis of FIG. As shown in the figure, in the case of changing in the range of 5 to 20%, the noise generation rate changed so that the noise generation rate became lower as the porosity increased as shown by the vertical axis in the figure.
又、本発明のディスクブレーキ用パッドの場合、制動時
にロータと直接当接する表面層４の気孔率を小さい為、
制動に伴なってこの表面層４が摩耗する程度も少なくて
済む。Further, in the case of the disc brake pad of the present invention, the porosity of the surface layer 4 that directly contacts the rotor during braking is small,
The degree to which the surface layer 4 is worn due to braking is small.
（応用例） 本発明のディスクブレーキ用パッドは、上述の様に、摩
擦材２の摩耗量を少なく抑えたまま、制動時に於ける騒
音の発生を抑えるが、裏金１に直接接触する（裏金１に
貼着される）下層３の気孔率が大きく、この下層３が、
摩擦材２の外周面に露出した側面を通じて吸水し易い。
下層３が吸水した場合、下層３と裏金１との接着性が悪
化し、著しい場合には摩擦材２が裏金１から剥離してし
まう恐れがある為、第２図に鎖線で示す様に、下層３の
側面で摩擦材２の外周面に露出した部分に非通水性の油
性塗料等から成る塗膜５を形成し、下層３内への水の進
入を防止する事が好ましい。(Application Example) As described above, the disc brake pad of the present invention suppresses the generation of noise during braking while keeping the wear amount of the friction material 2 small, but directly contacts the back metal 1 (back metal 1 The lower layer 3 has a large porosity, and the lower layer 3 is
Water is easily absorbed through the side surface exposed on the outer peripheral surface of the friction material 2.
When the lower layer 3 absorbs water, the adhesion between the lower layer 3 and the backing metal 1 is deteriorated, and in a remarkable case, the friction material 2 may peel off from the backing metal 1. Therefore, as shown by the chain line in FIG. It is preferable to prevent water from entering the lower layer 3 by forming a coating film 5 made of a non-water-permeable oil-based paint on a portion of the side surface of the lower layer 3 exposed on the outer peripheral surface of the friction material 2.
c. 発明の効果 本発明のディスクブレーキ用パッドは、以上に述べた通
り構成され作用するが、摩擦材の摩耗量を少なく抑えた
まま、制動時に於ける騒音の発生を少なく抑える事が出
来、産業上の効果が大きい。c. Effect of the Invention The disc brake pad of the present invention is configured and operates as described above, but it is possible to suppress the generation of noise during braking while suppressing the wear amount of the friction material. Great industrial effect.
第１図は本発明のディスクブレーキ用パッドを示す斜視
図、第２図は第１図のＡ−Ａ断面図、第３図は下層の気
孔率と騒音発生率との関係を示す線図、第４図は従来の
ディスクブレーキ用パッドを示す斜視図、第５図は表面
層の気孔率と騒音発生率及び摩擦材の摩耗量との関係を
示す線図である。 1:裏金、2:摩擦材、3:下層、4:表面層、5:塗膜。FIG. 1 is a perspective view showing a disc brake pad of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a diagram showing the relationship between the lower layer porosity and the noise generation rate. FIG. 4 is a perspective view showing a conventional disc brake pad, and FIG. 5 is a diagram showing the relationship between the porosity of the surface layer, the noise generation rate, and the wear amount of the friction material. 1: back metal, 2: friction material, 3: lower layer, 4: surface layer, 5: coating film.
Claims (1)
車輪と共に回転するロータの側面に押圧されるパッドで
あって、裏金の表面に添着する摩擦材を、この裏金の表
面に直接接触する下層と、この下層の表面に積層される
表面層との２層構造とし、上記下層の気孔率を12〜20％
とし、下層の気孔率を表面層の気孔率よりも大きくし
た、ディスクブレーキ用パッド。1. A pad, which is incorporated in a disc brake and is pressed against a side surface of a rotor that rotates together with a wheel during braking, wherein a friction material attached to the surface of the back metal is in direct contact with the lower layer, The lower layer has a two-layer structure including a surface layer laminated on the surface, and the lower layer has a porosity of 12 to 20%.
A disc brake pad in which the porosity of the lower layer is larger than that of the surface layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20519587A JPH07113387B2 (en) | 1987-08-20 | 1987-08-20 | Disc brake pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20519587A JPH07113387B2 (en) | 1987-08-20 | 1987-08-20 | Disc brake pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6449725A JPS6449725A (en) | 1989-02-27 |
| JPH07113387B2 true JPH07113387B2 (en) | 1995-12-06 |
Family
ID=16502978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20519587A Expired - Lifetime JPH07113387B2 (en) | 1987-08-20 | 1987-08-20 | Disc brake pad |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07113387B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4646379B2 (en) | 1999-12-02 | 2011-03-09 | 株式会社カネカ | Peptidoglycan adsorbent, adsorption removal method and adsorption removal apparatus |
| JP2023020346A (en) * | 2021-07-30 | 2023-02-09 | 曙ブレーキ工業株式会社 | Underlayer material and friction member |
-
1987
- 1987-08-20 JP JP20519587A patent/JPH07113387B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6449725A (en) | 1989-02-27 |
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