JP2007232136A - Shim for disk brake and its manufacturing method it - Google Patents
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発明は、自動車等に使用されているディスクブレーキにおいて、ブレーキパッドをディスクロータに押圧する押圧部材とブレーキパッドの裏金との間に介在されるディスクブレーキ用シム、並びにその製造方法に関する。 The present invention relates to a disc brake shim interposed between a pressing member that presses a brake pad against a disc rotor and a back metal of the brake pad in a disc brake used in an automobile or the like, and a manufacturing method thereof.
自動車等において広く使用されているディスクブレーキは、車輪と一体に回転するディスクロータの両側に配設されたブレーキパッドを押圧部材により押すことにより、ディスクロータをブレーキパッドにより両側から押圧する構造となっている。ところが、ブレーキパッドがディスクロータに押圧されたとき、ブレーキパッドの裏金と押圧部材とが相対移動したり、ブレーキパッドとディスクロータとの間に生じる摩擦振動等によりブレーキ各部が加振され、一般に「鳴き」と称せられている異音が発生することがある。 A disc brake widely used in automobiles and the like has a structure in which a disc rotor is pressed from both sides by a brake pad by pressing brake pads disposed on both sides of a disc rotor that rotates integrally with a wheel with a pressing member. ing. However, when the brake pad is pressed against the disk rotor, the brake pad back metal and the pressing member move relative to each other, or each part of the brake is vibrated due to frictional vibration generated between the brake pad and the disk rotor. An unusual noise called “squeal” may occur.
そのため、このような「鳴き」の発生を防止するために、押圧部材とブレーキパッドの裏金との間にシムを介在させることが行われている。シムとしては、冷間圧延板のような薄い鉄板等からなる金属薄板の両面に薄いゴム層を固着したラバーコートメタル（ＲＣＭ）が広く使用されている（例えば、特許文献１参照）。このシムは、ゴム層が持つ弾性を利用し、鳴きの原因であるブレーキ制動時の振動を減衰させている。また、ＲＣＭのゴム面にグリースを塗布したシムも知られており、グリースにより摩擦係数を低減させることでブレーキ制動時の振動をより減衰させている（例えば、特許文献２参照）。また、ＲＣＭにグリースを塗布したシムでは、グリースが経時的に消失するため、その効果には時間的な限度があることから、それを解決するために、金属薄板に低摩擦シートを粘着したシムも提案されている（例えば、特許文献３参照）。 Therefore, in order to prevent the occurrence of such “squeal”, a shim is interposed between the pressing member and the back metal of the brake pad. As the shim, rubber coated metal (RCM) in which a thin rubber layer is fixed on both surfaces of a thin metal plate made of a thin iron plate such as a cold rolled plate is widely used (see, for example, Patent Document 1). This shim uses the elasticity of the rubber layer to dampen vibration during braking, which is the cause of squeal. A shim in which grease is applied to the rubber surface of the RCM is also known, and vibration during braking is further attenuated by reducing the friction coefficient with the grease (see, for example, Patent Document 2). In addition, in the shim in which grease is applied to the RCM, since the grease disappears with time, the effect has a time limit. To solve this, a shim in which a low friction sheet is adhered to a thin metal plate Has also been proposed (see, for example, Patent Document 3).
しかしながら、低摩擦シートを接着したシムは、ブレーキ制動時の熱を繰り返し受けるため接着剤の経時劣化が避けられず、剥離の問題がある。また、作製においても、低摩擦シートを貼り付けるために、接着剤の塗布作業や、貼り付けた後にシート表面を平滑化する作業等が必要であり、工程数も多い。 However, since the shim with the low friction sheet adhered repeatedly receives heat at the time of braking, the deterioration of the adhesive over time is unavoidable, and there is a problem of peeling. Also in production, in order to attach the low friction sheet, an adhesive application operation, an operation of smoothing the surface of the sheet after application, and the like are necessary, and the number of processes is large.
そこで本発明は、低摩擦を長期にわたり維持でき、しかも安価に製造可能なディスクブレーキ用シムを提供することを目的とする。 Accordingly, an object of the present invention is to provide a disc brake shim that can maintain low friction over a long period of time and can be manufactured at low cost.
上記目的を達成するために、本発明は、下記のディスクブレーキ用シム及びその製造方法を提供する。
（１）ディスクブレーキにおいてブレーキパッドをディスクロータに押圧する押圧部材と前記ブレーキパッドの裏金との間に介在されるディスクブレーキ用シムであって、
金属薄板の片面または両面に、摩擦係数０．２以下の低摩擦材料からなる焼結被膜が形成されていることを特徴とするディスクブレーキ用シム。
（２）ディスクブレーキにおいてブレーキパッドをディスクロータに押圧する押圧部材と前記ブレーキパッドの裏金との間に介在されるディスクブレーキ用シムであって、
金属薄板の一方の面に摩擦係数０．２以下の低摩擦材料からなる焼結被膜が形成され、他方の面に粘弾性材料からなるコーティング被膜が形成されていることを特徴とするディスクブレーキ用シム。
（３）粘弾性材料がゴムと粘着剤との混合物であることを特徴とする上記（２）記載のディスクブレーキ用シム。
（４）低摩擦材がフッ素樹脂とポリアミドイミドとの複合樹脂であることを特徴とする上記（１）〜（３）の何れか１項に記載のディスクブレーキ用シム。
（５）フッ素樹脂がポリテトラフルオロエチレンであることを特徴とする上記（４）記載のディスクブレーキ用シム。
（６）金属薄板がメッキ鋼板、鉄板またはステンレス鋼板であることを特徴とする上記（１）〜（５）の何れか１項に記載のディスクブレーキ用シム。
（７）ディスクブレーキにおいてブレーキパッドをディスクロータに押圧する押圧部材と前記ブレーキパッドの裏金との間に介在されるディスクブレーキ用シムの製造方法であって、
コイル状の金属薄板を他端から巻き取りながら、その途上で、金属薄板の片面または両面に摩擦係数０．２以下の低摩擦材料を含む塗液を塗工し、塗膜を焼結させた後、シム用の所定形状に打ち抜くことを特徴とするディスクブレーキ用シムの製造方法。
（８）ディスクブレーキにおいてブレーキパッドをディスクロータに押圧する押圧部材と前記ブレーキパッドの裏金との間に介在されるディスクブレーキ用シムの製造方法であって、
金属薄板の一方の面に摩擦係数０．２以下の低摩擦材料を含む塗液を塗工し、塗膜を焼成した後、他方の面に弾性材料を含む塗液を塗工し、その後、低摩擦材のシム用の所定形状に打ち抜くことを特徴とするディスクブレーキ用シムの製造方法。
In order to achieve the above object, the present invention provides the following disc brake shim and manufacturing method thereof.
(1) A disc brake shim interposed between a pressing member that presses a brake pad against a disc rotor in a disc brake and a back metal of the brake pad,
A disc brake shim, wherein a sintered coating made of a low friction material having a friction coefficient of 0.2 or less is formed on one or both surfaces of a thin metal plate.
(2) A disc brake shim interposed between a pressing member that presses the brake pad against the disc rotor and a back metal of the brake pad in the disc brake,
A disc brake characterized in that a sintered coating made of a low friction material having a friction coefficient of 0.2 or less is formed on one surface of a thin metal plate, and a coating coating made of a viscoelastic material is formed on the other surface Sim.
(3) The disc brake shim according to (2) above, wherein the viscoelastic material is a mixture of rubber and an adhesive.
(4) The disc brake shim according to any one of (1) to (3) above, wherein the low friction material is a composite resin of a fluororesin and a polyamideimide.
(5) The disc brake shim according to (4) above, wherein the fluororesin is polytetrafluoroethylene.
(6) The disc brake shim according to any one of (1) to (5) above, wherein the metal thin plate is a plated steel plate, an iron plate, or a stainless steel plate.
(7) A method of manufacturing a disc brake shim interposed between a pressing member that presses a brake pad against a disc rotor and a back metal of the brake pad in the disc brake,
While winding the coiled metal thin plate from the other end, a coating liquid containing a low friction material having a friction coefficient of 0.2 or less was applied to one or both surfaces of the metal thin plate, and the coating film was sintered. Thereafter, the shim for a disc brake is manufactured by stamping into a predetermined shape for the shim.
(8) A method of manufacturing a disc brake shim interposed between a pressing member that presses a brake pad against a disc rotor and a back metal of the brake pad in the disc brake,
After coating a coating liquid containing a low friction material having a friction coefficient of 0.2 or less on one surface of the metal thin plate, baking the coating film, coating a coating liquid containing an elastic material on the other surface, A method of manufacturing a disc brake shim, comprising: punching a low friction material shim into a predetermined shape.
本発明のディスクブレーキ用シムは、表面に低摩擦材からなる焼結被膜を形成したものであり、低摩擦シートを貼り付けたディスクグレーキ用シムにおける粘着剤の劣化の問題が無く、より長期にわたり低摩擦状態を維持できる。 The disc brake shim of the present invention is formed by forming a sintered coating made of a low friction material on the surface, there is no problem of deterioration of the adhesive in the disc graffiti shim with a low friction sheet, and a longer period of time. Can maintain a low friction state.
また、製造方法も、コイル状の金属薄板の他端を巻き取りながら、その途上で、低摩擦材料を含む溶液をコーティングし、焼成した後、シムの形状に打ち抜くため、一つの連続した工程とすることが可能で、生産性にも優れ、コスト面でも有利となる。 In addition, the manufacturing method also includes one continuous process for winding the other end of the coiled metal thin plate, coating a solution containing a low friction material on the way, firing, and then punching into a shim shape. It is possible to do this, is excellent in productivity, and is advantageous in terms of cost.
以下、本発明に関して図面を参照して詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to the drawings.
本発明のディスクブレーキ用シムは、図１に示すように、金属薄板の両面に低摩擦材料からなる焼結被膜を設けたものである。また、図示は省略するが、金属薄板の片面にのみ低摩擦材料からなる焼結被膜を形成してもよい。あるいは、図２に示すように、金属薄板の一方の面に低摩擦材料からなる焼結被膜を形成し、他方の面に粘弾性材料からなるコーティング被膜を形成してもよい。 As shown in FIG. 1, the disc brake shim of the present invention is provided with a sintered coating made of a low friction material on both surfaces of a thin metal plate. Moreover, although illustration is abbreviate | omitted, you may form the sintered film which consists of a low friction material only on the single side | surface of a metal thin plate. Alternatively, as shown in FIG. 2, a sintered coating made of a low friction material may be formed on one surface of a thin metal plate, and a coating coating made of a viscoelastic material may be formed on the other surface.
金属薄板は、メッキ鋼板や鉄板、ステンレス鋼板が好ましい。金属薄板は、その端面が露出するため、錆の発生が少ないメッキ鋼板やステンレス鋼板が好ましい。特に、低摩擦材からなるコーティング被膜を片面にのみ形成する場合は、他方の面が露出するためメッキ鋼板及びステンレス鋼板を用いると効果的である。 The metal thin plate is preferably a plated steel plate, an iron plate, or a stainless steel plate. Since the end face of the metal thin plate is exposed, a plated steel plate or a stainless steel plate with less rusting is preferable. In particular, when a coating film made of a low friction material is formed only on one side, it is effective to use a plated steel plate and a stainless steel plate because the other side is exposed.
メッキ鋼板には、ニッケルメッキ鋼板のように鉄よりも腐食し難い金属をメッキしたものと、亜鉛メッキ鋼板やアルミメッキ鋼板のように鉄よりも腐食し易い金属をメッキしたものの２種類がある。前者のメッキ鋼板は、鉄と空気や水分との接触を防ぐことで耐食性を向上させている。また、後者のメッキ鋼板は、メッキ層の金属が鉄の代わりに犠牲的に腐食されて鉄の腐食を防いでいる（犠牲腐食防食効果）。従って、鋼板端面のメッキされていない部分が直接空気や水分と接触し難い用途に使用される製品や部材には、前者のメッキ鋼板が有効である。しかしながら、シムのように端面が露出している場合、前者のメッキ鋼板では端面から腐食が進行する。ところが、後者のメッキ鋼板では、メッキされていない端部もメッキ層の犠牲防食効果により鉄の腐食を防ぐことが可能になる。また、後者のメッキ鋼板には、亜鉛メッキ鋼板やアルミメッキ鋼板があるが、アルミメッキ鋼板では数年以上の長期にわたって使用される部品には適さない。そこで、本発明ではメッキ鋼板１として、亜鉛を主に使用したメッキ鋼板を使用することが好ましい。このようなメッキ鋼板としては、電気亜鉛メッキ鋼板、電気亜鉛合金メッキ鋼板、溶融亜鉛メッキ鋼板、溶融亜鉛合金メッキ鋼板、鉛−錫合金メッキ鋼板等を好適に使用できる。中でも、耐食性を維持する上で、電気亜鉛合金メッキ鋼板及び溶融亜鉛合金メッキ鋼板が好ましい。これら亜鉛合金メッキ中の亜鉛以外の含有成分としては、コバルト、モリブデン、アルミニウム等が好ましい。これらメッキ鋼板は、ステンレス鋼板に比べて安価であるという利点を有する。また、これらメッキ鋼板は、耐食性を更に向上させる目的で、クロム処理やリン酸処理等の表面処理が施されていてもよい。 There are two types of plated steel sheets: those plated with metals that are less likely to corrode than iron, such as nickel-plated steel sheets, and those plated with metals that are more likely to corrode than iron, such as galvanized steel sheets and aluminum-plated steel sheets. The former plated steel sheet has improved corrosion resistance by preventing contact between iron and air or moisture. In the latter plated steel plate, the metal of the plating layer is sacrificially corroded instead of iron to prevent corrosion of iron (sacrificial corrosion protection effect). Therefore, the former plated steel plate is effective for products and members used for applications in which the unplated portion of the steel plate end face is difficult to come into direct contact with air or moisture. However, when the end face is exposed like a shim, corrosion proceeds from the end face in the former plated steel sheet. However, in the latter plated steel plate, it is possible to prevent the corrosion of iron even at the unplated end portion by the sacrificial anticorrosive effect of the plated layer. Moreover, although the latter plated steel plate includes a galvanized steel plate and an aluminized steel plate, the aluminized steel plate is not suitable for parts used for a long period of several years or more. Therefore, in the present invention, it is preferable to use a plated steel plate mainly using zinc as the plated steel plate 1. As such a plated steel plate, an electrogalvanized steel plate, an electrogalvanized steel plate, a hot dip galvanized steel plate, a hot dip zinc alloy plated steel plate, a lead-tin alloy plated steel plate, or the like can be suitably used. Among these, in order to maintain the corrosion resistance, an electrogalvanized steel sheet and a hot dip galvanized steel sheet are preferable. As components other than zinc in these zinc alloy plating, cobalt, molybdenum, aluminum and the like are preferable. These plated steel sheets have the advantage of being cheaper than stainless steel sheets. These plated steel sheets may be subjected to surface treatment such as chromium treatment or phosphoric acid treatment for the purpose of further improving the corrosion resistance.
低摩擦材料としては、摩擦係数が０．２以下、好ましくは０．１以下で、塗布によるコーティングが可能なものを用いる。また、ブレーキ制動時の発熱に耐え得る耐熱性と、耐摩耗性に優れることも要求される。これらを考慮すると、ポリアセタール、超高分子ポリエチレン、またはフッ素樹脂とポリアミドイミドとの複合材を好適に挙げることができる。ポリアセタールは摩擦係数が０．１４、超高分子ポリエチレンは摩擦係数が０．１５であるが、特にフッ素樹脂とポリアミドイミドとの複合材は摩擦係数が０．１以下にすることができるため好ましい。フッ素樹脂としては、ポリテトラフルオロエチレン、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体、テトラフルオロエチレン・ヘキサフルオロプロピレン共重合体、テトラフルオロエチレン・エチレン共重合体、ポリビニリデンフルオライド、ポリクロロトリフルオロエチレン等を単独で、あるいは混合して使用できる。また、この複合材において、フッ素樹脂の量を複合材全量の１０質量％以上にすると摩擦係数を０．２以下にすることができ、フッ素樹脂の量を複合材全量の２０質量％以上２５質量％以下にすると摩擦係数を０．１以下にすることができる。但し、フッ素樹脂の量が複合材全量の３０質量％を超えると、複合材の耐久性に問題が出てくるおそれがあり、好ましくない。 As the low friction material, a material having a friction coefficient of 0.2 or less, preferably 0.1 or less and capable of being coated by application is used. In addition, it is required to have heat resistance that can withstand heat generation during braking and excellent wear resistance. Considering these, preferred are polyacetal, ultra-high molecular weight polyethylene, or a composite material of fluororesin and polyamideimide. Polyacetal has a coefficient of friction of 0.14, and ultrahigh molecular weight polyethylene has a coefficient of friction of 0.15. In particular, a composite material of a fluororesin and polyamide-imide is preferable because the coefficient of friction can be 0.1 or less. Examples of fluororesins include polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, polyvinylidene fluoride, polychlorotrimethyl. Fluoroethylene or the like can be used alone or in combination. In this composite material, when the amount of the fluororesin is 10% by mass or more of the total amount of the composite material, the friction coefficient can be 0.2 or less, and the amount of the fluororesin is 20% by mass or more and 25% by mass of the total amount of the composite material. % Or less can reduce the friction coefficient to 0.1 or less. However, if the amount of the fluororesin exceeds 30% by mass of the total amount of the composite material, there may be a problem in durability of the composite material, which is not preferable.
上記の低摩擦材料からなるコーティング被膜の膜厚は、特に制限されるものではないが、耐久性を考慮すると５〜３０μｍが好ましい。 The thickness of the coating film made of the low friction material is not particularly limited, but is preferably 5 to 30 μm in consideration of durability.
粘弾性材料は、制振作用に優れるものが好ましく、ゴムと粘着剤との混合物を用いることが好ましい。ゴムは、従来からディスクブレーキ用シムに使用されているものでかまわず、アクリロニトリルブタジエンゴム（ＮＢＲ）、水素化アクリロニトリルブタジエンゴム（Ｈ−ＮＢＲ）、スチレンーブタジエンゴム（ＳＢＲ）、エチレンープロピレンゴム（ＥＰＤＭ）等に加硫を施して得られたゴム、あるいはフッ素ゴム、シリコーンゴム等を好適に使用できる。中でも、汎用性、耐油性、耐熱性等を考えるとＮＢＲが最も適している。また、加硫には、加硫促進剤を併用すると加硫状態が安定する。加硫促進剤としては、ジチオカルバミン酸塩系またはジチオカルバメート系の加硫促進剤が好ましい。また、粘着剤としては、アクリル系、ウレタン系、シリコーン系の各粘着剤を使用することができ、中でもコストパフォーマンスや接着性に優れるアクリル系粘着剤が好ましい。 The viscoelastic material is preferably excellent in vibration damping action, and it is preferable to use a mixture of rubber and adhesive. The rubber may be one conventionally used for a disc brake shim, such as acrylonitrile butadiene rubber (NBR), hydrogenated acrylonitrile butadiene rubber (H-NBR), styrene-butadiene rubber (SBR), ethylene-propylene rubber ( A rubber obtained by vulcanizing EPDM) or the like, or a fluorine rubber, a silicone rubber or the like can be preferably used. Among these, NBR is most suitable when considering versatility, oil resistance, heat resistance, and the like. In addition, when a vulcanization accelerator is used together for vulcanization, the vulcanized state is stabilized. The vulcanization accelerator is preferably a dithiocarbamate or dithiocarbamate vulcanization accelerator. As the pressure-sensitive adhesive, acrylic-based, urethane-based, and silicone-based pressure-sensitive adhesives can be used, and among them, an acrylic pressure-sensitive adhesive excellent in cost performance and adhesiveness is preferable.
上記の粘弾性材料からなるコーティング被膜の膜厚は、特に制限されるものではないが、制振性と耐久性とを考慮すると５０〜２００μｍが好ましい。 The thickness of the coating film made of the viscoelastic material is not particularly limited, but is preferably 50 to 200 μm in view of vibration damping properties and durability.
上記のディスクブレーキ用シムは、コイル状に巻き取られた金属薄板を巻取ボビンで巻き取りながら、その途上で、先ず金属薄板の両面または片面に低摩擦材料を含む塗液を塗布し、引き続き加熱炉にて低摩擦材料の塗膜を焼結させ、その後、打抜プレスにてシムの形状に打ち抜くことで、一つの製造ラインで連続して製造することができる。 The above-mentioned disc brake shim, while winding a thin metal plate wound in a coil shape with a winding bobbin, firstly, a coating liquid containing a low friction material is applied to both sides or one side of the thin metal plate, and subsequently Sintering the coating film of the low friction material in a heating furnace, and then punching it into the shape of a shim with a punching press enables continuous production on one production line.
低摩擦材料を含む塗液は、低摩擦材料からなる微粒子を揮発性の溶媒に分散させた分散液が適当である。塗液における低摩擦材料の濃度は、余り低濃度では上記のコーティング被膜の膜厚となり難く、高濃度すぎても塗工し難くなるため１０〜２０％の範囲が好ましい。尚、溶媒としては、低摩擦材料に対して化学的に安定なものを使用し、例えばポリテトラフルオロエチレンとポリアミドイミドを用いる場合は、Ｎ−メチル−２−ピロリドン等が好適である。また、用いる塗布装置としては、広い面積に均一に塗工できることから、ロールコータやスプレー等が好適である。また、塗膜の膜厚は、焼結後に上記の膜厚となるように調整される。 The coating liquid containing the low friction material is suitably a dispersion liquid in which fine particles made of the low friction material are dispersed in a volatile solvent. The concentration of the low-friction material in the coating liquid is preferably in the range of 10 to 20% because the coating film thickness is difficult to achieve when the concentration is too low, and coating is difficult even when the concentration is too high. In addition, as a solvent, what is chemically stable with respect to a low friction material is used, for example, when using polytetrafluoroethylene and polyamideimide, N-methyl-2-pyrrolidone etc. are suitable. Moreover, as a coating apparatus to be used, a roll coater, a spray, etc. are suitable since it can apply uniformly over a wide area. Moreover, the film thickness of a coating film is adjusted so that it may become said film thickness after sintering.
焼結温度は、低摩擦材料の種類に応じて決定され、例えば、塗液にポリテトラフルオロエチレンとポリアミドイミドとの混合分散液を用いる場合は４００〜４５０℃で加熱すればよい。焼結により、低摩擦材料からなる緻密な被膜が、金属薄板上に強固に密着して形成される。 The sintering temperature is determined according to the type of the low friction material. For example, when a mixed dispersion of polytetrafluoroethylene and polyamideimide is used for the coating liquid, the sintering temperature may be heated at 400 to 450 ° C. By sintering, a dense coating made of a low friction material is formed in close contact with the thin metal plate.
また、図２に示すような、一方の面に低摩擦材料からなるコーティング被膜を形成し、他方の面に粘弾性材料からなるコーティング被膜を形成したディスクブレーキ用シムを製造する場合は、上記と同様にして金属薄板の片面に低摩擦材料を含む塗液を塗工し、焼結した後、打抜プレスによる打ち抜きを行うことなく、低摩擦材料からなるコーティング被膜が形成された金属薄板を巻取ボビンに巻き取る。次いで、低摩擦材料からなる焼結被膜が形成された金属薄板に対して、巻取ボビンで巻取りながら、他方の面に粘弾性材料を含む塗液を塗布し、塗膜を乾燥させた後、打抜プレスにて所定形状に打ち抜けばよい。 Further, when manufacturing a disc brake shim having a coating film made of a low friction material on one surface and a coating film made of a viscoelastic material on the other surface as shown in FIG. In the same manner, after coating a coating liquid containing a low friction material on one side of the metal thin plate and sintering it, the metal thin plate with a coating film made of the low friction material is wound without punching with a punching press. Take up the take-up bobbin. Next, after winding the thin metal plate on which a sintered coating made of a low friction material is formed with a winding bobbin, a coating liquid containing a viscoelastic material is applied to the other surface and the coating is dried. Then, it can be punched into a predetermined shape by a punching press.
尚、製造ラインが長くなるが、金属薄板を巻取ボビンに巻き取りながら、一方の面に低摩擦材料を含む塗液を塗工し焼結した後、引き続き、他方の面に粘弾性材料を含む塗液を塗工し乾燥させた後、打抜プレスにより所定形状に打ち抜くこともでき、この場合は、一つの製造ラインで連続して製造することができる。 Although the production line becomes long, after winding a thin metal plate on a winding bobbin, a coating liquid containing a low friction material is applied and sintered on one surface, and then a viscoelastic material is applied on the other surface. After the coating liquid containing the coating liquid is applied and dried, it can be punched into a predetermined shape by a punching press. In this case, it can be continuously manufactured on one manufacturing line.
（実施例１〜４）
ポリアミドイミド微粒子とポリテトラフルオロエチレン微粒子とを、その混合比率を表１のように変えて混合した樹脂混合物を、Ｎ−メチル−２−ピロリドンに濃度１８％となるように添加し、分散させて塗液を調製した。そして、ステンレスコイルの片面にロールコータにて前記塗液を塗布し、加熱炉にて４００℃で塗膜を焼結し、焼結被膜とした後、打抜プレスにてシム形状に打ち抜き、試験シムＡ〜Ｄを作製した。尚、焼結後の被膜の膜厚は１０μｍであった。
(Examples 1-4)
A resin mixture obtained by mixing polyamideimide fine particles and polytetrafluoroethylene fine particles while changing the mixing ratio as shown in Table 1 was added to N-methyl-2-pyrrolidone so as to have a concentration of 18%, and dispersed. A coating solution was prepared. Then, the coating liquid is applied to one side of a stainless steel coil with a roll coater, the coating film is sintered at 400 ° C. in a heating furnace to form a sintered coating, and then punched into a shim shape with a punching press. Sims A to D were made. The film thickness after sintering was 10 μm.
（実施例５）
低摩擦材料にポリアセタールを使用した以外は実施例１〜４と同様にして焼結被膜を形成し、試験シムＥを得た。
(Example 5)
A test film E was obtained by forming a sintered coating in the same manner as in Examples 1 to 4 except that polyacetal was used as the low friction material.
（実施例６）
低摩擦材料に超高分子ポリエチレンを使用した以外は実施例１〜４と同様にして焼結被膜を形成し、試験シムＦを得た。
(Example 6)
A test film F was obtained by forming a sintered coating in the same manner as in Examples 1 to 4 except that ultrahigh molecular weight polyethylene was used as the low friction material.
（比較例１）
低摩擦材料として、ポリアミドイミド微粒子とポリテトラフルオロエチレン微粒子との重量比を、ポリアミドイミド微粒子：ポリテトラフルオロエチレン微粒子＝９５：５で混合した樹脂混合物を用いた以外は実施例１〜４と同様にして焼結被膜を形成し、試験シムＧを得た。
(Comparative Example 1)
As a low-friction material, the same as in Examples 1 to 4 except that a resin mixture in which the weight ratio of polyamideimide fine particles and polytetrafluoroethylene fine particles was mixed with polyamideimide fine particles: polytetrafluoroethylene fine particles = 95: 5 was used. A sintered coating was formed to obtain a test shim G.
（比較例２）
低摩擦材料として、ポリアミドイミド微粒子とポリテトラフルオロエチレン微粒子との重量比を、ポリアミドイミド微粒子：ポリテトラフルオロエチレン微粒子＝４０：６０で混合した樹脂混合物を用いた以外は実施例１〜４と同様にして焼結被膜を形成し、試験シムＨを得た。
(Comparative Example 2)
As a low friction material, the same as in Examples 1 to 4 except that a resin mixture in which the weight ratio of polyamideimide fine particles and polytetrafluoroethylene fine particles was mixed at a polyamideimide fine particle: polytetrafluoroethylene fine particle = 40: 60 was used. Thus, a sintered coating was formed to obtain a test shim H.
（比較例３）
シムの形状に打ち抜いたステンレス鋼板の片面に、アクリル系粘着剤により厚さ５０μｍのフッ素樹脂製シートを貼り付け、試験シムＩを作製した。
(Comparative Example 3)
A test shim I was prepared by attaching a fluororesin sheet having a thickness of 50 μm to one side of a stainless steel plate punched into a shim shape with an acrylic adhesive.
（耐久性試験）
試験シムＡ〜Ｉを、それぞれディスクブレーキの裏金とブレーキバッドとの間に配設し、ブレーキ鳴きダイナモ試験機に装着した。そして、雰囲気温度１０℃とし、タイヤを５０ｋｍ／ｈｒで回転させ、ブレーキ油圧０．２〜２ＭＰａにてブレーキを断続的にかけ、鳴きが発生するまでのプレーキ回数を計数した。
(Durability test)
Each of the test shims A to I was disposed between a disc brake back metal and a brake pad and mounted on a brake squealing dynamo testing machine. Then, the atmospheric temperature was set to 10 ° C., the tire was rotated at 50 km / hr, the brake was intermittently applied at a brake hydraulic pressure of 0.2 to 2 MPa, and the number of times of play until squeal was generated was counted.
結果を表１に示すが、本発明に従う実施例の試験シムＡ〜Ｆは何れも優れた耐久性を示している。また、ポリアミドイミド微粒子とポリテトラフルオロエチレン微粒子との複合材でも、ポリテトラフルオロエチレンが複合材全量の１０〜３０質量％の範囲外では目的とする耐久性が得られないことがわかる。尚、試験シムＩでは１８５回で鳴きが発生したが、これは、高温のためフッ素樹脂製シートの一部が剥離したためである。 The results are shown in Table 1, and the test shims A to F of the examples according to the present invention all show excellent durability. It can also be seen that even with a composite material of polyamideimide fine particles and polytetrafluoroethylene fine particles, the desired durability cannot be obtained when the polytetrafluoroethylene is outside the range of 10 to 30% by mass of the total amount of the composite material. In Test Shim I, squeak occurred 185 times because part of the fluororesin sheet peeled off due to the high temperature.
Claims (8)
金属薄板の片面または両面に、摩擦係数０．２以下の低摩擦材料からなる焼結被膜が形成されていることを特徴とするディスクブレーキ用シム。 A disc brake shim interposed between a pressing member that presses a brake pad against a disc rotor in a disc brake and a back metal of the brake pad,
A disc brake shim, wherein a sintered coating made of a low friction material having a friction coefficient of 0.2 or less is formed on one or both surfaces of a thin metal plate.
金属薄板の一方の面に摩擦係数０．２以下の低摩擦材料からなる焼結被膜が形成され、他方の面に粘弾性材料からなるコーティング被膜が形成されていることを特徴とするディスクブレーキ用シム。 A disc brake shim interposed between a pressing member that presses a brake pad against a disc rotor in a disc brake and a back metal of the brake pad,
A disc brake characterized in that a sintered coating made of a low friction material having a friction coefficient of 0.2 or less is formed on one surface of a thin metal plate, and a coating coating made of a viscoelastic material is formed on the other surface Sim.
コイル状の金属薄板を他端から巻き取りながら、その途上で、金属薄板の片面または両面に摩擦係数０．２以下の低摩擦材料を含む塗液を塗工し、塗膜を焼結させた後、シム用の所定形状に打ち抜くことを特徴とするディスクブレーキ用シムの製造方法。 A disc brake shim that is interposed between a pressing member that presses a brake pad against a disc rotor in a disc brake and a back metal of the brake pad,
While winding the coiled metal thin plate from the other end, a coating liquid containing a low friction material having a friction coefficient of 0.2 or less was applied to one or both surfaces of the metal thin plate, and the coating film was sintered. Thereafter, the shim for a disc brake is manufactured by stamping into a predetermined shape for the shim.
コイル状の金属薄板を他端から巻き取りながら、その途上で、金属薄板の一方の面に摩擦係数０．２以下の低摩擦材料を含む塗液を塗工し、塗膜を焼結させた後、他方の面に弾性材料を含む塗液を塗工し、その後、低摩擦材のシム用の所定形状に打ち抜くことを特徴とするディスクブレーキ用シムの製造方法。 A disc brake shim that is interposed between a pressing member that presses a brake pad against a disc rotor in a disc brake and a back metal of the brake pad,
While winding the coiled metal thin plate from the other end, a coating liquid containing a low friction material having a friction coefficient of 0.2 or less was applied to one surface of the metal thin plate, and the coating film was sintered. A method for manufacturing a shim for a disc brake, characterized in that a coating liquid containing an elastic material is applied to the other surface and then punched into a predetermined shape for a shim of a low friction material.
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| JP2009270610A (en) * | 2008-05-07 | 2009-11-19 | Do Hee Kim | Pad spring for disc brake, and its manufacturing method |
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| JPH0218422A (en) * | 1988-07-06 | 1990-01-22 | Toray Ind Inc | Aromatic polyamide-imide resin and production hereof |
| JPH08267650A (en) * | 1995-03-29 | 1996-10-15 | Nichias Corp | Restraining type vibration-damper |
| JP2003033995A (en) * | 2001-05-17 | 2003-02-04 | Nisshin Steel Co Ltd | Heat resistant non-sticky coated metal plate excellent in wear resistance and coating material for heat resistant non-sticky coating |
| JP2005325842A (en) * | 2005-06-13 | 2005-11-24 | Daikin Ind Ltd | Fluid machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0218422A (en) * | 1988-07-06 | 1990-01-22 | Toray Ind Inc | Aromatic polyamide-imide resin and production hereof |
| JPH08267650A (en) * | 1995-03-29 | 1996-10-15 | Nichias Corp | Restraining type vibration-damper |
| JP2003033995A (en) * | 2001-05-17 | 2003-02-04 | Nisshin Steel Co Ltd | Heat resistant non-sticky coated metal plate excellent in wear resistance and coating material for heat resistant non-sticky coating |
| JP2005325842A (en) * | 2005-06-13 | 2005-11-24 | Daikin Ind Ltd | Fluid machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009270610A (en) * | 2008-05-07 | 2009-11-19 | Do Hee Kim | Pad spring for disc brake, and its manufacturing method |
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