JPH0321768B2 - - Google Patents
Info
- Publication number
- JPH0321768B2 JPH0321768B2 JP58175728A JP17572883A JPH0321768B2 JP H0321768 B2 JPH0321768 B2 JP H0321768B2 JP 58175728 A JP58175728 A JP 58175728A JP 17572883 A JP17572883 A JP 17572883A JP H0321768 B2 JPH0321768 B2 JP H0321768B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- alumina
- fiber
- cylinder
- nickel
- 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
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
-
- 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
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
- F16D2125/06—Pistons
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Braking Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はデイスクブレーキ用ピストンに関する
ものであり、詳しくは摺動部分を含むピストン本
体をセラミツクスないしは繊維強化プラスチツク
製とし、摩擦パツド裏金に接するピストン開口端
を含む部分をスチール製として、両者を組み合わ
せて一体化したデイスクブレーキ用ピストンに関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston for disc brakes, and more specifically, the piston body including the sliding part is made of ceramics or fiber reinforced plastic, and the part including the piston opening end that contacts the friction pad back metal is made of steel. This relates to a piston for disc brakes that is made by combining the two into an integrated product.
従来一般にデイスクブレーキ用ピストンとして
は機械的性質の優れたスチール製のものが用いら
れているが、重量が重く、又熱伝導性が大きいた
め高温の摩擦パツド裏金に接するピストン開口端
より多量の熱がピストン側に伝導され、これがた
めシール部材等を損傷したり、シリンダー内のブ
レーキ液温を上昇させてペーパーロツクを発生さ
せる等の欠点がある。 Conventionally, steel pistons with excellent mechanical properties have been used as pistons for disc brakes, but because they are heavy and have high thermal conductivity, a large amount of heat is generated from the open end of the piston, which is in contact with the high-temperature friction pad back metal. is conducted to the piston side, which has disadvantages such as damaging the sealing member, etc., and raising the temperature of the brake fluid in the cylinder, causing paper lock.
又、これに代るものとして軽量で断熱性に優れ
たセラミツクス製ピストンやプラスチツク製ピス
トンがあるが、セラミツクス製ピストンはじん性
が小でピストン開口端が欠け落ちる欠点があり、
又摩擦パツド裏金の穴部と接合するピストン開口
端の部分から応力集中によりクラツクが発生する
ことがある。又例えばアルミナ系セラミツクス製
ピストンでは熱衝撃値が約220℃で熱クラツクを
発生する。 As an alternative, there are ceramic pistons and plastic pistons that are lightweight and have excellent heat insulation properties, but ceramic pistons have the disadvantage of low toughness and the piston opening end may chip.
In addition, cracks may occur due to stress concentration at the opening end of the piston that joins the hole in the friction pad back metal. For example, a piston made of alumina ceramics will generate a thermal crack at a thermal shock value of about 220°C.
又、プラスチツク製ピストンでは高温の摩擦パ
ツド裏金と接触するピストン開口端の部分が急激
な熱膨張のため亀裂を生ずる欠点がある。 Furthermore, plastic pistons have the disadvantage that the open end portion of the piston, which comes into contact with the high-temperature friction pad back metal, cracks due to rapid thermal expansion.
本発明はこのような従来のデイスクブレーキ用
ピストンの欠点に対処してなされたもので、強度
要求の小さな摺動部分を含むピストン本体を軽量
で断熱性に優れたセラミツクスないしは繊維強化
プラスチツク製とし、摩擦パツド裏金に接するピ
ストン開口端を含む部分を断熱性ならびに機械的
性質に優れたスチール製として、両者を組み合わ
せて一体化することにより、軽量にして耐久性が
ありしかも摩擦パツド裏金からの伝熱を遮断して
ペーパーロツクの発生やシール部材等の損傷を防
ぐようにした新規なデイスクブレーキ用ピストン
に係わるものである。 The present invention has been made to address these drawbacks of conventional disc brake pistons, and the piston body, which includes the sliding parts that require small strength requirements, is made of lightweight ceramics or fiber-reinforced plastics that have excellent heat insulation properties. The part including the piston opening end that comes into contact with the friction pad back metal is made of steel with excellent heat insulation and mechanical properties, and by combining and integrating the two, it is lightweight and durable, while allowing heat to be transferred from the friction pad back metal. This invention relates to a new piston for disc brakes that prevents the occurrence of paper lock and damage to seal members, etc. by blocking the piston.
即ち、本発明は一端を開口した筒状のセラミツ
クス製もしくは繊維強化プラスチツク製ピストン
本体の内部に、外側の底面及び側面を含む外面に
金属粗粒で溶射被覆して多数の凸部を形成したス
チール製筒状体を嵌合してなり、上記ピストン本
体の内面は上記多数の凸部と点接触状態にあるこ
とを特徴とするものである。 That is, the present invention provides a piston body made of cylindrical ceramics or fiber-reinforced plastic with one end open, and a steel piston body in which a large number of convex portions are formed by thermally spraying the outer surface including the bottom and side surfaces of the piston body with coarse metal particles. It is characterized in that the inner surface of the piston body is in point contact with the plurality of convex portions.
ピストン本体を構成するセラミツクスとしては
アルミナ（Al2O3）系、ジルコニア（ZrO2）系、
窒化珪素（Si3N4）系、炭化珪素（SiC）系等で
望ましくは反応充填材を添加するか、又は添加し
ないそれらの焼結体である。又繊維強化プラスチ
ツクとしてはガラス繊維等で強化された熱硬化性
樹脂で例えば繊維強化フエノール樹脂であるが、
他の樹脂を用いることもできる。 Ceramics that make up the piston body include alumina (Al 2 O 3 ), zirconia (ZrO 2 ),
It is a sintered body of silicon nitride (Si 3 N 4 ) type, silicon carbide (SiC) type, etc., preferably with or without the addition of a reactive filler. Fiber-reinforced plastics include thermosetting resins reinforced with glass fibers, such as fiber-reinforced phenolic resins.
Other resins can also be used.
溶射被覆に用いる溶射材としてはニツケル・ア
ルミ複合体、ニツケル・クロム合金、アルミブロ
ンズ複合体、亜鉛、アルミナ等の粗粒で、このう
ちニツケル・アルミ複合体が好適である。 Coarse particles of nickel-aluminum composites, nickel-chromium alloys, aluminum-bronze composites, zinc, alumina, etc. are used as thermal spraying materials for thermal spray coating, and among these, nickel-aluminum composites are preferred.
このものは650℃迄の温度に耐え、又650〜920
℃間の高温の短期曝露にも耐えて耐酸化抵抗が高
く、結合力、抗張力に共に大で安定した溶射材で
ある。 This product can withstand temperatures up to 650℃, and
It is a thermal spray material that can withstand short-term exposure to high temperatures between ℃ and 300°C, has high oxidation resistance, and has high bonding strength and tensile strength.
スチール製鍔付筒状体の外面の金属粗粒による
溶射被覆に際しては、そのスチール素地を脱脂
後、ブラスチングにより粗面化を行なうが、より
好ましくは冷間鋳造で加工成形した該筒状体の外
面にローレツト加工を施して凹凸をつけると、溶
射の接合力が強化され、ピストン本体との嵌合に
も有利である。又この加工により嵌合部の空隙も
増加するので空気による断熱効果も得られる。 When thermally spraying the outer surface of a flanged steel cylindrical body with coarse metal particles, the steel base is degreased and then roughened by blasting, but it is more preferable to coat the cylindrical body after processing and forming it by cold casting. If the outer surface is knurled to create irregularities, the bonding force of thermal spraying will be strengthened and it will also be advantageous for fitting with the piston body. This process also increases the voids in the fitting portion, so that an air insulating effect can also be obtained.
このように前処理した該筒状体の外面に金属粗
粒の溶射被覆により200μｍ以上の凹凸の大きい
粗面を形成させ、ついでこの筒状体を前記ピスト
ン本体の内部に嵌合して一体化させるものであ
る。そしてこの際嵌合部においては、上記ピスト
ン本体の内面は、上記溶射により得られた筒状体
外面の金属粗粒からなる多数の凸部に点接触して
いるものである。 A rough surface with large irregularities of 200 μm or more is formed on the outer surface of the thus pretreated cylindrical body by thermal spray coating with coarse metal particles, and then this cylindrical body is fitted into the inside of the piston body and integrated. It is something that makes you At this time, in the fitting portion, the inner surface of the piston body is in point contact with a large number of convex portions made of coarse metal particles on the outer surface of the cylindrical body obtained by the thermal spraying.
この嵌合を余り強くすると外側のピストン本体
よりも内側の筒状体の熱膨張率が大きいので実用
時ブレーキ熱による膨張でピストン本体がクラツ
クを起したり、破壊する恐れがあるので好ましく
ない。 If this fit is made too strong, the coefficient of thermal expansion of the inner cylindrical body is greater than that of the outer piston body, which is undesirable because the piston body may crack or break due to expansion due to braking heat during practical use.
又、この嵌合部を合成樹脂接着剤による接着接
合する方法も考えられるが、ブレーキ熱により
400℃以上となるので接着剤は熱劣化を起し実用
的でない。 Another possibility is to adhesively bond this fitting part with synthetic resin adhesive, but it may be damaged due to brake heat.
Since the temperature is over 400℃, the adhesive will deteriorate due to heat and is not practical.
本発明においては上記のようにして両者を嵌合
することにより、嵌合部に150μｍ以上の空隙が
得られるので該筒状体の熱膨張により寸法変化を
充分に吸収することができ、又この空隙によりブ
レーキ作動時の圧縮によるピストン本体内の底部
にかかる局部集中荷重を緩和してクラツクの発生
を防止することができる。又金属粗粒による溶射
層はダンピング製が高いのでブレーキノイズにも
有効である。 In the present invention, by fitting the two as described above, a gap of 150 μm or more is obtained in the fitting part, so that dimensional changes due to thermal expansion of the cylindrical body can be sufficiently absorbed. The gap can alleviate the locally concentrated load applied to the bottom of the piston body due to compression during brake operation, thereby preventing the occurrence of cracks. Also, since the sprayed layer made of coarse metal particles has high damping properties, it is effective against brake noise.
以下図面に示す実施例により本発明を詳述す
る。 The present invention will be explained in detail below with reference to embodiments shown in the drawings.
第１図において１は一端を開口する円筒状のピ
ストン本体でその外側面を摺動面とし、セラミツ
クス焼結体例えばアルミナ焼結体ないしは繊維強
化フエノール樹脂のような繊維強化合成樹脂で製
作されている。２はスチール製でその開口側に鍔
３を有する円筒状の鍔付筒状体で鍔３は通常ピス
トン開口端と称する部分に当る。この筒状体２の
外側の底面及び側面には予めローレツト加工が施
されており、これに例えばニツケル・アルミ複合
体のような金属粗粒からなる火炎溶射層４の粗面
が形成されている。そしてこの筒状体２を図に示
すようにピストン本体１の内側に嵌合して、該ピ
ストン本体１の内面が上記粗面に点接触の状態の
まま上記ピストン本体１とスチール製筒状体２と
を一体化してデイスクブレーキ用ピストンが構成
されてている。 In Fig. 1, reference numeral 1 denotes a cylindrical piston body with one end open, its outer surface serving as a sliding surface, and is made of a ceramic sintered body, such as an alumina sintered body, or a fiber-reinforced synthetic resin such as fiber-reinforced phenolic resin. There is. Reference numeral 2 denotes a cylindrical flanged cylindrical body made of steel and having a flange 3 on its opening side, and the flange 3 corresponds to a portion usually called the opening end of the piston. The outer bottom and side surfaces of this cylindrical body 2 are knurled in advance, on which a rough surface of a flame sprayed layer 4 made of coarse metal particles such as a nickel-aluminum composite is formed. . Then, as shown in the figure, this cylindrical body 2 is fitted inside the piston body 1, and the piston body 1 and the steel cylindrical body are brought into contact with each other while the inner surface of the piston body 1 is in point contact with the rough surface. 2 are integrated to form a disc brake piston.
なお、５はピストンシールの嵌合溝、６はピス
トン空洞部である。 Note that 5 is a fitting groove of the piston seal, and 6 is a piston cavity.
第１図は実施例に示す本発明のデイスクブレー
キ用ピストンを示しイはその平面図、ロは断面図
である。
１……ピストン本体、２……鍔付筒状体、３…
…鍔、４……溶射層、５……嵌合溝、６……ピス
トン空洞部。
FIG. 1 shows a piston for a disc brake according to an embodiment of the present invention, and FIG. 1 is a plan view thereof, and FIG. 1 is a sectional view thereof. 1... Piston body, 2... Flammed cylindrical body, 3...
...Brim, 4...Sprayed layer, 5...Fitting groove, 6...Piston cavity.
Claims (1)
は繊維強化プラスチツク製ピストン本体の内部
に、金属粗粒で溶射被覆して多数の凸部を形成し
た外面を有する一端閉塞のスチール製筒状体を嵌
合してなり、上記ピストン本体の内面は上記多数
の凸部と点接触状態にあることを特徴とするデイ
スクブレーキ用ピストン。 ２ セラミツクスがアルミナ系、ジルコニア系、
ムライト窒化珪素系及び炭化珪素系のうちのいず
れかの焼結体であり、繊維強化プラスチツクが繊
維強化フエノール樹脂である特許請求の範囲１記
載のデイスクブレーキ用ピストン。 ３ 金属粗粒がニツケル・アルミナ複合体、ニツ
ケル・クロム自溶合金、アルミナブロンズ複合
体、亜鉛及びアルミナのうちのいずれかの粗粒で
ある特許請求の範囲１項又は２項記載のデイスク
ブレーキ用ピストン。[Scope of Claims] 1. A cylindrical ceramic or fiber-reinforced plastic piston body with one end open and an outer surface coated with coarse metal particles by thermal spraying to form a large number of convex portions, and one end closed and made of steel. A piston for a disc brake, characterized in that the inner surface of the piston body is in point contact with the plurality of convex portions. 2 Ceramics are alumina-based, zirconia-based,
2. The disc brake piston according to claim 1, wherein the piston is a sintered body of either mullite silicon nitride type or silicon carbide type, and the fiber-reinforced plastic is a fiber-reinforced phenolic resin. 3. The disc brake according to claim 1 or 2, wherein the metal coarse particles are any one of a nickel-alumina composite, a nickel-chromium self-fluxing alloy, an alumina bronze composite, zinc, and alumina. piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58175728A JPS6069334A (en) | 1983-09-22 | 1983-09-22 | Brake piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58175728A JPS6069334A (en) | 1983-09-22 | 1983-09-22 | Brake piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6069334A JPS6069334A (en) | 1985-04-20 |
| JPH0321768B2 true JPH0321768B2 (en) | 1991-03-25 |
Family
ID=16001195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58175728A Granted JPS6069334A (en) | 1983-09-22 | 1983-09-22 | Brake piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6069334A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19534220A1 (en) * | 1995-09-15 | 1997-03-20 | Teves Gmbh Alfred | Brake piston |
| DE29801364U1 (en) * | 1998-01-28 | 1998-03-19 | Lucas Industries P.L.C., Solihull, West Midlands | Actuating piston for a hydraulically and mechanically actuated partial-pad disc brake |
| JP2010078097A (en) * | 2008-09-26 | 2010-04-08 | Advics Co Ltd | Disc brake |
-
1983
- 1983-09-22 JP JP58175728A patent/JPS6069334A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6069334A (en) | 1985-04-20 |
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