JPH02120536A - Piston for disc brake and manufacture thereof - Google Patents
Piston for disc brake and manufacture thereofInfo
- Publication number
- JPH02120536A JPH02120536A JP63275941A JP27594188A JPH02120536A JP H02120536 A JPH02120536 A JP H02120536A JP 63275941 A JP63275941 A JP 63275941A JP 27594188 A JP27594188 A JP 27594188A JP H02120536 A JPH02120536 A JP H02120536A
- Authority
- JP
- Japan
- Prior art keywords
- mouth
- circumferential surface
- piston
- cylindrical
- straight
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000007769 metal material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 238000010273 cold forging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
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
-
- 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は軽量化されたディスクブレーキ用ピストン及び
その製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lightweight piston for a disc brake and a method for manufacturing the same.
（従来の技術）
自動車のディスクブレーキを作動させるためのピストン
は、金属素材を鍛造して得られた中空の有底円筒状のも
のであり、その口部内周縁を肉厚化するとともに口部外
周には防塵ブーツを取り付けるための環状溝を形成した
ものが普通である。(Prior art) A piston for operating an automobile's disc brake is a hollow cylinder with a bottom obtained by forging a metal material.The inner circumference of the mouth is thickened and the outer circumference of the mouth is It is common to have an annular groove for attaching a dustproof boot.
このようなディスクブレーキ用のピストンは、特開昭５
６−７６７３５号公報や特開昭５６−９０１３０号公報
に示されるように、５ＩＯＣ等の金属素材を冷間鍛造に
より有底円筒状に成形したのち、口部を内外両面からロ
ーリング加工して口部外周に環状溝を形成する方法によ
り製造されていた。しかしこの従来法によって製造され
たディスクブレーキ用のピストンは、全体の肉厚がほぼ
均一であるので、口部に強度上必要な肉厚を持たせよう
とするとピストンの胴部や底部等の全体の肉厚を必要以
上に厚くしなければならず、車体軽量化及び素材の歩留
まり向上の観点からその改良が望まれていた。゛
（発明が解決しようとする課題）
本発明はこのような従来の欠点を解決して、口部に必要
な肉厚を保ちつつその他の部分を肉薄化することによっ
て軽量化されたディスクブレーキ用のピストンを提供す
ることを第１の目的とするものである。また本発明はこ
のようなピストンを効率良く製造することができるディ
スクブレーキ用ピストンの製造法を提供することを第２
の目的とするものである。This type of piston for disc brakes was developed in Japanese Patent Application Publication No. 5
As shown in JP-A-6-76735 and JP-A-56-90130, a metal material such as 5IOC is cold-forged into a cylindrical shape with a bottom, and then the opening is rolled from both the inside and outside to form the opening. It was manufactured by a method of forming an annular groove on the outer periphery of the part. However, disc brake pistons manufactured using this conventional method have a nearly uniform wall thickness over the entire body, so if you want to give the mouth the thickness necessary for strength, the entire body, bottom, etc. of the piston will need to be thickened. The wall thickness of the vehicle must be made thicker than necessary, and improvements have been desired from the viewpoints of reducing the weight of the vehicle body and improving the yield of materials. (Problems to be Solved by the Invention) The present invention solves these conventional drawbacks and provides a lightweight disc brake by maintaining the necessary wall thickness at the mouth and thinning other parts. The first object of the present invention is to provide a piston of the present invention. A second object of the present invention is to provide a method for manufacturing a piston for a disc brake that can efficiently manufacture such a piston.
This is the purpose of
（課題を解決するための手段）
上記の課題を達成するためになされた第１の発明は、外
周面が口部外周面に切削加工された環状溝を持つストレ
ートな円筒面であり、内周面は全体が鍛造加工面であっ
てその口部内周縁のみに肉厚部が形成されるとともにそ
れに続く胴部内周面は口部内周縁よりも大径の円筒面と
され、これにより胴部を肉薄としたことを特徴とするも
のである。(Means for Solving the Problem) A first invention made to achieve the above-mentioned problem is that the outer peripheral surface is a straight cylindrical surface having an annular groove cut on the outer peripheral surface of the mouth part, and the inner peripheral surface is a straight cylindrical surface. The whole surface is a forged surface, and a thick part is formed only at the inner periphery of the mouth, and the inner periphery of the body that follows it is a cylindrical surface with a larger diameter than the inner periphery of the mouth, which makes the body thinner. It is characterized by the following.
また第２の発明は、金属素材を冷間鍛造して有底円筒状
体を作成したうえこれをアイヨニングしてその口部外周
縁に肉厚部を形成し、次にこの有底円筒状体の内部に口
部がやや細径とされた半径方向に開閉できるポンチを挿
入したうえで外周面を逆絞りして外周面がストレートで
口部内周縁に肉厚部が形成されたピストンを得ることを
特徴とするものである。In addition, the second invention involves cold forging a metal material to create a cylindrical body with a bottom, and then eyeloning this to form a thick part on the outer periphery of the mouth. A piston with a straight outer circumferential surface and a thick wall formed on the inner circumferential edge of the mouth is obtained by inserting a punch with a slightly narrower mouth that can be opened and closed in the radial direction into the inside of the piston, and then drawing the outer circumferential surface in reverse. It is characterized by:
次に本発明を製造工程を示す図面を参照しつつ更に詳細
に説明する。Next, the present invention will be explained in more detail with reference to drawings showing manufacturing steps.
本発明においては、まず第１図に示すように５１０Ｃ等
の丸棒状の金属素材（１）をギロチンシャーによって所
定寸法に切断する。次に第２図に示すように切断された
金属素材（１）をすえ込み加工して偏平な予備成形体（
２）とするとともに、塑性加工上金属素材（１）の鍛流
を正常化させる。次にこれを金型とポンチにより冷間鍛
造して、第３図に示されるような内外両面がともにスト
レートな有底円筒状体（３）を作成したうえ、これをア
イヨニング（しごき加工）して内周面をストレートな形
状に保つたままで口部外周縁に肉厚部（４）を形成する
。このときに有底円筒状＃ （３）の胴部及び底部の肉
厚を口部の肉厚に比較して十分に薄＜シ、軽量化を図る
ことができる０次に口部外周縁に肉厚部（４）が形成さ
れた有底円筒状体（３）の内部に、第５図に示されるよ
うに半径方向に開閉できるポンチ（５）を挿入する。ポ
ンチ（５）は口部がやや細径とされた複数個の分割片か
らなるもので、各分割片は相互に引張ばね（６）によっ
て中心に引き寄せられているが、中心部にテーバ状の拡
開部材（７）がシリンダ等により押し込まれると第５図
に示されるとおり半径方向に拡開することができるもの
である。このようなポンチ（５）を有底円筒状体（３）
の内部に挿入して拡開させた状態で、ストレートな円筒
状の内周面を持つ総形ダイス（８）を用いて有底円筒状
体（３）の外周面が逆絞りされる。この結果、第４図に
示された有底円筒状体（３）の口部外周縁の肉厚部（４
）はポンチ（５）のやや細径とされた口部に向かって絞
り込まれ、外周面がストレートで口部内Ｆ１縁に肉厚部
（９）が形成されたピストンが得られる。そこでポンチ
（５）の拡間部材（７）を後退させて引張ばね（６）の
力によって各分割片を中心に向かって移動させたうえポ
ンチ（５）を抜き出す。その後に口部外周に機械加工に
よって環状溝θＦを形成するとともにその外周面を研摩
加工すれば、第６図に示されるような外周面がストレー
トな円筒面であり、内周面は全体が鍛造加工面であって
その口部内周縁のみに肉厚部（９）が形成されるととも
にそれに続く胴部内周面（１１）は口部内周縁よりも大
径の円筒面とされた完成品が得られることになる。In the present invention, first, as shown in FIG. 1, a round bar-shaped metal material (1) such as 510C is cut into a predetermined size using a guillotine shear. Next, as shown in Figure 2, the cut metal material (1) is swaged into a flat preform (
2) and normalizes the grain flow of the metal material (1) during plastic working. Next, this was cold-forged using a die and a punch to create a bottomed cylindrical body (3) with straight inner and outer surfaces as shown in Figure 3, which was then ironed. A thick portion (4) is formed on the outer peripheral edge of the mouth while keeping the inner peripheral surface in a straight shape. At this time, the wall thickness of the body and bottom of the bottomed cylindrical # (3) should be sufficiently thin compared to the wall thickness of the mouth, and the outer periphery of the mouth should be thin enough to reduce weight. A punch (5) that can be opened and closed in the radial direction is inserted into the bottomed cylindrical body (3) in which the thick portion (4) is formed, as shown in FIG. The punch (5) is made up of a plurality of divided pieces each having a slightly narrower mouth, and each divided piece is pulled toward the center by a tension spring (6). When the expanding member (7) is pushed in by a cylinder or the like, it can expand in the radial direction as shown in FIG. A punch like this (5) is attached to a cylindrical body (3) with a bottom.
In the expanded state, the outer circumferential surface of the bottomed cylindrical body (3) is reversely drawn using a full-form die (8) having a straight cylindrical inner circumferential surface. As a result, the thick part (4) of the outer peripheral edge of the mouth of the bottomed cylindrical body (3) shown in
) is narrowed toward the slightly narrower diameter mouth of the punch (5) to obtain a piston with a straight outer circumferential surface and a thick wall portion (9) formed on the inner edge F1 of the mouth. Then, the expanding member (7) of the punch (5) is moved backward, each divided piece is moved toward the center by the force of the tension spring (6), and the punch (5) is extracted. After that, if an annular groove θF is formed by machining on the outer circumference of the mouth and the outer circumferential surface is polished, the outer circumferential surface becomes a straight cylindrical surface as shown in Fig. 6, and the inner circumferential surface is entirely forged. A finished product is obtained in which a thick wall portion (9) is formed only on the inner circumferential edge of the mouth portion of the processed surface, and the inner circumferential surface (11) of the body that follows it is a cylindrical surface having a larger diameter than the inner circumferential edge of the mouth portion. It turns out.
なお、すえ込み成形及び冷間鍛造工程に先立ち、焼なま
し工程を適宜介在させることは言うまでもないことであ
る。Note that it goes without saying that an annealing process is appropriately performed prior to the swaging forming and cold forging processes.
（発明の効果）
以上に説明したように、本発明によれば有底円筒状体の
アイヨニングにより口部外周縁に肉厚部を形成したのち
に、逆絞りを行なうことにより、外周面がストレートで
口部内周縁に肉厚部が形成され、かつそれに続く胴部内
周面は口部内周縁よりも大径の円筒面とされたピストン
を得ることができるので、口部の肉厚を保ちつつその他
の胴部や底部の肉厚を十分に薄くすることができる。従
って本発明のピストンは口部の強度を損なうことな〈従
来品に対して約１５％〜３０％も軽量化を図ることがで
き、これによる車体のばね下部型の軽減効果及び素材の
節減効果はきわめて大きいものである。また本発明にお
いては外周面の逆絞りによってストレートな外周面を形
成するので、ピストンとして最も高い寸法精度が要求さ
れる外周面を高精度に仕上げることができ、その後の研
摩工程もごく簡単に行うことが可能である。(Effects of the Invention) As described above, according to the present invention, a thick portion is formed on the outer periphery of the mouth by eyeloning of a cylindrical body with a bottom, and then reverse drawing is performed to make the outer periphery straight. This makes it possible to obtain a piston in which a thick wall is formed on the inner periphery of the mouth, and the inner periphery of the body following the thick part is a cylindrical surface with a larger diameter than the inner periphery of the mouth. The wall thickness of the body and bottom can be made sufficiently thin. Therefore, the piston of the present invention can reduce the weight by about 15% to 30% compared to conventional products without compromising the strength of the mouth part, which has the effect of reducing the unsprung part of the car body and saving material. is extremely large. In addition, in the present invention, since a straight outer circumferential surface is formed by reverse drawing of the outer circumferential surface, the outer circumferential surface, which requires the highest dimensional accuracy for a piston, can be finished with high precision, and the subsequent polishing process can be performed very easily. Is possible.
よって本発明は従来の問題点を一掃したディスクブレー
キ用ピストンおよびその製造法として、産業の発展に寄
与するところは極めて大きい°ものである。Therefore, the present invention greatly contributes to the development of industry as a piston for disc brakes and a method for manufacturing the same which eliminates the problems of the conventional pistons.
第１図は切断された金属素材の正面図、第２図はすえ込
み加工された金属素材の正面図、第３図、第４図、第５
図はその成形工程を示す断面図、第６図は得られたピス
トンの一部切欠正面図である。
（１）二金属素材、（３）：有底円筒状体、（４）：肉
厚部、（５）ポンチ、（９）：肉厚部、０ω：環状溝、
θ０：胴部外周面。Figure 1 is a front view of the cut metal material, Figure 2 is a front view of the swaged metal material, Figures 3, 4, and 5.
The figure is a sectional view showing the molding process, and FIG. 6 is a partially cutaway front view of the obtained piston. (1) Bimetallic material, (3): Bottomed cylindrical body, (4): Thick part, (5) Punch, (9): Thick part, 0ω: Annular groove,
θ0: outer peripheral surface of the trunk.
Claims (1)
ストレートな円筒面であり、内周面は全体が鍛造加工面
であってその口部内周縁のみに肉厚部が形成されるとと
もにそれに続く胴部内周面は口部内周縁よりも大径の円
筒面とされ、これにより胴部を肉薄としたことを特徴と
するディスクブレーキ用ピストン。 ２、金属素材を冷間鍛造して有底円筒状体を作成したう
えこれをアイヨニングしてその口部外周縁に肉厚部を形
成し、次にこの有底円筒状体の内部に口部がやや細径と
された半径方向に開閉できるポンチを挿入したうえで外
周面を逆絞りして外周面がストレートで口部内周縁に肉
厚部が形成されたピストンを得ることを特徴とするディ
スクブレーキ用ピストンの製造法。[Claims] 1. The outer circumferential surface is a straight cylindrical surface with an annular groove cut into the outer circumferential surface of the mouth, and the inner circumferential surface is entirely a forged surface, with only the inner circumferential edge of the mouth being a straight cylindrical surface. A piston for a disc brake, characterized in that the thick part is formed and the inner circumferential surface of the body following the thick part is a cylindrical surface having a larger diameter than the inner circumferential edge of the mouth part, thereby making the body part thinner. 2. Cold forge a metal material to create a cylindrical body with a bottom, then eyeon this to form a thick part on the outer periphery of the mouth, and then form a mouth inside the cylindrical body with a bottom. A disk characterized by inserting a punch that can be opened and closed in the radial direction and having a slightly smaller diameter, and then drawing the outer circumferential surface in reverse to obtain a piston with a straight outer circumferential surface and a thick walled portion on the inner circumferential edge of the mouth. Manufacturing method for brake pistons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275941A JPH02120536A (en) | 1988-10-31 | 1988-10-31 | Piston for disc brake and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275941A JPH02120536A (en) | 1988-10-31 | 1988-10-31 | Piston for disc brake and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02120536A true JPH02120536A (en) | 1990-05-08 |
Family
ID=17562563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63275941A Pending JPH02120536A (en) | 1988-10-31 | 1988-10-31 | Piston for disc brake and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02120536A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08300083A (en) * | 1995-05-08 | 1996-11-19 | Gooshiyuu:Kk | Manufacture of inner gear |
| WO1997028386A1 (en) * | 1996-02-01 | 1997-08-07 | Itt Manufacturing Enterprises, Inc. | Cold-formed piston for a hydraulic brake |
| US6491144B2 (en) * | 2000-06-30 | 2002-12-10 | Shimano Inc. | Piston assembly for a disc brake |
| WO2003015980A1 (en) * | 2001-08-08 | 2003-02-27 | Lucas Automotive Gmbh | Hydraulic piston consisting of rolled sheet metal, method for producing the same and an intermediate product obtained by said method |
| JP2007024285A (en) * | 2005-07-21 | 2007-02-01 | Hosei Brake Ind Ltd | Sealing structure |
| JP2009520931A (en) * | 2005-12-21 | 2009-05-28 | コンチネンタル・テベス・アーゲー・ウント・コンパニー・オーハーゲー | Piston for hydraulic brake and manufacturing method thereof |
| JP2013212743A (en) * | 2012-03-30 | 2013-10-17 | Nissin Kogyo Co Ltd | Simulator piston |
| CN105387102A (en) * | 2015-12-17 | 2016-03-09 | 芜湖盛力科技股份有限公司 | Piston of spring brake air chamber parking cavity of truck braking system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690130A (en) * | 1980-12-03 | 1981-07-22 | Akebono Brake Ind Co Ltd | Forged piston for disc brake |
-
1988
- 1988-10-31 JP JP63275941A patent/JPH02120536A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690130A (en) * | 1980-12-03 | 1981-07-22 | Akebono Brake Ind Co Ltd | Forged piston for disc brake |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08300083A (en) * | 1995-05-08 | 1996-11-19 | Gooshiyuu:Kk | Manufacture of inner gear |
| WO1997028386A1 (en) * | 1996-02-01 | 1997-08-07 | Itt Manufacturing Enterprises, Inc. | Cold-formed piston for a hydraulic brake |
| US6491144B2 (en) * | 2000-06-30 | 2002-12-10 | Shimano Inc. | Piston assembly for a disc brake |
| WO2003015980A1 (en) * | 2001-08-08 | 2003-02-27 | Lucas Automotive Gmbh | Hydraulic piston consisting of rolled sheet metal, method for producing the same and an intermediate product obtained by said method |
| US7000526B2 (en) | 2001-08-08 | 2006-02-21 | Lucas Automotive Gmbh | Hydraulic piston made from rolled sheet metal, method for its manufacture and intermediate product of the method |
| CN100368142C (en) * | 2001-08-08 | 2008-02-13 | 卢卡斯汽车股份有限公司 | Hydraulic piston consisting of rolled sheet metal, method for producing the same and an intermediate product obtained by said method |
| JP2007024285A (en) * | 2005-07-21 | 2007-02-01 | Hosei Brake Ind Ltd | Sealing structure |
| JP2009520931A (en) * | 2005-12-21 | 2009-05-28 | コンチネンタル・テベス・アーゲー・ウント・コンパニー・オーハーゲー | Piston for hydraulic brake and manufacturing method thereof |
| KR101237265B1 (en) * | 2005-12-21 | 2013-02-27 | 잔더 움포름테크니크 게엠베하 운트 코. 카게 | Piston for a hydraulic brake and method for production thereof |
| JP2013212743A (en) * | 2012-03-30 | 2013-10-17 | Nissin Kogyo Co Ltd | Simulator piston |
| CN105387102A (en) * | 2015-12-17 | 2016-03-09 | 芜湖盛力科技股份有限公司 | Piston of spring brake air chamber parking cavity of truck braking system |
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