JPH01228634A - Manufacture of piston for wheel cylinder - Google Patents
Manufacture of piston for wheel cylinderInfo
- Publication number
- JPH01228634A JPH01228634A JP63052678A JP5267888A JPH01228634A JP H01228634 A JPH01228634 A JP H01228634A JP 63052678 A JP63052678 A JP 63052678A JP 5267888 A JP5267888 A JP 5267888A JP H01228634 A JPH01228634 A JP H01228634A
- Authority
- JP
- Japan
- Prior art keywords
- groove
- piston
- small diameter
- forging
- center
- 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 description 4
- 238000005242 forging Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 7
- 239000003566 sealing material Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007858 starting material Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Forging (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
〔作業上の利用分野〕
本発明は、車両等の゛ブレーキ装置に使用されるホイー
ルシリンダ用ピストンの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to a method of manufacturing a piston for a wheel cylinder used in a brake device of a vehicle or the like.
ブレーキペダルの踏み込みによりマスクシリンダ内に発
生する液圧を導入してブレーキシューを駆動するために
用いるこの種のホイールシリンダは、例えば、実公昭５
６−４４９１１号公報に示されているように、両端が開
口し中央部分に液口を有するシリンダ本体と、該シリン
ダのシリンダ孔内に摺動自在に挿入され、相互間に液室
を区画する２個のピストン、両ピストンの対向面間にカ
ップシールを介在して介装され該両ピストンを離間する
向きのばね力を及ぼすばね、及びシリンダ本体の両端と
各ピストンに亘って設けられたブーツを有している。こ
のピストンは、上記シリンダ孔の内周面と摺動する大径
部と該大径部から延びシリンダ本体外へ突出する小径部
を有し、該小径部が、その端面に、ブレーキシューを案
内するためのシュー案内溝を有し、周部に上記ブーツの
一端部が嵌合するブーツ嵌合溝を有する形状に形成され
ている。This type of wheel cylinder, which is used to drive the brake shoes by introducing the hydraulic pressure generated in the mask cylinder when the brake pedal is depressed, is known as
As shown in Japanese Patent No. 6-44911, a cylinder main body that is open at both ends and has a liquid port in the center, and a cylinder body that is slidably inserted into the cylinder hole of the cylinder and partitions a liquid chamber between them. two pistons, a spring interposed between opposing surfaces of both pistons with a cup seal interposed therebetween and exerting a spring force in a direction to separate the two pistons, and a boot provided across both ends of the cylinder body and each piston. have. This piston has a large diameter part that slides on the inner peripheral surface of the cylinder hole, and a small diameter part that extends from the large diameter part and projects outside the cylinder body, and the small diameter part has an end surface thereof that guides the brake shoe. The boot has a shoe guide groove for inserting the shoe into the boot, and has a boot fitting groove on the circumference into which one end of the boot fits.
このような端部形状を有する上記ピストンの該端部は、
従来、ピストン素材（鉄系金属など）から機械加工によ
り形成しているので、歩留りが悪（、生産性が低いとい
う問題があった。The end of the piston having such an end shape is
Conventionally, pistons have been formed by machining from a piston material (such as iron-based metal), which has led to the problem of poor yield (and low productivity).
本発明は上記問題を解消するためになされたもので、従
来に比し、高い生産性をもって作ることができるホイー
ルシリンダ用ピストンの製造方法を提供することを目的
とする。The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a wheel cylinder piston that can be manufactured with higher productivity than conventional methods.
本発明は上記目的を達成するため、大径部と小径部を有
するピストン素材の該小径部の端面に鍛造により直径方
向の溝を形成し、該溝は中央部に凹みを有する溝とし、
次いで、この溝を鍛造により平坦にするようにしたもの
である。In order to achieve the above object, the present invention forms a diametrical groove by forging on the end face of the small diameter part of a piston material having a large diameter part and a small diameter part, and the groove is a groove having a recess in the center part.
Next, this groove is made flat by forging.
本発明では、ピストンの小径部に、シュー案内溝とブー
ツ嵌合部とを、鍛造によって形成するので、ピストン素
材の小径部の太さが従来に比して細くて済み、その分、
歩留りが向上する。In the present invention, since the shoe guide groove and the boot fitting part are formed by forging in the small diameter part of the piston, the thickness of the small diameter part of the piston material can be thinner than in the past.
Yield is improved.
以下、本発明の一実施例を図面を参照して説明する。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図〜第４図において、１はホイールシリンダのシリ
ンダ本体であって、両端２および３に開口するシリンダ
孔４を有し、はぼ中央部にブレーキ液が流通する液口５
が形成されている。シリンダ孔４には同形かつ同大の２
個のピストン６と７が摺動自在に挿入されている。ピス
トン６と７は大径部８と小径部９を有する段付きピスト
ンであって、小径部９は、その端部の外周部に突起１０
．１０を有し、端面にシュー案内溝１１を有する形状に
形成されている。ピストン５と７の大径部８の端面はシ
リンダ孔４内で対向して該シリンダ孔４内に上記液口５
が開口する液室１２を区画し、小径部９の端部はシリン
ダ孔４から外部に突出している。１３はばねであって、
一端はシール材１４をばね座とし、他端はシール材１５
をばね座として両ピストン６と７の大径部８間に介在し
ており、ピストン６に対しシール材１４を押圧し、該シ
ール材を介して外方に向う押力を付与するとともにピス
トン７に対してシール材１５を押圧し該シール材１５を
介して外方に向う押力を付与している。１６と１７はブ
ーツであって、ブーツ１６は、その一端の嵌合部１６Ａ
がシリンダ本体１の一端に形成されたフランジ部ＩＡを
乗り超えて該シリンダ本体１に嵌合し、他端の嵌合部１
６Ｂがピストン６の小径部９の突起ｌＯと大径部８との
間に嵌合されている。ブーツ１７も、その−端の嵌合部
１７Ａがシリンダ本体１の他端に形成されたフランジ部
ＩＢを乗り超えて該シリンダ本体１に嵌合し、他端の嵌
合部１７Ｂがピストン７の小径部９の突起１０と大径部
８との間に嵌合されている。In FIGS. 1 to 4, reference numeral 1 denotes a cylinder body of a wheel cylinder, which has a cylinder hole 4 that opens at both ends 2 and 3, and a fluid port 5 through which brake fluid flows in the center.
is formed. The cylinder hole 4 has two holes of the same shape and size.
Pistons 6 and 7 are slidably inserted. The pistons 6 and 7 are stepped pistons having a large diameter part 8 and a small diameter part 9, and the small diameter part 9 has a projection 10 on the outer periphery of its end.
．． 10, and is formed in a shape having a shoe guide groove 11 on the end surface. The end surfaces of the large diameter portions 8 of the pistons 5 and 7 face each other in the cylinder hole 4, and the liquid port 5 is inserted into the cylinder hole 4.
defines an open liquid chamber 12, and the end of the small diameter portion 9 projects outward from the cylinder hole 4. 13 is a spring,
One end uses sealing material 14 as a spring seat, and the other end uses sealing material 15.
is interposed between the large diameter portions 8 of both pistons 6 and 7 as a spring seat, and presses the sealing material 14 against the piston 6, applying an outward pushing force through the sealing material, and The sealing material 15 is pressed against the sealing material 15, and a pushing force directed outward is applied via the sealing material 15. 16 and 17 are boots, and the boot 16 has a fitting part 16A at one end thereof.
fits into the cylinder body 1 by going over the flange part IA formed at one end of the cylinder body 1, and the fitting part 1 at the other end
6B is fitted between the projection lO of the small diameter portion 9 of the piston 6 and the large diameter portion 8. The boot 17 also has a fitting portion 17A at its lower end that goes over the flange portion IB formed at the other end of the cylinder body 1 and fits into the cylinder body 1, and a fitting portion 17B at the other end that fits into the cylinder body 1. It is fitted between the projection 10 of the small diameter part 9 and the large diameter part 8.
両ピストン６と７は、第５図に示すように、図示しない
棒状の素材から切り出されるピストン素材（ロッド状の
大径部８とロッド状の小径部９Ａからなる段付きのピス
トン素材）２０から、下記に述べる工程に従い、鍛造に
より形成する。As shown in FIG. 5, both pistons 6 and 7 are made from a piston material 20 (a stepped piston material consisting of a rod-shaped large diameter portion 8 and a rod-shaped small diameter portion 9A) cut out from a rod-shaped material (not shown). , formed by forging according to the steps described below.
即ち、まず、上記ピストン素材２０の小径部９への端面
に、該端面の中心を通り直径方向に延びる所定ｒｐＷの
溝２１ （第６図（ａｌに示す）を鍛造により形成する
。この溝２１は第６図（ｂ）に示すように、その長手方
向中央部が所定長さしに亘り、所定深さＨを有する凹部
２２となっている。That is, first, a groove 21 (shown in FIG. 6 (al)) of a predetermined rpW extending diametrically through the center of the end surface is formed on the end surface of the piston material 20 toward the small diameter portion 9 by forging. As shown in FIG. 6(b), the center portion in the longitudinal direction is a recessed portion 22 extending over a predetermined length and having a predetermined depth H.
次いで、鍛造により、上記溝２１の溝底を平坦面とする
。上記溝底は、叩かれることにより、−部が溝外方にせ
り出して、突起１０．１０となり、一部は凹部２２を埋
めるようになり、溝２１は平坦な溝底を有するシュー案
内溝１１となる。Next, the groove bottom of the groove 21 is made into a flat surface by forging. When the groove bottom is struck, the - part protrudes outward to form a protrusion 10, 10, which partially fills the recess 22, and the groove 21 is formed into a shoe guide groove 11 with a flat groove bottom. becomes.
このホイールシリンダは、ブレーキペダルの踏み込みに
より液圧を発生するマスクシリンダに接続されて使用さ
れ、上記液圧は配管（図示しない）を通して液口５から
液室１２に伝達される。液室１２に導入された液圧によ
って、ピストン６と７がシリンダ孔４の左右外方へ移動
し、ブレーキシューを図示していないブレーキドラムに
押圧する。This wheel cylinder is used by being connected to a mask cylinder that generates hydraulic pressure when the brake pedal is depressed, and the hydraulic pressure is transmitted from the liquid port 5 to the liquid chamber 12 through piping (not shown). The hydraulic pressure introduced into the liquid chamber 12 causes the pistons 6 and 7 to move outward from the left and right of the cylinder hole 4, pressing the brake shoes against a brake drum (not shown).
ブレーキペダルの上記踏込みが解除されて発生していた
上記マスクシリンダの上記液圧が消滅すると、ホイール
シリンダの液圧も消滅し、ブレーキシューは図示しない
戻しばねによって元の位置に戻り、ピストン６と７ばば
ね１３の作用により元の位置に戻る。When the brake pedal is released and the hydraulic pressure in the mask cylinder disappears, the hydraulic pressure in the wheel cylinder also disappears, and the brake shoe returns to its original position by a return spring (not shown), and the piston 6 and 7 It returns to its original position by the action of spring 13.
本実施例におけるピストン６．７の小径部９の端部形状
は、ピストン素材２０の小径部９Ａの端面に溝２１を鍛
造で形成し、次工程で、この溝２１の凹部２２が潰れる
まで鍛造して形成するので、ピストン素材２０の小径部
９Ａの径は、従来のピストン素材の小径部を切削して形
成していたピストンの小径部の前記ブーツ嵌合部分の大
きさでよく、その分、歩留りが向上する。The shape of the end of the small diameter portion 9 of the piston 6.7 in this embodiment is such that a groove 21 is formed on the end surface of the small diameter portion 9A of the piston material 20 by forging, and in the next step, the groove 21 is forged until the concave portion 22 of this groove 21 is crushed. Therefore, the diameter of the small diameter portion 9A of the piston material 20 may be the same as the size of the boot fitting portion of the small diameter portion of the piston, which was formed by cutting the small diameter portion of the piston material in the past. , yield is improved.
なお、出発素材を大径部８と小径部９Ａとからなるピス
トン素材２０を用いているが、このピストン素材２０の
形成にあたって、大径部８のみの素材の一部を鍛造によ
って小径部９Ａとするようにしてもよい。Note that the piston material 20 consisting of the large diameter portion 8 and the small diameter portion 9A is used as a starting material, but in forming the piston material 20, a part of the material only for the large diameter portion 8 is forged to form the small diameter portion 9A. You may also do so.
本発明は以上説明した通り、ピストンのシリンダ孔から
外方に突出する小径部の端部部分の形状をピストン素材
から、切削加工することなく、鍛造により形成するので
、歩留りが高く、従来に比し、生産性を高めることがで
きる。As explained above, the present invention forms the shape of the end portion of the small diameter portion that protrudes outward from the cylinder hole of the piston from the piston material by forging without cutting, so the yield is high and compared to the conventional method. and increase productivity.
第１図は本発明の実施例を示す平面図、第２図は上記実
施例の断面図、第３図は上記実施例におけるピストンの
側面図、第４図は上記実施例におけるピストンの端面図
、第５図は上記実施例におけるピストンの素材を示す側
面図、第６図ｔａ）と（ｂ）は上記ピストンを製作する
工程を説明するための図である。
６．７−ピストン、８−・−大径部、９−・〜小径部、
１１．２１・−溝。Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a sectional view of the above embodiment, Fig. 3 is a side view of the piston in the above embodiment, and Fig. 4 is an end view of the piston in the above embodiment. , FIG. 5 is a side view showing the material of the piston in the above embodiment, and FIGS. 6(a) and 6(b) are views for explaining the process of manufacturing the above piston. 6.7-piston, 8-・-large diameter part, 9-・～small diameter part,
11.21・- Groove.
Claims (1)
に延び中央部が凹んだ溝を鍛造により形成する第１工程
と、鍛造により前記溝を平坦にし溝外方に突部を形成す
る第２工程とを有するホィールシリンダ用ピストンの製
造方法。A first step of forming, by forging, a groove extending in the diametrical direction and having a concave center at the end of the small diameter part of a material having a large diameter part and a small diameter part, and flattening the groove by forging and forming a protrusion on the outside of the groove. a second step of forming a piston for a wheel cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63052678A JPH01228634A (en) | 1988-03-08 | 1988-03-08 | Manufacture of piston for wheel cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63052678A JPH01228634A (en) | 1988-03-08 | 1988-03-08 | Manufacture of piston for wheel cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01228634A true JPH01228634A (en) | 1989-09-12 |
Family
ID=12921541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63052678A Pending JPH01228634A (en) | 1988-03-08 | 1988-03-08 | Manufacture of piston for wheel cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01228634A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422693A (en) * | 2015-12-22 | 2016-03-23 | 芜湖恒坤汽车部件有限公司 | Brake wheel cylinder provided with guide pin |
| CN105443620A (en) * | 2015-12-22 | 2016-03-30 | 芜湖恒坤汽车部件有限公司 | Double-spring brake wheel cylinder |
| CN105508472A (en) * | 2015-12-22 | 2016-04-20 | 芜湖恒坤汽车部件有限公司 | Vehicle brake wheel cylinder |
| CN105570355A (en) * | 2015-12-22 | 2016-05-11 | 芜湖恒坤汽车部件有限公司 | Automobile brake wheel cylinder set |
-
1988
- 1988-03-08 JP JP63052678A patent/JPH01228634A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422693A (en) * | 2015-12-22 | 2016-03-23 | 芜湖恒坤汽车部件有限公司 | Brake wheel cylinder provided with guide pin |
| CN105443620A (en) * | 2015-12-22 | 2016-03-30 | 芜湖恒坤汽车部件有限公司 | Double-spring brake wheel cylinder |
| CN105508472A (en) * | 2015-12-22 | 2016-04-20 | 芜湖恒坤汽车部件有限公司 | Vehicle brake wheel cylinder |
| CN105570355A (en) * | 2015-12-22 | 2016-05-11 | 芜湖恒坤汽车部件有限公司 | Automobile brake wheel cylinder set |
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