JPH0558874B2 - - Google Patents

Info

Publication number
JPH0558874B2
JPH0558874B2 JP3337267A JP33726791A JPH0558874B2 JP H0558874 B2 JPH0558874 B2 JP H0558874B2 JP 3337267 A JP3337267 A JP 3337267A JP 33726791 A JP33726791 A JP 33726791A JP H0558874 B2 JPH0558874 B2 JP H0558874B2
Authority
JP
Japan
Prior art keywords
cylinder
hole
cylinder body
punch
small hole
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 - Fee Related
Application number
JP3337267A
Other languages
Japanese (ja)
Other versions
JPH0516100A (en
Inventor
Akira Igarashi
Takahisa Yamabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissin Kogyo Co Ltd
Original Assignee
Nissin Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissin Kogyo Co Ltd filed Critical Nissin Kogyo Co Ltd
Priority to JP33726791A priority Critical patent/JPH0516100A/en
Publication of JPH0516100A publication Critical patent/JPH0516100A/en
Publication of JPH0558874B2 publication Critical patent/JPH0558874B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】【0001】

【産業上の利用分野】 本発明は、自動車、自動
二輪車のブレーキ用マスタシリンダ等に用いられ
るシリンダ体、特にシール部材を介してピストン
が摺動自在に嵌合するシリンダ孔を有するもの
に、そのシリンダ孔の内周面に開口する小孔を形
成するようにした、シリンダ体への小孔形成方法
に関する。
[Field of Industrial Application] The present invention relates to cylinder bodies used in master cylinders for brakes of automobiles and motorcycles, particularly cylinder bodies having a cylinder hole into which a piston is slidably fitted via a seal member. The present invention relates to a method for forming a small hole in a cylinder body, in which a small hole is formed in the inner peripheral surface of a cylinder hole.

【0002】【0002】

【従来の技術】 一般にブレーキ作動用マスタシ
リンダのシリンダ体は、例えば実公昭59−9967号
公報に示されているように、シリンダ孔と外部の
オイルリザーバとの間を連通する小孔としてのリ
リーフポート(直径0.5mm程度)が側壁に穿設さ
れており、このリリーフポートの開口部を横切る
ようにシリンダ孔内周面をピストンがシール部材
を介して往復摺動するようになつている。
[Prior Art] Generally, the cylinder body of a master cylinder for brake operation has a relief as a small hole that communicates between the cylinder hole and an external oil reservoir, as shown in Japanese Utility Model Publication No. 59-9967, for example. A port (about 0.5 mm in diameter) is bored in the side wall, and the piston reciprocates on the inner peripheral surface of the cylinder hole via a seal member so as to cross the opening of this relief port.

【0003】 ところで、従来のマスタシリンダのシ
リンダ体では、上記リリーフポートのシリンダ孔
側開口縁がエツジ状に形成されている。これは、
シリンダ体を製作する際、シリンダ体の外側から
ドリルやポンチ等によりリリーフポートを穿設
し、次いで該ポートのシリンダ孔側開口部に生じ
たばりを除去するためにシリンダ孔の内周面をホ
ーニング等の仕上加工を行つていた結果による。
即ち、仕上加工によりリリーフポートのシリンダ
孔側の開口縁のばりは除去されるが、その開口縁
は鋭いエツジ状に形成される。
[0003] By the way, in the cylinder body of the conventional master cylinder, the opening edge of the relief port on the cylinder hole side is formed into an edge shape. this is,
When manufacturing the cylinder body, a relief port is drilled from the outside of the cylinder body using a drill or punch, and then the inner peripheral surface of the cylinder hole is honed to remove any burrs that have formed at the opening of the port on the cylinder hole side. This is due to the results of finishing operations such as
That is, although the burrs on the opening edge of the relief port on the cylinder hole side are removed by finishing, the opening edge is formed into a sharp edge shape.

【0004】【0004】

【発明が解決しようとする課題】 従来のマスタ
シリンダにおいて、長期間使用のものを検査して
みると、ピストンのシール部材に傷付きが屡々発
見され、その一因として、ピストンの往復動に伴
いシール部材がリリーフポートに前記エツジ状開
口縁で削られることが究明された。
[Problems to be Solved by the Invention] When inspecting conventional master cylinders that have been used for a long period of time, damage to the sealing member of the piston is often found. It has been determined that the seal member is cut into the relief port by the edge-like opening edge.

【0005】 本発明は、斯かる事情に鑑みてなされ
たもので、シリンダ孔を摺動するピストンのシー
ル部材の損傷を防ぐことができ、しかもリリーフ
ポート等の小孔をシリンダ側壁に精度良く簡単に
穿設できるようにした、シリンダ体への小孔形成
方法を提供することを目的とする。
[0005] The present invention was made in view of such circumstances, and can prevent damage to the sealing member of the piston that slides in the cylinder hole, and can easily and accurately form small holes such as relief ports on the cylinder side wall. It is an object of the present invention to provide a method for forming a small hole in a cylinder body, which enables the formation of small holes in a cylinder body.

【0006】【0006】

【課題を解決するための手段】 上記目的を達成
するために本発明は、シール部材を介してピスト
ンが摺動自在に嵌合するシリンダ孔を有するシリ
ンダ体に、そのシリンダ孔の内周面に開口する小
孔を形成するようにした、シリンダ体への小孔形
成方法において、前記シリンダ体の側壁外面に設
けた凹部に対応して該側壁に予め形成される薄肉
部に、シリンダ孔内部からポンチを打ち込んで該
ポンチの先端部により前記小孔を穿ち、次いで同
ポンチの先端部に連なる漏斗状頚部を前記小孔の
シリンダ孔側の開口縁に押圧して該開口縁を、シ
リンダ孔に向つて拡径するラツパ状に形成するこ
とを特徴とする。
[Means for Solving the Problems] In order to achieve the above object, the present invention provides a cylinder body having a cylinder hole into which a piston is slidably fitted via a sealing member. In a method for forming a small hole in a cylinder body, in which a small hole is formed in a cylinder body, a small hole is formed in a thin wall portion formed in advance on the side wall of the cylinder body in correspondence with a recess provided on the outer surface of the side wall of the cylinder body from inside the cylinder hole. Drill a punch to make the small hole with the tip of the punch, and then press the funnel-shaped neck connected to the tip of the punch against the opening edge of the small hole on the cylinder hole side to make the opening edge into the cylinder hole. It is characterized by being formed in the shape of a tsupa whose diameter increases toward the end.

【0007】【0007】

【実施例】 以下、図面により本発明の実施例に
ついて説明する。
[Examples] Examples of the present invention will be described below with reference to the drawings.

【0008】 先ず図1において、ブレーキ用マスタ
シリンダに用いられるAl合金製のシリンダ体1
は、中心部に袋状のシリンダ孔2を有しており、
また同シリンダ体1のシリンダ孔2開放側端部外
周には取付フランジ3が一体に形成されている。
[0008] First, in FIG. 1, a cylinder body 1 made of Al alloy used in a brake master cylinder is shown.
has a bag-shaped cylinder hole 2 in the center,
Further, a mounting flange 3 is integrally formed on the outer periphery of the open end of the cylinder hole 2 of the cylinder body 1.

【0009】 更にシリンダ体1の側壁には、その外
面に凹部4を形成することにより薄肉部5が形成
され、この薄肉部5に小孔としてのリリーフポー
ト6が穿設され、該ポート6を介してシリンダ孔
2と外部のオイルリザーバ(図示せず)との間を
作動油が流通し得るようになつている。上記リリ
ーフポート6のシリンダ孔2側開口縁7は、図2
に明示するように横断面弧状に形成される。
[0009] Furthermore, a thin wall portion 5 is formed in the side wall of the cylinder body 1 by forming a recess 4 on the outer surface thereof, and a relief port 6 as a small hole is bored in this thin wall portion 5, and the port 6 is opened. Hydraulic oil can flow between the cylinder bore 2 and an external oil reservoir (not shown) through the cylinder hole 2 . The opening edge 7 of the relief port 6 on the cylinder hole 2 side is shown in FIG.
The cross section is formed into an arc shape as shown in the figure.

【0010】 前記シリンダ孔2には、外周にシール
部材9を装着したピストン8が摺動自在に嵌装さ
れる。
[0010] A piston 8 having a seal member 9 attached to its outer periphery is slidably fitted into the cylinder hole 2.

【0011】 次にリリーフポート6及びその開口縁
7の形成方法を図3を参酌して説明する。この方
法の実施に使用するポンチ10は、例えば図4に
示す如く比較的大径のシヤンク部11と、先端部
としての穿孔針部12との間が漏斗状頚部13に
より一体に接続されている。斯かるポンチ10を
シリンダ体1の前記薄肉部5に対しシリンダ孔2
内部から外方へ向けて打込むと、先ずポンチ10
の先端部としての穿孔針部12によりリリーフポ
ート6が穿たれる。次いで、同ポンチ10の漏斗
状頚部13がリリーフポート6のシリンダ孔2側
の開口縁7に押圧するため、該開口縁7はポンチ
10の打込みにつれて該ポート6の中心側へだれ
落ち、その結果、前述のような横断面弧状の形状
を呈することになる。
[0011] Next, a method for forming the relief port 6 and its opening edge 7 will be described with reference to FIG. A punch 10 used to carry out this method has a relatively large-diameter shank portion 11 and a piercing needle portion 12 as a tip portion, which are integrally connected by a funnel-shaped neck portion 13, as shown in FIG. 4, for example. . The punch 10 is inserted into the cylinder hole 2 against the thin wall portion 5 of the cylinder body 1.
When you drive from the inside to the outside, first punch 10
The relief port 6 is bored by the piercing needle part 12 as the tip of the hole. Next, the funnel-shaped neck 13 of the punch 10 presses against the opening edge 7 of the relief port 6 on the cylinder hole 2 side, so that the opening edge 7 drips down toward the center of the port 6 as the punch 10 is driven. , the cross section will have an arcuate shape as described above.

【0012】 而して、上記のようにリリーフポート
6のシリンダ孔2側の開口縁7が横断面弧状に形
成されると、ピストン8の往復動に伴いシール部
材9がリリーフポート6の開口部を横切るとき、
その開口縁7を滑らかに滑ることができるので、
損傷することはない。
[0012] Therefore, when the opening edge 7 of the relief port 6 on the cylinder hole 2 side is formed to have an arc shape in cross section as described above, the seal member 9 closes the opening of the relief port 6 as the piston 8 reciprocates. when crossing the
Since you can slide smoothly on the opening edge 7,
No damage will occur.

【0013】【0013】

【発明の効果】 以上のように本発明によれば、
シール部材を介してピストンが摺動自在に嵌合す
るシリンダ孔を有するシリンダ体に、そのシリン
ダ孔の内周面に開口する小孔を形成するようにし
た、シリンダ体への小孔形成方法において、シリ
ンダ体の側壁外面に設けた凹部に対応して該側壁
に予め形成される薄肉部に、シリンダ孔内部から
ポンチを打ち込んで該ポンチの先端部により前記
小孔を穿ち、次いで同ポンチの先端部に連なる漏
斗状頚部を前記小孔のシリンダ孔側の開口縁に押
圧して該開口縁を、シリンダ孔に向つて拡径する
ラツパ状に形成するようにしたので、ポンチのシ
リンダ孔内部からの単なる打ち込みによつて、小
孔の穿設と、該孔開口縁のラツパ状拡径とを一挙
に行うことができ、作業能率の向上に大いに寄与
することができる。しかもシリンダ孔をピストン
が摺動する時に、そのシール部材が前記開口縁の
ラツパ状拡径部を滑らかに滑ることにより、シー
ル部材の延命が図られる。
[Effects of the Invention] As described above, according to the present invention,
In a method for forming a small hole in a cylinder body, the small hole opening in the inner peripheral surface of the cylinder hole is formed in the cylinder body having a cylinder hole into which a piston is slidably fitted via a sealing member. , a punch is driven from inside the cylinder hole into a thin wall portion previously formed on the side wall corresponding to the recess provided on the outer surface of the side wall of the cylinder body, and the small hole is bored with the tip of the punch; The funnel-shaped neck connected to the cylinder hole is pressed against the opening edge of the small hole on the cylinder hole side, and the opening edge is formed into a flap shape that expands in diameter toward the cylinder hole. By simply driving the hole, it is possible to make a small hole and expand the diameter of the opening edge of the hole in a concave manner, which greatly contributes to improving work efficiency. Moreover, when the piston slides in the cylinder hole, the seal member smoothly slides on the flared diameter portion of the opening edge, thereby extending the life of the seal member.

【0014】 また特に小孔の穿設は、シリンダ体の
側壁外面に設けた凹部に対応して形成される該側
壁の薄肉部に対して行われるため、前記ポンチに
よる打ち込みによつても小孔穿設作業を難なく且
つ精度良く行うことができ、従つて作業能率の向
上に一層寄与し得ると共にポンチの延命を図るこ
とができる。
[0014] In addition, since the small hole is formed in a thin part of the side wall that is formed in correspondence with the recess provided on the outer surface of the side wall of the cylinder body, the small hole can also be formed by driving with the punch. The drilling work can be carried out easily and with high precision, which can further contribute to improving work efficiency and extend the life of the punch.

【図面の簡単な説明】[Brief explanation of drawings]

【図1】 本発明方法により得られたシリンダ体
の一実施例を示す縦断側面図
[Fig. 1] A vertical side view showing an example of a cylinder body obtained by the method of the present invention.

【図2】 図1の2矢視部拡大図[Figure 2] Enlarged view of the 2nd arrow view in Figure 1

【図3】 リリーフポート及びその開口縁の形成
方法の行程説明図
[Figure 3] Process explanatory diagram of the method for forming the relief port and its opening edge

【図4】 上記形成方法の実施に用いるポンチの
側面図
[Figure 4] Side view of the punch used to carry out the above forming method

【符号の説明】[Explanation of symbols]

1 シリンダ体 2 シリンダ孔 4 凹部 5 薄肉部 6 小孔としてのリリーフポート 7 開口縁 8 ピストン 9 シール部材 10 ポンチ 12 先端部としての穿孔針部 13 漏斗状頚部 1 Cylinder body 2 Cylinder hole 4 Recess 5 Thin wall part 6 Relief port as a small hole 7 Opening edge 8 Piston 9 Seal member 10 punch 12 Punching needle part as tip part 13 Funnel neck

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 シール部材9を介してピストン8
が摺動自在に嵌合するシリンダ孔2を有するシリ
ンダ体1に、そのシリンダ孔2の内周面に開口す
る小孔6を形成するようにした、シリンダ体への
小孔形成方法において、前記シリンダ体1の側壁
外面に設けた凹部4に対応して該側壁に予め形成
される薄肉部5に、シリンダ孔2内部からポンチ
10を打ち込んで該ポンチ10の先端部12によ
り前記小孔6を穿ち、次いで同ポンチ10の先端
部12に連なる漏斗状頚部13を前記小孔6のシ
リンダ孔2側の開口縁7に押圧して該開口縁7
を、シリンダ孔2に向つて拡径するラツパ状に形
成することを特徴とする、シリンダ体への小孔形
成方法。
Claim 1: Piston 8 via seal member 9
In the method for forming a small hole in a cylinder body, the small hole 6 opening in the inner peripheral surface of the cylinder hole 2 is formed in the cylinder body 1 having a cylinder hole 2 into which the cylinder hole 2 is slidably fitted. A punch 10 is driven from inside the cylinder hole 2 into a thin wall portion 5 formed in advance on the side wall corresponding to the recess 4 provided on the outer surface of the side wall of the cylinder body 1, and the small hole 6 is punched with the tip 12 of the punch 10. The funnel-shaped neck 13 connected to the tip 12 of the punch 10 is pressed against the opening edge 7 of the small hole 6 on the cylinder hole 2 side.
A method for forming a small hole in a cylinder body, the method comprising: forming a small hole in a cylinder body in the form of a bumper whose diameter increases toward the cylinder hole 2.
JP33726791A 1991-12-19 1991-12-19 Method for forming small hole in cylindrical body Granted JPH0516100A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33726791A JPH0516100A (en) 1991-12-19 1991-12-19 Method for forming small hole in cylindrical body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33726791A JPH0516100A (en) 1991-12-19 1991-12-19 Method for forming small hole in cylindrical body

Publications (2)

Publication Number Publication Date
JPH0516100A JPH0516100A (en) 1993-01-26
JPH0558874B2 true JPH0558874B2 (en) 1993-08-27

Family

ID=18307008

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33726791A Granted JPH0516100A (en) 1991-12-19 1991-12-19 Method for forming small hole in cylindrical body

Country Status (1)

Country Link
JP (1) JPH0516100A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5171735B2 (en) * 2009-06-04 2013-03-27 日信工業株式会社 Cylinder body and cylinder body manufacturing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193490A (en) * 1975-02-14 1976-08-16
JPS599967U (en) * 1982-07-12 1984-01-21 南 チヅ子 Foldable shopping car

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193490A (en) * 1975-02-14 1976-08-16
JPS599967U (en) * 1982-07-12 1984-01-21 南 チヅ子 Foldable shopping car

Also Published As

Publication number Publication date
JPH0516100A (en) 1993-01-26

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