JP2000140974A - Cylindrical member having seal groove - Google Patents

Cylindrical member having seal groove

Info

Publication number
JP2000140974A
JP2000140974A JP10317263A JP31726398A JP2000140974A JP 2000140974 A JP2000140974 A JP 2000140974A JP 10317263 A JP10317263 A JP 10317263A JP 31726398 A JP31726398 A JP 31726398A JP 2000140974 A JP2000140974 A JP 2000140974A
Authority
JP
Japan
Prior art keywords
groove
seal groove
cylindrical portion
seal
cylindrical
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
Application number
JP10317263A
Other languages
Japanese (ja)
Inventor
Tomonori Kakihara
智紀 垣原
Naochika Mitsuoka
直躬 三岡
Kiyoshi Sawada
潔 澤田
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.)
Hosei Brake Industry Co Ltd
Original Assignee
Hosei Brake Industry 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 Hosei Brake Industry Co Ltd filed Critical Hosei Brake Industry Co Ltd
Priority to JP10317263A priority Critical patent/JP2000140974A/en
Publication of JP2000140974A publication Critical patent/JP2000140974A/en
Pending legal-status Critical Current

Links

Landscapes

  • Pistons, Piston Rings, And Cylinders (AREA)
  • Braking Arrangements (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce a weight and a material cost by thinning the thickness of a cylindrical part to be provided with a seal groove. SOLUTION: A seal groove 14 is formed by pressing a forming die to the outer peripheral face of a cylinder part 12 subjecting to cold form rolling. By this method, a thickness of the cylinder part is thinned as compared to forming with cutting so as to reduce a weight and a material cost. Further, a cross section of a groove bottom of the seal groove 14 is a smooth circular arc shape being shallower more to both sides, the cylinder part 12 is easily plastic- deformed by copying a formed face of a forming die as compared to a seal groove of flat and square, the seal groove 14 having a target shape is formed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はシール溝を有する円
筒状部材に係り、特に、シール溝の形状に関するもので
ある。
The present invention relates to a cylindrical member having a seal groove, and more particularly to a shape of the seal groove.

【0002】[0002]

【従来の技術】金属材料製の円筒部を有するとともに、
その円筒部の外周面に環状のシール溝が形成されている
円筒状部材が、各種の技術分野で広く使用されている。
例えばディスクブレーキのピストンはその一例で、シー
ル溝にはOリング等のシール部材が配設されて外周側に
嵌合されるシリンダ部材等との間がシールされるように
なっている。シール溝は一般に横断面が四角形状で、切
削加工によって形成されている。
2. Description of the Related Art While having a cylindrical portion made of a metal material,
Cylindrical members having an annular seal groove formed on the outer peripheral surface of the cylindrical portion are widely used in various technical fields.
For example, a piston of a disc brake is one example, and a seal member such as an O-ring is provided in a seal groove so as to seal between a cylinder member and the like fitted on the outer peripheral side. The seal groove generally has a rectangular cross section and is formed by cutting.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、切削加
工でシール溝を加工する場合、強度を確保する上で円筒
部の肉厚を厚くする必要があるため、シール溝以外の部
分では必要以上に肉厚が厚くなり、材料コストが高くな
るとともに重量が重くなるという問題があった。
However, when a seal groove is machined by cutting, it is necessary to increase the thickness of the cylindrical portion in order to secure strength. There is a problem that the thickness is increased, the material cost is increased, and the weight is increased.

【0004】本発明は以上の事情を背景として為された
もので、その目的とするところは、シール溝が設けられ
る円筒部の肉厚を薄くして重量および材料コストを低減
することにある。
The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the weight and material cost by reducing the thickness of a cylindrical portion provided with a seal groove.

【0005】[0005]

【課題を解決するための手段】かかる目的を達成するた
めに、第1発明は、金属材料製の円筒部を有するととも
に、その円筒部の外周面にはシール部材が配設される環
状のシール溝が形成されている円筒状部材であって、
(a) 前記シール溝は、前記円筒部の外周面に成形ダイス
が押圧されることによりその円筒部が局部的に内周側へ
塑性変形させられることによって形成されたもので、
(b) そのシール溝の溝底の断面形状は、両側程浅くなる
滑らかな円弧形状を成していることを特徴とする。
In order to achieve the above object, a first aspect of the present invention is to provide an annular seal having a cylindrical portion made of a metal material and having a sealing member provided on an outer peripheral surface of the cylindrical portion. A cylindrical member having a groove formed therein,
(a) The seal groove is formed by pressing the forming die against the outer peripheral surface of the cylindrical portion so that the cylindrical portion is locally plastically deformed to the inner peripheral side,
(b) The cross-sectional shape of the groove bottom of the seal groove has a smooth arc shape that becomes shallower on both sides.

【0006】第2発明は、第1発明のシール溝を有する
円筒状部材において、前記シール溝の溝底の断面形状に
おける円弧の曲率半径R1は溝幅Wの60%〜120%
の範囲内で、最大溝深さdはその溝幅Wの50%以下で
あることを特徴とする。
According to a second aspect of the present invention, in the cylindrical member having the seal groove of the first aspect, the radius of curvature R1 of the circular arc in the cross-sectional shape of the groove bottom of the seal groove is 60% to 120% of the groove width W.
, The maximum groove depth d is not more than 50% of the groove width W.

【0007】[0007]

【発明の効果】本発明によれば、円筒部の外周面に成形
ダイスを押圧することによってシール溝が形成されてい
るため、切削加工で形成する場合に比較して円筒部の肉
厚を薄くすることが可能であり、重量および材料コスト
が低減される。また、シール溝の溝底の断面形状は、両
側程浅くなる滑らかな円弧形状を成しているため、溝底
が平坦な四角形のシール溝に比較して円筒部が成形ダイ
スに倣って塑性変形し易く、目的通りの断面形状のシー
ル溝を形成できる。
According to the present invention, since the seal groove is formed by pressing the forming die on the outer peripheral surface of the cylindrical portion, the thickness of the cylindrical portion is made thinner than that formed by cutting. And weight and material costs are reduced. In addition, since the cross-sectional shape of the groove bottom of the seal groove has a smooth arc shape that becomes shallower on both sides, the cylindrical portion plastically deforms following the forming die compared to a square seal groove with a flat groove bottom. Therefore, a seal groove having a desired cross-sectional shape can be formed.

【0008】特に、第2発明ではシール溝の溝底の断面
形状における円弧の曲率半径R1が溝幅Wの60%〜1
20%の範囲内で、最大溝深さdがその溝幅Wの50%
以下であるため、例えば図3の(a) に示すようにシール
溝の両側Aで肉が盛り上がったり、図3の(b) に示すよ
うにシール溝の両側Bが内側へ引っ張られてダレたりす
ることが抑制され、成形ダイスに対応する所望通りのシ
ール溝を一層精度良く形成できる。
In particular, in the second invention, the radius of curvature R1 of the circular arc in the cross-sectional shape of the groove bottom of the seal groove is 60% to 1% of the groove width W.
Within the range of 20%, the maximum groove depth d is 50% of the groove width W.
For example, as shown in FIG. 3A, the flesh swells on both sides A of the seal groove, and both sides B of the seal groove are pulled inward as shown in FIG. Is suppressed, and a desired sealing groove corresponding to the forming die can be formed with higher accuracy.

【0009】[0009]

【発明の実施の形態】本発明は、ディスクブレーキ等の
ピストンなど、金属材料製の円筒部を有するとともに、
その円筒部の外周面には環状のシール溝が形成されてい
る種々の円筒状部材に適用される。円筒状部材は、少な
くとも円筒部を備えておれば良く、両端が開口している
ものでも、一端が閉塞された有底円筒形状のものでも、
両端が閉塞された中空体でも良い。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has a cylindrical portion made of a metal material such as a piston for a disc brake or the like.
The present invention is applied to various cylindrical members having an annular seal groove formed on the outer peripheral surface of the cylindrical portion. The cylindrical member may have at least a cylindrical portion, and may be open at both ends, or may be a bottomed cylindrical shape having one end closed.
A hollow body having both ends closed may be used.

【0010】第2発明のように、シール溝の溝底の断面
形状における円弧の曲率半径R1は溝幅Wの60%〜1
20%の範囲内で、最大溝深さdはその溝幅Wの50%
以下であることが望ましいが、更に好ましくは、溝底の
断面形状における円弧の曲率半径R1は溝幅Wの80%
〜100%の範囲内で、最大溝深さdは溝幅Wの30%
以下が良い。なお、シール溝の溝底の断面形状における
円弧の曲率半径R1が溝幅Wの60%、或いは80%よ
り小さいと、成形ダイスが食込み易くなるが図3の(a)
のような盛り上がりが生じ易くなり、溝幅Wの120
%、或いは100%より大きいと、溝底が平坦になって
変形抵抗が大きくなり、図3の(b) のようなダレが生じ
易くなる。シール溝の最大溝深さdが溝幅Wの50%或
いは30%より大きいと、円筒部の肉厚tとの関係で図
3の(b) のようなダレが生じ易くなる。
As in the second invention, the radius of curvature R1 of the circular arc in the sectional shape of the groove bottom of the seal groove is 60% to 1% of the groove width W.
Within the range of 20%, the maximum groove depth d is 50% of the groove width W.
Preferably, the radius of curvature R1 of the circular arc in the cross-sectional shape of the groove bottom is 80% of the groove width W.
Within the range of ~ 100%, the maximum groove depth d is 30% of the groove width W
The following is good. When the radius of curvature R1 of the circular arc in the cross-sectional shape of the groove bottom of the seal groove is smaller than 60% or 80% of the groove width W, the forming die becomes easy to bite, but FIG.
Swelling easily occurs, and the groove width W of 120
% Or more than 100%, the groove bottom becomes flat and the deformation resistance increases, so that the sag as shown in FIG. If the maximum groove depth d of the seal groove is larger than 50% or 30% of the groove width W, sagging as shown in FIG. 3B is likely to occur in relation to the thickness t of the cylindrical portion.

【0011】円筒部の肉厚tは製品の種類に応じて適宜
設定されるが、本発明を適用する上では1mm〜10m
m程度、更に好ましくは2mm〜5mm程度が良い。溝
幅Wや最大溝深さdは、シール部材の大きさを考慮して
適宜設定される。円筒部を構成している金属材料として
は、例えば低炭素鋼などが好適に用いられる。
Although the thickness t of the cylindrical portion is appropriately set according to the type of the product, it is 1 mm to 10 m in applying the present invention.
m, more preferably about 2 mm to 5 mm. The groove width W and the maximum groove depth d are appropriately set in consideration of the size of the seal member. As the metal material forming the cylindrical portion, for example, low carbon steel or the like is suitably used.

【0012】以下、本発明の実施例を図面を参照しつつ
詳細に説明する。図1の(a) は、ディスクブレーキ用の
ピストン10を示す断面図で、有底円筒形状を成してい
るとともに、円筒部12の開口側の外周面には図1の
(b) に拡大して示すように環状のシール溝14が設けら
れ、Oリング等のシール部材が配設されるようになって
いる。ピストン10は、本発明の一実施例である円筒状
部材に相当するもので、金属材料(具体的には低炭素
鋼)にて構成されており、板状の金属素材に絞り加工を
施すことによって有底円筒形状に成形されている。ま
た、シール溝14は、図2に示すように有底円筒形状の
中間製品16を、シール溝14に対応する凸形状の成形
面18が形成された円柱形状の成形ダイス20に押圧し
つつ、中心線Oまわりに回転させて冷間転造加工を施す
ことにより、円筒部12の一部を局部的に内周側へ塑性
変形させたものである。本実施例では、成形後の内周面
に対応する凹形状の成形面22が形成された円柱形状の
当て金24を円筒部12の内周面に押し当てて転造加工
を行うようになっており、成形ダイス20および当て金
24は、それぞれ中心線S1 、S2 まわりに回転可能に
配設され、且つ相対的に接近させられて円筒部12に押
圧されるようになっている。なお、このシール溝14の
成形加工時に、シール溝14よりも先端側(開口部側)
の部分は、径寸法がφ43.13mm程度からφ42.
43mm程度へ僅かに縮径されるが、これは次工程の外
径研磨加工で砥石が当たらないようにするためであり、
これによりディスクブレーキパッドが当たる先端面15
の肉厚が確保される。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a cross-sectional view showing a piston 10 for a disc brake, which has a cylindrical shape with a bottom and has an outer peripheral surface on the opening side of the cylindrical portion 12 as shown in FIG.
An annular seal groove 14 is provided as shown in an enlarged manner in (b), and a seal member such as an O-ring is provided. The piston 10 corresponds to a cylindrical member according to an embodiment of the present invention, and is made of a metal material (specifically, low carbon steel). To form a cylindrical shape with a bottom. The sealing groove 14 presses the intermediate product 16 having a bottomed cylindrical shape against a cylindrical forming die 20 having a convex forming surface 18 corresponding to the sealing groove 14 as shown in FIG. A part of the cylindrical portion 12 is locally plastically deformed to the inner peripheral side by performing cold rolling while rotating around the center line O. In the present embodiment, the rolling process is performed by pressing a cylindrical contact metal 24 having a concave molding surface 22 corresponding to the molded inner peripheral surface against the inner peripheral surface of the cylindrical portion 12. The forming die 20 and the backing plate 24 are rotatably disposed around the center lines S 1 and S 2 , respectively, and are relatively close to each other and pressed against the cylindrical portion 12. When forming the seal groove 14, the tip side (opening side) of the seal groove 14
Part has a diameter of about φ43.13 mm to φ42.
The diameter is slightly reduced to about 43 mm, but this is to prevent the grinding stone from hitting in the outer diameter polishing process in the next step,
As a result, the distal end surface 15 against which the disc brake pad hits
Thickness is secured.

【0013】上記シール溝14は、図1(b) の拡大図か
ら明らかなように溝底の断面形状が両側程浅くなる滑ら
かな円弧形状を成しており、シール溝14の溝底の断面
形状における円弧の曲率半径R1は溝幅Wの80%〜1
00%の範囲内で、最大溝深さdは溝幅Wの30%以下
である。具体的には、溝幅W≒4.7mm、曲率半径R
1≒4mm、最大溝深さd≒1.3mmである。また、
シール溝14の幅方向の両端には、曲率半径R1より十
分に小さい曲率半径R2の内角部が、曲率半径R1の溝
底部に連続して滑らかに設けられているとともに、その
内角部には、曲率半径R2よりも更に小さい曲率半径R
3の外角部が滑らかに連続して設けられ、円筒部12の
外周面に滑らかに接続されている。本実施例では曲率半
径R2≒0.6mmで、曲率半径R3≒0.3mmであ
る。なお、肉厚tは約2.6mmである。
As is clear from the enlarged view of FIG. 1B, the seal groove 14 has a smooth circular arc shape in which the cross-sectional shape of the groove bottom is shallower on both sides. The radius of curvature R1 of the circular arc in the shape is 80% to 1 of the groove width W.
Within the range of 00%, the maximum groove depth d is 30% or less of the groove width W. Specifically, groove width W ≒ 4.7 mm, radius of curvature R
1 ≒ 4 mm and maximum groove depth d ≒ 1.3 mm. Also,
At both ends in the width direction of the seal groove 14, an inner corner having a radius of curvature R2 sufficiently smaller than the radius of curvature R1 is smoothly provided continuously to the groove bottom having the radius of curvature R1. Radius of curvature R smaller than radius of curvature R2
The outer corners 3 are smoothly and continuously provided, and are smoothly connected to the outer peripheral surface of the cylindrical portion 12. In this embodiment, the radius of curvature R2 ≒ 0.6 mm and the radius of curvature R3 ≒ 0.3 mm. The thickness t is about 2.6 mm.

【0014】このようなピストン10によれば、円筒部
12の外周面に成形ダイス20を押圧して冷間転造加工
を施すことによりシール溝14が形成されているため、
切削加工で形成する場合に比較して円筒部12の肉厚を
薄くすることが可能であり、重量および材料コストが低
減される。また、シール溝14の溝底の断面形状は、両
側程浅くなる滑らかな円弧形状を成しているため、溝底
が平坦な四角形のシール溝に比較して円筒部12が成形
ダイス20の成形面18に倣って塑性変形し易く、目的
通りの断面形状のシール溝14を形成できる。
According to such a piston 10, the sealing groove 14 is formed by pressing the forming die 20 on the outer peripheral surface of the cylindrical portion 12 and performing cold rolling.
The thickness of the cylindrical portion 12 can be reduced as compared with the case of forming by cutting, and the weight and material cost can be reduced. Further, since the cross-sectional shape of the groove bottom of the seal groove 14 has a smooth arc shape that becomes shallower on both sides, the cylindrical portion 12 is formed with the forming die 20 in comparison with a square seal groove having a flat groove bottom. The seal groove 14 is easily deformed plastically following the surface 18 and has a desired cross-sectional shape.

【0015】特に、シール溝14の溝底の断面形状にお
ける円弧の曲率半径R1が溝幅Wの80%〜100%の
範囲内で、最大溝深さdがその溝幅Wの30%以下であ
るため、例えば図3の(a) に示すようにシール溝の両側
Aで肉が盛り上がったり、図3の(b) に示すようにシー
ル溝の両側Bが内側へ引っ張られてダレたりすることが
抑制され、成形ダイス20に対応する所望通りのシール
溝14を一層高い精度で形成できる。なお、図3(a) の
ように盛り上がると、シリンダ部材に嵌合できなくなる
ため切削加工などで除去する必要があり、(b) のように
ダレるとシール部材が外れ易くなる。
In particular, when the radius of curvature R1 of the circular arc in the sectional shape of the groove bottom of the seal groove 14 is within the range of 80% to 100% of the groove width W, and the maximum groove depth d is 30% or less of the groove width W, Therefore, for example, as shown in FIG. 3 (a), the meat may rise on both sides A of the seal groove, or as shown in FIG. 3 (b), both sides B of the seal groove may be pulled inward and sagged. Is suppressed, and the desired seal groove 14 corresponding to the molding die 20 can be formed with higher accuracy. If the bulge is formed as shown in FIG. 3 (a), it cannot be fitted to the cylinder member and must be removed by cutting or the like, and if it is sagged as shown in FIG. 3 (b), the seal member tends to come off.

【0016】また、本実施例ではシール溝14の幅方向
の両端に、曲率半径R1より十分に小さい曲率半径R2
で内角部が設けられているとともに、その内角部には、
曲率半径R2よりも更に小さい曲率半径R3の外角部が
滑らかに連続して設けられ、円筒部12の外周面に滑ら
かに接続されているため、成形ダイス20によるシール
溝14の成形精度が更に向上するとともに、内角部の存
在によりシール部材の離脱が良好に防止される。
In this embodiment, the radius of curvature R2, which is sufficiently smaller than the radius of curvature R1, is provided at both ends of the seal groove 14 in the width direction.
The inside corner is provided at the inside corner,
Since the outer corners of the radius of curvature R3 smaller than the radius of curvature R2 are smoothly and continuously provided and are smoothly connected to the outer peripheral surface of the cylindrical portion 12, the molding accuracy of the seal groove 14 by the molding die 20 is further improved. At the same time, the presence of the inner corner prevents the detachment of the seal member satisfactorily.

【0017】以上、本発明の実施例を図面に基づいて詳
細に説明したが、本発明は他の態様で実施することもで
きる。
Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be embodied in other forms.

【0018】例えば、前記実施例のシール溝14は内角
部から外角部に直接接続されていたが、それ等の間に中
心線Oに対して略垂直な平坦面にて構成される側壁部を
設けることもできる。
For example, although the seal groove 14 of the above embodiment is directly connected from the inner corner to the outer corner, a side wall composed of a flat surface substantially perpendicular to the center line O is provided between them. It can also be provided.

【0019】また、前記実施例では当て金24に成形面
22が設けられていたが、単に円筒部12の局部的な内
周側への膨出を許容する凹所を設けるだけでも良い。但
し、このような当て金24は必ずしも本発明に必須のも
のではない。また、成形ダイス20についても、必ずし
も円柱形状である必要はなく、平ダイスを用いることも
可能である。
In the above-described embodiment, the molding surface 22 is provided on the backing plate 24. However, it is also possible to simply provide a concave portion that allows the cylindrical portion 12 to protrude locally to the inner peripheral side. However, such a support 24 is not necessarily essential to the present invention. Also, the forming die 20 does not necessarily have to be cylindrical, and a flat die can be used.

【0020】その他一々例示はしないが、本発明は当業
者の知識に基づいて種々の変更,改良を加えた態様で実
施することができる。
Although not specifically exemplified, the present invention can be implemented in various modified and improved embodiments based on the knowledge of those skilled in the art.

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

【図1】本発明の一実施例であるディスクブレーキ用の
ピストンを示す図で、(a) は中心線Oを含む断面図、
(b) はシール溝近傍の拡大断面図である。
FIG. 1 is a diagram showing a piston for a disc brake according to an embodiment of the present invention, wherein (a) is a cross-sectional view including a center line O,
(b) is an enlarged sectional view near the seal groove.

【図2】図1のピストンの円筒部にシール溝を転造加工
する際の加工工程を説明する図である。
FIG. 2 is a view for explaining a processing step when rolling a seal groove in a cylindrical portion of the piston of FIG. 1;

【図3】円筒部にシール溝を転造加工する場合の不良品
例を説明する図である。
FIG. 3 is a diagram illustrating an example of a defective product when a seal groove is rolled in a cylindrical portion.

【符号の説明】[Explanation of symbols]

10:ピストン(円筒状部材) 12:円筒部 14:シール溝 20:成形ダイス 10: Piston (cylindrical member) 12: Cylindrical part 14: Seal groove 20: Molding die

───────────────────────────────────────────────────── フロントページの続き (72)発明者 澤田 潔 愛知県豊田市和会町道上10番地 豊生ブレ ーキ工業株式会社内 Fターム(参考) 3J044 AA20 BA01 BC01 CA06 EA03 3J058 AA41 AA77 BA63 BA68 CC02 CC35 FA01  ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kiyoshi Sawada 10th Michigami, Wakaai-cho, Toyota-shi, Aichi Prefecture F-term (in reference) 3J044 AA20 BA01 BC01 CA06 EA03 3J058 AA41 AA77 BA63 BA68 CC02 CC35 FA01

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 金属材料製の円筒部を有するとともに、
該円筒部の外周面にはシール部材が配設される環状のシ
ール溝が形成されている円筒状部材であって、 前記シール溝は、前記円筒部の外周面に成形ダイスが押
圧されることにより該円筒部が局部的に内周側へ塑性変
形させられることによって形成されたもので、該シール
溝の溝底の断面形状は、両側程浅くなる滑らかな円弧形
状を成していることを特徴とするシール溝を有する円筒
状部材。
1. It has a cylindrical portion made of a metal material,
A cylindrical member in which an annular seal groove in which a sealing member is provided is formed on an outer peripheral surface of the cylindrical portion, wherein a molding die is pressed against the outer peripheral surface of the cylindrical portion; Is formed by locally plastically deforming the cylindrical portion toward the inner peripheral side, and the cross-sectional shape of the groove bottom of the seal groove has a smooth circular arc shape that becomes shallower on both sides. A cylindrical member having a characteristic sealing groove.
【請求項2】 前記シール溝の溝底の断面形状における
円弧の曲率半径R1は溝幅Wの60%〜120%の範囲
内で、最大溝深さdは該溝幅Wの50%以下であること
を特徴とする請求項1に記載のシール溝を有する円筒状
部材。
2. The radius of curvature R1 of the arc in the cross-sectional shape of the groove bottom of the seal groove is within a range of 60% to 120% of the groove width W, and the maximum groove depth d is 50% or less of the groove width W. The cylindrical member having a seal groove according to claim 1, wherein:
JP10317263A 1998-11-09 1998-11-09 Cylindrical member having seal groove Pending JP2000140974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10317263A JP2000140974A (en) 1998-11-09 1998-11-09 Cylindrical member having seal groove

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10317263A JP2000140974A (en) 1998-11-09 1998-11-09 Cylindrical member having seal groove

Publications (1)

Publication Number Publication Date
JP2000140974A true JP2000140974A (en) 2000-05-23

Family

ID=18086297

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10317263A Pending JP2000140974A (en) 1998-11-09 1998-11-09 Cylindrical member having seal groove

Country Status (1)

Country Link
JP (1) JP2000140974A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005335055A (en) * 2004-04-28 2005-12-08 Nissan Motor Co Ltd Apparatus and method for machining circular bore
JP2007024285A (en) * 2005-07-21 2007-02-01 Hosei Brake Ind Ltd Sealing structure
JP2008537067A (en) * 2005-04-04 2008-09-11 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Pressure medium accumulator, accumulator unit comprising a plurality of pressure medium accumulators, and method for manufacturing a pressure medium accumulator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005335055A (en) * 2004-04-28 2005-12-08 Nissan Motor Co Ltd Apparatus and method for machining circular bore
JP4697393B2 (en) * 2004-04-28 2011-06-08 日産自動車株式会社 Circular hole processing apparatus and processing method
JP2008537067A (en) * 2005-04-04 2008-09-11 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Pressure medium accumulator, accumulator unit comprising a plurality of pressure medium accumulators, and method for manufacturing a pressure medium accumulator
JP2007024285A (en) * 2005-07-21 2007-02-01 Hosei Brake Ind Ltd Sealing structure

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