JPS6136441Y2 - - Google Patents
Info
- Publication number
- JPS6136441Y2 JPS6136441Y2 JP1977015165U JP1516577U JPS6136441Y2 JP S6136441 Y2 JPS6136441 Y2 JP S6136441Y2 JP 1977015165 U JP1977015165 U JP 1977015165U JP 1516577 U JP1516577 U JP 1516577U JP S6136441 Y2 JPS6136441 Y2 JP S6136441Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder hole
- cylinder
- enlarged portion
- piston
- annular
- 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
Links
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Landscapes
- Transmission Of Braking Force In Braking Systems (AREA)
- Sealing Devices (AREA)
Description
【考案の詳細な説明】
本考案は、オートバイ等の油圧ブレーキ装置に
用いられるマスタシリンダにおいて、作動ピスト
ンの摺動部へ雨水、塵埃等が侵入するのを防止す
る防水、防塵装置、特に作動ピストンのピストン
ロツドを囲撓する可撓性ブーツの前端をシリンダ
孔に、またその後端をピストンロツド後端にそれ
ぞれ固定した形式の装置に関する。[Detailed description of the invention] The present invention is a waterproof and dustproof device that prevents rainwater, dust, etc. from entering the sliding part of the operating piston in a master cylinder used in a hydraulic brake system for motorcycles, etc. The present invention relates to a device in which the front end of a flexible boot surrounding a piston rod is fixed to a cylinder hole, and the rear end is fixed to a rear end of the piston rod.
上記形式の装置において、そのブーツ前端に一
体に形成した輪状膨大部を、それに対する特別な
位置決め用環状係止溝をシリンダ孔内面に設ける
ことなく該シリンダ孔に固定するために、例えば
実開昭51−129983号公報に示されるように、作動
ピストンに対するストツパ板と、シリンダ孔内面
に弾力的に圧接させたスプリングとにより該輪状
膨大部を前後より挟着するようにしたものが従来
公知であり、このものでは、
上記スプリングによつては、ブーツの輪状膨
大部自身を半径方向外方へ積極的に拡張させて
シリンダ孔内面に押付けるようなことはでき
ず、従つて該輪状膨大部の外周面とシリンダ孔
内面間のシール性が十分でない。 In the above type of device, in order to fix the annular enlarged portion integrally formed at the front end of the boot to the cylinder hole without providing a special annular locking groove for positioning it on the inner surface of the cylinder hole, for example, As shown in Japanese Patent No. 51-129983, there is a conventionally known device in which the annular enlarged portion is sandwiched from the front and back by a stopper plate for the operating piston and a spring elastically pressed against the inner surface of the cylinder hole. With this spring, it is not possible to actively expand the annular swelling part of the boot radially outward and press it against the inner surface of the cylinder hole. The sealing performance between the outer circumferential surface and the inner surface of the cylinder hole is insufficient.
上記スプリングはシリンダ孔内面の、溝のな
い部分に直接接しているので軸方向に滑り易
く、もしその滑りが発生すると該スプリングに
よつては上記ブーツの輪状膨大部をストツパ板
に衝合保持することができなくなつて、該輪状
膨大部前面とストツパ板後面間のシール性が低
下するおそれがある。 Since the spring is in direct contact with the non-grooved portion of the inner surface of the cylinder hole, it easily slips in the axial direction, and if slippage occurs, the spring holds the annular enlarged portion of the boot against the stopper plate. As a result, the sealing performance between the front surface of the annular bulge and the rear surface of the stopper plate may deteriorate.
上記ブーツの輪状膨大部とスプリングとが別
体であるからそれらをシリンダ孔に個別に組付
けなければならず、その組付作業の能率が悪
い。 Since the annular enlarged portion of the boot and the spring are separate bodies, they must be individually assembled into the cylinder hole, which is inefficient.
以上〜の欠点がある。 There are the following drawbacks.
本考案は上記に鑑み提案されたもので、ブーツ
前端の輪状膨大部を、それに対する特別な位置決
め用環状係止溝をシリンダ孔内面に設けることな
く該シリンダ孔に固定することができ、しかも従
来装置の前記欠点をすべて解消することのできる
構造簡単な、前記マスタシリンダにおける防水、
防塵装置を提供することを目的とし、その特徴
は、シリンダ孔に、作動ピストンのシリンダ孔か
らの離脱を阻止するストツパ板を固定し、前記作
動ピストンの後方に突出するピストンロツドを囲
繞する可撓性ブーツ前端に、拡張傾向をもつ弾性
環状部材を埋設し且つ外周面に糸状リブを隆起さ
せた輪状膨大部を一体に形成し、この輪状膨大部
の前面を前記ストツパ板に衝合させると共に、同
輪状膨大部の外周面を前記弾性環状部材の拡張力
を以て前記シリンダ孔内面の、溝のない部分に圧
接させて、それら輪状膨大部外周面とシリンダ孔
内面間をそれら間の軸方向相対移動を規制し得る
よう摩擦連結し、さらに前記ブーツの後端部を前
記ピストンロツドの後端に接続したことにある。 The present invention was proposed in view of the above, and it is possible to fix the annular enlarged portion at the front end of the boot to the cylinder hole without providing a special positioning annular locking groove on the inner surface of the cylinder hole. waterproofing in the master cylinder, which has a simple structure that can eliminate all the drawbacks of the device;
The object of the present invention is to provide a dust-proofing device, and its features are that a stopper plate is fixed to the cylinder hole to prevent the working piston from separating from the cylinder hole, and a flexible stopper plate is provided to surround the piston rod that projects rearward of the working piston. At the front end of the boot, an annular bulge in which an elastic annular member with a tendency to expand is buried and thread-like ribs are raised on the outer peripheral surface is integrally formed, and the front surface of the annular bulge is abutted against the stopper plate. The outer circumferential surface of the annular enlarged portion is pressed against the groove-free portion of the inner surface of the cylinder hole by the expansion force of the elastic annular member, and relative movement in the axial direction between the outer circumferential surface of the annular enlarged portion and the inner surface of the cylinder hole is caused. The piston rod has a rear end connected to the rear end of the piston rod.
以下、図面により本考案の実施例について説明
すると、第１図において１はシリンダ本体で、そ
の上端には油溜２が連設され、この油溜２と連通
するシリンダ孔３には後端にブレーキレバー等の
操作部材４が連設される作動ピストン５を摺動し
て、その前方に出力ポート７が開口する油圧室６
を画成し、出力ポート７は油圧ブレーキ等の油圧
シリンダに連通される。シリンダ孔３の内面に
は、作動ピストン５の該孔３からの離脱を阻止す
るためのストツパ板１４が嵌合され、さらにこの
ストツパ板１４をシリンダ孔３の段部に保持する
サークリツプ１５が係止される。而してこのマス
タシリンダは、作動ピストン５の前進時、油圧室
６に発生する油圧を出力ポート７から送出し、そ
の後退時、油溜２から油圧室６に作動油を補給す
るようになつており、以上は従来普通の構成であ
る。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 1, reference numeral 1 denotes a cylinder body, an oil reservoir 2 is connected to the upper end of the cylinder body, and a cylinder hole 3 communicating with the oil reservoir 2 has a rear end. A hydraulic chamber 6 in which an operating piston 5 to which an operating member 4 such as a brake lever is connected slides, and an output port 7 opens in front of the operating piston 5
The output port 7 is connected to a hydraulic cylinder such as a hydraulic brake. A stopper plate 14 is fitted into the inner surface of the cylinder hole 3 to prevent the actuating piston 5 from disengaging from the hole 3, and a circlip 15 is engaged to hold the stopper plate 14 at the stepped portion of the cylinder hole 3. be stopped. Thus, when the working piston 5 moves forward, this master cylinder sends out the hydraulic pressure generated in the hydraulic chamber 6 from the output port 7, and when the working piston 5 moves back, it supplies hydraulic oil from the oil reservoir 2 to the hydraulic chamber 6. The above is a conventional configuration.
作動ピストン５の後方へ突出するピストンロツ
ド５ａはこれを可撓性ブーツ８で囲繞し、このブ
ーツ８の前端には、拡張傾向をもつ弾性環状部材
９を埋設した輪状膨大部８ａが一体に形成してあ
り、これを、その前面が前記サークリツプ１５に
当接した状態で上記弾性環状部材９の拡張力を以
てシリンダ孔３内面の、環状係止溝のない平滑部
分に圧接させて、該輪状膨大部８ａ外周面とシリ
ンダ孔３内面間を、それら間の軸方向相対移動を
規制し得るよう摩擦連結する。またブーツ８の後
端に形成した輪状膨大部８ｂをピストンロツド５
ａの後端外周の環状溝１０に弾力的に係合する。
而して、ブーツ８は作動ピストン５の摺動部を外
部と遮断して雨水、塵埃の侵入を防止し、且つ作
動ピストン５の作動を妨げないように屈撓するこ
とができる。 The piston rod 5a that projects rearward of the working piston 5 is surrounded by a flexible boot 8, and the front end of the boot 8 is integrally formed with an annular enlarged portion 8a in which an elastic annular member 9 with a tendency to expand is embedded. With its front surface in contact with the circlip 15, the expanding force of the elastic annular member 9 is used to press it against the smooth portion of the inner surface of the cylinder hole 3, which has no annular locking groove. The outer peripheral surface 8a and the inner surface of the cylinder hole 3 are frictionally connected to each other so as to restrict relative movement in the axial direction therebetween. In addition, the annular enlarged portion 8b formed at the rear end of the boot 8 is connected to the piston rod 5.
It elastically engages with the annular groove 10 on the outer periphery of the rear end of a.
Thus, the boot 8 isolates the sliding portion of the actuating piston 5 from the outside to prevent rainwater and dust from entering, and can be bent so as not to interfere with the operation of the actuating piston 5.
前記弾性環状部材９には第２図に示すような１
個の切り口１１をもつリング体を、また第３図に
示すようなコイルばねを使用することができる。
またシリンダ孔３の内面に圧接される、ブーツ８
の前部輪状膨大部８ａ外周面には、そのシール効
果を高めるために、第４図に示すように糸状リブ
１２が一体に隆起形成されている。 The elastic annular member 9 has one as shown in FIG.
A ring body with individual cuts 11 or a coil spring as shown in FIG. 3 can be used.
The boot 8 is also pressed against the inner surface of the cylinder hole 3.
As shown in FIG. 4, thread-like ribs 12 are integrally formed on the outer circumferential surface of the front annular enlarged portion 8a in order to enhance the sealing effect.
尚、図中１３は作動ピストン５の戻しばねであ
る。 Note that 13 in the figure is a return spring for the operating piston 5.
以上のように本考案によれば、シリンダ孔３
に、作動ピストン５のシリンダ孔３からの離脱を
阻止するストツパ板１４を固定し、作動ピストン
５の後方に突出するピストンロツド５ａを囲繞す
る可撓性ブーツ８の前端に、拡張傾向をもつ弾性
環状部材９を埋設し且つ外周面に糸状リブ１２を
隆起させた輪状膨大部８ａを一体に形成し、この
輪状膨大部８ａの前面を前記ストツパ板１４に衝
合させると共に、同輪状膨大部８ａの外周面を前
記弾性環状部材９の拡張力を以て前記シリンダ孔
３内面の、溝のない部分に圧接させて、それら輪
状膨大部８ａ外周面とシリンダ孔３内面間をそれ
ら間の軸方向相対移動を規制し得るよう摩擦連結
したので、摩擦係数の比較的大きい輪状膨大部８
ａ外周面とシリンダ孔３内面との間に弾性環状部
材９の拡張力に基いて生じる強力な摩擦結合力に
よつて、シリンダ孔３内面に環状係止溝を特別に
設けずとも輪状膨大部８ａの軸方向滑動を確実に
阻止することができ、これにより該輪状膨大部８
ａ前面とストツパ板１４後面との衝合を常に確実
に保持できてそれら面間のシール性を向上させる
ことができ、従つて前記拡張力によつて輪状膨大
部８ａの外周面をシリンダ孔３内面に常時積極的
に密着させ得る効果や、その密着強度を特に前記
糸状リブ１２の部分で高め得る効果と相俟つて、
全体としてブーツ８前端とシリンダ孔３間のシー
ル性を著しく高めることができる。しかもシリン
ダ孔３の内面には前記環状係止溝が形成されない
ことから、それだけシリンダ孔３の加工が簡単に
なり、またブーツ８の組付に際したは、輪状膨大
部８ａを弾性環状部材９の拡張力に抗して収縮変
形させつつ前記ストツパ板１４に当たるまでシリ
ンダ孔３内を単に押動するだけで、ブーツ８前端
のシリンダ孔３に対する位置決め、固定が直ちに
完了するから、作業が頗る簡単であり、さらにそ
の作業中に輪状膨大部８ａや作動ピストン５のシ
ールリツプを前記環状係止溝の開口縁によつて傷
付けるおそれも全くない。 As described above, according to the present invention, the cylinder hole 3
A stopper plate 14 that prevents the actuating piston 5 from coming off the cylinder hole 3 is fixed thereto, and an elastic ring-shaped elastic boot 8 that has a tendency to expand is attached to the front end of the flexible boot 8 that surrounds the piston rod 5a that projects rearward of the actuating piston 5. An annular enlarged portion 8a in which the member 9 is buried and a filamentous rib 12 raised on the outer peripheral surface is integrally formed, and the front surface of this annular enlarged portion 8a abuts against the stopper plate 14, and the annular enlarged portion 8a is The outer peripheral surface is brought into pressure contact with the groove-free portion of the inner surface of the cylinder hole 3 by the expansion force of the elastic annular member 9, and relative movement in the axial direction between the outer peripheral surface of the annular enlarged portion 8a and the inner surface of the cylinder hole 3 is caused. Since the frictional connection is made so that the friction can be controlled, the ring-shaped enlarged portion 8 has a relatively large coefficient of friction.
Due to the strong frictional coupling force generated between the outer circumferential surface and the inner surface of the cylinder hole 3 based on the expansion force of the elastic annular member 9, the annular enlarged portion can be formed without a special annular locking groove on the inner surface of the cylinder hole 3. 8a can be reliably prevented from sliding in the axial direction.
The abutment between the front surface a and the rear surface of the stopper plate 14 can be always maintained reliably, and the sealing performance between these surfaces can be improved. Coupled with the effect of being able to maintain positive contact with the inner surface at all times and the effect of increasing the adhesion strength particularly at the filamentous ribs 12,
Overall, the sealing performance between the front end of the boot 8 and the cylinder hole 3 can be significantly improved. Moreover, since the annular locking groove is not formed on the inner surface of the cylinder hole 3, the processing of the cylinder hole 3 becomes easier. The positioning and fixing of the front end of the boot 8 to the cylinder hole 3 is completed immediately by simply pushing it inside the cylinder hole 3 while contracting and deforming it against the expansion force until it hits the stopper plate 14, so the work is extremely simple. Furthermore, there is no risk of damaging the annular enlarged portion 8a or the seal lip of the actuating piston 5 by the opening edge of the annular locking groove during the operation.
第１図は本考案マスタシリンダの要部縦断側面
図、第２図は第１図におけるブーツの一実施例の
縦断面図、第３図はそれの別の実施例の縦断面
図、第４図は第３図のＡ部拡大図である。
１……シリンダ本体、３……シリンダ孔、５…
…作動ピストン、５Ａ……ピストンロツド、６…
…油圧室、７……出力ポート、８……可撓性ブー
ツ、８ａ……輪状膨大部、９……弾性環状部材、
１２……糸状リブ、１４……ストツパ板。
Fig. 1 is a longitudinal sectional side view of the main part of the master cylinder of the present invention, Fig. 2 is a longitudinal sectional view of one embodiment of the boot in Fig. 1, Fig. 3 is a longitudinal sectional view of another embodiment of the boot, and Fig. 4 is a longitudinal sectional view of the main part of the master cylinder of the present invention. The figure is an enlarged view of section A in FIG. 3. 1...Cylinder body, 3...Cylinder hole, 5...
...Operating piston, 5A... Piston rod, 6...
... Hydraulic chamber, 7 ... Output port, 8 ... Flexible boot, 8a ... Annular ampullae, 9 ... Elastic annular member,
12... thread-like rib, 14... stopper plate.
Claims (1)
５を摺合して、そのピストン５前方に、出力ポー
ト７が開口する油圧室６を画成したマスタシリン
ダにおいて、前記シリンダ孔３に前記作動ピスト
ン５のシリンダ孔３からの離脱を阻止するストツ
パ板１４を固定し、前記作動ピストン５の後方に
突出するピストンロッド５ａを囲繞する可撓性ブ
ーツ８の体端に、拡張傾向をもつ弾性環状部材９
を埋設し且つ外周面に糸状リブ１２を隆起させた
輪状膨大部８ａを一体に形成し、この輪状膨大部
８ａの前面を前記ストツパ板１４に衝合させると
共に、同輪状膨大部８ａの外周面を前記弾性環状
部材９の拡張力を以て前記シリンダ孔３の内面
の、溝のない部分に圧接させて、それら輪状膨大
部８ａ外周面とシリンダ孔３内面間をそれら間の
軸方向相対移動を規制し得るよう摩擦連結し、さ
らに前記ブーツ８の後端部を前記ピストンロツド
５ａの後端に接続してなる、マスタシリンダにお
ける防水、防塵装置。 In a master cylinder in which an operating piston 5 is slid into a cylinder hole 3 of a cylinder body 1 and a hydraulic chamber 6 is defined in front of the piston 5 with an output port 7 opened, the cylinder of the operating piston 5 is inserted into the cylinder hole 3. An elastic annular member 9 having a tendency to expand is attached to the body end of the flexible boot 8 which fixes the stopper plate 14 that prevents the stopper plate 14 from leaving the hole 3 and surrounds the piston rod 5a that projects rearward of the working piston 5.
An annular enlarged portion 8a is formed integrally with the thread-like ribs 12 embedded therein and raised on the outer circumferential surface, and the front surface of the annular enlarged portion 8a abuts against the stopper plate 14, and the outer circumferential surface of the annular enlarged portion 8a is is brought into pressure contact with the groove-free portion of the inner surface of the cylinder hole 3 by the expansion force of the elastic annular member 9, thereby restricting relative movement in the axial direction between the outer circumferential surface of the annular enlarged portion 8a and the inner surface of the cylinder hole 3. A waterproof and dustproof device for a master cylinder, which is frictionally connected to the piston rod 5a, and the rear end of the boot 8 is connected to the rear end of the piston rod 5a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977015165U JPS6136441Y2 (en) | 1977-02-10 | 1977-02-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977015165U JPS6136441Y2 (en) | 1977-02-10 | 1977-02-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53111187U JPS53111187U (en) | 1978-09-05 |
| JPS6136441Y2 true JPS6136441Y2 (en) | 1986-10-22 |
Family
ID=28836389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977015165U Expired JPS6136441Y2 (en) | 1977-02-10 | 1977-02-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6136441Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101015209B1 (en) | 2005-11-17 | 2011-02-18 | 주식회사 만도 | Proportioning valve for brake system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5123036Y2 (en) * | 1972-04-21 | 1976-06-14 |
-
1977
- 1977-02-10 JP JP1977015165U patent/JPS6136441Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53111187U (en) | 1978-09-05 |
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