JPH0733016Y2 - Pressure resistant oil seal for eccentric movement - Google Patents
Pressure resistant oil seal for eccentric movementInfo
- Publication number
- JPH0733016Y2 JPH0733016Y2 JP1990081404U JP8140490U JPH0733016Y2 JP H0733016 Y2 JPH0733016 Y2 JP H0733016Y2 JP 1990081404 U JP1990081404 U JP 1990081404U JP 8140490 U JP8140490 U JP 8140490U JP H0733016 Y2 JPH0733016 Y2 JP H0733016Y2
- Authority
- JP
- Japan
- Prior art keywords
- lip
- seal member
- shaft
- resistant oil
- pressure
- 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 - Lifetime
Links
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
Description
【考案の詳細な説明】 〈産業上の利用分野〉 この考案は、耐圧オイルシール、特に軸全体が偏心運動
する偏心動用の耐圧オイルシールに関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a pressure resistant oil seal, and more particularly to a pressure resistant oil seal for eccentric movement in which the entire shaft is eccentrically moved.
〈従来の技術〉 従来の耐圧オイルシールは、例えば第８図に示すよう
に、軸１に接触するリツプ２および３を有するリツプ部
４と、補強環５によつて補強された取付部６とからな
り、リツプ部４はスプリング７により軸１に圧接してい
る。取付部６は図示されないハウジングに固定されて、
ハウジング内部Ａの流体が外部Ｂへ流出するのを防止し
ている。<Prior Art> A conventional pressure-resistant oil seal is, for example, as shown in FIG. 8, a lip portion 4 having lips 2 and 3 contacting a shaft 1, and a mounting portion 6 reinforced by a reinforcing ring 5. The rip portion 4 is pressed against the shaft 1 by the spring 7. The mounting portion 6 is fixed to a housing (not shown),
The fluid inside the housing A is prevented from flowing out to the outside B.
〈考案が解決しようとする課題〉 このような構成の耐圧オイルシールは、ハウジング内部
Ａの流体が外部Ｂへ向かう圧力Ｃに十分対抗できるよう
に、リツプ部４の厚さが厚く、リツプ部４から取付部６
にかけての連結部８の構造も補強環５によつて堅固にな
つている。<Problems to be Solved by the Invention> In the pressure-resistant oil seal having such a configuration, the thickness of the rip portion 4 is large so that the fluid C inside the housing can sufficiently oppose the pressure C toward the outside B. To mounting part 6
The structure of the connecting portion 8 extending to the upper part is also solidified by the reinforcing ring 5.
このため、軸１が軸１全体の偏心運動によつて図におい
て大きく上下動すると、リツプ部４が厚いため軸１の偏
心動に十分に追従することができず、シール性が低下す
る問題点がある。また、リツプ部４が厚いため、偏心荷
重すなわち軸１の偏心動によりリツプ部４が受ける荷重
も大きくなるため、リツプの根元９に応力集中や繰り返
し応力が働き、耐久性に劣る問題点がある。Therefore, when the shaft 1 largely moves up and down in the figure due to the eccentric movement of the entire shaft 1, the rip portion 4 is thick, so that the eccentric movement of the shaft 1 cannot be sufficiently followed and the sealing performance is deteriorated. There is. Further, since the rip portion 4 is thick, the eccentric load, that is, the load received by the rip portion 4 due to the eccentric movement of the shaft 1 also becomes large, so that stress concentration and repetitive stress act on the root 9 of the rip, resulting in poor durability. .
そこでこの考案の目的は、シール性および耐久性の高い
偏心動用耐圧オイルシールを提供することにある。Therefore, an object of the present invention is to provide a pressure resistant oil seal for eccentric movement, which has high sealability and durability.
〈課題を解決するための手段〉 この考案によるオイルシールは、軸に当接する少なくと
も一条のリツプを有するリツプ部と補強環により補強さ
れた取付部との間を薄肉の湾曲部で連結したシール部材
と、このシール部材の湾曲部の軸方向外側面に沿う形状
を有するシール部材支持部を有するバツクアツプリング
と、シール部材の取付部に固定されてバツクアツプリン
グを径方向移動可能に保持するホルダーとを備えてい
る。<Means for Solving the Problems> An oil seal according to the present invention is a seal member in which a lip portion having at least one row of a lip that abuts a shaft and a mounting portion reinforced by a reinforcing ring are connected by a thin curved portion. And a back up ring having a seal member support portion having a shape along the axially outer side surface of the curved portion of the seal member, and a holder fixed to the mounting portion of the seal member and movably holding the back up ring in the radial direction. It has and.
〈作用〉 軸の偏心動に伴つてシール部材の薄い湾曲部が伸縮する
ので、軸の偏心動に対する追従性が高く、偏心荷重も小
さくなり、リツプ全体への集中応力や繰り返し疲労が少
ない。また、シール部材の薄い湾曲部はバツクアツプリ
ングのシール部材支持部によつて支持されているので、
高い流体圧力に対しても十分に対抗することができる。
また、バツクアツプリングが径方向に移動可能とされて
いるので、軸が偏心動しても常にシール部材支持部が湾
曲部を支持する。<Operation> Since the thin curved portion of the seal member expands and contracts with the eccentric movement of the shaft, the followability with respect to the eccentric movement of the shaft is high, the eccentric load is small, and the concentrated stress and repeated fatigue on the entire rip are small. Further, since the thin curved portion of the seal member is supported by the seal member support portion of the back up ring,
It can sufficiently counter high fluid pressures.
Further, since the backup ring is movable in the radial direction, the seal member support portion always supports the curved portion even if the shaft is eccentrically moved.
〈実施例〉 第１図には、この考案の第１実施例が示されている。こ
の図において、このオイルシールが取付けられるハウジ
ングの内部をＡとし、外部をＢとする。したがつて内部
Ａ側にシール対象となる液体が存在する。このオイルシ
ールは、シール部材11とバツクアツプリング12とホルダ
ー13とからなる。<Embodiment> FIG. 1 shows a first embodiment of the present invention. In this figure, the inside of the housing to which this oil seal is attached is A, and the outside is B. Therefore, the liquid to be sealed exists on the inside A side. This oil seal comprises a seal member 11, a back-up ring 12 and a holder 13.
ゴム製のシール部材11は、軸14に当接する三条のリツプ
15,16,17を有するリツプ部18と、補強環19により補強さ
れた軸方向に延びる取付部20と、リツプ部18と取付部20
との間を連結する外部Ｂ側に凸に湾曲した薄肉部21とか
らなる。The rubber seal member 11 is a three-way lip that contacts the shaft 14.
A lip portion 18 having 15, 16 and 17, an attachment portion 20 extending in the axial direction reinforced by a reinforcement ring 19, a lip portion 18 and an attachment portion 20.
And a thin-walled portion 21 that is convexly curved to the outside B side for connecting between and.
合成樹脂等の剛性部材からなるバツクアツプリング12
は、シール部材11の湾曲部21の外部Ｂ側側面21aに沿う
形状を有するシール部材支持部22と、リツプ部18の径方
向外周面に取り付けられたスプリング23にほぼ接するよ
うに内部Ａ側に向けて延設された偏心動追従強制部24と
を有する。スプリング23がないタイプの場合は、偏心動
追従強制部24はリツプ部18の径方向外周面に直接的にほ
ぼ接する。Backing ring 12 made of rigid material such as synthetic resin
Is on the inside A side so as to be almost in contact with the seal member support portion 22 having a shape along the outer B side surface 21a of the curved portion 21 of the seal member 11 and the spring 23 attached to the radial outer peripheral surface of the lip portion 18. And an eccentricity follow-up forcing unit 24 extending toward the front. In the case of the type in which the spring 23 is not provided, the eccentricity follow-up force portion 24 is in direct contact with the outer circumferential surface of the lip portion 18 in the radial direction.
金属製のホルダー13は、穴開き円板部25とその周縁に内
部Ａ側に向けて延設された円筒部26とからなり、円筒部
26をシール部材11の取付部20の内周面に固定することに
より、円板部25がバツクアツプリング12を径方向に移動
可能にかつ加圧時に抜け出さないように保持している。
円筒部26はシール部材11の取付部20の外周面に固定する
ようにしてもよい。The metal holder 13 is composed of a perforated disc portion 25 and a cylindrical portion 26 that extends toward the inside A side around the perforated disc portion 25.
By fixing 26 to the inner peripheral surface of the mounting portion 20 of the seal member 11, the disk portion 25 holds the backup ring 12 so that it can move in the radial direction and does not come off during pressurization.
The cylindrical portion 26 may be fixed to the outer peripheral surface of the mounting portion 20 of the seal member 11.
次に作用について説明する。軸14が偏心動すると、シー
ル部材11のリツプ部18が軸14に追従して図において上下
に運動する。リツプ部18は、薄肉の湾曲部21に支持され
ているので、軸14の偏心動に対して小さな偏心荷重でも
容易に追従する。また、内部Ａの流体の圧力が矢印Ｃ方
向から薄肉の湾曲部21に加わつても、その背後にはバツ
クアツプリング12のシール部材支持部22が対向している
ので、湾曲部21はシール部材支持部22に支持されて異常
変形が防止される。バツクアツプリング12は径方向に移
動可能となつているので、偏心動により湾曲部21とシー
ル部材支持部22の間が大きく離れることはない。Next, the operation will be described. When the shaft 14 is eccentrically moved, the lip portion 18 of the seal member 11 follows the shaft 14 and moves up and down in the drawing. Since the rip portion 18 is supported by the thin curved portion 21, it easily follows the eccentric movement of the shaft 14 even with a small eccentric load. Further, even if the pressure of the fluid in the inside A is applied to the thin curved portion 21 from the direction of arrow C, the seal member supporting portion 22 of the back-up ring 12 faces the back of the thin curved portion 21, so that the curved portion 21 is sealed by the seal member. It is supported by the support portion 22 to prevent abnormal deformation. Since the backup ring 12 is movable in the radial direction, the curved portion 21 and the seal member support portion 22 are not largely separated from each other due to the eccentric movement.
軸14の偏心動に押されてリツプ部18が上方に持ち上げら
れると、リツプ部18はゴム製のリングなので、上方のリ
ツプ部18だけが伸びて下方のリツプ部18が取り残され、
下方のリツプ15,16,17と軸14との間に隙間が発生しよう
とするが、この実施例ではバツクアツプリング12の偏心
動追従強制部24がスプリング23にほぼ接しているので、
バツクアツプリング12が軸14の偏心動に追従することに
より、リツプ部18が偏心動追従強制部24により一定の範
囲（直径）内に位置規制され、軸14がどのように複雑に
または急速に偏心動しようともその全周にわたつてリツ
プ15,16,17が常に圧接することになり、シール性が確実
に保持される。また、前記偏心動追従強制部24はリツプ
部18が内部Ａの流体の圧力により浮き上るのを防止す
る。When the rip portion 18 is lifted upward by being pushed by the eccentric movement of the shaft 14, the rip portion 18 is a rubber ring, so only the upper rip portion 18 extends and the lower rip portion 18 is left behind.
A gap tends to occur between the lower lips 15, 16, 17 and the shaft 14, but in this embodiment, the eccentricity follow-up force portion 24 of the back up ring 12 is almost in contact with the spring 23,
When the back-up ring 12 follows the eccentric movement of the shaft 14, the rip portion 18 is restricted in position within a certain range (diameter) by the eccentric-motion follow-up force portion 24, and how the shaft 14 is complicatedly or rapidly changed. Even if the eccentric movement occurs, the lips 15, 16 and 17 are constantly in pressure contact with each other over the entire circumference, so that the sealing property is surely maintained. Further, the eccentricity follow-up force part 24 prevents the rip part 18 from floating due to the pressure of the fluid in the inside A.
上記実施例においては、シール部材11の湾曲部21は外部
Ｂ側に向けて凸に湾曲しているが、これは径方向に変形
可能であればどのような湾曲形状であつてもよい。この
場合は、当然のことながら、バツクアツプリング12のシ
ール部材支持部22の形状も、その湾曲形状に実質的に沿
うように形成する。In the above embodiment, the curved portion 21 of the seal member 11 is convexly curved toward the outside B side, but it may have any curved shape as long as it can be deformed in the radial direction. In this case, as a matter of course, the shape of the seal member support portion 22 of the backup ring 12 is also formed so as to substantially follow the curved shape.
またこの考案によるオイルシールは、シール対象をオイ
ルに限定するものではなく、種々の流体をシール対象と
することができるものである。Further, the oil seal according to the present invention is not limited to oil as a sealing target, and various fluids can be a sealing target.
第３図及び第４図はこの考案の第２実施例を示すもの
で、第３図はハウジングの内部Ａに圧力が作用していな
い状態を示し、また第４図は内部Ａに例えば5kgf/cm2程
度の圧力が作用している状態を示している。この第２実
施例は安定化リップ30を設けた点のみにおいて第１実施
例と相違し、その他の構成は第１実施例のそれと同様で
あり、第3,4図において、第１図と同様の部分は同様の
符号で示されている。安定化リップ30はリップ15の軸方
向内側に位置し、リップ部18の軸方向内側面18aから軸1
4へ向けて傾斜して延び、先端が軸14に接触している。FIGS. 3 and 4 show a second embodiment of the present invention. FIG. 3 shows a state where no pressure is applied to the inside A of the housing, and FIG. It shows a state where a pressure of about cm 2 is acting. The second embodiment is different from the first embodiment only in that a stabilizing lip 30 is provided, and the other structure is similar to that of the first embodiment, and in FIGS. 3 and 4, it is similar to FIG. The part of is shown with the same code. The stabilizing lip 30 is located on the inner side of the lip 15 in the axial direction, and extends from the inner side surface 18a of the lip portion 18 in the axial direction to the shaft 1
It extends slantingly toward 4 and its tip is in contact with the shaft 14.
この第２実施例においては、ハウジングの内部Ａに高圧
が作用したときに、安定化リップ30が第４図のように軸
14に押付けられることによって、リップ15,16,17と軸14
との接触角は適切に維持され、従って密封性能は常に良
好に維持される。すなわち、既述の第１実施例において
は、ハウジングの内部Ａに高圧が作用すると、リップ部
18が第２図に示したように時計方向へ捩られてリップ1
5,16,17と軸14との接触角が変化し、極端な場合には図
示されているようにリップ15と軸14とが非接触の状態に
なったりして、密封性能が損なわれる恐れがあるが、第
２実施例においてはこのような欠点が解消される。In this second embodiment, when a high pressure is applied to the inside A of the housing, the stabilizing lip 30 has a shaft as shown in FIG.
By being pressed against 14, the lips 15, 16, 17 and shaft 14
The contact angle with is properly maintained, and thus the sealing performance is always kept good. That is, in the above-described first embodiment, when high pressure acts on the inside A of the housing, the lip portion
18 is twisted clockwise as shown in FIG.
The contact angle between 5, 16 and 17 and the shaft 14 may change, and in extreme cases, the lip 15 and the shaft 14 may be out of contact with each other as shown in the figure, and the sealing performance may be impaired. However, in the second embodiment, such a drawback is solved.
なお、第２図のような状態は、ハウジングの内部Ａに高
圧が作用した場合のみではなく、軸14の偏心動に応じて
リップ部18が捩られた場合にも生じる。安定化リップ30
によって、このような軸14の偏心動に応じた、リップ1
5,16,17と軸14との接触角の変化をも防止できることは
明らかである。The state shown in FIG. 2 occurs not only when a high pressure is applied to the inside A of the housing but also when the lip portion 18 is twisted in accordance with the eccentric movement of the shaft 14. Stabilizing lip 30
Depending on such eccentric movement of the shaft 14, the lip 1
It is obvious that the change of the contact angle between the shafts 5, 16 and 17 and the shaft 14 can be prevented.
第3,4図に示されている安定化リップ30に代えて、第５
図に示したような円形断面の先端部を有する安定化リッ
プ30′、或いは第６図に示したような、Ｖ形の底面と凹
形の頂面とを有する形状の安定化リップ30″を使用して
もよい。また、第７図のように、三条のリップ15,16,17
に加えて、リップ15の内側にもう一つのリップ31を設
け、その内側に短い安定化リップ30を設けてもよい。Instead of the stabilizing lip 30 shown in FIGS.
A stabilizing lip 30 'having a circular cross-section tip as shown, or a stabilizing lip 30 "having a V-shaped bottom and a concave top as shown in FIG. It can also be used, and as shown in Fig. 7, three-way lip 15,16,17
In addition, another lip 31 may be provided inside the lip 15 and a short stabilizing lip 30 may be provided inside it.
〈考案の効果〉 以上のように、この考案による偏心動用耐圧オイルシー
ルは、シール部材のリツプ部と取付部との間を薄肉の湾
曲部で連結するとともに、その湾曲部をバツクアツプリ
ングで保持するようにしたので、軸の偏心動に対する追
従性および耐圧性が高く、偏心荷重も小さいので耐久性
が向上し、また偏心動を大きく取れる利点がある。<Effect of the Invention> As described above, the eccentric pressure-resistant oil seal according to the present invention connects the lip portion and the mounting portion of the seal member with a thin curved portion and holds the curved portion with a back-up ring. Therefore, there is an advantage that the followability to the eccentric movement of the shaft and the pressure resistance are high, and the eccentric load is small so that the durability is improved and the eccentric movement can be largely taken.
第１図は、この考案の第１実施例の偏心動用耐圧オイル
シールの断面図、第２図は第１図のオイルシールの内側
に高圧が作用したときの状態を示す、第１図と同様の断
面図、第３図はこの考案の第２実施例の偏心動用耐圧オ
イルシールの断面図、第４図は第３図のオイルシールの
内側に高圧が作用したときの状態を示す、第３図と同様
の断面図、第５図から第７図は上記第２実施例のオイル
シールの変形例を示す部分断面図、第８図は従来の耐圧
オイルシールの一例を示す断面図である。 11……シール部材、12……バツクアツプリング、13……
ホルダー、14……軸、15,16,17,31……リツプ、18……
リツプ部、19……補強環、20……取付部、21……湾曲
部、22……シール部材支持部、23……スプリング、24…
…偏心動追従強制部、25……円板部、26……円筒部、3
0,30′,30″,30……安定化リップ Ａ……内部、Ｂ……外部、Ｃ……流体圧力方向。1 is a sectional view of a pressure resistant oil seal for eccentric movement of the first embodiment of the present invention, and FIG. 2 shows a state when a high pressure is applied to the inside of the oil seal of FIG. 1, similar to FIG. FIG. 3 is a sectional view of a pressure resistant oil seal for eccentric movement according to a second embodiment of the present invention, and FIG. 4 shows a state when a high pressure is applied to the inside of the oil seal of FIG. 5 is a sectional view showing a modification of the oil seal of the second embodiment, and FIG. 8 is a sectional view showing an example of a conventional pressure resistant oil seal. 11 …… Seal member, 12 …… Back up ring, 13 ……
Holder, 14 …… Axis, 15,16,17,31 …… Rip, 18 ……
Lip part, 19 ... Reinforcing ring, 20 ... Mounting part, 21 ... Curved part, 22 ... Seal member support part, 23 ... Spring, 24 ...
… Eccentricity follow-up force part, 25 …… disc part, 26 …… cylindrical part, 3
0,30 ′, 30 ″, 30 …… Stabilizing lip A …… Inside, B …… Outside, C …… Fluid pressure direction.
Claims (3)
するリツプ部と補強環により補強された取付部との間を
薄肉の湾曲部で連結したシール部材と、 前記シール部材の湾曲部の軸方向外側面に沿う形状を有
するシール部材支持部を有するバツクアツプリングと、 前記シール部材の取付部に固定されて前記バツクアツプ
リングを径方向に移動可能に保持するホルダーとを備え
た偏心動用耐圧オイルシール。1. A seal member having a thin curved portion connecting between a lip portion having at least one row of abutment against a shaft and a mounting portion reinforced by a reinforcing ring, and an axial direction of the curved portion of the seal member. Eccentric pressure resistant oil including a back up ring having a seal member supporting portion having a shape along the outer side surface, and a holder fixed to a mounting portion of the seal member and holding the back up ring movably in a radial direction. sticker.
ルにおいて、前記バツクアツプリングに、前記シール部
材のリツプ部の径方向外周面またはそこに取付けられた
スプリングにほぼ接するように偏心動追従強制部を設け
たことを特徴とする偏心動用耐圧オイルシール。2. The eccentric pressure-resistant oil seal according to claim 1, wherein the back-up ring is eccentrically tracked so as to be substantially in contact with a radial outer peripheral surface of a lip portion of the seal member or a spring attached thereto. A pressure-resistant oil seal for eccentric movements, which is equipped with a forced part.
ルシールにおいて、前記リップ部が、前記リップよりも
軸方向内側に位置していて前記リップ部の軸方向内側面
から軸へ向けて傾斜して延び、先端が軸に接触する安定
化リップを有することを特徴とする偏心動用耐圧オイル
シール。3. The eccentric pressure-resistant oil seal according to claim 1, wherein the lip portion is located axially inward of the lip and extends from the axially inner side surface of the lip portion toward the shaft. A pressure-resistant oil seal for eccentric movement, which has a stabilizing lip extending obliquely and having a tip contacting a shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990081404U JPH0733016Y2 (en) | 1989-09-29 | 1990-07-31 | Pressure resistant oil seal for eccentric movement |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11441489 | 1989-09-29 | ||
| JP1-114414 | 1989-09-29 | ||
| JP1990081404U JPH0733016Y2 (en) | 1989-09-29 | 1990-07-31 | Pressure resistant oil seal for eccentric movement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0381460U JPH0381460U (en) | 1991-08-20 |
| JPH0733016Y2 true JPH0733016Y2 (en) | 1995-07-31 |
Family
ID=31890198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990081404U Expired - Lifetime JPH0733016Y2 (en) | 1989-09-29 | 1990-07-31 | Pressure resistant oil seal for eccentric movement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0733016Y2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7007715B2 (en) * | 2001-11-22 | 2006-03-07 | Nok Corporation | Pressure release valve |
| JP2007263234A (en) * | 2006-03-28 | 2007-10-11 | Komatsu Ltd | Bearing seal and bearing device |
| JP5168475B2 (en) * | 2008-03-07 | 2013-03-21 | Ｎｏｋ株式会社 | Universal joint seal |
| JP2011231781A (en) * | 2010-04-23 | 2011-11-17 | Nippon Valqua Ind Ltd | Sliding seal component |
| JP6468702B2 (en) * | 2013-11-22 | 2019-02-13 | 光洋シーリングテクノ株式会社 | Sealing device |
| DE102017202608A1 (en) * | 2017-02-17 | 2018-08-23 | Trelleborg Sealing Solutions Germany Gmbh | Sealing arrangement with optimized lubrication behavior |
-
1990
- 1990-07-31 JP JP1990081404U patent/JPH0733016Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0381460U (en) | 1991-08-20 |
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