JPS6221178Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案はオイルシールの改良に関し、さらに詳
しくはシール部の回転側部材を構成するオイルシ
ールにおいて常時安定した動的しめ代を保持して
シール性能の向上を計つたオイルシールを提供す
ることを目的とする。[Detailed description of the invention] The present invention relates to the improvement of oil seals, and more specifically, the invention relates to the improvement of oil seals, and more specifically, to the oil seal that constitutes the rotating side member of the seal part, the oil seal is designed to maintain a stable dynamic interference at all times and improve seal performance. The purpose is to provide a seal.

一般に合成ゴムによつて形成されるこの種オイ
ルシールのシール部材は環状を呈するリツプ部を
有し、該リツプ部内周端と対向固定部材の外周面
が摺接して流体をシールするが、シール性能を高
めるために、上記リツプ部の内径は被外挿部材で
ある上記固定部材の外径に比べてあらかじめわず
かに小径になるべく形成されるとともに、上記リ
ツプ部の外周面にコイルスプリング等の緊締環が
締着されて、上記固定部材に対する緊迫力が付与
されるように構成されている。 The sealing member of this type of oil seal, which is generally made of synthetic rubber, has an annular lip portion, and the inner circumferential end of the lip portion and the outer circumferential surface of the opposing fixing member slide against each other to seal fluid. In order to increase the stability, the inner diameter of the lip part is formed in advance to be slightly smaller than the outer diameter of the fixed member, which is the member to be inserted, and a tightening ring such as a coil spring is attached to the outer circumferential surface of the lip part. is configured to be tightened to apply a tension force to the fixing member.

しかしながら、従来のオイルシールは、摺回動
を起因とする遠心力の発生により、回転数が増加
するに連れて上記リツプ部の固定部材に対する動
的しめ代が漸次減少し、遂には上記リツプ部材が
対向固定部材から離反してシール破壊を生ずるお
それを有している。第１図はこの過程をグラフ化
して示したものである。この欠点に対しては従来
上記リツプ部に対して過大な初期しめ代を付与す
ることによつて常態回転時になお適切な動的しめ
代を残すべく構成したものも散見されるが、低速
回転時における摺動部の摩擦抵抗が過大となり、
上記リツプ部の早期摩耗を招来する問題点があつ
た。 However, in conventional oil seals, due to the generation of centrifugal force caused by sliding rotation, as the rotational speed increases, the dynamic interference of the lip portion with respect to the fixing member gradually decreases, and eventually the lip member There is a risk that the seal may separate from the opposing fixing member and cause seal failure. FIG. 1 shows this process graphically. To address this drawback, there have been some conventional constructions in which an excessive initial tightening allowance is given to the lip portion to leave an appropriate dynamic tightening allowance during normal rotation, but when rotating at low speeds, The frictional resistance of the sliding part becomes excessive,
There was a problem in that the lip portion was prematurely worn.

本考案は以上の点に鑑み、上記リツプ部の外周
に摺回動を起因とする遠心力による上記リツプ部
の拡開防止用ストツパ部材を設けて、常時適切な
動的しめ代を保持するオイルシールを提供せんと
するものである。本考案のオイルシールは上記ス
トツパ部材を設けたことにより、第２図のグラフ
に示すとうり回転数の増加に拘わらず、対向固定
部材に対する動的しめ代を保持し、シール性能に
優れたものとなる。 In view of the above points, the present invention provides a stopper member on the outer periphery of the lip portion to prevent the lip portion from expanding due to centrifugal force caused by sliding rotation, and the oil retains an appropriate dynamic interference at all times. It is intended to provide a seal. The oil seal of the present invention is equipped with the above-mentioned stopper member, and as shown in the graph of Fig. 2, it maintains the dynamic interference with respect to the opposing fixed member regardless of the increase in rotational speed, and has excellent sealing performance. becomes.

以下、本考案の一実施例を図面にしたがつて説
明する。１は断面略Ｌ字形を呈する金属製の環状
ケースであり、該環状ケース１の内縁２に環状の
合成ゴム製シール部材４が加硫接着されている。
該シール部材４はリツプ部５を一体的に形成して
なり、該リツプ部５の内周端６が対向固定部材
（図示せず）に対して摺動部を構成する。上記リ
ツプ部５の外周面７にはコイルスプリングからな
る緊締環８が締着され、上記リツプ部５に対向固
定部材に対する緊迫力を付与するようになる。９
は断面略コ字形を呈する金属製環体のストツパ部
材であり、外環部１０を上記環状ケース１の外環
部３にかしめ固定されるとともに内環部１１が軸
方向に屈曲形成されてなり、該内環部１１と上記
緊締環８間にはわずかの隙間ａが設けられる。 An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a metal annular case having a substantially L-shaped cross section, and an annular synthetic rubber sealing member 4 is vulcanized and bonded to the inner edge 2 of the annular case 1.
The sealing member 4 is integrally formed with a lip portion 5, and the inner circumferential end 6 of the lip portion 5 constitutes a sliding portion with respect to an opposing fixing member (not shown). A tightening ring 8 made of a coil spring is fastened to the outer circumferential surface 7 of the lip portion 5, and applies a tightening force to the lip portion 5 against the opposing fixing member. 9
is a stopper member made of a metal ring having a substantially U-shaped cross section, and has an outer ring part 10 fixed to the outer ring part 3 of the annular case 1 by caulking, and an inner ring part 11 bent in the axial direction. , a slight gap a is provided between the inner ring portion 11 and the tightening ring 8.

上記構成のオイルシールは、各種シール機器の
回転部材に内挿固着されて、該回転部材に従動す
るとともに上記リツプ部５の内周端６と軸状を呈
する対向固定部材とが摺回動して流体をシールす
るものであり、該摺動部には上記緊締環８によつ
て、まず回転停止時において充分なしめ代が付与
されて確実に流体をシールする。 The oil seal having the above structure is inserted into and fixed to a rotating member of various sealing devices, and is driven by the rotating member, and the inner circumferential end 6 of the lip portion 5 and the opposing fixing member having a shaft shape slide and rotate. The sliding portion is first provided with a sufficient tightening allowance by the tightening ring 8 when the rotation is stopped, thereby reliably sealing the fluid.

回転が始まり、回転数が漸次増加すると、シー
ル部材４のリツプ部５は回転に伴なう遠心力によ
つて漸次拡開するが、上記リツプ部５の内周端６
が上記対向固定部材外周面から離反する以前に、
緊締環８がストツパ部材９の内環部１１に当接し
て、該状態以上の上記リツプ部５の拡開を規制す
るようになる。該状態におけるシール部材４のリ
ツプ部５には上記固定部材に対する動的しめ代を
残すことが望ましく、上記ストツパ部材９の内環
部１１内径値は、該状態において上記リツプ部５
が適切な動的しめ代を保持する値になるべくあら
かじめ計算の上、設定するものとする。これによ
り上記構成のオイルシールは、第２図に示したご
とく、常時適切な動的しめ代を保持して確実な流
体シールを行なうことができる。 When the rotation starts and the number of rotations gradually increases, the lip portion 5 of the seal member 4 gradually expands due to the centrifugal force accompanying the rotation, but the inner peripheral end 6 of the lip portion 5 gradually expands.
Before separating from the outer circumferential surface of the opposing fixing member,
The tightening ring 8 comes into contact with the inner ring portion 11 of the stopper member 9 to restrict the expansion of the lip portion 5 beyond this state. It is desirable to leave a dynamic interference margin with respect to the fixing member in the lip portion 5 of the seal member 4 in this state, and the inner diameter value of the inner ring portion 11 of the stopper member 9 is set to
shall be calculated and set in advance to a value that maintains an appropriate dynamic interference. As a result, as shown in FIG. 2, the oil seal having the above structure can maintain an appropriate dynamic interference at all times to provide reliable fluid sealing.

つぎに、第４図は本考案の第２の実施例を示
し、上記第１実施例と相為する部分についてのみ
説明すると、本実施例のオイルシールのストツパ
部材９ａは、断面半円弧状を呈する金属製環体に
なり、上記緊締環８の外周に嵌着されている。該
構成のオイルシールは、上記第１実施例と比較し
て緊締環８とストツパ部材９ａ間に隙間を有さな
いものの、上記シール部材４のリツプ部５の遠心
力による拡開を規制して、該リツプ部５に対向固
定部材に対する適切な動的しめ代を付与し、上記
第１実施例のオイルシールと同様に優れたシール
効果を発揮し得るものである。 Next, FIG. 4 shows a second embodiment of the present invention. Only the parts corresponding to the first embodiment will be explained. The stopper member 9a of the oil seal of this embodiment has a semicircular arc shape in cross section. The ring body is a metal ring body having a similar shape, and is fitted onto the outer periphery of the tightening ring 8. Although the oil seal with this configuration does not have a gap between the tightening ring 8 and the stopper member 9a compared to the first embodiment, it does not prevent the lip portion 5 of the seal member 4 from expanding due to centrifugal force. By providing the lip portion 5 with an appropriate dynamic interference with respect to the opposing fixing member, it is possible to exhibit an excellent sealing effect similar to the oil seal of the first embodiment.

以上説明したように、本考案によればストツパ
部材によつてリツプ部の拡開が規制されるので、
回転数の増加に伴つてリツプ部が固定部材から離
反してしまうといつたことがない。しかも、固定
部材が挿入されるとストツパ部材の内周面は緊締
環と当接するので、回転数が増加しても停止時以
上にリツプ部が拡開することはない。したがつ
て、低速時から高速時にわたつて常に一定の動的
しめ代が確保されるので、優れたシール性能を有
することとなる。 As explained above, according to the present invention, the expansion of the lip portion is regulated by the stopper member.
It never happens that the lip part separates from the fixed member as the rotational speed increases. Furthermore, when the fixing member is inserted, the inner circumferential surface of the stopper member comes into contact with the tightening ring, so that even if the rotational speed increases, the lip portion will not expand any more than when it is stopped. Therefore, a constant dynamic interference is always ensured from low speed to high speed, resulting in excellent sealing performance.

また、固定部材が挿入されるとストツパ部材の
両開口縁部は合成ゴム製シール部材と接触するの
で、緊締環はストツパ部材によつて完全に覆われ
て外部流体と直接接触しなくなる。したがつて、
緊締環の腐食を効果的に防止できるので、寿命の
長いものとなる。 Further, when the fixing member is inserted, both opening edges of the stopper member come into contact with the synthetic rubber sealing member, so that the tightening ring is completely covered by the stopper member and is no longer in direct contact with external fluid. Therefore,
Corrosion of the tightening ring can be effectively prevented, resulting in a long service life.

さらに、本考案のオイルシールは緊締環の外周
に断面半円弧状の内側に開口した金属製環体を嵌
めたものであるから構成がきわめて簡単であり、
ストツパ部材を有しない従来のオイルシールを使
用して廉価に製造することができる。 Furthermore, the oil seal of the present invention is extremely simple in construction because it has a metal ring body with a semicircular arc cross section and an opening on the inside fitted around the outer periphery of the tightening ring.
It can be manufactured at low cost using a conventional oil seal without a stopper member.

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

図面は本考案の実施例を示し、第１図は従来製
品における回転数と動的しめ代の関係を示すグラ
フ、第２図は本考案のオイルシールにおける回転
数と動的しめ代の関係を示すグラフ、第３図は第
１実施例に係るオイルシールの半裁正断面図、第
４図は第２実施例に係るオイルシールの要部半裁
正断面図である。 １……環状ケース、４……シール部材、５……
リツプ部、６……内周端、８……緊締環、９，９
ａ……ストツパ部材、１１……内環部、ａ……隙
間。 The drawings show an embodiment of the present invention, and Fig. 1 is a graph showing the relationship between the rotation speed and dynamic interference in a conventional product, and Fig. 2 is a graph showing the relationship between the rotation speed and dynamic interference in the oil seal of the present invention. 3 is a half-cut sectional view of the oil seal according to the first embodiment, and FIG. 4 is a half-cut sectional view of the main part of the oil seal according to the second embodiment. 1... Annular case, 4... Seal member, 5...
Lip portion, 6... Inner peripheral end, 8... Tightening ring, 9, 9
a... Stopper member, 11... Inner ring portion, a... Gap.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 合成ゴム製シール部材のリツプ部の外周面に緊
締環を締着して固定部材に対する緊迫力を形成し
てなるオイルシールにおいて、前記緊締環の外周
にはリツプ部の拡開を規制する断面半円弧状の内
側に開口した金属製環体であるストツパ部材が嵌
められていて、前記固定部材が挿入されると、前
記ストツパ部材の内周面は前記緊締環と当接し、
前記ストツパ部材の両開口縁部は前記合成ゴム製
シール部材と接触することを特徴とするオイルシ
ール。 In an oil seal in which a tightening ring is fastened to the outer circumferential surface of a lip portion of a synthetic rubber seal member to form a tightening force against a fixed member, the outer circumference of the tightening ring has a cross-sectional half that restricts expansion of the lip portion. A stopper member, which is a metal ring body opening inwardly in a circular arc shape, is fitted, and when the fixing member is inserted, the inner circumferential surface of the stopper member comes into contact with the tightening ring,
An oil seal characterized in that both opening edges of the stopper member are in contact with the synthetic rubber seal member.