JP2006125538A - Pressure resistant oil seal - Google Patents

Pressure resistant oil seal Download PDF

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Publication number
JP2006125538A
JP2006125538A JP2004315362A JP2004315362A JP2006125538A JP 2006125538 A JP2006125538 A JP 2006125538A JP 2004315362 A JP2004315362 A JP 2004315362A JP 2004315362 A JP2004315362 A JP 2004315362A JP 2006125538 A JP2006125538 A JP 2006125538A
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Prior art keywords
oil seal
pressure
seal lip
resistant oil
fixed sealing
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JP2004315362A
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Japanese (ja)
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Akihiro Sato
彰洋 佐藤
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Nok Corp
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Nok Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/3456—Pressing means without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • F16J15/3212—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings with metal springs

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure resistant oil seal usable even under high pressure conditions exceeding a specified level and also enabling an increase in the durability of an oil seal lip without increasing the number of parts in the pressure resistant oil seal used under high pressure conditions such as in fuel pumps. <P>SOLUTION: The seal lip 57 having a sliding surface 57A formed of a resin in a wedge shape which slides on the radial end face (22 or 71A) of one member 2 or a sleeve 7 is formed in a fixed sealing part 52. Also, a projection 58 is formed on the surface 55a of the fixed sealing part 52 in contact with the other member 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、互いに相対可動自在に組み付けられた同心である２部材間の環状の隙間をシールする密封装置の一種である耐圧用オイルシールに関する。   The present invention relates to a pressure-resistant oil seal that is a kind of a sealing device that seals an annular gap between two concentric members assembled so as to be movable relative to each other.

従来、例えば図３に示す耐圧用オイルシールが知られている。この耐圧用オイルシール１０１は、ハウジング１０２に固定密封部１０３を介して嵌合している金属環１０４と、合成ゴムからなり固定密封部１０３と一体に加硫成形されて金属環１０４に接着し軸１０５に摺動するオイルシールリップ１０６とを備え、この合成ゴムからなるオイルシールリップ１０６の受圧面積を通常のオイルシールより小さくするとともに剛性を持たせたものである。   Conventionally, for example, a pressure-resistant oil seal shown in FIG. 3 is known. The pressure-resistant oil seal 101 includes a metal ring 104 fitted to the housing 102 via a fixed sealing part 103 and a synthetic rubber vulcanized and molded integrally with the fixed sealing part 103 and bonded to the metal ring 104. An oil seal lip 106 that slides on the shaft 105 is provided, and the pressure receiving area of the oil seal lip 106 made of synthetic rubber is made smaller than that of a normal oil seal and has rigidity.

また、図４に示す耐圧用オイルシール１０１は、更に保持器１０７を金属環１０４と一体に備え、この保持器１０７で圧力による合成ゴムからなるオイルシールリップ１０６の変形を小さくさせたものである。   Further, the pressure-resistant oil seal 101 shown in FIG. 4 further includes a cage 107 integrally with the metal ring 104, and the cage 107 reduces deformation of the oil seal lip 106 made of synthetic rubber due to pressure. .

しかし、前記耐圧用オイルシール１０１は耐圧性に優れるものの、オイルシールリップ１０６が合成ゴムで成形されているゴムリップタイプであるため、ある一定以上の高圧条件下では使用不可となり、また、一つのオイルシールリップ１０６で圧力と油の両方をシールするため、圧力に対してはダメージが大きく耐久性に乏しいという問題点を有していた。   However, although the pressure-resistant oil seal 101 is excellent in pressure resistance, since the oil seal lip 106 is a rubber lip type formed of synthetic rubber, it cannot be used under a certain high pressure condition. Since both the pressure and the oil are sealed by the oil seal lip 106, there is a problem that the pressure is greatly damaged and the durability is poor.

この問題点を解決するために、オイルシールリップの材質を樹脂に変更することが試みられたが、樹脂製にすることにより軸への密着性の不足から密封対象の完全封止が難しく、永久変形や摩耗面の筋などによる漏れ増加が起き易いとの問題点があった。また、合成ゴムからなるゴムリップタイプのオイルシールリップとは別体に耐圧用の樹脂製シールリップを設けて軸方向周面に摺接させ圧力をシールすることが提案されているが（下記特許文献１を参照）、部品点数が増加するとともに軸方向周面に摺動させるので径方向への緊迫力が作用し、しめ代が高くなるとの問題点を有していた。   In order to solve this problem, an attempt was made to change the material of the oil seal lip to resin. However, by using a resin, it is difficult to completely seal the object to be sealed due to insufficient adhesion to the shaft. There is a problem that leakage increases due to deformation or wear surface stripes. In addition, it has been proposed that a pressure-resistant resin seal lip is provided separately from a rubber lip type oil seal lip made of synthetic rubber and is slidably contacted with the circumferential surface in the axial direction to seal the pressure (the following patent) (Refer to Document 1), there is a problem that the number of parts is increased and sliding is performed on the circumferential surface in the axial direction.

実公平０５−００３８１９号公報No. 05-003819

本発明は以上の点に鑑みて、燃料ポンプ等の高圧条件下で使用される耐圧用オイルシールにおいて、一定以上の高圧条件化でも使用することができ、しかも部品点数が増加することなくオイルシールリップの耐久性を向上することができる耐圧用オイルシールを提供することを目的とする。   In view of the above, the present invention can be used in a pressure-resistant oil seal used under high pressure conditions such as a fuel pump, and can be used even under a certain high pressure condition, and the oil seal without increasing the number of parts. An object of the present invention is to provide a pressure-resistant oil seal capable of improving the durability of a lip.

上記目的を達成するため、本発明の請求項１に係る耐圧用オイルシールは、一の部材に固定密封部を介して嵌合する金属環と、前記固定密封部と他の部材に摺動するオイルシールリップを有するシール部からなるシール本体部と、を備えた耐圧用オイルシールにおいて、前記他の部材の径方向端面に摺動する摺動面が樹脂で楔形状のシールリップを前記固定密封部に設けたことを特徴とするものである。   In order to achieve the above object, a pressure-resistant oil seal according to claim 1 of the present invention slides on a metal ring fitted to one member via a fixed sealing portion, the fixed sealing portion and another member. A pressure-resistant oil seal comprising a seal body having a seal portion having an oil seal lip, wherein the sliding surface sliding on the radial end surface of the other member is made of resin and the wedge-shaped seal lip is fixed and sealed It is provided in the part.

また、請求項２に係る耐圧用オイルシールは、一の部材に固定密封部を介して嵌合する金属環と、前記固定密封部と他の部材に嵌合したスリンガに摺動するオイルシールリップを有するシール部からなるシール本体部と、を備えた耐圧用オイルシールにおいて、前記スリンガのフランジ部に摺動する摺動面が樹脂で楔形状のシールリップを前記固定密封部に設けたことを特徴とするものである。   According to a second aspect of the present invention, a pressure-resistant oil seal includes a metal ring fitted to one member via a fixed sealing portion, and an oil seal lip that slides on a slinger fitted to the fixed sealing portion and another member. A pressure-resistant oil seal comprising a seal body having a seal portion having a sliding surface sliding on a flange portion of the slinger and a wedge-shaped seal lip provided on the fixed sealing portion. It is a feature.

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち、上記構成を備えた本発明の耐圧用オイルシールは、固定密封部に減圧を目的として、摺動面が樹脂で楔形状のシールリップが径方向端面に摺動するように設けているので、ポンプ等のサージ圧を減圧しオイルシールリップへの負荷を低減し高圧条件下での使用を可能にするとともにオイルシールリップの耐久性向上を図ることができる。また、減圧用のシールリップ形状が楔形状であるので、油を漏らしてオイルシールリップへの潤滑供給を行い安定した密封性能を維持することができる。更に、減圧用のシールリップは径方向端面に摺動する端面リップタイプであり、軸方向端面に摺動するラジアルリップ形状タイプに比べ緊迫力が作用せず、軽微なしめ代を設定することができるとともに、突起が形成されているので、しめ代を設定するための位置決めを容易に行うことができる。   In other words, the pressure-resistant oil seal of the present invention having the above configuration is provided in such a manner that the sliding surface is made of resin and the wedge-shaped seal lip slides on the radial end surface for the purpose of reducing the pressure in the fixed sealing portion. The surge pressure of the pump or the like can be reduced to reduce the load on the oil seal lip, enabling use under high pressure conditions and improving the durability of the oil seal lip. Further, since the pressure-reducing seal lip shape is a wedge shape, oil can be leaked and lubrication can be supplied to the oil seal lip to maintain a stable sealing performance. Furthermore, the pressure-reducing seal lip is an end face lip type that slides on the end face in the radial direction. Compared to the radial lip shape type that slides on the end face in the axial direction, the tightening force does not act, and a slight tightening allowance can be set. In addition, since the projection is formed, positioning for setting the interference can be easily performed.

以下に図面を参照して、この発明の好適な実施の形態を例示して説明する。ただし、この発明の範囲は、特に限定的記載がないかぎりは、この実施の形態に記載されている内容に限定する趣旨のものではない。   Preferred embodiments of the present invention will be described below with reference to the drawings. However, the scope of the present invention is not intended to be limited to the contents described in this embodiment unless otherwise specified.

図１は、本発明の実施例に係る耐圧用オイルシール１を相対可動する軸２とハウジング３とで形成された環状空間に装着した状態を示した断面図であり、この耐圧オイルシール１は、金属環４と、シール本体部５と、を備えている。   FIG. 1 is a sectional view showing a state in which a pressure-resistant oil seal 1 according to an embodiment of the present invention is mounted in an annular space formed by a relatively movable shaft 2 and a housing 3. The metal ring 4 and the seal body 5 are provided.

金属環４は、鋼等の剛性を有する材料で形成されていて、ハウジング３の内周に後述する固定密封部５２を介して嵌合していて円筒部４１と、円筒部４１の反密封対象側Ｂの端末から軸２側に延びるフランジ部４２とからなる。   The metal ring 4 is formed of a material having rigidity such as steel, and is fitted to the inner periphery of the housing 3 via a fixed sealing portion 52 described later, and a cylindrical portion 41 and an anti-sealing target of the cylindrical portion 41. The flange portion 42 extends from the terminal on the side B toward the shaft 2 side.

シール本体部５は、合成ゴムの材料で形成されていて、金属環４のフランジ部４２の内径方向端部に接着しているシール部５１と、シール部５１と一体に成形され、金属環４を被覆するように接着している固定密封部５２からなる。シール部５１は、密封対象側Ａに延び軸２の軸方向周面２１に密接に摺動するオイルシールリップ５１ａと、オイルシールリップ５１ａより反密封対象側Ｂに位置し反密封対象側Ｂに延びて軸２の軸方向周面２１に密接に摺動するサブシールリップ５１ｂとからなる。オイルシールリップ５１ａのリップエッジの反対側である外周側に形成されている凹部５１ｃには、軸２の径方向の変動に追随できるようにガータスプリング６が装着されている。   The seal body portion 5 is formed of a synthetic rubber material, and is formed integrally with the seal portion 51 and the seal portion 51 bonded to the end portion in the inner diameter direction of the flange portion 42 of the metal ring 4. It consists of the fixed sealing part 52 adhere | attached so that it may coat | cover. The seal portion 51 extends to the sealing target side A and slides closely to the axial circumferential surface 21 of the shaft 2, and is located on the anti-sealing target side B and on the anti-sealing target side B from the oil seal lip 51 a. The sub seal lip 51b extends and slides closely on the axial peripheral surface 21 of the shaft 2. A garter spring 6 is attached to a recess 51c formed on the outer peripheral side opposite to the lip edge of the oil seal lip 51a so as to follow the radial variation of the shaft 2.

固定密封部５２は、金属環４のフランジ部４２の反密封対象側Ｂに接着している外側部５３と、フランジ部４２の密封対象側Ａと円筒部４１の内周側に接着している内周部５４と、円筒部４１の外周側でハウジング３の内周面３１と密接している外周部５５と、内周部５４および外周部５５の密封対象側Ａに位置する端部５６からなる。端部５６の密封対象側Ａの端面５６Ａには、摺動面５７Ａに樹脂が焼付けされた楔形状で合成ゴムの減圧用シールリップ５７が設けられ、軸２の径方向端面２２に摺動するようになっている。また、ハウジング３の内周面３１と密接する外周部５５の外周面５５ａには、減圧用シールリップ５７のしめ代を設定するための位置決めの突起５８が形成されている。なお、減圧用シールリップ５７に焼き付けられている樹脂の材質としては、耐圧性に優れる例えばＰＴＦＥが用いられる。   The fixed sealing portion 52 is bonded to the outer side 53 that is bonded to the anti-sealing target side B of the flange portion 42 of the metal ring 4, and to the sealing target side A of the flange portion 42 and the inner peripheral side of the cylindrical portion 41. From the inner peripheral portion 54, the outer peripheral portion 55 in close contact with the inner peripheral surface 31 of the housing 3 on the outer peripheral side of the cylindrical portion 41, and the end portion 56 located on the sealing target side A of the inner peripheral portion 54 and the outer peripheral portion 55. Become. The end face 56A on the sealing object side A of the end portion 56 is provided with a synthetic rubber pressure-reducing seal lip 57 in a wedge shape in which resin is baked on the sliding face 57A, and slides on the radial end face 22 of the shaft 2. It is like that. In addition, a positioning projection 58 for setting a tightening margin of the pressure reducing seal lip 57 is formed on the outer peripheral surface 55 a of the outer peripheral portion 55 in close contact with the inner peripheral surface 31 of the housing 3. In addition, as a material of resin baked on the pressure-reducing seal lip 57, for example, PTFE having excellent pressure resistance is used.

上記構成を備えた耐圧用オイルシール１は、固定密封部５２の端部５６に減圧用シールリップ５７を設け、減圧用シールリップ５７の軸２に対するしめ代をポンプ等のサージ圧の大小により調整して軸２の径方向端面２２に摺動させることが可能となるので、オイルシールリップ５１ａへの負荷を低減し高圧条件下での使用を可能にするとともにオイルシールリップ５１ａの耐久性向上を図ることが可能となる。また、減圧用シールリップ５７の形状が楔形状であるので、油を漏らしてオイルシールリップ５１ａへの潤滑供給を行い安定した密封性能を維持することが可能となる。   The pressure-resistant oil seal 1 having the above-described configuration is provided with a pressure-reducing seal lip 57 at the end 56 of the fixed sealing portion 52, and the interference with the shaft 2 of the pressure-reducing seal lip 57 is adjusted by the surge pressure level of a pump or the like. As a result, it is possible to slide on the radial end face 22 of the shaft 2, thereby reducing the load on the oil seal lip 51 a and enabling use under high pressure conditions, and improving the durability of the oil seal lip 51 a. It becomes possible to plan. Further, since the pressure-reducing seal lip 57 has a wedge shape, it is possible to maintain the stable sealing performance by leaking oil and supplying the oil seal lip 51a with lubrication.

更に、減圧用シールリップ５７は径方向端面２２に摺動する端面リップタイプであり、軸方向端面に摺動するラジアルリップ形状タイプに比べ緊迫力が作用せず、軽微なしめ代を設定することが可能となるとともに、固定密封部５２の外周部５５に突起５８が形成されているので、減圧用シールリップ５７のしめ代を設定するための位置決めを容易に行うことが可能となる。   Further, the pressure-reducing seal lip 57 is an end face lip type that slides on the radial end face 22, and does not act as compared with a radial lip shape type that slides on the end face in the axial direction. In addition, since the protrusion 58 is formed on the outer peripheral portion 55 of the fixed sealing portion 52, positioning for setting the interference margin of the pressure reducing seal lip 57 can be easily performed.

また、減圧用シールリップ５７は合成ゴムで形成され摺動面５７Ａに樹脂が焼付け固定されているので、摺動によるトルクの低減と発熱の防止を図ることが可能となるとともに、リップ剛性を有し圧力による変形を防止することが可能となる。更に、減圧用シールリップ５７は固定密封部５２に一体となり部品点数が増加しないので、耐圧用オイルシール１をハウジング３と軸２とで形成する環状空間へ組付ける際の作業を従来通り容易に行うことが可能となる。   Further, since the pressure reducing seal lip 57 is made of synthetic rubber and the resin is baked and fixed on the sliding surface 57A, it is possible to reduce torque by sliding and to prevent heat generation and to have lip rigidity. It is possible to prevent deformation due to the pressure. Further, since the pressure-reducing seal lip 57 is integrated with the fixed sealing part 52 and the number of parts does not increase, the work for assembling the pressure-resistant oil seal 1 to the annular space formed by the housing 3 and the shaft 2 can be easily performed as before. Can be done.

なお図２に示す通り、減圧用シールリップ５７が摺動する摺動面を確保するためにフランジ部７１を有する略Ｌ字形状のスリーブ７を軸２に嵌合させた場合であっても良い。   2, a substantially L-shaped sleeve 7 having a flange portion 71 may be fitted to the shaft 2 in order to secure a sliding surface on which the pressure-reducing seal lip 57 slides. .

本発明の実施例に係る耐圧用オイルシールの断面図Sectional drawing of the pressure-resistant oil seal which concerns on the Example of this invention 本発明の別の実施例に係る耐圧用オイルシールの断面図Sectional drawing of the pressure-resistant oil seal which concerns on another Example of this invention. 従来例に係る耐圧用オイルシールの断面図Cross section of pressure-resistant oil seal according to conventional example 別の従来例に係る耐圧用オイルシールの断面図Sectional view of a pressure-resistant oil seal according to another conventional example

符号の説明Explanation of symbols

１ 耐圧用オイルシール
２ 軸（他の部材）
２２，７１Ａ 径方向端面
３ ハウジング（一の部材）
４ 金属環
４１ 円筒部
４２ フランジ部
５ シール本体部
５１ シール部
５１ａ，５１ｂ シールリップ
５２ 固定密封部
５３ 外側部
５４ 内周部
５５ 外周部
５６ 端部
５７ 減圧用シールリップ
５７Ａ 摺動面
５８ 突起
６ ガータスプリング
７ スリーブ
７１ フランジ部
Ａ 密封対象側
Ｂ 反密封対象側 1 Pressure-resistant oil seal 2 Shaft (other members)
22, 71A Radial end face 3 Housing (one member)
4 Metal ring 41 Cylindrical part 42 Flange part 5 Seal body part 51 Seal part 51a, 51b Seal lip 52 Fixed sealing part 53 Outer part 54 Inner part 55 Outer part 56 End part 57 Pressure reducing seal lip 57A Sliding surface 58 Projection 6 Garter spring 7 Sleeve 71 Flange A Side to be sealed B Side to be sealed

Claims (2)

一の部材に固定密封部を介して嵌合する金属環と、前記固定密封部と他の部材に摺動するオイルシールリップを有するシール部からなるシール本体部と、を備えた耐圧用オイルシールにおいて、
前記他の部材の径方向端面に摺動する摺動面が樹脂で楔形状のシールリップを前記固定密封部に設けたことを特徴とする耐圧用オイルシール。 A pressure-resistant oil seal comprising: a metal ring fitted to one member via a fixed sealing portion; and a seal main body portion including a seal portion having an oil seal lip that slides on the fixed sealing portion and another member. In
A pressure-resistant oil seal characterized in that a sliding surface sliding on a radial end surface of the other member is made of resin and a wedge-shaped seal lip is provided on the fixed sealing portion. 一の部材に固定密封部を介して嵌合する金属環と、前記固定密封部と他の部材に嵌合したスリンガに摺動するオイルシールリップを有するシール部からなるシール本体部と、を備えた耐圧用オイルシールにおいて、
前記スリンガのフランジ部に摺動する摺動面が樹脂で楔形状のシールリップを前記固定密封部に設けたことを特徴とする耐圧用オイルシール。 A metal ring that fits into one member via a fixed sealing portion, and a seal body that includes an oil seal lip that slides on a slinger fitted to the fixed sealing portion and the other member. In the pressure-resistant oil seal,
A pressure-resistant oil seal characterized in that a sliding surface sliding on a flange portion of the slinger is made of resin and a wedge-shaped seal lip is provided on the fixed sealing portion.
JP2004315362A 2004-10-29 2004-10-29 Pressure resistant oil seal Withdrawn JP2006125538A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009085420A (en) * 2007-10-03 2009-04-23 Nok Corp Sealing device
CN106104113A (en) * 2014-01-29 2016-11-09 彻斯特顿公司 Non-contacting labyrinth seal assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009085420A (en) * 2007-10-03 2009-04-23 Nok Corp Sealing device
CN106104113A (en) * 2014-01-29 2016-11-09 彻斯特顿公司 Non-contacting labyrinth seal assembly

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