JP2006125454A

JP2006125454A - Oil seal

Info

Publication number: JP2006125454A
Application number: JP2004312016A
Authority: JP
Inventors: Takayuki Aihara; 孝行相原
Original assignee: Nok Corp
Current assignee: Nok Corp
Priority date: 2004-10-27
Filing date: 2004-10-27
Publication date: 2006-05-18

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil seal to be arranged in an annular space where a shaft is rotated in both directions, preventing splash leakage to the opposite sealed side by collecting oil to be possibly leaked from a screw portion having pumping function during rotation in opposition to the rotating direction, out of screw portions formed on the sliding face of an oil seal lip, to the opposite sealed side. <P>SOLUTION: The oil seal comprises the plurality of screw portions 65, 66 alternately provided in groups on the sliding face 64 of the oil seal lip and having specified angles of inclination to the rotating direction when the shaft is positively and reversely rotated. An auxiliary screw portion 67 having a specified angle of inclination in opposition to the rotating direction of each of the screw portions 65, 66 is provided to be paired with each of the screw portions 65, 66. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、高速両回転用に用いられ、シールリップの摺動面に設けられたねじ部のポンプ機能で漏れ出ようとする油を回収するオイルシールに関する。 The present invention relates to an oil seal that is used for both high-speed rotation and collects oil that is about to leak by a pump function of a screw portion provided on a sliding surface of a seal lip.

従来、例えば図３に示すオイルシール１０１が知られている。このオイルシール１０１は、断面略Ｌ字状の第一環状部材１０２と、第一環状部材１０２を被覆するように加硫接着しているゴム状弾性体からなるシール本体部１０３と、第一環状部材１０２の円筒部にシール本体部１０３を介して嵌合している第二環状部材１０４とを備えている。シール本体１０３は、第一環状部材１０２を被覆するように形成されている固定密封部１０５と、固定密封部１０５と一体に成形され第一環状部材１０２のフランジ部の内周端部に接着し内周方向に延びるオイルシールリップ１０６とオイルシールリップ１０６より反密封対象側Ｂに位置するサブシールリップ１０７とを有するシール部１０８とからなり、オイルシールリップ１０６のリップエッジの反対側である外周側には、ガータスプリング１０９を装着するための凹部１１０が設けられている。また、オイルシールリップ１０６の摺動面１０６Ａには、軸の正回転時および逆回転時における回転方向に対して特定の傾斜角を有するねじ部（１１１Ａ，１１１Ｂ）がそれぞれ複数本づつ群として交互に設けられている。 Conventionally, for example, an oil seal 101 shown in FIG. 3 is known. The oil seal 101 includes a first annular member 102 having a substantially L-shaped cross section, a seal main body 103 made of a rubber-like elastic body that is vulcanized and bonded so as to cover the first annular member 102, and a first annular member. And a second annular member 104 fitted to the cylindrical portion of the member 102 via the seal main body portion 103. The seal body 103 includes a fixed sealing portion 105 formed so as to cover the first annular member 102, and is bonded to the inner peripheral end of the flange portion of the first annular member 102 formed integrally with the fixed sealing portion 105. An outer periphery which is composed of an oil seal lip 106 extending in the inner peripheral direction and a seal portion 108 having a sub seal lip 107 located on the anti-sealing target side B from the oil seal lip 106, and is opposite to the lip edge of the oil seal lip 106. On the side, a recess 110 for mounting the garter spring 109 is provided. Also, the sliding surface 106A of the oil seal lip 106 has a plurality of thread portions (111A, 111B) each having a specific inclination angle with respect to the rotation direction during forward rotation and reverse rotation of the shaft. Is provided.

前記オイルシール１０１は、第一環状部材１０２の外周側に位置する図示しないハウジングと、第一環状部材１０２の内周側であってハウジングと同心であり両方向に回転する軸との間に配設され、ハウジングに対しては、固定密封部１０５を介して第一環状部材１０２の円筒部が嵌合し、軸に対しては、シール部１０８が密接に摺動するように取り付けられている。そして、オイルシールリップ１０６のリップエッジの反対側に形成されている凹部１１０に装着されたガータスプリング１０９が軸の径方向の変動に対してオイルシールリップ１０６が追随するように緊迫力を与えている。 The oil seal 101 is disposed between a housing (not shown) located on the outer peripheral side of the first annular member 102 and an inner peripheral side of the first annular member 102 and a shaft that is concentric with the housing and rotates in both directions. The cylindrical portion of the first annular member 102 is fitted to the housing via the fixed sealing portion 105, and the seal portion 108 is attached to the shaft so as to slide closely. Then, the garter spring 109 mounted in the recess 110 formed on the opposite side of the lip edge of the oil seal lip 106 applies a pressing force so that the oil seal lip 106 follows the variation in the radial direction of the shaft. Yes.

これにより、オイルシールリップ１０６が主に反密封対象側Ｂへの油の漏洩を防止し、サブリップ１０７が主に泥水等の異物の密封対象側Ａへの浸入を防止する。このとき、オイルシールリップ１０６の摺動面１０６Ａに形成された軸の正回転時における回転方向（図３における矢印α）に対し特定の傾斜角を有するねじ部（正回転用ねじ部）１１１Ａが、オイルシールリップ１０６と軸周面との間から反密封対象側Ｂに漏洩する微量の油を押し戻すように、恰もポンプ機能を果たすように作用し、これにより油が反密封対象側Ｂへ漏洩するのをより一層抑止している。 Thereby, the oil seal lip 106 mainly prevents oil leakage to the anti-sealing target side B, and the sub lip 107 mainly prevents foreign matter such as muddy water from entering the sealing target side A. At this time, there is a threaded part (positively rotating threaded part) 111A having a specific inclination angle with respect to the rotational direction (arrow α in FIG. 3) at the time of forward rotation of the shaft formed on the sliding surface 106A of the oil seal lip 106. The soot acts as a pump so as to push back a small amount of oil that leaks from the gap between the oil seal lip 106 and the shaft peripheral surface to the anti-sealing target side B, so that the oil leaks to the anti-sealing target side B. This is even more deterred.

しかし、上記オイルシールの摺動面には、図４に示す通り、逆回転時における回転方向（図４における矢印β）に対し特定の傾斜角を有するねじ部（逆回転用ねじ部）１１１Ｂ、すなわち逆回転時にポンプ機能を果たすねじ部、が複数本づつ群になって、複数本づつ群になっている正回転用ねじ部１１１Ａと交互に形成されているので、正回転時には、逆回転用ねじ部１１１Ｂはオイルシールリップ１０６と軸周面との間から反密封対象側Ｂに漏洩する油を押し戻す作用が少なくなり、逆回転用ねじ部１１１Ｂから反密封対象側Ｂに飛沫漏れが発生する可能性があった。 However, on the sliding surface of the oil seal, as shown in FIG. 4, a screw portion (reverse rotation screw portion) 111 </ b> B having a specific inclination angle with respect to the rotation direction (arrow β in FIG. 4) at the time of reverse rotation, That is, since the screw portions that perform the pump function during reverse rotation are formed in groups of multiples and are alternately formed with the forward rotation screw units 111A that are in groups of multiples, during reverse rotation, The screw portion 111B has less action of pushing back oil leaking from the oil seal lip 106 and the shaft peripheral surface to the anti-sealing target side B, and splash leakage occurs from the reverse rotation screw portion 111B to the anti-sealing target side B. There was a possibility.

なお、下記特許文献には、ねじ部の長さを回転方向後方ほど長くして前方のねじ部で捕捉できなかった油を後方のねじ部で補足できるようにし、漏れ出ようとする油を捕捉する効率を高めることが提案されているが、逆回転用ねじ部より反密封対象側に飛沫漏れが発生することについての対策は、何ら開示されていなかった。 In addition, in the following patent document, the length of the screw part is made longer toward the rear in the rotation direction so that the oil that could not be caught by the front screw part can be captured by the rear screw part, and the oil that is about to leak is caught. Although it has been proposed to increase the efficiency of splashing, no countermeasure has been disclosed for the occurrence of splash leakage from the reverse rotation screw portion to the anti-sealing target side.

特開平０１−３１２２７４号公報Japanese Unexamined Patent Publication No. 01-31274

本発明は以上の点に鑑みて、軸が両方向に回転する環状空間に配置されるオイルシールであって、オイルシールリップの摺動面に形成されたねじ部のうち、回転方向に対し反対回転時にポンプ機能を有するように形成されたねじ部から反密封対象側に漏れ出ようとする油を回収し、反密封対象側に飛沫漏れが発生しない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 is an oil seal that is disposed in an annular space in which a shaft rotates in both directions, and of the screw portion formed on the sliding surface of the oil seal lip, the rotation is opposite to the rotation direction. An object of the present invention is to provide an oil seal that collects oil that tends to leak to the anti-sealing target side from a screw portion that is sometimes formed to have a pump function and does not cause splash leakage on the anti-sealing target side.

上記目的を達成するため、本発明の請求項１に係るオイルシールは、一の部材に嵌合する第一環状部材に接着し他の部材と密接に摺動するオイルシールリップの反密封対象側傾斜面に、前記他の部材の正回転時および逆回転時における回転方向に対し特定の傾斜角を有するねじ部をそれぞれ複数本づつ群として交互に設けたオイルシールにおいて、前記各ねじ部が設けられた回転方向と反対回転方向に対し特定の傾斜角を有する補助ねじ部を前記各ねじ部と対になるように設けたことを特徴とするものである。 To achieve the above object, an oil seal according to claim 1 of the present invention is an anti-sealing target side of an oil seal lip that adheres to a first annular member fitted to one member and slides closely with another member. In the oil seal in which a plurality of screw portions each having a specific inclination angle with respect to the rotation direction at the time of forward rotation and reverse rotation of the other member are alternately provided on the inclined surface as a group, each screw portion is provided. An auxiliary screw portion having a specific inclination angle with respect to the rotation direction opposite to the rotation direction is provided so as to be paired with each screw portion.

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オイルシールにおいては、シールリップの大気側傾斜面に正回転時および逆回転時における回転方向に対し特定の傾斜角を有するねじ部のほかに、該ねじ部が設けられた回転方向と反対回転方向に対し特定の傾斜角を有する補助ねじ部が対になるように形成されているので、回転方向に対し反対回転時にポンプ機能を有するように形成されたねじ部から反密封対象側に漏れ出ようとする油を補助ねじ部で回収することができ、反密封対象側に飛沫漏れが発生するのを防止することができる。 That is, in the oil seal of the present invention having the above-described configuration, in addition to the screw portion having a specific inclination angle with respect to the rotation direction at the time of forward rotation and reverse rotation on the atmosphere-side inclined surface of the seal lip, the screw portion Since the auxiliary screw portion having a specific inclination angle with respect to the rotation direction opposite to the rotation direction provided with is formed to be a pair, the screw formed to have a pump function at the time of rotation opposite to the rotation direction The oil that is about to leak from the portion to the anti-sealing target side can be collected by the auxiliary screw portion, and the occurrence of splash leakage on the anti-sealing target side can be prevented.

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オイルシール１の要部断面を示しており、図２は、図１におけるＸ部の拡大説明図であり、以下のように構成されている。 FIG. 1 shows a cross section of a main part of an oil seal 1 according to an embodiment of the present invention, and FIG. 2 is an enlarged explanatory view of a portion X in FIG. 1, which is configured as follows.

このオイルシール１は、第一環状部材２と、第二環状部材３と、シール本体部４と、を備えている。 The oil seal 1 includes a first annular member 2, a second annular member 3, and a seal body 4.

第一環状部材２は、後述する固定密封部５の外周部５１を介してハウジングに嵌合している円筒部２１と、円筒部２１の反密封対象側Ｂの端部から内径方向に延びるフランジ部２２とからなる。 The first annular member 2 includes a cylindrical portion 21 fitted into the housing via an outer peripheral portion 51 of the fixed sealing portion 5 described later, and a flange extending in the inner diameter direction from an end portion of the cylindrical portion 21 on the anti-sealing target side B Part 22.

第二環状部材３は、固定密封部５の内周部５２を介して嵌合している円筒部３１と、円筒部３１の密封対象側Ａの端部から内径方向に延びるフランジ部３２とからなる。 The second annular member 3 includes a cylindrical part 31 fitted through the inner peripheral part 52 of the fixed sealing part 5 and a flange part 32 extending in the inner diameter direction from the end of the cylindrical part 31 on the sealing target side A. Become.

シール本体部４は、第一環状部材２を被覆するように加硫接着している固定密封部５と、固定密封部５と一体に成形加硫されているシール部６とからなる。固定密封部５は、第一環状部材２の円筒部２１の外周側に位置しハウジングに密接する外周部５１と、円筒部２１の内周側に位置する内周部５２とからなる。 The seal body 4 includes a fixed sealing portion 5 that is vulcanized and bonded so as to cover the first annular member 2, and a seal portion 6 that is molded and vulcanized integrally with the fixed sealing portion 5. The fixed sealing part 5 includes an outer peripheral part 51 positioned on the outer peripheral side of the cylindrical part 21 of the first annular member 2 and in close contact with the housing, and an inner peripheral part 52 positioned on the inner peripheral side of the cylindrical part 21.

シール部６は、第一環状部材２のフランジ部２２の内径端部に接着し密封対象側Ａに延びるオイルシールリップ６１と、オイルシールリップ６１より反密封対象側Ｂに位置するサブシールリップ６２とからなり、オイルシールリップ６１のリップエッジの外周側には、径方向の変動に対してオイルシールリップ６１が追随できるように緊迫力を与えるガータスプリング７を装着するための凹部６３が形成されている。 The seal portion 6 is bonded to the inner diameter end portion of the flange portion 22 of the first annular member 2 and extends to the sealing target side A, and the sub seal lip 62 positioned on the anti-sealing target side B from the oil seal lip 61. On the outer peripheral side of the lip edge of the oil seal lip 61, there is formed a recess 63 for mounting a garter spring 7 that gives a pressing force so that the oil seal lip 61 can follow the variation in the radial direction. ing.

オイルシールリップ６１の反密封対象側Ｂ傾斜面である摺動面６４には、軸の正回転時における回転方向（図１における矢印α）に対し密封対象流体を密封対象側Ａへ押し戻す角度をなすような特定の傾斜角を有する正回転用ねじ部６５と、逆回転時の回転方向（図１における矢印β）に対し密封対象流体を密封対象側Ａへ押し戻す角度をなすような特定の傾斜角を有する逆回転用ねじ部６６がそれぞれ複数本（本実施例では３本）づつ群となって、交互に設けられている。更に、図２に示すように、逆回転用ねじ部６６の近傍には、逆回転用ねじ部６６が設けられた回転方向（図２における矢印β）と反対回転方向（図２における矢印α）に対し密封対象流体を密封対象側Ａへ押し戻す角度をなすような特定の傾斜角を有する補助ねじ部６７が、逆回転用ねじ部６６と向き合うように（逆回転用ねじ部６６と補助ねじ部６７の先端部が近づくように）逆回転ねじ部６６毎に対となって設けられている。この場合における、補助ねじ部６７の長さは、対となっている逆回転用ねじ部６６の長さより短く設定されている。 The sliding surface 64, which is the anti-sealing target side B inclined surface of the oil seal lip 61, has an angle at which the sealing target fluid is pushed back to the sealing target side A with respect to the rotation direction (arrow α in FIG. 1) when the shaft rotates forward. A forward rotation screw portion 65 having a specific inclination angle, and a specific inclination that forms an angle to push the sealing target fluid back to the sealing target side A with respect to the rotation direction (arrow β in FIG. 1) during reverse rotation. The reverse rotation screw portions 66 having corners are alternately provided in groups of three (three in this embodiment). Further, as shown in FIG. 2, in the vicinity of the reverse rotation screw portion 66, the reverse rotation direction (arrow α in FIG. 2) opposite to the rotation direction in which the reverse rotation screw portion 66 is provided (arrow β in FIG. 2). In contrast, the auxiliary screw portion 67 having a specific inclination angle that makes an angle to push the fluid to be sealed back to the sealing target side A faces the reverse rotation screw portion 66 (the reverse rotation screw portion 66 and the auxiliary screw portion). 67 so that the tip end portion of 67 is closer). In this case, the length of the auxiliary screw portion 67 is set to be shorter than the length of the reverse rotation screw portion 66 as a pair.

上記説明においては、補助ねじ部６７は、逆回転用ねじ部６６に対して設けられている場合についてのみ説明したが、正回転用ねじ部６５に対しても同じように補助ねじ部６７が、正回転用ねじ部６５毎に対となって向き合うように設けられている。 In the above description, the auxiliary screw portion 67 has been described only for the case where the auxiliary screw portion 67 is provided for the reverse rotation screw portion 66, but the auxiliary screw portion 67 is similarly applied to the forward rotation screw portion 65. The positive rotation screw portions 65 are provided so as to face each other in pairs.

なお、補助ねじ部６７の密封対象流体を密封流体側へ押し戻すような特定の傾斜角については、特に限定されるものではなく漏れ出ようとする油を回収することができる範囲内で適宜選択され、正回転用ねじ部および逆回転用ねじが設けられた特定の傾斜角と同一であることを問わない。 Note that the specific inclination angle that pushes back the fluid to be sealed in the auxiliary screw portion 67 back to the sealed fluid side is not particularly limited, and is appropriately selected within a range in which oil to be leaked can be recovered. It does not matter if it is the same as the specific inclination angle at which the forward rotation screw portion and the reverse rotation screw are provided.

上記オイルシール１は、相対動するハウジングと、ハウジングと同心で両回転する軸との間の環状空間に配設され、ハウジングに対しては、固定密封部５の外周部５１を介して第一環状部材２の円筒部２１が嵌合し、軸に対しては、オイルシールリップ６１とサブシールリップ６２が密接に摺動するようになっているので、軸の周面を伝わって反密封対象側Ｂに漏れ出ようとする油は、オイルシールリップ６１により主にシールされる。 The oil seal 1 is disposed in an annular space between a housing that moves relative to each other and a shaft that rotates concentrically with the housing. The cylindrical portion 21 of the annular member 2 is fitted, and the oil seal lip 61 and the sub seal lip 62 slide closely against the shaft. The oil that is about to leak to the side B is mainly sealed by the oil seal lip 61.

特に、オイルシールリップ６１の摺動面６４には、密封対象流体を密封対象側Ａへ押し戻す角度をなすような特定の傾斜角を有する正回転用のねじ部６５と逆回転用のねじ部６６が複数本づつ群になって交互に設けられていると共に、それらと向かい合うように密封対象流体を密封対象側Ａへ押し戻す角度をなすような特定の傾斜角を有する補助ねじ部６７が設けられているので、正回転時には、正回転用ねじ部６５が反密封対象側に漏れ出ようとする油を押し戻すようにポンプ機能を果たし、更に逆回転用ねじ部６６から漏れ出ようとする油は、逆回転用ねじ部６６と対になって設けられている補助ねじ部６７で回収されて押し戻されるので、反密封対象側Ｂへの飛沫漏れを防止することが可能となる。また、これとは反対に逆回転時には、逆回転用ねじ部６６と、正回転用ねじ部６５毎に対になって設けられている補助ねじ部６７とが漏れ出ようとする油を回収するので、反密封対象側Ｂへの飛沫漏れを防止することが可能となる。 In particular, the sliding surface 64 of the oil seal lip 61 has a forward rotation screw portion 65 and a reverse rotation screw portion 66 having a specific inclination angle that makes an angle to push the fluid to be sealed back to the seal target side A. Are provided alternately in groups of a plurality, and an auxiliary screw portion 67 having a specific inclination angle that forms an angle to push the fluid to be sealed back to the sealing target side A so as to face each other is provided. Therefore, at the time of forward rotation, the forward rotation screw portion 65 performs a pump function so as to push back the oil that is about to leak to the anti-sealing target side, and the oil about to leak from the reverse rotation screw portion 66 is Since the auxiliary screw portion 67 provided in a pair with the reverse rotation screw portion 66 is collected and pushed back, it is possible to prevent splash leakage to the anti-sealing target side B. On the contrary, at the time of reverse rotation, the reverse rotation screw portion 66 and the auxiliary screw portion 67 provided in a pair for each of the forward rotation screw portions 65 collect oil that is about to leak. Therefore, it is possible to prevent splash leakage to the anti-sealing target side B.

本発明に係るオイルシールの一部断面図Partial sectional view of an oil seal according to the present invention 図１におけるＸ部の拡大説明図Expansion explanatory drawing of the X section in FIG. 従来例に係るオイルシールの一部断面図Partial sectional view of an oil seal according to a conventional example 図３におけるＸ部の拡大説明図Expansion explanatory drawing of the X section in FIG.

符号の説明Explanation of symbols

１オイルシール
２第一環状部材
２１，３１円筒部
２２，３２フランジ部
３第二環状部材
４シール本体部
５固定密接部
６シール部
６１オイルシールリップ
６２サブシールリップ
６３凹部
６４摺動面（反密封対象側傾斜面）
６５，６６ねじ部
６７補助ねじ部
７ガータスプリング
α，β 回転方向
Ａ密封対象側
Ｂ反密封対象側 DESCRIPTION OF SYMBOLS 1 Oil seal 2 First annular member 21, 31 Cylindrical part 22, 32 Flange part 3 Second annular member 4 Seal main body part 5 Fixed close contact part 6 Seal part 61 Oil seal lip 62 Sub seal lip 63 Concave part 64 Sliding surface Sealed side inclined surface)
65, 66 Screw part 67 Auxiliary screw part 7 Garter spring α, β Rotation direction A Sealing target side B Anti-seal target side

Claims

一の部材に嵌合する第一環状部材に接着し他の部材と密接に摺動するオイルシールリップの反密封対象側傾斜面に、前記他の部材の正回転時および逆回転時における回転方向に対し特定の傾斜角を有するねじ部をそれぞれ複数本づつ群として交互に設けたオイルシールにおいて、
前記各ねじ部が設けられた回転方向と反対回転方向に対し特定の傾斜角を有する補助ねじ部を前記各ねじ部と対になるように設けたことを特徴とするオイルシール。 The direction of rotation when the other member rotates forward and backward on the inclined surface on the anti-sealing target side of the oil seal lip that adheres to the first annular member fitted to the one member and slides closely with the other member In the oil seal in which a plurality of screw portions each having a specific inclination angle are alternately provided as a group,
An oil seal, wherein an auxiliary screw portion having a specific inclination angle with respect to a rotation direction opposite to a rotation direction in which each screw portion is provided is provided to be paired with each screw portion.