WO2011067990A1 - Oil seal - Google Patents
Oil seal Download PDFInfo
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- WO2011067990A1 WO2011067990A1 PCT/JP2010/068296 JP2010068296W WO2011067990A1 WO 2011067990 A1 WO2011067990 A1 WO 2011067990A1 JP 2010068296 W JP2010068296 W JP 2010068296W WO 2011067990 A1 WO2011067990 A1 WO 2011067990A1
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- WIPO (PCT)
- Prior art keywords
- coating
- seal lip
- seal
- oil seal
- lip
- Prior art date
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Classifications
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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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
Definitions
- the present invention relates to an oil seal which is a kind of sealing device.
- the oil seal of the present invention is used in the field of vehicles such as automobiles and two-wheeled vehicles, or general industrial machines, and is used, for example, as a seal for engines and crankshafts.
- the seal lip made of an elastic material such as rubber is generally sealed by contacting the mating member.
- the seal lip wears with use the contact width with the shaft increases. As a result, the sliding torque increases. Therefore, conventionally, as shown in FIG. 7, there is an oil seal 51 in which a coating 53 such as PTFE is uniformly applied to the seal lip 52 in order to reduce the friction torque between the seal lip 52 and the shaft S.
- the present invention applies the coating so that the coating gradually increases from the tip of the seal lip, thereby reducing the ratio of the coating to the contact width of the seal lip even after the wear of the seal lip has progressed.
- the purpose is to reduce the torque increase.
- the oil seal according to the present invention is configured as follows in order to solve the technical problems described above. That is, the oil seal according to claim 1 of the present invention has a seal lip made of an elastic body and a coating fixed to the seal lip, and the seal lip and the coating are simultaneously in contact with the shaft, The coating has a shape that gradually increases from the tip of the seal lip.
- the invention according to claim 2 is the oil seal according to claim 1, wherein the coating is formed by a mold.
- a coating fixing surface of the seal lip is provided with a hollow portion, and the coating is embedded in the hollow portion.
- a screw that performs a pumping action is integrally formed on the surface of the coating.
- the invention according to claim 5 is characterized in that, in the oil seal according to any one of claims 1 to 4, the seal lip is provided with a protrusion for preventing the coating from peeling off. To do.
- the ratio of the coating to the seal lip contact width gradually decreases because the coating thickness is constant and the rubber contact width increases. This is because the contact width of the coating did not increase.
- the contact width of the coating since the coating is gradually thickened from the tip of the seal lip, the contact width of the coating gradually increases as the seal lip wears, and thus the reduction in the ratio is suppressed. It is possible.
- the method for depositing the coating on the seal lip is not particularly limited.
- the vulcanization adhesion method coating is prepared in advance into a sheet shape and inserted into a rubber mold to form the seal lip. At the same time, it can be considered to adhere to the seal lip) or a mold forming method (manufacturing the seal lip in advance and injecting a coating molding material between it and the mold (including jigs)).
- the vulcanization adhesion method has a drawback that the coating thickness cannot be made very thin.
- the thickness of the coating can be reduced arbitrarily, so that the mold forming method is more suitable as the means for applying. According to the mold forming method, it is possible to integrally form a screw that performs a pumping action on the surface of the coating, thereby improving the sealing function.
- the angle between the surface of the seal lip containing the coating and the shaft decreases. It is preferable to provide a structure in which a hollow portion is provided and the coating is embedded in the hollow portion, whereby the angle formed with the shaft can be set to be substantially the same as that without the coating. Since the coating has a shape that gradually increases from the tip of the seal lip as described above, it is desirable that the shape of the embedding portion in which the coating is embedded be the same, that is, the cross-sectional arc so that it gradually becomes deeper from the tip of the seal lip. The shape or cross-sectional triangle.
- an anchor structure so that the thinly formed coating is not peeled off from the seal lip.
- a protrusion is provided on the seal lip fixing surface, and this is used as the anchor portion.
- the coating since the coating has a shape that gradually increases, wear of the seal lip increases and the width of the coating also increases. Therefore, the ratio of the coating in the sliding surface is increased. Thus, the decrease in the proportion of the contact portion of the coating in the contact width of the seal lip can be reduced, and the increase in torque can be kept low.
- the shape of the coating can be freely determined by making the coating with a mold.
- a screw shape can also be created by carving a screw shape into a jig.
- it is not necessary to have a thickness that can withstand the vulcanization molding pressure it is possible to coat thinly as compared with the case of vulcanization adhesion.
- the coating fixing surface of the seal lip is provided with a hollow portion, and the coating is embedded in the hollow portion, whereby the angle formed between the atmospheric slope and the shaft is coated. It can be kept the same as the angle in the product without.
- the screw that performs the pumping action is integrally formed on the surface of the coating, whereby the action of pushing back the sealing fluid works and the sealing function can be improved.
- the protrusion is provided on the seal lip, thereby making it difficult to peel off the coating.
- an oil seal 1 has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is.
- the seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with.
- a garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5.
- a coating 11 such as PTFE, molybdenum disulfide, or DLC is deposited so as to gradually increase from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere-side slope 5c.
- the coating 11 is applied, vulcanized, or molded so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere side slope 5c. Molded.
- the oil seal 1 having the above configuration has the following effects.
- the oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases.
- a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide
- it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm.
- Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
- the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5.
- the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
- the oil seal 1 has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is.
- the seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with.
- a garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5.
- the seal lip 5 is provided with a hollow portion 13 on the atmosphere-side inclined surface 5 c, and a coating 11 such as PTFE, molybdenum disulfide, or DLC is embedded in the hollow portion 13.
- the shape of the punching portion 13 may be a circular arc shape as shown in FIG. 2, or may be a triangular shape as shown in FIG.
- the coating 11 is applied, vulcanized, or molded so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere side slope 5c. Molded.
- the oil seal 1 having the above configuration has the following effects.
- the oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases.
- a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide
- it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm.
- Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
- the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5.
- the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
- the angle formed by the atmospheric slope and the shaft can be kept the same as the angle in the product without the coating 11.
- the oil seal 1 has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is.
- the seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with.
- a garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5.
- a coating 11 such as PTFE, molybdenum disulfide, or DLC is deposited so as to gradually increase from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere-side slope 5c. Furthermore, a screw 15 that performs a pumping action is integrally formed on the surface of the coating 11.
- the oil seal 1 having the above configuration has the following effects.
- the oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases.
- a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide
- it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm.
- Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
- the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5.
- the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
- the screw 15 that performs the pumping action is integrally formed on the surface of the coating 11, the action of pushing back the sealing fluid works and the sealing function can be improved.
- the oil seal 1 has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is.
- the seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with.
- a garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5.
- a coating 11 such as PTFE, molybdenum disulfide, or DLC is deposited so as to gradually increase from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere-side slope 5c. Further, the seal lip 5 is provided with a projection 17 for making it difficult to peel off the coating 11.
- the oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases.
- a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide
- it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm.
- Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
- the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5.
- the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
- the coating 11 can be made difficult to peel off by providing the projection 17.
- a space 21 into which the coating 11 is poured is defined using a jig 19, and then the material 25 of the coating 11 is poured into the space 21, and the atmosphere-side slope 5c is applied to the seal lip 5 with the burr 23 provided with the atmosphere-side slope 5c.
- the coating 11 is applied to the surface, and after the application, the coating 11 is cured to integrally form the seal lip 5 and the coating. The process of forming is performed.
- the thickness of the coating 11 needs to be able to withstand the vulcanization molding pressure.
- the thickness of the coating 11 is smaller than that for the vulcanization molding manufacturing method.
- the thickness can be reduced.
- the shape of the screw 15 can also be created by carving the shape of the screw 15 into the jig.
Abstract
An oil seal configured in such a manner that, even after the wear of the seal lip progresses, a reduction in the proportion of a coating occupying the contact width of the seal lip is minimized to suppress to a low level an increase in torque. An oil seal is provided with a seal lip which consists of an elastic body, and also with a coating which is affixed to the seal lip. The seal lip and the coating are adapted to make contact with the shaft at the same time, and the coating has a shape having a thickness which increases gradually from the tip of the seal lip. The coating is formed using a mold. A hollowed-out section is provided in a coating affixing surface of the seal lip, and the coating is embedded in the hollowed-out section. Screws which perform a pumping action are formed on the surface of the coating.
Description
本発明は、密封装置の一種であるオイルシールに関するものである。本発明のオイルシールは、自動車もしくは二輪車等の車両または一般産業用機械等の分野において用いられ、例えばエンジン・クランクシャフト用シール等として用いられる。
The present invention relates to an oil seal which is a kind of sealing device. The oil seal of the present invention is used in the field of vehicles such as automobiles and two-wheeled vehicles, or general industrial machines, and is used, for example, as a seal for engines and crankshafts.
オイルシールにおいては、一般に、ゴム等の弾性材料からなるシールリップが相手部材に接触することによって密封性を得ているが、使用とともにシールリップが摩耗する為、軸との接触幅が増加することで、摺動トルクが増加する。そこで、従来、図７に示すように、シールリップ５２と軸Ｓとの摩擦トルクの低減を図るため、シールリップ５２にＰＴＦＥ等のコーティング５３を均一に被着したオイルシール５１がある。
In oil seals, the seal lip made of an elastic material such as rubber is generally sealed by contacting the mating member. However, since the seal lip wears with use, the contact width with the shaft increases. As a result, the sliding torque increases. Therefore, conventionally, as shown in FIG. 7, there is an oil seal 51 in which a coating 53 such as PTFE is uniformly applied to the seal lip 52 in order to reduce the friction torque between the seal lip 52 and the shaft S.
しかし、シールリップ５２表面に均一にコーティング５３を薄く被着している為、シールリップ５２の摩耗が進むとシールリップ５２の接触幅に占めるコーティング５３の割合の低下が著しく、シールリップ５２が一定程度摩耗するとシールリップ５２が接触・摺動している面の半分程度がゴムとなり、コーティング５３によるトルク低減効果が低下するという問題点がある（特許文献１参照）。
However, since the coating 53 is uniformly and thinly applied to the surface of the seal lip 52, when the wear of the seal lip 52 progresses, the ratio of the coating 53 to the contact width of the seal lip 52 decreases significantly, and the seal lip 52 is constant. When it is worn to some extent, about half of the surface where the seal lip 52 contacts and slides becomes rubber, and there is a problem that the torque reduction effect by the coating 53 is reduced (see Patent Document 1).
本発明は以上の点に鑑みて、コーティングをシールリップ先端から徐々に厚くなるように被着することで、シールリップの摩耗が進んだ後も、シールリップの接触幅に占めるコーティングの割合の低下を軽減し、トルクの増加を低く抑えることを目的とする。
In view of the above points, the present invention applies the coating so that the coating gradually increases from the tip of the seal lip, thereby reducing the ratio of the coating to the contact width of the seal lip even after the wear of the seal lip has progressed. The purpose is to reduce the torque increase.
本発明に係るオイルシールは、前述した技術的課題を解決するために以下のように構成されている。すなわち、本発明の請求項１によるオイルシールは、弾性体からなるシールリップと前記シールリップに固定されるコーティングを有し、前記シールリップ及びコーティングは軸に対して同時に接触するものであって、前記コーティングはシールリップ先端から徐々に厚くなる形状を有することを特徴とする。
The oil seal according to the present invention is configured as follows in order to solve the technical problems described above. That is, the oil seal according to claim 1 of the present invention has a seal lip made of an elastic body and a coating fixed to the seal lip, and the seal lip and the coating are simultaneously in contact with the shaft, The coating has a shape that gradually increases from the tip of the seal lip.
また、請求項２に記載の発明は、請求項１に記載のオイルシールにおいて、前記コーティングは型にて成形されていることを特徴とする。
The invention according to claim 2 is the oil seal according to claim 1, wherein the coating is formed by a mold.
また、請求項３に記載の発明は、請求項１又は２に記載のオイルシールにおいて、前記シールリップにおけるコーティング固定面にえぐれ部が設けられ、前記コーティングは前記えぐれ部に埋め込まれていることを特徴とする。
According to a third aspect of the present invention, in the oil seal according to the first or second aspect, a coating fixing surface of the seal lip is provided with a hollow portion, and the coating is embedded in the hollow portion. Features.
また、請求項４に記載の発明は、請求項１乃至３のいずれか１項に記載のオイルシールにおいて、前記コーティングの表面にポンピング作用をなすネジが一体に成形されていることを特徴とする。
According to a fourth aspect of the present invention, in the oil seal according to any one of the first to third aspects, a screw that performs a pumping action is integrally formed on the surface of the coating. .
また、請求項５に記載の発明は、請求項１乃至４のいずれか１項に記載のオイルシールにおいて、前記シールリップに、コーティングを剥がれにくくするための突起が設けられていることを特徴とする。
The invention according to claim 5 is characterized in that, in the oil seal according to any one of claims 1 to 4, the seal lip is provided with a protrusion for preventing the coating from peeling off. To do.
上記従来技術において、シールリングの摩耗に伴って、シールリップの接触幅に占めるコーティングの割合が徐々に減少するのは、コーティングの厚みが一定とされていて、ゴムの接触幅が増大してもコーティングの接触幅が増大しなかったからである。これに対し本発明では、コーティングがシールリップ先端から徐々に厚くなる形状とされているために、シールリップの摩耗に伴ってコーティングの接触幅が徐々に増大し、よって上記割合の低減を抑制することが可能とされている。
In the above prior art, as the seal ring wears, the ratio of the coating to the seal lip contact width gradually decreases because the coating thickness is constant and the rubber contact width increases. This is because the contact width of the coating did not increase. On the other hand, in the present invention, since the coating is gradually thickened from the tip of the seal lip, the contact width of the coating gradually increases as the seal lip wears, and thus the reduction in the ratio is suppressed. It is possible.
尚、本発明において、シールリップにコーティングを被着する方法は特に限定されず、例えば加硫接着法（コーティングを予めシート状に製作し、これをゴム成形型に挿入して、シールリップの成形と同時にシールリップに接着する）や型成形法（シールリップを予め製作し、これと型（治具の類を含む）との間にコーティング成形材料を注入して成形する）などが考えられるが、加硫接着法にはコーティングの厚みをあまり薄くできない難点がある。これに対し型成形法によれば、コーティングの厚みを任意に薄くできるので、被着手段としては型成形法のほうが好適である。型成形法によれば、コーティングの表面にポンピング作用をなすネジを一体に成形することも可能となり、これによりシール機能も向上することになる。
In the present invention, the method for depositing the coating on the seal lip is not particularly limited. For example, the vulcanization adhesion method (coating is prepared in advance into a sheet shape and inserted into a rubber mold to form the seal lip. At the same time, it can be considered to adhere to the seal lip) or a mold forming method (manufacturing the seal lip in advance and injecting a coating molding material between it and the mold (including jigs)). The vulcanization adhesion method has a drawback that the coating thickness cannot be made very thin. On the other hand, according to the mold forming method, the thickness of the coating can be reduced arbitrarily, so that the mold forming method is more suitable as the means for applying. According to the mold forming method, it is possible to integrally form a screw that performs a pumping action on the surface of the coating, thereby improving the sealing function.
また、シールリップの表面にコーティングを被着すると、コーティングを含むシールリップの表面が軸とのなす角度が減少することが懸念されるが、これを解消するには、シールリップにおけるコーティング固定面にえぐれ部を設け、このえぐれ部にコーティングを埋め込む構造とするのが好適であり、これにより軸とのなす角度をコーティングなしの場合と実質同じ角度に設定することが可能となる。尚、コーティングは上記したようにシールリップ先端から徐々に厚くなる形状であるので、これを埋め込むえぐれ部の形状も同様にするのが望ましく、すなわちシールリップ先端から徐々に深くなるように断面円弧形もしくは断面三角形などとする。
In addition, there is a concern that when the coating is applied to the surface of the seal lip, the angle between the surface of the seal lip containing the coating and the shaft decreases. It is preferable to provide a structure in which a hollow portion is provided and the coating is embedded in the hollow portion, whereby the angle formed with the shaft can be set to be substantially the same as that without the coating. Since the coating has a shape that gradually increases from the tip of the seal lip as described above, it is desirable that the shape of the embedding portion in which the coating is embedded be the same, that is, the cross-sectional arc so that it gradually becomes deeper from the tip of the seal lip. The shape or cross-sectional triangle.
また、薄く成形されるコーティングがシールリップから剥がれることがないようにアンカー構造を付設することも考えられ、例えばシールリップ固定面に突起を設けて、これをアンカー部とする。
Also, it is conceivable to provide an anchor structure so that the thinly formed coating is not peeled off from the seal lip. For example, a protrusion is provided on the seal lip fixing surface, and this is used as the anchor portion.
請求項１の発明に係るオイルシールによれば、コーティングは徐々に厚くなる形状を有するので、シールリップの摩耗が進むと共にコーティングの幅も増加する為、摺動面内に占めるコーティングの割合を高く保つことができ、シールリップの接触幅に占めるコーティングの接触部の割合の低下を軽減し、トルクの増加を低く抑えることができる。
According to the oil seal of the first aspect of the present invention, since the coating has a shape that gradually increases, wear of the seal lip increases and the width of the coating also increases. Therefore, the ratio of the coating in the sliding surface is increased. Thus, the decrease in the proportion of the contact portion of the coating in the contact width of the seal lip can be reduced, and the increase in torque can be kept low.
請求項２の発明に係るオイルシールによれば、コーティングを型でつくることにより、コーティングの形状が自由に定められる。たとえば、治具にネジ形状を彫り込むことにより、ネジの形状も作成できる。また、加硫成形圧に耐えられる厚さにする必要がないため、加硫接着した場合と比べて薄くコーティングすることも可能となる。
According to the oil seal of the invention of claim 2, the shape of the coating can be freely determined by making the coating with a mold. For example, a screw shape can also be created by carving a screw shape into a jig. Further, since it is not necessary to have a thickness that can withstand the vulcanization molding pressure, it is possible to coat thinly as compared with the case of vulcanization adhesion.
請求項３の発明に係るオイルシールによれば、シールリップにおけるコーティング固定面にえぐれ部が設けられ、コーティングはえぐれ部に埋め込まれており、これにより、大気側斜面と軸とのなす角度をコーティングが無い製品における角度と同一に維持することができる。
According to the oil seal of the third aspect of the invention, the coating fixing surface of the seal lip is provided with a hollow portion, and the coating is embedded in the hollow portion, whereby the angle formed between the atmospheric slope and the shaft is coated. It can be kept the same as the angle in the product without.
請求項４の発明に係るオイルシールによれば、コーティングの表面にポンピング作用をなすネジが一体に成形されており、これにより、密封流体を押し戻す作用が働き、シール機能を向上することができる。
According to the oil seal pertaining to the invention of claim 4, the screw that performs the pumping action is integrally formed on the surface of the coating, whereby the action of pushing back the sealing fluid works and the sealing function can be improved.
請求項５の発明に係るオイルシールによれば、シールリップに突起が設けられており、これにより、コーティングを剥がれにくくすることができる。
According to the oil seal of the fifth aspect of the invention, the protrusion is provided on the seal lip, thereby making it difficult to peel off the coating.
つぎに、発明を実施するための形態を図面にしたがって説明する。
Next, modes for carrying out the invention will be described with reference to the drawings.
第一実施形態・・・図１に示すように、当該実施形態に係るオイルシール１は、金属環３に、ゴム状弾性体からなるシールリップ５、ダストリップ９が一体的に設けられたものである。金属環３に一体に加硫接着された前記シールリップ５は、先端５ａから外径側に向かって密封流体側斜面５ｂと大気側斜面５ｃを有しており、軸の周面に摺動自在に密接するゴム状弾性体である。また、シールリップ５先端５ａ近傍の外周面には、ガータースプリング７が装着されている。前記シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるようにＰＴＦＥや二硫化モリブデン、ＤＬＣなどのコーティング１１が被着されている。
First Embodiment As shown in FIG. 1, an oil seal 1 according to this embodiment has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is. The seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with. A garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5. A coating 11 such as PTFE, molybdenum disulfide, or DLC is deposited so as to gradually increase from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere-side slope 5c.
前記コーティング１１は、コーティング１１の厚さが、シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるように塗布又は加硫成形又は型にて成形されている。
The coating 11 is applied, vulcanized, or molded so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere side slope 5c. Molded.
上記構成を備えたオイルシール１は、以下の作用効果を奏する。
The oil seal 1 having the above configuration has the following effects.
オイルシール１は、使用とともにシールリップ５が摩耗する為、軸との接触幅が増加することで摺動トルクが増加する。シールリップ５先端５ａにＰＴＦＥや二硫化モリブデンなどの摩擦係数の小さいコーティング１１を被着することで摺動トルクを下げる既存技術があるが、シールリップ５表面に薄く均一に被着している為、摺動面に対するコーティング１１の接触部の割合が減少し、シールリップ５の摩耗が進むとシールリップ５の接触幅に占めるコーティング１１の割合が低下著しく、シールリップ５が０．１ｍｍ程度摩耗するとシールリップ５が接触・摺動している面の半分はゴムとなりコーティング１１によるトルク低減効果が大幅に低下する。
The oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases. Although there is an existing technology for reducing the sliding torque by applying a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide to the tip 5a of the seal lip 5, it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm. Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
そこで、コーティング１１の厚さが、シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるようにシールリップ５表面に被着することで、シールリップ５の摩耗が進むと共にコーティング１１の幅も増加する為、摺動面内に占めるコーティング１１の接触部の割合を高く保つことが可能となり、シールリップ５の摩耗が進んだ後もトルクの増加を低く抑えることが出来る。摺動面内に占めるコーティング１１の接触部の割合が変わらないようにするとなお良い。
Therefore, the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5. As the wear of the lip 5 progresses, the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
型で成形すると、加硫成形圧に耐えられる厚さにする必要がないため、より薄く成形することができる。
When molded with a mold, it is not necessary to have a thickness that can withstand the vulcanization molding pressure, so that it can be molded thinner.
第二実施形態・・・図２に示すように、当該実施形態に係るオイルシール１は、金属環３に、ゴム状弾性体からなるシールリップ５、ダストリップ９が一体的に設けられたものである。金属環３に一体に加硫接着された前記シールリップ５は、先端５ａから外径側に向かって密封流体側斜面５ｂと大気側斜面５ｃを有しており、軸の周面に摺動自在に密接するゴム状弾性体である。また、シールリップ５先端５ａ近傍の外周面には、ガータースプリング７が装着されている。前記シールリップ５大気側斜面５ｃにえぐれ部１３が設けられ、ＰＴＦＥや二硫化モリブデン、ＤＬＣなどのコーティング１１が前記えぐれ部１３にうめこまれている。前記えぐれ部１３の形状は、図２のように断面円弧形にえぐれていてもよいし、図３のように断面三角形にえぐれていてもよい。
Second Embodiment As shown in FIG. 2, the oil seal 1 according to this embodiment has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is. The seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with. A garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5. The seal lip 5 is provided with a hollow portion 13 on the atmosphere-side inclined surface 5 c, and a coating 11 such as PTFE, molybdenum disulfide, or DLC is embedded in the hollow portion 13. The shape of the punching portion 13 may be a circular arc shape as shown in FIG. 2, or may be a triangular shape as shown in FIG.
前記コーティング１１は、コーティング１１の厚さが、シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるように塗布又は加硫成形又は型にて成形されている。
The coating 11 is applied, vulcanized, or molded so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere side slope 5c. Molded.
上記構成を備えたオイルシール１は、以下の作用効果を奏する。
The oil seal 1 having the above configuration has the following effects.
オイルシール１は、使用とともにシールリップ５が摩耗する為、軸との接触幅が増加することで摺動トルクが増加する。シールリップ５先端５ａにＰＴＦＥや二硫化モリブデンなどの摩擦係数の小さいコーティング１１を被着することで摺動トルクを下げる既存技術があるが、シールリップ５表面に薄く均一に被着している為、摺動面に対するコーティング１１の接触部の割合が減少し、シールリップ５の摩耗が進むとシールリップ５の接触幅に占めるコーティング１１の割合が低下著しく、シールリップ５が０．１ｍｍ程度摩耗するとシールリップ５が接触・摺動している面の半分はゴムとなりコーティング１１によるトルク低減効果が大幅に低下する。
The oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases. Although there is an existing technology for reducing the sliding torque by applying a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide to the tip 5a of the seal lip 5, it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm. Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
そこで、コーティング１１の厚さが、シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるようにシールリップ５表面に被着することで、シールリップ５の摩耗が進むと共にコーティング１１の幅も増加する為、摺動面内に占めるコーティング１１の接触部の割合を高く保つことが可能となり、シールリップ５の摩耗が進んだ後もトルクの増加を低く抑えることが出来る。摺動面内に占めるコーティング１１の接触部の割合が変わらないようにするとなお良い。
Therefore, the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5. As the wear of the lip 5 progresses, the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
型で成形すると、加硫成形圧に耐えられる厚さにする必要がないため、より薄く成形することができる。
When molded with a mold, it is not necessary to have a thickness that can withstand the vulcanization molding pressure, so that it can be molded thinner.
上記効果に加え、えぐれ部１３を設けてコーティング１１を埋め込むことにより、大気側斜面と軸とのなす角度をコーティング１１が無い製品における角度と同一に維持することができる。
In addition to the above effects, by providing the hollow portion 13 and embedding the coating 11, the angle formed by the atmospheric slope and the shaft can be kept the same as the angle in the product without the coating 11.
第三実施形態・・・図４に示すように、当該実施形態に係るオイルシール１は、金属環３に、ゴム状弾性体からなるシールリップ５、ダストリップ９が一体的に設けられたものである。金属環３に一体に加硫接着された前記シールリップ５は、先端５ａから外径側に向かって密封流体側斜面５ｂと大気側斜面５ｃを有しており、軸の周面に摺動自在に密接するゴム状弾性体である。また、シールリップ５先端５ａ近傍の外周面には、ガータースプリング７が装着されている。前記シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるようにＰＴＦＥや二硫化モリブデン、ＤＬＣなどのコーティング１１が被着されている。さらに、コーティング１１の表面にポンピング作用をなすネジ１５が一体に成形されている。
Third Embodiment As shown in FIG. 4, the oil seal 1 according to this embodiment has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is. The seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with. A garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5. A coating 11 such as PTFE, molybdenum disulfide, or DLC is deposited so as to gradually increase from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere-side slope 5c. Furthermore, a screw 15 that performs a pumping action is integrally formed on the surface of the coating 11.
上記構成を備えたオイルシール１は、以下の作用効果を奏する。
The oil seal 1 having the above configuration has the following effects.
オイルシール１は、使用とともにシールリップ５が摩耗する為、軸との接触幅が増加することで摺動トルクが増加する。シールリップ５先端５ａにＰＴＦＥや二硫化モリブデンなどの摩擦係数の小さいコーティング１１を被着することで摺動トルクを下げる既存技術があるが、シールリップ５表面に薄く均一に被着している為、摺動面に対するコーティング１１の接触部の割合が減少し、シールリップ５の摩耗が進むとシールリップ５の接触幅に占めるコーティング１１の割合が低下著しく、シールリップ５が０．１ｍｍ程度摩耗するとシールリップ５が接触・摺動している面の半分はゴムとなりコーティング１１によるトルク低減効果が大幅に低下する。
The oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases. Although there is an existing technology for reducing the sliding torque by applying a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide to the tip 5a of the seal lip 5, it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm. Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
そこで、コーティング１１の厚さが、シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるようにシールリップ５表面に被着することで、シールリップ５の摩耗が進むと共にコーティング１１の幅も増加する為、摺動面内に占めるコーティング１１の接触部の割合を高く保つことが可能となり、シールリップ５の摩耗が進んだ後もトルクの増加を低く抑えることが出来る。摺動面内に占めるコーティング１１の接触部の割合が変わらないようにするとなお良い。
Therefore, the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5. As the wear of the lip 5 progresses, the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
型で成形すると、加硫成形圧に耐えられる厚さにする必要がないため、より薄く成形することができる。
When molded with a mold, it is not necessary to have a thickness that can withstand the vulcanization molding pressure, so that it can be molded thinner.
さらに、コーティング１１の表面にポンピング作用をなすネジ１５が一体に成形されていることにより、密封流体を押し戻す作用が働き、シール機能を向上することができる。
Furthermore, since the screw 15 that performs the pumping action is integrally formed on the surface of the coating 11, the action of pushing back the sealing fluid works and the sealing function can be improved.
第四実施形態・・・図５に示すように、当該実施形態に係るオイルシール１は、金属環３に、ゴム状弾性体からなるシールリップ５、ダストリップ９が一体的に設けられたものである。金属環３に一体に加硫接着された前記シールリップ５は、先端５ａから外径側に向かって密封流体側斜面５ｂと大気側斜面５ｃを有しており、軸の周面に摺動自在に密接するゴム状弾性体である。また、シールリップ５先端５ａ近傍の外周面には、ガータースプリング７が装着されている。前記シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるようにＰＴＦＥや二硫化モリブデン、ＤＬＣなどのコーティング１１が被着されている。さらに、前記シールリップ５に、コーティング１１を剥がれにくくするための突起１７が設けられている。
Fourth Embodiment As shown in FIG. 5, the oil seal 1 according to this embodiment has a metal ring 3 integrally provided with a seal lip 5 and a dust lip 9 made of a rubber-like elastic body. It is. The seal lip 5 integrally vulcanized and bonded to the metal ring 3 has a sealed fluid side inclined surface 5b and an atmosphere side inclined surface 5c from the tip 5a toward the outer diameter side, and is slidable on the peripheral surface of the shaft. It is a rubber-like elastic body in close contact with. A garter spring 7 is mounted on the outer peripheral surface near the tip 5a of the seal lip 5. A coating 11 such as PTFE, molybdenum disulfide, or DLC is deposited so as to gradually increase from the tip 5a of the seal lip 5 toward the outer diameter side of the seal lip 5 atmosphere-side slope 5c. Further, the seal lip 5 is provided with a projection 17 for making it difficult to peel off the coating 11.
オイルシール１は、使用とともにシールリップ５が摩耗する為、軸との接触幅が増加することで摺動トルクが増加する。シールリップ５先端５ａにＰＴＦＥや二硫化モリブデンなどの摩擦係数の小さいコーティング１１を被着することで摺動トルクを下げる既存技術があるが、シールリップ５表面に薄く均一に被着している為、摺動面に対するコーティング１１の接触部の割合が減少し、シールリップ５の摩耗が進むとシールリップ５の接触幅に占めるコーティング１１の割合が低下著しく、シールリップ５が０．１ｍｍ程度摩耗するとシールリップ５が接触・摺動している面の半分はゴムとなりコーティング１１によるトルク低減効果が大幅に低下する。
The oil seal 1 wears the seal lip 5 with use, so the sliding torque increases as the contact width with the shaft increases. Although there is an existing technology for reducing the sliding torque by applying a coating 11 having a low friction coefficient such as PTFE or molybdenum disulfide to the tip 5a of the seal lip 5, it is thinly and uniformly applied to the surface of the seal lip 5. If the ratio of the contact portion of the coating 11 with respect to the sliding surface decreases and the wear of the seal lip 5 progresses, the ratio of the coating 11 to the contact width of the seal lip 5 decreases remarkably, and the seal lip 5 wears about 0.1 mm. Half of the surface on which the seal lip 5 is in contact with and sliding is made of rubber, and the torque reduction effect of the coating 11 is greatly reduced.
そこで、コーティング１１の厚さが、シールリップ５の先端５ａから、シールリップ５大気側斜面５ｃの外径側に向けて、徐々に厚くなるようにシールリップ５表面に被着することで、シールリップ５の摩耗が進むと共にコーティング１１の幅も増加する為、摺動面内に占めるコーティング１１の接触部の割合を高く保つことが可能となり、シールリップ５の摩耗が進んだ後もトルクの増加を低く抑えることが出来る。摺動面内に占めるコーティング１１の接触部の割合が変わらないようにするとなお良い。
Therefore, the coating 11 is deposited on the surface of the seal lip 5 so that the thickness of the coating 11 gradually increases from the tip 5a of the seal lip 5 toward the outer diameter side of the inclined surface 5c of the seal lip 5. As the wear of the lip 5 progresses, the width of the coating 11 also increases, so that the ratio of the contact portion of the coating 11 in the sliding surface can be kept high, and the torque increases even after the wear of the seal lip 5 progresses. Can be kept low. More preferably, the ratio of the contact portion of the coating 11 in the sliding surface is not changed.
型で成形すると、加硫成形圧に耐えられる厚さにする必要がないため、より薄く成形することができる。
When molded with a mold, it is not necessary to have a thickness that can withstand the vulcanization molding pressure, so that it can be molded thinner.
さらに、前記突起１７を設けたことにより、コーティング１１を剥がれにくくすることができる。
Furthermore, the coating 11 can be made difficult to peel off by providing the projection 17.
次に、上記実施形態の全てについてのオイルシール１の製造方法について説明する。
Next, a method for manufacturing the oil seal 1 for all of the above embodiments will be described.
治具１９を用いてコーティング１１を流し込む空間２１を定めその後、空間２１にコーティング１１の材料２５を流し込み、大気側斜面５ｃを設けたバリ２３付きシールリップ５を被着対象として前記大気側斜面５ｃにコーティング１１を被着する工程と、被着後、前記コーティング１１を硬化させてシールリップ５とコーティングを一体形成し、形成後、メスカットラインＣによりシールリップ５先端５ａおよび密封流体側斜面５ｂを形成する工程を経る。
A space 21 into which the coating 11 is poured is defined using a jig 19, and then the material 25 of the coating 11 is poured into the space 21, and the atmosphere-side slope 5c is applied to the seal lip 5 with the burr 23 provided with the atmosphere-side slope 5c. The coating 11 is applied to the surface, and after the application, the coating 11 is cured to integrally form the seal lip 5 and the coating. The process of forming is performed.
加硫成形する製造方法では、コーティング１１の厚さは、加硫成形圧に耐えられる厚さが必要であるが、上記製造方法ならば、加硫成形する製造方法にくらべて、コーティング１１の厚さを薄くすることができる。また、治具にネジ１５形状を彫り込むことにより、ネジ１５の形状も作成できる。
In the manufacturing method for vulcanization molding, the thickness of the coating 11 needs to be able to withstand the vulcanization molding pressure. With the above manufacturing method, the thickness of the coating 11 is smaller than that for the vulcanization molding manufacturing method. The thickness can be reduced. Moreover, the shape of the screw 15 can also be created by carving the shape of the screw 15 into the jig.
１ オイルシール
３ 金属環
５ シールリップ
５ａ 先端
５ｂ 密封流体側斜面
５ｃ 大気側斜面
７ ガータースプリング
９ ダストリップ
１１ コーティング
１３ えぐれ部
１５ ネジ
１７ 突起
１９ 治具
２１ 空間
２３ バリ
２５ 材料
Ｃ メスカットライン DESCRIPTION OFSYMBOLS 1 Oil seal 3 Metal ring 5 Seal lip 5a Tip 5b Sealed fluid side slope 5c Atmosphere side slope 7 Garter spring 9 Dustrip 11 Coating 13 Peeling part 15 Screw 17 Protrusion 19 Jig 21 Space 23 Burr 25 Material C Female cut line
３ 金属環
５ シールリップ
５ａ 先端
５ｂ 密封流体側斜面
５ｃ 大気側斜面
７ ガータースプリング
９ ダストリップ
１１ コーティング
１３ えぐれ部
１５ ネジ
１７ 突起
１９ 治具
２１ 空間
２３ バリ
２５ 材料
Ｃ メスカットライン DESCRIPTION OF
Claims (5)
- 弾性体からなるシールリップと前記シールリップに固定されるコーティングを有し、前記シールリップ及びコーティングは軸に対して同時に接触するものであって、前記コーティングはシールリップ先端から徐々に厚くなる形状を有することを特徴とするオイルシール。 A seal lip made of an elastic body and a coating fixed to the seal lip, wherein the seal lip and the coating are in contact with the shaft at the same time, and the coating has a shape gradually increasing from the tip of the seal lip; An oil seal characterized by having.
- 請求項１に記載のオイルシールにおいて、
前記コーティングは型にて成形されていることを特徴とするオイルシール。 The oil seal according to claim 1,
The oil seal is characterized in that the coating is formed by a mold. - 請求項１又は２に記載のオイルシールにおいて、
前記シールリップにおけるコーティング固定面にえぐれ部が設けられ、
前記コーティングは前記えぐれ部に埋め込まれていることを特徴とするオイルシール。 In the oil seal according to claim 1 or 2,
The coating fixing surface in the seal lip is provided with a hollow portion,
The oil seal is characterized in that the coating is embedded in the punched portion. - 請求項１乃至３のいずれか１項に記載のオイルシールにおいて、
前記コーティングの表面にポンピング作用をなすネジが一体に成形されていることを特徴とするオイルシール。 The oil seal according to any one of claims 1 to 3,
An oil seal characterized in that a screw for performing a pumping action is integrally formed on the surface of the coating. - 請求項１乃至４のいずれか１項に記載のオイルシールにおいて、
前記シールリップに、コーティングを剥がれにくくするための突起が設けられていることを特徴とするオイルシール。 The oil seal according to any one of claims 1 to 4,
An oil seal characterized in that the seal lip is provided with a protrusion for making it difficult to peel off the coating.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-276469 | 2009-12-04 | ||
| JP2009276469A JP2011117554A (en) | 2009-12-04 | 2009-12-04 | Oil seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011067990A1 true WO2011067990A1 (en) | 2011-06-09 |
Family
ID=44114849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2010/068296 WO2011067990A1 (en) | 2009-12-04 | 2010-10-19 | Oil seal |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2011117554A (en) |
| WO (1) | WO2011067990A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01108459U (en) * | 1988-01-13 | 1989-07-21 | ||
| JPH0525072U (en) * | 1991-09-11 | 1993-04-02 | 光洋精工株式会社 | Oil seal |
| JP2000009235A (en) * | 1998-06-25 | 2000-01-11 | Koyo Seiko Co Ltd | Oil seal |
| JP2006292160A (en) * | 2004-08-31 | 2006-10-26 | Nok Corp | Oil seal and production method therefor |
-
2009
- 2009-12-04 JP JP2009276469A patent/JP2011117554A/en active Pending
-
2010
- 2010-10-19 WO PCT/JP2010/068296 patent/WO2011067990A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01108459U (en) * | 1988-01-13 | 1989-07-21 | ||
| JPH0525072U (en) * | 1991-09-11 | 1993-04-02 | 光洋精工株式会社 | Oil seal |
| JP2000009235A (en) * | 1998-06-25 | 2000-01-11 | Koyo Seiko Co Ltd | Oil seal |
| JP2006292160A (en) * | 2004-08-31 | 2006-10-26 | Nok Corp | Oil seal and production method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011117554A (en) | 2011-06-16 |
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