WO2011067990A1 - Joint d'étanchéité d'huile - Google Patents

Joint d'étanchéité d'huile Download PDF

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Publication number
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
Authority
WO
WIPO (PCT)
Prior art keywords
coating
seal lip
seal
oil seal
lip
Prior art date
Application number
PCT/JP2010/068296
Other languages
English (en)
Japanese (ja)
Inventor
岳洋 中川
英明 長浜谷
高行 西垣
昌幸 谷田
Original Assignee
Nok株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nok株式会社 filed Critical Nok株式会社
Publication of WO2011067990A1 publication Critical patent/WO2011067990A1/fr

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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
    • 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.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

L'invention porte sur un joint d'étanchéité d'huile qui est configuré de telle sorte, même après la progression de l'usure de la lèvre du joint, qu'une réduction de la proportion d'un revêtement qui occupe la largeur de contact de la lèvre de joint est réduite à un minimum de façon à ramener à un bas niveau un accroissement du couple. Un joint d'étanchéité d'huile est pourvu d'une lèvre de joint qui est composée d'un corps élastique et d'un revêtement qui est fixé à la lèvre de joint. La lèvre de joint et le revêtement sont conçus pour entrer en contact avec l'arbre en même temps, et la forme du revêtement présente une épaisseur qui croît progressivement à partir de la pointe de la lèvre de joint. Le revêtement est formé à l'aide d'un moule. Une section en creux est agencée dans une surface de fixation de revêtement de la lèvre de joint et le revêtement est incorporé dans la section en creux. Des filets de vis, qui assurent une action de pompage, sont formés sur la surface du revêtement.
PCT/JP2010/068296 2009-12-04 2010-10-19 Joint d'étanchéité d'huile WO2011067990A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009276469A JP2011117554A (ja) 2009-12-04 2009-12-04 オイルシール
JP2009-276469 2009-12-04

Publications (1)

Publication Number Publication Date
WO2011067990A1 true WO2011067990A1 (fr) 2011-06-09

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ID=44114849

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Application Number Title Priority Date Filing Date
PCT/JP2010/068296 WO2011067990A1 (fr) 2009-12-04 2010-10-19 Joint d'étanchéité d'huile

Country Status (2)

Country Link
JP (1) JP2011117554A (fr)
WO (1) WO2011067990A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01108459U (fr) * 1988-01-13 1989-07-21
JPH0525072U (ja) * 1991-09-11 1993-04-02 光洋精工株式会社 オイルシ−ル
JP2000009235A (ja) * 1998-06-25 2000-01-11 Koyo Seiko Co Ltd オイルシール
JP2006292160A (ja) * 2004-08-31 2006-10-26 Nok Corp オイルシールおよびその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01108459U (fr) * 1988-01-13 1989-07-21
JPH0525072U (ja) * 1991-09-11 1993-04-02 光洋精工株式会社 オイルシ−ル
JP2000009235A (ja) * 1998-06-25 2000-01-11 Koyo Seiko Co Ltd オイルシール
JP2006292160A (ja) * 2004-08-31 2006-10-26 Nok Corp オイルシールおよびその製造方法

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Publication number Publication date
JP2011117554A (ja) 2011-06-16

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