WO2017098985A1 - Dispositif d'étanchéité - Google Patents

Dispositif d'étanchéité Download PDF

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Publication number
WO2017098985A1
WO2017098985A1 PCT/JP2016/085676 JP2016085676W WO2017098985A1 WO 2017098985 A1 WO2017098985 A1 WO 2017098985A1 JP 2016085676 W JP2016085676 W JP 2016085676W WO 2017098985 A1 WO2017098985 A1 WO 2017098985A1
Authority
WO
WIPO (PCT)
Prior art keywords
lip
seal
peripheral side
inner peripheral
sealing device
Prior art date
Application number
PCT/JP2016/085676
Other languages
English (en)
Japanese (ja)
Inventor
潤一 野田
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
Priority to JP2017536593A priority Critical patent/JPWO2017098985A1/ja
Publication of WO2017098985A1 publication Critical patent/WO2017098985A1/fr

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Classifications

    • 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
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • 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
    • 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
    • F16J15/3268—Mounting of sealing rings
    • F16J15/3276—Mounting of sealing rings with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted

Definitions

  • the present invention relates to a sealing device that suppresses leakage of a sealing fluid inside a machine to the outside of the machine in an automobile, a general machine, an industrial machine, or the like.
  • the sealing device of the present invention is used, for example, as an oil seal for rotation that seals in-machine oil in the field of automobiles.
  • the sealing device 510 is a combination of a slinger 550 mounted on the outer periphery of the rotating shaft 530 and a lip seal member 540 mounted on the inner periphery of the shaft hole 521 of the housing 520 located on the outboard side B of the slinger 550.
  • a sealing device 510 is known.
  • the slinger 550 is made of a rigid material such as metal, and integrally includes a sleeve 551 fitted to the outer peripheral surface of the rotary shaft 530 and a seal flange 552 provided at one end of the sleeve 551.
  • a screw groove 553 is provided on the outer end surface 552a of the machine 552. The screw groove 553 exhibits a fluid pumping action by centrifugal force when the rotary shaft 530 rotates.
  • the lip seal member 540 has an attachment ring 541 fitted to the inner peripheral surface of the shaft hole 521 of the housing 520 and a rubber-like elastic body 542 attached to the attachment ring 541.
  • the body 542 is provided with a seal lip 546 that slidably contacts the outboard end surface 552a of the seal flange 552 of the slinger 550.
  • the sealing device 510 configured as described above seals the sealing fluid when the seal lip 546 is slidably in contact with the machine outer end surface 552a of the seal flange 552, and the screw groove 553 provided on the machine outer end surface 552a of the seal flange 552.
  • the rotary shaft 530 rotates, it exerts a fluid pumping action by centrifugal force and pushes the sealing fluid back to the machine interior A, so that an excellent sealing effect can be exhibited.
  • the sealing device 510 is required to be further improved in the following points.
  • the sealing lip 546 is slidably brought into contact with the machine outer end surface 552a of the seal flange 552 to seal the sealing fluid, and the thread groove 553 provided on the machine outer end surface 552a of the seal flange 552 is provided. Since the fluid pumping action by centrifugal force is exerted during rotation and the sealing fluid is pushed back to the machine interior A, an excellent sealing effect can be exhibited. However, the sealing device 510 is arranged such that the thread groove 553 intersects the lip end of the seal lip 546 as its configuration.
  • the present invention has a static leak in a sealing device in which a seal lip is slidably in contact with a seal flange and a thread groove is provided on the seal flange to exert a fluid pumping action during rotation. It is an object of the present invention to provide a sealing device that can suppress this.
  • the sealing device of the present invention is such that the sealing fluid inside the machine leaks to the outside of the machine between the housing and the rotating shaft inserted through the shaft hole provided in the housing.
  • a sealing device that seals against the seal flange that is mounted on the outer periphery of the rotating shaft, and an outer peripheral side seal lip that is mounted on the inner periphery of the shaft hole of the housing slidably contacts the rotating shaft.
  • the check lip may be opened in the outer diameter direction.
  • a sleeve fixed to the rotating shaft is formed on the inner peripheral side of the seal flange, and a minute gap is set between the outer peripheral surface of the sleeve and the inner peripheral surface of the cylindrical portion.
  • a labyrinth seal may be formed.
  • the sealing device in which the outer peripheral side seal lip and the inner peripheral side seal lip are slidably contacted with the seal flange, and the thread groove is provided in the seal flange to exert a fluid pumping action during rotation.
  • production of a stationary leak can be suppressed.
  • Sectional drawing of the principal part of the sealing device which concerns on embodiment of this invention Explanatory drawing of the thread groove with which the sealing device which concerns on embodiment of this invention is equipped. Sectional drawing of the principal part of the sealing device which concerns on other embodiment of this invention. It is a figure which shows a prior art example, (A) is principal part sectional drawing of the sealing device which concerns on a prior art example, (B) is explanatory drawing of the screw groove with which a sealing device is equipped.
  • FIG. 1 is a cross-sectional view of a main part of a sealing device 10 according to an embodiment of the present invention
  • FIG. 2 is an explanatory view of a thread groove 53 provided in the sealing device 10 according to an embodiment of the present invention.
  • the sealing device 10 includes a sealing fluid (oil) on the machine inner side (oil side) A between a housing (seal housing) 20 and a rotary shaft 30 inserted through a shaft hole 21 provided in the housing 20.
  • a sealing device (engine oil seal) 10 for sealing so as not to leak to the outside (atmosphere side) B, and a slinger 50 mounted on the outer periphery of the rotary shaft 30 and the inner periphery of the shaft hole 21 of the housing 20 It is comprised by the combination with the lip seal member 40 with which it is mounted
  • the slinger 50 is made of a rigid material such as metal and has a sleeve 51 fixed (fitted) to the outer peripheral surface of the rotary shaft 30 and a radial direction provided at one end of the sleeve 51 (the inner side A end).
  • a sleeve 51 fixed (fitted) to the outer peripheral surface of the rotary shaft 30 and a radial direction provided at one end of the sleeve 51 (the inner side A end).
  • a helical thread groove 53 is formed that exerts an action of pushing the sealing fluid back toward the outer peripheral side (machine inner side A).
  • the seal flange 52 is provided with an annular step portion 52b located in the middle in the radial direction.
  • An annular thread groove forming region 53a in which a thread groove 53 is formed is provided on the machine end face 52a of the seal flange 52, and an annular thread groove in which the thread groove 53 is not formed on the inner peripheral side thereof.
  • a non-formation region 53b is provided. Since the screw groove non-forming region 53b does not form the screw groove 53, it is provided as a flat surface perpendicular to the axial direction.
  • the lip seal member 40 is attached (vulcanized and bonded) to the mounting ring 41 made of a rigid material such as metal that is fixed (fitted) to the inner peripheral surface of the shaft hole 21 of the housing 20.
  • An outer peripheral seal portion 43 that seals between the housing 20 and the mounting ring 41 by contacting the inner peripheral surface of the shaft hole 21 of the housing 20 by the rubber-like elastic body 42.
  • An end face attaching portion 44 attached to the end face portion of the mounting ring 41 and an outer peripheral side seal lip 46 slidably contacting the machine outer end face 52a of the seal flange 52 of the slinger 50 are provided integrally.
  • a dust lip 45 is attached on the inner peripheral side of the end face adherent portion 44, and this dust lip 45 is made of fabric, but is integrally provided by the rubber-like elastic body 42. It may be.
  • an inner peripheral side seal lip 47 that is located on the inner peripheral side of the outer peripheral side seal lip 46 and that slidably contacts the machine outer end surface 52a of the seal flange 52 in the slinger 50 is provided. .
  • the inner peripheral side seal lip 47 protrudes from the end in the inner diameter direction of the rubber-like elastic body 42 toward the machine inner side A, and a cylindrical part 47a that is substantially concentric with the sleeve 51, and an inner side A of the cylindrical part 47a.
  • a check lip 47b extending obliquely outward from the end (in the outer diameter direction and toward the machine inner side A) and slidably contacting the machine outer end surface 52a of the seal flange 52; Is provided.
  • the radial thickness of the check lip 47b is set to be thinner than the radial thickness of the cylindrical portion 47a.
  • a labyrinth seal 60 that is a minute gap is formed between the inner peripheral surface of the cylindrical portion 47 a and the outer peripheral surface of the sleeve 51.
  • the outer peripheral side seal lip 46 is slidably in contact with the thread groove forming region 53a on the machine outer end surface 52a of the seal flange 52 with the outer peripheral side lip end 46a.
  • the inner peripheral side seal lip 47 has an inner peripheral side lip end 47c and is slidably in contact with a non-thread groove forming region 53b on the machine end surface 52a of the seal flange 52.
  • the sealing device 10 configured as described above slidably contacts the outer end surface 52a of the seal flange 52 of the slinger 50 with the outer peripheral lip end 46a of the outer peripheral seal lip 46 when the rotary shaft 30 rotates.
  • the slinger 50 that rotates together with the rotating shaft 30 exhibits a fluid swinging action by the seal flange 52 and a fluid pumping action by the thread groove 53. Accordingly, even if there is a sealing fluid passing between the outer peripheral side seal lip 46 and the seal flange 52, it can be pushed back to the outer peripheral side (machine inner side A), and an excellent sealing function is exhibited.
  • the space between the inner peripheral surface of the outer peripheral side seal lip 46 and the outer peripheral surface of the inner peripheral side seal lip 47 becomes negative pressure.
  • the radial thickness of the cylindrical portion 47a is set to be thicker than the radial thickness of the check lip 47b, the cylindrical portion 47a is difficult to deform.
  • the check lip 47b is easily deformed. Therefore, at the time of the negative pressure, the cylindrical portion 47a is not deformed, and only the check lip 47b opens in the outer diameter direction. Therefore, the pressure between the inner peripheral surface of the outer peripheral side seal lip 46 and the outer peripheral surface of the inner peripheral side seal lip 47 can be adjusted.
  • the inner peripheral seal lip 47 adopts the above configuration, even if the sealing fluid is accumulated in the space between the inner peripheral surface of the outer peripheral seal lip 46 and the outer peripheral surface of the inner peripheral seal lip 47.
  • the cylindrical portion 47a is deformed by the weight of the sealing fluid and does not come into contact with the sleeve 51 in the slinger 50.
  • the contact state between the check lip 47b and the outer end surface 52a of the seal flange 52 can be stabilized.
  • the sealing function by the inner peripheral lip end 47c is exhibited, and this prevents the sealing fluid from flowing out from the outer peripheral sealing lip 46 toward the dust lip 45, so that the sealing fluid passes through the dust lip 45. Leakage to the outside B can be suppressed.
  • outer peripheral side seal lip 46 and the inner peripheral side seal lip 47 of the present invention are in contact with the seal flange 52 of the slinger 50, lower torque can be realized as compared with a sealing device having a general radial lip structure. Can do.
  • the check lip 47b in the inner peripheral side seal lip 47 according to the present embodiment is thin, the sliding torque hardly increases, and the occurrence of energy loss due to the increase of the sliding torque is suppressed. be able to.
  • a labyrinth seal 60 is formed by providing a minute gap between the inner circumferential surface of the cylindrical portion 47a and the outer circumferential surface of the sleeve 51, leakage of the sealing fluid to the outside B of the machine through this gap. Intrusion of dust from the outside B can be prevented.
  • a thread groove forming region 53a is provided on the outer peripheral side of the stepped part 52b provided on the seal flange 52, and no thread groove is formed on the inner peripheral side of the stepped part 52b.
  • the region 53b is provided, the arrangement of these regions may be such that both the screw groove forming region 53a and the screw groove non-forming region 53b are provided on the outer peripheral side of the stepped portion 52b as shown in FIG. Good.
  • the check lip 47b comes into slidable contact with the non-thread groove forming region 53b provided on the outer peripheral side of the stepped portion 52b.

Landscapes

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

Abstract

La présente invention porte sur un dispositif d'étanchéité avec lequel il est possible d'empêcher une fuite statique. Pour atteindre le but susmentionné, le dispositif d'étanchéité tient de façon étanche un fluide d'étanchéité entre un boîtier et un arbre rotatif inséré à travers un trou d'arbre dans le boîtier, une lèvre d'étanchéité côté circonférence externe fixée à la circonférence interne du trou d'arbre venant en contact coulissant avec une bride d'étanchéité fixée à la circonférence externe de l'arbre rotatif ; une rainure de filetage qui produit un effet de pompage de fluide pendant la rotation de l'arbre rotatif, étant disposée sur la bride d'étanchéité ; une région dans laquelle n'est pas formée la rainure de filetage, étant définie côté circonférence interne de la rainure de filetage sur la bride d'étanchéité ; et le côté circonférence interne de la lèvre d'étanchéité côté circonférence externe comportant une partie cylindrique qui fait saillie vers le côté intérieur du dispositif par rapport à la direction axiale, et une lèvre de contrôle qui est plus mince que la partie cylindrique, la lèvre de contrôle s'étendant en diagonale vers l'extérieur depuis une section d'extrémité longitudinale de la partie cylindrique et venant en contact coulissant avec la région susmentionnée.
PCT/JP2016/085676 2015-12-08 2016-12-01 Dispositif d'étanchéité WO2017098985A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017536593A JPWO2017098985A1 (ja) 2015-12-08 2016-12-01 密封装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015239574 2015-12-08
JP2015-239574 2015-12-08

Publications (1)

Publication Number Publication Date
WO2017098985A1 true WO2017098985A1 (fr) 2017-06-15

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ID=59014108

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/085676 WO2017098985A1 (fr) 2015-12-08 2016-12-01 Dispositif d'étanchéité

Country Status (2)

Country Link
JP (1) JPWO2017098985A1 (fr)
WO (1) WO2017098985A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49105739U (fr) * 1973-01-08 1974-09-10
US4844480A (en) * 1987-12-04 1989-07-04 Ford Motor Company Pressure sensitive shaft sealing ring
JPH0378169U (fr) * 1989-11-30 1991-08-07
JP2009150417A (ja) * 2007-12-18 2009-07-09 Ntn Corp 車輪用軸受装置
JP2009197883A (ja) * 2008-02-21 2009-09-03 Ntn Corp 車輪用軸受装置
JP2014070728A (ja) * 2012-10-02 2014-04-21 Nok Corp オイルシール

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49105739U (fr) * 1973-01-08 1974-09-10
US4844480A (en) * 1987-12-04 1989-07-04 Ford Motor Company Pressure sensitive shaft sealing ring
JPH0378169U (fr) * 1989-11-30 1991-08-07
JP2009150417A (ja) * 2007-12-18 2009-07-09 Ntn Corp 車輪用軸受装置
JP2009197883A (ja) * 2008-02-21 2009-09-03 Ntn Corp 車輪用軸受装置
JP2014070728A (ja) * 2012-10-02 2014-04-21 Nok Corp オイルシール

Also Published As

Publication number Publication date
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