US20060138729A1 - Reciprocating seal - Google Patents

Reciprocating seal Download PDF

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Publication number
US20060138729A1
US20060138729A1 US10/531,443 US53144305A US2006138729A1 US 20060138729 A1 US20060138729 A1 US 20060138729A1 US 53144305 A US53144305 A US 53144305A US 2006138729 A1 US2006138729 A1 US 2006138729A1
Authority
US
United States
Prior art keywords
lip
shaft
seal
reciprocating
frictional force
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US10/531,443
Other languages
English (en)
Inventor
Hidenori Arai
Kazuki Takeno
Ichiro Yamane
Shinobu Munekata
Katsumi Yamashina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nok Corp
Original Assignee
Nok Corp
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 Corp filed Critical Nok Corp
Assigned to NOK CORPORATION reassignment NOK CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKENO, KAZUKI, ARAI, HIDENORI, MUNEKATA, SHINOBU, WATANABE, MASARU, YAMASHINA, KATSUMI, YAMANE, ICHIRO
Publication of US20060138729A1 publication Critical patent/US20060138729A1/en
Priority to US12/230,708 priority Critical patent/US7918463B2/en
Abandoned legal-status Critical Current

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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
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • 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
    • F16J15/3204—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
    • F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
    • 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
    • F16J15/56—Other sealings for reciprocating rods

Definitions

  • the present invention relates to a reciprocating seal used, for example, for a shock absorber.
  • a reciprocating seal of this kind has been conventionally known that is used for a shock absorber mounted in an automobile and the like.
  • reciprocating seals according to a conventional art like this is, for example, a seal shown in FIG. 3 .
  • FIG. 3 is a schematic sectional view of a reciprocating seal according to a conventional art.
  • the reciprocating seal is arranged in an annular space between a shaft (not shown) and the inner periphery of a housing (in more detail, shaft hole made in the housing), which move relatively in the direction of the shaft, to form a sealed space.
  • a reciprocating seal 100 according to the conventional art, as shown in the drawing, is mainly provided with a metal ring 200 and a rubber seal 300 baked on the metal ring 200 .
  • the rubber seal 300 has an outer peripheral seal portion 301 mounted on the inner periphery of the housing, a main seal lip 302 brought into sliding contact with the outer peripheral surface of the shaft, and a sub-seal lip 303 similarly brought into sliding contact with the outer peripheral surface of the shaft.
  • the reciprocating seal constructed in this manner is required to improve frictional force characteristics.
  • the main seal lip 302 has a two-step lip structure including the first lip 302 a of the first step and the second lip 302 b of the second step.
  • both of the first lip 302 a and the second lip 302 b are brought into sliding contact with the surface of the shaft to stabilize the position of the main seal lip 302 .
  • the frictional force can be made uniform to improve frictional force characteristics.
  • Structures of roughening the surface of the second lip in this manner include structures of matting the surface of the lip, forming spiral screw protrusions on the surface of the lip, and forming parallel protrusions vertical to the shaft on the surface of the lip (see the above patent publication).
  • the surface of the lip is formed in random asperity.
  • the amount of leak of sealed-in fluid (which is usually oil, so descriptions will be provided below, assuming that the sealed-in fluid is oil) becomes nonuniform in whole and hence there is a possibility that the amount of leak might increase in part.
  • the object of the invention is to provide a reciprocating seal capable of improving frictional force characteristics and at the same time improving sealing performance.
  • the invention adopts the following construction.
  • a reciprocating seal that is provided in an annular space formed between a shaft and a housing, which move relatively to each other in the direction of the shaft, and has a seal lip brought into sliding contact with the surface of the shaft, wherein the seal lip has a two-step lip structure in which a plurality of protrusions extending in the direction of the shaft are formed on the surface of the lip of the second step.
  • the seal lip has the two-step lip structure and hence the position of the seal lip can be stabilized.
  • the plurality of protrusions are formed on the surface of the lip of the second step, they can prevent an increase in the frictional force.
  • the plurality of these protrusions are so constructed as to extend in the direction of the shaft and hence the protrusions do not scrape off sealed-in fluid.
  • FIG. 1 is a schematic sectional view of a reciprocating seal according to an embodiment of the invention.
  • FIG. 2 is a sectional view showing conceptually protrusions formed on the reciprocating seal according to the embodiment of the invention.
  • FIG. 3 is a schematic sectional view of a reciprocating seal according to a conventional art.
  • a reciprocating seal according to the invention will be described with reference to FIG. 1 .
  • FIG. 1 is a schematic sectional view of a reciprocating seal according to the embodiment of the invention.
  • the reciprocating seal 1 according to the embodiment of the invention can be suitably used for a shock absorber mounted in an automobile and the like.
  • the reciprocating seal 1 is arranged in an annular space between a shaft (not shown) and the inner periphery of a housing (shaft hole made in the housing, in more detail), which move relatively to each other in the direction of the shaft, to form a sealed space.
  • oil of sealed-in fluid is hermetically sealed in a hermetically sealed space formed by the reciprocating seal 1 .
  • the reciprocating seal 1 according to this embodiment is roughly provided with a metal ring 2 and a rubber seal 3 baked on the metal ring 2 .
  • the rubber seal 3 has an outer peripheral seal portion 31 mounted on the inner periphery of a housing not shown (the inner periphery of a shaft hole made in the housing), a main seal lip 32 brought into sliding contact with the outer peripheral surface of a shaft (not shown), and a sub-seal lip 33 similarly brought into sliding contact with the outer peripheral surface of the shaft.
  • a spring 4 for pressing the lip onto the surface of the shaft is provided on the outer periphery side of the main seal lip 32 .
  • the main seal lip 32 has a two-step lip structure. That is, the main seal lip 32 has the first lip 32 a of the first step located near the sealed-in fluid side and the second lip 32 b of the second step located opposite to the sealed-in fluid side.
  • the two-step lip structure is adopted and both of the first lip 32 a and the second lip 32 b are brought into sliding contact with the surface of the shaft to stabilize the position of the main seal lip 32 .
  • the distribution of frictional force can be made uniform to improve frictional force characteristics. That is, fine vibrations caused when the main seal lip 32 is brought into sliding contact with the surface of the shaft can be reduced.
  • a plurality of protrusions 34 extending in the direction of the shaft are formed on the sliding contact surface (surface of the lip opposite to the sealed-in fluid side in this embodiment) of the second lip 32 b.
  • These protrusions 34 are formed at equal intervals along the entire periphery.
  • FIG. 2 is a sectional view showing conceptually protrusions formed on the reciprocating seal according to embodiment of the invention.
  • the sectional shape of the protrusion is made triangular.
  • the height h of the protrusion is made 2 to 500 ⁇ m and, when taking elastic contact into consideration, 5 to 100 ⁇ m.
  • the interval w of the protrusions is 0.005 to 1.0 mm and, when taking elastic contact into consideration, 0.01 to 0.2 mm.
  • the vertical angle of the protrusion is 60 to 120°.
  • a more specific example of the protrusion has a height H of 0.03 mm, an interval w of 0.15 mm, a vertical angle of 90°, and a length of 1.2 mm.
  • the plurality of protrusions 34 are formed on the sliding contact surface of the second lip 32 b and hence can prevent an increase in frictional force.
  • This embodiment is so constructed as to prevent an increase in frictional force by the protrusions 34 , so that it is possible to prevent the surface of the lip from being formed in random asperity as is the case of matting the surface of the lip.
  • the plurality of protrusions 34 are so constructed as to extent in the direction of the shaft.
  • the direction in which the protrusions 34 extend agrees with the direction in which the shaft and the housing move relatively to each other, and the direction in which the main seal lip 32 moves (slides to contact) with respect to the surface of the shaft.
  • the velocity-ratio leak test is a test of measuring the amount of leak when a shaft is pushed or pulled in such a way that a pushing speed is different from a pulling speed.
  • the oil film becomes thicker in a pulling-out step (taking-out step) and becomes thinner in a pushing step.
  • the pulling-out speed in the pulling-out step was four times the pushing speed in the pushing step.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)
  • Fluid-Damping Devices (AREA)
US10/531,443 2002-10-15 2003-09-19 Reciprocating seal Abandoned US20060138729A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/230,708 US7918463B2 (en) 2002-10-15 2008-09-03 Reciprocating seal

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002300650A JP2004138091A (ja) 2002-10-15 2002-10-15 往復動シール
JP2002-300650 2002-10-15
PCT/JP2003/011995 WO2004036095A1 (ja) 2002-10-15 2003-09-19 往復動シール

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/230,708 Continuation US7918463B2 (en) 2002-10-15 2008-09-03 Reciprocating seal

Publications (1)

Publication Number Publication Date
US20060138729A1 true US20060138729A1 (en) 2006-06-29

Family

ID=32104990

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/531,443 Abandoned US20060138729A1 (en) 2002-10-15 2003-09-19 Reciprocating seal
US12/230,708 Expired - Fee Related US7918463B2 (en) 2002-10-15 2008-09-03 Reciprocating seal

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/230,708 Expired - Fee Related US7918463B2 (en) 2002-10-15 2008-09-03 Reciprocating seal

Country Status (7)

Country Link
US (2) US20060138729A1 (ja)
EP (1) EP1553335B1 (ja)
JP (1) JP2004138091A (ja)
KR (1) KR20050071545A (ja)
CN (1) CN100390445C (ja)
AU (1) AU2003264524A1 (ja)
WO (1) WO2004036095A1 (ja)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080258406A1 (en) * 2007-04-18 2008-10-23 Freudenberg-Nok General Partnership Radial Shaft Seal with Large Radial Offset Accommodation
US20080272556A1 (en) * 2004-09-24 2008-11-06 Nok Corporation Sealing device
US20080284110A1 (en) * 2007-05-15 2008-11-20 Freudenberg-Nok General Partnership Prelubricated Multi-Lipped Radial Shaft Seal With Large Radial Offset Accommodation
US20120286479A1 (en) * 2010-03-08 2012-11-15 Daikin Industries, Ltd. Vehicle engine oil seal
US20120299251A1 (en) * 2010-03-08 2012-11-29 Hidetaka Ogishi Vehicle transmission oil seal
US20120325175A1 (en) * 2010-03-08 2012-12-27 Hidetaka Ogishi Vehicle valve stem seal
US20140353925A1 (en) * 2012-02-15 2014-12-04 Eagle Industry Co., Ltd. Shaft seal device
US20150014941A1 (en) * 2012-01-23 2015-01-15 Daikin Industries, Ltd. Oil seal for automobile
US20150041473A1 (en) * 2012-03-13 2015-02-12 Daikin Industries, Ltd. Automotive filler cap
CN105782447A (zh) * 2014-12-25 2016-07-20 斯凯孚公司 轴密封件

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008101640A (ja) * 2006-10-17 2008-05-01 Nok Corp 往復動軸用密封装置
DE102007036625B4 (de) * 2007-08-02 2013-10-17 Ab Skf Dichtelement
JP2009058051A (ja) * 2007-08-31 2009-03-19 Nok Corp 往復動軸用密封装置
JP2010038328A (ja) * 2008-08-07 2010-02-18 Nok Corp 密封装置
CN101975278B (zh) * 2010-11-04 2012-12-26 重庆大学 基于磁流变橡胶与磁流变脂的自愈合密封装置及往复机构
DE102011002491A1 (de) * 2011-01-11 2012-07-12 Aktiebolaget Skf Radialwellendichtring
DE102013207029B4 (de) * 2013-04-18 2016-05-04 Aktiebolaget Skf Radialwellen-Dichtungsanordnung
CN103742651B (zh) * 2014-01-29 2016-11-16 烟台润蚨祥油封有限公司 一种低摩擦往复运动密封件
WO2014183542A1 (zh) * 2013-05-16 2014-11-20 烟台润蚨祥油封有限公司 往复运动密封件
CN105020323A (zh) * 2014-04-26 2015-11-04 烟台润蚨祥油封有限公司 一种防尘密封结构总成
CN105276066A (zh) * 2014-06-24 2016-01-27 烟台润蚨祥油封有限公司 一种减震器密封系统
US11384881B2 (en) 2016-10-20 2022-07-12 Henn Gmbh & Co Kg Plug-in coupling seal for a fluid line of a drive motor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5143385A (en) * 1988-09-09 1992-09-01 Firma Carl Freudenberg Shaft seal
US5649709A (en) * 1994-12-28 1997-07-22 Nok Corporation Shaft seal with dust sealing lip
US6029980A (en) * 1997-09-18 2000-02-29 Freudenberg-Nok General Partnership Fluid side contamination exclusion sealing lip for radial shaft seals
US6279914B1 (en) * 1997-10-24 2001-08-28 Eagle Industry Co., Ltd. Sealing apparatus
US6726211B1 (en) * 1998-06-12 2004-04-27 Nok Corporation Sealing device
US6729624B1 (en) * 2001-02-20 2004-05-04 Freudenberg-Nok General Partnership Radial shaft seal

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JPH0684067A (ja) * 1992-09-04 1994-03-25 Murata Mfg Co Ltd カップベンダー吐出ノズル
JPH0684067U (ja) * 1993-05-19 1994-12-02 株式会社荒井製作所 往復動用オイルシール
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Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5143385A (en) * 1988-09-09 1992-09-01 Firma Carl Freudenberg Shaft seal
US5649709A (en) * 1994-12-28 1997-07-22 Nok Corporation Shaft seal with dust sealing lip
US6029980A (en) * 1997-09-18 2000-02-29 Freudenberg-Nok General Partnership Fluid side contamination exclusion sealing lip for radial shaft seals
US6279914B1 (en) * 1997-10-24 2001-08-28 Eagle Industry Co., Ltd. Sealing apparatus
US6726211B1 (en) * 1998-06-12 2004-04-27 Nok Corporation Sealing device
US6729624B1 (en) * 2001-02-20 2004-05-04 Freudenberg-Nok General Partnership Radial shaft seal

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080272556A1 (en) * 2004-09-24 2008-11-06 Nok Corporation Sealing device
US20080272558A1 (en) * 2004-09-24 2008-11-06 Nok Corporation Sealing device
US20080258406A1 (en) * 2007-04-18 2008-10-23 Freudenberg-Nok General Partnership Radial Shaft Seal with Large Radial Offset Accommodation
US7887062B2 (en) * 2007-04-18 2011-02-15 Freudenberg-Nok General Partnership Radial shaft seal with large radial offset accommodation
US20080284110A1 (en) * 2007-05-15 2008-11-20 Freudenberg-Nok General Partnership Prelubricated Multi-Lipped Radial Shaft Seal With Large Radial Offset Accommodation
US7963526B2 (en) * 2007-05-15 2011-06-21 Freudenberg-Nok General Partnership Prelubricated multi-lipped radial shaft seal with large radial offset accommodation
US20120299251A1 (en) * 2010-03-08 2012-11-29 Hidetaka Ogishi Vehicle transmission oil seal
CN102792076A (zh) * 2010-03-08 2012-11-21 本田技研工业株式会社 汽车用发动机油封
US20120286479A1 (en) * 2010-03-08 2012-11-15 Daikin Industries, Ltd. Vehicle engine oil seal
US20120325175A1 (en) * 2010-03-08 2012-12-27 Hidetaka Ogishi Vehicle valve stem seal
US8931452B2 (en) * 2010-03-08 2015-01-13 Honda Motor Co., Ltd. Vehicle valve stem seal
US9322477B2 (en) * 2010-03-08 2016-04-26 Honda Motor Co., Ltd. Vehicle transmission oil seal
US9322476B2 (en) * 2010-03-08 2016-04-26 Honda Motor Co., Ltd. Vehicle engine oil seal
US20150014941A1 (en) * 2012-01-23 2015-01-15 Daikin Industries, Ltd. Oil seal for automobile
US20140353925A1 (en) * 2012-02-15 2014-12-04 Eagle Industry Co., Ltd. Shaft seal device
US9568105B2 (en) * 2012-02-15 2017-02-14 Eagle Industry Co., Ltd. Shaft seal device
US20150041473A1 (en) * 2012-03-13 2015-02-12 Daikin Industries, Ltd. Automotive filler cap
CN105782447A (zh) * 2014-12-25 2016-07-20 斯凯孚公司 轴密封件

Also Published As

Publication number Publication date
CN100390445C (zh) 2008-05-28
KR20050071545A (ko) 2005-07-07
WO2004036095A1 (ja) 2004-04-29
EP1553335A1 (en) 2005-07-13
AU2003264524A1 (en) 2004-05-04
CN1688832A (zh) 2005-10-26
EP1553335B1 (en) 2012-02-08
JP2004138091A (ja) 2004-05-13
US7918463B2 (en) 2011-04-05
EP1553335A4 (en) 2010-07-14
US20090134586A1 (en) 2009-05-28

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AS Assignment

Owner name: NOK CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ARAI, HIDENORI;TAKENO, KAZUKI;YAMANE, ICHIRO;AND OTHERS;REEL/FRAME:017242/0533;SIGNING DATES FROM 20050408 TO 20050424

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION