WO2010090754A2 - Ensemble d'étanchéité pour arbre rotatif - Google Patents

Ensemble d'étanchéité pour arbre rotatif Download PDF

Info

Publication number
WO2010090754A2
WO2010090754A2 PCT/US2010/000338 US2010000338W WO2010090754A2 WO 2010090754 A2 WO2010090754 A2 WO 2010090754A2 US 2010000338 W US2010000338 W US 2010000338W WO 2010090754 A2 WO2010090754 A2 WO 2010090754A2
Authority
WO
WIPO (PCT)
Prior art keywords
base member
seal
axial
seal assembly
recited
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.)
Ceased
Application number
PCT/US2010/000338
Other languages
English (en)
Other versions
WO2010090754A3 (fr
Inventor
Martin W. Wiberg
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.)
SKF USA Inc
Original Assignee
SKF USA Inc
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 SKF USA Inc filed Critical SKF USA Inc
Publication of WO2010090754A2 publication Critical patent/WO2010090754A2/fr
Publication of WO2010090754A3 publication Critical patent/WO2010090754A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F16J15/3216—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction parallel to the surfaces
    • 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
    • F16J15/166—Sealings between relatively-moving surfaces with means to prevent the extrusion of the packing

Definitions

  • the present invention relates to seals, and more particularly to seals for sealing the space about a rotatable shaft.
  • seal for sealing the space about a shaft is typically referred to as a "lip seal" and includes an annular polymeric seal body having an inner surface that seals against the outer surface of the shaft.
  • a metallic base member is generally provided to retain the seal body about the shaft, typically within a housing.
  • the present invention is a seal assembly for a shaft rotatable about an axis, the shaft having an outer circumferential surface and being at least partially disposed within a housing having an inner circumferential surface defining a bore.
  • the seal assembly comprises a generally annular base member having an outer circumferential surface and a central opening, the central opening being configured to receive the shaft with clearance, the base member being sized such that the base outer surface is engageable with the housing inner surface so as to form an interference fit to fixedly retain the seal assembly with respect to the axis.
  • a generally annular seal member is disposed on the base member and having an inner circumferential sealing surface configured to seal against the shaft outer surface and an outer circumferential sealing surface configured to seal against the housing inner surface.
  • a support member includes a one-piece, generally annular body disposed generally between the seal member sealing surface and a portion of the base member, the support member being configured to at least reduce axial deflection of the sealing member.
  • the present invention is a method of forming a seal assembly comprising the steps of: providing a base member, the base member having an inner Express Mail Label No. EH 521307719 US
  • a support member including a one-piece, generally annular body; molding a seal member onto the base member so as to form a radial lip sealing engageable with a shaft and a generally annular groove located between the lip and the base member; inserting the support member through the base member central opening; and positioning the support member into the seal member groove.
  • Fig. 1 is an axial cross-section of a seal assembly of the present invention, shown in a horizontal orientation and installed about a shaft in a housing;
  • Fig. 2 is another cross-sectional view of the seal assembly, shown in a horizontal orientation and with a seal member in an uncompressed state;
  • Fig. 3 is an enlarged, broken-away axial cross-sectional view of a portion of Fig. 1, shown in a vertical orientation
  • Fig. 4 is an enlarged, broken-away axial cross-sectional view of a portion of Fig. 2, shown in a vertical orientation;
  • Fig. 5 is an axial cross-sectional view of a base member
  • Fig. 6 is an enlarged, broken-away view of a portion of Fig. 5
  • Fig. 7 is an axial cross-sectional view of a seal member
  • Fig. 8 is an enlarged, broken-away view of a portion of Fig. 7;
  • Fig. 9 is another axial cross-sectional view of the seal assembly in an unassembled state, showing a support member during installation into the seal assembly;
  • Fig. 10 is a more diagrammatic view of the seal assembly installed on a steering input shaft.
  • the shaft 1 is rotatable about a central axis A R , has an outer circumferential surface Ia, and is at least partially disposed within a housing 2 having an inner circumferential surface 2a defining a bore 3.
  • the seal assembly 10 basically comprises a generally annular base member 12, a generally annular seal member 14 disposed on the base member 12, and a support member 16.
  • the base member 12 has an outer circumferential surface 13 and a central opening O B , the central opening O B being configured to receive the shaft 1 with clearance.
  • the base member 12 is sized such that the base member outer surface 13 is engageable with the housing inner surface so as to form an interference fit I f to fixedly retain the seal assembly 10 with respect to the axis A R .
  • the seal member 14 has an inner circumferential sealing surface 15 configured to seal against the shaft outer surface Ia and an outer circumferential sealing surface 17 configured to seal against the housing inner surface 2a.
  • the support member 16 includes a one-piece, generally annular body 18 disposed generally between the seal member inner sealing surface 15 and a portion of the base member
  • the support member 16 is configured to at least reduce, and preferably substantially prevent, axial deflection of the sealing member 14, as described in further detail below.
  • the base member 12 is configured to generally axially retain the seal member 14, and the support member 16, when a fluid Fi exerts pressure P greater than two thousand pounds per square inch (2000 psi) on the seal member 14, as depicted in Fig. 1 and described further below.
  • the base member 12 is formed with a Express Mail Label No. EH 521307719 US
  • the base member 12 preferably has an axial thickness I A (Fig. 6) of sufficient magnitude so as to substantially prevent cantilever bending of a radial portion 26 of the base member 12 in a high pressure environment, which is also described in detail below.
  • the seal assembly 12 preferably further comprises an annular retainer 20, preferably a "snap ring", engageable with the housing 2 and disposeable against a generally radial end surface 22 of the base member 12.
  • the snap ring 20 prevents displacement of the seal assembly 10 in a first direction Di along the axis A R .
  • the housing 2 includes an annular groove 4 extending radially outwardly into the inner surface 2a and the snap ring 20 has an outer portion 20a disposed within the groove 4 and an inner portion 20b disposed against the base member 12.
  • the base member 12 has an edge surface 23 (Fig.
  • the base member 12 is preferably formed of a metallic material and includes a generally axial portion 24 and a generally radial portion 26 extending inwardly from the axial portion 24, the radial and axial portions 24, 26 bounding an open cavity C B (see Fig. 5) configured to receive at least a portion of the seal member 14. More specifically, the base member axial portion 24 has first and second axial ends 24a, 24b, respectively, and an inner circumferential, axial retention surface 25 extending between the first end and the base member radial portion 26. The base member radial portion 26 is disposed generally adjacent to the axial portion second axial end 24b and has an outer end 26a connected with the axial portion Express Mail Label No. EH 521307719 US
  • the base member radial portion 26 has an inner circumferential surface 28 on the inner end 26b that defines the base member central opening O B (Fig. 5), as discussed above and in further detail below.
  • the base member radial portion 26 has an axial thickness I A of sufficient magnitude so as to substantially prevent bending of the radial portion 26 with respect to the axial portion 24 when a fluid Fi exerts pressure P greater than two thousand pounds per square inch (2000 psi) on the seal member 14.
  • the resultant force f R (Fig. 4) exerted on the base member 12 (i.e., through the seal member 14 and support member 16) causes the radial portion 26 to behave as a cantilever beam.
  • a sufficient axial thickness t A prevents the force f R from bending or deflecting the radial portion 26 axially away in a direction D 1 generally away from the high pressure fluid F 1 .
  • the axial thickness t A of the base member radial portion 26 has a magnitude or value of at least about thirty-four thousands of an inch (0.036"), but such a thickness t A will vary depending on the specific application of the seal assembly 10.
  • the base member axial portion 24 has a radial thickness t R varying from a minimum value t Rmn proximal to the first axial end 24a and a maximum value t Rmax proximal to the second axial end 24b, as indicated in Fig. 6.
  • the radial thickness t R has a minimum value of about one hundred ten thousands of an inch (0.110”) and a maximum value of about two-hundred forty-five thousands of an inch (0.245”), but the particular thickness ranges will depend on the specific seal application.
  • Such a varying radial thickness t R provides a cavity C B with sufficient space for containing the seal member 14 and reinforces the cantilever-like radial portion 26, while also providing sufficient structural integrity to engage in a heavy interference fit I f without failure, as discussed above. Also, with this varying radial thickness t A , the axial retention surface 25 is generally angled and faces generally in a second axial direction Express Mail Label No. EH 521307719 US
  • the seal member 14 has first and second axial ends 14a, 14b and is located within the base member cavity C B such that at least a portion of the seal member second axial end 14b is disposed against the base member 12, specifically against the radial retention surface 27.
  • the inner circumferential sealing surface 15 is configured to substantially prevent fluid flow between the seal member 14 and the outer surface Ia of the rotating shaft 1 when the seal member first end 14a is exposed to a high pressure fluid F 1 .
  • the seal assembly 10 is utilized in an application in which the seal member first end 14a is exposeable to a high pressure fluid Fi, e.g., pressurized oil, while the seal member second end 14b is exposeable to a low pressure fluid F 2 , such as atmospheric air.
  • the seal member 14 preferably further includes a generally radially-inwardly extending dust lip 30 spaced axially from the inner circumferential sealing surface 15 and having an inner end 30a, the dust lip inner end 30a being either engageable with the shaft outer surface Ia or disposeable generally adjacent to the shaft outer surface Ia.
  • a dust lip 30 functions to prevent entry of dust or other contaminants within the low pressure fluid F 2 from entering the interface between the inner sealing surface 15 and the rotating shaft 1.
  • seal member 14 is formed as a complex-shaped, generally annular body fabricated of an elastomeric material and including a central portion 32 disposed on the base 12 and inner and outer sealing arms 34, 36, respectively.
  • the central portion 32 is substantially contained within the base member open cavity C B and is disposed against the base member retention surfaces 25, 27.
  • the dust lip 30 is preferably connected with the central portion 32 by a relatively thin, L-shaped connective portion 31 extending along the base member inner circumferential surface 28 and radial surface 27.
  • the inner sealing arm 34 extends both axially and radially inwardly from the central portion 32 and provides the inner circumferential sealing surface 15.
  • the outer sealing arm 36 extends axially and radially outwardly from the central portion 32, provides the outer sealing surface 17, and is spaced radially outwardly from the inner arm 34, i.e., the outer sealing arm 36 extends generally coaxially about the inner arm 34.
  • the outer arm 36 preferably has a radial surface 37 disposed against the base member first axial end 24a and is preferably formed such that the outer circumferential surface 17 is generally radially aligned with, and axially spaced from, the base member outer Express Mail Label No. EH 521307719 US
  • each of the inner and outer sealing arms 34, 36 is deflectable in radial directions with respect the central portion, and are both generally angled generally away from each other so as to respectively engage with the shaft 1 and the housing 2.
  • the seal assembly 10 further comprises an annular "garter” spring 40 disposed about the inner sealing arm 34 and configured to bias the inner arm 34 radially inwardly against the shaft inner surface Ia so as to increase the sealing pressure on the shaft 1.
  • the inner sealing arm 34 preferably includes at least one and preferably a plurality of annular projections or "beads" 42 each extending radially inwardly from a remainder of the inner sealing arm 24 and providing, either singly if one bead or collectively if multiple beads, the inner circumferential sealing surface 15.
  • the inner sealing arm 34 includes a primary sealing bead 44 and multiple secondary sealing beads 45, the primary bead 44 extending radially inwardly a greater distance in an unassembled state, as shown in Figs. 2, 3, 5 and 6, so as to generate a greater sealing pressure (in comparison with the secondary beads 45) when the seal assembly 10 is mounted on the shaft 1.
  • the seal member 14 also preferably includes an annular groove 46 configured to receive the support member 16; specifically, the groove 46 is preferably defined between the seal member central portion 32 and the inner sealing arm 32 and is partially bounded by the radial portion 26 of the base member 12.
  • the support member 16 is located at least partially within the seal member groove 46 so as to be disposed axially adjacent to and generally against the inner sealing arm 34, so as to thereby "reinforce" the sealing arm 34 against deflection in the first axial direction Di, and is discussed in greater detail below.
  • the annular body 18 of the support member 16 is preferably formed as a solid, generally circular ring 50 that is unbroken or continuous about its circumference and having first and second axial ends 50a, 50b.
  • the support member first axial end 50a is preferably disposed generally axially adjacent to and against the inner sealing arm 34 and the support member second axial end 50b is disposed generally against the base member 12, specifically against the base member radial portion 26 through mutual contact with the thin seal member connective portion 31, as best shown in Fig. 3.
  • the support member 16 is configured to prevent, or at least substantially reduce, deflection of the inner sealing arm 34 in Express Mail Label No. EH 521307719 US
  • the support member 16 is preferably fabricated of a polymeric material, most preferably Nylon, and as such has a higher stiffness than the elastomeric seal member 14.
  • the seal member 16 is preferably at least partially radially-inwardly deflectable or collapsible so as to be insertable through the base member central opening O B during assembly into the seal member 14. More specifically, the seal assembly 10 is preferably fabricated by forming the base member 12 of a metallic material by any appropriate means (e.g., forging, casting, stamping, etc.) and then molding the elastomeric seal member 14 to the metallic base member 12. The polymeric support member 16 is formed in a separate process (e.g., injection molding) and is then assembled into the molded seal member 14, as follows. The solid or one-piece support member ring 50 is deflected inwardly or partially collapsed and inserted through the base member opening O B (Fig.
  • the seal assembly of the present invention has a number of advantages over prior art seal assemblies that included a "split" support ring having an axially-extending gap (not shown), as has been used in seal assemblies for axially or linearly displacing shafts.
  • Such prior art rings have the tendency to become dislodged from a desired location (e.g., a groove) during shipping, handling or final assembly onto a shaft and also enable extrusion of portions of the seal into the ring axial gap during use.
  • a desired location e.g., a groove
  • the ring 50 has no tendency to dislodge from the annular groove 46 and has no gap for promoting extrusion of the seal member 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Mechanical Sealing (AREA)

Abstract

L'invention porte sur un ensemble d'étanchéité, pour un arbre rotatif autour d'un axe, qui présente une surface circonférentielle externe et qui est disposé à l'intérieur d'un boîtier ayant une surface circonférentielle interne définissant un alésage. L'ensemble d'étanchéité comprend un élément de base annulaire ayant une surface circonférentielle externe et une ouverture centrale pour recevoir l'arbre avec un dégagement, l'élément de base étant dimensionné de telle sorte que la surface externe de base peut venir en prise avec la surface interne de boîtier pour former un ajustement serré pour retenir l'ensemble d'étanchéité. Un élément d'étanchéité annulaire est disposé sur l'élément de base et a une surface d'étanchéité circonférentielle interne pour un contact étanche contre la surface externe de l'arbre, et une surface d'étanchéité circonférentielle externe pour un contact étanche contre la surface interne de boîtier. Un élément de support, qui comprend un corps annulaire en une seule pièce, est disposé généralement entre la surface d'étanchéité d'élément d'étanchéité et une partie de l'élément de base, et empêche une déviation axiale de l'élément d'étanchéité.
PCT/US2010/000338 2009-02-06 2010-02-05 Ensemble d'étanchéité pour arbre rotatif Ceased WO2010090754A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US20697109P 2009-02-06 2009-02-06
US61/206,971 2009-02-06

Publications (2)

Publication Number Publication Date
WO2010090754A2 true WO2010090754A2 (fr) 2010-08-12
WO2010090754A3 WO2010090754A3 (fr) 2010-10-07

Family

ID=42542572

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2010/000338 Ceased WO2010090754A2 (fr) 2009-02-06 2010-02-05 Ensemble d'étanchéité pour arbre rotatif

Country Status (1)

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WO (1) WO2010090754A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018168896A (ja) * 2017-03-29 2018-11-01 Nok株式会社 密封装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213343A (en) * 1988-07-11 1993-05-25 White Hydraulics, Inc. Shaft seal with support member and backing ring
US5975538A (en) * 1997-06-19 1999-11-02 John Crane Inc. Radial lip shaft seal
US6776419B2 (en) * 2002-06-05 2004-08-17 Gregory S. Antoun Seal for a reciprocating plunger
US7681888B2 (en) * 2006-02-15 2010-03-23 Skf Usa Inc. Robust sealing system for power steering input shaft

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018168896A (ja) * 2017-03-29 2018-11-01 Nok株式会社 密封装置

Also Published As

Publication number Publication date
WO2010090754A3 (fr) 2010-10-07

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