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WO1997013992A1 - Obturateurs - Google Patents

Obturateurs Download PDF

Info

Publication number
WO1997013992A1
WO1997013992A1 PCT/GB1996/002449 GB9602449W WO9713992A1 WO 1997013992 A1 WO1997013992 A1 WO 1997013992A1 GB 9602449 W GB9602449 W GB 9602449W WO 9713992 A1 WO9713992 A1 WO 9713992A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing member
seal
face
dust
primary
Prior art date
Application number
PCT/GB1996/002449
Other languages
English (en)
Inventor
Andrew Hugh Longdon
Original Assignee
Dowty Seals Limited
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 Dowty Seals Limited filed Critical Dowty Seals Limited
Publication of WO1997013992A1 publication Critical patent/WO1997013992A1/fr

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
    • F16J15/3228—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip formed by deforming a flat ring

Definitions

  • This invention relates to seals or the kind comprising a resilient sealing member which is adapted to bridge an annular gap between two relatively rotatable concentric parts so that it is loaded in bending and thereby resiliently urges a side face of the seal into sealing engagement with one of said two parts .
  • the sealing member of a seal of the aforesaid kind is generally formed as a flat ring which is secured at one peripheral region to one of said parts, and is over-sized in relation to said gap so that it is deformed axially as it extends radially towards its other free peripheral region in sealing engagement with the other of said parts.
  • the sealing member assumes a tubular shape in that peripheral region which sealingly engages with the other of said parts, which would be the shaft in the case of a shaft seal.
  • the dust seal is located axially alongside the primary seal on that side to be protected from dust, and commonly comprises a sealing member similar to the primary seal.
  • This dust sealing member is secured at one peripheral region to the same part as the primary sealing member, and is deformed axially as it extends radially to bridge the gap and contact the other of said rotatable parts at its other free peripheral region.
  • the dust sealing member is, however, different in size to tiie primary sealing member so that it is deformed axially less and only makes light touching contact at its free peripheral edge with said other rotatable part.
  • both the primary sealing member and the dust sealing member are formed integrally from the same flat ring of resilient plastics by a radial cut formed in it.
  • a seal of the aforesaid kind is provided with a dust seal in the form of a dust sealing member which is integral with the primary sealing member and which, in the un-assembled state of the seal, extends away from a side face of the primary sealing member at an angle.
  • the primary sealing member When assembled between said relatively rotatable parts, the primary sealing member is deformed axially to form an annular seal over its free peripheral region, and this deformation of the primary sealing member moves the dust sealing member so that its free peripheral edge is located in the required position closely adjacent to or touching the other rotatable part.
  • This arrangement offers the advantage of a shorter dust sealing member, which therefore reduces the axial space required to accommodate it within the overall seal assembly, and produces a production cost saving by reducing the amount of plastics material used compared with using a separate dust sealing member.
  • the invention also offers the advantage of a mutually beneficial inter-action between the primary sealing member and the dust sealing member, in that the former acts to positively locate the latter in the required dust sealing position, and the latter helps support the former against bellmouthing, this being a common problem with seals of this kind caused by the stresses of deformation within the sealing member which cause it to lift away from the annular sealing surface over some portions of its circumference.
  • Figure 1 is a partial section of a sealing member according to one embodiment of the invention and shown in the relaxed, un ⁇ assembled state;
  • Figure 2 is a partial section of the sealing member of Figure 1, fitted as a shaft seal;
  • Figure 3 is a side elevation of a sealing member according to a second embodiment of the invention.
  • Figure 4 is a side elevation of the sealing member of Figure 3 as a face seal.
  • the sealing member 1 shown in Figure 1 is machined from resilient plastics material such as PTFE and takes the form of a ring with an outer peripheral region 2, an inner peripheral region 3, and a side face 4 formed at an intermediate region with a dust lip 5 that extends away from it at an acute angle towards the inner peripheral region 3.
  • resilient plastics material such as PTFE
  • the sealing member 1 is secured in an outer annular carrier 6 by crimping of the outer peripheral region 2 of the sealing member in an annular groove 7 in the inner face of the carrier 6.
  • the central apertures of the sealing member 1 receives the shaft 9 within it, and because the aperture 8 is smaller in diameter than the shaft 9, the sealing member 1 is resiliently deformed axially and radially, as shown in Figure 2, so that the inner peripheral region 3 assumes a tubular shape in resilient sealing contact with the shaft 9 over an extended axial portion thereof.
  • Deformation of the sealing member 1 on the shaft 9 causes the dust lip 5 to turn radially inwards towards the shaft so that its free edge 10 is located in the required dust-sealing position relative to the shaft, either closely adjacent to the shaft surface or touching it.
  • the sealing member 1 shown in Figures 3 and 4 is adapted to form a face seal between a carrier 6 and the flat face 11 of an adjacent disc 12 mounted concentrically on a central shaft 13.
  • the sealing member 1 is machined from resilient plastics material such as PTFE and takes a frusto-conical shape with an outer peripheral region 2 to be received and held by crimping within an annular groove 7 in the side face of the carrier 6, and an inner peripheral region 3 adapted to engage the face 11.
  • a dust lip 5 is formed on the outer conical face of the sealing member 1 so as to extend radially outwards therefrom and generally towards the face 11.
  • the sealing member 1 is dimensioned relative to the axial spacing between the carrier 6 and the disc 12 so that it is resiliently deformed axially, and the free edge 10 of the dust lip 5 is brought into sealing contact with the face 11.
  • the dimensions of the sealing member 1 and sealing lip 5, and their relative positioning and angle between them, are all selected to suit the dimensions of the gap to be sealed and the desired sealing cooperation between the sealing member 1 and shaft 9 ( Figure 2) or disc 12 ( Figure 4) at the inner peripheral region 3 and the free edge 10 of the dust lip 5.
  • the angle between the dust lip 5 and shaft 9 or disc 12 is approximately 60 degrees.
  • the invention is applicable to seals which seal against an inner member as shown in Figure 2 , or seals which seal against an outer member. Also, the invention is applicable to seals in which the sealing member incorporates a hydrodynamic sealing feature, such as a spiral groove in its sealing face.

Landscapes

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

Abstract

Cet obturateur comprend un élément (1) d'étanchéité élastique, conçu pour enjamber un espace annulaire entre deux parties (6, 9) concentriques pouvant tourner l'une par rapport à l'autre, afin d'être chargé par cintrage et poussé de façon élastique pour entrer en contact d'étanchéité avec l'une des deux parties. Un joint (5) étanche aux poussières est solidaire de l'obturateur (1) et s'étend à partir d'une face latérale de celui-ci, en formant un angle. Lorsque cet obturateur (1) est placé entre lesdites parties (6, 9), il se déforme axialement afin de constituer un joint annulaire au niveau de son bord périphérique libre et de déplacer le joint (5) étanche aux poussières de manière à ce que son bord (10) périphérique soit en étroite proximité avec l'autre partie, ou touche celle-ci. Cet obturateur (1) peut se présenter comme un disque plat ou revêtir une forme tronconique. On peut utiliser l'invention dans un joint pour arbre tournant ou dans un joint à portée plane.
PCT/GB1996/002449 1995-10-06 1996-10-07 Obturateurs WO1997013992A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9520484.8 1995-10-06
GB9520484A GB2305981A (en) 1995-10-06 1995-10-06 Seals

Publications (1)

Publication Number Publication Date
WO1997013992A1 true WO1997013992A1 (fr) 1997-04-17

Family

ID=10781923

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/002449 WO1997013992A1 (fr) 1995-10-06 1996-10-07 Obturateurs

Country Status (2)

Country Link
GB (1) GB2305981A (fr)
WO (1) WO1997013992A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6149158A (en) * 1998-06-30 2000-11-21 Federal-Mogul World Wide, Inc. Unitized oil seal with PTFE sealing disk split at radially outer edge and method of manufacture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0133928A1 (fr) * 1983-07-28 1985-03-13 Elring Dichtungswerke GmbH Joint pour arbre rotatif
DE3907340A1 (de) * 1989-03-08 1990-09-13 Schaeffler Waelzlager Kg Dichtring aus polymerem werkstoff

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038359A (en) * 1975-01-27 1977-07-26 Garlock Inc. Method of making a shaft seal with dual lip
FR2585103B1 (fr) * 1985-07-18 1989-06-02 Procal Bagues d'etancheite de type radial et procede de realisation de telles bagues
GB8623930D0 (en) * 1986-10-06 1986-11-12 Angus George Co Ltd Shaft seal
US4818620A (en) * 1986-10-10 1989-04-04 Mather Seal Company Elastomer coated lip seal
FR2612595B1 (fr) * 1987-03-16 1990-04-13 Procal Bague d'etancheite de type radial

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0133928A1 (fr) * 1983-07-28 1985-03-13 Elring Dichtungswerke GmbH Joint pour arbre rotatif
DE3907340A1 (de) * 1989-03-08 1990-09-13 Schaeffler Waelzlager Kg Dichtring aus polymerem werkstoff

Also Published As

Publication number Publication date
GB2305981A (en) 1997-04-23
GB9520484D0 (en) 1995-12-06

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