WO1988002830A1 - Joint d'etancheite a bec recouvert d'un elastomere - Google Patents

Joint d'etancheite a bec recouvert d'un elastomere Download PDF

Info

Publication number
WO1988002830A1
WO1988002830A1 PCT/US1987/002545 US8702545W WO8802830A1 WO 1988002830 A1 WO1988002830 A1 WO 1988002830A1 US 8702545 W US8702545 W US 8702545W WO 8802830 A1 WO8802830 A1 WO 8802830A1
Authority
WO
WIPO (PCT)
Prior art keywords
case member
seal
lip seal
elastomeric
composite
Prior art date
Application number
PCT/US1987/002545
Other languages
English (en)
Inventor
Andy C. Pilkington
Original Assignee
The Mather Company
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 The Mather Company filed Critical The Mather Company
Publication of WO1988002830A1 publication Critical patent/WO1988002830A1/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
    • F16J15/328—Manufacturing methods specially adapted for elastic sealings
    • 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
    • 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

Definitions

  • This invention relates generally to a lip seal and more particularly relates to a composite lip seal coated with an elastomeric material for sealing bore irregularities and split housings.
  • This invention is primarily intended to improve the lip seal structure disclosed in U.S. Patent M,2*43,235 to Repella the specification of which is incorporated herein by reference.
  • Repella discloses a composite polytetrafluoroethylene and elastomeric lip seal bonded directly to a rigid case formed of a metal or plastic material. While this seal structure is generally satisfactory for its intended purpose, several drawbacks have been associated with the bond interface between the rubber portion of the composite lip seal and the rigid seal case. More particularly, by bonding the rubber portion of the composite lip directly to a rigid surface, an inherent drawback arises wherein the unyielding nature of the rubber-to-metal bond does not well accommodate shock loading of the type commonly experienced in lip seal applications. This can result in premature failure of the bond and shortened seal life.
  • the thermally set adhesive in order to complete the assembly of a composite lip seal to an elastomer-coated case as described above, the thermally set adhesive must be removed from the area on the case to which the composite element is to be bonded. Fresh adhesive must then be applied before the composite element is bonded to the case. This procedure is not only time consuming but is most inconvenient and incurs significant cost.
  • the present invention has been developed to overcome the drawbacks noted above and has as a primary object the provision of a composite lip ⁇ eal struc t ure having an outer bore-engaging surface coated with an elastomeric material for effectively sealing irregular bore surfaces while simultaneously providing a non-rigid elastomeric coating over that portion of the seal, typically the radially projecting flange, to which the composite seal element is attached.
  • the non-rigid elastomeric coating on the radial flange serves to effectively absorb shock transmitted from a rotating member through the sealing portion of the composite lip element to the case member thereby increasing the useful life of the seal.
  • Another object to the invention is to simplify the assembly of a composite lip seal element to a seal case member provided with an elastomeric coating on its outer surface.
  • Still another object is to simultaneously apply an elastomeric coating to the outer surface of a seal as well as to that portion of the seal, typically the radial flange, to which the composite lip element is bonded.
  • Figure 1 which is a radial cross section through a portion of an annular lip seal according to the invention, prior to assembly of the composite lip element to the
  • Fi ⁇ ure 2 which is a radial cross section through a portion of the seal of Figure 1 after assembly of the composite lip element to the case;
  • Figure 3 which is a radial cross section through a portion of the seal of Figure 2 and shown as installed in a typical application depicting the accommodation of shock loading through the resilience provided by an elastomeric coating.
  • FIG. 1 shows a case member 1 , which may be formed of a relatively rigid metal or plastic material.
  • the case member is generally annular in shape as is conventional in lip seal design and includes an axially extending portion 3 and a radially extending portion 5.
  • a ther osetting adhesive is applied to the case surfaces to which the elastomer is to be bonded, such as at 9.
  • the adhesive-treated case member is then placed within a mold cavity and the elastomeric coating is then applied over the case member in a conventional manner.
  • the adhesive is thermally set during the vulcanization of the elastomeric material within the mold thereby providing a strong bond between the case member and the elastomeric material.
  • elastomer-coated case After elastomer-coated case is removed from the mold it is in suitable condition for d rect application of an adhesive required to bond a composite element thereto as described below.
  • This second application of adhesive can be applied by any conventional method such as by spraying or dipping.
  • the elastomeric coating is molded over the outer surface 11 of the axially extending portion 3, the outer surface 13 of the radially extending portion 5, as well as the inner surface 15 of the radially extending portion 5.
  • the elastomeric material molded to the inner surface of the radially extending portion of the case provides a clean bonding surface area 17 for subsequent bonding of a lip sealing element.
  • a dirt exclusion lip 18 may be molded to the inner end of the radially extending portion while molding the elastomeric coating to the case.
  • inner surface 15 By coating inner surface 15 with elastomeric material, the removal of previously applied and thermally set adhesive is obviated.
  • Conventional seal designs without such elastomeric coating applied to inner surface 15 necessitate the removal of the set adhesive from surface 15 after vulcanization in order to provide a clean bonding surface for the subsequent bonding of a lip seal element to the case.
  • the present design greatly facilitates the bonding of a composite lip seal element to the case member.
  • area 17 is suitable for bonding without requiring any cleaning, the assembly and attachment of a lip sealing element is facilitated. If the inner surface 15 of flange 5 was not coated with elastomer, it would require removal of any set adhesive bonded thereto. Thus, by coating surface 15 with elastomer, a cleaning step is avoided.
  • Element 19 After adhesive 25 is applied to surface 17 5 the composite lip seal element 19 is placed over the adhesive and bonded in place.
  • Element 19 includes an elastomeric portion 21 and a polytetrafluoroethylene (PTFE) portion 23 bonded radially concentric thereto.
  • PTFE polytetrafluoroethylene
  • an advantageous result of this improved seal design and assembly method is realized in use during shock loading of the composite element 19 by radial movement or displacement 27 of shaft 29 within bore housing 30. This movement often results from impact loading of the shaft, shaft whip, and other well known causes.
  • the elastomeric material to which element 19 is bonded serves as a non-rigid shock absorbing medium which deflects under load as depicted by arrows 31 and reduces shear stress along the bond interface 25. This accommodation of shock along interface 25 results in improved seal life expectancy by preventing separation of the element 19 from the case 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Gasket Seals (AREA)
  • Closures For Containers (AREA)

Abstract

Un joint d'étanchéité à bec présentant une meilleure résistance aux chocs comprend un organe de boîtier rapide (1) recouvert d'un matériau élastomère (7). Un bec d'étanchéité annulaire composite (19) possédant une partie de fixation (21) composée d'un matériau élastomère et une partie de contact (23) composée de polytétrafluoroéthylène est soudé sur l'organe de boîtier (1) de façon à former une interface élastomère-sur-élastomère (25) amortissant les chocs entre le bec d'étanchéité (19) et le revêtement du boîtier (7).
PCT/US1987/002545 1986-10-10 1987-10-05 Joint d'etancheite a bec recouvert d'un elastomere WO1988002830A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US91756986A 1986-10-10 1986-10-10
US917,569 1986-10-10

Publications (1)

Publication Number Publication Date
WO1988002830A1 true WO1988002830A1 (fr) 1988-04-21

Family

ID=25438978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1987/002545 WO1988002830A1 (fr) 1986-10-10 1987-10-05 Joint d'etancheite a bec recouvert d'un elastomere

Country Status (4)

Country Link
EP (1) EP0287632A1 (fr)
ES (1) ES2007728A6 (fr)
MX (1) MX168944B (fr)
WO (1) WO1988002830A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5209499A (en) * 1992-05-26 1993-05-11 Mather Seal Company Unitized polytetrafluoroethylene radial lip seal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122319A1 (fr) * 1983-03-17 1984-10-24 Firma Carl Freudenberg Joint d'étanchéité
US4513976A (en) * 1984-06-06 1985-04-30 Federal-Mogul Corporation Rotating-lip grease seal
FR2585103A1 (fr) * 1985-07-18 1987-01-23 Procal Bagues d'etancheite de type radial et procede de realisation de telles bagues

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122319A1 (fr) * 1983-03-17 1984-10-24 Firma Carl Freudenberg Joint d'étanchéité
US4513976A (en) * 1984-06-06 1985-04-30 Federal-Mogul Corporation Rotating-lip grease seal
FR2585103A1 (fr) * 1985-07-18 1987-01-23 Procal Bagues d'etancheite de type radial et procede de realisation de telles bagues

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5209499A (en) * 1992-05-26 1993-05-11 Mather Seal Company Unitized polytetrafluoroethylene radial lip seal

Also Published As

Publication number Publication date
MX168944B (es) 1993-06-15
ES2007728A6 (es) 1989-07-01
EP0287632A1 (fr) 1988-10-26

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