WO1993006394A1 - A method of forming a composite seal - Google Patents

A method of forming a composite seal Download PDF

Info

Publication number
WO1993006394A1
WO1993006394A1 PCT/GB1992/001704 GB9201704W WO9306394A1 WO 1993006394 A1 WO1993006394 A1 WO 1993006394A1 GB 9201704 W GB9201704 W GB 9201704W WO 9306394 A1 WO9306394 A1 WO 9306394A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
channel
forming
composite seal
walls
Prior art date
Application number
PCT/GB1992/001704
Other languages
French (fr)
Inventor
Charles Lindsay Wright
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 WO1993006394A1 publication Critical patent/WO1993006394A1/en

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
    • F16J15/3268—Mounting of sealing 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
    • 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 a method of forming a composite seal.
  • Composite seals have been produced from pressed steel components comprising inner and outer shells between which are placed a gasket and a seal. The shells are arranged to compress the seal against the gasket to- prevent leakage of lubricant past the seal and to retain the seal in position.
  • Each composite seal therefore comprises four major components.
  • a method of forming a composite seal comprising providing a sealing element and a carrier element, forming a channel in the carrier element, inserting an edge of the sealing element into the channel and pressing the channel defining walls together to grip the sealing element therebetween.
  • a method according to the invention thus provides a composite seal with significantly fewer parts making the seal cheaper to produce.
  • pressing it is meant the application of pressure to one or both of the walls to close the. channel, at least, partially.
  • the pressing operation may be carried out a crimping tool or in a rolling or spinning operation in which a roller is applied to one of the walls and the carrier element rotated. A force is applied by the roller to press the walls together.
  • Figure 1 shows the stages in producing a composite seal according to the invention
  • Figure 2 shows the completed composite seal.
  • Figure 1(a) shows the first stage of making a composite seal in which a one piece pressed steel shell.1 is formed as an annulus having an aperture 2 to permit insertion of a shaft.
  • the shell is generally 'L' shape in section having an inner end folded to form a channel 3 defined by walls 4 and 5.
  • annular shaft seal 6 of PTFE (polytetrafluoroethylene) material has its edge 7 inserted into the channel 3.
  • a crimping tool 8 is applied to wall 4 of the channel 3 whilst an outer wall 9 of the carrier is supported by a block 10 as shown in Figure 1(c) .
  • the walls 4 and 5 of the rebate 3 are thus squeezed together compressing the seal 6 and causing a bulge 10 of seal material which substantially fills the channel 3 as shown in Figure 2.
  • the composite seal is mounted about a shaft 11 by inserting the shaft 11 through a central hole of the shaft seal 6.
  • the hole is of a diameter which is slightly smaller than that of the shaft 11 and insertion causes distortion of the seal 6 into sealing contact with the shaft 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

A method of forming a composite seal is provided in which a channel (3) is formed by channel (3) defining walls (3, 5) in a carrier element (1). A seal (6) has its edge (7) inserted into the channel (3) and the walls (3, 5) are pressed together by a crimping tool (8) to grip the seal (6). In this way the seal (6) is retained by the carrier (1) without the requirement from an inner retaining shell.

Description

A METHOD OF FORMING A COMPOSITE SEAL
This invention relates to a method of forming a composite seal.
Composite seals have been produced from pressed steel components comprising inner and outer shells between which are placed a gasket and a seal. The shells are arranged to compress the seal against the gasket to- prevent leakage of lubricant past the seal and to retain the seal in position. Each composite seal therefore comprises four major components.
According to the invention there is provided a method of forming a composite seal comprising providing a sealing element and a carrier element, forming a channel in the carrier element, inserting an edge of the sealing element into the channel and pressing the channel defining walls together to grip the sealing element therebetween.
By gripping the sealing element with the walls of the channel the need for an inner shell is eliminated. Further the walls may be deformed to such an extent that no lubricant can leak past the edge of the sealing element in the channel eliminating the requirement for a gasket. A method according to the invention thus provides a composite seal with significantly fewer parts making the seal cheaper to produce.
By pressing, it is meant the application of pressure to one or both of the walls to close the. channel, at least, partially. The pressing operation may be carried out a crimping tool or in a rolling or spinning operation in which a roller is applied to one of the walls and the carrier element rotated. A force is applied by the roller to press the walls together.
A specific embodiment of the invention will now be described, by way of example only, with reference to the drawings in which:
Figure 1 shows the stages in producing a composite seal according to the invention; and Figure 2 shows the completed composite seal.
Figure 1(a) shows the first stage of making a composite seal in which a one piece pressed steel shell.1 is formed as an annulus having an aperture 2 to permit insertion of a shaft. The shell is generally 'L' shape in section having an inner end folded to form a channel 3 defined by walls 4 and 5.
As shown in Figure 1(b), an annular shaft seal 6 of PTFE (polytetrafluoroethylene) material has its edge 7 inserted into the channel 3. With the seal 6 maintained in position, a crimping tool 8 is applied to wall 4 of the channel 3 whilst an outer wall 9 of the carrier is supported by a block 10 as shown in Figure 1(c) . The walls 4 and 5 of the rebate 3 are thus squeezed together compressing the seal 6 and causing a bulge 10 of seal material which substantially fills the channel 3 as shown in Figure 2. In use the composite seal is mounted about a shaft 11 by inserting the shaft 11 through a central hole of the shaft seal 6. The hole is of a diameter which is slightly smaller than that of the shaft 11 and insertion causes distortion of the seal 6 into sealing contact with the shaft 11.

Claims

1. A method of forming a composite seal comprising providing a sealing element and a carrier element, forming a channel in the carrier element by a folding operation, inserting an edge of the sealing element into the channel and pressing the channel defining walls together to grip the sealing element therebetween.
2. A method as claimed in claim 1 wherein the walls are pressed together until the sealing element substantially fills the channel.
3. A method of forming a composite seal substantially as hereinbefore described with reference to and as illustrated by the drawing.
4. A composite seal is substantially as • hereinbefore described and as illustrated by the drawing.
PCT/GB1992/001704 1991-09-20 1992-09-17 A method of forming a composite seal WO1993006394A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9120103A GB2259740A (en) 1991-09-20 1991-09-20 A method of forming a composite seal
GB9120103.8 1991-09-20

Publications (1)

Publication Number Publication Date
WO1993006394A1 true WO1993006394A1 (en) 1993-04-01

Family

ID=10701728

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/001704 WO1993006394A1 (en) 1991-09-20 1992-09-17 A method of forming a composite seal

Country Status (3)

Country Link
CN (1) CN1071236A (en)
GB (1) GB2259740A (en)
WO (1) WO1993006394A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442080A1 (en) * 1994-11-25 1996-05-30 Bruss Dichtungstechnik Seal for moving component and mfg. process

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9526171D0 (en) * 1995-12-21 1996-02-21 Dowty Seals Ltd Gas purge lip seal
GB0012559D0 (en) * 2000-05-24 2000-07-12 Forsheda Limited Seal
EP3123063A4 (en) 2014-03-27 2018-03-07 Saint-Gobain Performance Plastics Corporation Rotary shaft housing and seal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250541A (en) * 1962-03-08 1966-05-10 Chicago Rawhide Mfg Co Radial lip seals

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB473663A (en) * 1935-08-03 1937-10-18 Simpson Catherwood Leonard Jr Improvements in oil seals for shafts and methods of making the same
GB1380410A (en) * 1971-12-02 1975-01-15 Whessoe Ltd Making seal assemblies
GB8616054D0 (en) * 1986-07-01 1986-08-06 Dowty Seals Ltd Seals
GB8908835D0 (en) * 1989-04-19 1989-06-07 Dowty Seals Ltd Annular seals

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250541A (en) * 1962-03-08 1966-05-10 Chicago Rawhide Mfg Co Radial lip seals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442080A1 (en) * 1994-11-25 1996-05-30 Bruss Dichtungstechnik Seal for moving component and mfg. process
US5756025A (en) * 1994-11-25 1998-05-26 Dichtungstechnik G. Bruss Gmbh & Co.Kg Method for injection molding a seal carrier to a sealing member
US6139023A (en) * 1994-11-25 2000-10-31 Dichtungstechnik G. Bruss Gmbh & Co. Kg Seal for movable structural components

Also Published As

Publication number Publication date
CN1071236A (en) 1993-04-21
GB9120103D0 (en) 1991-11-06
GB2259740A (en) 1993-03-24

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