GB2414425A - Surface coating for a composite coating - Google Patents

Surface coating for a composite coating Download PDF

Info

Publication number
GB2414425A
GB2414425A GB0411996A GB0411996A GB2414425A GB 2414425 A GB2414425 A GB 2414425A GB 0411996 A GB0411996 A GB 0411996A GB 0411996 A GB0411996 A GB 0411996A GB 2414425 A GB2414425 A GB 2414425A
Authority
GB
United Kingdom
Prior art keywords
adhesive
composite bearing
bearing
surface coating
composite
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.)
Withdrawn
Application number
GB0411996A
Other versions
GB0411996D0 (en
Inventor
Alexander Richard Willi Barron
Timothy David Biswell
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.)
Railko Ltd
Original Assignee
Railko Ltd
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 Railko Ltd filed Critical Railko Ltd
Priority to GB0411996A priority Critical patent/GB2414425A/en
Publication of GB0411996D0 publication Critical patent/GB0411996D0/en
Publication of GB2414425A publication Critical patent/GB2414425A/en
Withdrawn legal-status Critical Current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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lubricants (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)

Abstract

The coating comprises a dry friction reducing compound, preferably polytetrafluoroethylene (PTFE), suspended in an adhesive, preferably aqueous polyvinyl acetate (PVAc). Preferably the bearing includes thermosetting phenolic, polyester or epoxy based resin, a lubricant and reinforcing fibres. The fibres can be cotton, viscose, bast, polyester, polyamide, polyacrylonitrile (PAN), aramid, polybenzoxyzole or carbon. Disclosed lubricants are graphite and molybdenum disulphide. The bearing is a marine bearing.

Description

24 1 4425 Surface coating for a composite bearing The present invention
relates to a surface coating for a composite bearing and to a bearing that includes a surface coating. In particular but not exclusively the invention relates to a composite bearing for use in marine vessels, for example in the stern tube of a marine vessel, and a coating for use in such a bearing.
The purpose of a lubricated bearing composite is to maintain movement of th drive train in the event of a failure in the lubrication system. The composite bearing is designed to be a sacrificial and replaceable component, which has the benefit of reducing potential damage to an expensive shaft in the event of lubrication system failure.
A typical example of a composite bearing material designed for use in this type of application Is the asbestos fbre reinforced phenolic resin bearing material "WA80H" manufactured by Railko Ltd. Marine bearings made of this asbestos fbre reinforced phenolic resin material have an increased tolerance to loss of oil lubricant and water ingress.
Alternative composite bearing materials can be based on various different combinations of thermosetting resins and fibrous reinforcing materials. For example, fibrous reinforcing materials used In marine bearing applications include cotton, viscose, best fibre, polyester, polyamide, polyacrylonitrile, aramid, polybenzoxyzole and carbon fibre, or blends of two or more of those materials. The fibrous material may consist of a yarn, a woven fabric or a non-woven sheet. The thermosetting resin may comprise a phenolic based resin, a polyester based resin or an epoxy based resin.
Composite bearings for the marine industry, and in particular propeller shaft bearings, are bespoke items that are machined to match and correct misalignment generated In the building of a ship.
Machining composites Is a skilled art and the quality of the surface finish can be a variable that affects the performance of the composite bearing.
It has been recorded that some bearings require a 'running-in' period to provide conformation between the shaft and the bearing and to produce smooth surfaces, allowing oil flow between the surfaces and subsequent hydrodynamic operation.
According to a first aspect of the present nvenbon there is provided a surface coating for a composite beanng, including a dry friction reducing compound suspended in an adhesive.
The inventors have discovered that by the addition of a thin, low friction film, the onset of hydrodynamic operation can be generated at an earlier stage than If it was absent. This low friction film can be generated for example by suspending a dry friction reducing compound in an adhesive, applying the ': . . adhesive to the running surfaces of the composite bearing and allowing the adhesive to dry.
In a preferred embodiment of the invention, the friction reducing compound is micronised PTFE powder and the adhesive is a water based Poly Vinyl Acetate (PVA) adhesive. Other friction reducing compounds and adhesives may also be suitable.
According to a second aspect of the present invention there is provided a composite bearing, including a composite bearing material having a surface coating that includes a dry friction reducing compound suspended in an adhesive.
The composite bearing material may for example include a thermosetting resin and a reinforcing material. This combination of materials provides the required bearing characteristics and is tolerant of loss of lubricant and water contamination of the lubricant.
The reinforcing material may include a fibrous material selected from a group including cotton, viscose, best flare, polyester, polyamide, polyacrylonitrile, aramd, polybenzoxyzole and carbon fibre, or a blend of two or more of those fbres. For example, the fibrous material may include a blend of para-aramd fibre, cellulose fibre and polyacrylonitrile fibre. The fibrous material may also includes a small quantity of glass fibre, to increase the strength of the layer and produce a polishing affect on the bearing.
The fibrous material may consist of a yarn, a woven fabric or a non-woven sheet, and in particular may be a resin-impregnated yarn.
The thermosetting resin may comprise a phenolic based resin, a polyester based resin or an epoxy based resin, and is preferably a phenolic based resin.
The composite bearing material may include a filler material, for example china clay or dolomite.
The composite bearing material may include a lubricant material, for example graphite, PTFE or molybdenum disulphide, to reduce friction between the bearing and the propeller shaft.
. . .

Claims (13)

  1. Claims 1. A surface coating for a composite bearing, including a friction
    reducing compound suspended in an adhesive.
  2. 2. A surface coating according to claim 1, wherein the friction reducing compound is micronised PTFE powder.
  3. 3. A surface coating according to claim 1 or claim 2, wherein the adhesive is a water based adhesive
  4. 4. A surface coating according to claim 3, wherein the adhesive is a water based Poly Vinyl Acetate (PVA) adhesive.
  5. 5. A surface coating according to any one of the preceding claims, for use in a marine bearing.
  6. 6. A composite bearing, including a composite bearing material having a surface coating that includes a dry friction reducing compound suspended in a water based adhesive.
  7. 7. A composite bearing according to claim 6, wherein the friction reducing compound is microbuses PTFE powder.
  8. 8. A composite bearing according to claim 6 or claim 7, wherein the adhesive is a water based Poly Vinyl Acetate (PVA) adhesive.
  9. 9. A composite bearing according to claim 8, wherein the adhesive is a water based Poly Vinyl Acetate (PVA) adhesive.
  10. A composite bearing according to any one of claims 6 to 9, wherein the composite bearing material includes a thermosettng resin and a reinforcing material.
  11. 11.A composite bearing according to claim 10, wherein the thermosettng resin is a phenolc based resin, a polyester based resin or an epoxy based resin.
  12. 12.A composite bearing according to claim 10 or claim 11, wherein the reinforcing material includes a fibrous material selected from a group including cotton, viscose, best fibre, polyester, polyamide, polyacrylonitnle, aramid, polybenzoxyzole and carbon fibre, or a blend of two or more of those fibres.
  13. 13.A composite bearing according to any one of claims 10 to 12, wherein the composite bearing material includes a lubricant material.
    14 A composite bearing according to any one of claims 6 to 13, wherein the bearing is a marine bearing.
    , . . .
GB0411996A 2004-05-28 2004-05-28 Surface coating for a composite coating Withdrawn GB2414425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0411996A GB2414425A (en) 2004-05-28 2004-05-28 Surface coating for a composite coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0411996A GB2414425A (en) 2004-05-28 2004-05-28 Surface coating for a composite coating

Publications (2)

Publication Number Publication Date
GB0411996D0 GB0411996D0 (en) 2004-06-30
GB2414425A true GB2414425A (en) 2005-11-30

Family

ID=32671259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0411996A Withdrawn GB2414425A (en) 2004-05-28 2004-05-28 Surface coating for a composite coating

Country Status (1)

Country Link
GB (1) GB2414425A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8703668B2 (en) 2007-02-13 2014-04-22 Whitford Ltd. Bearing components and processes for depositing additives, especially fluoropolymers, on cellulose
EP2886206A1 (en) * 2013-12-19 2015-06-24 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Method of coating a bushing and bushing coated according to this method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1203081A (en) * 1966-07-21 1970-08-26 Heim Universal Corp Improvements in bearings and method of construction thereof
GB1279346A (en) * 1969-06-19 1972-06-28 Sargent Industries Bearing liner and method of making same
EP0004136A1 (en) * 1978-02-28 1979-09-19 Imperial Chemical Industries Plc Aromatic polyethersulphones, their preparation, dispersions thereof and their use as adhesives and coatings
JPS55157664A (en) * 1979-05-26 1980-12-08 Hazama Gumi Ltd Coating composition giving lubricated surface
GB2075368A (en) * 1979-11-22 1981-11-18 Glyco Metall Werke Composite material with two or plurality of layers
WO1983003612A1 (en) * 1982-04-17 1983-10-27 Schimizu, Takuro Coating layer for sliding surface
WO1993017077A1 (en) * 1992-02-21 1993-09-02 Dunton Ronald K Poly(fluorinated ethylene) coatings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1203081A (en) * 1966-07-21 1970-08-26 Heim Universal Corp Improvements in bearings and method of construction thereof
GB1279346A (en) * 1969-06-19 1972-06-28 Sargent Industries Bearing liner and method of making same
EP0004136A1 (en) * 1978-02-28 1979-09-19 Imperial Chemical Industries Plc Aromatic polyethersulphones, their preparation, dispersions thereof and their use as adhesives and coatings
JPS55157664A (en) * 1979-05-26 1980-12-08 Hazama Gumi Ltd Coating composition giving lubricated surface
GB2075368A (en) * 1979-11-22 1981-11-18 Glyco Metall Werke Composite material with two or plurality of layers
WO1983003612A1 (en) * 1982-04-17 1983-10-27 Schimizu, Takuro Coating layer for sliding surface
WO1993017077A1 (en) * 1992-02-21 1993-09-02 Dunton Ronald K Poly(fluorinated ethylene) coatings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None stick frying pans *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8703668B2 (en) 2007-02-13 2014-04-22 Whitford Ltd. Bearing components and processes for depositing additives, especially fluoropolymers, on cellulose
US9205454B2 (en) 2007-02-13 2015-12-08 Whitford Ltd. Bearing components and processes for depositing additives, especially fluoropolymers, on cellulose
EP2886206A1 (en) * 2013-12-19 2015-06-24 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Method of coating a bushing and bushing coated according to this method

Also Published As

Publication number Publication date
GB0411996D0 (en) 2004-06-30

Similar Documents

Publication Publication Date Title
US4725151A (en) Thermoplastic-rubber polymer alloys and method of producing the same
CN1105834C (en) Self-lubricated bearing
US4666318A (en) Self-lubricating bearings
US5880043A (en) Fiber-reinforced material and production and use thereof
EP1616107B1 (en) Composite bearings
KR100499537B1 (en) Composite bearings containing iron oxide additives
EP2955400B1 (en) Bearing liner
US6705946B2 (en) Oil-less shaft coupling utilizing carbon-carbon composite and method of fabrication thereof
Arun et al. Friction and wear behaviour of glass fibre reinforced polymer composite (GFRP) under dry and oil lubricated environmental conditions
IE911068A1 (en) Fiber-reinforced material and production and use thereof
JP4336747B2 (en) Propeller shaft bearing
GB2414425A (en) Surface coating for a composite coating
JP2016540171A (en) Rolling bearing cage
EP2955399B1 (en) Plain bearing
EP2955401B1 (en) Plain bearing
JPS6293519A (en) Bearing assembly
CN111981037A (en) Bushing with improved wear resistance and sliding bearing comprising such a bushing
EP3189124B1 (en) Composite bearing with enhanced wear and machinability
JP2021110345A (en) Spherical slide bearing
RU2377449C2 (en) Friction bearing
CN209001717U (en) A kind of motor throw rijng
WO2013186527A1 (en) Plain bearing
JP2020020393A (en) Sliding member

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)