GB2414425A - Surface coating for a composite coating - Google Patents
Surface coating for a composite coating Download PDFInfo
- 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- Withdrawn
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)
- Claims 1. A surface coating for a composite bearing, including a frictionreducing compound suspended in an adhesive.
- 2. A surface coating according to claim 1, wherein the friction reducing compound is micronised PTFE powder.
- 3. A surface coating according to claim 1 or claim 2, wherein the adhesive is a water based adhesive
- 4. A surface coating according to claim 3, wherein the adhesive is a water based Poly Vinyl Acetate (PVA) adhesive.
- 5. A surface coating according to any one of the preceding claims, for use in a marine bearing.
- 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. A composite bearing according to claim 6, wherein the friction reducing compound is microbuses PTFE powder.
- 8. A composite bearing according to claim 6 or claim 7, wherein the adhesive is a water based Poly Vinyl Acetate (PVA) adhesive.
- 9. A composite bearing according to claim 8, wherein the adhesive is a water based Poly Vinyl Acetate (PVA) adhesive.
- 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.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.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.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., . . .
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)
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)
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 |
-
2004
- 2004-05-28 GB GB0411996A patent/GB2414425A/en not_active Withdrawn
Patent Citations (7)
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)
Title |
---|
None stick frying pans * |
Cited By (3)
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 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |