WO1998020264A1 - Forming a bearing - Google Patents

Forming a bearing Download PDF

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Publication number
WO1998020264A1
WO1998020264A1 PCT/GB1997/002846 GB9702846W WO9820264A1 WO 1998020264 A1 WO1998020264 A1 WO 1998020264A1 GB 9702846 W GB9702846 W GB 9702846W WO 9820264 A1 WO9820264 A1 WO 9820264A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
support
mush
particulate material
polytetrafluoroethylene
Prior art date
Application number
PCT/GB1997/002846
Other languages
French (fr)
Inventor
Julie Ann Mcdonald
Original Assignee
T & N Technology 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10802493&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1998020264(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by T & N Technology Limited filed Critical T & N Technology Limited
Priority to US09/297,791 priority Critical patent/US6289590B1/en
Priority to AT97945017T priority patent/ATE257223T1/en
Priority to JP52111898A priority patent/JP2001508526A/en
Priority to DE69727066T priority patent/DE69727066T3/en
Priority to EP97945017A priority patent/EP0932772B2/en
Priority to BR9712742-6A priority patent/BR9712742A/en
Publication of WO1998020264A1 publication Critical patent/WO1998020264A1/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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S384/00—Bearings
    • Y10S384/90—Cooling or heating
    • Y10S384/908—Nylon or polytetrafluorethylene
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49707—Bearing surface treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49709—Specific metallic composition

Definitions

  • This invention is concerned with a method of forming a bearing of the type which comprises a support on which a bearing lining layer is formed.
  • the bearing then presents a plain surface against which a moving member, eg a rotating shaft, can move.
  • the mush is spread on to a support, eg a sintered bronze layer on a steel backing, and is heated to cure the mush to thereby form it into a bearing lining layer on the support.
  • the bearing lining bearings produced by this method are susceptible to cavitation erosion, ie the tendency for lubrication oil used with the bearing to cause cavities in the lining material. Furthermore, this method has the disadvantage that it involves the use of a significant quantity of lubricant which includes a volatile solvent (toluene is commonly used as the lubricant) .
  • the invention provides a method of forming a bearing comprising adding an aqueous colloidal dispersion of at least one particulate material to an aqueous dispersion of polytetrafluoroethylene, the method also comprising mixing the dispersions for a period sufficient to allow the polytetrafluoroethylene to coagulate to form a mush, spreading the mush on to a support, and curing the mush to form a bearing lining layer on the support.
  • the aqueous colloidal dispersion contains small particles which cause the PTFE to coagulate without the addition of aluminium nitrate or another salt. It is believed that the small particles act as seeds around which the PTFE coagulates. Furthermore, it is found that the bearing lining material containing small particles has greater cavitation erosion resistance. In addition, it is found that the method can be carried out using no lubricant or significantly less lubricant than the conventional method (eg less than 1% by volume as opposed to about 10%) and non-volatile lubricants, such as polyol-based lubricants, can be used.
  • the particles of the particulate material preferably have their median dimension between 1 nanometre and 100 nanometres. Most preferably, the median dimension is between 5 nanometres and 30 nanometres.
  • the particulate material may be selected from the group consisting of metals, metal oxides, metal sulphides, metal fluorides, metal carbonates, metal phosphates and silica. Possibilities include oxides of aluminium, tin, titanium, iron, zinc, copper and lead, metals such as iron, tin, nickel chromium, copper and zinc, sulphides of cadmium, iron, lead, copper and zinc, cadmium carbonate, calcium fluoride, and phosphates of aluminium, cobalt and iron.
  • additional fillers may be included in the aqueous dispersion of polytetrafluoroethylene, eg non-colloidal calcium fluoride, fibres of glass or aramid, or lead.
  • polytetrafluoroethylene eg non-colloidal calcium fluoride, fibres of glass or aramid, or lead.
  • the invention also provides a bearing formed by a method according to the invention, comprising a support which comprises a sintered bronze support, the bearing also comprising a lining layer which is impregnated into the support and stands proud thereof, the lining layer comprising polytetrafluoroethylene in which particulate material is dispersed, characterised in that the particulate material has a median particle dimension of between 1 nanometre and 100 nanometres.
  • the particulate material is preferably alumina.
  • aqueous dispersion of PTFE was mixed with 20ml of a pigment for 5 minutes in a Kenwood mixer.
  • 20ml of a non-volatile polyol-based lubricant was added and the mixture was mixed for a further two minutes.
  • 300ml of an alumina colloid (20% w/v) was added and mixed for 15 minutes.
  • the alumina colloid contained alumina particles having a median dimension of 20 nanometres. Coagulation of the PTFE occurred during this 15 minute period.
  • the resultant polymer "mush” was then left to stand for 30 minutes before being applied to a support which was formed of sintered bronze mounted on a steel backing.
  • the mush composition was: PTFE 86.1% v/v, alumina 7.2% v/v, and lubricant 6.7% v/v.
  • the mush was rolled on to the sintered bronze support using a twin rolling mill thereby impregnating the mush into the porosity of the sintered support. The rolling continued until the mush stood proud of the support by 25 to 30 microns. The mush was then cured at 360°C for 4.5 minutes.
  • Samples made by the illustrative example were tested under lubricated conditions (strut oil) in a cavitation erosion test rig for 60 minutes.
  • the samples were flat and 40mm x 40mm.
  • the cavitation erosion damage was induced using a vibrating amplifying horn operating at an amplitude of 15 microns and a 1mm separation.
  • the samples did not have the bronze sinter exposed at all, ie the lining layer had not been completely removed anywhere.
  • the test was repeated using samples made by the conventional method referred to above. In all cases, at least 10% of the lining layer had been removed exposing the sintered support layer and, in some cases, as much as 50% was exposed.
  • a sample of the bearing made by the illustrative example was tested for wear resistance under non-lubricated conditions using a Halley test rig.
  • a stainless steel roller was rotated against a flat sample for 24 hours.
  • the volume of material removed from the sample was recorded as 0.22mm 3 and also a final width of the wear scar formed by the roller was measured.
  • the results showed that both the volume of material removed (0.53 mm 3 ) and the wear scar width were higher for bearings made by the conventional method described above.
  • the dynamic coefficient of friction measured under dry conditions for the samples made by the illustrative example was found to be 0.09 as opposed to the 0.1 measured for pure PTFE.
  • the lubricant was omitted entirely and the quantity of alumina colloid was reduced to 150 ml. It was still found to be possible to make satisfactory bearings. In another variation still with 150 ml of alumina colloid, the quantity of lubricant was 0.5 to 2 ml (still the polyol- based lubricant) . The bearings were satisfactory and spreadability of the mush was improved.

Abstract

A method of forming a bearing comprising adding an aqueous colloidal dispersion of at least one particulate material to an aqueous dispersion of polytetrafluoroethylene. The method also comprises mixing the dispersions for a period sufficient to allow the polytetrafluoroethylene to coagulate to form a mush, spreading the mush onto a support, and curing the mush to form a bearing lining layer on the support.

Description

FORMING A BEARING
This invention is concerned with a method of forming a bearing of the type which comprises a support on which a bearing lining layer is formed. The bearing then presents a plain surface against which a moving member, eg a rotating shaft, can move.
A conventional method (see for example GB 2 279 998 A) of forming a bearing comprises mixing polytetrafluoroethylene (PTFE) in an aqueous dispersion with a filler, and optionally strengthening fibres and/or other fillers, adding a lubricant to assist in spreading, and adding an aqueous solution of aluminium nitrate or another salt to cause the PTFE to coagulate to form a "mush". The mush is spread on to a support, eg a sintered bronze layer on a steel backing, and is heated to cure the mush to thereby form it into a bearing lining layer on the support. The bearing lining bearings produced by this method are susceptible to cavitation erosion, ie the tendency for lubrication oil used with the bearing to cause cavities in the lining material. Furthermore, this method has the disadvantage that it involves the use of a significant quantity of lubricant which includes a volatile solvent (toluene is commonly used as the lubricant) .
It is an object of the present invention to provide a method of forming a bearing which results in a bearing with improved cavitation erosion resistance and wear resistance
The invention provides a method of forming a bearing comprising adding an aqueous colloidal dispersion of at least one particulate material to an aqueous dispersion of polytetrafluoroethylene, the method also comprising mixing the dispersions for a period sufficient to allow the polytetrafluoroethylene to coagulate to form a mush, spreading the mush on to a support, and curing the mush to form a bearing lining layer on the support.
In a method according to the invention, the aqueous colloidal dispersion contains small particles which cause the PTFE to coagulate without the addition of aluminium nitrate or another salt. It is believed that the small particles act as seeds around which the PTFE coagulates. Furthermore, it is found that the bearing lining material containing small particles has greater cavitation erosion resistance. In addition, it is found that the method can be carried out using no lubricant or significantly less lubricant than the conventional method (eg less than 1% by volume as opposed to about 10%) and non-volatile lubricants, such as polyol-based lubricants, can be used.
In a method according to the invention, the particles of the particulate material preferably have their median dimension between 1 nanometre and 100 nanometres. Most preferably, the median dimension is between 5 nanometres and 30 nanometres. The particulate material may be selected from the group consisting of metals, metal oxides, metal sulphides, metal fluorides, metal carbonates, metal phosphates and silica. Possibilities include oxides of aluminium, tin, titanium, iron, zinc, copper and lead, metals such as iron, tin, nickel chromium, copper and zinc, sulphides of cadmium, iron, lead, copper and zinc, cadmium carbonate, calcium fluoride, and phosphates of aluminium, cobalt and iron.
In order to increase the strength or other properties of the bearing lining material, additional fillers may be included in the aqueous dispersion of polytetrafluoroethylene, eg non-colloidal calcium fluoride, fibres of glass or aramid, or lead.
The invention also provides a bearing formed by a method according to the invention, comprising a support which comprises a sintered bronze support, the bearing also comprising a lining layer which is impregnated into the support and stands proud thereof, the lining layer comprising polytetrafluoroethylene in which particulate material is dispersed, characterised in that the particulate material has a median particle dimension of between 1 nanometre and 100 nanometres. The particulate material is preferably alumina.
There now follows a detailed description of an illustrative example in accordance with the invention.
In the illustrative example, one litre of an aqueous dispersion of PTFE was mixed with 20ml of a pigment for 5 minutes in a Kenwood mixer. To this dispersion, 20ml of a non-volatile polyol-based lubricant was added and the mixture was mixed for a further two minutes. Then, 300ml of an alumina colloid (20% w/v) was added and mixed for 15 minutes. The alumina colloid contained alumina particles having a median dimension of 20 nanometres. Coagulation of the PTFE occurred during this 15 minute period. The resultant polymer "mush" was then left to stand for 30 minutes before being applied to a support which was formed of sintered bronze mounted on a steel backing. The mush composition was: PTFE 86.1% v/v, alumina 7.2% v/v, and lubricant 6.7% v/v.
The mush was rolled on to the sintered bronze support using a twin rolling mill thereby impregnating the mush into the porosity of the sintered support. The rolling continued until the mush stood proud of the support by 25 to 30 microns. The mush was then cured at 360°C for 4.5 minutes.
Samples made by the illustrative example were tested under lubricated conditions (strut oil) in a cavitation erosion test rig for 60 minutes. The samples were flat and 40mm x 40mm. The cavitation erosion damage was induced using a vibrating amplifying horn operating at an amplitude of 15 microns and a 1mm separation. At the end of the test, it was found that the samples did not have the bronze sinter exposed at all, ie the lining layer had not been completely removed anywhere. The test was repeated using samples made by the conventional method referred to above. In all cases, at least 10% of the lining layer had been removed exposing the sintered support layer and, in some cases, as much as 50% was exposed.
A sample of the bearing made by the illustrative example was tested for wear resistance under non-lubricated conditions using a Halley test rig. In this test, a stainless steel roller was rotated against a flat sample for 24 hours. The volume of material removed from the sample was recorded as 0.22mm3 and also a final width of the wear scar formed by the roller was measured. The results showed that both the volume of material removed (0.53 mm3) and the wear scar width were higher for bearings made by the conventional method described above.
The dynamic coefficient of friction measured under dry conditions for the samples made by the illustrative example was found to be 0.09 as opposed to the 0.1 measured for pure PTFE.
In a variation of the illustrative method, the lubricant was omitted entirely and the quantity of alumina colloid was reduced to 150 ml. It was still found to be possible to make satisfactory bearings. In another variation still with 150 ml of alumina colloid, the quantity of lubricant was 0.5 to 2 ml (still the polyol- based lubricant) . The bearings were satisfactory and spreadability of the mush was improved.

Claims

A method of forming a bearing comprising adding an aqueous colloidal dispersion of at least one particulate material to an aqueous dispersion of polytetrafluoroethylene, the method also comprising mixing the dispersions for a period sufficient to allow the polytetrafluoroethylene to coagulate to form a mush, spreading the mush on to a support, and curing the mush to form a bearing lining layer on the support.
A method according to claim 1, characterised in that the particles of the particulate material have their median dimension between 1 nanometre and 100 nanometres .
A method according to claim 2, characterised in that the median dimension is between 5 nanometres and 30 nanometres .
A method according to any one of claims 1 to 3 , characterised in that the particulate material is selected from the group consisting of metals, metal oxides, metal sulphides, metal fluorides, metal carbonates, metal phosphates and silica.
A method according to any one of claims 1 to 4, characterised in that additional fillers are included in the aqueous dispersion of polytetrafluoroethylene.
A bearing formed by a method according to any one of claims 1 to 5, comprising a support which comprises a sintered bronze support, the bearing also comprising a lining layer which is impregnated into the support and stands proud thereof, the lining layer comprising polytetrafluoroethylene in which particulate material is dispersed, characterised in that the particulate material has a median particle dimension of between 1 nanometre and 100 nanometres.
A bearing according to claim 6, characterised in that the particulate material is alumina.
PCT/GB1997/002846 1996-11-06 1997-10-15 Forming a bearing WO1998020264A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US09/297,791 US6289590B1 (en) 1996-11-06 1997-10-15 Method of forming a bearing
AT97945017T ATE257223T1 (en) 1996-11-06 1997-10-15 METHOD FOR SHAPING A PLAIN BEARING
JP52111898A JP2001508526A (en) 1996-11-06 1997-10-15 Bearing forming method
DE69727066T DE69727066T3 (en) 1996-11-06 1997-10-15 TREATMENT FOR THE FORMATION OF A SLIDING STOCK TYPE
EP97945017A EP0932772B2 (en) 1996-11-06 1997-10-15 Forming a bearing
BR9712742-6A BR9712742A (en) 1996-11-06 1997-10-15 Bearing, and, process to form the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9623052A GB2319067B (en) 1996-11-06 1996-11-06 Forming a bearing
GB9623052.9 1996-11-06

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09/297,791 A-371-Of-International US6289590B1 (en) 1996-11-06 1997-10-15 Method of forming a bearing
US09/904,438 Division US20020018605A1 (en) 1996-11-06 2001-07-12 Forming a bearing

Publications (1)

Publication Number Publication Date
WO1998020264A1 true WO1998020264A1 (en) 1998-05-14

Family

ID=10802493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002846 WO1998020264A1 (en) 1996-11-06 1997-10-15 Forming a bearing

Country Status (8)

Country Link
US (2) US6289590B1 (en)
EP (1) EP0932772B2 (en)
JP (1) JP2001508526A (en)
AT (1) ATE257223T1 (en)
BR (1) BR9712742A (en)
DE (1) DE69727066T3 (en)
GB (1) GB2319067B (en)
WO (1) WO1998020264A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
EP0932772A1 (en) 1999-08-04
GB2319067B (en) 2000-06-28
US6289590B1 (en) 2001-09-18
BR9712742A (en) 1999-12-21
DE69727066T2 (en) 2004-07-15
DE69727066T3 (en) 2011-11-17
EP0932772B1 (en) 2004-01-02
US20020018605A1 (en) 2002-02-14
JP2001508526A (en) 2001-06-26
EP0932772B2 (en) 2011-03-30
ATE257223T1 (en) 2004-01-15
GB9623052D0 (en) 1997-01-08
DE69727066D1 (en) 2004-02-05
GB2319067A (en) 1998-05-13

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