Improvements in or relating to frictional contact elements
Document Number
GB Patent 971355
Publication Date
1964-09-30
Link
Inventors
not available
Abstract
Abstract of
GB971355
971,355. Bearings. J. J. CAUBET. Oct. 9, 1962 [Oct. 10, 1961], No. 38268/62. Heading F2A. [Also in Division E2] A bearing assembly, or a ball-and-socket assembly, consists of a member which is wholly or partly of synthetic resin and a second member which is ferrous and has been nitrided in a bath of melted cyanates and/or cyanides. The first member may be bronze coated with a layer of synthetic resin, and the resin may be P.T.F.E. or a phenol-plastic resin.
Improvements in or relating to frictional contact elements
Inventor: CAUBET JACQUES JEAN
Applicant:
EC:F16C33/04; F16C33/24
IPC: F16C33/04; F16C33/24;F16C33/04
Publication info: FR1320025 A - 1963-03-08
2
Improvements in or relating to frictional contact elements
Inventor:
Applicant: CAUBET JACQUES JEAN
EC:F16C33/04; F16C33/24
IPC: F16C33/04; F16C33/24;F16C33/04
Publication info: GB971355 A - 1964-09-30
List of citing documents
Claims
WHAT I CLAIM IS:
1 Improvements in frictional contact elements for bearings, pivots and mechanical components, consisting of one part made wholly or partly of synthetic resin and one part made of a ferrous metal, the 35 latter part having been processed to acquire an interstitial solution of nitrogen in its surface layers, the surface solution of nitrogen being obtained by treating in a bath of melted nitrated salts, such as 40 cyanides and/or cyanates.
2 Improvements according to claim 1, wherein the part made of synthetic resin consists of polytetrafluoroethylene.
3 Improvements according to claim 1, 45 wherein the part made of synthetic resin consists of a phenol-plastic resin.
4 A frictional contact element substantially as hereinbefore described with reference to the Examples 50 JACQUES JEAN CAUBET.
Per: BOULT, WADE & TENNANT, 111-112, Hatton Garden, London, E C 1.
Chartered Patent Agents.
Printed by Her Majesty's Stationery Office, St Stephen's Parliamentary Press-1964 Published at The Patent Office, 25, Southampton Buildings, London, W C 2 from which copies may be obtained ( 82523) 9/64 St S.
Description
PATENT SPECIFICATION
NO DRAWINGS 971,355 ) Date of Application and Filing Complete Specification Oct 9, 1962.
No 38268/62.
Application made in France (No 8300) on Oct 10, 1961.
Complete Specification Published Sept 30, 1964.
T V Crown Copyright 1964.
Index at Acceptance:-F 2 A( 6 A 1, 6 A 2); E 2 F(l B, l Tl, 3 DX) International Classification:-F 06 c (F 06 f) COMPLETE SPECIFICATION
Improvements in or relating to frictional contact elements I, JACQUES JEAN CAUBET, a citizen of the French Republic, of 79, Rue Neyron, Saint-Etienne (Loire), France, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to frictional contact elements which can work in a satisfactory manner without lubricant.
These elements can be used for parts of machines which are inaccessible during operation or are intended to work under difficult conditions, such as in water or mud This is particularly the case with drilling equipment, machines intended for marine work, and in ship's equipment, etc.
In order to obtain a lubricant-free operation, frictional contact elements have already been proposed one of whose members consists of a compound material or a material impregnated with a synthetic resin, in particular polytetrafluoroethylene.
The member co-operating with the synthetic resin member is generally made from ordinary steel and the frictional contact element thus formed gives good results under normal working conditions But when this frictional contact element has to function in an oxidizing atmosphere or in water or mud, etc, precautions must be taken to avoid corrosion and jamming.
This has led to the provision of sealing joints with an initial protective lubrication, which means that one of the essential advantages of the lubricant-free contact element is lost Or again, the member may be made from stainless steel which is lPrice 4 s 6 d l expensive and whose mechanical properties 40 are sometimes inadequate Or again the rubbing steel component is covered with a protective layer of chrome, which is an expensive solution.
The object of this invention is to avoid 45 these complications and to provide directly a lubricant-free frictional contact element, which will stand up to the severest working conditions.
According to the invention there is pro 50 vided improvements in frictional contact elements for bearings, pivots and mechanical components, consisting of one part made wholly or partly of synthetic resin and one part made of a ferrous metal, the 55 latter part having been processed to acquire an interstitial solution of nitrogen in its surface layers, the surface solution of nitrogen being obtained by treating in a bath of melted nitrated salts, such as 60 cyanides and/or cyanates.
Frictional contact elements obtained in such a way have greatly improved frictional characteristics and a higher resistance to wear The group of frictional contact 65 elements is resistant to the weather, to sea-water and generally speaking to all corrosion agents.
The ferrous material forming one of the frictional contact elements may be steel or 70 cast-iron This element, treated in a bath of melted nitrated salts, may be used straight out of the bath without there being any need to subject it to a finishing treatment 75 The element formed by a synthetic resin may be a solid element entirely made of synthetic resin, or alternatively, a metal 971,355 element, e g bronze, coated with a layer of synthetic resin, such as polytetrafluorethylene, or phenol-plastic resin.
In current applications concerning a shaft rubbing against a bearing, the shaft would be made of steel, treated in a bath of nitrated salts, while the bearing would be synthetic resin.
EXAMPLE I
A device which is to be subjected twice per second to oscillations through 1800, includes a 40 mm diameter shaft, loaded to 2,000 k and supported by polytetrafluorethylene bearings The shaft is immersed in dirty water.
If the shaft is chromed, its useful life is 250 hours When treated in a bath of melted cyanide salts, its useful life is 600 hours.
EXAMPLE 2
Knuckle-joints on the steering-gear links of lorries which are to operate in the Sahara without lubricator consist of steel knuckles with phenol-plastic resin bearings With a non-treated steel the joints work for 30,000 km.
When the steel is treated in a bath of melted cyanide salts, satisfactory working is ensured for 80,000 km.
