From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Patent specification for improvements to upper cylinder lubricants.
Identifier | ExFiles\Box 145\3\ scan0148 | |
Date | 3rd April 1936 | |
1235 or 124 @Rinblay PATENT SPECIFICATION 460,345 Application Date: April 3, 1936. No. 9929/36. Complete Specification Accepted: Jan. 26, 1937. COMPLETE SPECIFICATION Improvements relating to Upper Cylinder Lubricants We, ALEXANDER DUCKHAM, a British subject, of Duckham House, 16, Cannon Street, London, E.C.4, and ALEXANDER DUCKHAM & COMPANY LIMITED, a Company registered under the laws of Great Britain, of 16, Cannon Street, London, E.C.4, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:— The invention relates to lubricating substances or compositions which are suitable for use as upper cylinder lubricants for internal combustion engines. Solid or semi-solid lubricants, such as those containing waxes and/or naphthalene have been added to the fuel of internal combustion engines for the purpose of effecting lubrication of the cylinder walls, piston rings, valves and valve stems. In some cases, for example where the tank of a motor car is not in use for some time after the introduction of lubricants of the above nature, particularly if the temperature is near that of the freezing point of water, solution may be slow, and there may be an undesirable concentration of material at the bottom of the fuel tank. It is the object of the invention to provide a lubricating substance or composition for addition to liquid fuels, which will dissolve in the fuels of internal combustion engines and which will be free from any tendency to cause the collection of such relatively concentrated solutions of the substance or composition at the bottom of the fuel containers. The invention consists in a solid or semi-solid upper cylinder lubricant which is completely soluble in motor fuel and has a lower apparent density than that of the motor fuel due to incorporation in the mass of small gaseous or vaporous inclusions. The invention also consists in the method of forming a solid or semi-solid upper cylinder lubricant which will float upon the motor fuel and is completely soluble therein which consists in incorporating in the mass small gaseous or vaporous inclusions. If the mass has an apparent density of about 0.7, it will float in petrol and other internal combustion engine fuels. The lubricant of the invention will remain floating in motor fuel into which it is introduced until solution is substantially complete, the more concentrated solution forming about the material descending into the body of the fuel substantially as rapidly as it forms by virtue of its greater density, and becoming dispersed throughout the bulk of the fluid. The lubricant of the invention may be formed from any suitable substances or compositions which are soluble in motor fuels and have the desired lubricating action. Suitable additions may be made to the materials to render them more easily moulded and/or to modify their solubility, consistency or lubricating properties. The material may comprise a mineral wax or a non-mineral wax or a mixture of these. A desirable composition which may be employed is one comprising a mineral wax and a non-mineral wax in admixture in such proportions as to have a setting range of 100°F.{Mr Friese} to 150°F.{Mr Friese} Suitable mineral waxes are paraffin and ceresin wax, whilst the non-mineral or natural waxes comprise those having a sufficiently high degree of solubility in the motor fuels commonly employed. In some mixtures the addition of an aromatic hydrocarbon, for example, naphthalene, and/or anthracene, may conveniently be made to facilitate solution of the whole mixture, 5 to 10% being convenient quantities. Other suitable compositions which may be employed as lubricants are solidified oils prepared by usual, well-recognised methods, such as by the addition of aluminium stearate or oleate to oils. In carrying the invention into effect in the production of a solid upper cylinder lubricant, two to three parts of mineral wax and one part of a beeswax are melted together, with the addition of naphthalene if desired, in a vessel capable of withstanding pressure and fitted with means for extending the contents through a suitable relief valve. Gas at a pressure which may be, for example, 60lbs. per square inch is introduced into the vessel, carbon-dioxide being a suitable gas. The molten wax mixture having absorbed a quantity [Price 1/-] Matthews - | ||