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).
Comparison of bearing materials like Lead Bronze, white metals, and the Aluminium Tin range of alloys.
| Identifier | ExFiles\Box 115\5\ scan0217 | |
| Date | 6th December 1938 guessed | |
| 6. load capacity of Lead Bronze. Whilst high rubbing speeds and deflections encountered in some automobile engines are likely to induce scoring. We now realize that, although white metals are lowest in fatigue strength, they are highly satisfactory in many cases where the life is long enough for the im- posed conditions and cost is low. Again under, cor- rosive conditions any bearing containing corrodible lead should not be used. The ideal bearing material required is therefore one which could be utilized in practically all locations without regard to conditions imposed on the metal. It should have the fatigue resistance of copper-lead, the anti-friction of, say white metal, the bond and mechanical strength of silver, which has been used as a bearing material in the United States, and the ability to conform to deflection of crankshaft, retaining a high degree of embeddability and corrosion resistance at last equal to white metal. These conditions are entirely fulfilled by the Aluminium Tin range of materials. AC6, 7 and 9 developed some years ago by the Chemists of Rolls-Royce Ltd., for light alloy bearings. | ||