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).
Material choices for hypoid gears, specifically manganese and aluminium bronze.
| Identifier | ExFiles\Box 136\5\ scan0139 | |
| Date | 22th November 1926 | |
| Y2066 BY2/H.22.11.26. R.{Sir Henry Royce} Cy. (R.R. of A.Inc) C. Hs.{Lord Ernest Hives - Chair} C. WOF. RECEIVED NOV 22 1926 HYPOID GEARS. I attach hereto copy of a memo received from Cy. on the above subject. You will notice that they are having some difficulty on this type of gear, which undoubtedly, from his remarks, is a fundamental question of material. It is obvious, of course, that a gear of this description approximates more closely to the worm than the bevel gear, so that sliding is materially increased on the hypoid gear as against the ordinary straight or spiral bevel. It might be possible to use a Manganese Bronze for the gear, the advantage of this being that it would give a very material increase of strength whilst it would bring in the new type of material, that is, a bronze, which would appear to be necessary for the increased sliding friction resulting from the hypoid design. I will make enquiries as to whether the makers of manganese bronze could produce forged blanks or worked blanks with a Tensile strength up to their ordinary figure of 40 to 45 tons. per square inch. If so, it would possibly be worth while obtaining some blanks and sending them across for cutting, if R.{Sir Henry Royce} is in agreement with the proposal in question. Aluminium bronze would of course be a further possibility. One is inclined to think that the ordinary Phosphor Bronze would be lacking in mechanical strength, otherwise it's qualities would be excellent. BY.{R.W. Bailey - Chief Engineer} By | ||