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 composition of rear axle differential washers.
| Identifier | ExFiles\Box 97\4\ scan0166 | |
| Date | 26th November 1938 | |
| 400B + 402. To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} c. Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls},6/MH.{M. Huckerby}26.11.38. REAR AXLE DIFFERENTIAL WASHERS. As you know we used in 8.B.V. rear axle in France, differential washers and bushes made in alum. bronze. We have been trying to get away from phosphor bronze because it is rapidly attacked by all except one Hypoid oil. Attempts to use AC.2 prove that the material is not strong enough. Alum. bronze has now been subjected to 100 hours on the dynamometer and a French test. The wear during both these runs was negligible, which is a state of affairs we have never before achieved, not even with oil which is least harmful to phosphor bronze. We recommend, therefore, that for Bentley V 'A' series alum. bronze washers are instructed on the L.O.P. This will have two advantages, firstly, slack will not develop so quickly; secondly, our customers will be able to run on 5 or 6 varieties of oil instead of one only, which is one not easily obtainable on the Continent. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||