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).
Suggesting modifications to an epicyclic gear design to improve reliability and reduce risks.
| Identifier | WestWitteringFiles\C\January1919\ Scan6 | |
| Date | 11th January 1919 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. To EH. From R.{Sir Henry Royce} c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to BY.{R.W. Bailey - Chief Engineer} URGENT AND IMPORTANT ORIGINAL 11th. Jan.. 1919. R1/G11.1.19. RE EPICYCLIC GEAR. 3342✓ I believe that the annulus and larger planets can be made of high Brinell unhardened steel without shewing undue wear. This would enable us to get rid of some risks in this gearing. I understand we have demonstrated that it is absolutely necessary to harden the sun and smaller pinions, but that they are well rounded after carborising, to avoid the load falling on brittle and isolated corners of the teeth. I understand also that extra lubrication has enabled the planet roller bearing to last better. Most of these things have been embodied in the modified design, which should be subjected to the same conditions as is found most destructive to the present standard gear. If it is agreed that the above would make a very hopeful modification, I suggest that we put in hand 20 sets for use on important engines at once, together with friction anchorage. If this could be done in connection with other modifications in the engine, such as reduced compression; or modified ignition plugs, and the use of mixed fuel, the risk of trouble might be reduced by 80% or 90%. R.{Sir Henry Royce} | ||