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).
Proposal to remedy an issue with the Phantom III gearbox 2nd speed coupling by applying a universal ring.
| Identifier | ExFiles\Box 94\2\ scan0011 | |
| Date | 15th May 1936 | |
| Handwritten: x328 GRY.{Shadwell Grylls} Can you follow this up & get it on test quickley E/HW.1/HP.15.5.36 Rm{William Robotham - Chief Engineer} Typed: C. [obscured] 14.5.36. HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} Phantom III - Gearbox. 2nd Speed Coupling. We send herewith N.Sch.4824 which shows a universal ring applied to the 2nd speed sliding piece with the object of preventing it working out of mesh. We think that this scheme will remedy the trouble and it should be tried in preference to the acme splines. The ring scheme also has the advantage of requiring no alteration to the shaft. As shown a new sliding piece is required, but for a quick trial an existing sliding piece may be used, provided that it is ground out to take a spring ring of larger diameter and ground in the bore concentric with the outside diameter. No more metal should be removed in the latter operation than is necessary to clean up the surfaces. The radius at the end of the bore must be reduced to .050 minus 25. The outside diameter of the inner piece will need to be made to suit the sliding piece when cleaned up in the bore. The splines of the inner piece should not be hardened as the load is well distributed over them, and there should not be any need for hardening. This does not apply to the shaft splines which should continue to be hardened. E/HDY.{William Hardy} N.Sch.4824 herewith. | ||