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).
Two schemes to prevent the 3rd speed from working out of mesh on the Phantom III gearbox.
Identifier | ExFiles\Box 94\2\ scan0024 | |
Date | 8th September 1936 | |
C.E. pa.{Mr Paterson} RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Am. [Handwritten]: x3 [signature] E/HDY.{William Hardy}1/HP.8.9.36. Phantom III Gearbox. We send herewith N.Sch.4895 and N.Sch.4896 showing suggestions to prevent the 3rd speed from working out of mesh. The former scheme shews:- (1) An increase in the distance between the splines and the teeth on the sliding piece of .65" or 22%. (2) 14 1/2° pressure angle for the teeth instead of 20°, as what evidence we have points to high pressure angles being detrimental on teeth that have to accommodate movement without working out of mesh. (3) Increased flexibility of the 3rd motion shaft by means of a larger bore. The latter scheme shows how flexibility may be provided in the sliding piece with the object of permitting the .003 or so of movement at the gear end without movement on the splines. This scheme has the advantage that no alteration is required to any other piece than the sliding piece. A combination of 4895 and 4896 is, of course, likely to be still more effective. We have also moved the top gear teeth .2" forwards as we are told by the Gear Cutting section that the pointing of the teeth can be done provided this is not exceeded. N.Sch's 4895/6 herewith. E/HDY.{William Hardy} | ||