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).
Modifications to the Phantom III gearbox and propeller shaft coupling.
| Identifier | ExFiles\Box 94\1\ scan0234 | |
| Date | 12th November 1935 | |
| 4328 LE Smith BY.{R.W. Bailey - Chief Engineer} C. E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Da.{Bernard Day - Chassis Design} RHC.{R. H. Coverley - Production Engineer} HDY.{William Hardy}3/HP.12.11.35. Gearbox - Phantom 3. - Taper Mounting for the Propeller Shaft Coupling. We send herewith N. Sch.4691 which shows the above means of reducing the slack in the transmission. The same taper is used as at the rear end of the propeller shaft, but in the case of the gearbox end the gear thrust tends to push the coupling off the shaft. We have, therefore, given a torque to be applied when tightening the nut which will take care of both the gear thrust and the propeller shaft sliding joint friction. The rear bearing now bears directly on the shaft and is to be to Messrs. Hoffmann's drawing 41-469.J. with 8-17/32" balls. The bore to be 1.310 plus .0002, minus .0003. Outside diameter and width unaltered. Now that the withdrawal of the propeller shaft coupling does not leave the bearing loose on the shaft the assembling and dismantling of the casing is not quite as easily done as before. It is also necessary to slightly modify the casing as shown on N. Sch.4657 to compensate for this loss of freedom. No provision is made for the use of RR. type gears as we imagine that they will not be required by the time this scheme can be used. Slight alteration is made to scoop for the lubrication scheme to N. Sch.4685. The oil retaining screw thread has only one start and the piece on which it is need not be prevented from rotating relative to the shaft. HDY.{William Hardy} | ||