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).
Knock in the transmission and a proposed solution of making the driving shafts more elastic.
| Identifier | ExFiles\Box 49\1\ Scan213 | |
| Date | 30th August 1920 | |
| R.R. 199 (250T) (SD676 19-7-17) MP 18.865 x 3457 R4/G30.8.20. To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} Copy to CJ. " " Bn.{W.O. Bentley / Mr Barrington} " " Da.{Bernard Day - Chassis Design} " " Hs.{Lord Ernest Hives - Chair} " " EFC. " " PN.{Mr Northey} " " H.{Arthur M. Hanbury - Head Complaints} X.3923. " " EP.{G. Eric Platford - Chief Quality Engineer} X.4174. RE KNOCK IN TRANSMISSION. X.3457. Taking 6.EX as a bad specimen, it would be unwise to alter the transmission until we have endeavoured to reduce the cause of this knock when there is slack in the transmission. At the same time you might find out how much this slack is in this particular specimen. The way to reduce the tendency of this knock I suggest may be to make the driving shafts inside the axle more elastic. This can be done by getting a pair which are not bored up for lightness, and making them of equal or slightly less torsional strength, by reducing them on the outside diameter. If we adopt this we should take extreme care that the condition of the metal is as near as possible to that of a spring temper, and that the outside of the shaft is carefully ground so as to avoid any circular marks, the minimum dimensions being obtained by a slot taper at each end. This would, of course, considerably reduce the tendency to fracture, and give us the maximum flexibility in this shaft. We may hope by doing so, to reduce this particular phenomenon, and possibly increase the facility of changing gear, and also to reduce the tendency of sudden torsional stresses to destroy the tyres. It may have, however, various faults, such as Contd. | ||