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).
Investigation into a groaning noise from the 40/50 gearbox when starting from a standstill.
| Identifier | ExFiles\Box 75\1\ scan0170 | |
| Date | 18th January 1923 | |
| Y3C426 c. to Hs.{Lord Ernest Hives - Chair} EP{G. Eric Platford - Chief Quality Engineer}/Mx{John H Maddocks - Chief Proving Officer}2/H18.1.23. 40/50. Gearbox We have always been somewhat in the dark regarding the cause of a groaning noise on the 40/50 chassis when starting from a standstill. This noise is heard on nearly every chassis when it is first moved under power, but in most cases is never heard again. On some chassis, however, the noise can be reproduced every time the chassis is moved, and we have just dealt with an exceptionally bad case of it on 20-TG, a finished car which has been returned with this complaint. We have located the cause to be due to the moving of the continuous gears on their shafts, which have a spline and taper fixing. Perhaps you will consider the question of the present limits on these parts, such as the amount of permissible slack on the splines and the amount of "draw" on the taper portion. It would appear that at present it is possible to have little or no "draw" on the taper portion and .002" slack on the splines. EP{G. Eric Platford - Chief Quality Engineer}/Mx.{John H Maddocks - Chief Proving Officer} [STAMP]: RECEIVED JAN 18 1923 | ||