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).
Suggestion for the B.V. and B.50 gearbox, detailing changes to cone and cam angles to prevent a pressed-on cone from coming off.
| Identifier | ExFiles\Box 136\2\ scan0078 | |
| Date | 17th April 1939 | |
| BY/MS c. Rm.{William Robotham - Chief Engineer} 1153 DA.{Bernard Day - Chassis Design}3/G.17.4.39. B.V. and B.50 GEAR BOX. Gry{Shadwell Grylls} Please receive herewith FD.{Frank Dodd - Bodies}420 2nd. Speed Cone Solid with gear. This is a suggestion to deal with the trouble of a pressed on cone having come off. The additional effort is 20% on the overdrive ratios and 10% on the standard ratios. But the effort on the overdrive ratio with a given cone diameter is less than on the standard ratios. The cone angle is unchanged at 8º and the cam angle increased from 55º to 60º. Should the effort be too great 7º cone angle could be tried with a 55º cam angle. Alternatively, there are ways of fixing the large diameter separate cones, which would prevent them actually coming off, but it is suggested we should try the scheme out as a FD.{Frank Dodd - Bodies}420 to begin with. MS for LOP meeting 4152 GSS DA.{Bernard Day - Chassis Design} Gry{Shadwell Grylls} | ||