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).
Gear ratio alterations and alternatives for the Vulture rear axle.
| Identifier | ExFiles\Box 74\4\ scan0044 | |
| Date | 20th February 1920 | |
| X35248 To R from DA.{Bernard Day - Chassis Design} Copy to BH. [Struck through] Copy to CK.{Mr Clark} DA{Bernard Day - Chassis Design}12/CB20-2-20. 15 X.3873 RE VULTURE REAR AXLE. --------------------- With reference to Mr Elliott's E1/G12-2-20 we have altered "N" Scheme 49 to give a ratio of 4.72 to 1. This ratio is obtained on the drawing by using bevels 14 and 66 - 5 D.P. and only requires a increase in diameter to the casing of .1". The bevels on the Packard are 15 and 62, and on the drawing we have shewn that the load of our gears is less than that on the Packard. It is really rather less than the figures shewn because the Packard wheels were larger than we usually use. It is suggested that with the use of Gleason gears there would not be much objection to a pinion with 14 teeth; in fact it might be considered that if 4 pitch is more desirable than 5, wheels 11 and 52 giving 4.73 ratio might be used, the angle of the spiral being adapted to lap over one pitch. If these gears are not satisfactory, and it is desired to go not less than 15 teeth in the pinion, then wheels 15 and 71-ratio 4.73 might be used, which would increase the axle casing 1" in diameter. DA.{Bernard Day - Chassis Design} | ||