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).
Issues with the Goshawk 11 improved differential and suggesting material and design changes.
| Identifier | ExFiles\Box 49\2\ Scan085 | |
| Date | 19th May 1922 | |
| X.4256. To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to CJ. BY.{R.W. Bailey - Chief Engineer} Wor.{Arthur Wormald - General Works Manager} c. to Hy.{Tom Haldenby - Plant Engineer} EP.{G. Eric Platford - Chief Quality Engineer} R1/M/19.5.22. GOSHAWK 11. IMPROVED DIFFERENTIAL X.4256. The trouble with the differential crown wheel rolling teeth is almost certainly due to less than all 4 pinions taking load. It suggests;- (1) Uphardened pinions so that these can roll their teeth and equalise. (2) Slack bush to control crown wheel shaft so that this can move about and equalise. (3) More care in erection to ensure weight on all pinions, i.e. tight bushes for crown wheel shaft which should afterwards be eased to allow equalising. All these parts make as hard as is practical, but not brittle, but of more equal hardness, being certain that the crown wheels are the harder. Air hardening steel might be thought best. The driving shafts have been modified, having a large number of keys on the outside of the diameter in place of a small number of keys cut into the shaft. This obviously ought to have been done in the first instance so as to avoid the stress changes. R.{Sir Henry Royce} | ||