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).
Epicyclic gear information, charts, ratios, and special applications.
| Identifier | ExFiles\Box 178\2\ img049 | |
| Date | 12th October 1940 | |
| Serial No 21 On page 3 Oy 10/10/Mr 12 40 same problems as helical, since the actual bedding lines do not stay straight after quenching due to twist or tapering of the gear in quenching. 4. Epicyclic in RR After resurrecting some of my epicyclic information from the dim recesses of twenty five years ago, I don't think Olind Chilton is doing anything but staving off the inevitable with his 24 pinion gear described in the right form report. The attached chart (which is now so complete that I cannot understand it myself) shows that if we look upon Chilton's single pinions of 1'9" annulus dia eter as being the practical low limit, he is excluded from the range of ratio between 9/16 and 7/16, and to get the latter he has to turn the whole gear back to front and drive the sunwheel with a fixed annulus. If he wants to invade the whole field between .400 and .600 ratio with a gear design of uniform type, he will have to use a compound planet gear similar to the old eagle falcon, or else go to the 'don't' for bevel epicyclics. The reason I am interested is because G.M. are work-ing on epicyclics in some special applications of the Allison, and have asked me some questions about them. OK | ||