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).
Secret memorandum detailing instructions and theory for modifying a 4-speed gearbox.
Identifier | ExFiles\Box 6\4\ 04-page050 | |
Date | 4th February 1925 | |
X.5310 To R.{Sir Henry Royce} from AJS. c. to CJ. BY.{R.W. Bailey - Chief Engineer} HS.{Lord Ernest Hives - Chair} S E C R E T. AJS1/M4.2.25. U. S. A.{Mr Adams} 4-SPEED GEARBOX. X.5310 Up to the present we have forwarded what we consider the minimum of instructions necessary for modifying parts of this box to make it O.K. These instructions are based on the result of experiments, and consist in the main of cleared away 1st. 2nd. and reverse forks, and stiffened reverse shaft. Since forwarding these instructions we have received HS{Lord Ernest Hives - Chair}4/LG29.1.25.. on the parallel reverse shaft experiment and ordinary uncleared away forks, but did not consider it worth while reverting to these forks at the moment. The parallel reverse shaft experiment appears to fit in with a theory as follows :- First assuming that the proportions of load and distance in the box for the reverse shaft is approximately SEE ORIGINAL FOR SKETCH. with these lengths and loads the BM. at X. & X.1. is the same therefore if shaft is parallel, the angle of deflection of shaft will be the same each end, and reverse will still slide out owing to a larger load at X.1. acting on same angle of inclined plane. ACTUALLY owing to L. being proportionally more than 3 units the greater inclination at X. appears to counterbalance the lesser force of W = 2. against W. = 3., and the greater inclination at this end, coupled with greater force will cause gear to slide out. This does not purport to be a complete theory. The original reason for reduced end of reverse shaft was that we wished to get plenty of metal under teeth on sleeve to prevent these tearing out, and also to fit a standard roller bearing. AJS. | ||