Experiments to improve the silence of the 25 HP Synchro Mesh Gearbox helical trains.
| Identifier | ExFiles\Box 104\4\ scan0081 | |
| Date | 19th December 1931 | |
| COPY. X5310. BY. {R.W. Bailey - Chief Engineer} FROM DA. {Bernard Day - Chassis Design} DAL/M19.12.31. X5310 C. to SG. {Arthur F. Sidgreaves - MD} HS. {Lord Ernest Hives - Chair} RHC. {R. H. Coverley - Production Engineer} 25 HP. SYNCHRO MESH GEARBOX. ------------------------------------------- Herewith is N.sch.3396. shewing the following experi- ments, the object of which is to improve the silence of the helical trains: (1) Wider helical gears. (2) Finer pitch, namely, from 14 to 16 diametral pitch. (3) Slightly increase angle of helix. We understand we cannot grind an angle exceeding 35° therefore the suggestion to use 45° is probably not practi- cal {Mr Calvert} , but in any case it is only to be used as a last resort. 34° 35 mins, which is the nearest to 35° that we can get should however be tried. It will be noticed that the 3rd. speed driven wheel has had its bearing appreciably increased in length. DA. {Bernard Day - Chassis Design} | ||
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).