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).
Investigation comparing the noise levels of spur, epicyclic, and internal (spool) gears for a silent 3rd speed gearbox.
| Identifier | WestWitteringFiles\T\March1929-December1929\ Scan313 | |
| Date | 24th December 1929 | |
| P.A. FROM DA.{Bernard Day - Chassis Design} Copy to SG.{Arthur F. Sidgreaves - MD} Copy to HS.{Lord Ernest Hives - Chair} DA{Bernard Day - Chassis Design}3/M24.12.29. x5310 x7310 y523 ORIGINAL SILENT 3rd. SPEED GEARBOX. Herewith we send N. sch. 3002. - an investigation of the comparative merits of spur, epicyclic, and internal (spool) gears, principally as regards noise. The investigation was originally undertaken due to an assertion that the quietness of internal (spool) gears is due to the speed of initial (sliding) engagement of the teeth being very much lower than in spur gears, and is not due to the greater number of teeth in engagement. We suggest that the merits of the epicyclic gear are broughtout, and also in a rather marked degree those of the spool gear. We have sent a print to R.{Sir Henry Royce} because we believe he will be interested, but for the moment we believe there is nothing Derby need do with the drawing except file it. LA.{L. A. Archer} | ||