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).
Design of a reduction gear for a winch, including gear ratios and materials.
| Identifier | ExFiles\Box 175\2\ img146 | |
| Date | 22th July 1941 | |
| 2008 To Rm.{William Robotham - Chief Engineer} from Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} c.c. to Rm{William Robotham - Chief Engineer}/HH. Ev.{Ivan Evernden - coachwork} Ev{Ivan Evernden - coachwork}/Tla. Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}10/JH.22.7.41. Winch - Reduction Gear. PL.776 the original of which is attahhed to Rm{William Robotham - Chief Engineer}/HH's. copy shews the reduction gear between the engine and cable drum on the launching winch. Since there is some uncertainty as to the relative speeds and pulls which will prove most suitable for the purpose for which this winch will be required, we have provided three alternative gear ratios, the pinion, gear, and idler sizes being so arranged that the various gear centres are unaltered, whatever ratio is employed. The dimensions of the gear case are such that it will accommodate the largest gear required at any particular station. All three sets of gears should be detailed. In order to avoid the risk of gear distortion during case hardening, we have selected a material which is heat treated before machining and machined in the toughened state so that the necessity for grinding should be eliminated. Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} Original to Rm{William Robotham - Chief Engineer}/HH. Prints to Rm{William Robotham - Chief Engineer}/HH. Ev.{Ivan Evernden - coachwork} & Ashby. | ||