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).
Test report on a Bentley III differential gearbox, detailing the effect of temperature on backlash and pre-load.
| Identifier | ExFiles\Box 99\4\ scan0151 | |
| Date | 13th September 1938 | |
| 428 To Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} from HPS{Horace Percy Smith - Experimental Factory Mgr}/W.Bell. HPS{Horace Percy Smith - Experimental Factory Mgr}/WB.{Mr Brazier/Mr Bell}2/CB.13.9.38. BENTLEY III DIFFERENTIAL GEAR BOX TESTS. P.D.41. Effect of Temperature on Back Lash and Pre-load. With the crownwheel locked, the backlash between it and the pinion - measured at 6" radius - was recorded at Shop temperature. Also the initial preload of the differential bearings was determined. These dimensions were remeasured after the temperature of the box had been increased to 100°C - by immersion in oil. Cold. Hot. Backlash .012 .009 Preload .003 Nil. HPS{Horace Percy Smith - Experimental Factory Mgr}/W. Bell. | ||