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).
Technical note on gear teeth stresses and pitch line loading for various gearboxes.
Identifier | ExFiles\Box 123\3\ scan0179 | |
Date | 30th May 1934 | |
X4704 Hdy.{William Hardy} - This may interest you. Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}26/KW.30.5.34. Gear Teeth. In view of the failure of the Vulture 3rd speed driven gear, we have calculated the tooth stresses in this gear for several boxes. The results obtained are :- 40/50 74000 lbs/sq. " Bentley Std. 79000 " Bentley, Per. Box 10 D.P. 20º obliquity 79000 " Terraplane "8" 9 " 20º " 55000 " Vulture to N.Sch. 12 " 14½º " 131000 " " 10 " 20º " 100000 " " 10 " 25º " 89000 " SpectreCodename for Phantom III (350 lbs/ft.) 10 " 20º " 70000 " Since the clutch is able to transmit twice engine torque, these figures will be doubled when the clutch is let in at the wrong speed until the flywheel has been accelerated to the correct engine speed. Another trouble we have on highly stressed gearboxes is failure of the surface of the 1st speed gears. The pitch line loading for various boxes is :- 40/50 6100 lbs/in. Bentley Peregrine 5500 " Terraplane "8" 7400 " Vulture 3700 " Bentley Std. 3700 " | ||