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).
Gear face coefficient of friction tests to determine required end load on gearbox shafts.
| Identifier | ExFiles\Box 94\1\ scan0207 | |
| Date | 10th October 1935 | |
| X328 To Hdy.{William Hardy} c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell}3/KW.10.10.35. Gear Face Coefficient of Friction Tests. Herewith figures requested by Hdy.{William Hardy} to determine what end load is required on gearbox shafts to prevent rotational movement of the gears on their splines. A G.81578 SpectreCodename for Phantom III Reverse Shaft, having a hardened shaft, and two integral gears, was used for its convenience of adaption. This was secured in a vertical position. To G.81573 gear (bushed to fit the shaft) a torque arm was attached, the dead load being applied to this gear by means of a rod passing through the bore of the shaft. Two pairs of S/ZN washers, one pair hardened, and the other pair soft, diametrically similar to the face of the smaller integral gear, were produced, these washers being capable of turning relative to each other, but not relative to the gears. Using a dead load of 2030 lbs, the frictional torque was measured firstly with the surfaces well lubricated, and secondly with the surplus oil wiped off, with soft washers, the tests being repeated using the hardened washers. Area of contact = .7854 (2.125^2 - 1.250^2) = 2.315 sq." Mean Radius = .844" | ||