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).
Pulley materials and their effect on crankshaft and camshaft critical speed.
| Identifier | ExFiles\Box 132\2\ scan0215 | |
| Date | 12th June 1941 | |
| -cont'd- - 2 - Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}1/SW.12.6.41. 2. (cont'd) Aluminium is reported to be a quite unsatisfactory pulley material on account of wear, but there is some hope that a pulley of laminated plastic material might prove successful. Alternatively, the pulley might be rubber insulated from the damper, always bearing in mind the fact that it may have to transmit 16 H.P. ------------ It seems fairly certain that with a crankshaft pinion keyed directly to the crankshaft, the cam wheel and camshaft must have some effect on the critical speed. Owing to the uncertain effect of backlash and torsional bending of the camshaft itself, this effect has not been considered in the above calculations. It may therefore be that the figures which we have quoted for the Humber type damper, are not as bad as they should be. Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden} JAS. | ||