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).
Analysis of crankshaft torsional oscillations and spring drive mechanics.
| Identifier | ExFiles\Box 132\1\ scan0108 | |
| Date | 18th March 1939 guessed | |
| 2 But if the crankshaft undergoes an extra acceleration, upwards say in the views given, superimposed on the torsional oscillations, then contact between A and B will be broken. Thus, to cover all possible eventualities, the springs D and E would require to be extremely stiff; so stiff that trouble would probably be experienced due to the device ceasing to operate as a spring drive at all. A minor objection is that damping would be performed by rubbing on the accurate tooth profiles instead of on a suitable flat surface. In the normal type of spring drive, on the other hand, contact is maintained on driving side of gears for a large amplitude of crankshaft oscillation because the teeth are pressed together by the spring pressure due to a spring deflection = deflection due to steady driving torque - deflection due to crankshaft oscillation amplitude, not acceleration; (because springs are almost weightless). This is positive so long as camshaft friction is sufficiently high. G.S. Bower. | ||