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).
Experiments with friction drives and various gear sets to reduce grinding effects and noise.
| Identifier | ExFiles\Box 75\1\ scan0049 | |
| Date | 5th February 1913 guessed | |
| -6- connected one of them by means of a friction drive only. You will see that the result of this would be to reduce to an extremely small amount the actual grinding effect of the flywheels, but I thought it would save the violent interchange of energy between the two flywheels. The friction drive would of course be inoperative if the tooth curves gave a constant velocity, but directly two teeth come into contact, the combined curves of which did not give a constant velocity, then the friction drive would operate and the grinding effect would be proportional to the amount of friction in the friction drive; the grinding would stop automatically and immediately the high place on the gear teeth was passed. Before abandoning the solid attachment of the gear wheels to the fly-wheels we tried another set of Brown & Sharpe standard gears from chassis 1926 which were very poor, but we had no success with these. We next tried a pair of 6 pitch gears cut on the Reinecker planer and corrected for interference and left soft; these gears had been put through some time ago but had never reached test. They were first of all tried soft in a standard box and were found to be very good, they were then hardened and were not passable. We ran them slowly in the rig with the slipper drive and using the fine grinding paste, and on removal from the rig they were found to have improved but could not be | ||