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).
Modifying the Phantom chassis servo reduction gear to reduce noise and improve performance.
| Identifier | ExFiles\Box 67\1\ scan0052 | |
| Date | 14th January 1927 | |
| Hs.{Lord Ernest Hives - Chair} X8370 Hs{Lord Ernest Hives - Chair} BY9/H.{Arthur M. Hanbury - Head Complaints} 14.1.27 RECEIVED JAN 15 1927 PHANTOM CHASSIS - SERVO REDUCTION GEAR. We have tried out half a dozen of the modified servo gears which I believe you tried a few of early on, namely, an increased worm reduction with almost equal ratio spur gears. The whole six we have tried out have given complete satisfaction, whereas we constantly have trouble from the basis of noise, with the present combination of small pinion and large wheel in the spurs. The gears are so near the ultimate interference point that we are constantly over-stepping the mark on one chassis or another, which causes continual discussion between ourselves and The Gear Grinding Company. If you will agree, I propose for D.2. to adopt the improved method of keeping the same reduction ratio, namely, more reduction in the worm gear and less in the spurs. BY.{R.W. Bailey - Chief Engineer} 9-1 Ratio Spur Gear Worm to suit | ||