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).
Use of Textolite timing gears on a Bentley to reduce noise and production costs.
| Identifier | ExFiles\Box 136\1\ scan0109 | |
| Date | 26th October 1933 | |
| XUII To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} By.{R.W. Bailey - Chief Engineer} c. RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/KT.26.10.33. TIMING GEARS. Since adopting the balanced cam on the Bentley, tests have been carried out to see if it is possible to produce quiet gears straight from the machines without any hand bedding. Our experience is that Textolite gears are much easier to silence than metal gears. Apart from any other saving, the coarse pitch reduces the number of teeth to be cut. We think that in order to obtain full value from Textolite, we should make the water pump pinion in this material, we shall then have no two metal gears running together. We believe that the balanced cam will eliminate any fear of undue wear on the Textolite gear because Bentleys experience has shewn that they only ran into trouble when they adopted a quick lift camshaft. The balanced cam eliminates the peak torques which the cam wheel has to carry normally. We have been running the slipper wheel with independent damping to LeC.3602. We think that this will also greatly ease the condition under which the Textolite works. This slipper wheel does reduce rattles but does not enable us to get away without the balanced cam. Therefore, for the next 10,000 miles test, we should like to run a Textolite water pump pinion, and cam pinion, balanced cam, and slipper wheel to LeC.3602. We suggest cyanide hardening of the crank pinion and intermediate pinion as an additional means of reducing production costs without affecting efficiency. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||