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).
Tests conducted to reduce noise and vibration from servo gears.
| Identifier | Morton\M20.3\ img032 | |
| Date | 27th June 1924 | |
| R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} WOR.{Arthur Wormald - General Works Manager} ORIGINAL Expl. No. 9910 REF Hs{Lord Ernest Hives - Chair}8/LG27.6.24. SECRET. NOISE FROM SERVO GEARS. We have a car running in which the worm reduction has been doubled and the reduction at the spur gears has been halved. The car fitted with this scheme is practically free from servo gear noise and vibration. There is no audible noise at all but there is still a slight feeling of vibration when light pressure is put on the servo. We consider that if we can reproduce the same degree of quietness on all cars, there should be no cause for complaint. We have carried out tests with the gearbox on the stand and find that we can reproduce the noise and vibration when the gearbox is driven by the electric motor which cuts out the possibility of vibration originating from the engine or propeller shaft. Tests are being made on the standard worm gears with - (1) Considerable slack - (2) Altered pitch. Hs.{Lord Ernest Hives - Chair} | ||