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).
Outlining the design and rationale for fitting rubber bushes and pads to the Phantom III rear springs.
| Identifier | ExFiles\Box 95\2\ scan0013 | |
| Date | 23th January 1936 | |
| X346 BY.{R.W. Bailey - Chief Engineer} c. H.Hs.{Lord Ernest Hives - Chair} Hdy.{William Hardy} RHC.{R. H. Coverley - Production Engineer} Phantom III Rear Springs. To reduce tyre noise we wish to fit rubber bushes to the rear springs on Phantom III, and also a rubber pad between the rear springs and the axle. LeC.4897 shews the front end bushes of the Cadillac type and LeC.4928 those at the rear end. In the latter case it is the top bush of the shackle which is rubber, the lower one remaining as now, also following Cadillac practice. In this case lubrication is supplied to the lower bush from the spring. To overcome the steering difficulties which have hitherto been experienced with rubber bushes in the rear springs, we have lowered the front end of the spring with reference to the rear end, and the new front bracket and rear dumb iron are shewn on LeC.4897 and LeC.4928 respectively. The rubber pads for the spring are shown on LeC.4927, which also shews the layout of the springs and the modification to the spring lubrication necessitated by the use of rubber bushes. LeC.4936 shews the lubrication to the R.H. spring and also the flexible pipe for the hydraulic jacks. LeC.4897 shews a solid eye to the front end of rear spring, and this is what we prefer. Should there be any difficulty in getting this large eye solid, we have prepared LeC.4939 showing a rolled eye with the end of the plate carried on and riveted for additional support, also, in case the Cadillac type bushes shewn on LeC.4928 should give too great flexibility to the lateral control we have made LeC.4942 shewing a silent bloc bush both top and bottom of the rear shackle, having less rubber in each than the Cadillac type. It is not intended that this should be used unless the Cadillac type proves unsatisfactory. Da.{Bernard Day - Chassis Design} | ||