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).
Report comparing steering gear performance, discussing deflection, damping, and stiffness analysis.
| Identifier | ExFiles\Box 95\1\ scan0348 | |
| Date | 23th September 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}14/AW.23.9.36. Curve No.2 shows the actual load deflection diagrams obtained in practice with side steering tube springs. The comparison of the La{L. A. Archer} Salle gear with the R.R. gear is shown on curve No.1 in the form of spot readings. As the overall stiffness of the La{L. A. Archer} Salle gear as fitted to 30-EX was not measured, the spot readings are placed on the curve so that the wheel flap figure lies on the curve for the R.R. gear. The very close agreement of the joggle figure with the corresponding joggle curve for the R.R. gear suggests that this is justified. The experiments under heading (c) to investigate the effect of damping were carried out by taking a continuous record of wheel flap while the speed was falling through the critical range. This was repeated for various amounts and kinds of damping. The maximum value of the flap was then obtained from the record and is shown on curve No.3 plotted against governor pressure for the standard front dampers. Curve No.4 shows flap plotted against damping load per front road wheel, for both (a) the standard hydraulic dampers and (b) the same dampers at zero governor pressure with the addition of dry friction damping. Curve No.5 shows the theoretical characteristics of the standard front damper. This is exterpolated from 40 to 50 lbs/sq.in. governor pressure, and is used for constructing curve No.4. Some measurements of steering gear stiffness and overall steering system stiffness gave the following results. | ||