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).
New design proposal for shock dampers using small air vessels.
| Identifier | ExFiles\Box 16\4\ Scan131 | |
| Date | 13th December 1929 | |
| X7520 By.{R.W. Bailey - Chief Engineer} from Da.{Bernard Day - Chassis Design} c. Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} Da{Bernard Day - Chassis Design}2/M13.12.29. SHOCK DAMPERS. X.5520 X.7520 Herewith we send N.sch.2996/7. showing a suggestion for providing a small degree of free motion in the shock damper by means of small air vessels inside the pressure chambers. N.Sch.2996 shows what we suggest as a way of making a quick test on an existing damper and R.{Sir Henry Royce} would like this to be done at once. N.sch.2997 is intended for the purpose of taking out a patent, which should be done in the name of Mr. W.C.Hardy. With reference to the principle of this device we are aware that we have had air in the shock dampers before and have found it detrimental, but we suggest that the design of the valve with piston extension, shown on N.sch.2085 is probably very different as regards disposition of oil/plate compared with the new proposal. We see however that there is a possibility that the valves will oscillate with these air vessels. If so we suggest that the air release slot on the stem of the valve should be reduced to put in some damping. A narrower valve seat would also probably help. If neither of these is effective we can make some further suggestions for damping. If there is a hole drilled in the cylinder casing to the bottom of the valve stem it will be desirable to plug this up should valve oscillation develop. On Phantom II. front shock dampers it is known that there is a small quantity of air trapped on the high pressure side above the low pressure valve. Da.{Bernard Day - Chassis Design} | ||