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).
Testing the shock damper governor control, detailing issues with oil pressure and proposing modifications.
| Identifier | ExFiles\Box 179b\2\ img222 | |
| Date | 23th December 1932 | |
| ORIGINAL To Hdy.{William Hardy} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}1/KT. 23.12.32 X235 SHOCK DAMPER GOVERNOR CONTROL N. SCH. 3468. It was decided to isolate the pumping and governor controlling units to facilitate the investigation of the independent characteristics of each. The governor and valve were first dealt with. Oil was supplied by an independent gear pump to Point A.{Mr Adams} shewn on the attached sketch Hs.{Lord Ernest Hives - Chair}792, which is referred to as the governor release. It was at once apparent that it took considerably greater pressure to open the governor valve than to keep it open once the valve was lifted off its seat. It was therefore deduced that the oil did not escape past the piston sufficiently rapidly to prevent pressure building up there-on. To prove this the piston was removed and the rod run through to the ball (sketch B.) The figures in the respective conditions were as follows:- Road Speed M.P.H. | Gov: Speed R.P.M. | Piston + Rod. Initial. lb/sq.in | Piston + Rod. Final. lb/sq.in | Long Rod. Initial. lb/sq.in. | Long Rod. Final. lb/sq.in. 30 | 128 | 4 | 1 | 4 | 1 60 | 256 | 13 | 5 | 12 | 11 80 | 342 | 26 | 10 | 18 | 17 This more or less proved the point and N.sch. 3593, the modification from W.W. overcame the trouble. Replacing the piston to the original N.sch.3468 we coupled the independent oil supply to B. The results at once shewed that there was considerable restriction in the banjo connections between the pump and the governor. We have always found that banjo connections suffer from this fault. Increasing the size of the union (N.sch. 3593 already improves the top one), or providing a passage in the casting will overcome this trouble. We should prefer the latter. | ||