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).
Analysis of oil pump drive and relief valve passages with a proposal to increase oil flow capacity.
| Identifier | ExFiles\Box 149\2\ scan0090 | |
| Date | 11th December 1934 | |
| -2- Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}4/KW.11.12.34. From the drawing the area between the oil pump drive and the surrounding casing appears rather small (.171 sq.in.) considering that the whole of the release has to pass through to gears and cross drive. The sectional areas in the relief valve are, (1) connecting passages .196 sq.in., (2) ball valve inserts .15 sq.in., and (3) .24 sq.in. past the ball valves in the fully lifted position. Other than by increasing areas throughout the relief valve and release oil passages in order to overcome the big variation in oil pressure, it could be carried out in the following manner. A spring controlled ball valve to release into the crankcase at 40 to 50 lbs/sq.in. and incorporated between the oil cooler matrix and the main bearing pressure valve, preventing excessive back pressure on the oil cooler matrix and facilitating the use of an increased pump capacity. Hs{Lord Ernest Hives - Chair}/L.M.Swindall. | ||