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).
Use and testing of helical gear oil pumps.
| Identifier | ExFiles\Box 159\6\ scan0006 | |
| Date | 19th January 1937 | |
| W Bell file ~~W.Bell~~ from Rm.{William Robotham - Chief Engineer} HPS.{Horace Percy Smith - Experimental Factory Mgr} Rm{William Robotham - Chief Engineer}/Smth. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}17/AP.19.1.37. OIL PUMPS. This memo is to confirm that the Helical gear pump LeC.4288 instructed in memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}7/AP.18.1.37. is now fitted in B.23.AE. Chassis B.15 Unit. Further to our memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}5/AP.24.12.36., will you please test out the effect of increasing the end clearance, also the radial clearance on the pump LeC.4288 (22° angle helix). We are asking for this on account of the fact that the Helical pumps vary in their characteristics, some give no trouble to enable to prime, and others take a considerable amount of trouble to obtain pressure. We are very anxious to know if the oil pump tests have gone far enough to give us the relative results obtained between the 22°, 10° and 5° Helical teeth as tried on the pump LeC.4288. The 22° angle pump will shortly be in production as the better of two evils compared with straight gears which are noisy. Does the 10° or 5° Helical pump combine the silent operation of the 22° and the flow efficiency of the straight gears ? Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||