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).
Design points and improvements for 40/50 water pumps.
| Identifier | WestWitteringFiles\R\January1928-March1928\ 3 | |
| Date | 9th January 1928 | |
| RM.{William Robotham - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} ORIGINAL E1/M9.1.28. C. to BJ. 40/50 WATER PUMPS. X8190 Y4590 Thank you for your memo. HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}2/LG9128., with information from your files on the above subject. Regarding the points you raise we are proceeding as follows:- FRICTION DRIVE. This is being replaced by a positive form of drive through a Hardy fabric coupling with splined hubs. The present coupling was made chiefly with a view to facilitating the removal of the water pump and bracket. LEAKAGE OF GLANDS. The Hardy coupling should be an improvement as regards accommodating manufacturing errors in the concentricity of the drive; moreover the spigot mounting of the pump should reduce this particular error to the minimum and prevent any alteration occurring due to a change of pumps. Regarding the present Phantom I believe it was originally intended that the water pump bracket should be bored in position on the crankchamber and remain with the parent casting always, only the pump body itself being changed. LUBRICATION OF GLAND. A drip plug is being used to replace the Stauffer for filling the annulus between the two glands with oil. The gradual leakage of the lubricant past the glands is the means of lubrication of the bearings. GLAND NUT LEAK. We cannot understand the necessity for locking the gland nut if the thread is made the same hand as the rotation. The 20HP. is not locked. We are making our new design with a plain nut but it will be easy to fit a wire lock ring if found necessary, although the ring will not be very accessible with the pump in position. WOODEN THRUST PIECE. We have not seen OY's remarks concerning this item, but our suggestion was to use chromium plated (not cadmium) faces for this work. GLANDLESS PUMP. The use of a spring loaded pump rotor with a flat or conical sealing face is worth considering either alone or in conjunction with a gland, but we should not feel very happy in applying the pressure by rubbing faces in the water. (1) | ||