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).
Technical report on bearing lubrication modifications and Governor Control Scheme testing.
| Identifier | ExFiles\Box 105\3\ scan0282 | |
| Date | 18th October 1932 guessed | |
| -3- Attention was concentrated upon the H.P. results since it was known that deletion of the bearing vent sent the diagrams "in the air", but at each important stage of development L.P. diagrams were taken. It finally appeared that with the bearing went deleted it was necessary to make grooves in the piston .032" wide by .032" deep, and after running for approximately 10 minutes, the oil had penetrated to the bottom of the large diameter main bearing. It is possible by deleting only the small diameter bearing groove, the air vent problem will be overcome, whilst still permitting the oil under pressure to penetrate to the shaft, and by leaving the large bearing groove as designed, this bearing will be additionally lubricated by gravity feed pending the filling up of the shaft from the rear - to date it has not been possible to fully test this possibility. The effect of the Governor Control Scheme - N.S.3468 - was then proceeded with, this being controlled by a separate motor. Previously a curve showing the relation between Governor speed and the pressure developed had been taken with 'Lockheed' fluid, using .156" diameter pipes throughout. This curve approximated to the calculated speed - pressure relations shown on N.S.3468. Owing to inexperience with the effect of this fluid on the damper, and to avoid the possibility of it mixing with the Compressor oil in the damper, it was considered advisable to use Compressor oil as the external pressure medium. Totally different governor speed-pressure results were obtained, however, with .156" diameter pipes, and when tested in conjunction with the damper some very peculiar diagrams were obtained especially at the higher mean axle velocities both on long and short strokes. To avoid too much complication it was decided to confine the diagrams to Governor speeds equivalent to 30, 60, and 80 m.p.h. road speed, at 0.5 and 1.5 ft/sec axle velocities on the 1" stroke ( i.e. 180 and 540 flywheel r.p.m. respectively) and 0.5 and 2 ft/sec mean | ||